Piezomagnetic oil level gauge and oil-immersed transformer

Abstract

The invention discloses a piezomagnetic oil level gauge and an oil-immersed transformer, the piezomagnetic oil level gauge comprises an oil level gauge body, a magnetic detector and an oil cleaning mechanism, and the oil cleaning mechanism comprises a driving part, a lifting transmission assembly, a rotating transmission assembly and a cleaning assembly. A driving part of the oil cleaning mechanism is fixedly connected to the oil level gauge body, the power output end of the driving part is in transmission connection with a lifting transmission assembly of the oil cleaning mechanism, one end of the lifting transmission assembly is in transmission connection with a support, and the lifting transmission assembly is in linkage with the support of the cleaning assembly and drives the first cleaning component to move upwards. When the magnetic detector is located in the first containing space of the first cleaning part, the driving part drives the rotary transmission assembly to be in linkage with the first cleaning part to rotate and clean along the outer wall face of the magnetic detector, and it is guaranteed that the outer wall face of the magnetic detector is clean and less greasy dirt exists. The magnetic signal transmission of the magnetic detector is stable, and the self weight of the magnetic detector is basically kept unchanged, so that the position precision of the magnetic detector during detection is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil level detection, in particular to a piezoresistive oil level gauge which can be applied to an oil-immersed transformer. Background Art

[0002] Transformers are widely used in power supply and distribution systems in industrial enterprises and residential buildings. Their primary function is to reduce the high-voltage network voltage to the 230V / 400V busbar voltage used by users. Oil-immersed transformers, a type of transformer, use petroleum-based transformer oil as an insulating and cooling medium. Due to its natural abundance and low price, oil-immersed transformers are widely used.

[0003] The body of an oil-immersed transformer (windings and core) is housed in a tank filled with transformer oil, constructed from welded steel plates. The oil tanks of medium and small transformers consist of a shell and a lid. The transformer body is placed within the shell, and the lid can be opened to lift the body out for inspection. Due to the structure of the oil-immersed transformer, the oil level cannot be directly observed visually. Therefore, an oil level gauge is required to monitor the oil level in the transformer and obtain accurate oil level parameters, ensuring more continuous and stable operation.

[0004] In the existing technology, the piezoresistive oil level gauge detects the oil level height through magnetic signals. However, due to the presence of a large amount of oil medium inside the oil-immersed transformer, the outer wall of the magnetic detector of the piezoresistive oil level gauge is often adhered to by the oil medium while detecting the oil level. The adhesion of the oil medium not only weakens the transmission of the magnetic signal, but also changes the weight of the magnetic detector itself, resulting in low position accuracy when detecting the magnetic detector.

[0005] For example, patent document CN2938042Y, a prior art publication, discloses a piezoresistive oil level gauge for transformer oil conservators. In this scheme, a magnetic float is installed within a float chamber that moves with the transformer oil level within the chamber. When the magnetic float moves with the transformer oil within the float chamber to the same position as the magnetic rotor, the permanent magnet within the magnetic float causes the magnetic rotor to flip 180 degrees. The red surface displayed indicates the position of the magnetic float, which is also higher than the level of the transformer oil within the housing connected to it. Because the magnetic float in this scheme is directly immersed in the transformer oil within the float chamber, a large amount of oil will inevitably adhere to the surface of the magnetic float. This is especially true for magnetic floats that have been used for a long time, which can lead to even greater amounts of oil adhering to the surface. This large amount of oil adhering to the magnetic float weakens the magnetic signal between the magnetic float and the magnetic rotor, and also changes the weight of the magnetic float itself, which in turn affects the operator's ability to monitor the oil level using the magnetic float.

[0006] Therefore, when the magnetic detector in the prior art is used for a long time, oil will adhere to its surface, which will affect the transmission of the magnetic signal on the one hand; on the other hand, it will increase the weight of the magnetic detector, thereby leading to low position accuracy when detecting the magnetic detector. Summary of the Invention

[0007] The purpose of the present invention is to solve the problem in the prior art that when a magnetic detector is used for a long time, oil stains will adhere to its surface, which will affect the transmission of magnetic signals on the one hand; on the other hand, it will increase the weight of the magnetic detector, thereby resulting in low position accuracy when detecting the magnetic detector.

[0008] In order to solve the above problems, an embodiment of the present invention provides a piezoresistive oil level gauge, including an oil level gauge body and a magnetic detector, the magnetic detector is located below the oil level gauge body and is movably connected to the oil level gauge body; it also includes an oil cleaning mechanism, the oil cleaning mechanism includes: a driving member, the driving member is fixedly connected to the oil level gauge body.

[0009] A lifting transmission assembly, one end of the lifting transmission assembly is transmission-connected to the power output end of the driving member, and the other end extends at least to the bottom of the magnetic detector, and the magnetic detector is slidingly connected to the lifting transmission assembly.

[0010] The rotary transmission assembly is located on one side of the lifting transmission assembly, and one end of the rotary transmission assembly is transmission-connected to the power output end of the driving member, and the other end extends at least to the bottom of the magnetic detector.

[0011] The cleaning assembly includes a support and a first cleaning component rotatably connected to the support. The support is transmission-connected to the other end of the lifting transmission assembly, and in the initial state, the support is located at the lowest end of the lifting transmission assembly; the first cleaning component is transmission-connected to the other end of the rotating transmission assembly.

[0012] The first cleaning component is located directly below the magnetic detector and has a first storage space for accommodating the magnetic detector. When the lifting transmission assembly is linked to the support to drive the first cleaning component to move upward, the magnetic detector is stored in the first storage space, and the rotating transmission assembly is linked to the first cleaning component to rotate along the outer wall surface of the magnetic detector.

[0013] Using the above-mentioned technical solution, the present invention provides a piezoresistive oil level gauge comprising an oil level gauge body and a magnetic detector, which detects the height of the oil level via magnetic signals. The piezoresistive oil level gauge also includes an oil cleaning mechanism, which comprises a drive member, a lifting transmission assembly, a rotary transmission assembly, and a cleaning assembly. The drive member is fixedly connected to the oil level gauge body and drives the lifting transmission assembly to and fro via the power output. The lifting transmission assembly is in turn connected to the support of the cleaning assembly, meaning that the drive member can be linked to the lifting of the support, and the lifting and lowering movement of the support drives the lifting and lowering movement of the magnetic detector. A first cleaning component, linked to the rotary transmission assembly, is used to clean the oil medium attached to the surface of the magnetic detector when the support pushes the magnetic detector.

[0014] When a magnetic detector is immersed in an oily medium, its outer surface comes into contact with the oil, and the oil adheres to its surface. This is especially true with prolonged use, as the oil accumulates on its surface. The first cleaning component rotates to remove the oil from the outer surface of the magnetic detector. This clean, oil-free surface not only ensures the stability of the magnetic signal transmission, but also keeps the weight of the magnetic detector essentially constant, thereby improving the positional accuracy of the magnetic detector during testing.

[0015] In addition, the first cleaning component is located directly below the magnetic detector. The first storage space of the first cleaning component can not only store and clean the magnetic detector, but also store the magnetic detector when it is not working, thereby protecting the magnetic detector and increasing the service life of the magnetic detector.

[0016] Therefore, the magnetic pressure oil level gauge provided by the present invention drives the lifting transmission component of the oil cleaning mechanism through the driving part to drive the lifting and lowering movement of the support. When moving to the magnetic detector, the rotating transmission component is linked to the first cleaning component to clean the oil and other impurities on the surface of the magnetic detector. After cleaning, the magnetic signal transmission of the magnetic detector is more stable, and the magnetic signal strength is effectively improved, making the position detection of the magnetic detector more accurate.

[0017] According to the piezoresistive oil level gauge provided in an embodiment of the present invention, the cleaning assembly also includes a second cleaning component adapted to the first cleaning component. The second cleaning component is rotatably connected to the oil level gauge body and is located directly above the magnetic detector, and the power output end of the driving member is transmission-connected to the second cleaning component through an intermediate transmission assembly to link the second cleaning component to rotate.

[0018] Furthermore, the second cleaning member has a second storage space for storing the magnetic detector, and the second storage space is disposed opposite to the first storage space.

[0019] Using the above technical solution, the second cleaning component of the cleaning assembly is used to clean impurities such as oil stains on the surface of the magnetic detector. Specifically, the second cleaning component is arranged on the oil level gauge body and is located directly above the magnetic detector, so as to clean impurities such as oil stains on the surface of the magnetic detector close to one side; while the first cleaning component is located directly below the magnetic detector, so as to clean the surface of the other side of the magnetic detector. After contacting the magnetic detector, the first cleaning component and the second cleaning component clean the outer wall surface of the entire magnetic detector. The cleaning area is sufficient, the cleaning efficiency is improved, and the magnetic signal of the magnetic detector is ensured to be stable and not interfered with by oil stains. The weight of the magnetic detector itself also remains basically unchanged, thereby improving the position accuracy when detecting the magnetic detector.

[0020] Furthermore, the second cleaning component has a second storage space arranged opposite to the first storage space. The structures of the first storage space and the second storage space are close to or consistent with the shape of the magnetic detector. When the first storage space and the second storage space are close to each other, the entire magnetic detector can be stored.

[0021] The piezoresistive oil level gauge provided according to an embodiment of the present invention further includes a guide component, which is arranged in a vertical direction and is located on a side of the rotary transmission assembly away from the lifting transmission assembly.

[0022] In addition, the support is movably sleeved on the guide component. When the driving member drives the lifting transmission assembly to drive one end of the support to move along the lifting transmission assembly, the other end of the support sleeved on the guide component moves synchronously along the guide component.

[0023] With the above technical solution, the guide component, on the one hand, provides a guiding function for the support: the guide component is arranged in the vertical direction, and the support is movably sleeved on the guide component, so that when the support moves along the lifting transmission component under the drive of the lifting assembly, the other end of the support sleeved on the guide component moves synchronously along the guide component; on the other hand, the guide component realizes the horizontal limit of the support, preventing the support from shaking when the two ends of the support move along the lifting transmission component and the rotation transmission component respectively, thereby improving the stability of the support and further ensuring the stability of the support when pushing the magnetic detector. When the cleaning component is cleaning a stable magnetic detector, the efficiency and effect of cleaning the oil stains on the outer wall of the magnetic detector will be effectively improved, thereby improving the position accuracy when detecting the magnetic detector.

[0024] According to the magnetic pressure oil level gauge provided in an embodiment of the present invention, the lifting transmission assembly includes a screw rod, one end of which is fixedly connected to the output shaft of the driving member, and the other end extends in a vertical direction. A threaded hole adapted to the screw rod is formed at one end of the support, and the support cooperates with the screw rod through the threaded hole.

[0025] In addition, connecting rods are fixedly connected to both sides of the magnetic detector. One end of the magnetic detector is movably sleeved on the screw rod, and the other end is movably sleeved on the guide component.

[0026] With the above technical solution, the lifting transmission assembly includes a screw, which can effectively transmit motion. The driving member provides power for the entire piezoresistive oil level gauge. The power provided is transmitted to the screw through the output shaft of the driving member, thereby realizing the rotation of the screw. The other end of the screw cooperates with the threaded hole on the support to meet the requirements of screw rotation. Connecting rods are fixedly connected on both sides of the magnetic detector. During movement, the magnetic detector maintains synchronous movement with the connecting rods on both sides; and the two sides of the magnetic detector are movably mounted on the screw and the guide component respectively. Under the driving action of the driving member, both sides of the magnetic detector maintain synchronous movement with the screw and the guide component. The movement process is natural and unobstructed, realizing the detection of different oil levels of the transformer by the magnetic detector.

[0027] According to the piezoresistive oil level gauge provided in an embodiment of the present invention, the rotating transmission assembly includes a long gear, one end of the long gear is engaged with the output shaft teeth of the driving member through the gear, the outer peripheral wall of the first cleaning component is provided with teeth adapted to the long gear, and the other end of the long gear extends at least to the first cleaning component in the vertical direction and is engaged with the outer peripheral wall teeth of the first cleaning component.

[0028] With this technical solution, the output shaft of the driver drives the long gear through gear meshing, achieving force and motion transmission. The long gear itself is long enough that its other end meshes with the outer peripheral wall of the first cleaning member through a gear connection, indirectly transmitting the motion of the output shaft of the driver to the first cleaning member. The rotation of the first cleaning member also drives the rotation of the first cleaning member, ultimately cleaning the outer wall of the magnetic detector from oil stains.

[0029] According to the piezoresistive oil level gauge provided in the embodiment of the present invention, the first cleaning component includes a circular rotating member and a first cleaning disk embedded in the circular rotating member, and the first receiving space is formed in the first cleaning disk.

[0030] Furthermore, teeth matching the long gear are formed on the outer wall of the circular rotating member. The circular rotating member meshes with the long gear through the teeth. The long gear sequentially drives the circular rotating member and the first cleaning disk to rotate relative to the magnetic detector.

[0031] Using this technical solution, the long gear drives the circular rotating member through its teeth, achieving motion transmission. The circular rotating member of the first cleaning component includes a first cleaning disc embedded within the circular rotating member. When the long gear sequentially drives the circular rotating member and the first cleaning disc to rotate, the first cleaning disc cleans impurities such as oil from the surface of the magnetic detector. The first storage space formed in the first cleaning disc is used to store the magnetic detector.

[0032] According to the piezoresistive oil level gauge provided in an embodiment of the present invention, the first receiving space is hemispherical, and a plurality of elastic cleaning strips are arranged at intervals along the circumference of the inner wall surface of the first receiving space, and a first clamping member is formed on the end surface of the first cleaning disk.

[0033] With this technical solution, the hemispherical shape of the first storage space facilitates accommodating a portion of the magnetic detector. Multiple elastic cleaning strips on the inner wall of the first storage space clean the magnetic detector. These strips are spaced circumferentially along the inner wall of the first storage space, ensuring comprehensive and efficient cleaning of the magnetic detector, significantly improving cleaning efficiency. A first retaining member formed on the end surface of the first cleaning tray is used to secure the magnetic detector when not in use.

[0034] According to the piezoresistive oil level gauge provided in the embodiment of the present invention, the second cleaning component includes a second cleaning disk, and the second receiving space is formed in the second cleaning disk.

[0035] Furthermore, a second clamping piece adapted to the first clamping piece is formed on the end surface of the second cleaning disc, and the second cleaning disc is transmission-connected to the power output end of the driving member through an intermediate transmission assembly.

[0036] With the above technical solution, the driving member drives the intermediate transmission assembly through its own power output end, thereby driving the rotation of the second cleaning disc. The rotating second cleaning disc ultimately cleans the magnetic detector, and the second storage space formed in the second cleaning disc serves to store the magnetic detector. A second clamping member formed on the end surface of the second cleaning disc and adapted to the first clamping member is used to clamp the magnetic detector. When the first clamping member and the second clamping member are clamped, the first storage space of the first cleaning disc and the second storage space of the second cleaning disc jointly form a space for accommodating the magnetic detector, thereby achieving stable storage of the magnetic detector and protecting the magnetic detector.

[0037] The piezoresistive oil level gauge provided according to an embodiment of the present invention further includes a storage assembly, which is arranged on the oil level gauge body at one end away from the first cleaning component; the storage assembly includes a storage bin, a protective cover, and a convex hook.

[0038] The inner wall of the storage bin is movably connected to the outer wall of the protective cover, a convex hook is connected to the outer wall of the end of the protective cover away from the first cleaning component, and the convex hook is fixedly connected to the protective cover.

[0039] By adopting the above technical solution, the storage bin of the storage assembly can store the protective cover, and the inner wall of the storage bin is movably connected to the outer wall of the protective cover. When the protective cover is not in use, the protective cover can be stored in the storage bin to save space and store it safely. When the protective cover is in use, the protective cover can be taken out of the storage bin and firmly connected to the first cleaning disk through the convex hook on the protective cover, so as to realize the protective effect of the protective cover on the magnetic detector and increase the service life of the magnetic detector.

[0040] Furthermore, the protective cover protects the magnetic detector while preventing the magnetic detector from reacting with the external environment when it contacts the oil medium, such as possibly oxidizing the oil medium and changing the weight or structure of the magnetic detector itself.

[0041] The piezoresistive oil level gauge provided in accordance with an embodiment of the present invention includes an oil tank, wherein the oil tank is filled with transformer oil, and the piezoresistive oil level gauge is arranged inside the oil tank.

[0042] With this technical solution, the oil tank, as part of the oil-immersed transformer and its outer shell, primarily bears the transformer's weight while also storing oil and dissipating heat. The transformer oil in the tank protects the insulation, reduces temperature, and provides fire protection. A piezoresistive oil level gauge, installed inside the transformer tank, monitors the oil level, ensuring stable and efficient operation of the transformer.

[0043] The beneficial effects of the present invention are:

[0044] The present invention provides a piezoresistive oil level gauge and an oil-immersed transformer, comprising an oil level gauge body and a magnetic detector. The magnetic detector detects the oil level of the oil-immersed transformer. The oil level gauge also includes an oil cleaning mechanism, wherein a driving member of the oil cleaning mechanism is fixed to the oil level gauge body and provides power for the entire oil level gauge body. The power provided by the output end of the driving member is transmitted to a lifting transmission assembly, thereby driving the lifting and lowering motion of the lifting transmission assembly. The lifting transmission assembly, in conjunction with the support of the cleaning assembly, drives a first cleaning component upward. At this time, the rotating transmission assembly, driven by the driving member, links with the first cleaning component to rotate along the outer wall of the magnetic detector, thereby cleaning the magnetic detector. After cleaning, the magnetic detector has a neat appearance, and the magnetic signal transmission is more stable and efficient. The weight of the magnetic detector itself remains essentially unchanged, thereby improving the position accuracy when detecting the magnetic detector.

[0045] Furthermore, the first cleaning component is positioned directly below the magnetic detector, ensuring full contact between the first cleaning component and the magnetic detector after movement. When the first cleaning component works in conjunction with the second cleaning component located directly above the magnetic detector, the cleaning efficiency of the magnetic detector is effectively improved. The first storage space within the first cleaning component securely and stably accommodates the magnetic detector, preventing it from interacting with the external environment.

[0046] Therefore, when detecting the oil level, the piezoresistive oil level gauge provided by the present invention uses the first cleaning component to clean the oil stains and other impurities on the surface of the magnetic detector, thereby ensuring that the surface of the magnetic detector is clean and tidy, and the weight of the magnetic detector itself remains basically unchanged, thereby effectively improving the position accuracy when detecting the magnetic detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 A schematic structural diagram of an oil level gauge body, a magnetic detector, and an oil cleaning mechanism of a piezoresistive oil level gauge provided in an embodiment of the present invention;

[0048] Figure 2 A schematic structural diagram of an oil level gauge body and an oil cleaning mechanism of a piezoresistive oil level gauge provided in an embodiment of the present invention;

[0049] Figure 3 A schematic structural diagram of the intermediate transmission assembly, the second cleaning component, and the storage assembly of the piezoresistive oil level gauge provided in an embodiment of the present invention;

[0050] Figure 4 A schematic structural diagram of a protective cover of a piezoresistive oil level gauge provided in an embodiment of the present invention;

[0051] Figure 5 A schematic structural diagram of a first cleaning component of a piezoresistive oil level gauge provided by an embodiment of the present invention;

[0052] Figure 6 A schematic structural diagram of a first cleaning disk of a piezoresistive oil level gauge provided in an embodiment of the present invention.

[0053] Description of reference numerals:

[0054] 1. Oil level gauge body;

[0055] 10. Storage components;

[0056] 11. Storage bin; 12. Protective cover; 13. Convex hook; 2. Magnetic detector;

[0057] 20. The outer wall of the magnetic detector;

[0058] 3. Oil cleaning mechanism;

[0059] 30. Driving parts;

[0060] 31. Lifting transmission assembly;

[0061] 310, screw;

[0062] 32. Rotary transmission assembly;

[0063] 320, long gear;

[0064] 33. Cleaning components;

[0065] 34. Support;

[0066] 340, threaded hole;

[0067] 35. A first cleaning component;

[0068] 350, the outer peripheral wall of the first cleaning member;

[0069] 360, first cleaning plate;

[0070] 361, first holder;

[0071] 370, circular rotating member;

[0072] 371. The outer wall of a circular rotating component;

[0073] 380, first storage space;

[0074] 381, elastic cleaning strip;

[0075] 39. Second cleaning component;

[0076] 391, second cleaning tray;

[0077] 392, second holder;

[0078] 393, second storage space;

[0079] 4. Intermediate transmission components;

[0080] 5. Guide components;

[0081] 6. Connecting rod. DETAILED DESCRIPTION

[0082] Transformers, essential equipment for power transmission and distribution, utilize the principle of electromagnetic induction to change AC voltage. They are widely used in industries such as industry, agriculture, and transportation. Transformers are categorized by their intended use, including oil-immersed transformers, distribution transformers, and combined transformers. Because the transformer oil in oil-immersed transformers provides insulation and cooling, it improves transformer efficiency and service life. Therefore, oil-immersed transformers are highly favored by buyers.

[0083] A normal oil level in an oil-immersed transformer is an effective guarantee for its safe and stable operation. If the oil level is too high or too low, it will cause certain damage to the transformer and even cause the transformer to malfunction. Therefore, in the actual operation of oil-immersed transformers, it is necessary to design an oil level detection device or structure to remind the operator to take action and prevent transformer failure.

[0084] The piezoresistive oil level gauge is a device that uses magnetic force to detect the oil level in the transformer tank. The following is a detailed introduction to its working principle.

[0085] Working principle:

[0086] The magnetic sensor uses magnetism to measure the oil level. As the float in the sensor rises and falls with the oil level, the displacement of the sensor is transmitted to the magnetic receiver or sensor head via magnetic signals, thereby detecting the oil level.

[0087] Most common oil-immersed transformers have an oil level gauge to detect changes in the oil level. In some existing solutions, since the magnetic detector is often immersed in an oil medium, a layer of oil often adheres to the surface of the magnetic detector. Especially when the magnetic detector is used for a long time, the oil attached to the surface of the magnetic detector will affect the transmission of the magnetic field because the magnetic permeability of the oil medium is lower than that of air, and the strength of the magnetic field will affect the working efficiency of the transformer. In addition, since the oil medium has weak conductivity, it will form an electric field in the transformer, which will affect the magnetic field and thus affect the transmission of the magnetic signal. On the other hand, it will increase the weight of the magnetic detector, resulting in low position accuracy when detecting the magnetic detector.

[0088] To address the above technical issues, the present invention provides a piezoresistive oil level gauge applicable to oil-immersed transformers. A lifting transmission assembly in the oil cleaning mechanism drives a first cleaning component to move up and down, while a rotating transmission assembly simultaneously drives the first cleaning component to rotate along the outer wall of a magnetic detector. When the first cleaning component moves to contact the magnetic detector, the rotating first cleaning component cleans the oil impurities on the surface of the magnetic detector, allowing the oil impurities adhering to the outer wall of the magnetic detector to separate from the magnetic detector. The clean and uncontaminated magnetic detector can efficiently and stably transmit magnetic signals, thereby accurately detecting the position of the magnetic detector.

[0089] In order to more clearly understand the piezoresistive oil level gauge provided in the present application, the structure of the piezoresistive oil level gauge is described in detail below with reference to the accompanying drawings.

[0090] See Figure 1 and Figure 6 This piezoresistive oil level gauge includes an oil level gauge body 1, a magnetic detector 2, and an oil cleaning mechanism 3. The oil cleaning mechanism 3 includes a driver 30, a lifting transmission assembly 31, a rotational transmission assembly 32, and a cleaning assembly 33. The driver 30 is fixedly connected to the oil level gauge body 1. One end of the lifting transmission assembly 31 is drivingly connected to the power output end of the driver 30, and the other end extends at least below the magnetic detector 2. The magnetic detector 2 is slidably connected to the lifting transmission assembly 31.

[0091] The rotating transmission assembly 32 is located on one side of the lifting transmission assembly 31 , and one end of the rotating transmission assembly 32 is transmission-connected to the power output end of the driving member 30 , and the other end extends at least to the bottom of the magnetic detector 2 .

[0092] The cleaning assembly 33 includes a support 34 and a first cleaning component 35 rotatably connected to the support 34. The support 34 is transmission-connected to the other end of the lifting transmission assembly 31, and in the initial state, the support 34 is located at the lowest end of the lifting transmission assembly 31; the first cleaning component 35 is transmission-connected to the other end of the rotating transmission assembly 32.

[0093] The first cleaning component 35 is located directly below the magnetic detector 2 and has a first storage space 380 for accommodating the magnetic detector 2. When the lifting transmission assembly 31 links the support 34 to drive the first cleaning component 35 to move upward, the magnetic detector 2 is stored in the first storage space 380, and the rotating transmission assembly 32 links the first cleaning component 35 to rotate along the outer wall surface 20 of the magnetic detector.

[0094] In the present invention, a piezoresistive oil level gauge cleans the outer surface 20 of the magnetic detector via a first cleaning component 35 and a second cleaning component 39. The oil cleaning mechanism 3 of the piezoresistive oil level gauge comprises a driver 30, a lifting transmission assembly 31, a rotating transmission assembly 32, and a cleaning assembly 33. The driver 30 provides power for cleaning the piezoresistive oil level gauge, indirectly driving the lifting transmission assembly 31 to cause a support 34 to reciprocate on the lifting transmission assembly 31. The support 34 is rotatably connected to the first cleaning component 35. When the driver 30 drives the support 34 to reciprocate, it also drives the first cleaning component 35, which is rotatably connected to the support 34, to reciprocate. When the first cleaning component 35 approaches and contacts the magnetic detector 2, the rotating transmission assembly 32, driven by the driver 30, also causes the first cleaning component 35 to rotate along the outer surface 20 of the magnetic detector, thereby cleaning any oily impurities adhering to the outer surface 20 of the magnetic detector and ensuring a clean and contaminated surface.

[0095] Furthermore, the lifting transmission assembly 31 drives the first cleaning component 35 to reciprocate along its axial direction, facilitating cleaning based on the real-time position of the magnetic detector 2. The rotating transmission assembly 32, through its teeth, drives the first cleaning component 35 to rotate along its own axis, cleaning impurities such as oil and dirt from the surface of the magnetic detector 2. This axial movement of the lifting transmission assembly 31 and the rotational movement of the first cleaning component 35 enable cleaning of magnetic detector 2 at different locations, ensuring that oil and dirt on the surface of the magnetic detector 2 are fully removed. This ensures more efficient and stable transmission of magnetic signals from the magnetic detector 2. Furthermore, since there is minimal, or even no, oil and dirt attached to the surface of the magnetic detector 2 after cleaning, the weight of the magnetic detector 2 remains essentially unchanged, thereby improving the positional accuracy of the magnetic detector 2 during detection.

[0096] Furthermore, by detecting the height displacement of the magnetic detector 2 at different oil levels, the detected displacement change is transmitted to the signal receiving end or signal processing end in the form of a magnetic signal, thereby obtaining the accurate position accuracy of the magnetic detector 2 in a timely manner.

[0097] The structure of the piezoresistive oil level gauge is explained in detail below.

[0098] The structure of the piezoresistive oil level gauge is not limited and can be a regular frame shape or other irregular shapes.

[0099] In one embodiment, the piezoresistive oil level gauge is configured as a frame-like regular shape consisting of main structures such as the oil level gauge body 1, the magnetic detector 2, and the oil cleaning mechanism 3, and can clean the magnetic detector 2 through reciprocating movement.

[0100] In another embodiment, the piezoresistive oil level gauge is configured as other irregular structures consisting of main structures such as the oil level gauge body, the magnetic detector, and the oil cleaning mechanism, and can also be moved to clean oil and other impurities on the surface of the magnetic detector.

[0101] It should be noted that the piezoresistive oil level gauge is ultimately installed in the oil tank of the oil-immersed transformer. In addition to meeting the requirements of detecting the oil level height through magnetic signals and the cleaning effect of the oil cleaning mechanism 3 on the magnetic detector 2 through movement, the structure of the piezoresistive oil level gauge must be able to be placed in the oil tank of the oil-immersed transformer and be able to save space.

[0102] Based on the two implementation methods of the above-mentioned magnetic pressure oil level gauge, please refer to Figure 1 and Figure 2 , the piezoresistive oil level gauge includes a cleaning mechanism 3.

[0103] The structure and arrangement of the cleaning mechanism 3 are not limited, and it can be a structure that achieves cleaning through a thread and gear transmission method, or a structure that achieves cleaning through a chain transmission method.

[0104] In one embodiment, the cleaning mechanism 3 drives the lifting transmission assembly 31 through the driving member 30 to link the support 34 of the cleaning assembly 33 to drive the first cleaning component 35 to move upward, wherein the lifting transmission assembly 31 includes a screw rod 310, and the screw rod 310 cooperates with the threaded hole 340 formed at one end of the support 34 to realize the transmission of force and motion from the screw rod 310 to the support 34. That is, the screw rod 310 drives the support 34 to move back and forth along the screw rod 310, and at the same time, the support 34 links the reciprocating movement of the first cleaning component 35 that is rotatably connected to the support 34. The driving member 30 drives the rotary transmission assembly 32 to rotate the first cleaning member 35 along the outer wall surface 20 of the magnetic detector. The rotary transmission assembly 32 includes a long gear 320. One end of the long gear 320 meshes with the output gear of the driving member 30, and the other end of the long gear 320 also meshes with the teeth on the outer peripheral wall 350 of the first cleaning member. Ultimately, the force and motion of the driving member 30 are transmitted to the long gear 320, thereby driving the rotation of the first cleaning member 35. After the first cleaning member 35 contacts the outer wall surface 20 of the magnetic detector, the rotation of the first cleaning member 35 drives oil and dirt impurities on the outer wall surface 20 of the magnetic detector to separate from the magnetic detector 2, thereby cleaning the outer wall surface 20 of the magnetic detector and ensuring that the magnetic detector 2 transmits magnetic signals stably and efficiently.

[0105] In another embodiment, the cleaning structure can be a structure that drives the support to move back and forth by means of a long chain reciprocating movement. In short, the long chain transmission method is used to replace the screw transmission method, and the support can also be driven to move back and forth up and down by the driving member and to link the reciprocating movement of the first cleaning component connected to the support rotation. The rotating transmission assembly can drive the rotation of the first cleaning component and realize the cleaning of the oil stains on the outer wall of the magnetic detector.

[0106] It should be noted that the axial dimensions of the lifting transmission assembly 31 and the rotating transmission assembly 32 must ensure that the first cleaning component 35 can adequately clean the oil and impurities on the outer wall surface 20 of the magnetic detector. In this embodiment, the lifting transmission assembly 31 and the rotating transmission assembly 32 extend to the magnetic detector 2 or below the magnetic detector 2 to ensure that the magnetic detector 2 can move along the lifting transmission assembly 31. Because excessively long or short axial dimensions of the lifting transmission assembly 31 and the rotating transmission assembly 32 will affect the cleaning effect and efficiency, this embodiment does not impose specific limitations on the specific dimensional values.

[0107] For example, the axial dimensions of the lifting transmission assembly 31 and the rotating transmission assembly 32 extending to the driving member 30 are 3 cm to 10 cm larger than the axial dimension of the magnetic detector 2 from the driving member 30. If the linear dimension of the magnetic detector from one end of the driving member 30 is 18 cm, the axial dimensions of the lifting transmission assembly 31 and the rotating transmission assembly 32 from the driving member 30 can be set to 21 cm, 22 cm, 23 cm, etc.

[0108] Further, see Figure 1 , the two sides of the magnetic detector 2 are fixedly connected with a connecting rod 6, one end of the magnetic detector 2 is movably mounted on the screw rod 310, and the other end is also movably mounted on the guide component 5. The movably arranged manner of both ends of the magnetic detector 2 facilitates the magnetic detector 2 to detect the oil level, and when the driving member 30 drives the screw rod 310 to rotate, the screw rod 310 drives the support 34 and pushes the magnetic detector 2 to reciprocate along the screw rod 310.

[0109] It should be noted that, with regard to the specific structure of the magnetic detector 2, in one embodiment, the magnetic detector 2 is set as a magnetic detection ball; according to the actual oil level detection requirements, the structure of the magnetic detector 2 can also be set to other structures that are easy to clean, and this embodiment does not make specific limitations on this.

[0110] Further, see Figure 1 、 Figure 5 as well as Figure 6 The cleaning assembly 3 of the cleaning mechanism includes a support 34 and a first cleaning component 35, wherein the first cleaning component 35 includes a circular rotating member 370 and a first cleaning disk 360 embedded in the circular rotating member 370, and the outer wall surface 371 of the circular rotating member is provided with teeth that cooperate with the long gear 320. The long gear 320 is linked to the rotation of the circular rotating member 370 and the first cleaning disk 360 relative to the magnetic detector 2 through tooth transmission. While the first cleaning disk 360 rotates, it cleans the oil stains on the outer wall surface 20 of the magnetic detector.

[0111] The structure of the first cleaning plate 360 ​​is not limited, and may be a hemispherical structure or a U-shaped fork structure.

[0112] In one embodiment, the first cleaning disc 360 is configured as a hemispherical structure having a first receiving space 380 therein. This hemispherical structure can be close to or coincide with, and can accommodate, the magnetic detector 2. This allows for full contact with the magnetic detector 2 by being closer to the magnetic detector 2, and effectively removes oil stains adhering to the outer wall surface 20 of the magnetic detector as the hemispherical structure rotates. The removal of oil media is achieved by a plurality of elastic cleaning strips 381 spaced apart within the first receiving space 380. As the first cleaning disc 360 rotates, the plurality of elastic cleaning strips 381 circumferentially disposed on the inner wall surface of the first receiving space 380 repeatedly rub against the oil stains, removing them from the magnetic detector 2, thereby ensuring a clean outer wall surface 20 of the magnetic detector.

[0113] In another embodiment, the first cleaning disk is configured as a U-shaped fork structure, with the forks being hollowed out, i.e., the forks are spaced apart, wherein an elastic cleaning strip is provided on the inner side of the U-shaped fork, and the long gear links the circular rotating member and the U-shaped fork to rotate relative to the magnetic detector, and the elastic cleaning strip on the U-shaped fork cleans the oil stains on the outer wall of the magnetic detector while rotating. In short, in this embodiment, the hemispherical structure in the first embodiment is configured as a hollow structure with a U-shaped fork in the circumference. When the U-shaped fork rotates, the U-shaped fork presents a hemispherical profile with an open end, and its interior is also regarded as having a first storage space for storing the magnetic detector.

[0114] Further, see Figures 1 to 3 The cleaning component 33 also includes a second cleaning component 39 that cooperates with the first cleaning component 35. The second cleaning component 39 is located directly above the magnetic detector 2, and the aforementioned first cleaning component 35 is located directly below the magnetic detector 2. When the first cleaning component 35 pushes the magnetic detector 2 to move and contact the second cleaning component 39, the first storage space 380 of the first cleaning component 35 and the second storage space 393 of the second cleaning component 39 both store the magnetic detector 2 in the space facing each other.

[0115] For further information, see Figures 1 to 3 The second cleaning member 39 is rotatably connected to the oil level gauge body 1. Similar to the first cleaning member 35, the second cleaning member 39 also rotates to clean oil contaminants. Specifically, the power output end of the driver 30 drives the intermediate transmission assembly 4, which in turn rotates the second cleaning member 39. A second cleaning disc 391 within the second cleaning member 39 rotates to clean oil contaminants from the outer wall 20 of the magnetic detector.

[0116] The structure of the second cleaning plate 391 is not limited, and can be a hemispherical structure or a U-shaped fork structure.

[0117] In one embodiment, the second cleaning disc 391 is configured as a hemispherical structure, and the power output end of the driving member 30 drives the intermediate transmission assembly 4 and then drives the rotation of the hemispherical structure. The hemispherical structure cleans the oil stains attached to the magnetic detector 2 while rotating, and this structure corresponds to the hemispherical structure of the first cleaning disc 360, which facilitates the use of the first cleaning disc 360 and the second cleaning disc 391 to improve the cleaning effect of the magnetic detector 2.

[0118] In another embodiment, the second cleaning disc is configured as a U-shaped fork structure, which is a fork structure arranged at circumferential intervals, with the forks being hollowed out. When the circular rotating member drives the U-shaped fork to rotate, the rotating outline of the U-shaped fork is also hemispherical, and a second storage space for accommodating a magnetic detector is formed inside the U-shaped fork.

[0119] It should be noted that since the second cleaning disk 391 and the first cleaning disk 360 are both used to clean the oil stains on the outer wall surface 20 of the magnetic detector, the first cleaning disk 360 and the second cleaning disk 391 can be used to clean at the same time, or they can be used to clean the magnetic detector 2 individually. As for the specific cleaning combination method, as long as it meets the actual oil stain cleaning needs, this embodiment does not make any specific restrictions on this.

[0120] It should be noted that, for the rotation direction of the first cleaning disc 360 and the second cleaning disc 391, in order to improve the cleaning effect, the rotation directions of the first cleaning disc 360 and the second cleaning disc 391 can be set to opposite directions; at the same time, the rotation directions of the first cleaning disc 360 and the second cleaning disc 391 can also be set to the same direction according to actual cleaning needs. The specific direction selection can be determined according to actual cleaning needs, and this embodiment does not make specific limitations on this.

[0121] It should be noted that the intermediate transmission component 4 is a transmission structure arranged between the output end of the driving member 30 and the second cleaning component 39, and acts as a bridge to transmit the movement of the driving member 30 to the second cleaning component 39. The specific structure and setting method of the intermediate transmission component 4 can be a transmission structure and setting method such as belt drive, gear drive or chain drive. This embodiment does not make specific restrictions on the specific structure and setting method.

[0122] Further, see Figure 1 ,as well as Figures 4 to 6 A first clamping member 361 is formed on the end surface of the first cleaning disk 360, and a second clamping member 392 is formed on the end surface of the second cleaning disk 391 to cooperate with the first clamping member 361. Both the first clamping member 361 and the second clamping member 392 stabilize the magnetic detector 2 through the clamping effect.

[0123] Further, see Figure 1The guide component 5 on the piezoresistive oil level gauge is arranged on the side away from the lifting transmission assembly 31 in the vertical direction, and the support 34 is movably mounted on the guide component 5. When the driving member 30 drives the lifting transmission assembly 31 to drive the support 34 to move along the lifting transmission assembly 31, the guide component 5 guides the support 34 to ensure that both ends of the support 34 move synchronously along the lifting transmission assembly 31 and the guide component 5, thereby greatly improving the movement efficiency of the support 34.

[0124] It should be noted that the specific structure of the guide component 5 is set as a rod-shaped structure in this embodiment. According to the guiding function of the guide component 5, the guide component 5 can also be set as other guiding structures, and this embodiment does not make specific limitations on this.

[0125] Further, see Figure 1 as well as Figure 3 The piezoresistive oil level gauge also includes a storage assembly disposed on the oil level gauge body 1, wherein the storage assembly further comprises a storage bin 11, a protective cover 12, and a convex hook 13. The storage bin 11 is used to store the protective cover 12. The protective cover 12, together with the convex hook 13 fixedly connected to its outer wall, can be removed from the storage bin 11 and snapped onto the outer wall of the first cleaning disk 360 to protect the magnetic detector 2. At this time, the magnetic detector 2 is in an inoperative state.

[0126] It should be noted that the protective cover 12 is used to stabilize and protect the magnetic detector 2. The specific structure of the protective cover 12 can be set to a structure that is close to or consistent with the magnetic detector 2 and can accommodate the magnetic detector 2, such as a hemispherical shape with a storage space; the protective cover 12 can also be set to other structures that can accommodate and protect the magnetic detector 2. This embodiment does not make any specific restrictions on the specific structure of the protective cover 12.

[0127] Further, see Figure 1 The present invention also provides an oil-immersed transformer with a piezoresistive oil level gauge installed in the oil tank of the oil-immersed transformer to detect the oil level within the tank. This piezoresistive oil level gauge detects the oil level using a magnetic signal. The magnetic signal transmits the height displacement of the magnetic detector 2 to a signal receiving or processing terminal, providing real-time oil level parameters.

[0128] The present invention provides a piezoresistive oil level gauge, please continue to refer to Figure 1The oil level is detected by the magnetic detector 2. During use, the magnetic detector 2 is placed in an oil-immersed transformer, and the area surrounding the magnetic detector 2 is filled with an oil medium. The driving member 30 drives the lifting transmission assembly 31, and drives the first cleaning component 35 connected to the support 34 to move along the driving lifting transmission assembly 31. At the same time, the driving member 30 drives the first cleaning component 35 to rotate itself through a gear transmission. The rotating first cleaning component 35 cleans the oil on the outer wall surface 20 of the magnetic detector. The present invention also provides a second cleaning component 39 disposed opposite the first cleaning component 35. When the second cleaning component 39 contacts the magnetic detector 2, they cooperate to clean the oil on the surface of the magnetic detector 2 by rotation. This ensures stable and efficient transmission of the magnetic signal of the magnetic detector 2, and the weight of the magnetic detector 2 itself remains essentially unchanged, thereby improving the position accuracy when detecting the magnetic detector 2.

[0129] Although the present invention has been illustrated and described with reference to certain preferred embodiments thereof, it should be understood by those skilled in the art that the above description is provided as a further detailed description of the present invention in conjunction with specific embodiments thereof, and that the specific implementation of the present invention is not limited to these descriptions. Those skilled in the art may make various changes in form and details, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A piezomagnetic oil level gauge, comprising an oil level gauge body and a magnetic detector, wherein the magnetic detector is located below the oil level gauge body and is movably connected to the oil level gauge body; characterized in that: It also includes an oil cleaning mechanism, which includes: A driving member, the driving member is fixedly connected to the oil level gauge body; A lifting transmission assembly, one end of which is drivingly connected to the power output end of the driving member, and the other end of which extends at least to below the magnetic detector, and the magnetic detector is slidably connected to the lifting transmission assembly; A rotating transmission assembly, the rotating transmission assembly is located on one side of the lifting transmission assembly, one end of the rotating transmission assembly is drivingly connected to the power output end of the driving member, and the other end of the rotating transmission assembly extends at least to below the magnetic detector; A cleaning assembly, the cleaning assembly comprising a support and a first cleaning component rotatably connected to the support, the support is transmission-connected to the other end of the lifting transmission assembly, and in an initial state, the support is located at the lowest end of the lifting transmission assembly; the first cleaning component is transmission-connected to the other end of the rotating transmission assembly; and, The first cleaning component is located directly below the magnetic detector and has a first storage space for accommodating the magnetic detector. When the lifting transmission assembly links the support to drive the first cleaning component to move upward, the magnetic detector is stored in the first storage space, and the rotating transmission assembly links the first cleaning component to rotate along the outer wall surface of the magnetic detector.

2. The piezomagnetic oil level gauge according to claim 1, characterized in that: The cleaning assembly further includes a second cleaning component adapted to the first cleaning component, the second cleaning component being rotatably connected to the oil level gauge body and located directly above the magnetic detector, and the power output end of the driving member is transmission-connected to the second cleaning component through an intermediate transmission component to link the second cleaning component to rotate; and, The second cleaning member has a second storage space for storing the magnetic force detector, and the second storage space is disposed opposite to the first storage space.

3. The piezomagnetic oil level gauge according to claim 2, characterized in that: It also includes a guide component, which is arranged in a vertical direction and is located on a side of the rotating transmission component away from the lifting transmission component; and The support is movably sleeved on the guide component. When the driving member drives the lifting transmission assembly to drive one end of the support to move along the lifting transmission assembly, the other end of the support sleeved on the guide component moves along the guide component synchronously.

4. The piezomagnetic oil level gauge according to claim 3, characterized in that: The lifting transmission assembly includes a screw rod, one end of which is fixedly connected to the output shaft of the driving member, and the other end of which extends in the vertical direction. A threaded hole adapted to the screw rod is formed at one end of the support, and the support cooperates with the screw rod through the threaded hole; and The two sides of the magnetic detector are fixedly connected with connecting rods. One end of the magnetic detector is freely movably sleeved on the lead screw, and the other end is freely movably sleeved on the guide component.

5. The piezomagnetic oil level gauge according to claim 4, characterized in that: The rotary transmission assembly includes a long gear, one end of which is meshed with the output shaft teeth of the driving member through a gear, the outer peripheral wall of the first cleaning component is provided with teeth adapted to the long gear, and the other end of the long gear extends at least to the first cleaning component in the vertical direction and is meshed with the outer peripheral wall teeth of the first cleaning component.

6. The piezomagnetic oil level gauge according to claim 5, characterized in that: The first cleaning component includes a circular rotating member and a first cleaning disk embedded in the circular rotating member, the first receiving space is formed in the first cleaning disk; and The outer wall surface of the circular rotating member is formed with teeth adapted to the long gear, and the circular rotating member is meshed with the long gear through the teeth. The long gear sequentially drives the circular rotating member and the first cleaning disk to rotate relative to the magnetic detector for cleaning.

7. The piezomagnetic oil level gauge according to claim 6, characterized in that: The first receiving space is hemispherical, and a plurality of elastic cleaning strips are arranged at intervals along the circumference of the inner wall surface of the first receiving space, and a first clamping piece is formed on the end surface of the first cleaning disk.

8. The piezomagnetic oil level gauge according to claim 7, characterized in that: The second cleaning component includes a second cleaning plate, the second receiving space is formed in the second cleaning plate; and, A second clamping piece matched with the first clamping piece is formed on the end surface of the second cleaning disc, and the second cleaning disc is transmission-connected to the power output end of the driving member through the intermediate transmission assembly.

9. The piezomagnetic oil level gauge according to any one of claims 1 to 8, characterized in that: It also includes a storage component, which is arranged on the oil level gauge body at one end away from the first cleaning component; The storage assembly includes a storage bin, a protective cover, and a convex hook; wherein, The inner wall of the storage bin is movably connected to the outer wall of the protective cover, the convex hook is connected to the outer wall of the end of the protective cover away from the first cleaning component, and the convex hook is fixedly connected to the protective cover.

10. An oil-immersed transformer, comprising an oil tank, characterized in that: It also includes the piezomagnetic oil level gauge according to any one of claims 1 to 9; wherein: The oil tank is filled with transformer oil, and the magnetic-pressure oil level gauge is arranged inside the oil tank.

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