A transformer insulating oil filtering device

Abstract

The utility model discloses a transformer insulating oil filtering device relates to vacuum oil filter technical field, including work table, heating module and filter module. Heating module includes first stand, flow guide pipe, U -shaped tube and electric heating rod, and first stand partial insertion is in the flow guide pipe inner chamber, and electric heating rod is placed in the flow guide pipe inner chamber and is arranged with the coaxial setting of flow guide pipe, and the both ends of electric heating rod are connected with two first stand respectively. The insulating oil can realize multiple, fast heating when flowing in several heating rods in turn, and when electric heating rod from the middle part carries out heating to the insulating oil of the uniform wall thickness cylindrical shape, has the problem of heating uniform, high efficiency and reducing the unnecessary loss of heat. Several flow guide pipes are vertically equidistant linear array shape setting, and first stand and flow guide pipe are open character shape connection simultaneously, and therefore heating module has smaller width, and heating module and work table have smaller floor area, and the utility model discloses can be in the narrow space of test site mobile shuttle.

Description

Technical Field

[0001] This utility model relates to the field of vacuum oil filter technology, specifically to a transformer insulating oil filtration device. Background Technology

[0002] The insulating oil in a transformer typically serves functions such as insulation, cooling, arc suppression, and maintenance. Over time, impurities (such as particles and flocculent matter) can accumulate in the insulating oil, necessitating filtration to prevent malfunctions.

[0003] Insulating oil has poor fluidity, so it usually needs to be preheated (heating temperature is generally between 40 and 70 degrees Celsius) to improve filtration efficiency. Operators often need to carry filtration equipment to the site to drain and filter the insulating oil. Transformers are sometimes installed in cramped distribution rooms, making it difficult for traditional large-volume heating tanks to move quickly within confined spaces. Self-heating filters (i.e., those with a heating structure installed on the filter housing) suffer from heating delay (i.e., the insulating oil fails to reach the preset temperature when it flows to the filter structure, specifically due to insufficient heating efficiency). Summary of the Invention

[0004] In order to overcome the problem that "traditional insulating oil filtration technology cannot simultaneously achieve rapid heating and small size" in the above-mentioned background technology, this utility model provides a transformer insulating oil filtration device.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is:

[0006] A transformer insulating oil filtration device includes a workbench, a heating module, and a filtering module; both the heating module and the filtering module are mounted above the workbench; the heating module and the filtering module are connected via an oil supply pipe; the heating module includes a first column, a guide pipe, a U-shaped pipe, a first oil inlet pipe, a first oil outlet pipe, and an electric heating rod; the first column and the guide pipe are connected in an open shape, and the guide pipe and the U-shaped pipe are connected in an S-shape; the first column is partially inserted into the inner cavity of the guide pipe, and the electric heating rod is placed inside the inner cavity of the guide pipe. It is coaxially arranged with the flow guide tube; there are two first columns, and the two ends of the electric heating rod are respectively connected to the two first columns; the first column has a hollow structure with a sealed top and an open bottom, and the end of the electric heating rod is inserted into the side hole at the side wall of the first column and sealed; the inner cavity of the first column is provided with a first wire for supplying power to the electric heating rod; the flow guide tube is arranged horizontally, and there are several flow guide tubes arranged in a vertically equidistant linear array; the filter module includes a shell and a filter assembly installed in the inner cavity of the shell.

[0007] As a further optimization of this utility model, a first gap for the flow of insulating oil is provided between the outer wall of the first column and the inner wall of the guide tube; a second gap for the flow of insulating oil is provided between the outer wall of the electric heating rod and the inner wall of the guide tube.

[0008] As a further optimization of this utility model, a single guide tube includes two arc plates that are fastened together in a cylindrical shape, and the two arc plates are sealed and fixedly connected.

[0009] As a further optimization of this utility model, the outer shell has a cylindrical structure, and a top cover is detachably installed at the top of the outer shell; the lower part of the outer shell has a stepped structure; the lower part of the outer shell is provided with an annular concave portion, and the inner cavity of the outer shell is provided with a support surface at the top position of the concave portion, and the filter assembly is pressed against the support surface.

[0010] As a further optimization of this utility model, the filter assembly includes a first horizontal plate, a second horizontal plate, a support ring, and a filter bag; the first horizontal plate is disposed below the support ring, and the second horizontal plate is disposed above the support ring; the first horizontal plate has an insertion hole that can accommodate the filter bag, and the second horizontal plate has a recess that can be inserted into the insertion hole, the recess being able to be inserted into the support ring; the support ring is adapted to be installed at the top opening of the filter bag.

[0011] As a further optimization of this utility model, the recessed portion has an inverted conical structure and both the top and bottom are open.

[0012] As a further optimization of this utility model, the filter module further includes a first abutting frame disposed between two adjacent filter components and used for transmitting pressure; the first abutting frame includes a first ring body, a second ring body and a support column, the first ring body is disposed below the second ring body and coaxially arranged, the top end of the support column is fixedly connected to the second ring body and the bottom end is fixedly connected to the first ring body, and a plurality of support columns are provided and arranged in a circumferential array along the first ring body.

[0013] As a further optimization of this utility model, the filter module further includes a second abutment frame disposed between the filter assembly and the top cover for transmitting pressure; the second abutment frame includes a first annular plate, a second annular plate and a support plate, the first annular plate is disposed below the second annular plate and coaxially arranged, the top end of the support plate is fixedly connected to the second annular plate and the bottom end is fixedly connected to the first annular plate, and a plurality of support plates are provided and arranged in a circumferential array along the first annular plate;

[0014] An oil inlet gap is provided between adjacent support plates.

[0015] As a further optimization of this utility model, the bottom end of the first column is fixedly connected to the workbench; a support base is installed on the workbench, the support base includes a cross brace and several legs connected to the cross brace; the cross brace is provided with mounting holes, and the concave portion of the outer shell can be adapted to be inserted into the mounting holes; the outer wall of the outer shell is provided with a pressing surface at the top of the concave portion, and the pressing surface is adapted to be pressed against the top surface of the cross brace.

[0016] As a further optimization of this utility model, both the supporting surface and the pressing surface are annular.

[0017] In summary, this utility model has at least one of the following advantages:

[0018] (1) The guide tube and the U-shaped tube are arranged in an S-shape. Each guide tube is equipped with an electric heating rod. When the insulating oil flows through several heating rods in sequence, it can achieve multiple and rapid heating, thus making the present invention have high heating efficiency.

[0019] (2) The two ends of the electric heating rod are connected to the first column respectively, so that the middle part can be suspended and installed in the center of the guide tube. When the insulating oil flows through the second gap, it is squeezed into a cylindrical shape with uniform wall thickness. When the electric heating rod heats the insulating oil with uniform wall thickness from the middle, it has the advantages of uniform heating, high efficiency and reduced unnecessary heat loss.

[0020] (3) Several guide pipes are arranged in a vertical, equally spaced straight array. At the same time, the first column and the guide pipes are connected in an open shape. Therefore, the heating module has a smaller width, the heating module has a smaller floor area, and the workbench has a smaller top view area. Thus, this utility model can move and shuttle in the narrow space of the test site, improving the convenience of construction.

[0021] (4) This utility model can simultaneously take into account the technical advantages of rapid heating and small size.

[0022] (5) The lower part of the outer shell is stepped, thus forming multiple support surfaces for installing filter components. The multiple filter components are arranged vertically, which can realize multi-stage filtration of insulating oil and improve the filtration effect.

[0023] (6) The recessed part can be inserted into the support ring to achieve lateral positioning of the clamping ring and the filter bag, thus avoiding the problem of the filter bag sliding into the gap between the first and second horizontal plates, which would cause the filtration function to fail.

[0024] (7) The top cover, the second abutting frame, the filter assembly, and the first abutting frame are pressed together in sequence to avoid the problem of the first and second horizontal plates in the filter assembly becoming detached and causing the filter function to fail. At the same time, after the user removes the top cover, the first and second abutting frames can be easily pulled out, which can further facilitate the installation and removal of the filter assembly and realize the convenient replacement of the filter bag. Attached Figure Description

[0025] The present application will be further explained below with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the heating module structure;

[0028] Figure 3 This is a schematic diagram showing the location and structure of the electric heating rod;

[0029] Figure 4 A schematic diagram showing the location of the side holes;

[0030] Figure 5 This is a side view diagram showing the location and structure of the first and second gaps;

[0031] Figure 6 This is a schematic diagram of an arc plate structure;

[0032] Figure 7 A front view of the sectional structure of the filter module;

[0033] Figure 8 A front view of the sectional structure of the filter assembly;

[0034] Figure 9 This is a schematic diagram of the connection structure between the support ring and the filter bag;

[0035] Figure 10 This is a top-view schematic diagram of the first horizontal plate structure;

[0036] Figure 11 This is a schematic diagram of the second horizontal plate structure viewed from an angle.

[0037] Figure 12 This is a schematic diagram of the first abutment frame structure;

[0038] Figure 13 This is a schematic diagram of the second connecting frame structure;

[0039] Figure 14 A front view diagram of the vertical section of the supporting pedestal structure.

[0040] Explanation of reference numerals in the attached figures:

[0041] In the picture,

[0042] 1. Workbench;

[0043] 2. Heating module; 21. First column; 211. Side hole; 212. First gap; 22. Guide pipe; 220. Arc plate; 23. U-shaped pipe; 24. First oil inlet pipe; 25. First oil outlet pipe; 26. Electric heating rod; 261. First wire; 262. Second gap;

[0044] 3. Filter module; 30. Support base; 301. Cross brace; 3011. Mounting hole; 302. Support leg; 31. Outer shell; 311. Recessed part; 3111. Support surface; 3112. Pressing surface; 312. Second oil inlet pipe; 313. Second oil outlet pipe; 32. Top cover; 33. Filter assembly; 331. First cross plate; 3311. Insertion hole; 332. Second cross plate; 3321. Recessed part; 333. Support ring; 334. Filter bag; 3341. Sewing thread; 34. First abutment frame; 341. First ring body; 342. Second ring body; 343. Vertical support column; 35. Second abutment frame; 351. First annular plate; 352. Second annular plate; 353. Vertical support plate; 3531. Oil inlet gap;

[0045] 4. Condensate tank. Detailed Implementation

[0046] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows:

[0047] Reference Figure 1 This embodiment provides a transformer insulating oil filtration device, including a workbench 1, a heating module 2, and a filtration module 3. The heating module 2 and the filtration module 3 are both installed on the workbench 1. The bottom surface of the workbench 1 is equipped with casters, which are pressed against the ground at the test site. The user can pull the workbench 1, the heating module 2, and the filtration module 3 to move them as a whole. That is, this utility model can be easily moved at the test site and has excellent operational convenience.

[0048] Heating module 2 and filter module 3 are connected by an oil supply pipe. After being heated by heating module 2, the insulating oil has better fluidity, which reduces the time it stays in filter module 3, thereby improving filtration efficiency.

[0049] Reference Figures 1-3The heating module 2 includes a first column 21, a guide pipe 22, a U-shaped pipe 23, a first oil inlet pipe 24, a first oil outlet pipe 25, and an electric heating rod 26. The first column 21 is vertically positioned, with its bottom fixedly connected to the workbench 1 (e.g., by bolts) and its top connected to the guide pipe 22 (e.g., by welding for a sealed connection). The guide pipe 22 is horizontally positioned, and several guide pipes 22 are arranged in a vertically spaced, linear array. There are two first columns 21, and the connection between the first column 21 and the guide pipe 22 forms an "X" shape. The guide pipe 22 is connected to the U-shaped pipe 23 in an "S" shape, meaning that several guide pipes 22 are connected in series through several U-shaped pipes 23, allowing the insulating oil to flow sequentially through several guide pipes 22 (within which the electric heating rod 26 is located) to achieve heating. Compared to the heating barrel, the heating module 2 has a higher thermal conductivity (the insulating oil inside the heating barrel has a larger wall thickness, resulting in lower thermal conductivity); at the same time, the first column 21 and the guide pipe 22 are connected in an open shape, thus having a smaller width. Therefore, the heating module 2 has a smaller footprint (specifically, the upper projected area) compared to the heating barrel, and the workbench 1 has a smaller area. Thus, this utility model can move and shuttle in the narrow space of the test site, improving the convenience of construction.

[0050] Reference Figures 2-3 The ends of the U-shaped pipe 23 and the guide pipe 22 are sealed and connected via flanges, sealing rings, and bolts. The end of the first inlet pipe 24 is sealed and connected to the end of the uppermost guide pipe 22 via flanges, sealing rings, and bolts. The uppermost U-shaped pipe 23 and the first inlet pipe 24 are respectively connected to both ends of the uppermost guide pipe 22. The end of the first outlet pipe 25 is sealed and connected to the end of the lowermost guide pipe 22 via flanges, sealing rings, and bolts. The lowermost U-shaped pipe 23 and the first outlet pipe 25 are respectively connected to both ends of the lowermost guide pipe 22.

[0051] Reference Figures 2-4 The first column 21 is partially inserted into the inner cavity of the guide tube 22, and partially exposed. The electric heating rod 26 is placed inside the guide tube 22 and coaxially arranged with it; both ends of the electric heating rod 26 are connected to the two first columns 21 respectively. The first column 21 has a hollow structure with a sealed top and an open bottom. The end of the electric heating rod 26 is inserted into a side hole 211 on the side wall of the first column 21 and sealed (e.g., by bolts and sealing rings). The inner cavity of the first column 21 is provided with a first wire 261 for supplying power to the electric heating rod 26. The electric heating rod 26 is connected to the electrical cabinet through the first wire 261, thereby achieving power supply. The electric heating rod 26 is a resistance heating rod with a thermally conductive insulating layer (e.g., a ceramic layer) on its surface, thereby preventing the electrons inside the resistance heating rod from contacting the insulating oil and improving safety.

[0052] Reference Figures 3-5 A first gap 212 is provided between the outer wall of the first column 21 and the inner wall of the guide tube 22 for the flow of insulating oil. The insulating oil can flow through the first gap 212 into the guide tube 22, preventing the first column 21 from blocking the inner cavity of the guide tube 22. A second gap 262 is provided between the outer wall of the electric heating rod 26 and the inner wall of the guide tube 22 for the flow of insulating oil. The insulating oil can flow through the first gap 212 into the electric heating rod 26, preventing the electric heating rod 26 from blocking the inner cavity of the guide tube 22.

[0053] Reference Figure 6 Each guide tube 22 includes two interlocking cylindrical arc plates 220, which are sealed and fixedly connected (e.g., by welding). The arc plates 220 are provided with arc-shaped grooves for accommodating the first column 21; the arc plates 220 are sealed and fixedly connected to the outer wall of the first column 21 at the arc-shaped groove position (e.g., by welding).

[0054] Reference Figure 7 and Figure 8 The filter module 3 includes a housing 31, a top cover 32, and a filter assembly 33 installed inside the housing 31.

[0055] Reference Figure 7 and Figure 8 The outer casing 31 has a cylindrical structure, and a top cover 32 is detachably installed at the top of the outer casing 31 (for example, through bolts and sealing rings to achieve a detachable connection, and with excellent sealing performance when connected). The lower part of the outer casing 31 has a stepped structure; the lower part of the outer casing 31 has an annular recess 311, and the inner cavity of the outer casing 31 has a support surface 3111 at the top of the recess 311. The filter assembly 33 is pressed onto the support surface 3111 for limiting its position.

[0056] Reference Figures 8-11The filter assembly 33 includes a first horizontal plate 331, a second horizontal plate 332, a support ring 333, and a filter bag 334. The first horizontal plate 331 is disposed below the support ring 333, and the second horizontal plate 332 is disposed above the support ring 333. The first horizontal plate 331 is provided with an insertion hole 3311 that can accommodate the filter bag 334, and the second horizontal plate 332 is provided with a recess 3321 that can accommodate the insertion hole 3311 (for example, a fixed connection is achieved by integral drawing). The recessed portion 3321 can be fitted into the support ring 333 to horizontally limit the support ring 333, thereby horizontally limiting the filter bag 334 and preventing the filter bag 334 from sliding into the gap between the first horizontal plate 331 and the second horizontal plate 332 (if the support ring 333 and the filter bag 334 slide into the gap between the first horizontal plate 331 and the second horizontal plate 332, the insertion hole 3311 will be exposed, meaning that the insulating oil will flow through the insertion hole 3311 instead of the filter bag 334 through the filter assembly 33, causing the filter assembly 33 to malfunction). The support ring 333 is fitted into the top opening of the filter bag 334.

[0057] Reference Figure 9 The top edge of the filter bag 334 is turned downward and fixedly connected with a sewing thread 3341 to form an annular cylindrical structure. The support ring 333 is placed in the inner cavity of the annular cylindrical structure, thereby supporting the top of the filter bag 334 and keeping it open. At the same time, since the support ring 333 is stuck between the first horizontal plate 331 and the second horizontal plate 332, the support ring 333 can apply a pulling force to the top of the filter bag 334, preventing the filter bag 334 from detaching from the filter assembly 33 under hydraulic pressure, thus ensuring the reliability of the filtration function.

[0058] Reference Figure 8 The recessed portion 3321 has an inverted conical structure with open top and bottom to allow insulating oil to flow. It can also be easily inserted into the support ring 333, the insertion hole 3311, and the filter bag 334, improving the installation error tolerance (during installation, the user's line of sight is from top to bottom, and the recessed portion 3321 is located below the second horizontal plate 332, so the user cannot visually observe whether the recessed portion 3321 is aligned with the insertion hole 3311, but instead uses trial and error for blind insertion; the lower diameter of the inverted conical structure is much smaller than the diameter of the insertion hole 3311 / the inner diameter of the support ring 333, so there is a greater chance of successful insertion, thereby improving the error tolerance), and improving loading and unloading efficiency.

[0059] Reference Figure 10 and Figure 11 The number and position of the insertion holes 3311, the number and position of the recesses 3321, the number and position of the support rings 333, and the number and position of the filter bags 334 are mutually compatible.

[0060] Reference Figure 7 , Figure 12 and Figure 13The filter module 3 further includes a first abutment frame 34 disposed between two adjacent filter components 33 for transmitting pressure. The filter module 3 also includes a second abutment frame 35 disposed between the filter component 33 and the top cover 32 for transmitting pressure. When the top cover 32 is fully engaged, it presses down onto the second abutting frame 35, which in turn presses down onto the filter assembly 33 at its highest position (the top edge of the frame). The filter assembly 33 at its highest position then presses down onto the first abutting frame 34 at its highest position (the top edge of the frame), which in turn presses down onto the filter assembly 33 at its second-highest position, and so on. This achieves height limitation of the filter assembly 33, allowing the second horizontal plate 332 and the first horizontal plate 331 to clamp the support ring 333 (and the filter bag 334 fitted on the support ring 333) from both the top and bottom. This prevents the first horizontal plate 331, the second horizontal plate 332, and the support ring 333 from detaching and failing, and also prevents the insulating oil from escaping through the gaps between the support ring 333 and the first horizontal plate 331, and between the support ring 333 and the second horizontal plate 332. In other words, it forces the insulating oil to flow through the filter bag 334 to achieve the filtration function.

[0061] Reference Figure 7 and Figure 8 A sealing ring is provided at the outer edge of the lower surface of the first horizontal plate 331 (e.g., by snap-fit ​​connection or by adhesive connection). The first horizontal plate 331 and the support surface 3111 squeeze the sealing ring from the upper and lower sides to achieve a seal between the first horizontal plate 331 and the support surface 3111, preventing the insulating oil from escaping through the gap between the first horizontal plate 331 and the support surface 3111, that is, forcing the insulating oil to flow through the filter bag 334 to achieve the filtration function.

[0062] Reference Figure 7 and Figure 12 The first abutment frame 34 includes a first ring body 341, a second ring body 342, and upright columns 343. The first ring body 341 is located below the second ring body 342 and is coaxially arranged. The top end of the upright column 343 is fixedly connected to the second ring body 342 (e.g., by welding or by bolts), and the bottom end is fixedly connected to the first ring body 341 (e.g., by welding or by bolts). Several upright columns 343 are arranged in a circumferential array along the first ring body 341. The first ring body 341 is adapted to press against the outer edge of the lower second horizontal plate 332, and the second ring body 342 is adapted to abut against the outer edge of the upper first horizontal plate 331, thus achieving pressure transmission. The outer diameters of the first ring body 341 and the second ring body 342 are adapted to the inner diameter of the inner cavity of the outer shell 31 at that location.

[0063] Reference Figure 7 and Figure 13The second abutment frame 35 includes a first annular plate 351, a second annular plate 352, and a support plate 353. The first annular plate 351 is disposed below the second annular plate 352 and coaxially arranged. The top end of the support plate 353 is fixedly connected to the second annular plate 352 (e.g., by welding or by bolts), and the bottom end is fixedly connected to the first annular plate 351 (e.g., by welding or by bolts). Several support plates 353 are arranged in a circumferential array along the first annular plate 351. The first annular plate 351 is adapted to press against the edge of the second horizontal plate 332, and the second annular plate 352 is adapted to abut against the edge of the top cover 32, thus achieving pressure transmission. The outer diameters of the first annular plate 351 and the second annular plate 352 are adapted to the inner diameter of the inner cavity of the outer shell 31 at that location.

[0064] Reference Figure 7 and Figure 13 An oil inlet gap 3531 is provided between adjacent support plates 353, so that insulating oil injected through the second oil inlet pipe 312 can pass through the oil inlet gap 3531 and flow into the inner cavity of the outer shell 31.

[0065] Reference Figure 7 The end of the second oil inlet pipe 312 is connected to the top of the side wall of the outer casing 31 (e.g., through welding to achieve a sealed and fixed connection), and the second oil outlet pipe 313 is connected to the bottom of the outer casing 31 (e.g., through welding to achieve a sealed and fixed connection). The second oil inlet pipe 312 communicates with the inner cavity of the outer casing 31, and the second oil outlet pipe 313 communicates with the inner cavity of the outer casing 31.

[0066] Reference Figure 1 and Figure 14 A support base 30 is installed on the workbench 1. The support base 30 is used to support the outer shell 31, so that the bottom end of the second oil outlet pipe 313 at the bottom of the outer shell 31 is kept in a suspended state, which facilitates the connection and disassembly between the second oil outlet pipe 313 and the third oil supply pipe and improves the convenience of testing.

[0067] Reference Figure 1 and Figure 14 The support base 30 includes a cross brace 301 and several legs 302 (at least four) connected to the cross brace 301. The top ends of the legs 302 are fixedly connected to the outer edge of the cross brace 301 (e.g., by bolts or by welding), and the bottom ends of the top ends of the legs 302 are fixedly connected to the worktable 1 (e.g., by bolts or by welding). The cross brace 301 has mounting holes 3011, and the recessed portion 311 of the outer shell 31 can be fitted into the mounting holes 3011. The outer wall of the outer shell 31 has a pressing surface 3112 at the top end of the recessed portion 311, and the pressing surface 3112 is fitted and pressed against the top surface of the cross brace 301, thereby realizing the vertical support of the outer shell 31 by the cross brace 301.

[0068] Both the support surface 3111 and the pressing surface 3112 are annular to fit the cylindrical outer shell 31.

[0069] The oil pipeline includes a first oil pipeline, a second oil pipeline, a third oil pipeline, and a fourth oil pipeline. The first, second, third, and fourth oil pipelines are all hydraulic hoses.

[0070] Usage steps (refer to) Figure 2 and Figure 7 ① The user first connects one end of the first oil supply pipe to the oil pump outlet (e.g., via a union joint) and the other end to the first oil inlet pipe 24 (the end furthest from the guide pipe 22) and connects them (e.g., via a union joint); ② The user then connects one end of the second oil supply pipe to the first oil outlet pipe 25 (the end furthest from the guide pipe 22) and connects them (e.g., via a union joint), and the other end to the second oil inlet pipe 312 (the end furthest from the housing 31) and connects them (e.g., via a union joint); ③ The user then connects the second oil supply pipe to the first oil outlet pipe 25 (the end furthest from the guide pipe 22) and connects them (e.g., via a union joint); One end of the three oil supply pipe is connected to and connected to the second oil outlet pipe 313 (the end away from the outer casing 31, i.e., the bottom end) (e.g., through a union joint), and the other end is connected to and connected to the transformer's return oil nozzle (e.g., through a union joint); ④ The user then connects and connects one end of the fourth oil supply pipe to the oil pump's inlet nozzle (e.g., through a union joint), and the other end is connected to and connected to the transformer's outlet nozzle; ⑤ The oil pump and electric heating rod 26 are started, and the insulating oil in the transformer is pumped into the heating module 2 and the filter module 3 to achieve heating and filter out impurities.

[0071] If the user connects a cooling module (such as a condenser tank 4, a vacuum dehydration tank, etc.) in series after the filter module 3 and before the transformer's oil return nozzle, the low-temperature insulating oil can be allowed to flow back into the transformer.

[0072] The oil pump is fixedly installed on the upper surface of the workbench 1 by bolts.

[0073] The union fitting is a standard existing technology in the industry, and its specific structure will not be described in detail.

[0074] This utility model also includes an electrical cabinet and a temperature sensor. The electrical cabinet is fixedly mounted on the upper surface of the workbench 1 by bolts. The temperature sensor is plugged into the top cover 32, and its probe is plugged into the inner cavity of the outer shell 31, thereby monitoring the temperature of the insulating oil in the inner cavity of the outer shell 31. The temperature sensor and the top cover 32 are sealed and fixedly connected by bolts and a sealing ring. When the temperature signal detected by the temperature sensor is lower than the preset range, the power of the oil pump needs to be reduced and the power of the electric heating rod 26 needs to be increased, thereby increasing the residence time of the insulating oil in the heating module 2 and increasing the heat received by the insulating oil in the heating module 2, so as to increase the temperature of the insulating oil in the inner cavity of the outer shell 31. When the temperature signal detected by the temperature sensor is higher than the preset range, the power of the oil pump needs to be increased and the power of the electric heating rod 26 needs to be reduced, thereby reducing the residence time of the insulating oil in the heating module 2 and reducing the heat received by the insulating oil in the heating module 2, so as to reduce the temperature of the insulating oil in the inner cavity of the outer shell 31. When the temperature signal detected by the temperature sensor is within the preset range, the power of the oil pump remains unchanged.

[0075] The temperature sensor and oil pump are connected to the electrical cabinet via wires and signal lines, respectively. The electric heating rod 26 is connected to the electrical cabinet via the first wire 261. The electrical cabinet is connected to the external power supply and the external controller (such as a computer or PLC programmable logic controller) via wires and signal lines, respectively. The external controller controls the start-stop and other working states of the temperature sensor, oil pump and electric heating rod 26 in this utility model through the electrical cabinet.

[0076] The motor in the oil pump is a controllable motor (such as a servo motor or a stepper motor). By inputting electrical signals to the controllable motor through an external controller, the speed and start / stop timing of the controllable motor can be controlled, thereby adjusting the power of the oil pump.

[0077] The outer sides of the flow guide tube 22 and the U-shaped tube 23 are respectively fitted with an insulation layer (such as a cylindrical structure of sponge material) to reduce heat loss.

[0078] This invention features a simple structure and reliable function. The guide tube 22 and U-shaped tube 23 are arranged in an S-shape, and each guide tube 22 is equipped with an electric heating rod 26. When the insulating oil flows through several heating rods in sequence, it can achieve multiple and rapid heating, thus giving this invention high heating efficiency. The two ends of the electric heating rod 26 are connected to the first column 21, and the middle part can be suspended in the center of the guide tube 22. When the insulating oil flows through the second gap 262, it is squeezed into a cylindrical shape with uniform wall thickness. When the electric heating rod 26 heats the uniformly thick cylindrical insulating oil from the middle, it achieves uniform heating, high efficiency, and reduces unnecessary heat loss. Several guide pipes 22 are arranged in a vertical, equally spaced linear array. The first column 21 and the guide pipes 22 are connected in an open shape. Therefore, the heating module 2 has a smaller width, resulting in a smaller footprint (specifically, the upper projected area). Consequently, the workbench 1 has a smaller area. This allows the invention to move and maneuver within the confined space of the testing site, improving construction convenience. Thus, this invention simultaneously achieves the technical advantages of rapid heating and small size.

[0079] The lower part of the outer casing 31 is stepped, thereby forming multiple support surfaces 3111 for installing filter components 33. The multiple filter components 33 are arranged vertically, which can realize multi-stage filtration of insulating oil and improve the filtration effect.

[0080] The second horizontal plate 332 and the first horizontal bar clamp the support ring 333 from the upper and lower sides, thereby vertically limiting the clamping ring and the filter bag 334; the recessed part 3321 can be inserted into the support ring 333 to achieve lateral limiting of the clamping ring and the filter bag 334; thus, the problem of the filter bag 334 sliding into the gap between the first horizontal plate 331 and the second horizontal plate 332, causing the filtration function to fail, can be avoided.

[0081] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0082] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0083] In conclusion, for those skilled in the art, any changes, modifications, substitutions, or variations made to this utility model based on its guidance, without departing from its principles and spirit, shall still fall within the protection scope of this utility model.

Claims

1. A transformer insulating oil filtration device, characterized in that: It includes a workbench (1), a heating module (2), and a filter module (3); the heating module (2) and the filter module (3) are both installed above the workbench (1); the heating module (2) and the filter module (3) are connected by an oil pipeline; The heating module (2) includes a first column (21), a guide pipe (22), a U-shaped pipe (23), a first oil inlet pipe (24), a first oil outlet pipe (25), and an electric heating rod (26); the first column (21) and the guide pipe (22) are connected in an open shape, and the guide pipe (22) and the U-shaped pipe (23) are connected in an S-shape; The first column (21) is partially inserted into the inner cavity of the guide tube (22), and the electric heating rod (26) is placed in the inner cavity of the guide tube (22) and coaxially arranged with the guide tube (22); there are two first columns (21), and the two ends of the electric heating rod (26) are respectively connected to the two first columns (21); The first column (21) has a hollow structure with a sealed top and an open bottom. The end of the electric heating rod (26) is inserted into the side hole (211) on the side wall of the first column (21) and sealed. The inner cavity of the first column (21) is provided with a first wire (261) for supplying power to the electric heating rod (26). The guide tube (22) is arranged horizontally, and there are several guide tubes (22) arranged in a vertically equidistant linear array; The filter module (3) includes a housing (31) and a filter assembly (33) installed inside the housing (31).

2. The transformer insulating oil filtration device according to claim 1, characterized in that: A first gap (212) for the flow of insulating oil is provided between the outer wall of the first column (21) and the inner wall of the guide pipe (22); a second gap (262) for the flow of insulating oil is provided between the outer wall of the electric heating rod (26) and the inner wall of the guide pipe (22).

3. The transformer insulating oil filtration device according to claim 2, characterized in that: Each of the flow guide tubes (22) includes two interlocking arc plates (220) in a cylindrical shape, which are sealed and fixedly connected to each other.

4. The transformer insulating oil filtration device according to claim 3, characterized in that: The outer shell (31) has a cylindrical structure, and a top cover (32) can be detachably installed on the top of the outer shell (31). The lower part of the outer shell (31) has a stepped structure; the lower part of the outer shell (31) is provided with an annular concave portion (311), and the inner cavity of the outer shell (31) is provided with a support surface (3111) at the top of the concave portion (311), and the filter assembly (33) is pressed onto the support surface (3111).

5. The transformer insulating oil filtration device according to claim 4, characterized in that: The filter assembly (33) includes a first horizontal plate (331), a second horizontal plate (332), a support ring (333), and a filter bag (334); the first horizontal plate (331) is disposed below the support ring (333), and the second horizontal plate (332) is disposed above the support ring (333); the first horizontal plate (331) is provided with an insertion hole (3311) that can accommodate the filter bag (334), and the second horizontal plate (332) is provided with a recess (3321) that can be inserted into the insertion hole (3311), and the recess (3321) can be inserted into the support ring (333); the support ring (333) is adapted to be installed at the top opening of the filter bag (334).

6. The transformer insulating oil filtration device according to claim 5, characterized in that: The recessed portion (3321) has an inverted cone shape and both the top and bottom are open.

7. The transformer insulating oil filtration device according to claim 6, characterized in that: The filter module (3) further includes a first abutting frame (34) disposed between two adjacent filter components (33) and used for transmitting pressure; the first abutting frame (34) includes a first ring (341), a second ring (342) and a support column (343), the first ring (341) is disposed below the second ring (342) and coaxially disposed, the top end of the support column (343) is fixedly connected to the second ring (342) and the bottom end is fixedly connected to the first ring (341), and a plurality of support columns (343) are provided and arranged in a circumferential array along the first ring (341).

8. The transformer insulating oil filtration device according to claim 7, characterized in that: The filter module (3) further includes a second abutment frame (35) disposed between the filter assembly (33) and the top cover (32) for transmitting pressure; the second abutment frame (35) includes a first annular plate (351), a second annular plate (352) and a support plate (353), the first annular plate (351) is disposed below the second annular plate (352) and coaxially disposed, the top end of the support plate (353) is fixedly connected to the second annular plate (352) and the bottom end is fixedly connected to the first annular plate (351), and a plurality of support plates (353) are provided and arranged in a circumferential array along the first annular plate (351); An oil inlet gap (3531) is provided between adjacent support plates (353).

9. The transformer insulating oil filtration device according to claim 8, characterized in that: The bottom end of the first column (21) is fixedly connected to the workbench (1); The workbench (1) is equipped with a support base (30), which includes a cross brace (301) and a plurality of legs (302) connected to the cross brace (301); the cross brace (301) is provided with a mounting hole (3011), and the recess (311) of the outer shell (31) can be adapted to be inserted into the mounting hole (3011); The outer wall of the outer shell (31) is provided with a pressing surface (3112) at the top of the recess (311), and the pressing surface (3112) is adapted to press against the top surface of the cross brace (301).

10. The transformer insulating oil filtration device according to claim 9, characterized in that: Both the support surface (3111) and the pressing surface (3112) are annular.

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