Energy-saving and environment-friendly power transformer

Abstract

This invention relates to the field of transformer technology, specifically to an energy-saving, green, and environmentally friendly power transformer. It includes a transformer tank and a floating oil filter chamber located above the tank. An online oil filtration device chamber is located at the lower part of the floating oil filter chamber. The transformer tank's internal core is a three-dimensional wound core, and the transformer oil inside the tank is a high-ignition-point, biodegradable natural ester FR3 insulating oil. The upper part of the transformer tank is equipped with an elbow-shaped cable plug, an insulating sleeve, and a multi-functional protection device. This invention's transformer, through its online oil filtration device chamber, utilizes the natural convection circulation of the transformer oil for heat dissipation, combined with the floating oil filter chamber, to achieve automatic oil filtration without shutdown, eliminating the need for power equipment such as oil pumps, resulting in greater stability and energy savings.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to an energy-saving, green, and environmentally friendly power transformer. Background Technology

[0002] Various intelligent transformers require transformer oil to improve insulation strength and heat dissipation. During operation, under the influence of operating temperature and electric field, the oil molecules undergo oxidation, increasing the acidity in the oil. This acidity further corrodes copper, iron, and insulating varnish, forming sludge. Sludge is conductive, reducing the insulation performance of the transformer oil, affecting heat dissipation, and causing various hidden dangers. Therefore, current technology requires periodic replacement of transformer oil. This method consumes a significant amount of transformer oil, has recycling issues, and is not environmentally friendly. Some large transformers have internal continuous filtration systems that continuously filter sludge during operation using pumps and filters to extend the transformer oil's lifespan. However, such equipment requires electrically driven pumps, resulting in significant power consumption over long-term operation, making it inefficient. Furthermore, the high-speed continuous operation of the pump itself can introduce metal particles. Summary of the Invention

[0003] The purpose of this invention is to provide an energy-saving, green and environmentally friendly power transformer that uses the thermal expansion and contraction of transformer oil, combined with a floating oil filter chamber, to filter the transformer oil and collect sludge, making it more energy-efficient and environmentally friendly.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an energy-saving, green, and environmentally friendly power transformer, comprising a transformer tank and an oil filter floating chamber disposed above the transformer tank. An online oil filter device chamber is disposed at the lower part of the oil filter floating chamber, and the oil filter floating chamber is connected to the transformer tank via the online oil filter device chamber. A partition plate is disposed inside the online oil filter device chamber, dividing the inner cavity of the online oil filter device chamber into a first chamber and a second chamber. The second chamber is directly connected to the transformer oil inside the transformer tank. A first one-way valve and a second one-way valve are disposed on the second chamber. The first one-way valve allows the transformer oil in the second chamber to flow unidirectionally towards the first chamber, and the second one-way valve allows the transformer oil in the first chamber to flow unidirectionally towards the second chamber. A filter cylinder is disposed inside the first chamber, and the filter cylinder is connected to the second one-way valve. The transformer oil in the first chamber is first filtered through the filter cylinder and then flows unidirectionally towards the second chamber via the second one-way valve.

[0005] A filter holder is fixedly installed on the inner wall of the online oil filtration device compartment, inside the first chamber. A rotating sleeve is installed at the end of the filter holder. The rotating sleeve is cylindrical and open at both ends. A spiral scraper is fixedly installed on the inner wall of the rotating sleeve. The spiral scraper is thin and spirally arranged.

[0006] The filter cylinder is fixedly fitted with a filter sleeve body, and the filter cylinder filters the transformer oil through the filter sleeve body. The filter cylinder has a through hole wall portion, and the hole wall portion corresponds to the position of the filter sleeve body. The spiral scraper is in contact with the outer surface of the filter sleeve body.

[0007] The filter holder has an internal sludge channel. When the rotating sleeve rotates, the spiral scraper pushes the sludge on the surface of the filter sleeve towards the sludge channel. An outer pre-control sleeve is threadedly installed in the filter holder. A pre-control ring is fixedly installed on the outer pre-control sleeve. When the outer pre-control sleeve is loosened, the pre-control ring will seal with the filter holder. When the outer pre-control sleeve is tightened, the pre-control ring will block and seal the end of the sludge channel. A top plug bolt is threadedly installed in the outer pre-control sleeve.

[0008] The floating oil filter chamber is equipped with a rubber bladder inside. An adhesive sheet is fixedly mounted on the surface of the rubber bladder. A connecting frame is fixedly mounted on the adhesive sheet. A sliding frame is fixedly mounted at the lower end of the connecting frame. A limit rail is fixedly mounted on the inner wall of the first chamber. The sliding frame is limited and positioned in the limit rail, allowing it to move only up and down.

[0009] The sliding frame is provided with a zigzag rack inside, and connecting spring pieces are fixedly provided at both ends of the zigzag rack. The zigzag rack is installed in conjunction with the sliding frame through the connecting spring pieces.

[0010] A ratchet portion is fixedly provided on the surface of the rotating sleeve, and a helical rack meshes with the ratchet portion; a limiting tooth is also fixedly provided on the inner wall of the first chamber, which meshes with the ratchet portion to prevent the ratchet portion from rotating in the opposite direction.

[0011] The filter cartridge has a fixedly installed inner control cylinder, which is a cylindrical tube with openings at both ends. One of the openings has an expansion rim, which is fixedly connected to the inner wall of the hole wall. The expansion rim is biased towards the side of the hole wall closer to the filter base.

[0012] The filter cylinder is equipped with an axially movable retaining ring inside. When the retaining ring moves toward the sub-control inner cylinder, it can seal the end of the sub-control inner cylinder and the inner wall of the filter cylinder, so that the transformer oil can only be filtered through the filter sleeve near the filter base and enter the second one-way valve.

[0013] A connector is fixedly mounted on the retaining ring, and a magnetic ring is fixedly mounted on the connector. A polygonal prism is fixedly mounted inside the filter cylinder. The polygonal prism is inserted through the magnetic ring, limiting the magnetic ring to move only axially. An end plate is fixedly mounted at the end of the polygonal prism. An elastic element is provided between the end plate and the magnetic ring. An electromagnet is fixedly mounted on the end plate. By energizing the electromagnet, the magnetic ring is magnetically attracted and moved, thereby realizing the axial movement control of the retaining ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The transformer of the present invention, through the online oil filtration device chamber, can utilize the volume change of transformer oil due to thermal expansion and contraction, in conjunction with the floating oil filtration chamber, to achieve automatic filtration of transformer oil without stopping the machine. It does not require the drive of oil pumps or other electrical equipment, making it more stable and energy-saving, and can effectively extend the service life of transformer oil. It is green and environmentally friendly and suitable for intelligent large transformers.

[0015] 2. The present invention, through the combination of a filter holder, a rotating sleeve and a spiral scraper, can automatically scrape off the sludge generated on the surface of the filter sleeve and push it into the interior of the outer pre-control sleeve, which can achieve long-term maintenance-free operation and make maintenance and cleaning more convenient.

[0016] 3. The present invention, through the combination of the connecting frame, ratchet part and helical rack, can realize the unidirectional rotation drive of the rotating sleeve by utilizing the volume change of the rubber bladder, without the need for additional electric components such as motors for rotation drive, thus saving energy.

[0017] 4. Through the combination of the sub-control inner cylinder and the retaining ring, the present invention can periodically restrict the transformer oil to only pass through the filter sleeve near the filter seat to enter the second one-way valve during the process of the transformer oil cooling and flowing back into the transformer tank. This allows the transformer oil to flow a deeper distance along the internal axial direction of the rotating sleeve, pushing the sludge on the surface of the spiral scraper towards the sludge channel and improving the sludge collection efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the floating oil filter compartment of the present invention.

[0020] Figure 3 This is a schematic diagram of the floating oil filtration tank of the present invention.

[0021] Figure 4 This is a cross-sectional view of the floating oil filtration tank of the present invention.

[0022] Figure 5 This is a three-dimensional half-sectional view of the floating oil filtration chamber of the present invention.

[0023] Figure 6 This is a three-dimensional half-sectional view of the online oil filtration device compartment of the present invention.

[0024] Figure 7 This is a three-dimensional half-sectional view of the filter cylinder of the present invention.

[0025] Figure 8 This is a three-dimensional half-section view of the cross-sectional angle of the floating oil filter chamber of the present invention.

[0026] Figure 9 This is a three-dimensional half-sectional view of the cross-sectional angle of the ratchet portion of the present invention.

[0027] Figure 10 This is a schematic diagram of the rotating sleeve structure of the present invention.

[0028] In the diagram: 1. Transformer housing; 2. Floating oil filter chamber; 3. Online oil filter device chamber; 4. Divider plate; 5. First chamber; 6. Second chamber; 7. First check valve; 8. Second check valve; 9. Filter cartridge; 101. Heat sink; 102. Elbow cable plug; 103. Insulating sleeve; 104. Multifunctional protection device; 201. Rubber bladder; 202. Adhesive sheet; 203. Connecting frame; 204. Sliding frame; 205. Limiting rail; 206. Helical rack; 207. Connecting spring; 208. Ratchet; 209. Limiting tooth; 301. Filter holder; 302. Rotating sleeve; 303. Spiral scraper; 304. Filter sleeve body; 305. Hole wall section; 306. Sludge channel; 307. Outer pre-control sleeve; 308. Pre-control ring; 309. Top plug bolt; 310. Interconnecting pipe; 901. Controlled inner cylinder; 902. Retaining ring; 903. Connecting piece; 904. Magnetic ring; 905. Polygonal prism; 906. End plate; 907. Elastic component; 908. Electromagnet. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 10 This invention provides a technical solution: an energy-saving, green, and environmentally friendly power transformer. This transformer aims to extend the service life of transformer oil and utilizes the volume change due to thermal expansion and contraction of the transformer oil to achieve automated filtration. Specific embodiments are as follows: The transformer of the present invention is mainly composed of a transformer housing 1 and an oil filter floating chamber 2 set above the transformer housing 1. The internal core of the transformer housing 1 adopts a three-dimensional wound core.

[0031] See Figure 1 As shown, a heat sink 101 is provided on the outside of the transformer housing 1. The heat sink 101 is connected to the transformer oil inside the transformer housing 1 to improve the heat dissipation capacity of the transformer housing 1.

[0032] The upper part of the transformer housing 1 is equipped with an elbow-shaped cable plug 102, an insulating sleeve 103, and a multi-functional protection device 104. The elbow-shaped cable plug 102 and the insulating sleeve 103 are used for the wiring of the transformer. The multi-functional protection device 104 is a protection device that integrates gas protection, overvoltage protection, temperature display and temperature control, and has remote control function.

[0033] See Figure 5 As shown, the lower part of the oil filter floating tank 2 is provided with an online oil filter device tank 3, and the oil filter floating tank 2 is connected to the transformer box 1 through the online oil filter device tank 3.

[0034] The online oil filtration device compartment 3 is internally equipped with a partition plate 4, which divides the inner cavity of the online oil filtration device compartment 3 into a first chamber 5 and a second chamber 6. The second chamber 6 is directly connected to the transformer oil inside the transformer tank 1. (See reference...) Figure 5 As shown, the bottom of the online oil filtration device chamber 3 is fixedly connected to an interactive pipe 310. The second chamber 6 is connected to the inner cavity of the transformer housing 1 through the interactive pipe 310. The transformer oil completely fills the inner cavities of the transformer housing 1, the second chamber 6 and the first chamber 5, and the liquid level is at an appropriate position in the oil filtration floating chamber 2.

[0035] The transformer oil of the present invention preferably uses environmentally friendly media such as natural ester FR3 insulating oil to replace traditional mineral oil. It has the characteristics of high ignition point, biodegradability, and low carbon emissions, and is suitable for power supply scenarios with high requirements for environmental protection and fire protection.

[0036] The second chamber 6 is equipped with a first check valve 7 and a second check valve 8. The first check valve 7 and the second check valve 8 have the same structure and principle. See details. Figure 6 As shown, this is a common design and will not be described in detail here. The first one-way valve 7 allows the transformer oil in the second chamber 6 to flow unidirectionally into the first chamber 5, and the second one-way valve 8 allows the transformer oil in the first chamber 5 to flow unidirectionally into the second chamber 6. A filter cylinder 9 is provided inside the first chamber 5, and the filter cylinder 9 is connected to the second one-way valve 8. The transformer oil in the first chamber 5 is first filtered through the filter cylinder 9, and then flows unidirectionally into the second chamber 6 through the second one-way valve 8.

[0037] A filter holder 301 is fixedly installed on the inner wall of the online oil filtration device compartment 3, inside the first chamber 5. A rotating sleeve 302 is installed at the end of the filter holder 301. The rotating sleeve 302 is cylindrical and open at both ends. A spiral scraper 303 is fixedly installed on the inner wall of the rotating sleeve 302. The spiral scraper 303 is thin and spirally arranged.

[0038] A filter sleeve 304 is fixedly fitted on the surface of the filter cylinder 9. The filter sleeve 304 can filter transformer oil. The specific material is selected and adjusted according to actual needs. The filter cylinder 9 filters transformer oil through the filter sleeve 304. A hole wall portion 305 is opened through the filter cylinder 9. The hole wall portion 305 corresponds to the position of the filter sleeve 304. The spiral scraper 303 contacts the outer surface of the filter sleeve 304.

[0039] The filter housing 301 has an oil sludge channel 306 inside. When the rotating sleeve 302 rotates, the spiral scraper 303 scrapes and pushes the oil sludge on the surface of the filter sleeve 304 toward the direction of the oil sludge channel 306.

[0040] The filter holder 301 is threadedly fitted with an outer pre-control sleeve 307, on which a pre-control ring 308 is fixedly installed. When the outer pre-control sleeve 307 is loosened, the pre-control ring 308 will seal with the filter holder 301. When the outer pre-control sleeve 307 is tightened, the pre-control ring 308 will block and seal the end of the sludge channel 306. The outer pre-control sleeve 307 is threadedly fitted with a top plug bolt 309. The outer pre-control sleeve 307 and the top plug bolt 309 are respectively provided with hexagonal parts to facilitate the engagement with a wrench.

[0041] The floating oil filter chamber 2 is equipped with a rubber bladder 201 inside. An adhesive sheet 202 is fixedly installed on the surface of the rubber bladder 201. A connecting frame 203 is fixedly installed on the adhesive sheet 202. A sliding frame 204 is fixedly installed at the lower end of the connecting frame 203. A limit rail 205 is fixedly installed on the inner wall of the first chamber 5. The sliding frame 204 is limited in the limit rail 205 and can only move up and down.

[0042] The sliding frame 204 has an internal helical rack 206, such as Figure 9 As shown, the teeth on the helical rack 206 are inclined downwards, and connecting spring pieces 207 are fixedly provided at both ends of the helical rack 206. The helical rack 206 is installed in cooperation with the sliding frame 204 through the connecting spring pieces 207. Through the elastic force of the connecting spring pieces 207, the helical rack 206 can move away from the rotating sleeve 302.

[0043] A ratchet portion 208 is fixedly provided on the surface of the rotating sleeve 302, and the teeth on the ratchet portion 208 are as follows: Figure 9As shown, the rack 206 is inclined in a clockwise direction and engages with the ratchet portion 208. A limiting tooth 209 is also fixedly provided on the inner wall of the first chamber 5. The limiting tooth 209 and the inner wall of the first chamber 5 are fixedly connected by a spring piece. The limiting tooth 209 engages with the ratchet portion 208 to prevent the ratchet portion 208 from rotating in the opposite direction.

[0044] The filter cartridge 9 is fixedly provided with a control inner cylinder 901. The control inner cylinder 901 is a cylindrical tube with openings at both ends. An expansion rim is provided on the outside of one of the openings. The expansion rim is fixedly connected to the inner wall of the hole wall 305. The expansion rim is biased towards the side of the hole wall 305 near the location of the filter base 301.

[0045] The filter cylinder 9 is equipped with a retaining ring 902 that can move axially. When the retaining ring 902 moves toward the sub-control inner cylinder 901, it can seal the end of the sub-control inner cylinder 901 and the inner wall of the filter cylinder 9, so that the transformer oil can only be filtered through the filter sleeve 304 near the filter storage seat 301 and enter the second one-way valve 8.

[0046] A connector 903 is fixedly mounted on the retaining ring 902, and a magnetic ring 904 is fixedly mounted on the connector 903. A polygonal prism 905 is fixedly mounted inside the filter cylinder 9. The polygonal prism 905 is inserted through the magnetic ring 904, so that the magnetic ring 904 can only move axially. The polygonal prism 905 of this invention is hexagonal. Through the hexagonal structure and cooperation with the magnetic ring 904, the magnetic ring 904 cannot rotate, ensuring that the connector 903 is in the upper position.

[0047] An end plate 906 is fixedly provided at the end of the polygonal prism 905. An elastic member 907 is provided between the end plate 906 and the magnetic ring 904. An electromagnet 908 is fixedly provided on the end plate 906. By energizing the electromagnet 908, the magnetic ring 904 is magnetically attracted and moved, thereby realizing the axial movement control of the retaining ring 902.

[0048] During operation, the transformer of this invention experiences temperature changes in the transformer and its internal transformer oil due to variations in load and start-stop switching. When the transformer oil temperature rises, its volume expands, and the transformer oil inside the transformer tank 1 flows into the oil filter floating chamber 2 through the interchange pipe 310. Conversely, when the transformer oil temperature decreases, its volume contracts, and the transformer oil in the oil filter floating chamber 2 flows back into the transformer tank 1 through the interchange pipe 310. This is the operating principle of the oil filter floating chamber 2 in the prior art, which ensures stable transformer oil pressure inside the transformer tank 1. The oil filter floating chamber 2 contains a rubber bladder 201 to separate the transformer oil from the air. The principle of the rubber bladder 201 is the same as in the prior art. The inner cavity of the rubber bladder 201 is connected to the transformer breather in the prior art, which is an air filtration and drying device.

[0049] See Figure 5 and Figure 6 As shown, when the transformer oil inside the transformer housing 1 expands, it first enters the second chamber 6 through the interactive pipe 310. At this time, the second chamber 6 is under positive pressure, the second check valve 8 is closed, and the first check valve 7 is open. The transformer oil can only enter the first chamber 5 and the oil filter floating chamber 2 through the first check valve 7, which causes the liquid level inside the oil filter floating chamber 2 to rise and the rubber bladder 201 to shrink.

[0050] Conversely, when the transformer oil volume inside transformer tank 1 shrinks, the connection through the interlocking pipe 310 creates negative pressure inside the second chamber 6. At this time, the second check valve 8 opens and the first check valve 7 closes. Figure 6 As shown, the transformer oil in the oil filter floating chamber 2 and the first chamber 5 flows into the rotating sleeve 302 from the left end of the rotating sleeve 302. After being filtered by the filter sleeve 304, it enters the filter cylinder 9 and finally flows back into the transformer housing 1 through the second one-way valve 8, the second chamber 6 and the interactive pipe 310 in sequence.

[0051] By changing the volume of the transformer oil, and in conjunction with the structural design of the online oil filtration device chamber 3, the transformer oil is filtered, and impurities such as sludge in the transformer are filtered onto the surface of the filter sleeve 304.

[0052] During the above process, the volume of the rubber bladder 201 will expand and contract, see reference. Figure 8 and Figure 9 As shown, when the rubber bladder 201 expands, the connecting frame 203 pushes the sliding frame 204 downward, which engages with the ratchet portion 208 via the helical rack 206, driving the ratchet portion 208 to move... Figure 9 When rotated counterclockwise from a viewing angle, the teeth between the corresponding limiting tooth 209 and the ratchet portion 208 slide. When the rubber bladder 201 contracts, the connecting frame 203 moves upward, causing the helical rack 206 to move upward. At this time, the helical rack 206 elastically moves backward, causing the teeth between the helical rack 206 and the ratchet portion 208 to slide, while the teeth between the ratchet portion 208 and the limiting tooth 209 engage, preventing the ratchet portion 208 from... Figure 9 Rotate clockwise from the perspective of the viewpoint.

[0053] The above causes the ratchet portion 208 and the rotating sleeve 302 to be in Figure 9 From the perspective of the viewpoint, it can only rotate counterclockwise. (Refer to reference) Figure 7As shown, the unidirectional rotation of the rotating sleeve 302 drives the spiral scraper 303 to rotate, causing the spiral scraper 303 to scrape off the sludge on the surface of the filter sleeve 304 and push it towards the right-hand sludge channel 306. The sludge that moves to the far right is squeezed and pushed into the sludge channel 306 by the rotation of the spiral scraper 303, in conjunction with the reference. Figure 6 As shown, it is finally stored inside the outer pre-control sleeve 307.

[0054] As the transformer oil expands and contracts with temperature changes, its liquid level in the oil filter floating chamber 2 typically fluctuates between 1 / 4 and 3 / 4 of the total oil level in the oil filter floating chamber 2. Correspondingly, the lifting and lowering distance of the connecting frame 203 driven by the rubber bladder 201 is typically around 5cm-10cm. Based on the actual size of the oil filter floating chamber 2 and the rubber bladder 201, the pitch of the helical rack 206 should be much smaller than the lifting and lowering distance of the connecting frame 203. The preferred pitch of the helical rack 206 is 1.2mm to ensure that the driving stroke of the helical rack 206 on the ratchet part 208 is sufficient.

[0055] The interior of the outer pre-control sleeve 307 can be cleaned periodically. Through its structural design, this invention allows for maintenance without shutting down the system during cleaning and prevents transformer oil leakage. Figure 6 As shown, this invention employs a dual-sleeve design. During normal operation, the outer pre-control sleeve 307 is loosened to its limit position, allowing the pre-control ring 308 to press against the rubber ring inside the right-side filter seat 301, maintaining a seal. When cleaning is required, the outer pre-control sleeve 307 is tightened to its limit position, causing the pre-control ring 308 to move towards the sludge channel 306 and press against its port, completely sealing it. Then, the outer pre-control sleeve 307 is locked in position using a wrench, and the top plug bolt 309 is rotated relative to the outer pre-control sleeve 307. Once the top plug bolt 309 is unscrewed, the interior of the outer pre-control sleeve 307 can be cleaned without leakage of transformer oil through the sludge channel 306. After cleaning, the process can be reversed to reset.

[0056] See Figure 7 As shown, in the process of transformer oil entering the interior of the rotating sleeve 302 from the left end and flowing through the filter sleeve 304 for filtration, the electromagnet 908 is energized, causing it to generate magnetic force that attracts the magnetic ring 904 to move to the right. This, in turn, causes the retaining ring 902 to move to the right via the connector 903, so that the retaining ring 902 presses against the left end of the control inner cylinder 901, thus sealing the gap between the end of the control inner cylinder 901 and the inner wall of the filter cylinder 9.

[0057] At this time, when the transformer oil passes through the 304 filter sleeve, it is as follows: Figure 7Taking a medium-angle perspective as an example, filtration can only be performed through a partial filter sleeve 304 on the right side of the inner cylinder 901, near the filter base 301, while filtration stops in most of the left side of the filter sleeve 304. The technical effect achieved is that when the transformer oil flows inside the rotating sleeve 302, it flows axially deeper into the rotating sleeve 302, using the flow to scour the sludge scraped by the auxiliary spiral scraper 303 and drive it in a directional manner. By utilizing the flow of the transformer oil, the sludge is collected more efficiently towards the filter base 301.

[0058] The above-mentioned energization control of electromagnet 908 only requires energizing electromagnet 908 every once in a while, such as every 1 to 2 months, during the cooling process of the transformer. Temperature sensors are installed inside the transformer to capture the cooling period of the transformer.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving, green, and environmentally friendly power transformer, comprising a transformer tank and an oil filter floating chamber disposed above the transformer tank, characterized in that: The lower part of the oil filter floating tank is equipped with an online oil filtration device tank, and the oil filter floating tank is connected to the transformer tank through the online oil filtration device tank; The interior of the online oil filtration device compartment is equipped with a partition plate, which divides the inner cavity of the online oil filtration device compartment into a first chamber and a second chamber, wherein the second chamber is directly connected to the transformer oil inside the transformer tank. The second chamber is equipped with a first check valve and a second check valve. The first check valve allows the transformer oil in the second chamber to flow unidirectionally into the first chamber, and the second check valve allows the transformer oil in the first chamber to flow unidirectionally into the second chamber. The first chamber is equipped with a filter cylinder, which is connected to the second check valve. The transformer oil in the first chamber is first filtered through the filter cylinder and then flows unidirectionally into the second chamber through the second check valve.

2. The energy-saving, green, and environmentally friendly power transformer according to claim 1, characterized in that: A filter holder is fixedly installed on the inner wall of the online oil filtration device compartment, inside the first chamber. A rotatable rotating sleeve is installed at the end of the filter holder. The rotating sleeve is cylindrical and open at both ends. A spiral scraper is fixedly installed on the inner wall of the rotating sleeve. The spiral scraper is thin and arranged in a spiral pattern.

3. The energy-saving, green, and environmentally friendly power transformer according to claim 2, characterized in that: The filter cylinder is fixedly fitted with a filter sleeve body, and the filter cylinder filters the transformer oil through the filter sleeve body. The filter cylinder has a through hole wall portion, and the position of the through hole wall portion corresponds to that of the filter sleeve body. The spiral scraper blades are in contact with the outer surface of the filter sleeve.

4. The energy-saving, green, and environmentally friendly power transformer according to claim 3, characterized in that: The filter housing has an oil sludge channel inside. When the rotating sleeve rotates, the spiral scraper will scrape and push the oil sludge on the surface of the filter sleeve towards the direction of the oil sludge channel. The filter holder is threadedly fitted with an outer pre-control sleeve, and a pre-control ring is fixedly installed on the outer pre-control sleeve. When the outer pre-control sleeve is loosened, the pre-control ring will seal with the filter holder. When the outer pre-control sleeve is tightened, the pre-control ring will block and seal the end of the sludge channel. The outer pre-control sleeve is threadedly fitted with a top plug bolt.

5. The energy-saving, green, and environmentally friendly power transformer according to claim 2, characterized in that: The floating oil filter chamber is equipped with a rubber bladder inside. An adhesive sheet is fixedly installed on the surface of the rubber bladder. A connecting frame is fixedly installed on the adhesive sheet. A sliding frame is fixedly installed at the lower end of the connecting frame. A limiting rail is fixedly installed on the inner wall of the first chamber, and the sliding frame is limited in the limiting rail, allowing it to only move up and down.

6. The energy-saving, green, and environmentally friendly power transformer according to claim 5, characterized in that: The sliding frame is provided with a zigzag rack inside, and connecting spring pieces are fixedly provided at both ends of the zigzag rack. The zigzag rack is installed in conjunction with the sliding frame through the connecting spring pieces.

7. The energy-saving, green, and environmentally friendly power transformer according to claim 6, characterized in that: A ratchet portion is fixedly provided on the surface of the rotating sleeve, and a helical rack meshes with the ratchet portion; The inner wall of the first chamber is also fixedly provided with limiting teeth, which engage with the ratchet part to prevent the ratchet part from rotating in the opposite direction.

8. The energy-saving, green, and environmentally friendly power transformer according to claim 3, characterized in that: The filter cartridge has a fixedly installed inner control cylinder, which is a cylindrical tube with openings at both ends. One of the openings has an expansion rim, which is fixedly connected to the inner wall of the hole wall. The expansion rim is biased towards the side of the hole wall closer to the filter base.

9. The energy-saving, green, and environmentally friendly power transformer according to claim 8, characterized in that: The filter cylinder is equipped with an axially movable retaining ring inside. When the retaining ring moves toward the sub-control inner cylinder, it can seal the end of the sub-control inner cylinder and the inner wall of the filter cylinder, so that the transformer oil can only be filtered through the filter sleeve near the filter base and enter the second one-way valve.

10. The energy-saving, green, and environmentally friendly power transformer according to claim 9, characterized in that: A connector is fixedly provided on the retaining ring, and a magnetic ring is fixedly provided on the connector. A polygonal prism is fixedly provided inside the filter cylinder. The polygonal prism is limited by the magnetic ring, so that the magnetic ring can only move axially. An end plate is fixedly installed at the end of the polygonal prism. An elastic element is provided between the end plate and the magnetic ring. An electromagnet is fixedly installed on the end plate. By energizing the electromagnet, the magnetic ring is magnetically attracted and moved, thereby realizing the axial movement control of the retaining ring.

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