Oil pillow for oil-immersed transformer

Abstract

The invention relates to the technical field of transformers, and discloses an oil pillow for an oil-immersed transformer, comprising an oil storage cabinet, a fixing box is provided at the top of the oil storage cabinet, and ventilation pipes are fixedly connected to the bottom and one side of the fixing box. Through the fixing box provided above the oil storage cabinet, two rubber bags are connected to the outside of the fixing box through the ventilation pipe, and when the surface of one rubber bag is cracked, the insulating oil on the outside of the rubber bag will penetrate into the inside of the rubber bag, so that the insulating oil lubricates the contact surface between the slider and the friction rod, so that the slider slides in the direction of the fixed air bag due to its own gravity on the inside of the fixed bracket, and compresses the fixed air bag, so that the gas inside the fixed air bag is blown to the inside of the pneumatic telescopic rod through the connecting pipe, so that the pneumatic telescopic rod pushes the ventilation pipe corresponding to the other rubber bag to be connected, so that the internal air pressure is balanced through the two rubber bags, so that the cracked rubber bag is contracted due to the air pressure, so that the crack hole on the surface of the rubber bag is closed.

Description

Technical Field

[0001] The invention relates to the technical field of transformers, in particular to an oil pillow for an oil-immersed transformer. Background Art

[0002] The oil pillow for transformer is the oil conservator. The oil conservator is cylindrical in shape and is located above the transformer oil tank. It is connected to the transformer oil tank through a pipeline. When the transformer is in use, if the insulating oil inside the oil tank expands due to heat, the insulating oil flows from the oil tank to the oil conservator. If the insulating oil inside the oil tank contracts due to cold during the use of the transformer, the insulating oil flows from the oil conservator to the oil tank. In order to reduce the contact area between the insulating oil and the air, the oil-immersed transformer will install a capsule bag on the inside of the oil conservator. Its working principle is that the gas in the capsule bag is connected to the atmosphere through a breathing tube and a desiccant. The bottom of the capsule bag is close to the oil surface of the oil conservator. When the oil surface changes, the capsule bag will also expand or compress, thereby reducing the contact area between the insulating oil and the air. The dielectric loss tangent test of the insulating oil (referred to as oil dielectric loss) is carried out using a high-voltage bridge with a special bridge under I-frequency voltage. When it is damp, fibers, dust and free carbon exist in the insulating oil, which will greatly reduce the breakdown strength, increase the dielectric loss, and reduce the performance of the insulating oil.

[0003] When the capsule bag is used for a long time, due to the material problem of the capsule bag, cracks and micropores will appear on the surface of the capsule bag, and the bottom of the capsule bag is in contact with the oil surface, which will cause air and moisture to penetrate into the oil and enter the transformer oil tank. At the same time, the insulating oil will penetrate into the rubber bag, causing the water content in the oil to increase and the amount of insulating oil to decrease, the insulation performance to decrease, the oil dielectric loss to increase, and the aging process of the insulating oil to accelerate; when replacing the capsule bag, the insulating oil on the inside needs to be filtered out, and the insulating oil is put in after the capsule bag is installed, which increases the contact time between the insulating oil and the air and accelerates the aging of the insulating oil. At the same time, the replacement process requires power outage for maintenance, which makes the transformer unusable and affects the efficiency of the transformer. Summary of the invention

[0004] In view of the shortcomings of the existing transformer oil pillow during use mentioned in the background technology, the present invention provides an oil pillow for an oil-immersed transformer, which has the advantages of easy replacement and increased service life of primary insulating oil, and solves the technical problems raised in the above background technology.

[0005] The present invention provides the following technical solution: an oil pillow for an oil-immersed transformer, comprising an oil conservator, a top of the oil conservator is provided with a fixing box, a bottom end and one side of the fixing box are respectively fixedly connected with ventilation pipes, a ventilation valve is fixedly connected to the outside of each ventilation pipe, a telescopic bag is fixedly connected to the top of the fixing box, an air intake pipe is fixedly connected to the other side of the fixing box, the bottom end of each ventilation pipe is fixedly connected to a rubber bag, an inner bottom end of the rubber bag is fixedly connected to a fixing bracket, the bottom end of an inner cavity of the fixing bracket is inclined, a slider is slidably connected to the top end of the higher side of the inner cavity of the fixing bracket, a fixed airbag is movably connected to the lower side of the inner cavity of the fixing bracket, a friction rod located below the slider is fixedly connected to the bottom end of the inner cavity of the fixing bracket, a connecting pipe that reaches the inside of the fixing box along the inner side of the ventilation pipe is fixedly connected to the top end of the fixing airbag, a closing cover located on one radial side of each ventilation pipe is slidably connected to the inside of the fixing box, and a pneumatic telescopic rod located on the other radial side of each ventilation pipe is fixedly connected to the top end of the connecting pipe.

[0006] Preferably, a fixing plate is fixedly connected to the inner side of the fixing box, one side of the fixing plate faces the direction between the air inlet pipe and the telescopic bag, and the other side of the fixing plate faces the direction between the two ventilation pipes, and the bottom end of the fixing box is fixedly connected to a water box located below the bottom end of the fixing plate.

[0007] Preferably, the highest point of the inner cavity bottom surface of the fixing bracket is on the same horizontal line as the inner cavity bottom surface of the rubber bag, the circumferential side surface and the top end surface of the fixing bracket are hollowed out, and the bottom end surface of the fixing bracket as a whole is closed.

[0008] Preferably, the top end surface of the friction rod is rough, and the slider is subjected to static friction force from the top end of the friction rod, so that the slider is stabilized on the bottom end surface of the fixed bracket.

[0009] Preferably, an elastic buckle is fixedly connected to the inner side of the fixing box, and the elastic buckle is located at both ends of the sliding path of the closing cover.

[0010] The present invention has the following beneficial effects:

[0011] 1. The present invention arranges a fixing box above the oil storage cabinet, so that the outside of the fixing box is connected to two rubber bags through a ventilation pipe, and when the surface of one rubber bag is cracked, the insulating oil on the outside of the rubber bag will penetrate into the inside of the rubber bag, so that the insulating oil lubricates the contact surface between the slider and the friction rod, so that the slider slides in the direction of the fixed air bag due to its own gravity on the inside of the fixed bracket, and compresses the fixed air bag, so that the gas inside the fixed air bag is blown to the inside of the pneumatic telescopic rod through the connecting pipe, so that the pneumatic telescopic rod pushes the ventilation pipe corresponding to the other rubber bag to be connected, so that the internal air pressure is balanced through the two rubber bags, so that the cracked rubber bag is contracted due to the air pressure, so that the cracked hole on the surface of the rubber bag is closed, and the inside of the rubber bag is no longer infiltrated with insulating oil, so as to avoid aging of the insulating oil due to contact between the aperture and the air.

[0012] 2. The present invention arranges two rubber bags on the inner side of the oil storage cabinet. When the first used rubber bag is cracked, the closed cover on the outer side of the other rubber bag is opened by the pneumatic telescopic rod, so that the sliding rod is pushed by the closed cover, and the reaction causes the first used rubber bag to be closed, so that the other rubber bag continues to perform the work of rising and falling the oil level. Therefore, when both rubber bags are cracked, the rubber bags can be replaced, which increases the time interval for replacing the rubber bags, reduces the number of times the internal insulating oil needs to be filtered due to the replacement of the rubber bags, avoids the increase of the oil medium loss of the insulating oil, and increases the service life of the insulating oil.

[0013] 3. The present invention, through the setting of the fixing box, prevents the airflow entering through the desiccant and the air intake duct from returning to the atmosphere, thereby reducing the working intensity of the desiccant itself. At the same time, through the setting of the fixing plate, the fixing plate cooled by the telescopic bag and the air intake duct is blown to the bottom of the fixing plate during the contraction of the rubber bag, so that the hot air blown out from the inside of the rubber bag is condensed on the surface of the fixing plate and dehumidified continuously, so that the airflow inside the rubber bag is always dry, reducing the contact between the airflow and the insulating oil caused by cracking, and further improving the service life of the insulating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of a cutaway front view of the oil storage cabinet structure of the present invention;

[0015] Figure 2 For the present invention Figure 1 A schematic diagram of the structure enlargement in the middle;

[0016] Figure 3 For the present invention Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0017] Figure 4 It is a top view schematic diagram of the relationship between the ventilation duct structure inside the fixed box structure and the closing cover structure of the present invention.

[0018] In the figure: 1. oil storage cabinet; 2. fixing box; 3. ventilation pipe; 4. ventilation valve; 5. telescopic bag; 6. air intake pipe; 7. rubber bag; 8. fixing bracket; 9. sliding block; 10. fixing air bag; 11. friction rod; 12. connecting pipe; 13. closing cover; 14. pneumatic telescopic rod; 15. fixing plate; 16. water box. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 , an oil pillow for an oil-immersed transformer, comprising an oil storage cabinet 1, a fixed box 2 is provided at the top of the oil storage cabinet 1, a ventilation pipe 3 is fixedly connected to the bottom and one side of the fixed box 2, and a ventilation valve 4 is fixedly connected to the outside of each ventilation pipe 3, a bellows 5 is fixedly connected to the top of the fixed box 2, and the outside of the bellows 5 is exposed to the atmosphere, so that the gas inside the bellows 5 can continuously exchange heat with the atmospheric air through the surface, so that the gas blown out of the rubber bag 7 cools down the inside of the bellows 5, an air intake pipe 6 is fixedly connected to the other side of the fixed box 2, and a one-way valve is fixedly installed on the inside of the air intake pipe 6, and the flow direction of the air flow is from the outside of the air intake pipe 6 to the inside of the fixed box 2, and the bottom end of each ventilation pipe 3 is fixedly connected to the rubber bag 7, reference Figure 2 The inner bottom end of the rubber bag 7 is fixedly connected with a fixed bracket 8, the bottom end of the inner cavity of the fixed bracket 8 is inclined, the top of the higher side of the inner cavity of the fixed bracket 8 is slidably connected with a slider 9, the lower side of the inner cavity of the fixed bracket 8 is movably connected with a fixed airbag 10, the bottom end of the inner cavity of the fixed bracket 8 is fixedly connected with a friction rod 11 located below the slider 9, and the top of the fixed airbag 10 is fixedly connected with a connecting pipe 12 that reaches the inside of the fixed box 2 along the inner side of the ventilation pipe 3, reference Figure 3 , Figure 4The interior of the fixed box 2 is slidably connected with a closing cover 13 located on one radial side of each ventilation pipe 3, and the top of the connecting pipe 12 is fixedly connected with a pneumatic telescopic rod 14 located on the other radial side of each ventilation pipe 3, wherein a sliding rod that can rotate to push each closing cover 13 to close is connected through the surface of the fixed box 2, and the two sliding rods are linked by gears and toothed rods, and the directions of the straight lines where the sliding rods are located in the initial state are the same, that is, the connecting pipe 12 on the inner side of the first rubber bag 7 that is used first passes gas to the connected pneumatic telescopic rod 14, so that the pneumatic telescopic rod 14 pushes the closing cover 13 corresponding to the other unused second rubber bag 7 to slide open the corresponding ventilation pipe 3, and the other side of the closing cover 13 corresponding to the unused second rubber bag 7 will push the sliding rod to drive the outer sliding rod of the ventilation pipe 3 corresponding to the first rubber bag 7 that has been used, so that this sliding rod pushes the closing cover 13 corresponding to the first rubber bag 7 that is used first, to close the corresponding ventilation pipe 3, and a fixing plate 15 is fixedly connected to the inner side of the fixed box 2, and the setting of the fixing plate 15 The internal air humidity is reduced, and the air is exposed to the atmosphere through the bellows 5, and the heat exchange between the inside and outside of the bellows 5 is continuously performed. When the air is blown back to the inside of the rubber bag 7 through the contraction of the bellows 5, it is helpful to reduce the oil temperature inside the fixing plate 15 and the oil storage tank 1. One surface of the fixing plate 15 faces the direction between the air intake pipe 6 and the bellows 5, and the other side surface of the fixing plate 15 faces the direction between the two ventilation pipes 3. The bottom end of the fixing box 2 is fixedly connected to a water box 16 located below the bottom end of the fixing plate 15, and a switch for releasing water is provided on the outside of the water box 16. After the surface of a rubber bag 7 is cracked, the maintenance personnel can open the outer ventilation valve 4 connected to the ventilation pipe 3 at the top of the rubber bag 7 on the cracked side to extract the air inside the rubber bag 7, further contract the rubber bag 7, and place the rubber bag 7 in a contracted state on the inside of the oil storage tank 1, and the rubber bag 7 used later expands and continues to act on the oil surface, thereby increasing the interval time for replacing the rubber bag 7 once, and avoiding the number of times the internal insulating oil is filtered when the rubber bag 7 is replaced.

[0021] See also Figure 2 The highest point of the bottom end surface of the inner cavity of the fixed bracket 8 is on the same horizontal line as the bottom surface of the inner cavity of the rubber bag 7. The circumferential side surfaces and the top end surface of the fixed bracket 8 are hollow, and the bottom end surface of the fixed bracket 8 as a whole is closed. The fixed bracket 8 has no elasticity, and the fixed bracket 8 will not change its shape due to the contraction of the rubber bag 7. The fixed bracket 8 is always located at the bottom end of the rubber bag 7 due to its own gravity, and the shape of the bottom end of the fixed bracket 8 allows the slider 9 to slide to the lower side to act.

[0022] See also Figure 1 , Figure 2The top surface of the friction rod 11 is rough, and the slider 9 is subjected to the static friction force of the top of the friction rod 11. The slider 9 is stabilized on the bottom surface of the fixed bracket 8. After two rubber bags 7 are connected to the outside of the fixed box 2 through the ventilation pipes 3 in two directions, when the surface of one of the rubber bags 7 used first is cracked, the air inside the rubber bag 7 will pass through the ghost crack holes to age the insulating oil, and the insulating oil on the outside of the rubber bag 7 will penetrate into the inside of the rubber bag 7 through the crack holes, so that the insulating oil flows to the inner bottom end of the fixed bracket 8, so that the insulating oil lubricates the contact surface between the slider 9 and the friction rod 11, so that the slider 9 slides in the direction of the fixed air bag 10 on the inside of the fixed bracket 8 due to its own gravity, and the gravity of the slider 9 The impact force will compress the fixed airbag 10 obliquely, causing the fixed airbag 10 to shrink. The gas inside the fixed airbag 10 is blown to the inside of the pneumatic telescopic rod 14 through the connecting tube 12, causing the pneumatic telescopic rod 14 to extend and push the other rubber bag 7 corresponding to the closing cover 13, causing the closing cover 13 to slide and open the ventilation duct 3. In an instant, the two rubber bags 7 are connected through the fixed box 2. Due to the action of air pressure, the first used rubber bag 7 shrinks, and the rubber particles on the surface of the rubber bag 7 shrink to close the crack hole. The rubber bag 7 that is opened later expands, making the two rubber bags 7 balanced, so that the inside of the rubber bag 7 with the crack hole no longer penetrates into the insulating oil, thereby avoiding aging of the insulating oil due to contact between the aperture and the air, thereby improving the service life.

[0023] See also Figure 1 , Figure 4 The closing cover 13 is inside the fixed box 2. In the initial state, one closing cover 13 closes the ventilation duct 3, and the other closing cover 13 opens the ventilation duct 3. The inner side of the fixed box 2 is fixedly connected with an elastic buckle, and the elastic buckle is located at both ends of the sliding path of the closing cover 13. The closing cover 13 stably closes the ventilation duct 3 through the elastic buckle, and the shape of the closing cover 13 is "L" shaped. One side of the closing cover 13 closes the ventilation duct 3, and the other side of the closing cover 13 is close to the position of the sliding rod. After the first used rubber bag 7 cracks, the closing cover 13 on the outside of the other rubber bag 7 is opened by the connected pneumatic telescopic rod 14, so that the sliding rod is pushed by the closing cover 13 to react, so that the first used rubber bag 7 is closed, so that the other rubber bag 7 continues to work on the rise and fall of the oil level. When the other rubber bag 7 also cracks, the rubber bag 7 is replaced as a whole, so that the time interval for replacing the rubber bag 7 is increased, the number of times the internal insulating oil needs to be filtered due to the replacement of the rubber bag 7 is reduced, the increase in the oil medium loss of the insulating oil is avoided, and the impact of oil cracking on the equipment is alleviated.

[0024] The method of use (working principle) of the present invention is as follows:

[0025] Before the transformer is used, two rubber bags 7 are connected to the inner side of the oil conservator 1, and the top end of the ventilation pipe 3 connected to the top end of one rubber bag 7 is opened by the closing cover 13 and expanded for use, while the top end of the ventilation pipe 3 connected to the other rubber bag 7 is closed by the closing cover 13 and stored inside the oil conservator 1 when not in use.

[0026] When the transformer is in use, the oil level inside the oil storage cabinet 1 drops due to the shrinkage of the insulating oil inside the oil tank due to the cold, the rubber bag 7 expands, and the gas inside the fixed box 2 is blown out to the inside of the rubber bag 7 through the ventilation pipe 3. The telescopic bag 5 at the top of the fixed box 2 shrinks, so that the cold air inside the telescopic bag 5 is blown to the top of the fixed plate 15. When the cold gas inside the fixed box 2 and the telescopic bag 5 is not enough to replenish the gas inside the rubber bag 7, the colder gas in the atmosphere will enter the inside of the fixed box 2 through the desiccant through the air intake pipe 6. At the same time, the incoming gas is first blown to the fixed plate The top of the fixing plate 15 is moved to the top of the fixing plate 15, so that the temperature of the fixing plate 15 is reduced. When the oil level inside the oil storage cabinet 1 rises due to the expansion of the insulating oil inside the oil tank due to heat, the rubber bag 7 shrinks, and the gas inside the rubber bag 7 absorbs the oil heat and is blown out to the inside of the fixing box 2 through the ventilation pipe 3. The hot air is directly blown to the bottom of the fixing plate 15, so that the water vapor in the gas is condensed into water droplets due to condensation, and slides to the bottom of the fixing plate 15 due to its own gravity, and is collected on the inside of the water box 16. At the same time, the telescopic bag 5 at the top of the fixing box 2 is extended to store the blown airflow, and the working process is continued.

[0027] When the surface of the rubber bag 7 is cracked, the rubber bag 7 expands to enlarge the cracked hole, so that the insulating oil on the outside of the rubber bag 7 enters the inside of the rubber bag 7, and the insulating oil slides to the bottom end surface inside the rubber bag 7 due to its own gravity, so that the contact surface between the slider 9 and the friction rod 11 inside the fixed bracket 8 is filled with insulating oil, so that the slider 9 is no longer subject to the friction force of the top surface of the friction rod 11 and slides toward the position where the fixed air bag 10 is located. While sliding, the slider 9 compresses the fixed air bag 10, so that the airflow inside the fixed air bag 10 passes through the connecting pipe 12 and blows to the pneumatic telescopic rod 14 outside the other ventilation pipe 3, so that the pneumatic telescopic rod 14 pushes the closing cover 13 to open the other ventilation pipe 3, instantly making the two connected by the fixed box 2 All ventilation pipes 3 are opened to balance the internal air pressure between the two rubber bags 7, so that the cracked rubber bag 7 shrinks and the cracked aperture is reduced to be closed, so that the two rubber bags 7 work at the same time and push the closing cover 13 on the outside of the other ventilation pipe 3 to close the ventilation pipe 3 connected to the outside of the first used rubber bag 7. At the same time, in the final process of closing the ventilation pipe 3, the connecting pipe 12 corresponding to the cracked rubber bag 7 is also closed, so that the oil level continues to rise and fall through the other rubber bag 7 until this rubber bag 7 also has a cracked state, and the other side rubber bag 7 is opened again. The two rubber bags 7 work together to reduce the expansion volume of the rubber bag 7, waiting for maintenance personnel to replace it.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil pillow for an oil-immersed transformer, comprising an oil storage cabinet (1), characterized in that: The top of the oil storage cabinet (1) is provided with a fixing box (2), the bottom end and one side of the fixing box (2) are respectively fixedly connected to ventilation pipes (3), the outer side of each ventilation pipe (3) is fixedly connected to a ventilation valve (4), the top of the fixing box (2) is fixedly connected to a telescopic bag (5), the other side of the fixing box (2) is fixedly connected to an air intake pipe (6), the bottom end of each ventilation pipe (3) is fixedly connected to a rubber bag (7), the inner bottom end of the rubber bag (7) is fixedly connected to a fixing bracket (8), the bottom end of the inner cavity of the fixing bracket (8) is inclined, and the top of the higher side of the inner cavity of the fixing bracket (8) is fixedly connected to the inner cavity of the fixing bracket (8). The fixed bracket (8) is slidably connected to a slider (9), a fixed airbag (10) is movably connected to the lower side of the inner cavity of the fixed bracket (8), a friction rod (11) located below the slider (9) is fixedly connected to the bottom end of the inner cavity of the fixed bracket (8), the top end of the fixed airbag (10) is fixedly connected to a connecting pipe (12) extending along the inner side of the ventilation pipe (3) to the inside of the fixed box (2), the inside of the fixed box (2) is slidably connected to a closing cover (13) located on one radial side of each ventilation pipe (3), and the top end of the connecting pipe (12) is fixedly connected to a pneumatic telescopic rod (14) located on the other radial side of each ventilation pipe (3); Before the transformer is used, two rubber bags (7) are connected to the inner side of the oil storage cabinet (1), and the top end of the ventilation pipe (3) connected to the top end of one rubber bag (7) is opened by a sealing cover (13) and expanded for use, while the top end of the ventilation pipe (3) connected to the other rubber bag (7) is closed by the sealing cover (13) and is not used and stored inside the oil storage cabinet (1); When the surface of the rubber bag (7) is cracked, the rubber bag (7) expands to enlarge the cracked hole, causing the insulating oil on the outside of the rubber bag (7) to enter the inside of the rubber bag (7). The insulating oil slides to the bottom end surface of the rubber bag (7) due to its own weight, so that the contact surface between the slider (9) on the inside of the fixed bracket (8) and the friction rod (11) is filled with insulating oil, so that the slider (9) is no longer subject to the friction force of the top surface of the friction rod (11) and slides toward the position where the fixed air bag (10) is located. While the slider (9) slides, it compresses the fixed air bag (10), so that the air flow inside the fixed air bag (10) passes through the connecting pipe (12) and blows to the pneumatic telescopic rod (14) on the outside of another ventilation duct (3), so that the pneumatic telescopic rod (14) pushes the closing cover (13) to open the other ventilation duct (3), instantly making the fixed box (2 ) are both opened, so that the internal air pressure between the two rubber bags (7) is balanced, the cracked rubber bag (7) is contracted, and the cracked aperture is reduced to a closed state, so that the two rubber bags (7) act at the same time, and push the closing cover (13) on the outside of the other ventilation pipe (3), so that the ventilation pipe (3) connected to the outside of the first used rubber bag (7) is closed. At the same time, in the final process of closing the ventilation pipe (3), the connecting pipe (12) corresponding to the cracked rubber bag (7) is also closed, so that the oil level continues to rise and fall through the other rubber bag (7), until this rubber bag (7) is also cracked, and the other side rubber bag (7) is opened again, and the two rubber bags (7) work together to reduce the expansion volume of the rubber bag (7) and wait for the maintenance personnel to replace it.

2. The oil pillow for an oil-immersed transformer according to claim 1, characterized in that: A fixing plate (15) is fixedly connected to the inner side of the fixing box (2), one side of the fixing plate (15) faces the direction between the air intake pipe (6) and the telescopic bag (5), and the other side of the fixing plate (15) faces the direction between the two ventilation pipes (3), and the bottom end of the fixing box (2) is fixedly connected to a water storage box (16) located below the bottom end of the fixing plate (15).

3. The oil pillow for an oil-immersed transformer according to claim 1, characterized in that: The highest point of the inner cavity bottom end surface of the fixed bracket (8) is located on the same horizontal line as the inner cavity bottom surface of the rubber bag (7); the circumferential side surface and the top end surface of the fixed bracket (8) are hollowed out, and the bottom end surface of the fixed bracket (8) as a whole is closed.

4. The oil pillow for an oil-immersed transformer according to claim 1, characterized in that: The top end surface of the friction rod (11) is rough, and the slider (9) is subjected to static friction force from the top end of the friction rod (11), so that the slider (9) is stabilized on the bottom end surface of the fixed bracket (8).

5. The oil pillow for an oil-immersed transformer according to claim 1, characterized in that: The inner side of the fixing box (2) is fixedly connected with an elastic buckle, and the elastic buckle is located at both ends of the sliding path of the closing cover (13).

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