Oil-immersed power transformer

Abstract

The invention discloses an oil-immersed power transformer, and relates to the technical field of transformers, the oil-immersed power transformer comprises a transformer main body, an oil conservator is arranged above the transformer main body in a communicating manner, and the oil-immersed power transformer further comprises an oil guide pipe which is located below the oil conservator and is communicated with the interior of the oil conservator; the connecting flange is arranged at the bottom end of the oil guide pipe in a communicating manner; the supporting flange is located below the connecting flange and connected with the connecting flange through bolts. Through cooperative use of a connecting flange, a supporting flange, a glass tube, a protective tube, a fixing sleeve and a movable seat, when the movable seat is in a first state, moisture in air is absorbed by moisture absorption silica gel balls in a first moisture absorption cavity, and when the water absorption capacity of the moisture absorption silica gel balls in the first moisture absorption cavity is reduced or even fails, the moisture absorption silica gel balls in the first moisture absorption cavity can absorb moisture in the air. And the movable seat is adjusted to the second state, the air enters the second moisture absorption cavity, moisture absorption silica gel balls in the second moisture absorption cavity absorb moisture of the air passing through the first moisture absorption cavity, and it is ensured that the air is in a dry state.

Description

Technical Field

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

[0002] The oil-immersed transformer is a new type of high-performance transformer with a more reasonable structure and better performance. Its three-dimensional wound core has three core columns arranged in an equilateral triangle, with no air gap in the magnetic circuit, tighter winding, and the three magnetic circuits are of the same length and the shortest. The cross-sectional area of ​​the core column is closer to a circle, so the performance is further improved, the loss is reduced, the noise is reduced, the three items are balanced, and the third harmonic component is reduced. This product is more suitable for urban and rural, industrial and mining enterprise power grid transformation, and is more suitable for combined transformers and prefabricated substation transformers.

[0003] Usually, oil-immersed transformers use external oil corrugated oil pillows. The oil outside the corrugated expansion core is directly connected to and shared with the transformer insulating oil. When the volume of the transformer insulating oil expands or decreases with the temperature of the oil, the volume of the corrugated expansion core will shrink or increase under the action of the oil pressure, thereby ensuring that the transformer oil tank is always full of oil. The oil pillow is generally equipped with a respirator, which is used to adjust the air pressure in the oil tank and remove impurities and moisture in the inhaled air. When the transformer expands due to heat, excess air is discharged through the respirator; when the transformer oil temperature decreases and contracts, external air is inhaled. In this process, the silica gel in the respirator absorbs moisture in the air to keep the transformer oil dry.

[0004] For example, a transformer dehumidifier with a stirring device, which is disclosed in CN108695041A, comprises a transparent bottle body equipped with a desiccant, the top cover of the bottle body is fastened by fixing bolts and a flange, the neck of the bottle body is provided with a connecting through hole with a plug, a stirring device is provided between the flange and the top cover in the vertical direction, the stirring device is composed of a turntable, a stirring shaft and a spiral stirring blade, the lower end face of the turntable and the upper end face of the flange are against each other, the stirring shaft is fixed to the lower end face of the turntable, and the spiral stirring blade is sleeved on the outer surface of the stirring shaft. The above scheme has a simple structure, and by providing a stirring device in the bottle body, the desiccant in each place of the bottle body can fully contact with impurities and moisture, and the absorption is more sufficient; stirring can be conveniently performed without opening the bottle cap, and it is easy to operate.

[0005] Although the above technical solution can make the desiccant in each place of the bottle body fully contact with impurities and moisture through the stirring device, and absorb more fully, after long-term use, the desiccant's ability to absorb moisture in the air will gradually decrease or even fail. Moreover, when the temperature of the transformer is too high, it may cause oil overflow and contaminate the desiccant. After the above situation occurs, the desiccant needs to be replaced, otherwise the failed or contaminated desiccant will not be able to guarantee the dryness and cleanliness of the air. When the desiccant is replaced, the respirator cannot be used normally, which is easy to affect the stable operation of the transformer.

[0006] Therefore, it is necessary to invent an oil-immersed power transformer to solve the above problems. Summary of the invention

[0007] The object of the present invention is to provide an oil-immersed power transformer to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an oil-immersed power transformer, comprising a transformer body, an oil pillow is connected to the upper part of the transformer body, and also comprising: an oil guide pipe, which is located below the oil pillow and communicated with the inside of the oil pillow; a connecting flange, which is connected and arranged at the bottom end of the oil guide pipe; a supporting flange, which is located below the connecting flange and connected to the connecting flange by bolts; a glass tube, which is sealed and arranged between the connecting flange and the supporting flange, and a first moisture absorption cavity for placing a moisture-absorbing silica gel ball is arranged inside the glass tube; a protective tube, which is sealed and arranged between the connecting flange and the supporting flange, and is located on the outside of the glass tube, and a chamber is formed between the protective tube and the glass tube; a fixing sleeve, which is located below the supporting flange and is sealed and connected to the supporting flange by bolts, and a second moisture absorption cavity for placing a moisture-absorbing silica gel ball is arranged inside the glass tube; an oil cup, which is sealed and arranged below the fixing sleeve; an oil pipe, which is arranged through the inside of the supporting flange and the fixing sleeve, the top end of the oil pipe is connected to the bottom end of the connecting flange, and the bottom end of the oil pipe is arranged inside the oil cup.

[0009] Preferably, it also includes: a first air inlet hole, which is provided with a plurality of holes and is opened through the middle of the supporting flange, and the plurality of first air inlet holes are all located inside the chamber; a first flow guide hole, which is provided with a plurality of holes and is opened through the top of the side wall of the glass tube; a movable seat, which is rotatably arranged inside the fixed sleeve, and there is a gap for gas to pass between the middle of the movable seat and the oil pipe; a plurality of air guide holes, which are provided with a plurality of holes and are opened through the upper and lower ends of the movable seat; a plurality of air guide pipes, which are provided with a plurality of holes and are fixedly arranged inside the movable seat, and each air guide pipe is connected to the corresponding upper and lower air guide holes; a first connecting air pipe, which is provided with a plurality of holes and is opened through the upper and lower ends of the movable seat; The first connecting air pipe is penetrated through the middle part of the supporting flange, and the upper end of the first connecting air pipe is connected to the interior of the first moisture absorption chamber, and the lower end is connected to the interior of the second moisture absorption chamber; the second connecting air pipe is provided with multiple and is penetrated through the bottom of the fixed sleeve, the upper end of the second connecting air pipe is connected to the interior of the second moisture absorption chamber, and the lower end is connected to the interior of the oil cup, and the second connecting air pipe corresponds to the first connecting air pipe up and down; the ventilation holes are provided with multiple and are penetrated through the upper and lower ends of the movable seat, the ventilation holes and the air guide holes are alternately arranged, and when the movable seat rotates, the air guide holes and the ventilation holes can be alternately connected with the first connecting air pipe and the second connecting air pipe.

[0010] Preferably, it also includes: a second air inlet hole, which is provided in plurality and is opened through the top of the side wall of the fixed sleeve; a retaining ring, which is fixedly arranged on the top of the movable seat and sealingly fits with the inner wall of the fixed sleeve; a second flow guide hole, which is provided in plurality and is opened through the side wall of the retaining ring, and when the retaining ring rotates, the second air inlet hole can be connected with the second flow guide hole.

[0011] Preferably, it also includes: an adjusting motor, which is fixedly arranged on the outside of the fixing sleeve, and its output end passes through the inside of the fixing sleeve; an adjusting gear, which is arranged inside the fixing sleeve and fixedly connected to the output end of the adjusting motor; and a gear ring, which is fixedly arranged at the bottom of the movable seat and meshes with the adjusting gear.

[0012] Preferably, it also includes: a filter screen, which is arranged inside the first moisture absorption cavity and located outside the plurality of first connecting air pipes; and a positioning nut, which is arranged at the top of the filter screen and is threadedly connected to the oil pipe.

[0013] Preferably, it also includes: a first feeding port, which is connected to the top of the connecting flange; a first discharging port, which is connected to the bottom of the side wall of the glass tube and passes through the outside of the protective tube; a second feeding port, which is connected to the top of the side wall of the fixing sleeve; and a second discharging port, which is connected to the bottom of the side wall of the fixing sleeve.

[0014] Preferably, it also includes: a protective cover, which is located on the outside of the oil cup and is used to limit the position of the oil cup; a connecting ring, which is located at the top of the protective cover; a connecting groove, which is provided at the bottom end of the fixing sleeve, and the connecting ring is installed inside the connecting groove through threads.

[0015] Preferably, the oil pipe is provided with multiple sections, the multiple sections of the oil pipe are respectively arranged in the middle of the supporting flange and the fixing sleeve, and the multiple sections of the oil pipe are connected to each other by plugging.

[0016] Preferably, a disc is provided at the bottom end of the oil pipe, and the disc is arranged inside the oil cup, and the disc is used to guide the air in the cooling oil to form bubbles and discharge.

[0017] Preferably, an observation window is provided in the middle of the protection tube.

[0018] Technical effects and advantages of the present invention: 1. The present invention cooperates with the use of a connecting flange, a supporting flange, a glass tube, a protective tube, a fixed sleeve and a movable seat. When the movable seat is in a first state, the hygroscopic silica gel balls in the first hygroscopic cavity absorb moisture in the air. When the water absorption capacity of the hygroscopic silica gel balls in the first hygroscopic cavity is reduced or even fails, the movable seat is adjusted to a second state, and the air enters the second hygroscopic cavity. The hygroscopic silica gel balls in the second hygroscopic cavity absorb moisture from the air after passing through the first hygroscopic cavity, thereby ensuring that the air is in a dry state.

[0019] 2. The present invention adjusts the movable seat to the second state, so that the hygroscopic silica gel balls in the second hygroscopic chamber can absorb moisture from the air passing through the first hygroscopic chamber while replacing the hygroscopic silica gel balls in the first hygroscopic chamber, thereby restoring the hygroscopic air absorption capacity of the first hygroscopic chamber, and realizing the replacement of the hygroscopic silica gel balls in the first hygroscopic chamber without stopping the machine, thereby ensuring the normal and continuous operation of the transformer.

[0020] 3. The present invention uses the second air inlet hole, the baffle ring and the second guide hole in coordination. When the oil overflows into the first moisture absorption chamber and pollutes the moisture absorption silica gel balls in the first moisture absorption chamber, the movable seat is adjusted to the third state, so that the external air directly enters the second moisture absorption chamber for moisture absorption, and the moisture absorption silica gel balls in the first moisture absorption chamber are prevented from polluting the air. Even if the transformer overflows oil, the air can still be effectively absorbed, ensuring that the air subsequently entering the oil cup is in a dry and clean state, thereby ensuring the insulation performance of the transformer; and, since the first moisture absorption chamber does not participate in the moisture absorption operation of the air at this time, the moisture absorption silica gel balls in the first moisture absorption chamber can be replaced at the same time.

[0021] 4. The present invention adjusts the movable seat to different states so that the transformer has multiple ways to absorb moisture from the air, thereby ensuring the absorption effect of moisture in the air. At the same time, by adjusting the movable seat to different states, the hygroscopic silica gel ball in the first hygroscopic chamber or the second hygroscopic chamber can be replaced when the respirator is working normally, thereby ensuring continuous and stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1It is a schematic diagram of the overall structure of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the connecting flange and the supporting flange of the present invention.

[0024] Figure 3 It is a schematic diagram of the cross-sectional structure of the connecting flange and the supporting flange of the present invention.

[0025] Figure 4 It is a schematic diagram of the positions of the first air inlet and the first air guide hole of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the filter screen of the present invention.

[0027] Figure 6 It is a structural schematic diagram of the fixing sleeve of the present invention.

[0028] Figure 7 It is a structural schematic diagram of the movable seat of the present invention.

[0029] Figure 8 It is a schematic diagram of the explosion structure of the oil cup and the fixing sleeve of the present invention.

[0030] Fig. 9 It is a schematic structural diagram of the supporting flange and the fixing sleeve of the present invention.

[0031] Fig.10 For the present invention Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0032] Fig.11 For the present invention Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0033] Fig.12 It is a schematic diagram of the first state of the movable seat of the present invention.

[0034] Fig.13 It is a schematic diagram of the second state of the movable seat of the present invention.

[0035] Fig.14 It is a schematic diagram of the third state of the movable seat of the present invention.

[0036] In the figure: 1. transformer body; 2. oil pillow; 3. oil guide pipe; 4. connecting flange; 5. supporting flange; 51. first air inlet; 52. first flow guide hole; 53. filter screen; 54. positioning nut; 6. glass tube; 61. protective tube; 62. chamber; 63. first feeding port; 64. first discharge port; 65. observation window; 7. fixing sleeve; 71. movable seat; 72. air guide hole; 73. air guide pipe; 74. first connecting air pipe; 75. second connecting air pipe; 76. ventilation hole; 77. second air inlet; 78. retaining ring; 79. second flow guide hole; 710. adjusting motor; 711. adjusting gear; 712. gear ring; 713. second feeding port; 714. second discharge port; 8. oil cup; 81. protective cover; 82. connecting ring; 83. connecting groove; 9. oil pipe; 91. disc. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] The present invention provides Figures 1 to 14 An oil-immersed power transformer shown in the figure comprises a transformer body 1, a channel for cooling oil circulation is provided inside the transformer body 1, an oil pillow 2 is provided above the transformer body 1, and the oil pillow 2 is connected to the cooling oil channel inside the transformer body 1, and further comprises: The oil guide pipe 3 is located below the oil pillow 2 and communicated with the interior of the oil pillow 2 .

[0040] The connecting flange 4 is connected to the bottom end of the oil guide pipe 3 , and the connecting flange 4 is connected to the oil pillow 2 through the oil guide pipe 3 .

[0041] Specifically, a first feeding port 63 is provided on the top of the connecting flange 4 , and hygroscopic silica gel balls can be added into the first hygroscopic cavity through the first feeding port 63 .

[0042] The supporting flange 5 is located below the connecting flange 4 and is connected to the connecting flange 4 by bolts.

[0043] The glass tube 6 is sealed between the connecting flange 4 and the supporting flange 5, and a first moisture absorption cavity for placing moisture absorption silica gel balls is provided inside the glass tube 6.

[0044] Specifically, a filter 53 is provided inside the first moisture absorption chamber, which is located on the outside of the multiple first connecting air pipes 74 and is configured as a conical structure to increase the contact area between the moisture absorption silica gel ball and the filter 53, thereby achieving the effect of improving the efficiency of air passing through the first moisture absorption chamber.

[0045] More specifically, a positioning nut 54 threadedly connected to the oil pipe 9 is provided at the top of the filter screen 53 , and the positioning nut 54 is used to limit and fix the filter screen 53 .

[0046] The protection tube 61 is sealed and disposed between the connecting flange 4 and the supporting flange 5 and is located outside the glass tube 6 . A chamber 62 is formed between the protection tube 61 and the glass tube 6 .

[0047] Specifically, the bottom of the side wall of the glass tube 6 is connected to a first discharge port 64 that penetrates to the outside of the protective tube 61 , and the failed hygroscopic silica gel balls can be easily taken out from the first hygroscopic cavity through the first discharge port 64 .

[0048] More specifically, an observation window 65 is provided in the middle of the protection tube 61, and the observation window 65 is used to observe whether the hygroscopic silica gel ball changes color so as to judge whether the hygroscopic silica gel ball needs to be replaced.

[0049] The fixing sleeve 7 is located below the supporting flange 5 and is sealed with the supporting flange 5 by bolts, and a second moisture absorption cavity for placing moisture absorption silica gel balls is provided inside the fixing sleeve 7.

[0050] Specifically, a second feeding port 713 is provided at the top end of the side wall of the fixed sleeve 7, and hygroscopic silica gel balls can be added into the second hygroscopic cavity through the second feeding port 713. A second discharge port 714 is provided at the bottom end of the side wall of the fixed sleeve 7, and expired hygroscopic silica gel balls can be easily removed from the second hygroscopic cavity through the second discharge port 714.

[0051] The oil cup 8 is sealingly arranged below the fixed sleeve 7 .

[0052] Specifically, a protective cover 81 is provided on the outside of the oil cup 8, a connecting ring 82 is provided on the top of the protective cover 81, a connecting groove 83 is provided on the bottom end of the fixing sleeve 7, and the connecting ring 82 is installed inside the connecting groove 83 by threads. The protective cover 81 can limit and protect the oil cup 8 to prevent damage to the oil cup 8 caused by external collisions. The connecting ring 82 and the connecting groove 83 cooperate with each other to facilitate the disassembly and assembly of the oil cup 8.

[0053] More specifically, an oil overflow monitoring alarm is provided inside the oil cup 8, which can monitor the oil in the oil cup 8 and promptly issue an alarm when there is too much oil in the oil cup 8 and it overflows upward. The oil overflow monitoring alarm is a prior art and will not be described in detail here and is not shown in the figure.

[0054] The oil pipe 9 is arranged to penetrate the inside of the supporting flange 5 and the fixing sleeve 7 , the top end of the oil pipe 9 is connected with the bottom end of the connecting flange 4 , and the bottom end of the oil pipe 9 is arranged inside the oil cup 8 .

[0055] Specifically, the oil pipe 9 is provided with multiple sections, and the multiple sections of the oil pipe 9 are respectively arranged in the middle of the supporting flange 5 and the fixing sleeve 7, and the multiple sections of the oil pipe 9 are connected to each other by plugging.

[0056] More specifically, a disc 91 is provided at the bottom end of the oil pipe 9, and the disc 91 is arranged inside the oil cup 8. The disc 91 is used to guide the air in the cooling oil to form bubbles and discharge.

[0057] A plurality of first air inlet holes 51 are provided and are opened through the middle of the supporting flange 5 . The plurality of first air inlet holes 51 are all located inside the chamber 62 .

[0058] A plurality of first flow guide holes 52 are provided and are opened through the top of the side wall of the glass tube 6 .

[0059] The movable seat 71 is rotatably disposed inside the fixed sleeve 7 , and a gap for gas to pass through exists between the middle of the movable seat 71 and the oil pipe 9 .

[0060] Specifically, an adjusting motor 710 is provided on the outer side of the fixed sleeve 7, and its output end passes through the interior of the fixed sleeve 7; the output end of the adjusting motor 710 is fixedly connected to an adjusting gear 711 located inside the fixed sleeve 7, and a gear ring 712 is fixedly provided on the bottom of the movable seat 71, and the gear ring 712 is meshed with the adjusting gear 711; the adjusting motor 710 can drive the movable seat 71 to rotate through the adjusting gear 711 and the gear ring 712, wherein the adjusting motor 710 is a forward and reverse stepping motor, and by controlling the adjusting motor 710, the movable seat 71 can be adjusted to rotate forward or reverse at a specific angle.

[0061] A plurality of air guide holes 72 are provided and are opened through the upper and lower ends of the movable seat 71 .

[0062] There are multiple air guide tubes 73 fixedly disposed inside the movable seat 71 , and each air guide tube 73 is connected to the corresponding upper and lower air guide holes 72 .

[0063] A first connecting air pipe 74, which is provided in plurality and is arranged through the middle of the supporting flange 5, wherein the upper end of the first connecting air pipe 74 is connected to the interior of the first moisture absorption chamber, and the lower end of the first connecting air pipe 74 is connected to the interior of the second moisture absorption chamber; The second connecting air pipe 75 is provided in plurality and is arranged through the bottom of the fixed sleeve 7 . The upper end of the second connecting air pipe 75 is connected to the inside of the second moisture absorption chamber, and the lower end is connected to the inside of the oil cup 8 . The second connecting air pipe 75 corresponds to the first connecting air pipe 74 in upper and lower directions.

[0064] There are multiple ventilation holes 76 that penetrate through the upper and lower ends of the movable seat 71. The ventilation holes 76 and the air guide holes 72 are alternately arranged. When the movable seat 71 rotates, the air guide holes 72 and the ventilation holes 76 can be alternately connected to the first connecting air pipe 74 and the second connecting air pipe 75.

[0065] A plurality of second air inlet holes 77 are provided and are opened through the top of the side wall of the fixing sleeve 7 .

[0066] The retaining ring 78 is fixedly disposed on the top of the movable seat 71 and is sealingly fitted with the inner wall of the fixed sleeve 7 . The retaining ring 78 can rotate relative to the fixed sleeve 7 following the movable seat 71 .

[0067] The second guide holes 79 are provided in plurality and penetrate through the side wall of the retaining ring 78 . When the retaining ring 78 rotates, the second air inlet hole 77 can be connected to the second guide holes 79 .

[0068] It should be noted that the rotation state of the fixed sleeve 7 can be adjusted by controlling the adjustment motor 710. When the adjustment motor 710 is not adjusted, that is, when the adjustment motor 710 is in the initial state, the movable seat 71 is in the first state. Fig.12 As shown, at this time, the first connecting air pipe 74 is connected to the upper air guide hole 72, and is connected to the second connecting air pipe 75 through the air guide pipe 73 and the lower air guide hole 72. The second air inlet hole 77 is not connected to the second guide hole 79, and the blocking ring 78 blocks the second air inlet hole 77.

[0069] When the movable seat 71 is driven to rotate counterclockwise by a specific angle relative to its initial state by adjusting the motor 710, the movable seat 71 is in the second state, such as Fig.13 As shown, at this time, the first connecting air pipe 74 is connected to the upper air exchange hole 76, the lower air exchange hole 76 is connected to the second connecting air pipe 75, the second air inlet hole 77 is not connected to the second guide hole 79, and the blocking ring 78 blocks the second air inlet hole 77.

[0070] When the movable seat 71 is driven to rotate clockwise by a specific angle relative to its initial state by adjusting the motor 710, the movable seat 71 is in the third state, such as Fig.14 As shown, at this time, the second air inlet hole 77 is connected to the second guide hole 79, the retaining ring 78 no longer blocks the second air inlet hole 77, the first connecting air pipe 74 is connected to the upper air exchange hole 76, and the lower air exchange hole 76 is connected to the second connecting air pipe 75.

[0071] When the transformer is in use, the oil in the oil pillow 2 can circulate inside the transformer body 1 to achieve the heat dissipation and cooling effect of the transformer body 1; when the temperature inside the transformer body 1 decreases, the volume of the oil inside it shrinks, the oil in the oil pillow 2 enters the transformer body 1, and the pressure inside the oil pillow 2 decreases. At this time, the movable seat 71 is in the first state, and the first air inlet hole 51, the chamber 62 and the first guide hole 52 of the external air enter the first moisture absorption cavity. The moisture absorption silica gel ball in the first moisture absorption cavity absorbs the moisture in the air, and the filter 53 filters the impurities in the air. The air after moisture absorption and filtration passes through the first connecting air pipe 74, the upper air guide hole 72, the air guide pipe 73, the lower air guide hole 72 and the second connecting air pipe 75 in turn to enter the oil cup 8, and then enters the oil pillow 2 through the oil pipe 9 and the oil guide pipe 3, so as to ensure the pressure balance between the oil pillow 2 and the transformer body 1. In this process, the moisture absorption silica gel ball in the second moisture absorption cavity does not participate in the moisture absorption operation.

[0072] As the hygroscopic silica gel balls in the first hygroscopic chamber are used for a long time, their water absorption capacity will gradually decrease or even fail. The air after passing through the first hygroscopic chamber cannot meet the hygroscopic standard. At this time, the movable seat 71 is driven to rotate counterclockwise by a specific angle relative to its initial state by adjusting the motor 710, so that the movable seat 71 is in the second state. The air after passing through the first hygroscopic chamber enters the second hygroscopic chamber through the first connecting air pipe 74 and the upper air guide hole 72. The hygroscopic silica gel balls in the second hygroscopic chamber absorb the moisture in the air. The air after hygroscopic absorption enters the oil cup 8 through the lower air guide hole 72 and the second connecting air pipe 75, and then enters the oil pillow 2 through the oil pipe 9 and the oil guide pipe 3, so as to ensure the pressure balance between the oil pillow 2 and the transformer body 1. In addition, during this process, the failed hygroscopic silica gel balls in the first hygroscopic chamber can be taken out through the first discharge port 64, and new hygroscopic silica gel balls can be added to the first hygroscopic chamber through the first feeding port 63.

[0073] When the temperature inside the transformer body 1 rises, the volume of the oil inside it expands, and the excess oil enters the oil pillow 2, so that the oil and air in the oil pillow 2 enter the oil cup 8 through the oil guide pipe 3 and the oil pipe 9. At this time, the movable seat 71 is in the first state, and the excess gas in the oil cup 8 is discharged to the outside through the second connecting air pipe 75, the lower air guide hole 72, the air guide pipe 73, the upper air guide hole 72, the first connecting air pipe 74, the first guide hole 52, the chamber 62 and the first air inlet hole 51 in sequence, so as to ensure the pressure balance between the oil pillow 2 and the transformer body 1.

[0074] When the temperature of the transformer body 1 is too high, excess oil will fill the oil cup 8 and overflow into the first moisture absorption chamber, polluting the moisture absorption silica gel balls in the first moisture absorption chamber. The contaminated moisture absorption silica gel balls will lose their moisture absorption ability and will pollute the air passing through them. In this process, since the movable seat 71 is in the first state, the oil will only overflow into the first moisture absorption chamber and will not pollute the moisture absorption silica gel balls in the second moisture absorption chamber. Based on this, when the temperature of the transformer body 1 drops again and the oil cup 8 needs to be inflated, the air can no longer be absorbed by the moisture absorption silica gel balls in the first moisture absorption chamber. Otherwise, the contaminated air will enter the oil pillow 2 and damage the transformer. At this time, by adjusting The energy-saving motor 710 drives the movable seat 71 to rotate clockwise by a specific angle relative to its initial state, so that the movable seat 71 is in the third state, and the external air enters the second moisture absorption chamber through the second air inlet hole 77 and the second guide hole 79, and the moisture absorption silica gel ball in the second moisture absorption chamber absorbs the moisture in the air. The air after moisture absorption enters the oil cup 8 through the lower air guide hole 72 and the second connecting air pipe 75, and then enters the oil pillow 2 through the oil pipe 9 and the oil guide pipe 3, so as to ensure the pressure balance between the oil pillow 2 and the transformer body 1. In this process, the moisture absorption silica gel ball in the first moisture absorption chamber does not participate in the moisture absorption operation, and the moisture absorption silica gel ball in the first moisture absorption chamber can be replaced while the second moisture absorption chamber is absorbing moisture for the air.

[0075] Through the coordinated use of the connecting flange 4, the supporting flange 5, the glass tube 6, the protective tube 61, the fixed sleeve 7 and the movable seat 71, during normal use, the movable seat 71 is in the first state, and the hygroscopic silica gel balls in the first hygroscopic cavity absorb the moisture in the air, so that the air enters the oil cup 8 in a dry state. When the hygroscopic silica gel balls in the first hygroscopic cavity are used for a long time, their water absorption capacity will gradually decrease or even fail, and the movable seat 71 is adjusted to the second state. At this time, the air passing through the first hygroscopic cavity enters the second hygroscopic cavity, and the hygroscopic silica gel balls in the second hygroscopic cavity absorb the moisture in the air, ensuring that the air is in a dry state, thereby ensuring the insulation strength of the transformer.

[0076] By adjusting the movable seat 71 to the second state, while the hygroscopic silica gel balls in the second hygroscopic chamber absorb moisture from the air passing through the first hygroscopic chamber, the failed hygroscopic silica gel balls in the first hygroscopic chamber can be taken out through the first discharge port 64, and new hygroscopic silica gel balls can be added to the first hygroscopic chamber through the first feeding port 63, so as to restore the absorption capacity of the first hygroscopic chamber for moisture in the air, thereby realizing the replacement of the hygroscopic silica gel balls in the first hygroscopic chamber without stopping the machine, thereby ensuring the normal and continuous operation of the transformer.

[0077] Through the coordinated use of the second air inlet 77, the retaining ring 78 and the second guide hole 79, when the temperature of the transformer body 1 is too high and the excess oil fills the oil cup 8 and overflows into the first moisture absorption chamber, causing pollution to the moisture absorption silica gel balls in the first moisture absorption chamber, the movable seat 71 is adjusted to the third state, so that the external air directly enters the second moisture absorption chamber through the second air inlet 77 and the second guide hole 79, and the moisture absorption silica gel balls in the second moisture absorption chamber absorb the moisture in the air. During this process, the air does not contact the inside of the first moisture absorption chamber, so the moisture absorption silica gel balls in the first moisture absorption chamber can be prevented from polluting the air, so that even if the transformer causes oil overflow from the oil cup 8 due to excessive temperature, the air can still be effectively absorbed and dried, ensuring that the air entering the oil cup 8 when the transformer temperature is lowered is in a dry and clean state, thereby avoiding damage to the transformer and ensuring the insulation performance of the transformer; and, since the first moisture absorption chamber does not participate in the moisture absorption operation of the air at this time, the moisture absorption silica gel balls in the first moisture absorption chamber can be replaced while the second moisture absorption chamber is absorbing moisture from the air.

[0078] By adjusting the movable seat 71 to different states, the moisture in the air can be absorbed by the hygroscopic silica gel balls in the first hygroscopic chamber alone, the moisture in the air can be absorbed by the hygroscopic silica gel balls in the second hygroscopic chamber alone, and the moisture in the air can be absorbed by the hygroscopic silica gel balls in the first hygroscopic chamber and the second hygroscopic chamber at the same time, thereby ensuring the absorption effect of moisture in the air. At the same time, by adjusting to different states, the hygroscopic silica gel balls in the first hygroscopic chamber or the second hygroscopic chamber can be replaced without stopping the machine, thereby ensuring continuous and stable operation.

[0079] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-immersed power transformer, comprising a transformer body (1), an oil pillow (2) being arranged above the transformer body (1), characterized in that: Also includes: An oil guide pipe (3) located below the oil pillow (2) and connected to the interior of the oil pillow (2); A connecting flange (4) which is connected to the bottom end of the oil guide pipe (3); A supporting flange (5), which is located below the connecting flange (4) and is connected to the connecting flange (4) by bolts; A glass tube (6) is sealed and arranged between the connecting flange (4) and the supporting flange (5), and a first moisture absorption cavity for accommodating a moisture absorption silica gel ball is provided inside the glass tube; A protective tube (61) is sealingly disposed between the connecting flange (4) and the supporting flange (5) and is located outside the glass tube (6); a chamber (62) is formed between the protective tube (61) and the glass tube (6); A fixing sleeve (7), which is located below the supporting flange (5) and is sealed with the supporting flange (5) by bolts, and is provided with a second moisture absorption cavity for accommodating a moisture absorption silica gel ball; An oil cup (8) which is sealingly arranged below the fixed sleeve (7); An oil pipe (9) is arranged to penetrate the interior of the supporting flange (5) and the fixing sleeve (7), the top end of the oil pipe (9) is connected to the bottom end of the connecting flange (4), and the bottom end of the oil pipe (9) is arranged inside the oil cup (8).

2. The oil-immersed power transformer according to claim 1, characterized in that: Also includes: A plurality of first air inlet holes (51) are provided and are opened through the middle of the supporting flange (5), and the plurality of first air inlet holes (51) are all located inside the chamber (62); A plurality of first flow guide holes (52) are provided and are opened through the top of the side wall of the glass tube (6); A movable seat (71) is rotatably arranged inside the fixed sleeve (7), and a gap for gas to pass through is provided between the middle of the movable seat (71) and the oil pipe (9); A plurality of air guide holes (72) are provided and are opened through the upper and lower ends of the movable seat (71); A plurality of air guide tubes (73) are provided and fixedly arranged inside the movable seat (71), and each air guide tube (73) is connected to the corresponding upper and lower air guide holes (72); A first connecting air pipe (74), which is provided in plurality and is arranged through the middle of the supporting flange (5), wherein the upper end of the first connecting air pipe (74) is connected to the interior of the first moisture absorption chamber, and the lower end is connected to the interior of the second moisture absorption chamber; A plurality of second connecting air pipes (75) are provided and are arranged through the bottom of the fixed sleeve (7); the upper end of the second connecting air pipe (75) is connected to the interior of the second moisture absorption cavity, and the lower end is connected to the interior of the oil cup (8); and the second connecting air pipe (75) corresponds to the first connecting air pipe (74) in upper and lower positions; A plurality of ventilation holes (76) are provided and are opened through the upper and lower ends of the movable seat (71). The ventilation holes (76) and the air guide holes (72) are alternately arranged. When the movable seat (71) rotates, the air guide holes (72) and the ventilation holes (76) can be alternately connected to the first connecting air pipe (74) and the second connecting air pipe (75).

3. An oil-immersed power transformer according to claim 2, characterized in that: Also includes: A plurality of second air inlet holes (77) are provided and are opened through the top of the side wall of the fixing sleeve (7); A retaining ring (78) is fixedly disposed on the top of the movable seat (71) and is sealingly fitted to the inner wall of the fixed sleeve (7); The second guide holes (79) are provided in plurality and penetrate the side wall of the retaining ring (78). When the retaining ring (78) rotates, the second air inlet hole (77) can be connected to the second guide holes (79).

4. The oil-immersed power transformer according to claim 3, characterized in that: Also includes: An adjusting motor (710) is fixedly arranged on the outside of the fixing sleeve (7), and an output end thereof penetrates into the inside of the fixing sleeve (7); An adjusting gear (711), which is arranged inside the fixing sleeve (7) and fixedly connected to the output end of the adjusting motor (710); The gear ring (712) is fixedly disposed on the bottom of the movable seat (71) and meshes with the adjusting gear (711).

5. The oil-immersed power transformer according to claim 4, characterized in that: Also includes: A filter screen (53) disposed inside the first moisture absorption chamber and outside the plurality of first connecting air pipes (74); A positioning nut (54) is arranged on the top end of the filter screen (53) and is threadedly connected to the oil pipe (9).

6. The oil-immersed power transformer according to claim 1, characterized in that: Also includes: A first feeding port (63) connected to the top of the connecting flange (4); A first discharge port (64) which is connected to the bottom of the side wall of the glass tube (6) and penetrates to the outside of the protective tube (61); A second feeding port (713) which is connected to the top end of the side wall of the fixing sleeve (7); The second discharge port (714) is communicated with the bottom end of the side wall of the fixing sleeve (7).

7. The oil-immersed power transformer according to claim 1, characterized in that: Also includes: A protective cover (81) located outside the oil cup (8) and used to limit the position of the oil cup (8); A connecting ring (82) located at the top of the protective cover (81); A connecting groove (83) is provided at the bottom end of the fixing sleeve (7), and the connecting ring (82) is installed inside the connecting groove (83) via threads.

8. The oil-immersed power transformer according to claim 1, characterized in that: The oil pipe (9) is provided with a plurality of sections, the plurality of sections of the oil pipe (9) are respectively arranged at the middle of the supporting flange (5) and the fixing sleeve (7), and the plurality of sections of the oil pipe (9) are connected to each other by plugging.

9. The oil-immersed power transformer according to claim 1, characterized in that: A disc (91) is provided at the bottom end of the oil pipe (9), and the disc (91) is arranged inside the oil cup (8). The disc (91) is used to guide the air in the cooling oil to form bubbles for discharge.

10. The oil-immersed power transformer according to claim 1, characterized in that: An observation window (65) is provided in the middle of the protection tube (61).

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