Oil-immersed distribution transformer

Abstract

The invention discloses an oil-immersed distribution transformer, and relates to the technical field of distribution transformers, the oil-immersed distribution transformer comprises a distribution transformer body, the inner side of the distribution transformer body is provided with a heat exchange oil pipe, the left end of the heat exchange oil pipe is connected with a backflow oil pipe, and the upper end of the backflow oil pipe is provided with an oil tank located above a sealing top cover; and a high-voltage bushing and a low-voltage bushing are respectively arranged at the upper end of the sealing top cover. The problems that due to the fact that the transformer is mainly installed outdoors, especially in a place with a poor environment, and more and more dust impurities exist in air in recent years, internal parts of the transformer are damaged after the transformer is used for a long time, meanwhile, due to interference of dust, a filter screen is blocked, the temperature in the transformer rises accordingly, and the transformer is damaged are solved. The problems that the service life of parts of the transformer is influenced, and the bursting degree of the transformer during working is aggravated along with continuous troubles of high temperature, and unnecessary loss is caused are solved.

Description

Technical Field

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

[0002] Oil-immersed distribution transformers are key equipment for voltage conversion and power distribution in power systems. They have the characteristics of good heat dissipation performance, strong overload capacity, and long service life. Among them, oil-immersed transformers are a type of transformer that uses petroleum liquid as a sealing and heat-conducting medium. Compared with dry-type transformers, oil-immersed transformers have low costs. Due to the protective effect of transformer oil, the heat working inside the oil-immersed transformer is not easy to accumulate, which facilitates the heat dissipation of the transformer. At the same time, its internal coils and other working structures are not easily oxidized due to high temperature during operation, and the cost of use is much lower than that of dry-type transformers.

[0003] Compared with the existing distribution transformers, there are still the following defects: since the transformers are mainly installed outdoors, especially in places with poor environments, and the dust impurities in the air have increased in recent years, the transformers will be damaged after long-term use. At the same time, under the interference of dust, the filter will be clogged, which will cause the temperature inside the transformer to rise, thereby affecting the life of the transformer components. Moreover, with the continuous trouble of high temperature, the degree of explosion of the transformer during operation will be aggravated, causing unnecessary losses. Summary of the Invention

[0004] The purpose of the present invention is to provide an oil-immersed distribution transformer to solve the following technical problems: Since transformers are mainly installed outdoors, especially in places with poor environments, and since there has been an increasing amount of dust and impurities in the air in recent years, the transformer will be damaged due to long-term use of the internal components. At the same time, the interference of dust will cause the filter to be clogged, which will increase the temperature inside the transformer, thereby affecting the life of the transformer components. In addition, as the high temperature continues to cause problems, the degree of explosion during operation of the transformer will be aggravated, causing unnecessary losses.

[0005] The purpose of the present invention can be achieved through the following technical solutions: An oil-immersed distribution transformer, comprising: a distribution transformer body, a heat exchange oil pipe disposed inside the distribution transformer body, a return oil pipe connected to the left end of the heat exchange oil pipe, an oil tank located above a sealing top cover disposed at the upper end of the return oil pipe, and a high-voltage bushing and a low-voltage bushing disposed at the upper end of the sealing top cover; A second mounting plate is provided at the left end of the distribution transformer body, and first mounting plates are provided at both the front and rear ends of the distribution transformer body. Second heat dissipation fins are evenly distributed on the outer side of the first mounting plate. A mounting frame is provided at the right end of the distribution transformer body, a servo motor and a bracket are provided on the inner side of the mounting frame, and a first heat dissipation fin is provided on the outer side of the mounting frame. A dustproof top cover movably connected via a fixed support column is provided above the sealing top cover.

[0006] As a further solution of the present invention: the heat exchange oil pipe is arranged in an equidistant manner along the inner wall of the distribution transformer body, and a communication structure is formed between the heat exchange oil pipe and the oil drain valve pipe and the return oil pipe.

[0007] As a further solution of the present invention: the upper end of the heat exchange oil pipe is provided with an oil inlet pipe connected to the oil tank through an oil flow relay, and the front end of the oil tank is provided with an observation scale window for easy viewing of the oil amount.

[0008] As a further solution of the present invention: a movable sleeve with a movable connection is provided on the inner side of the upper end of the fixed support column, and a first reciprocating screw connected to the hinge chain is provided on the inner side of the movable sleeve. The fixed support column is threadedly connected to the sealing top cover through a second bolt.

[0009] As a further solution of the present invention: the movable sleeve forms a fitting rotating structure on the inner side of the upper end of the fixed support column, the movable sleeve is connected to the first reciprocating screw rod by a threaded connection, and the first reciprocating screw rod forms a rotating structure at the lower end of the hinge chain.

[0010] As a further solution of the present invention: the longitudinal section of the dustproof top cover is triangular, and drainage grooves are equidistantly provided on the inner side of the upper end of the dustproof top cover.

[0011] As a further solution of the present invention: the servo motor and the bracket are installed on the inner side of the mounting frame through the accommodating cavity, the servo motor and the bracket also include a first fan blade and a second fan blade, and a filter mesh is provided on the inner side of the outer end of the mounting frame.

[0012] As a further solution of the present invention: a first heat dissipating fin is fixedly mounted on the outer end of the mounting frame, a second reciprocating screw is mounted inside the mounting frame, and a movable support plate is provided on the outer side of the second reciprocating screw.

[0013] As a further solution of the present invention: the second reciprocating screw is connected to the movable support plate by means of threads, the movable support plate forms a snap-fit ​​sliding structure in the mounting frame, a brush is provided on the inner side of the movable support plate, and the outer surface of the brush is respectively fitted between the filter mesh hole and the inner surface of the first heat dissipating fin.

[0014] As a further solution of the present invention: a second heat dissipation fin connected by threads is provided at the connection between the first mounting plate and the distribution transformer body, and a guide groove and a convection through-hole groove are respectively opened on the inner side of the second heat dissipation fin.

[0015] Beneficial effects of the present invention: 1. The heat exchange oil pipe is evenly spaced around the inner wall of the distribution transformer. When the oil in the tank is input into the oil flow relay from the oil inlet pipe, it directly enters the heat exchange oil pipe after treatment. After recirculation, it is sucked into the oil tank from the return oil pipe, and the waste oil is discharged from the oil drain valve pipe. In this way, the cooling effect of the distribution transformer body is achieved. In addition, a first mounting plate is provided at both the front and rear ends of the distribution transformer body, and a second mounting plate is installed at the left end of the distribution transformer body, which can diffuse and dissipate the heat generated in the distribution transformer body under the action of the second heat dissipation fins and the third heat dissipation fins; 2. A mounting frame is installed at the right end of the distribution transformer body. When the first and second fan blades are opened, the heat in the distribution transformer body can be dissipated outwards and then filtered out through the filter mesh. The setting of the filter mesh can prevent dust from entering and prevent the first and second fan blades from being damaged; In addition, a first heat dissipation fin is fixedly installed on the outer end of the mounting frame, and a second reciprocating screw threadedly connected to the movable support plate is provided on the inner side of the mounting frame. When the servo motor body is turned on and the second reciprocating screw is rotated, the movable support plate can be made to reciprocate up and down on the inner side of the first heat dissipation fin, so as to use a brush to clean the dust on the filter mesh holes and the outer surface of the first heat dissipation fin, so as to avoid dust blockage caused by long-term use, which makes it difficult for heat to dissipate.

[0016] 3. The dust cover is movably connected to the upper end of the fixed support column. When the movable sleeve is rotated, the first reciprocating screw connected with the thread can be driven to move up and down in the fixed support column, so as to adjust the height and angle of the dust cover. In addition, the upper longitudinal section of the dustproof top cover is triangular, and a drainage groove is opened on the inner side of the dustproof top cover, which can guide the discharge of dust and rainwater to avoid accumulation above the dustproof top cover and subsequent falling onto the sealing top cover, causing interference to the high-voltage bushing and the low-voltage bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of the connection between the sealing top cover and the dustproof top cover of the present invention; Figure 2 This is a schematic diagram of the overall cross-sectional structure of the connection between the distribution transformer body and the sealing top cover of the present invention; Figure 3 This is a schematic diagram of the overall structure of the connection between the sealing top cover and the high-voltage bushing of the present invention; Figure 4 This is a schematic diagram of the overall structure of the connection between the heat exchange oil pipe and the oil drain valve pipe of the present invention; Figure 5 This is a schematic diagram of the overall structure of the connection between the heat exchange oil pipe and the return oil pipe of the present invention; Figure 6 This is a schematic diagram of the overall cross-sectional structure of the connection between the fixed support column and the dustproof top cover of the present invention; Figure 7 This is a schematic diagram of the overall exploded structure of the connection between the mounting frame, the servo motor and the bracket of the present invention; Figure 8 This is a schematic diagram of the overall exploded structure of the connection between the mounting frame and the second reciprocating screw rod of the present invention; Figure 9 It is a schematic diagram of the overall exploded structure of the connection between the first mounting plate and the second heat dissipation fin of the present invention; Figure 10 It is a schematic diagram of the overall structure of the connection between the distribution transformer body and the mounting foot of the present invention.

[0019] Figure: 1. Distribution transformer body; 101. Heat exchange oil pipe; 102. Oil drain valve pipe; 103. Oil inlet pipe; 104. Return oil pipe; 105. Oil flow relay; 106. Oil tank; 107. Observation scale window; 108. Oil filling pipe; 109. Mounting foot; 2. Sealing top cover; 201. First bolt; 3. High-voltage bushing; 4. Low-voltage bushing; 5. Fixed support column; 501. Second bolt; 502. Movable bushing; 503. First reciprocating screw; 504. Hinge chain; 6. Dustproof top cover; 601. Drain groove; 7. Mounting frame Frame; 701, third bolt; 702, accommodating chamber; 703, servo motor and bracket; 7031, first fan blade; 7032, second fan blade; 704, filter mesh; 705, first heat dissipation fin; 706, servo motor body; 707, second reciprocating screw; 708, movable support plate; 709, brush; 8, first mounting plate; 801, fourth bolt; 802, second heat dissipation fin; 803, guide groove; 804, convection through-hole groove; 9, second mounting plate; 901, fifth bolt; 902, third heat dissipation fin. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0021] See also Figure 1-10 As shown, the present invention is an oil-immersed distribution transformer.

[0022] Example 1 See also Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 10 The present invention provides a technical solution: a distribution transformer body 1, a heat exchange oil pipe 101 is provided on the inner side of the distribution transformer body 1, the left end of the heat exchange oil pipe 101 is connected to the return oil pipe 104, the upper end of the return oil pipe 104 is provided with an oil tank 106 located above the sealing top cover 2, and the upper end of the sealing top cover 2 is respectively provided with a high-voltage bushing 3 and a low-voltage bushing 4.

[0023] Furthermore, the heat exchange oil pipe 101 is equidistantly arranged around the inner wall of the distribution transformer body 1 , and a communication structure is formed between the heat exchange oil pipe 101 and the oil drain valve pipe 102 and the return oil pipe 104 .

[0024] Furthermore, an oil inlet pipe 103 connected to an oil tank 106 is provided at the upper end of the heat exchange oil pipe 101 through an oil flow relay 105 , and an observation scale window 107 is provided at the front end of the oil tank 106 for easy viewing of the oil level.

[0025] Specifically, first, the distribution transformer body 1 is installed at a designated position of the outdoor distribution cabinet through the mounting feet 109 fixedly connected at the four corners of the lower end, and the heat exchange oil pipe 101 is arranged equidistantly along the inner wall of the distribution transformer body 1. When the oil in the oil tank 106 enters the oil flow relay 105 from the oil inlet pipe 103, it directly enters the heat exchange oil pipe 101 after being processed by the oil flow relay 105, and the distribution transformer body 1 is cooled and cooled, so that the heated oil is sucked back into the oil tank 106 from the return oil pipe 104, so as to circulate the cooling, and the remaining oil in the oil tank 106 can be directly checked by observing the scale window 107. When the oil capacity reaches the warning value, oil can be directly added from the oil filling pipe 108. During the oil circulation cooling process, if waste oil is generated, it can be directly discharged from the oil drain valve pipe 102. The oil flow relay 105 can detect the operation status of the oil pump of the oil circulation cooling system.

[0026] Among them, the oil body in the oil tank 106 is mineral insulating oil, which has high dielectric strength and can effectively prevent breakdown between components with different potentials inside the distribution transformer body 1. Under normal operating voltage, it can provide reliable insulation protection for the windings and the iron core, and between the windings, etc., to ensure the safe and stable operation of the distribution transformer body 1. At the same time, the thermal conductivity of the mineral insulating oil is relatively high, which can effectively conduct the heat generated by the windings and the iron core inside the distribution transformer body 1. The oil circulates inside the distribution transformer body 1 and dissipates the heat to the surrounding environment through the outer wall of the distribution transformer body 1. When the distribution transformer body 1 is running at full load, the oil can quickly take away the heat generated by the windings. The heat of the distribution transformer body 1 is ensured to be not too high in temperature, thereby extending the service life of the distribution transformer body 1. Moreover, under normal operating conditions, the mineral insulating oil has good chemical stability and is not easy to react chemically with the metal, insulating material, etc. inside the distribution transformer body 1. It can maintain its own chemical properties unchanged for a long time, reduce the possibility of oil deterioration, and ensure the normal operation of the distribution transformer body 1. The distribution transformer body 1 is connected to the sealing top cover 2 by a threaded connection through the first bolt 201. After removing the first bolt 201, the sealing top cover 2 can be taken out as a whole, which is convenient for repairing or replacing the electrical equipment in the distribution transformer body 1.

[0027] Example 2 See also Figure 1-Figure 3 、 Figure 7 、 Figure 8 and Figure 9 The present invention provides a technical solution: a second mounting plate 9 is provided at the left end of the distribution transformer body 1, a first mounting plate 8 is provided at both the front and rear ends of the distribution transformer body 1, second heat dissipation fins 802 are evenly distributed on the outer side of the first mounting plate 8, a mounting frame 7 is provided at the right end of the distribution transformer body 1, a servo motor and a bracket 703 are provided on the inner side of the mounting frame 7, and a first heat dissipation fin 705 is provided on the outer side of the mounting frame 7.

[0028] Furthermore, the servo motor and bracket 703 are installed on the inner side of the mounting frame 7 through the accommodating cavity 702 . The servo motor and bracket 703 also include a first fan blade 7031 and a second fan blade 7032 . A filter mesh hole 704 is provided on the inner side of the outer end of the mounting frame 7 .

[0029] Furthermore, a first heat dissipation fin 705 is fixedly mounted on the outer end of the mounting frame 7 , a second reciprocating screw 707 is mounted inside the mounting frame 7 , and a movable support plate 708 is provided on the outer side of the second reciprocating screw 707 .

[0030] Furthermore, the second reciprocating screw 707 is connected to the movable support plate 708 by means of threads, and the movable support plate 708 forms a snap-fit ​​sliding structure in the mounting frame 7. A brush 709 is provided on the inner side of the movable support plate 708, and the outer surface of the brush 709 is respectively fitted with the filter mesh 704 and the inner surface of the first heat dissipation fin 705.

[0031] Furthermore, a second heat dissipation fin 802 connected by threads is provided at the connection between the first mounting plate 8 and the distribution transformer body 1 , and a guide groove 803 and a convection through-hole groove 804 are respectively provided on the inner side of the second heat dissipation fin 802 .

[0032] Specifically, in combination with the first embodiment, a second mounting plate 9 is provided at the left end of the distribution transformer body 1, which is threadedly connected by a fifth bolt 901. When heat is generated in the distribution transformer body 1, it can also be dissipated outward through the third heat dissipation fins 902. The front and rear ends of the distribution transformer body 1 are both threadedly connected to the first mounting plate 8 by the fourth bolt 801, and the second heat dissipation fins 802 are equidistantly distributed at the outer end of the first mounting plate 8. Guide grooves 803 and convection through-hole grooves 804 are equidistantly opened on the inner side of the second heat dissipation fins 802. The provision of the guide grooves 803 and the convection through-hole grooves 804 can increase the surface area of ​​the second heat dissipation fins 802, so that more heat can be dissipated through oil-air convection. Improving the overall heat dissipation capacity can increase the heat dissipation efficiency by 10%~20%, and the setting of the guide groove 803 and the convection through-hole groove 804 can disturb the airflow, reduce the air retention layer on the surface of the second heat dissipation fin 802, enhance the turbulence effect, and improve the heat transfer coefficient. In addition, the setting of the guide groove 803 and the convection through-hole groove 804 can increase the deformation resistance of the second heat dissipation fin 802 and reduce fatigue cracking caused by vibration or thermal expansion and contraction. Under the same heat dissipation performance, the special structure of the guide groove 803 and the convection through-hole groove 804 can reduce the material usage and reduce the overall weight of the transformer. It can further prevent dust from spreading and accumulating on the surface of the second heat dissipation fin 802, avoiding long-term attenuation of heat dissipation performance. When used outdoors, it can be cleaned by washing with rainwater.

[0033] In addition, the right end of the distribution transformer body 1 is threadedly connected to the mounting frame 7 through a third bolt 701, and the inner side of the outer end of the mounting frame 7 is evenly provided with filter mesh holes 704. When the temperature inside the distribution transformer body 1 continues to be high, the servo motor and the bracket 703 can be turned on to rotate the first fan blade 7031 and the second fan blade 7032 to forcibly dissipate the temperature inside the distribution transformer body 1, so that the heat can be discharged more quickly from the filter mesh holes 704. However, long-term use will cause dust and other impurities in the air to accumulate on the surface of the filter mesh holes 704. The blockage makes it difficult for heat to dissipate. At this time, it is necessary to open the servo motor body 706 and rotate the second reciprocating screw 707. The second reciprocating screw 707 is connected to the movable support plate 708 in a threaded manner, and the movable support plate 708 forms a snap-fit ​​sliding structure in the middle of the outer end of the mounting frame 7. When the movable support plate 708 moves up and down, the outer surface of the filter mesh 704 and the outer surface of the first heat dissipating fin 705 can be cleaned by using the brush 709 bonded to the inner side of the movable support plate 708. After the dust is cleaned, the heat dissipation effect can be improved.

[0034] The outer surfaces of the second heat dissipation fins 802 , the third heat dissipation fins 902 and the first heat dissipation fins 705 are all coated with an anti-corrosion coating to prevent rust.

[0035] Example 3 See also Figure 1 、 Figure 2 and Figure 6 The present invention provides a technical solution: a dustproof top cover 6 movably connected to the sealing top cover 2 is provided above the sealing top cover 2; Furthermore, a movable sleeve 502 with a movable connection is provided on the inner side of the upper end of the fixed support column 5, and a first reciprocating screw rod 503 connected to the hinge chain 504 is provided on the inner side of the movable sleeve 502. The fixed support column 5 is threadedly connected to the sealing top cover 2 through the second bolt 501.

[0036] Furthermore, the movable sleeve 502 forms a fitting rotating structure on the inner side of the upper end of the fixed support column 5 , and the movable sleeve 502 is connected to the first reciprocating screw rod 503 by a threaded connection, and the first reciprocating screw rod 503 forms a rotating structure at the lower end of the hinge chain 504 .

[0037] Furthermore, the longitudinal section of the dustproof top cover 6 is triangular, and drainage grooves 601 are equidistantly provided on the inner side of the upper end of the dustproof top cover 6 .

[0038] Specifically, in combination with the first and second embodiments, a rotating structure is formed at the upper end of the fixed support column 5 by the dustproof top cover 6, and the upper end longitudinal section of the dustproof top cover 6 is triangular. When there is too much dust or rain in the air, the dust and rain can be discharged in a guided manner from the drainage grooves 601 evenly opened on the inner side of the dustproof top cover 6 to avoid accumulation and subsequent falling onto the high-voltage bushing 3 and the low-voltage bushing 4, affecting power transmission. When not in use for a long time, the movable sleeve 502 can be rotated to make it perform a circular rotation motion at the upper end of the fixed support column 5, and the movable sleeve 502 can be used to discharge the dust and rain in a guided manner. The threaded connection between the first reciprocating screw rod 503 and the first reciprocating screw rod 503 can drive the threadedly connected first reciprocating screw rod 503 to perform telescopic movement up and down in the fixed support column 5 when the movable sleeve 502 is rotated, so that the first reciprocating screw rod 503 rotates at the lower end of the hinge chain 504, and can perform height or angle tilt movement on the dustproof top cover 6 as a whole, so that under the action of the dustproof top cover 6, the dust and rainproof effect of the upper end of the sealing top cover 2 is improved, wherein the fixed support column 5 is fixedly installed on the upper end of the sealing top cover 2 by the second bolt 501, which can facilitate the disassembly and installation of the fixed support column 5 as a whole at a later time.

[0039] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An oil-immersed distribution transformer, characterized in that: include: A distribution transformer body (1), wherein a heat exchange oil pipe (101) is provided on the inner side of the distribution transformer body (1), the left end of the heat exchange oil pipe (101) is connected to a return oil pipe (104), the upper end of the return oil pipe (104) is provided with an oil tank (106) located above a sealing top cover (2), and the upper end of the sealing top cover (2) is respectively provided with a high-voltage bushing (3) and a low-voltage bushing (4); A second mounting plate (9) is provided at the left end of the distribution transformer body (1), first mounting plates (8) are provided at both the front and rear ends of the distribution transformer body (1), second heat dissipation fins (802) are provided at equal intervals on the outer side of the first mounting plate (8), a mounting frame (7) is provided at the right end of the distribution transformer body (1), a servo motor and a bracket (703) are provided on the inner side of the mounting frame (7), and first heat dissipation fins (705) are provided on the outer side of the mounting frame (7); A dustproof top cover (6) movably connected via a fixed support column (5) is provided above the sealing top cover (2).

2. The oil-immersed distribution transformer according to claim 1, characterized in that: The heat exchange oil pipe (101) is arranged in a circle along the inner wall of the distribution transformer body (1) at equal intervals, and a communication structure is formed between the heat exchange oil pipe (101), the oil drain valve pipe (102), and the return oil pipe (104).

3. The oil-immersed distribution transformer according to claim 2, characterized in that: The upper end of the heat exchange oil pipe (101) is provided with an oil inlet pipe (103) connected to the oil tank (106) via an oil flow relay (105). The front end of the oil tank (106) is provided with an observation scale window (107) for conveniently checking the oil amount.

4. The oil-immersed distribution transformer according to claim 1, characterized in that: A movable sleeve (502) is provided on the inner side of the upper end of the fixed support column (5), and a first reciprocating screw rod (503) connected to the hinge chain (504) is provided on the inner side of the movable sleeve (502). The fixed support column (5) is threadedly connected to the sealing top cover (2) via a second bolt (501).

5. The oil-immersed distribution transformer according to claim 4, characterized in that: The movable sleeve (502) forms a fitted rotating structure on the inner side of the upper end of the fixed support column (5), the movable sleeve (502) and the first reciprocating screw rod (503) are connected in a threaded manner, and the first reciprocating screw rod (503) forms a rotating structure at the lower end of the hinge chain (504).

6. The oil-immersed distribution transformer according to claim 1, characterized in that: The longitudinal section of the dustproof top cover (6) is triangular, and drainage grooves (601) are equidistantly provided on the inner side of the upper end of the dustproof top cover (6).

7. The oil-immersed distribution transformer according to claim 1, characterized in that: The servo motor and the bracket (703) are mounted on the inner side of the mounting frame (7) via the accommodating cavity (702). The servo motor and the bracket (703) further comprise a first fan blade (7031) and a second fan blade (7032). A filter mesh hole (704) is provided on the inner side of the outer end of the mounting frame (7).

8. The oil-immersed distribution transformer according to claim 7, characterized in that: A first heat dissipation fin (705) is fixedly mounted on the outer end of the mounting frame (7), a second reciprocating screw rod (707) is mounted inside the mounting frame (7), and a movable support plate (708) is provided on the outer side of the second reciprocating screw rod (707).

9. The oil-immersed distribution transformer according to claim 8, characterized in that: The second reciprocating screw (707) is connected to the movable support plate (708) by means of a thread, and the movable support plate (708) forms a snap-fit ​​sliding structure in the mounting frame (7). A brush (709) is provided on the inner side of the movable support plate (708), and the outer surface of the brush (709) is respectively fitted with the filter mesh (704) and the inner surface of the first heat dissipation fin (705).

10. The oil-immersed distribution transformer according to claim 1, characterized in that: A threaded second heat dissipation fin (802) is provided at the connection between the first mounting plate (8) and the distribution transformer body (1), and a guide groove (803) and a convection through-hole groove (804) are respectively provided on the inner side of the second heat dissipation fin (802).

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