Transformer with waterproof function

Abstract

According to the transformer with the waterproof function applied to the field of transformers, the multiple sealing pieces are arranged, the contact positions of the upper cover and the shell and the contact positions of the lead and the shell are sealed in a multi-stage mode, and the good waterproof effect is achieved; a first annular cavity formed in the outer side of a sealing rubber ring and a second annular cavity formed in the outer side of a first sealing rubber sleeve are matched with an air supply mechanism capable of generating cold and hot air flow to heat and cool a sealing piece, the probability of overheating oxidation and supercooling embrittlement of the sealing piece is reduced, the elastic attenuation condition of the sealing piece is reduced, and the service life of the sealing piece is prolonged. The sealing waterproof effect of the sealing piece is improved, the service life of the sealing piece is prolonged, meanwhile, the sealing piece is heated through the air supply mechanism wrapping the hollow fins and heat generated by the transformer, and energy is saved; in addition, through a moving ring and an electric push rod which are arranged in the barrel, switching between hot air flow and cold air flow is facilitated.

Description

Technical Field

[0001] The present invention relates to a transformer, in particular to a transformer with a waterproof function applied in the field of transformers. Background Art

[0002] Outdoor transformers, exposed to rain for extended periods, have stringent requirements for waterproofing. To ensure effective sealing, sealing rings are typically installed at housing joints and sealing sleeves are fitted where the winding leads exit. However, these sealing components are subject to material degradation: oxidation reactions occur at high temperatures, and embrittlement occurs at low temperatures, leading to a gradual loss of seal elasticity and structural damage. As this elasticity diminishes, the seal's fit with the mating end face decreases, ultimately reducing waterproofing performance and impacting equipment reliability.

[0003] The existing patent with publication number CN108666074B discloses a waterproof high-frequency transformer structure. This waterproof high-frequency transformer structure achieves the effect of preliminary waterproofing of the high-frequency transformer body through the cooperation of the extended box body and the first waterproof mechanism; the second waterproof mechanism cooperates with the container box body to achieve the effect of secondary sealing and waterproofing at the connection and rainwater drainage; the water collection mechanism collects and discharges the infiltrated rainwater, achieving the effect of using rainwater to cool the container box body; and the shock-absorbing mechanism achieves a shock-absorbing and fixing effect during installation.

[0004] The above-mentioned prior art discloses that the first waterproof mechanism and the second waterproof mechanism realize multi-stage sealing, but does not solve the problem that the sealing member is easily oxidized at high temperature and embrittled at low temperature, which affects the sealing and waterproof performance. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the sealing components of the existing transformers are easily oxidized and embrittled, which affects the waterproof performance.

[0006] To solve the above problems, the present invention provides a transformer with a waterproof function, comprising a housing, an upper cover fixedly connected to the upper end of the housing by bolts, and a transformer winding fixedly connected to the interior of the housing, which is fixedly connected to a plurality of leads extending above the upper cover; a mounting cylinder fixedly connected to the outer wall of the upper cover and sleeved on the outside of the leads, a first sealing rubber sleeve with an interference fit with the leads fixedly connected to the interior of the upper end opening of the mounting cylinder, and a threaded cap threadedly connected to the mounting cylinder abutting the upper end of the first sealing rubber sleeve; A sealing rubber ring is fixedly connected to the abutment point between the upper cover and the shell, and a first annular cavity opposite to the sealing rubber ring is provided inside the upper cover, a second annular cavity concentrically provided with the first sealing rubber sleeve is provided inside the mounting tube, and a connecting channel extending into the mounting tube and connecting the first annular cavity and the second annular cavity is also provided in the upper cover, and an exhaust hole provided on the side wall of the mounting tube is connected to the upper part of the second annular cavity, and the exhaust hole is connected to the external atmosphere; the first annular cavity is fixedly connected to an air supply mechanism, which is used to generate hot and cold air flows and transport them to the first annular cavity.

[0007] In the above-mentioned transformer with waterproof function, the temperature of the seal is regulated by the annular cavity provided on the outside of the seal, thereby reducing the probability of overheating oxidation and overcooling embrittlement of the seal.

[0008] As a further improvement of the present application, the upper cover includes a conical cylinder portion and a disc portion located at the lower end of the conical cylinder portion and integrally formed therewith, the edge of the disc portion abuts against the sealing rubber ring, and the disc portion is provided with a through hole for the lead wire to pass through, and a second sealing rubber sleeve with an interference fit with the lead wire is fixedly connected in the through hole, and the position of the through hole is adjacent to the first annular cavity.

[0009] As a further improvement of the present application, a plurality of hollow fins are fixedly connected to the circumferential side wall of the shell and are connected to its inner cavity. The inner cavities of both the shell and the hollow fins are filled with transformer oil. The air supply mechanism includes a cylinder fixedly wrapped around the hollow fins, a fan is fixedly connected inside the cylinder, and an air injection pipe is fixedly connected to the outer end of the cylinder. The outer end of the air injection pipe is fixedly connected to the outer wall of the upper cover and is connected to the first annular cavity.

[0010] As a further improvement of the present application, a fixed ring is fixedly connected to the inner wall of the cylinder away from the hollow fins, and a movable ring is provided on one side of the fixed ring that is slidably connected to the inner wall of the cylinder. The movable ring is rotatably connected to the output shaft of the fan. A central hole for air flow is provided at the center of the fixed ring, and a plurality of air guide holes that are evenly distributed in a circle and are arranged opposite to the side wall of the fixed ring are provided on the movable ring. An air inlet hole that is arranged opposite to the movable ring is provided on the circumferential outer wall of the cylinder. The movable ring is fixedly connected to the movable end of an electric push rod, and the fixed end of the electric push rod is fixedly connected to the inner wall of the cylinder. The electric push rod drives the movable ring to move laterally to open and close the air inlet hole, the central hole and the air guide hole.

[0011] As a further improvement of the present application, the shell is a cylindrical structure with an open upper end, the upper cover is a hollow conical cylindrical structure, and an annular groove with an opening is provided at the lower edge of the upper cover. The fixing bolt is arranged in the annular groove and passes through the upper cover and is threadedly connected to the outer wall of the shell.

[0012] As a further improvement of the present application, the first sealing rubber sleeve is provided with an extrusion cavity with an upper end opening, and an extrusion protrusion inserted into the extrusion cavity is fixedly connected to the inner side of the threaded cover.

[0013] As a further improvement of the present application, the cylinder body has a conical cylindrical structure, the opening of which is facing the shell side is fixedly connected to a filter disc, and the outer wall of the cylinder body is fixedly sleeved with a filter cylinder arranged opposite to the air inlet hole.

[0014] As a further improvement of the present application, a controller and a temperature sensor are fixedly connected to the outer side wall of the cylinder, and the fan, temperature sensor and electric push rod are all electrically connected to the controller.

[0015] As a further improvement of the present application, a first electromagnetic flow valve is fixedly connected to the connection point between the gas injection pipe and the cylinder, an exhaust pipe is fixedly connected to the cylinder, and a second electromagnetic flow valve is fixedly connected to the connection point between the exhaust pipe and the cylinder. Both the first electromagnetic flow valve and the second electromagnetic flow valve are electrically connected to the controller.

[0016] As a further improvement of the present application, the exhaust pipe is fixedly connected to a return pipe, a third electromagnetic flow valve is fixedly connected to the connection point between the return pipe and the exhaust pipe, and a fourth electromagnetic flow valve is fixedly connected to the outlet end of the exhaust pipe. Both the third electromagnetic flow valve and the fourth electromagnetic flow valve are electrically connected to the controller.

[0017] To sum up, the present invention performs multi-stage sealing on the contact positions of the upper cover and the lead with the shell through a seal including a sealing rubber ring, a first sealing rubber sleeve and a second sealing rubber sleeve, and has a good waterproof effect. At the same time, through the first annular cavity arranged on the outside of the sealing rubber ring and the second annular cavity arranged on the outside of the first sealing rubber sleeve, and in conjunction with an air supply mechanism that can generate hot and cold air flows, the seal is heated and cooled, the temperature of the seal is adjusted, the probability of overheating oxidation and overcooling embrittlement of the seal is reduced, the elastic attenuation of the seal is reduced, and the sealing and waterproof effect and service life of the seal are improved. At the same time, through the air supply mechanism coated on the hollow fin, the heat generated by the transformer is used to heat the seal, saving energy; in addition, through the movable ring and electric push rod arranged in the cylinder, the switching of hot air flow and cold air flow is facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of this application; Figure 2 This is a schematic cross-sectional view of the structure of the present application at the installation tube position; Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle; Figure 4 This is a schematic diagram of the assembly structure of the first sealing rubber sleeve in this application; Figure 5 This is a schematic diagram of the structure of the gas supply mechanism of this application; Figure 6 for Figure 5Schematic diagram of the enlarged structure at B in the middle; Figure 7 This is a schematic diagram of airflow when the seal is heated in this application; Figure 8 Schematic diagram of air flow when cooling the seal in this application.

[0019] Description of the numbers in the figure: 1. Housing; 2. Upper cover; 201. Conical cylinder; 202. Disc; 2021. Connecting hole; 203. First annular cavity; 204. Connecting channel; 3. Transformer winding; 4. Lead wire; 5. Sealing rubber ring; 6. Mounting cylinder; 601. Second annular cavity; 602. Exhaust hole; 7. First sealing rubber sleeve; 701. Extrusion cavity; 8. Threaded cap; 801. Extrusion protrusion; 9. Second sealing rubber sleeve; 10. Hollow fin; 11. Air supply mechanism ; 12. Cylinder; 1201. Air inlet; 13. Fan; 14. Filter plate; 15. Air injection pipe; 16. First electromagnetic flow valve; 17. Exhaust pipe; 18. Second electromagnetic flow valve; 19. Controller; 20. Temperature sensor; 21. Fixed ring; 2101. Center hole; 22. Movable ring; 2201. Air guide hole; 23. Electric push rod; 24. Return pipe; 25. Third electromagnetic flow valve; 26. Fourth electromagnetic flow valve; 27. Filter cylinder. DETAILED DESCRIPTION

[0020] The following describes two implementation methods of the present application in detail with reference to the accompanying drawings.

[0021] The first implementation method: Figures 1-8 A waterproof transformer is shown, comprising a housing 1, an upper cover 2 being fixedly connected to the upper end of the housing 1 by bolts, and a transformer winding 3 being fixedly connected thereto. The transformer winding 3 is fixedly connected to a plurality of leads 4 extending above the upper cover 2; a mounting tube 6 is fixedly connected to the outer wall of the upper cover 2 and sleeved around the outside of the leads 4; a first sealing rubber sleeve 7 is fixedly connected to the interior of the upper opening of the mounting tube 6 to form an interference fit with the leads 4; a threaded cap 8 threadedly connected to the mounting tube 6 is abutted against the upper end of the first sealing rubber sleeve 7; See also Figure 2 and Figure 3, the upper cover 2 is fixedly connected to the abutment of the shell 1 with a sealing rubber ring 5, and a first annular cavity 203 opposite to the sealing rubber ring 5 is opened inside the upper cover 2, and a second annular cavity 601 concentrically arranged with the first sealing rubber sleeve 7 is opened inside the mounting tube 6, and a connecting channel 204 extending into the mounting tube 6 and connecting the first annular cavity 203 and the second annular cavity 601 is also opened in the upper cover 2, and the upper part of the second annular cavity 601 is connected to an exhaust hole 602 opened on the side wall of the mounting tube 6, and the exhaust hole 602 is connected to the external atmosphere; the first annular cavity 203 is fixedly connected to the supply The air mechanism 11, the air supply mechanism 11 is used to generate hot and cold air flows and transport them to the first annular cavity 203. The hot and cold air flows entering the first annular cavity 203 heat or cool the sealing rubber ring 5 through the shell wall of the upper cover 2. The hot and cold air flows entering the first annular cavity 203 enter the second annular cavity 601 through the connecting channel 204. The hot and cold air flows entering the second annular cavity 601 heat or cool the first sealing rubber sleeve 7 through the shell wall of the mounting tube 6. The hot and cold air flows entering the second annular cavity 601 are finally discharged to the external atmosphere through the exhaust hole 602.

[0022] Compared with traditional transformers, the present invention achieves sealing of the contact hole between the transformer and the external atmosphere by means of a sealing rubber ring 5 provided at the junction of the shell 1 and the upper cover 2 and a first sealing rubber sleeve 7 provided at the position where the lead 4 passes through the upper cover 2. At the same time, by means of a first annular cavity 203 provided on the outside of the sealing rubber ring 5 and a second annular cavity 601 provided on the outside of the first sealing rubber sleeve 7, and in conjunction with an air supply mechanism 11 capable of generating hot and cold airflows, the sealing rubber ring 5 and the first sealing rubber sleeve 7 are heated and cooled, the temperature of the sealing rubber ring 5 and the first sealing rubber sleeve 7 is adjusted, the probability of oxidation and embrittlement of the sealing rubber ring 5 and the first sealing rubber sleeve 7 is reduced, the elastic attenuation of the sealing rubber ring 5 and the first sealing rubber sleeve 7 is reduced, and the sealing and waterproof effect of the sealing rubber ring 5 and the first sealing rubber sleeve 7 is improved.

[0023] See also Figure 1 and Figure 3 The shell 1 is a cylindrical structure with an open upper end, and the upper cover 2 is a hollow conical cylindrical structure. An annular groove with an opening facing the lower edge of the upper cover 2 is provided. The fixing bolt is arranged in the annular groove and passes through the upper cover 2 and is threadedly connected to the outer wall of the shell 1.

[0024] Specifically, the tapered cylindrical upper cover 2 reduces the retention of rainwater on the transformer upper cover 2, reduces the probability of rainwater accumulating on the upper cover 2 and flowing toward the lead-out position of the lead 4, and further improves the waterproof effect of the upper cover 2. At the same time, the annular groove at the lower end edge of the upper cover 2 is provided to protect the fixing bolts, and reduces the rainwater flowing along the circumferential outer wall of the shell 1, thereby reducing the probability of rainwater corroding and intruding the shell 1.

[0025] See also Figure 5 and Figure 6 A plurality of hollow fins 10 are fixedly connected to the circumferential side wall of the shell 1 and are connected to its inner cavity. The inner cavities of both the shell 1 and the hollow fins 10 are filled with transformer oil. The air supply mechanism 11 includes a cylinder 12 fixedly covered on the hollow fins 10, and a fan 13 is fixedly connected to the cylinder 12. The outer end of the cylinder 12 is fixedly connected to an air injection pipe 15. The outer end of the air injection pipe 15 is fixedly connected to the outer wall of the upper cover 2 and is connected to the first annular cavity 203.

[0026] Specifically, when the ambient temperature is low, the external air flow enters the cylinder 12 through the end of the cylinder 12 away from the air injection pipe 15, and the air flow entering the cylinder 12 exchanges heat with the hollow fins 10 to heat the air flow entering the cylinder 12. The hot air flow enters the first annular cavity 203 through the air injection pipe 15, and the hot air flow entering the first annular cavity 203 enters the second annular cavity 601 through the connecting channel 204, and is finally discharged from the exhaust hole 602. In this process, the sealing rubber ring 5 and the first sealing rubber sleeve 7 are heated, reducing the cold shrinkage and embrittlement of the sealing rubber ring 5 and the first sealing rubber sleeve 7, thereby improving the waterproof sealing effect in winter. It should be noted that in order to avoid the embrittlement of the sealing rubber ring 5 and the first sealing rubber sleeve 7 under low temperature conditions, the temperature range of the hot air flow is 20-30 degrees Celsius.

[0027] See also Figure 6 A fixed ring 21 is fixedly connected to the inner wall of the cylinder 12 away from the hollow fin 10, and a movable ring 22 is provided on one side of the fixed ring 21 to be slidably connected to the inner wall of the cylinder 12. The movable ring 22 is rotatably connected to the output shaft of the fan 13. A central hole 2101 for air flow is provided at the center of the fixed ring 21, and a plurality of air guide holes 2201 that are evenly distributed in a circle and are arranged opposite to the side wall of the fixed ring 21 are provided on the movable ring 22. An air inlet 1201 that is arranged opposite to the movable ring 22 is provided on the circumferential outer wall of the cylinder 12. The movable ring 22 is fixedly connected to the movable end of the electric push rod 23, and the fixed end of the electric push rod 23 is fixedly connected to the inner wall of the cylinder 12. The electric push rod 23 drives the movable ring 22 to move laterally to realize the opening and closing of the air inlet hole 1201, the central hole 2101 and the air guide hole 2201.

[0028] Specifically, when the sealing rubber ring 5 and the first sealing rubber sleeve 7 need to be cooled, the electric push rod 23 is started, and the electric push rod 23 drives the movable ring 22 to abut against the fixed ring 21. At this time, the center hole 2101 is blocked by the movable ring 22, the air guide hole 2201 is blocked by the fixed ring 21, and the air inlet 1201 is connected to the inner cavity of the cylinder 12; at this time, the fan 13 is started, and the external air flow enters the cylinder 12 from the air inlet 1201, and then is injected into the first annular cavity 203 and the second annular cavity 601 through the air injection pipe 15, and finally is discharged from the exhaust hole 602. The flowing air flow is used to cool the sealing rubber ring 5 and the first sealing rubber sleeve 7, thereby reducing the oxidation probability of the sealing rubber ring 5 and the first sealing rubber sleeve 7 and improving the waterproof sealing performance of the sealing rubber ring 5 and the first sealing rubber sleeve 7 in a high temperature environment.

[0029] See also Figure 2 and Figure 6 The cylinder 12 is a conical cylindrical structure, and the opening facing the shell 1 is fixedly connected to the filter disc 14. The outer wall of the cylinder 12 is fixedly sleeved with a filter cartridge 27 arranged opposite to the air inlet 1201.

[0030] Specifically, the filter disc 14 and the filter cartridge 27 filter and remove dust from the airflow entering the air injection pipe 15, thereby reducing the risk of dust entering the first annular cavity 203 and the second annular cavity 601 and improving the heat exchange efficiency between the airflow and the shell wall of the upper cover 2.

[0031] See also Figure 6 The outer side wall of the cylinder 12 is fixedly connected with a controller 19 and a temperature sensor 20 , and the fan 13 , the temperature sensor 20 and the electric push rod 23 are all electrically connected to the controller 19 .

[0032] Specifically, the ambient temperature is detected by the temperature sensor 20 , and the electric push rod 23 is activated as needed to switch the cold air flow and the hot air flow of the air supply mechanism 11 .

[0033] See also Figure 6 A first electromagnetic flow valve 16 is fixedly connected to the connection point between the gas injection pipe 15 and the cylinder 12, an exhaust pipe 17 is fixedly connected to the cylinder 12, and a second electromagnetic flow valve 18 is fixedly connected to the connection point between the exhaust pipe 17 and the cylinder 12. Both the first electromagnetic flow valve 16 and the second electromagnetic flow valve 18 are electrically connected to the controller 19.

[0034] Specifically, the first electromagnetic flow valve 16 and the second electromagnetic flow valve 18 are used to adjust the amount of gas injected into the gas injection pipe 15 and the amount of gas directly discharged, thereby facilitating the control of the amount of gas for heating and cooling the sealing rubber ring 5 and the first sealing rubber sleeve 7.

[0035] See also Figure 6The exhaust pipe 17 is fixedly connected to a return pipe 24, and a third electromagnetic flow valve 25 is fixedly connected to the connection point between the return pipe 24 and the exhaust pipe 17. The outlet end of the exhaust pipe 17 is fixedly connected to a fourth electromagnetic flow valve 26. The third electromagnetic flow valve 25 and the fourth electromagnetic flow valve 26 are both electrically connected to the controller 19.

[0036] Specifically, during the cooling operation, the third electromagnetic flow valve 25 and the fourth electromagnetic flow valve 26 control the amount of air flowing back through the return pipe 24 to spray the hollow fins 10. While cooling the sealing rubber ring 5 and the first sealing rubber sleeve 7, the hollow fins 10 are cooled by spraying. It should be noted that the temperature of the cooling air flow is the same as the temperature of the external environment in the area where the transformer is located.

[0037] Second implementation method: Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 and Figure 8 A transformer with waterproof function is shown. Based on the first embodiment, the upper cover 2 includes a conical cylindrical portion 201 and a disc portion 202 located at the lower end of the conical cylindrical portion 201 and integrally formed therewith. The edge of the disc portion 202 abuts the sealing rubber ring 5. The disc portion 202 is provided with a through-hole 2021 for the lead wire 4 to pass through. A second sealing rubber sleeve 9 with an interference fit with the lead wire 4 is fixedly connected to the through-hole 2021. The through-hole 2021 is located adjacent to the first annular cavity 203.

[0038] Specifically, by providing a first sealing rubber sleeve 7 and a second sealing rubber sleeve 9, the connection between the lead 4 and the upper cover 2 is sealed at two levels, thereby improving the sealing effect of the connection between the upper cover 2 and the lead 4. At the same time, the airflow through the first annular cavity 203 heats and cools the second sealing rubber sleeve 9 in the connection hole 2021, thereby realizing temperature regulation of each sealing component. It should be noted that in this application, the sealing component refers to the sealing rubber ring 5, the first sealing rubber sleeve 7 and the second sealing rubber sleeve 9.

[0039] See also Figure 3 and Figure 4 The first sealing rubber sleeve 7 is provided with an extrusion cavity 701 with an upper opening, and an extrusion protrusion 801 which is inserted into the extrusion cavity 701 is fixedly connected to the inner side of the threaded cover 8 .

[0040] Specifically, when the threaded cover 8 is screwed, the extrusion protrusion 801 squeezes the first sealing rubber sleeve 7 in the installation tube 6, so that the first sealing rubber sleeve 7 better fits the inner wall of the installation tube 6 and the outer wall of the lead 4, further improving the sealing and waterproof effect.

[0041] See also Figure 3 and Figure 4The threaded cover 8 is threadedly sleeved on the outside of the mounting tube 6 and has a tapered surface 802 at its lower edge, and the exhaust hole 602 is arranged opposite to the tapered surface 802.

[0042] Specifically, the conical surface 802 arranged opposite to the exhaust hole 602 allows the discharged airflow to form a swirl, which sprays the connection between the installation cylinder 6 and the upper cover 2 with a swirl, reducing the retention of rainwater at the connection between the installation cylinder 6 and the upper cover 2 and accelerating the separation of rainwater.

[0043] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A transformer with waterproof function, characterized in that: The invention comprises a housing (1), wherein the upper end of the housing (1) is fixedly connected to an upper cover (2) by means of bolts, and a transformer winding (3) is fixedly connected inside the housing, and the transformer winding (3) is fixedly connected to a plurality of leads (4) extending above the upper cover (2); the outer wall of the upper cover (2) is fixedly connected to a mounting cylinder (6) sleeved on the outside of the leads (4); a first sealing rubber sleeve (7) having an interference fit with the leads (4) is fixedly connected to the inner opening of the upper end of the mounting cylinder (6); and a threaded cover (8) threadedly connected to the mounting cylinder (6) is abutted against the upper end of the first sealing rubber sleeve (7); A sealing rubber ring (5) is fixedly connected to the joint between the upper cover (2) and the shell (1), and a first annular cavity (203) is provided inside the upper cover and is arranged opposite to the sealing rubber ring (5). A second annular cavity (601) is provided inside the mounting tube (6) and is arranged concentrically with the first sealing rubber sleeve (7). A connecting channel (204) is also provided inside the upper cover (2) and extends into the mounting tube (6) and connects the first annular cavity (203) and the second annular cavity (601). The upper part of the second annular cavity (601) is connected to an exhaust hole (602) provided on the side wall of the mounting tube (6), and the exhaust hole (602) is connected to the external atmosphere. The first annular cavity (203) is fixedly connected to an air supply mechanism (11), and the air supply mechanism (11) is used to generate cold and hot air flows and transport them into the first annular cavity (203).

2. The transformer with waterproof function according to claim 1, characterized in that: The upper cover (2) comprises a conical cylinder portion (201) and a disc portion (202) located at the lower end of the conical cylinder portion (201) and integrally formed therewith. The edge of the disc portion (202) abuts against the sealing rubber ring (5). The disc portion (202) is provided with a through hole (2021) for the lead wire (4) to pass through. A second sealing rubber sleeve (9) having an interference fit with the lead wire (4) is fixedly connected in the through hole (221). The through hole (221) is located adjacent to the first annular cavity (203).

3. The transformer with waterproof function according to claim 1, characterized in that: A plurality of hollow fins (10) in communication with the inner cavity of the shell (1) are fixedly connected to the circumferential side wall of the shell (1), and the inner cavities of both the shell (1) and the hollow fins (10) are filled with transformer oil. The air supply mechanism (11) comprises a cylinder (12) fixedly covering the hollow fins (10), a fan (13) being fixedly connected to the cylinder (12), and an air injection pipe (15) being fixedly connected to the outer end of the cylinder (12), the outer end of the air injection pipe (15) being fixedly connected to the outer wall of the upper cover (2) and in communication with the first annular cavity (203).

4. The transformer with waterproof function according to claim 3, characterized in that: A fixed ring (21) is fixedly connected to the inner wall of the cylinder (12) away from the hollow fin (10), and a movable ring (22) is provided on one side of the fixed ring (21) and is slidably connected to the inner wall of the cylinder (12). The movable ring (22) is rotatably connected to the output shaft of the fan (13). A central hole (2101) for air flow is provided at the center of the fixed ring (21), and a plurality of circumferentially evenly distributed holes are provided on the movable ring (22) and are arranged opposite to the side wall of the fixed ring (21). The cylinder (12) is provided with an air guide hole (2201) on the circumferential outer wall thereof, an air inlet hole (1201) arranged opposite to the movable ring (22), the movable ring (22) is fixedly connected to the movable end of the electric push rod (23), the fixed end of the electric push rod (23) is fixedly connected to the inner wall of the cylinder (12), and the electric push rod (23) drives the movable ring (22) to move horizontally to realize opening and closing of the air inlet hole (1201), the center hole (2101) and the air guide hole (2201).

5. The waterproof transformer according to claim 1, characterized in that: The shell (1) is a cylindrical structure with an open top, and the upper cover (2) is a hollow conical cylindrical structure. An annular groove with an opening facing the bottom edge of the upper cover (2) is provided, and a fixing bolt is arranged in the annular groove and passes through the upper cover (2) and is threadedly connected to the outer wall of the shell (1).

6. The waterproof transformer according to claim 1, characterized in that: The first sealing rubber sleeve (7) is provided with an extrusion cavity (701) with an upper opening, and an extrusion protrusion (801) inserted into the extrusion cavity (701) is fixedly connected to the inner side of the threaded cover (8).

7. The waterproof transformer according to claim 4, characterized in that: The cylinder (12) is a conical cylindrical structure, and its opening facing the housing (1) is fixedly connected to a filter disc (14), and the outer wall of the cylinder (12) is fixedly sleeved with a filter cylinder (27) arranged opposite to the air inlet (1201).

8. The transformer with waterproof function according to claim 4, characterized in that: The outer side wall of the cylinder (12) is fixedly connected to a controller (19) and a temperature sensor (20), and the fan (13), the temperature sensor (20) and the electric push rod (23) are all electrically connected to the controller (19).

9. The waterproof transformer according to claim 8, characterized in that: The gas injection pipe (15) is fixedly connected to a first electromagnetic flow valve (16) at the connection point with the cylinder (12); the cylinder (12) is fixedly connected to an exhaust pipe (17); the exhaust pipe (17) is fixedly connected to a second electromagnetic flow valve (18) at the connection point with the cylinder (12); and both the first electromagnetic flow valve (16) and the second electromagnetic flow valve (18) are electrically connected to a controller (19).

10. The transformer with waterproof function according to claim 9, characterized in that: The exhaust pipe (17) is fixedly connected to a return pipe (24), a third electromagnetic flow valve (25) is fixedly connected to the connection point between the return pipe (24) and the exhaust pipe (17), and a fourth electromagnetic flow valve (26) is fixedly connected to the outlet end of the exhaust pipe (17), and both the third electromagnetic flow valve (25) and the fourth electromagnetic flow valve (26) are electrically connected to the controller (19).

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