Outdoor distribution transformer

Abstract

The application belongs to the technical field of electric power and discloses an outdoor distribution transformer, which comprises a purification module, a shell fixedly connected below the purification module, an energy storage mechanism, the energy storage mechanism comprising an energy storage fan, a speed reducer box movably sleeved with the upper portion of the energy storage fan, a volute spring movably sleeved with the upper portion of the speed reducer box, a coupling switch, the coupling switch fixedly connecting the mounting platform and the speed reducer box together, and a reset line fixedly connected with a switching mechanism. The switching mechanism can switch the silica gel reaching the use limit to the silica gel not reaching the use limit, so that the problem that the silica gel reaches the use limit in advance or is delayed to reach the use limit due to the weather in the inspection period is solved. The energy storage mechanism is stored by natural wind. When the working silica gel reaches the use limit, the absorbed moisture increases the weight of the silica gel, and then the switching structure is triggered to replace the silica gel not reaching the use limit.

Description

Technical Field

[0001] This invention belongs to the field of power and electrical technology, specifically an outdoor power distribution transformer. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. According to the cooling method, it can be divided into dry-type transformers and oil-immersed transformers. Oil-immersed transformers mainly consist of iron core, windings, oil tank, oil conservator, insulating bushing, breather, and radiator. The breather is responsible for purifying the air inside the oil conservator and the air drawn in from the outside. It mainly absorbs the moisture in the air through desiccant silica gel to slow down the deterioration of transformer oil. However, the breathers currently in use still have some problems.

[0003] Industry regulations require that the desiccant silica gel inside respirators be replaced when it has changed color by two-thirds. Due to climate changes, this may cause two problems during the staff's inspection cycle. First, if the air humidity is high during the inspection cycle, such as during heavy rain, the respirator may quickly reach full capacity, and may fail prematurely when the staff checks it. Second, if the air is dry during the inspection cycle, such as during the hot summer, it may not absorb enough moisture for one cycle or even longer. The staff may replace the unused silica gel during the inspection or wait until the next cycle to replace it, but the air humidity in the next cycle is unknown, which may cause potential hazards. Summary of the Invention

[0004] The purpose of this invention is to provide an outdoor power distribution transformer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an outdoor power distribution transformer, comprising: Purification module; The outer casing is fixedly connected to the bottom of the purification module. An installation platform is located inside the outer casing. A base rod is fixedly connected to the upper part of the installation platform. A silicone tube is movably sleeved on the outside of the base rod. A locking groove is opened at the upper part of the silicone tube. A through straight groove is opened on the outer wall of the base rod. A limit rod is movably sleeved inside the base rod. A horizontal pin is fixedly connected to the upper part of the limit rod. A spring is fixedly connected to the middle part of the limit rod. A chassis is fixedly connected to the lower part of the base rod. A wedge-shaped top rod is movably sleeved inside the chassis. A return spring is fixedly connected to one end of the wedge-shaped top rod. The other end of the return spring is fixedly connected to the inner wall of the chassis. An outer ring is fixedly connected to the lower part of the outer casing. A fixing groove is opened on the radial inner wall of the outer ring. Four auxiliary springs are circumferentially distributed at equal intervals on the bottom inner wall of the outer ring. A support plate is fixedly connected to the upper part of the auxiliary springs. A switching mechanism is fixedly connected to the lower part of the chassis. An energy storage mechanism, comprising an energy storage fan, a gearbox being movably sleeved on the upper part of the energy storage fan, and a spiral spring being movably sleeved on the upper part of the gearbox; A connecting switch, which securely connects the mounting platform to the gearbox; A reset line is fixedly connected to the switching mechanism.

[0006] Preferably, the purification module includes a pair of heating covers and ventilation covers, which are distributed alternately. The heating covers have mesh ventilation openings, and a heat-conducting pipe is fixedly connected to the upper part of the heating covers. The heat-conducting pipe is connected to the transformer oil tank, and an exhaust fan is fixedly connected to the outside of the heat-conducting pipe. An air inlet pipe is fixedly connected to the upper part of the ventilation cover.

[0007] Preferably, the switching mechanism includes a housing, a drive rod is fixedly connected inside the housing, a ratchet is fixedly connected to the upper part of the drive rod, a pawl is fixedly connected to one side of the ratchet on the upper part of the inner wall of the housing, a transmission gear is fixedly connected to the middle part of the drive rod, a gear ring is fixedly connected inside the side wall of the housing, and a transition gear is fixedly connected to the bottom wall of the inner wall of the housing, the transition gear meshing with the gear ring.

[0008] Preferably, the drive rod includes an outer rod, an inner rod is movably sleeved inside the outer rod, a second spring is fixedly connected inside the outer rod, and the other end of the second spring is fixedly connected to the inner rod.

[0009] Preferably, the gearbox includes a second ratchet, a second pawl is fixedly connected to the upper wall inside the gearbox, the second pawl abuts against the second ratchet, a second gear ring is fixedly connected to the side wall inside the gearbox, a drive gear is fixedly connected inside the gearbox, and a second transition gear is provided between the drive gear and the second gear ring, which is movably sleeved at the bottom of the gearbox, and the second transition gear meshes with the drive gear and the second gear ring.

[0010] Preferably, the connecting switch includes an output shaft, an input shaft is disposed below the output shaft, a bushing is movably sleeved near the output shaft and the input shaft, a connecting rod is movably sleeved on the outer wall of the bushing with circumferentially equidistantly distributed, an external magnet is disposed at the connection end of the connecting rod and the bushing, four external keyways are circumferentially equidistantly distributed near the output shaft and the input shaft inside the bushing, four internal keyways are circumferentially equidistantly distributed, an internal magnet is fixedly connected in the internal keyway, and a connecting key abuts inside the internal keyway.

[0011] Preferably, the outer wall of the inner rod is provided with a protruding slider, and the inner wall of the outer rod is provided with a slide rail adapted to the slider.

[0012] Preferably, the magnetic force of the inner magnet is less than that of the outer magnet.

[0013] The beneficial effects of this invention are as follows: 1. This invention, by setting a switching mechanism, can switch silica gel that has reached its usage limit to silica gel that has not yet reached its usage limit, thus solving the problem that silica gel may reach its usage limit prematurely or delayed due to weather conditions during the inspection cycle. Natural wind is used to store energy for the energy storage mechanism. When the working silica gel reaches its usage limit, the absorbed moisture increases its weight, thereby triggering the switching structure to replace the silica gel that has not yet reached its usage limit.

[0014] 2. This invention incorporates a purification module. When air from inside the oil conservator enters the silicone tube through the ventilation hood, it absorbs moisture from the air inside the conservator, thus slowing down the deterioration of the transformer oil. Simultaneously, the used silicone is dehumidified using solar energy through a heating hood and heat pipes from the transformer oil tank. The moisture is then expelled by an exhaust fan, removing moisture from the used silicone and reducing the amount of material used. This indirectly allows the same weight of material to absorb more moisture. When there is sunlight, the used silicone is evaporated using solar energy through the heating hood. When there is no sunlight, the used silicone is evaporated using the heat from the transformer oil tank through the heat pipes. Attached Figure Description

[0015] Figure 1 This is a front view of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a schematic diagram of the inside of the silicone tube of the present invention; Figure 5 This is a side view of the mounting platform of the present invention; Figure 6 This is a schematic diagram of the mounting platform chassis of the present invention; Figure 7 This is a schematic diagram of the drive rod of the present invention; Figure 8 This is a front view of the switching mechanism and energy storage mechanism of the present invention; Figure 9 This is a schematic diagram showing the connection between the switching mechanism and the energy storage mechanism of the present invention; Figure 10 This is a structural diagram of the internal structure of the gearbox of the present invention; Figure 11 This is a schematic diagram of the connection switch of the present invention.

[0016] In the diagram: 1. Purification module; 2. Outer shell; 3. Energy storage mechanism; 4. Connecting switch; 5. Reset wire; 11. Heating cover; 12. Ventilation cover; 13. Heat pipe; 14. Exhaust fan; 15. Inlet pipe; 21. Silicone tube; 22. Base rod; 23. Locking groove; 24. Straight groove; 25. Horizontal pin; 26. Limiting rod; 27. Spring 1; 28. Chassis; 29. ​​Wedge-shaped top rod; 210. Reset spring; 211. Auxiliary spring; 212. Fixing groove; 213. Outer ring; 214. Drive rod; 2141. Inner rod; 2142. Outer rod; 2143. 215. Spring 2; 216. Ratchet 1; 217. Pawl 1; 218. Transmission Gear 1; 219. Gear Ring 1; 220. Housing; 221. Support Plate; 31. Energy Storage Fan; 32. Gearbox; 321. Ratchet 2; 322. Pawl 2; 323. Drive Gear; 324. Transition Gear 2; 325. Gear Ring 2; 33. Scroll Spring; 41. Output Shaft; 42. Input Shaft; 43. Bushing; 44. External Keyway; 45. Internal Keyway; 46. Connecting Key; 47. Internal Magnet; 48. Connecting Rod; 49. External Magnet. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figures 1 to 11 As shown, an embodiment of the present invention provides an outdoor distribution transformer, comprising: Purification module 1; The outer casing 2 is fixedly connected to the bottom of the purification module 1. An installation platform is provided inside the outer casing 2. A base rod 22 is fixedly connected to the upper part of the installation platform. A silicone tube 21 is movably sleeved on the outside of the base rod 22. A locking groove 23 is opened on the upper part of the silicone tube 21. A through straight groove 24 is opened on the outer wall of the base rod 22. A limit rod 26 is movably sleeved inside the base rod 22. A horizontal pin 25 is fixedly connected to the upper part of the limit rod 26. A spring 27 is fixedly connected to the middle part of the limit rod 26. A base plate 2 is fixedly connected to the lower part of the base rod 22. 8. A wedge-shaped push rod 29 is movably sleeved inside the chassis 28. One end of the wedge-shaped push rod 29 is fixedly connected to a return spring 210. The other end of the return spring 210 is fixedly connected to the inner wall of the chassis 28. An outer ring 213 is fixedly connected to the lower part of the outer shell 2. A fixing groove 212 is opened on the radial inner wall of the outer ring 213. Four auxiliary springs 211 are circumferentially distributed at equal intervals on the bottom inner wall of the outer ring 213. A support plate 221 is fixedly connected to the upper part of the auxiliary springs 211. A switching mechanism is fixedly connected to the lower part of the chassis 28. The energy storage mechanism 3 includes an energy storage fan 31, a gearbox 32 is movably sleeved on the upper part of the energy storage fan 31, and a spiral spring 33 is movably sleeved on the upper part of the gearbox 32. Connection switch 4, connection switch 4 fixes the mounting platform and the gearbox 32 together; Reset line 5 is fixedly connected to the switching mechanism.

[0019] The purification module 1 includes a pair of heating covers 11 and ventilation covers 12, which are distributed alternately. The heating covers 11 have mesh ventilation openings. A heat conduction pipe 13 is fixedly connected to the upper part of the heating covers 11. The heat conduction pipe 13 is connected to the transformer oil tank. An exhaust fan 14 is fixedly connected to the outside of the heat conduction pipe 13. An air inlet pipe 15 is fixedly connected to the upper part of the ventilation cover 12.

[0020] With the purification module 1, when the internal volume of the oil conservator changes due to the transformer oil, gas exchange will occur to balance the internal air pressure and atmospheric pressure. The air inside the oil conservator enters the silicone tube 21 through the ventilation hood 12, absorbing the moisture in the air inside the oil conservator and delaying the deterioration of the transformer oil. At the same time, the silicone tube that has been used is dehumidified by the heating hood 11 using solar energy and the heat pipe 13 using the heat energy of the transformer oil tank. The moisture is then discharged by the exhaust fan 14.

[0021] The switching mechanism includes a housing 220, a drive rod 214 fixedly connected inside the housing 220, a ratchet 215 fixedly connected to the upper part of the drive rod 214, a pawl 216 fixedly connected to one side of the ratchet 215 on the upper part of the inner wall of the housing 220, a transmission gear 217 fixedly connected to the middle part of the drive rod 214, a gear ring 219 fixedly connected inside the side wall of the housing 220, and a transition gear 218 fixedly connected to the inner bottom wall of the housing 220, the transition gear 218 meshing with the gear ring 219.

[0022] The energy stored in the spiral spring 33 is released by the switching mechanism to switch the position of the silicone tube 21. When the silicone in the silicone tube 21 reaches the moisture absorption limit, the weight increases, triggering the drive rod 214. At this time, the energy stored in the spiral spring 33 is released, which drives the transmission gear 217 to move. The transmission gear 217 drives the gear ring 219 to rotate through the transition gear 218, thereby driving the entire chassis 28 to complete the switching of the silicone tube 21. At the same time, since the chassis 28 bears a large weight, the rotation speed of the transmission gear 217 driven by the spiral spring 33 must be reduced through the transition gear 218 and the gear ring 219 to increase the torque to drive the chassis 28 to rotate. The ratchet 215 and the pawl 216 ensure that the spiral spring 33 does not release energy prematurely.

[0023] The drive rod 214 includes an outer rod 2142, an inner rod 2141 is movably sleeved inside the outer rod 2142, and a second spring 2143 is fixedly connected inside the outer rod 2142. The other end of the second spring 2143 is fixedly connected to the inner rod 2141.

[0024] By dividing the drive rod 214 into an inner rod 2141 and an outer rod 2142, when the silicone in the silicone tube 21 reaches its usage limit and the weight increases, the inner rod 2141 drives the transmission gear 217 to move downward, preparing for further switching of the silicone tube 21.

[0025] The gearbox 32 includes a ratchet 321, a pawl 322 fixedly connected to the upper wall inside the gearbox 32, the pawl 322 abutting against the ratchet 321, a gear ring 325 fixedly connected to the side wall inside the gearbox 32, a drive gear 323 fixedly connected inside the gearbox 32, and a transition gear 324 movably sleeved between the drive gear 323 and the gear ring 325, which meshes with the drive gear 323 and the gear ring 325.

[0026] By setting up a reduction gearbox 32 to store energy for the spiral spring 33, the ratchet 2 321 and pawl 2 322 inside the reduction gearbox 32 ensure that the energy storage fan 31 will only rotate in one direction. The wind energy blows the energy storage fan 31, which drives the drive gear 323 to rotate. Because the spiral spring 33 has a large elastic force, it needs to pass through the intermediate gear 2 324 and the gear ring 2 325 to store energy for the spiral spring 33. The connecting switch 4 includes an output shaft 41, an input shaft 42 located below the output shaft 41, a sleeve 43 movably sleeved near the output shaft 41 and the input shaft 42, a connecting rod 48 movably sleeved on the outer wall of the sleeve 43 with circumferentially equidistantly distributed, an external magnet 49 located at the connection end between the connecting rod 48 and the sleeve 43, four external keyways 44 circumferentially equidistantly distributed inside the sleeve 43 near the output shaft 41 and the input shaft 42, four internal keyways 45 circumferentially equidistantly distributed, an internal magnet 47 fixedly connected inside the internal keyways 45, and a connecting key 46 abutting inside the internal keyways 45.

[0027] By setting the linkage switch 4, the energy storage mechanism 3 is disconnected when the switching mechanism is working, so as to avoid the energy storage fan 31 interfering with the rotation of the chassis 28.

[0028] The inner rod 2141 has a protruding slider on its outer wall, and the outer rod 2142 has a slide rail adapted to the slider on its inner wall.

[0029] By setting up a slide rail, the inner rod 2141 and the outer rod 2142 do not roll relative to each other when moving up and down, and they still rotate synchronously as a whole.

[0030] Among them, the magnetic force of the inner magnet 47 is less than that of the outer magnet 49.

[0031] By setting the inner magnet 47 and the outer magnet 49, the connecting key 46 enters the outer keyway 44 in the bushing 43 when the chassis 28 rotates, thus disconnecting the movement of the energy storage mechanism 3 from the movement of the chassis 28.

[0032] Working principle and usage process: After the equipment is installed, the energy storage fan 31 rotates under the influence of external wind. After being decelerated by the drive gear 323, the transition gear 324 and the gear ring 325, the torque increases and the energy is stored in the spiral spring 33. Due to the presence of the ratchet 321 and the pawl 322, the energy storage fan 31 can only rotate in the direction of storing energy in the spiral spring 33.

[0033] The chassis 28 divides the silicone tube 21 into two groups. One group removes moisture from the oil conservator, while the other group uses solar energy through the heating cover 11 and heat from the transformer oil tank through the heat pipe 13 to dry the used silicone. After being heated, the moisture moves upward and is discharged through the exhaust fan 14. When the moisture absorbed by the silicone in the silicone tube 21 reaches the usage limit, its weight increases, causing the inner rod 2141 on the drive rod 214 to move downward. At this time, the pawl 216 and ratchet 215 do not restrict the drive rod 214, and at the same time, the transmission gear 217, the transition gear 218, and the gear ring 219 are linked, thereby driving the chassis 28 to rotate. At the same time, the silicone tube 21 will press against the cross pin 25, thereby causing the limit rod 26 to move downward, further pushing out the wedge-shaped top rod 29 inside the chassis 28, so that the wedge-shaped top rod 29 abuts against the fixing groove 212 in the outer ring 213. At this time, the locking of the spiral spring 33 is the responsibility of the wedge-shaped top rod 29.

[0034] To eliminate the impact of the energy storage mechanism 3 on the rotation of the chassis 28, when the silicone tube 21 is switched, the connecting rod 48 on the connecting switch 4 rotates synchronously. Since the connecting rod 48 and the bushing 43 can rotate relative to each other, and since the magnetic force of the outer magnet 49 is greater than that of the inner magnet 47, when the outer magnet 49 at the connection end of the connecting rod 48 and the bushing 43 rotates to the position corresponding to the inner keyway 45, the connecting key 46 will be pulled out of the inner keyway 45. At this time, the energy storage mechanism 3 is disconnected from the chassis 28. When the silicone tube 21 is switched, the inner magnet 47 in the inner keyway 45 will re-enter the connecting key 46 into the inner keyway 45, and the gearbox 32 and the spiral spring 33 in the energy storage mechanism 3 will re-establish a connection. When the used silicone tube 21 removes moisture through the heating cover 11 and the heat conduction pipe 13, its weight decreases. The limiting rod 26 inside the base rod 22 moves upward under the action of spring 27. At the same time, the wedge-shaped top rod 29 inside the chassis 28 retracts under the action of the return spring 210. The fixing groove 212 inside the outer ring 213 does not limit the chassis 28, and the chassis 28 starts to rotate. The silicone tube 21 switches, and this process repeats until the staff performs maintenance. When the staff performs maintenance, they can open the purification module 1, remove the silicone tube 21, and replace it with new dehumidifying silicone. When reinstalling the silicone tube 21, the reset line 5 needs to be pulled to reconnect the ratchet 215 and the pawl 216 so that the spiral spring 33 can restrain it. When the device is working, the switching mechanism, the mounting platform, and the connecting rod 48 on the connecting switch 4 rotate together. The purification module 1 and the outer shell 2 do not move.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An outdoor power distribution transformer, characterized in that: include: Purification module (1); The outer shell (2) is fixedly connected to the bottom of the purification module (1). An installation platform is provided inside the outer shell (2). A base rod (22) is fixedly connected to the upper part of the installation platform. A silicone tube (21) is movably sleeved on the outside of the base rod (22). A locking groove (23) is opened on the upper part of the silicone tube (21). A through straight groove (24) is opened on the outer wall of the base rod (22). A limit rod (26) is movably sleeved inside the base rod (22). A horizontal pin (25) is fixedly connected to the upper part of the limit rod (26). A spring (27) is fixedly connected to the middle part of the limit rod (26). The lower part of the base rod (22) is fixedly connected to... The chassis (28) has a wedge-shaped top rod (29) movably connected inside the chassis (28). One end of the wedge-shaped top rod (29) is fixedly connected to a return spring (210), and the other end of the return spring (210) is fixedly connected to the inner wall of the chassis (28). The lower part of the outer shell (2) is fixedly connected to an outer ring (213). The radial inner wall of the outer ring (213) has a fixing groove (212). The bottom inner wall of the outer ring (213) is fixedly connected to four auxiliary springs (211) distributed circumferentially. The upper part of the auxiliary springs (211) is fixedly connected to a support plate (221). The lower part of the chassis (28) is fixedly connected to a switching mechanism. Energy storage mechanism (3), the energy storage mechanism (3) includes an energy storage fan (31), a gearbox (32) is movably sleeved on the upper part of the energy storage fan (31), and a spiral spring (33) is movably sleeved on the upper part of the gearbox (32). A connecting switch (4) securely connects the mounting platform to the gearbox (32); Reset line (5), which is fixedly connected to the switching mechanism; The switching mechanism includes a housing (220), inside which a drive rod (214) is fixedly connected. A ratchet (215) is fixedly connected to the upper part of the drive rod (214). A pawl (216) is fixedly connected to one side of the ratchet (215) on the upper part of the inner wall of the housing (220). A transmission gear (217) is fixedly connected to the middle of the drive rod (214). A gear ring (216) is fixedly connected to the inside of the side wall of the housing (220). 9) A transition gear 1 (218) is fixedly connected to the inner bottom wall of the housing (220). The transition gear 1 (218) meshes with a gear ring 1 (219). The drive rod (214) includes an outer rod (2142). An inner rod (2141) is movably sleeved inside the outer rod (2142). A spring 2 (2143) is fixedly connected inside the outer rod (2142). The other end of the spring 2 (2143) is fixedly connected to the inner rod (2141). By setting a switching mechanism, silicone that has reached its usage limit can be switched to silicone that has not reached its usage limit. The chassis (28) divides the silicone tube (21) into two groups.

2. An outdoor distribution transformer according to claim 1, characterized in that: The purification module (1) includes a pair of heating covers (11) and ventilation covers (12). The heating covers (11) and ventilation covers (12) are distributed alternately. The heating covers (11) have mesh ventilation openings. A heat-conducting pipe (13) is fixedly connected to the upper part of the heating covers (11). The heat-conducting pipe (13) is connected to the transformer oil tank. An exhaust fan (14) is fixedly connected to the outside of the heat-conducting pipe (13). An air inlet pipe (15) is fixedly connected to the upper part of the ventilation covers (12).

3. An outdoor power distribution transformer according to claim 1, characterized in that: The gearbox (32) includes a ratchet (321), a pawl (322) is fixedly connected to the upper wall inside the gearbox (32), the pawl (322) abuts against the ratchet (321), a gear ring (325) is fixedly connected to the side wall inside the gearbox (32), a drive gear (323) is fixedly connected inside the gearbox (32), a transition gear (324) is provided between the drive gear (323) and the gear ring (325) and is movably sleeved with the bottom of the gearbox (32), the transition gear (324) meshes with the drive gear (323) and the gear ring (325).

4. An outdoor distribution transformer according to claim 1, characterized in that: The connecting switch (4) includes an output shaft (41), an input shaft (42) is provided below the output shaft (41), a bushing (43) is movably sleeved near the output shaft (41) and the input shaft (42), a connecting rod (48) is movably sleeved on the outer wall of the bushing (43) and is circumferentially distributed. An external magnet (49) is provided at the connection end between the connecting rod (48) and the bushing (43). Four external keyways (44) are circumferentially distributed near the output shaft (41) and the input shaft (42) inside the bushing (43). Four internal keyways (45) are circumferentially distributed near the output shaft (41) and the input shaft (42). An internal magnet (47) is fixedly connected in the internal keyway (45). A connecting key (46) abuts against the inside of the internal keyway (45).

5. An outdoor distribution transformer according to claim 1, characterized in that: The outer wall of the inner rod (2141) is provided with a protruding slider, and the inner wall of the outer rod (2142) is provided with a slide rail adapted to the slider.

6. An outdoor distribution transformer according to claim 4, characterized in that: The magnetic force of the inner magnet (47) is less than that of the outer magnet (49).

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