Maintenance-free transformer respirator

Abstract

The invention relates to a transformer respirator, in particular to a maintenance-free transformer respirator, which comprises a drying part, a first heating part, a second heating part and a control part, and is characterized in that the drying part comprises a first drying cup and a second drying cup; an oil filtering part; the inner channel is arranged in the first drying cup and the second drying cup, a first through hole group is formed in the position, corresponding to the first drying cup, of the inner channel, and a second through hole group is formed in the position, corresponding to the second drying cup, of the inner channel; the movable core is arranged in the inner channel in a sliding manner and comprises a first corresponding hole group corresponding to the first through hole group and a second corresponding hole group corresponding to the second through hole group; according to the scheme, the first drying cup and the second drying cup can be subjected to state switching, the drying cup needing dehumidification treatment is converted into the standby state, normal work of the other drying cup is not affected, and during drying agent maintenance, transformer shutdown does not need to be carried out.

Description

Technical Field

[0001] The invention relates to a transformer respirator, in particular to a maintenance-free transformer respirator. Background Art

[0002] A transformer breather is a crucial device used to regulate internal humidity and protect the transformer oil from contamination. Its primary function is to protect the transformer oil from moisture and oxidation, thereby extending the transformer's service life. Generally, the breather is connected to the transformer's oil tank. During operation, the insulating oil inside the transformer heats up, causing it to expand and shrink the gas volume above the oil level. This requires the gas to be exhausted through the breather. As the insulating oil cools, its volume shrinks, increasing the gas volume above the oil level, allowing gas to enter through the breather.

[0003] The core function of the respirator is to dry the gas entering the oil tank through the desiccant inside it. After long-term use, the desiccant absorbs too much moisture, and its effectiveness will be affected. The existing technology is to dry the desiccant by heating, which will produce a lot of water vapor during the drying process. Therefore, the transformer needs to be shut down during the drying process to prevent a large amount of water vapor from entering the insulating oil. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the transformer needs to be shut down when maintaining the desiccant.

[0005] The above technical problem is solved by the following technical solution: The present invention provides a maintenance-free transformer breather, which includes a drying part including a first drying cup and a second drying cup;

[0006] Oil filter unit;

[0007] An inner channel is provided in the first drying cup and the second drying cup, wherein the inner channel has a first through-hole group at a position corresponding to the first drying cup, and a second through-hole group at a position corresponding to the second drying cup;

[0008] a movable core slidably disposed inside the inner channel, comprising a first corresponding hole group corresponding to the first through hole group, and a second corresponding hole group corresponding to the second through hole group;

[0009] The movable core has a first state and a second state. When the movable core is in the first state, the first through hole group and the first corresponding hole group are connected, and the second through hole group and the second corresponding hole group are disconnected. When the movable core is in the second state, the first through hole group and the first corresponding hole group are disconnected, and the second through hole group and the second corresponding hole group are connected. The movable core can switch states by sliding inside the inner channel.

[0010] In a preferred embodiment of the maintenance-free transformer respirator of the present invention: the inner channel includes an expanded diameter section having an inner diameter larger than the diameter of the movable core and a reduced diameter section having an inner diameter adapted to the diameter of the movable core;

[0011] The first through hole group and the second through hole group are opened in the diameter expansion section. When the movable core is in the first state, the first corresponding hole group reaches the diameter expansion section, and the second corresponding hole group reaches the diameter reduction section. When the movable core is in the second state, the first corresponding hole group reaches the diameter reduction section, and the second corresponding hole group reaches the diameter expansion section.

[0012] In a preferred embodiment of the maintenance-free transformer respirator of the present invention: a blocking body is provided on the movable core, and the blocking body can block the first through-hole group and the second through-hole group.

[0013] In a preferred embodiment of the maintenance-free transformer respirator of the present invention: the first through hole group includes an upper air inlet hole and an upper exhaust hole; the second through hole group includes a lower air inlet hole and a lower exhaust hole; the first corresponding hole group includes a first hole corresponding to the upper air inlet hole, and a second hole corresponding to the upper exhaust hole; the second corresponding hole group includes a third hole corresponding to the lower air inlet hole, and a fourth hole corresponding to the lower exhaust hole.

[0014] In a preferred embodiment of the maintenance-free transformer respirator of the present invention, an opening and closing structure is provided between the first hole and the second hole of the movable core, and an opening and closing structure is also provided between the third hole and the fourth hole of the movable core; an assisting passage section is provided on the inner channel, and when the opening and closing structure enters the assisting passage section, gas can pass through the opening and closing structure; when the opening and closing structure leaves the assisting passage section, gas cannot pass through the opening and closing structure.

[0015] In a preferred embodiment of the maintenance-free transformer respirator of the present invention: the opening and closing structure includes an isolation plate fixed inside the movable core, and an upper outlet hole and a lower inlet hole opened on the radial side wall of the movable core, and the upper outlet hole and the lower inlet hole are respectively located on both sides of the isolation plate.

[0016] In a preferred embodiment of the maintenance-free transformer respirator of the present invention, a bottom cabin is further provided on the movable core, and a bottom discharge hole is opened on the bottom cabin, and gas can enter the oil filter part through the bottom discharge hole.

[0017] In a preferred embodiment of the maintenance-free transformer respirator of the present invention: the oil filter portion includes a first oil cup and a second oil cup;

[0018] The maintenance-free transformer breather also includes a switching core, one end of which extends to the interior of the bottom cabin, and the other end of the switching core passes through the second oil cup; the switching core is capable of sliding and has an open state and a closed state. When the switching core is in the closed state, gas can enter the first oil cup through the bottom discharge hole; when the switching core is in the open state, gas can enter the second oil cup through the switching core.

[0019] In a preferred embodiment of the maintenance-free transformer respirator of the present invention: a slidable closed ring is installed on the switching core, the switching core is provided with a top inlet corresponding to the position of the bottom cabin, and a second outlet corresponding to the position of the second oil cup, the outer portion of the switching core is sleeved with a first elastic member that contacts the closed ring; the movable core is further provided with an inner ring inside the bottom cabin; when the switching core is in a closed state, the closed ring can close the top inlet, and when the switching core is in an open state, the closed ring cannot close the top inlet.

[0020] In a preferred embodiment of the maintenance-free transformer respirator of the present invention, the movable core is further provided with a pressing portion and a second elastic member that contacts the pressing portion.

[0021] The beneficial effect of the present invention is that: through the above scheme, the first drying cup and the second drying cup can be switched in state, and the drying cup that needs to be dehumidified can be switched to a standby state without affecting the normal operation of the other drying cup. When performing desiccant maintenance, there is no need to shut down the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0023] Figure 1 The overall structure diagram of the maintenance-free transformer respirator of the present invention is shown;

[0024] Figure 2 The internal structure diagram of the maintenance-free transformer respirator of the present invention is shown;

[0025] Figure 3 Shows a schematic diagram of the inner channel and movable core structure of the present invention;

[0026] Figure 4 shows a schematic diagram of the second state of the movable core;

[0027] Figure 5 shows a schematic diagram of the first state of the movable core;

[0028] Figure 6 Shown Figure 5 Enlarged view of point A in the middle;

[0029] Figure 7 Shows a schematic structural diagram of the oil filter portion of the present invention;

[0030] Figure 8 Shown Figure 7 Enlarged view of point B in the middle.

[0031] Attached mark: 100, drying part; 101, first drying cup; 102, second drying cup; 200, oil filter; 201, first oil cup; 202, second oil cup; 203, external air inlet; 300, inner channel; 301, first through-hole group; 3011, upper air inlet; 3012, upper exhaust; 302, second through-hole group; 3021, lower air inlet; 3022, lower exhaust; 303, diameter expansion section; 3031, first diameter expansion part; 3032, second diameter expansion part; 3033, third diameter expansion part; 304, diameter reduction section; 305, passage-assisting section; 400, movable core; 401, first corresponding hole group ;4011, first hole; 4012, second hole; 402, second corresponding hole group; 4021, third hole; 4022, fourth hole; 403, blocking body; 404, opening and closing structure; 4041, isolation plate; 4042, upper outlet hole; 4043, lower inlet hole; 405, bottom cabin; 406, bottom discharge hole; 407, inner ring; 408, pressing part; 409, second elastic member; 410, upper cavity; 411, lower cavity; 500, switching core; 501, closed ring; 502, top inlet; 503, second outlet; 504, first elastic member; 600, connecting port; 700, third elastic member; 800, driving structure. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0033] The terms used in the present invention are those general terms currently widely used in the art in consideration of the functions regarding the present invention, but these terms may vary according to the intention of ordinary technicians in the art, precedents, or new technologies in the art.

[0034] Reference Figure 1This embodiment provides a maintenance-free transformer respirator, including a drying section 100. A connecting port 600 is provided at the top of the drying section 100. The connecting port 600 is connected to the top of the oil tank of the transformer through a pipe. When the oil temperature inside the transformer rises, the oil body expands, causing the gas storage space at the top of the oil tank to shrink. The gas inside the oil tank enters the drying section 100 through the pipe and the connecting port 600 and is finally discharged to the outside of the respirator. When the oil temperature inside the transformer rises, the oil body shrinks, causing the gas storage space at the top of the oil tank to increase. Under the action of the pressure difference, the external gas enters the interior of the oil tank through the connecting port 600 and the pipe after being dried by the drying section 100. The drying section 100 can prevent the gas entering the oil tank from carrying too much moisture, which affects the quality of the transformer insulating oil.

[0035] During long-term use, the drying section 100 will absorb a large amount of moisture, resulting in poor adsorption and drying effects. In the prior art, a heater is used to heat and dehumidify the desiccant. However, during the heating process, the respirator needs to be stopped to prevent a large amount of water vapor from entering the oil tank due to heating. Dehumidification by heating will cause the respirator to be in a non-working state for a period of time.

[0036] Please continue to refer to Figure 1 In this embodiment, the drying section 100 includes a first drying cup 101 and a second drying cup 102. The first drying cup 101 and the second drying cup 102 are two separate cup bodies. Desiccant is contained in both the first drying cup 101 and the second drying cup 102. Gas can enter the oil tank through the first drying cup 101 or the second drying cup 102. For example, the first drying cup 101 is first used to dry the gas entering the oil tank. After the first drying cup 101 has dried the gas for a period of time, the passage of the first drying cup 101 is closed, and the gas entering the oil tank is dried through the second drying cup 102. At this time, the desiccant in the first drying cup 101 is heated and dehumidified. This cycle is repeated, ensuring that the first drying cup 101 or the second drying cup 102 in operation can both maintain good working conditions, while avoiding the problem of the entire drying section 100 being unable to operate due to heating and dehumidification.

[0037] Please refer to Figure 2 and Figure 4The maintenance-free transformer respirator also includes an oil filter unit 200 and a movable core 400. The movable core 400 is further provided with a bottom cabin 405, and a bottom discharge hole 406 is opened on the bottom cabin 405. When exhausting, the gas in the movable core 400 can enter the oil filter unit 200 through the bottom discharge hole 406. The oil filter unit 200 is installed at the bottom of the drying unit 100. The interior of the oil filter unit 200 is loaded with filtered oil. The bottom end of the movable core 400 needs to be partially submerged in the interior of the filtered oil, especially the bottom discharge hole 406 needs to be submerged in the filtered oil. When the temperature of the transformer insulating oil rises, the gas passes through the drying unit After 100, it is discharged to the external space through the oil filter part 200. When the temperature of the transformer insulating oil decreases, the air storage space at the top of the oil tank increases, and the air pressure decreases. The internal external air will flow into the oil tank under the action of the pressure difference. At this time, although the filtered oil forms a liquid seal, it is not completely sealed. Instead, it allows the gas to penetrate the filtered oil when the pressure difference is sufficient, and then enter the interior of the movable core 400 through the bottom discharge hole 406. When the external air passes through the filtered oil, the filtered oil can absorb dust and small particles in the air to prevent dust and small particles from entering the inner side of the transformer oil tank.

[0038] In this embodiment, the bottom compartment 405 may be fixed inside the oil filter portion 200 , and the movable core 400 is slidably connected to the bottom compartment 405 .

[0039] An external air inlet hole 203 is provided on the oil filter part 200, and the exhausted gas can be discharged to the external space through the external air inlet hole 203, and the outside air can enter the oil filter part 200 through the hole. The oil level of the filtered oil needs to be higher than the bottom discharge hole 406 of the movable core 400 and lower than the opening position of the external air inlet hole 203.

[0040] Please refer to Figure 2 The maintenance-free transformer respirator further includes an inner channel 300 , which is provided in the first drying cup 101 and the second drying cup 102 . The inner channel 300 has a first through hole group 301 opened at a position corresponding to the first drying cup 101 , and a second through hole group 302 opened at a position corresponding to the second drying cup 102 .

[0041] Please continue to refer to Figure 2The movable core 400 is slidably arranged inside the inner channel 300, and the top of the movable core 400 extends to the connecting port 600. When exhausting, the gas can enter the interior of the movable core 400 through the connecting port 600, and when inhaling, the gas can enter the interior of the connecting port 600 through the movable core 400. The movable core 400 includes a first corresponding hole group 401 corresponding to the first through hole group 301, and a second corresponding hole group 402 corresponding to the second through hole group 302; the movable core 400 has a first state and a second state. When the movable core 400 is in the first state, the first through hole group 301 and the first corresponding hole group 401 are connected, and the second through hole group 302 and the second corresponding hole group 402 are disconnected. When the movable core 400 is in the second state, the first through hole group 301 and the first corresponding hole group 401 are disconnected, and the second through hole group 302 and the second corresponding hole group 402 are connected. The movable core 400 can switch states by sliding inside the inner channel 300.

[0042] The movable core 400 may be driven by an electromagnetic structure, for example, an armature structure may be used to drive the movable core 400 to move, or an electromagnet may be used to drive the movable core 400 to move.

[0043] When the movable core 400 is in the first state, the first drying cup 101 is activated and the second drying cup 102 is in the standby state. When the gas is inhaled, it is dried through the first drying cup 101 and finally enters the interior of the transformer oil tank. When the movable core 400 is in the second state, the second drying cup 102 is activated and the first drying cup 101 is in the standby state. When the gas is inhaled, it is dried through the second drying cup 102 and finally enters the interior of the transformer oil tank.

[0044] For details, please continue to refer to Figure 2 The inner channel 300 includes an enlarged diameter section 303 whose inner diameter is larger than the diameter of the movable core 400 and a reduced diameter section 304 whose inner diameter matches the diameter of the movable core 400, wherein the number of the enlarged diameter sections 303 is at least three. Figure 3As shown in the figure, the positions of the three diameter-expanding sections 303 are shown. The first through-hole group 301 and the second through-hole group 302 are opened in the diameter-expanding section 303. When the movable core 400 is in the first state, the first corresponding hole group 401 reaches the diameter-expanding section 303, and the second corresponding hole group 402 reaches the diameter-reducing section 304. When the movable core 400 is in the second state, the first corresponding hole group 401 reaches the diameter-reducing section 304, and the second corresponding hole group 402 reaches the diameter-expanding section 303. When the first corresponding hole group 401 reaches the diameter-expanding section 303 and the second corresponding hole group 402 reaches the diameter-reducing section 304, the first pair The corresponding holes and the first through hole group 301 form a communication relationship. At this time, the gas inside the movable core 400 can enter the interior of the first drying cup 101 through the first corresponding hole group 401 and the first through hole group 301 and then flow back to the interior of the movable core 400. At the same time, the second corresponding hole group 402 is in a closed state because it fits the inner wall of the reduced diameter section 304. Therefore, the gas in the movable core 400 cannot reach the interior of the second drying cup 102 through the second corresponding hole group 402. At this time, the first drying cup 101 is in working state, and the second drying cup 102 is in standby state.

[0045] Please refer to Figure 2 and Figure 3 The first through hole group 301 includes an upper air inlet hole 3011 and an upper exhaust hole 3012; the second through hole group 302 includes a lower air inlet hole 3021 and a lower exhaust hole 3022; the first corresponding hole group 401 includes a first hole 4011 corresponding to the upper air inlet hole 3011, and a second hole 4012 corresponding to the upper exhaust hole 3012; the second corresponding hole group 402 includes a third hole 4021 corresponding to the lower air inlet hole 3021, and a fourth hole 4022 corresponding to the lower exhaust hole 3022, as shown in FIG. Figure 3 The three expanded diameter sections 303 are distributed as a first expanded diameter portion 3031, a second expanded diameter portion 3032, and a third expanded diameter portion 3033. The upper air inlet 3011 is opened at the first expanded diameter portion 3031, the upper exhaust hole 3012 is opened at the end of the second expanded diameter portion 3032 in the first drying cup 101, the lower air inlet 3021 is opened at the end of the second expanded diameter portion 3032 in the second drying cup 102, and the lower exhaust hole 3022 is opened at the third expanded diameter portion 3033.

[0046] like Figure 5 , showing the first state of the active core 400, Figure 5The arrows in the figure show the direction of gas flow during intake. At this time, the first hole 4011 reaches the first expanded diameter portion 3031, the second hole 4012 reaches the second expanded diameter portion 3032, and the third hole 4021 and the fourth hole 4022 respectively separate from the second expanded diameter portion 3032 and the third expanded diameter portion 3033. External gas enters the interior of the oil filter 200 through the external air inlet 203 and enters the movable core 400 under the action of the pressure difference. Inside the movable core 400, it reaches the second hole 4012, passes through the second hole 4012 to reach the interior of the second expanded diameter portion 3032, and then enters the first drying cup 101 through the upper exhaust hole 3012. After being dried by the desiccant inside the first drying cup 101, it reaches the first expanded diameter portion 3031 through the upper air inlet 3011, enters the interior of the movable core 400 through the first hole 4011, and finally enters the transformer oil tank through the connecting port 600.

[0047] For example Figure 4 , showing the second state of the active core 400, Figure 4 The arrows in the figure show the direction of gas flow during air intake. At this time, the first hole 4011 and the second hole 4012 are separated from the first expanded diameter portion 3031 and the second expanded diameter portion 3032 respectively, the third hole 4021 reaches the second expanded diameter portion 3032, and the fourth hole 4022 reaches the third expanded diameter portion 3033. External gas enters the interior of the oil filter 200 from the external air inlet 203, and enters the movable core 400 under the action of the pressure difference, enters the third expanded diameter portion 3033 through the fourth hole 4022, enters the second drying cup 102 through the lower exhaust hole 3022, and after being dried by the desiccant inside the second drying cup 102, reaches the second expanded diameter portion 3032 through the lower air inlet 3021, enters the interior of the movable core 400 through the third hole 4021, and finally enters the oil tank of the transformer through the connecting port 600.

[0048] Through the above solution, the first drying cup 101 and the second drying cup 102 can be switched in state, and the drying cup that needs to be dehumidified can be switched to a standby state without affecting the normal operation of the other drying cup. When performing desiccant maintenance, there is no need to shut down the transformer.

[0049] The dehumidification treatment of the desiccant can refer to the treatment methods in the existing technology, or a heating rod can be used for direct heating. For example, the first drying cup 101 and the second drying cup 102 are both equipped with heating rods, and the first drying cup 101 and the second drying cup 102 are both installed with exhaust valves. When the desiccant is heated and dried, the exhaust valve is opened to allow moisture to be discharged through the exhaust valve.

[0050] As an optional embodiment, please refer to Figure 5 and Figure 6The movable core 400 is provided with an opening and closing structure 404 between the first hole 4011 and the second hole 4012, and the movable core 400 is also provided with an opening and closing structure 404 between the third hole 4021 and the fourth hole 4022; an auxiliary passage section 305 is provided on the inner channel 300, when the opening and closing structure 404 enters the auxiliary passage section 305, the gas can pass through the opening and closing structure 404, and when the opening and closing structure 404 separates from the auxiliary passage section 305, the gas cannot pass through the opening and closing structure 404.

[0051] When the movable core 400 is in the first state, the opening and closing structure 404 between the first hole 4011 and the second hole 4012 reaches a closed state, and the opening and closing structure 404 between the third hole 4021 and the fourth hole 4022 reaches an open state, so that the gas can only flow between the movable core 400 and the first drying cup 101 through the first hole 4011 and the second hole 4012, avoiding the gas directly passing through the movable core 400 and bypassing the first drying cup 101.

[0052] When the movable core 400 is in the second state, the opening and closing structure 404 between the first hole 4011 and the second hole 4012 reaches an open state, and the opening and closing structure 404 between the third hole 4021 and the fourth hole 4022 reaches a closed state, so that the gas can only flow between the movable core 400 and the second drying cup 102 through the third hole 4021 and the fourth hole 4022, avoiding the gas directly passing through the movable core 400 and bypassing the second drying cup 102.

[0053] For details, please refer to Figure 6 The opening and closing structure 404 includes an isolation plate 4041 fixed to the inside of the movable core 400, and an upper outlet hole 4042 and a lower inlet hole 4043 opened on the radial side wall of the movable core 400. The upper outlet hole 4042 and the lower inlet hole 4043 are respectively located on both sides of the isolation plate 4041, and an auxiliary passage section 305 is provided on the inner channel 300.

[0054] The diameter of the passage-assisting section 305 is larger than the diameter of the movable core 400. Therefore, when the upper outlet hole 4042 and the lower inlet hole 4043 both reach the passage-assisting section 305, the gas inside the movable core 400 can be discharged through the upper outlet hole 4042 and re-enter the interior of the movable core 400 through the lower inlet hole 4043, thereby bypassing the isolation plate 4041. At this time, the opening and closing structure 404 is in an open state. When all or one of the upper outlet hole 4042 and the lower inlet hole 4043 separate from the passage-assisting section 305 and reach the reduced diameter section 304, the interior of the reduced diameter section 304 fits into the outer wall of the movable core 400, which can block the upper outlet hole 4042 and the lower inlet hole 4043. At this time, the opening and closing structure 404 is in a closed state.

[0055] Therefore, through the opening and closing structure 404 and the auxiliary section 305, during the oil tank suction stage of the transformer, the sucked gas must pass through one of the first drying cup 101 or the second drying cup 102, preventing the sucked gas from bypassing the first drying cup 101 or the second drying cup 102 through the movable core 400.

[0056] Please refer to Figure 2 and Figure 3 The movable core 400 is provided with a blocking body 403, which can block the first through-hole group 301 and the second through-hole group 302. The blocking body 403 is fixed on the movable core 400 and moves synchronously with the movable core 400. As shown in the figure, there are four blocking bodies 403, which are respectively used to block the upper air inlet 3011, the upper exhaust hole 3012, the lower air inlet 3021, and the lower exhaust hole 3022. Taking the blocking body 403 blocking the upper air inlet 3011 as an example, when the movable core 400 is in the second state, the first hole 4011 reaches the reduced diameter section 304. At this time, the blocking body 403 can fit the inner wall of the upper air inlet 3011 of the inner channel 300, and effectively block the upper air inlet 3011. Therefore, the blocking body 403 has two effects:

[0057] First, the blocking body 403 helps to block the upper air inlet 3011 , which can further prevent gas from entering the interior of the first drying cup 101 or the second drying cup 102 in the standby state, thereby achieving a better sealing effect.

[0058] Second, the blocking body 403 serves to limit the movable core 400. For example, when the movable core 400 moves upward and the blocking body 403 adheres to the inner wall of the upper air inlet 3011 of the inner channel 300, the movable core 400 reaches the highest upward position. At this time, the movable core 400 enters the second state, and the existence of the blocking body 403 can serve to limit the displacement of the movable core 400.

[0059] In the prior art, the filter oil inside the oil filter 200 cannot be replaced without shutting down the machine. During long-term use, a large amount of dust in the gas will be stored in the filter oil, making the filter oil viscous, affecting the exhaust and air intake of the transformer oil tank.

[0060] Therefore, in one embodiment provided in this application, please refer to Figure 7 and Figure 8The oil filter unit 200 includes a first oil cup 201 and a second oil cup 202; the maintenance-free transformer breather also includes a switching core 500, one end of the switching core 500 extends into the interior of the bottom compartment 405, and the other end of the switching core 500 passes through the second oil cup 202; the switching core 500 can slide and has an open state and a closed state. When the switching core 500 is in the closed state, gas can enter the first oil cup 201 through the bottom discharge hole 406. When the switching core 500 is in the open state, gas can enter the second oil cup 202 through the switching core 500.

[0061] The first oil cup 201 and the second oil cup 202 can also be recycled. After the first oil cup 201 has been used for a period of time, the switching core 500 is switched to the open state. At this time, the second oil cup 202 is activated and the first oil cup 201 is in the standby state. The filtered oil inside the oil cup in the standby state can be treated. For example, the filtered oil can be treated with a flocculant. The first oil cup 201 and the second oil cup 202 can be connected to a flocculant adding device. When in the standby state, flocculant is directly added to the standby oil cup through the flocculant adding device to help flocculate and precipitate impurities in the filtered oil.

[0062] Of course, the processing method can also be direct replacement. For example, the first oil cup 201 and the second oil cup 202 are connected to an oil inlet pipe and an oil drain pipe. When the first oil cup 201 is in the standby state, the filtered oil inside the first oil cup 201 is discharged through the oil drain pipe, and then new filtered oil is added to the first oil cup 201 through the oil inlet pipe.

[0063] Specifically, the switching core 500 includes a slidable closed ring 501 installed on it. A slider can be set on the inner wall of the closed ring 501, and a sliding groove is opened on the radial outer wall of the switching core 500 so that the sealing ring and the switching core 500 are slidably connected. The outer part of the switching core 500 is sleeved with a first elastic member 504 that conflicts with the closed ring 501.

[0064] Please refer to Figure 7 and Figure 8 The switching core 500 is provided with a top inlet 502 corresponding to the position of the bottom cabin 405, and a second outlet 503 corresponding to the position of the second oil cup 202. The movable core 400 is also provided with an inner ring 407 inside the bottom cabin 405; when the switching core 500 is in a closed state, the closing ring 501 can close the top inlet 502, and when the switching core 500 is in an open state, the closing ring 501 cannot close the top inlet 502, wherein the inner diameter of the inner ring 407 is adapted to the outer diameter of the switching core 500, and the inner ring 407 divides the internal space of the bottom cabin 405 into an upper chamber 410 and a lower chamber 411.

[0065] For example, when the switching core 500 is in a closed state, the top of the switching core 500 is located in the lower cavity 411. Under the push of the first elastic member 504, the closing ring 501 reaches the corresponding position of the top inlet 502, so that the top inlet 502 is closed, so that the gas inside the movable core 400 cannot enter the interior of the switching core 500 through the top inlet 502. The movable core 400 is connected to the first oil cup 201 through the bottom discharge hole 406.

[0066] For another example, when the switching core 500 is in the open state, the top of the switching core 500 passes through the inner ring 407 and reaches the upper cavity 410. The closed ring 501 conflicts with the inner ring 407 and is misaligned with the top inlet 502 of the switching core 500. At this time, because the switching core 500 blocks the inner ring 407, the upper cavity 410 and the lower cavity 411 are isolated, and the movable core 400 and the switching core 500 are connected. Therefore, the interior of the movable core 400 is connected through the top discharge port and the second outlet 503 and the second oil cup 202.

[0067] In this embodiment, the state switching of the switching core 500 is achieved by its movement relative to the movable core 400. Mainly, when the switching core 500 moves downward relative to the movable core 400, it reaches a closed state, and when the switching core 500 moves upward relative to the movable core 400, it reaches an open state. In order to facilitate operation, the movable core 400 and the switching core 500 share the same drive structure 800.

[0068] The driving structure 800 is arranged below the second oil cup 202 and is an electromagnet structure. When the driving structure 800 is energized, a magnetic force is generated to attract the switching core 500 to move downward. In this embodiment, one end of the first elastic member 504 is in conflict with the closed ring 501, and the other end is in conflict with the bottom cabin 405. A pressing portion 408 and a second elastic member 409 in conflict with the pressing portion 408 are also provided on the movable core 400. When the movable core 400 moves downward, the second elastic member 409 is pressed. Of course, in order to help the switching core 500 reset, a third elastic member 700 needs to be provided between the driving structure 800 and the switching core 500. These elastic members can be springs.

[0069] The specific workflow is:

[0070] First, the driving structure 800 is in the power-off state and does not adsorb the switching core 500. Under the push of the third elastic member 700, the inner ring 407 of the switching core 500 is inserted into the upper cavity 410. At this time, the switching core 500 reaches the open state. At the same time, under the action of the second elastic member 409, the movable core 400 is in the highest position, the first hole 4011 and the second hole 4012 enter the reduced diameter section 304, the third hole 4021 and the fourth hole 4022 reach the expanded diameter section 303, and the movable core 400 is in the second state.

[0071] In this case, the movable core 400 and the switching core 500 are connected to the connecting port 600 , the second drying cup 102 , and the second oil cup 202 , and the first drying cup 101 and the first oil cup 201 are in a standby state.

[0072] When the driving structure 800 is in the energized state, the switching core 500 is adsorbed and the switching core 500 moves downward to separate from the inner ring 407. The first elastic member 504 pushes the closed ring 501 to the position of blocking the top discharge port. At this time, the switching core 500 reaches the closed state, and the upper cavity 410 and the lower cavity 411 of the bottom cabin 405 are connected. In the process of the switching core 500 descending, the first elastic member 504 is pressed by the closed ring 501, and the first elastic member 504 is deformed and transmits force to the movable core 400, causing the movable core 400 to descend to the lowest position. At this time, the first hole 4011 and the second hole 4012 reach the expanded diameter section 303, the third hole 4021 and the fourth hole 4022 reach the reduced diameter section 304, and the movable core 400 is in the first state.

[0073] In this case, the movable core 400 is connected to the connecting port 600 , the first drying cup 101 , and the first oil cup 201 , and the second drying cup 102 and the second oil cup 202 are in a standby state.

[0074] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A maintenance-free transformer respirator, characterized by: include, A drying section (100) comprising a first drying cup (101) and a second drying cup (102); Oil filter (200); An inner channel (300) is provided in the first drying cup (101) and the second drying cup (102), wherein the inner channel (300) is provided with a first through hole group (301) at a position corresponding to the first drying cup (101), and the inner channel (300) is provided with a second through hole group (302) at a position corresponding to the second drying cup (102); a movable core (400) slidably disposed inside the inner channel (300), comprising a first corresponding hole group (401) corresponding to the first through hole group (301), and a second corresponding hole group (402) corresponding to the second through hole group (302); The movable core (400) has a first state and a second state. When the movable core (400) is in the first state, the first through-hole group (301) and the first corresponding hole group (401) are connected, and the second through-hole group (302) and the second corresponding hole group (402) are disconnected. When the movable core (400) is in the second state, the first through-hole group (301) and the first corresponding hole group (401) are disconnected, and the second through-hole group (302) and the second corresponding hole group (402) are connected. The movable core (400) can switch states by sliding inside the inner channel (300).

2. The maintenance-free transformer respirator according to claim 1, characterized in that: The inner channel (300) comprises an expanded diameter section (303) whose inner diameter is larger than the diameter of the movable core (400) and a reduced diameter section (304) whose inner diameter matches the diameter of the movable core (400); The first through hole group (301) and the second through hole group (302) are opened in the diameter expansion section (303); when the movable core (400) is in the first state, the first corresponding hole group (401) reaches the diameter expansion section (303), and the second corresponding hole group (402) reaches the diameter reduction section (304); when the movable core (400) is in the second state, the first corresponding hole group (401) reaches the diameter reduction section (304), and the second corresponding hole group (402) reaches the diameter expansion section (303).

3. The maintenance-free transformer respirator according to claim 1, characterized in that: A blocking body (403) is provided on the movable core (400), and the blocking body (403) is capable of blocking the first through hole group (301) and the second through hole group (302).

4. The maintenance-free transformer respirator according to claim 1, characterized in that: The first through hole group (301) includes an upper air inlet hole (3011) and an upper air outlet hole (3012); The second through hole group (302) includes a lower air inlet hole (3021) and a lower air outlet hole (3022); The first corresponding hole group (401) includes a first hole (4011) corresponding to the upper air inlet hole (3011), and a second hole (4012) corresponding to the upper air outlet hole (3012); The second corresponding hole group (402) includes a third hole (4021) corresponding to the lower air inlet hole (3021), and a fourth hole (4022) corresponding to the lower air outlet hole (3022).

5. The maintenance-free transformer respirator according to claim 4, characterized in that: The movable core (400) is provided with an opening and closing structure (404) between the first hole (4011) and the second hole (4012), and the movable core (400) is also provided with an opening and closing structure (404) between the third hole (4021) and the fourth hole (4022); The inner channel (300) is provided with a passage-assisting section (305); when the opening and closing structure (404) enters the passage-assisting section (305), gas can pass through the opening and closing structure (404); when the opening and closing structure (404) is separated from the passage-assisting section (305), gas cannot pass through the opening and closing structure (404).

6. The maintenance-free transformer respirator according to claim 5, characterized in that: The opening and closing structure (404) comprises an isolation plate (4041) fixed inside the movable core (400), and an upper outlet hole (4042) and a lower inlet hole (4043) opened on the radial side wall of the movable core (400), wherein the upper outlet hole (4042) and the lower inlet hole (4043) are respectively located on both sides of the isolation plate (4041); The inner channel (300) is further provided with a passage-assisting section (305).

7. The maintenance-free transformer respirator according to any one of claims 1 to 6, characterized in that: The movable core (400) is further provided with a bottom compartment (405), and the bottom compartment (405) is provided with a bottom discharge hole (406), through which gas can enter the oil filter (200).

8. The maintenance-free transformer respirator according to claim 7, characterized in that: The oil filter (200) comprises a first oil cup (201) and a second oil cup (202); The maintenance-free transformer respirator further comprises a switching core (500), one end of the switching core (500) extends into the interior of the bottom cabin (405), and the other end of the switching core (500) passes through the second oil cup (202); The switching core (500) is capable of sliding and has an open state and a closed state. When the switching core (500) is in the closed state, gas can enter the first oil cup (201) through the bottom discharge hole (406). When the switching core (500) is in the open state, gas can enter the second oil cup (202) through the switching core (500).

9. The maintenance-free transformer respirator according to claim 8, characterized in that: A slidable closed ring (501) is mounted on the switching core (500), a top inlet (502) corresponding to the position of the bottom cabin (405) and a second outlet (503) corresponding to the position of the second oil cup (202) are provided on the switching core (500), and a first elastic member (504) that contacts the closed ring (501) is sleeved on the outside of the switching core (500); The movable core (400) is further provided with an inner ring (407) inside the bottom cabin (405); When the switching core (500) is in a closed state, the closed ring (501) can close the top inlet (502); when the switching core (500) is in an open state, the closed ring (501) cannot close the top inlet (502).

10. The maintenance-free transformer respirator according to claim 8 or 9, characterized in that: The movable core (400) is further provided with a pressing portion (408) and a second elastic member (409) that contacts the pressing portion (408).

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