Transformer with partitioned heat dissipation function

Abstract

The invention relates to the technical field of transformers, and discloses a transformer with a partitioned heat dissipation function, which comprises an oil tank and a stepped heat dissipation system, transformer oil is stored in the oil tank, and an inner cavity of the oil tank is divided into an oil cavity A, an oil cavity B and an oil cavity C through two heat insulation plates; transformer main bodies are arranged in the oil cavity A, the oil cavity B and the oil cavity C to form a three-phase transformer bank; the stepped heat dissipation system comprises an A-phase heat dissipation device, a B-phase heat dissipation device and a C-phase heat dissipation device of which the heat dissipation levels are sequentially improved. According to the transformer with the partitioned heat dissipation function, a novel transformer heat dissipation structure with partitioned isolation, stepped heat dissipation and cold energy reuse is provided, and the low-temperature-phase heat dissipation device provides pre-cooling for high-temperature-phase hot oil by connecting the heat dissipation devices in series, so that the overall heat dissipation efficiency is systematically improved.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a transformer with partitioned heat dissipation function. Background Technology

[0002] In the field of transformer technology, especially for intelligent large-scale, DC converter oil-immersed transformers, insulation and cooling are mainly achieved through transformer oil. For large three-phase transformers, due to the imbalance of the three-phase load, the heat generated by each phase winding often varies, which can easily lead to localized overheating hotspots inside the transformer, accelerating the aging of insulation materials and seriously affecting the transformer's service life and reliability.

[0003] To address the issue of localized overheating, existing technologies have proposed the concept of zoned heat dissipation. This involves dividing the transformer tank into multiple independent oil chambers using partitions, with each chamber corresponding to a single phase winding and equipped with an independent radiator. This achieves physical isolation and independent heat dissipation for each phase's heat source. However, while this zoned heat dissipation scheme solves the heat diffusion problem, its heat dissipation strategy remains inefficient. Each phase's heat dissipation system operates completely independently, lacking coordination and exhibiting significant drawbacks: the heat dissipation margin of the low-temperature phase radiator is not effectively utilized, while the high-temperature phase radiator bears the entire heat load alone. This "each fighting their own battle" model fails to optimize heat dissipation efficiency at the system level. The high-temperature phase radiator always operates near its maximum load, hindering further improvements in the overall transformer heat dissipation efficiency and proving inflexible and uneconomical in dealing with sudden overloads.

[0004] Therefore, in order to solve the above-mentioned technical problems in the prior art, a transformer with partitioned heat dissipation function is proposed. Summary of the Invention

[0005] This invention provides a transformer with partitioned heat dissipation function, featuring a novel transformer heat dissipation structure of "partitioned isolation, tiered heat dissipation, and cold energy reuse". By connecting the heat sinks of each phase in series, the low-temperature phase heat sink provides pre-cooling for the hot oil of the high-temperature phase, thereby systematically improving the overall heat dissipation efficiency. This solves the problems mentioned in the background art, such as the failure of existing partitioned heat dissipation transformers to optimize heat dissipation efficiency at the system level, the high-temperature phase heat sink always operating near the maximum load, which restricts the further improvement of the overall heat dissipation efficiency of the transformer, and the lack of flexibility and economy in dealing with sudden overloads.

[0006] The present invention provides the following technical solution: a transformer with partitioned heat dissipation function, including an oil tank and a stepped heat dissipation system. The oil tank stores transformer oil. The inner cavity of the oil tank is divided into oil cavity A, oil cavity B and oil cavity C by two heat insulation plates. The oil cavity A, oil cavity B and oil cavity C are each equipped with a transformer body to form a three-phase transformer group.

[0007] The tiered heat dissipation system includes an A-phase radiator, a B-phase radiator, and a C-phase radiator with progressively higher heat dissipation levels. The A-phase radiator includes an A-phase heat sink, and the input end of the A-phase heat sink is connected to the oil chamber A through an A-phase oil inlet pipe.

[0008] The B-phase radiator includes a B-phase heat sink, the input end of which is connected to the oil chamber B through a B-phase oil inlet pipe, and the output end of the A-phase heat sink is connected to the B-phase oil inlet pipe through an A-phase oil outlet pipe.

[0009] The C-phase radiator includes a C-phase heat sink. The input end of the C-phase heat sink is connected to the oil chamber C through a C-phase oil inlet pipe. The output end of the B-phase heat sink is connected to the C-phase oil inlet pipe through a B-phase oil outlet pipe. The output end of the C-phase heat sink is connected to the oil chamber A, the oil chamber B, and the oil chamber C through a C-phase oil outlet pipe.

[0010] As an optional embodiment of the transformer with partitioned heat dissipation function described in this invention, wherein: temperature sensors are provided in oil chamber A, oil chamber B and oil chamber C for monitoring oil temperature, and fans are provided on phase A radiator, phase B radiator and phase C radiator;

[0011] The C-phase oil outlet pipe is connected to the oil chamber A through the A-phase cold oil pipe, the C-phase oil outlet pipe is connected to the oil chamber B through the B-phase cold oil pipe, and the C-phase oil outlet pipe is connected to the oil chamber C through the C-phase cold oil pipe.

[0012] As an optional embodiment of the transformer with partitioned heat dissipation function described in this invention, the oil temperature in the A-phase oil outlet pipe is lower than the oil temperature in the B-phase oil inlet pipe, which serves to pre-cool the transformer oil output from the oil chamber B.

[0013] The oil temperature in the B-phase oil outlet pipe is lower than the oil temperature in the C-phase oil inlet pipe, which serves to pre-cool the transformer oil output from the oil chamber C.

[0014] As an optional solution for a transformer with partitioned heat dissipation function as described in this invention, the tiered heat dissipation system further includes an AB mutual aid valve assembly. When the oil temperature in the oil chamber B exceeds a set threshold, the AB mutual aid valve assembly provides supplementary heat dissipation to the oil chamber B.

[0015] The AB mutual aid valve assembly includes an AB mutual aid pipe. The A-phase oil outlet pipe is connected to the oil chamber B through the AB mutual aid pipe, thereby diverting the transformer oil cooled by the A-phase radiator to the oil chamber B.

[0016] As an optional solution for a transformer with partitioned heat dissipation function as described in this invention, the cascade heat dissipation system further includes a BC mutual aid valve assembly. When the oil temperature in the oil chamber C exceeds a set threshold, the BC mutual aid valve assembly provides supplementary heat dissipation to the oil chamber C.

[0017] The BC mutual aid valve assembly includes a BC mutual aid pipe, and the B-phase oil outlet pipe is connected to the oil chamber C through the BC mutual aid pipe, thereby diverting the transformer oil cooled by the B-phase radiator to the oil chamber C.

[0018] As an optional embodiment of the transformer with partitioned heat dissipation function described in this invention, the oil tank is further provided with a current diversion mechanism, the A-phase oil inlet pipe is connected to the current diversion mechanism through the A-phase current diversion pipe, the B-phase oil inlet pipe is connected to the current diversion mechanism through the B-phase current diversion pipe, and the C-phase oil inlet pipe is connected to the current diversion mechanism through the C-phase current diversion pipe.

[0019] When the transformer oil cooled by the A-phase radiator is diverted into the oil chamber B, the transformer oil in the B-phase oil inlet pipe is diverted into the A-phase oil inlet pipe and the C-phase oil inlet pipe through the diversion mechanism;

[0020] When the transformer oil cooled by the B-phase radiator is diverted into the oil chamber C, the transformer oil in the C-phase oil inlet pipe is diverted into the A-phase oil inlet pipe and the B-phase oil inlet pipe through the diversion mechanism.

[0021] As an optional solution for a transformer with partitioned heat dissipation function according to the present invention, wherein: the current diversion mechanism includes a mounting base disposed on the oil tank, a turntable rotatably disposed on the mounting base, and a one-way valve disposed on the turntable;

[0022] The mounting base is provided with a first connecting hole, a second connecting hole and a third connecting hole in a counterclockwise direction. The first connecting hole, the second connecting hole and the third connecting hole are equidistant in the circumferential direction. The first connecting hole is connected to the A-phase drainage pipe, the second connecting hole is connected to the B-phase drainage pipe and the third connecting hole is connected to the C-phase drainage pipe.

[0023] The turntable has a fourth connecting hole, a fifth connecting hole, and a sixth connecting hole arranged in a counterclockwise direction, and the fourth connecting hole, the fifth connecting hole, and the sixth connecting hole are equidistant in the circumferential direction.

[0024] As an optional embodiment of the transformer with partitioned heat dissipation function described in this invention, wherein: the input end of the one-way valve is connected to the fourth connecting hole, a proportional valve assembly is provided on the turntable, the proportional valve assembly is connected to the output end of the one-way valve, and the fifth connecting hole and the sixth connecting hole are both connected to the proportional valve assembly.

[0025] As an optional solution for a transformer with partitioned heat dissipation function as described in this invention, the current diversion mechanism further includes a rotating component, the rotating component including a motor disposed on the mounting base, a first gear disposed on the output shaft of the motor, and a second gear disposed on the turntable, the second gear meshing with the first gear.

[0026] As an optional solution of the transformer with partitioned heat dissipation function described in the present invention, wherein: the proportional valve assembly includes a valve body disposed on the mounting base, one end of the valve body is provided with an oil inlet groove, and the oil inlet groove is connected to the output end of the one-way valve;

[0027] Two oil outlet grooves are provided at the other end of the valve body, and two throttling holes are provided inside the valve body. The oil inlet groove is connected to the two oil outlet grooves through the two throttling holes respectively. A valve core is slidably arranged inside the valve body, and the two ends of the valve core are elastically connected to the inner walls of the two sides of the valve body through two springs respectively.

[0028] The present invention has the following beneficial effects:

[0029] 1. This transformer with zoned heat dissipation function significantly improves heat dissipation efficiency and reduces operating energy consumption: Through the stepped series design, the cooling capacity of the low-temperature phase radiator is fully utilized to pre-cool the hot oil of the subsequent high-temperature phase, which greatly reduces the load on the high-temperature phase radiator. Thus, while achieving the same heat dissipation effect, the energy consumption of cooling devices such as fans is reduced, and energy-saving operation is realized.

[0030] 2. This transformer with zoned heat dissipation function optimizes thermal management and extends equipment life: This structure forces the oil with the lowest temperature to flow through the entire heat dissipation path, and finally mixes fully with the hot oil of each phase in the mixing shunt. This can more effectively balance the overall temperature of the three-phase oil chamber, avoid local overheating, slow down the aging of insulating oil, and significantly improve the operating reliability and service life of the transformer.

[0031] 3. This transformer with zoned heat dissipation function has a mutual aid pipeline design that forms a "touch-activated" directional emergency heat dissipation channel. When a specific phase overheats, it can actively and accurately introduce the low-temperature cold oil generated by the front heat sink into the overheated oil chamber, realizing the mode switching from "system balanced heat dissipation" to "precise temperature control of key targets". It retains the basic energy efficiency of tiered heat dissipation and achieves an overheat emergency response speed and cooling efficiency far exceeding that of traditional designs. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0033] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0034] Figure 3 This is a schematic diagram of the tiered heat dissipation system in this invention.

[0035] Figure 4 This is a cross-sectional schematic diagram of the drainage mechanism when the oil cavity C is overheated in this invention.

[0036] Figure 5 This is a cross-sectional schematic diagram of the drainage mechanism when the oil chamber B is overheated in this invention.

[0037] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at point I.

[0038] Figure 7 This is a cross-sectional schematic diagram of the drainage mechanism when oil chamber A is overheated in this invention.

[0039] Figure 8 This is an exploded structural diagram of the drainage mechanism in this invention.

[0040] In the diagram: 100, oil tank; 110, heat insulation plate; 120, oil chamber A; 130, oil chamber B; 140, oil chamber C; 150, temperature sensor; 200, transformer body; 300, cascade cooling system; 310, phase A radiator; 311, phase A heat sink; 312, phase A oil inlet pipe; 313, phase A oil outlet pipe; 314, solenoid valve one; 315, solenoid valve two; 316, phase A cold oil pipe; 317, solenoid valve three; 318, phase A drain. Pipeline; 319. Solenoid Valve 4; 320. Phase B Radiator; 321. Phase B Heatsink; 322. Phase B Oil Inlet Pipeline; 323. Phase B Oil Outlet Pipeline; 324. Solenoid Valve 5; 325. Solenoid Valve 6; 326. Phase A Cold Oil Pipeline; 327. Solenoid Valve 7; 328. Phase B Drainage Pipeline; 329. Solenoid Valve 8; 330. Phase C Radiator; 331. Phase C Heatsink; 332. Phase C Oil Inlet Pipeline; 333. Phase C Oil Outlet Pipeline; 334. Solenoid Valve 9 336. C-phase cold oil pipeline; 337. Solenoid valve 10; 338. C-phase drainage pipeline; 339. Solenoid valve 11; 340. AB mutual aid valve assembly; 341. AB mutual aid pipeline; 342. Solenoid valve 12; 343. Solenoid valve 13; 350. BC mutual aid valve assembly; 351. BC mutual aid pipeline; 352. Solenoid valve 14; 353. Solenoid valve 15; 360. Fan; 400. Drainage mechanism; 410. Mounting base; 411. First connecting hole; 412. Second connecting hole; 413. Third connecting hole; 420. Turntable; 421. Fourth connecting hole; 422. Fifth connecting hole; 423. Sixth connecting hole; 430. Check valve; 440. Proportional valve assembly; 441. Valve body; 442. Oil inlet groove; 443. Oil outlet groove; 444. Throttling orifice; 445. Valve core; 446. Spring; 447. Connecting groove; 450. Rotating assembly; 451. Motor; 452. First gear; 453. Second gear. Detailed Implementation

[0041] 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.

[0042] Example 1, please refer to Figures 1-3A transformer with partitioned heat dissipation function includes an oil tank 100 and a stepped heat dissipation system 300. The oil tank 100 stores transformer oil. The inner cavity of the oil tank 100 is divided into oil chambers A120, B130 and C140 by two heat insulation plates 110. Each of the oil chambers A120, B130 and C140 is equipped with a transformer body 200 to form a three-phase transformer group.

[0043] The tiered heat dissipation system 300 includes an A-phase radiator 310, a B-phase radiator 320, and a C-phase radiator 330 with progressively higher heat dissipation levels. The A-phase radiator 310 includes an A-phase heat sink 311, and the input end of the A-phase heat sink 311 is connected to the oil chamber A120 through the A-phase oil inlet pipe 312.

[0044] The B-phase radiator 320 includes a B-phase heat sink 321. The input end of the B-phase heat sink 321 is connected to the oil chamber B130 through the B-phase oil inlet pipe 322, and the output end of the A-phase heat sink 311 is connected to the B-phase oil inlet pipe 322 through the A-phase oil outlet pipe 313.

[0045] The C-phase radiator 330 includes a C-phase heat sink 331. The input end of the C-phase heat sink 331 is connected to the oil chamber C140 through the C-phase oil inlet pipe 332. The output end of the B-phase heat sink 321 is connected to the C-phase oil inlet pipe 332 through the B-phase oil outlet pipe 323. The output end of the C-phase heat sink 331 is connected to the oil chambers A120, B130, and C140 through the C-phase oil outlet pipe 333.

[0046] Temperature sensors 150 are installed in oil chambers A120, B130 and C140 to monitor oil temperature. Fans 360 are installed on phase A radiator 310, phase B radiator 320 and phase C radiator 330.

[0047] The C-phase oil outlet pipe 333 is connected to the oil chamber A120 via the A-phase cold oil pipe 316, the C-phase oil outlet pipe 333 is connected to the oil chamber B130 via the B-phase cold oil pipe 326, and the C-phase oil outlet pipe 333 is connected to the oil chamber C140 via the C-phase cold oil pipe 336.

[0048] The oil temperature in phase A oil outlet pipe 313 is lower than the oil temperature in phase B oil inlet pipe 322, which serves to pre-cool the transformer oil output from oil chamber B130.

[0049] The oil temperature in phase B oil outlet pipe 323 is lower than the oil temperature in phase C oil inlet pipe 332, which serves to pre-cool the transformer oil output from oil chamber C140.

[0050] In this embodiment: as follows Figure 1As shown, two heat insulation plates 110 are equidistantly arranged in the left-right direction inside the oil tank 100, dividing the inner cavity of the oil tank 100 into oil chambers A120, B130, and C140 from right to left. Typically, a large-scale intelligent DC-DC converter three-phase transformer group consists of three transformer bodies 200, each including a core and windings. The three transformer bodies 200 are respectively installed in oil chambers A120, B130, and C140. Due to the imbalance of the three-phase load, the heat generated by each phase winding often differs. Therefore, the rated loads of the three transformer bodies 200 are different. The three transformer bodies 200 are installed in order of increasing rated load from right to left. Correspondingly, the oil temperature in the three chambers also increases gradually from right to left.

[0051] The following improvements are made to the traditional unpartitioned or partitioned heat dissipation technology, which still uses three independent heat dissipation devices to cool the three chambers. The three heat dissipation devices form a flow guiding mechanism 400, with the A-phase radiator 310, B-phase radiator 320, and C-phase radiator 330 exhibiting progressively increasing heat dissipation loads from right to left. Each device is based on an oil inlet pipe, heat sink fins, an oil outlet pipe, and a fan 360. The fan 360 transforms natural air convection into forced convection, thereby enhancing the heat dissipation capacity of the radiators.

[0052] The working principle of tiered cooling: With the hot oil in oil chamber A120 set at 70°C, radiator 310 in phase A can cool the 70°C oil to a lower temperature, such as 60°C. The hot oil in oil chamber B130 is at 75°C. Its inlet mixes the 60°C cooled oil output from radiator 310 in phase A with the 75°C hot oil from oil chamber B130, thus its actual inlet temperature is pre-cooled to 70°C. Radiator 320 in phase B then cools the 70°C oil to another temperature, such as 68°C.

[0053] At this point, the temperature difference between the radiator and the environment decreases, and because the inlet temperature is lower, its heat dissipation requirement is less than when it operates independently. The hot oil in oil chamber C140 is 85°C. Its inlet mixes the 68°C cold oil output from phase B radiator 320 with the 85°C hot oil from oil chamber C140, thus its actual inlet temperature is pre-cooled to 75°C, and the output oil reaches the target temperature of 72°C. The temperature difference between phase C radiator 330 and the environment further decreases, significantly reducing the amount of heat it needs to handle. By utilizing the cold oil output from the front-end radiator to "pre-cool" the hot oil in the rear-end radiator, the inlet temperature and heat dissipation load of the rear-end radiator, phase C radiator 330, which is typically the most heavily loaded and hottest, is significantly reduced.

[0054] Example 2 is an improvement upon Example 1. For details, please refer to [link / reference]. Figures 1-3The cascade cooling system 300 also includes an AB mutual aid valve assembly 340, which provides supplemental cooling to the oil chamber B130 when the oil temperature in the oil chamber B130 exceeds a set threshold.

[0055] The AB mutual aid valve assembly 340 includes an AB mutual aid pipe 341. The A-phase oil outlet pipe 313 is connected to the oil chamber B130 through the AB mutual aid pipe 341, thereby diverting the transformer oil cooled by the A-phase radiator 310 to the oil chamber B130.

[0056] The cascade cooling system 300 also includes a BC mutual aid valve assembly 350, which provides supplemental cooling to the oil chamber C140 when the oil temperature in the oil chamber C140 exceeds a set threshold.

[0057] The BC mutual aid valve assembly 350 includes a BC mutual aid pipe 351. The B-phase oil outlet pipe 323 is connected to the oil chamber C140 through the BC mutual aid pipe 351, thereby diverting the transformer oil cooled by the B-phase radiator 320 to the oil chamber C140.

[0058] A solenoid valve 1 314 is installed between the input end of the A-phase oil inlet pipe 312 and the A-phase heat sink 311; a solenoid valve 2 315 is installed between the A-phase oil outlet pipe 313 and the B-phase oil inlet pipe 322; a solenoid valve 317 is installed between the C-phase oil outlet pipe 333 and the A-phase cold oil pipe 316; and a solenoid valve 4 319 is installed between the A-phase oil inlet pipe 312 and the A-phase drainage pipe 318.

[0059] A solenoid valve 324 is installed between the input end of the B-phase oil inlet pipe 322 and the B-phase heat sink 321; a solenoid valve 325 is installed between the B-phase oil outlet pipe 323 and the C-phase oil inlet pipe 332; a solenoid valve 327 is installed between the C-phase oil outlet pipe 333 and the B-phase cold oil pipe 326; and a solenoid valve 329 is installed between the B-phase oil inlet pipe 322 and the B-phase drainage pipe 328.

[0060] A solenoid valve 334 is installed between the input end of the C-phase oil inlet pipe 332 and the C-phase heat sink 331; a solenoid valve 337 is installed between the C-phase oil outlet pipe 333 and the C-phase cold oil pipe 336; and a solenoid valve 339 is installed between the C-phase oil inlet pipe 332 and the C-phase drainage pipe 338.

[0061] In this embodiment, it is also considered that when changes in operating conditions cause an occasional overheating of the oil temperature in a certain cavity, an emergency treatment of mutual heat dissipation is carried out on the basis of tiered heat dissipation.

[0062] The solenoid valves installed at each pipeline are used to control the opening and closing of the pipeline. Under normal conditions, solenoid valves 1-314, 3-317, 5-324, 7-327, 9-334, and 10-337 are in the open state, while solenoid valves 2-315, 4-319, 6-325, 8-329, and 11-339 are in the closed state.

[0063] When the oil temperature in oil chamber C140 is overheated, open solenoid valves 14 (352) and 15 (353). At this time, the pressure of the cold oil return pipe in the adjacent oil chamber B130, which has a lower temperature, is usually slightly higher than that in the overheated oil chamber C140. Because the oil viscosity in the overheated chamber is low and the flow resistance may be slightly smaller, and the oil pump may be running at the same speed, the low-temperature cold oil will naturally flow into the overheated oil chamber C140 through the BC mutual aid pipe 351.

[0064] At the same time, the change in flow resistance passively accelerated the hot oil discharge rate of the superheated oil chamber C140.

[0065] When the oil temperature in oil chamber B130 is too high, open solenoid valve 12 342 and solenoid valve 13 343, and the low-temperature cold oil will naturally flow into oil chamber B130 through AB mutual aid pipe 341.

[0066] Example 3 is an improvement upon Example 2. For details, please refer to [link / reference]. Figures 3-8 The oil tank 100 is also equipped with a diversion mechanism 400. The A-phase oil inlet pipe 312 is connected to the diversion mechanism 400 through the A-phase diversion pipe 318, the B-phase oil inlet pipe 322 is connected to the diversion mechanism 400 through the B-phase diversion pipe 328, and the C-phase oil inlet pipe 332 is connected to the diversion mechanism 400 through the C-phase diversion pipe 338.

[0067] When the transformer oil cooled by the A-phase radiator 310 is diverted into the oil chamber B130, the transformer oil in the B-phase oil inlet pipe 322 is diverted into the A-phase oil inlet pipe 312 and the C-phase oil inlet pipe 332 through the diversion mechanism 400.

[0068] When the transformer oil cooled by the B-phase radiator 320 is diverted into the oil chamber C140, the transformer oil in the C-phase oil inlet pipe 332 is diverted into the A-phase oil inlet pipe 312 and the B-phase oil inlet pipe 322 through the diversion mechanism 400.

[0069] The oil tank 100 is also equipped with a diversion mechanism 400. The A-phase oil inlet pipe 312 is connected to the diversion mechanism 400 through the A-phase diversion pipe 318, the B-phase oil inlet pipe 322 is connected to the diversion mechanism 400 through the B-phase diversion pipe 328, and the C-phase oil inlet pipe 332 is connected to the diversion mechanism 400 through the C-phase diversion pipe 338.

[0070] When the transformer oil cooled by the A-phase radiator 310 is diverted into the oil chamber B130, the transformer oil in the B-phase oil inlet pipe 322 is diverted into the A-phase oil inlet pipe 312 and the C-phase oil inlet pipe 332 through the diversion mechanism 400.

[0071] When the transformer oil cooled by the B-phase radiator 320 is diverted into the oil chamber C140, the transformer oil in the C-phase oil inlet pipe 332 is diverted into the A-phase oil inlet pipe 312 and the B-phase oil inlet pipe 322 through the diversion mechanism 400.

[0072] The input end of the one-way valve 430 is connected to the fourth connecting hole 421. A proportional valve assembly 440 is provided on the turntable 420. The proportional valve assembly 440 is connected to the output end of the one-way valve 430. The fifth connecting hole 422 and the sixth connecting hole 423 are both connected to the proportional valve assembly 440.

[0073] The drainage mechanism 400 also includes a rotating assembly 450, which includes a motor 451 mounted on a mounting base 410. A first gear 452 is mounted on the output shaft of the motor 451, and a second gear 453 is mounted on the turntable 420. The second gear 453 meshes with the first gear 452.

[0074] In this embodiment: When the oil chamber C140 overheats, the pressure of the transformer oil output from the oil chamber C140 increases due to the additional supply of some cold oil from the B-phase oil outlet pipe 323. At this time, the amount of hot oil discharged from the oil chamber C140 into the C-phase heat sink 331 through the C-phase oil inlet pipe 332 increases. To alleviate the heat dissipation pressure on the C-phase heat sink 331, a diversion mechanism 400 is used to divert some of the hot oil in the C-phase oil inlet pipe 332 to the B-phase oil inlet pipe 322 and the A-phase oil inlet pipe 312, thereby sharing the heat dissipation pressure using the B-phase oil inlet pipe 322, which has a reduced heat dissipation pressure, and the normally functioning A-phase oil inlet pipe 312.

[0075] Similarly, when the oil chamber B130 is overheated, some of the hot oil in the B-phase oil inlet pipe 322 is diverted to the C-phase oil inlet pipe 332 and the A-phase oil inlet pipe 312, so that the heat dissipation pressure is shared by the A-phase oil inlet pipe 312, which has reduced heat dissipation pressure at this time, and the normal C-phase oil inlet pipe 332.

[0076] Specifically, with Figure 4 For example, the mounting base 410 has a first connecting hole 411 on its right side, a second connecting hole 412 on its upper side, and a third connecting hole 413 on its left side. The first connecting hole 411, the second connecting hole 412, and the third connecting hole 413 are spaced 120° apart from each other and are connected to the A-phase drainage pipe 318, the B-phase drainage pipe 328, and the C-phase drainage pipe 338, respectively.

[0077] The turntable 420 is also provided with a fourth connecting hole 421, a fifth connecting hole 422, and a sixth connecting hole 423 that are spaced 120° apart. Only when one of the temperature sensors 150 detects that the oil temperature in oil chamber B130 or oil chamber C140 exceeds its respective set threshold, the control solenoid valves 11, 8, and 4 open, allowing the hot oil in the C-phase oil inlet pipe 332, B-phase oil inlet pipe 322, and A-phase oil inlet pipe 312 to be diverted to the C-phase drainage pipe 338, B-phase drainage pipe 328, and A-phase drainage pipe 318.

[0078] When the oil chamber C140 overheats, the motor 451 drives the first gear 452 to rotate, which in turn drives the second gear 453 and the turntable 420 to rotate, causing the turntable 420 to rotate to... Figure 4 The position shown is the first station. At this time, the hot oil in the C-phase oil inlet pipe 332 passes through the check valve 430, and then passes through the C-phase drainage pipe 338, the third connecting hole 413, the inlet of the check valve 430, and the outlet of the check valve 430 into the proportional valve assembly 440.

[0079] The proportional valve assembly 440 can proportionally divide the incoming transformer oil into two parts. One part passes sequentially through the fifth connecting hole 422, the first connecting hole 411, and the A-phase drain pipe 318 into the A-phase oil inlet pipe 312, and then mixes with the hot oil coming out of the oil chamber A120 into the A-phase heat sink 311. The other part passes sequentially through the sixth connecting hole 423, the second connecting hole 412, and the B-phase drain pipe 328 into the B-phase oil inlet pipe 322, and then mixes with the hot oil coming out of the oil chamber B130 into the B-phase heat sink 321.

[0080] When the oil temperature in oil chamber C140 drops below the threshold, solenoid valves 11339, 8329, and 4319 are closed.

[0081] When oil chamber B130 overheats, turntable 420 rotates to... Figure 5 The position shown is the second station. At this time, the hot oil in the B-phase oil inlet pipe 322 passes through the one-way valve 430, and then passes through the B-phase drainage pipe 328, the second connecting hole 412, the inlet of the one-way valve 430, and the outlet of the one-way valve 430 into the proportional valve assembly 440.

[0082] The proportional valve assembly 440 can proportionally divide the incoming transformer oil into two parts. One part passes sequentially through the fifth connecting hole 422, the third connecting hole 413, and the C-phase drain pipe 338 into the C-phase oil inlet pipe 332, and then mixes with the hot oil coming out of the oil chamber C140 into the C-phase heat sink 331. The other part passes sequentially through the sixth connecting hole 423, the first connecting hole 411, and the A-phase drain pipe 318 into the A-phase oil inlet pipe 312, and then mixes with the hot oil coming out of the oil chamber A120 into the A-phase heat sink 311.

[0083] Furthermore, when the oil temperature in oil chamber A120 is excessively high (a relatively low probability event), the optimal cooling oil available is only the cooling oil exiting from phase C oil outlet pipe 333. In this case, the opening of solenoid valves 7 and 10 can be temporarily closed or reduced, allowing the mixed cooling oil from phase C oil outlet pipe 333 to be concentrated and supplied to oil chamber A120 via phase A cooling oil pipe 316. The additional heat dissipation load of phase A heat sink 311 is then dissipated through… Figure 7 The workstation shown has been resolved.

[0084] The specific structure and working principle of the one-way valve 430 are conventional technical methods and will not be elaborated upon.

[0085] Example 4 is an improvement upon Example 3. For details, please refer to [link / reference]. Figures 4-8 The proportional valve assembly 440 includes a valve body 441 disposed on a mounting base 410. One end of the valve body 441 is provided with an oil inlet groove 442, which is connected to the output end of the one-way valve 430.

[0086] Two oil outlet grooves 443 are provided at the other end of the valve body 441, and two throttling holes 444 are provided inside the valve body 441. The oil inlet groove 442 is connected to the two oil outlet grooves 443 through the two throttling holes 444 respectively. A valve core 445 is slidably arranged inside the valve body 441. The two ends of the valve core 445 are elastically connected to the inner walls of both sides of the valve body 441 through two springs 446 respectively.

[0087] In this embodiment, transformer oil enters the valve body 441 through the inlet sump 442, and then splits into two parts, each flowing through a throttling orifice 444 to the outlet sump 443. When the cylinders connected to the two outlet sump 443 bear the same load during charging and discharging, the gas entering the inlet sump 442 is split into two parts and exits from the two outlet sump 443 respectively. The specific amount of these two split parts is controlled by adjusting the area of ​​the two throttling orifices 444. If the areas of the two throttling orifices 444 are equal, the proportional valve assembly 440 distributes the oil evenly. If the area of ​​one of the throttling orifices 444 is smaller, the transformer oil flowing out through that orifice 444 will be slower, resulting in a smaller total output.

[0088] Taking the case where the two throttling orifices 444 have equal areas as an example, when the loads at the two oil outlets 443 are different, a pressure difference will be generated. This pressure difference is fed back to the valve core 445, causing the valve core 445 to slide, specifically towards the direction of the larger load. This increases the area of ​​the channel with the larger load on the left and right sides, while decreasing the area of ​​the other channel. This continues until the valve core 445 stabilizes at a new equilibrium position. The gas supplied to the two oil outlets 443 will then be redistributed proportionally.

[0089] The spring 446 provides elastic force to the valve core 445. In addition, two connecting grooves 447 are opened on the valve core 445 to allow the transformer oil to flow in the part of the valve body 441 where the spring 446 is installed.

[0090] It should be noted that oil-immersed transformers typically have radiators on both sides, therefore... Figure 1 As shown, a stepped heat dissipation system 300 and a heat diversion mechanism 400 with the same structure can be installed on the other side of this device.

[0091] 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.

[0092] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A transformer with partitioned heat dissipation function, comprising an oil tank (100) and a cascaded heat dissipation system (300), characterized in that: The oil tank (100) stores transformer oil. The inner cavity of the oil tank (100) is divided into oil chamber A (120), oil chamber B (130) and oil chamber C (140) by two heat insulation plates (110). Each of the oil chamber A (120), oil chamber B (130) and oil chamber C (140) is equipped with a transformer body (200) to form a three-phase transformer group. The tiered heat dissipation system (300) includes an A-phase radiator (310), a B-phase radiator (320), and a C-phase radiator (330) with progressively higher heat dissipation levels. The A-phase radiator (310) includes an A-phase heat sink (311), and the input end of the A-phase heat sink (311) is connected to the oil chamber A (120) through an A-phase oil inlet pipe (312). The B-phase radiator (320) includes a B-phase heat sink (321). The input end of the B-phase heat sink (321) is connected to the oil chamber B (130) through the B-phase oil inlet pipe (322). The output end of the A-phase heat sink (311) is connected to the B-phase oil inlet pipe (322) through the A-phase oil outlet pipe (313). The C-phase radiator (330) includes a C-phase heat sink (331). The input end of the C-phase heat sink (331) is connected to the oil chamber C (140) through the C-phase oil inlet pipe (332). The output end of the B-phase heat sink (321) is connected to the C-phase oil inlet pipe (332) through the B-phase oil outlet pipe (323). The output end of the C-phase heat sink (331) is connected to the oil chamber A (120), the oil chamber B (130), and the oil chamber C (140) through the C-phase oil outlet pipe (333).

2. A transformer with partitioned heat dissipation function according to claim 1, characterized in that: Temperature sensors (150) are installed in oil chamber A (120), oil chamber B (130) and oil chamber C (140) to monitor oil temperature. Fans (360) are installed on phase A radiator (310), phase B radiator (320) and phase C radiator (330). The C-phase oil outlet pipe (333) is connected to the oil chamber A (120) through the A-phase cold oil pipe (316), the C-phase oil outlet pipe (333) is connected to the oil chamber B (130) through the B-phase cold oil pipe (326), and the C-phase oil outlet pipe (333) is connected to the oil chamber C (140) through the C-phase cold oil pipe (336).

3. A transformer with partitioned heat dissipation function according to claim 1, characterized in that: The oil temperature in the A-phase oil outlet pipe (313) is lower than the oil temperature in the B-phase oil inlet pipe (322), which serves to pre-cool the transformer oil output from the oil chamber B (130). The oil temperature in the B-phase oil outlet pipe (323) is lower than the oil temperature in the C-phase oil inlet pipe (332), which serves to pre-cool the transformer oil output from the oil chamber C (140).

4. A transformer with partitioned heat dissipation function according to claim 1, characterized in that: The tiered heat dissipation system (300) also includes an AB mutual aid valve assembly (340), which provides supplementary heat dissipation to the oil chamber B (130) when the oil temperature in the oil chamber B (130) exceeds a set threshold. The AB mutual aid valve assembly (340) includes an AB mutual aid pipe (341), and the A-phase oil outlet pipe (313) is connected to the oil chamber B (130) through the AB mutual aid pipe (341), thereby diverting the transformer oil cooled by the A-phase radiator (310) into the oil chamber B (130).

5. A transformer with partitioned heat dissipation function according to claim 1, characterized in that: The tiered heat dissipation system (300) also includes a BC mutual aid valve assembly (350), which provides supplemental heat dissipation to the oil chamber C (140) when the oil temperature in the oil chamber C (140) exceeds a set threshold. The BC mutual aid valve assembly (350) includes a BC mutual aid pipe (351), and the B phase oil outlet pipe (323) is connected to the oil chamber C (140) through the BC mutual aid pipe (351), thereby diverting the transformer oil cooled by the B phase radiator (320) into the oil chamber C (140).

6. A transformer with partitioned heat dissipation function according to claim 1, characterized in that: The oil tank (100) is also provided with a diversion mechanism (400). The A-phase oil inlet pipe (312) is connected to the diversion mechanism (400) through the A-phase diversion pipe (318). The B-phase oil inlet pipe (322) is connected to the diversion mechanism (400) through the B-phase diversion pipe (328). The C-phase oil inlet pipe (332) is connected to the diversion mechanism (400) through the C-phase diversion pipe (338). When the transformer oil cooled by the A-phase radiator (310) is diverted into the oil chamber B (130), the transformer oil in the B-phase oil inlet pipe (322) is diverted into the A-phase oil inlet pipe (312) and the C-phase oil inlet pipe (332) through the diversion mechanism (400); When the transformer oil cooled by the B-phase radiator (320) is diverted into the oil chamber C (140), the transformer oil in the C-phase oil inlet pipe (332) is diverted into the A-phase oil inlet pipe (312) and the B-phase oil inlet pipe (322) through the diversion mechanism (400).

7. A transformer with partitioned heat dissipation function according to claim 6, characterized in that: The diversion mechanism (400) includes a mounting base (410) disposed on the oil tank (100), a turntable (420) rotatably disposed on the mounting base (410), and a one-way valve (430) disposed on the turntable (420). The mounting base (410) is provided with a first connecting hole (411), a second connecting hole (412) and a third connecting hole (413) in a counterclockwise direction. The first connecting hole (411), the second connecting hole (412) and the third connecting hole (413) are equidistant in the circumferential direction. The first connecting hole (411) is connected to the A-phase drainage pipe (318), the second connecting hole (412) is connected to the B-phase drainage pipe (328), and the third connecting hole (413) is connected to the C-phase drainage pipe (338). The turntable (420) has a fourth connecting hole (421), a fifth connecting hole (422) and a sixth connecting hole (423) arranged in a counterclockwise direction. The fourth connecting hole (421), the fifth connecting hole (422) and the sixth connecting hole (423) are equidistant in the circumferential direction.

8. A transformer with partitioned heat dissipation function according to claim 7, characterized in that: The input end of the one-way valve (430) is connected to the fourth connecting hole (421). A proportional valve assembly (440) is provided on the turntable (420). The proportional valve assembly (440) is connected to the output end of the one-way valve (430). The fifth connecting hole (422) and the sixth connecting hole (423) are both connected to the proportional valve assembly (440).

9. A transformer with partitioned heat dissipation function according to claim 7, characterized in that: The drainage mechanism (400) further includes a rotating assembly (450), which includes a motor (451) mounted on the mounting base (410). A first gear (452) is mounted on the output shaft of the motor (451), and a second gear (453) is mounted on the turntable (420). The second gear (453) meshes with the first gear (452).

10. A transformer with partitioned heat dissipation function according to claim 8, characterized in that: The proportional valve assembly (440) includes a valve body (441) disposed on the mounting base (410), and an oil inlet groove (442) is provided at one end of the valve body (441), which is connected to the output end of the one-way valve (430). Two oil outlet grooves (443) are provided at the other end of the valve body (441), and two throttling holes (444) are provided inside the valve body (441). The oil inlet groove (442) is connected to the two oil outlet grooves (443) through the two throttling holes (444) respectively. A valve core (445) is slidably arranged inside the valve body (441). The two ends of the valve core (445) are elastically connected to the inner walls of both sides of the valve body (441) through two springs (446) respectively.

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