A dry-type transformer for dual-split photovoltaic power generation

Abstract

The present invention relates to the technical field of transformers, and specifically relates to a dry-type transformer for dual-split photovoltaic power generation, including a basic component, the basic component includes a three-phase column-type iron core, and coil windings sleeved on each phase column; the forced air-cooling component includes a main air duct provided on one side of the lower clamp, both sides on one side of the main air duct are provided with blowers, and the air outlet ends of the blowers are communicated with the inside of the main air duct; the forced air-cooling component further includes three sealing air guiding structures at the lower, middle, and upper positions. By the forced air-cooling component, a fast air flow is effectively formed in the annular gap. According to Bernoulli's principle, in cooperation with a Laffal nozzle and a variable-diameter bellows, the hot air accumulated in the sound insulation cover is discharged, improving the heat dissipation efficiency, thereby ensuring the suitability of the ambient temperature when the transformer is working. The annular gap is exposed through the high-temperature linkage component, winning time for the emergency repair by the staff and improving safety.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and particularly to a dry-type transformer for double-split photovoltaic power generation. Background Art

[0002] A split-winding transformer refers to a multi-winding power transformer in which each phase consists of a high-voltage winding and two or more low-voltage windings with the same voltage and capacity. The normal power transmission of the split transformer only occurs between the high- and low-voltage windings, and it has the function of limiting short-circuit current during a fault; at the same time, several branches in the split-winding transformer have the same capacity and equal or close rated voltages, and can operate independently or in parallel, and can carry the same or different loads; when a fault occurs in the load or power supply connected to a certain low-voltage winding, the remaining low-voltage windings can still operate normally; moreover, since there is no electrical connection between the split windings, the magnetic coupling is relatively weak, there is a large impedance between the split branches, and the impedance between the split path and the non-split winding should be the same.

[0003] Moreover, dry-type transformers are widely used in places such as local lighting, high-rise buildings, airports, docks, CNC machinery equipment, etc. Simply put, a dry-type transformer refers to a transformer in which the iron core and windings are not impregnated in insulating oil; the cooling methods of dry-type transformers are divided into natural air cooling and forced air cooling. In natural air cooling, the transformer can operate continuously at rated capacity for a long time; in forced air cooling, the output capacity of the transformer can be increased by a certain proportion. Therefore, forced air cooling is suitable for intermittent overload operation or emergency accident overload operation. At the same time, when overloaded by forced air cooling, the load loss and impedance voltage increase significantly, so it is not suitable for long-term continuous overload operation.

[0004] With the wide popularization and application of photovoltaic power generation panels, due to the large power generation and numerous battery panels in photovoltaic power stations, in order to improve the stability of power transmission, a large number of double-split dry-type transformers are often used in photovoltaic power stations; and because the existing double-split dry-type transformers in the process of use, since the split-winding transformer is a multi-winding power transformer, the internal winding heat dissipation ring gap is narrow, resulting in a large amount of heat often accumulating inside the double-split dry-type transformer, endangering the safety of the transformer during use; and due to the current cooling and heat dissipation methods of dry-type transformers, most only install simple cross-flow fans below, lacking a diversion device, which causes cold air to be unable to effectively enter the ring gap and form a rapid air flow, ultimately resulting in low heat dissipation efficiency, easy overheating, and at the same time will further affect the service life of the transformer.

[0005] Therefore, how to design a double-split dry-type transformer that can improve heat dissipation efficiency is a technical problem that needs to be solved by current technical personnel. Summary of the Invention

[0006] In order to solve the problem that in the existing double - split dry - type transformer, cold air cannot effectively enter the annular gap and form a rapid air flow, ultimately resulting in low heat dissipation efficiency, the present invention provides a dry - type transformer for double - split photovoltaic power generation to solve the above problems.

[0007] To achieve the above object, the present invention provides a dry - type transformer for double - split photovoltaic power generation, comprising:

[0008] A basic component and a forced - air cooling component; the basic component includes a three - phase column - type iron core, an upper clamp held at the upper yoke of the iron core, a lower clamp held at the lower yoke of the iron core, and a coil winding sleeved on each phase column. Each of the coil windings is split into two separated independent windings up and down. Each of the independent windings includes a low - voltage winding in the inner circle and a high - voltage winding in the outer circle. A plurality of vertical spacers are evenly arranged in the annular gap between the low - voltage winding and the high - voltage winding; the forced - air cooling component includes three sealed air - guiding structures at the lower, middle, and upper parts, a plurality of branch pipes installed at the top of the main air duct, and a main air duct provided on one side of the lower clamp; on both sides of one side of the main air duct, blowers are provided, and the air - outlet ends of the blowers are communicated with the inside of the main air duct. The air - inlet ends of the blowers are connected to air filters, and the outlet ends of the branch pipes point to the coil winding; among them, there are three groups of the lower sealed air - guiding structures, which are respectively provided between the bottom end of the coil winding and the lower clamp.

[0009] Preferably, each group of the lower sealed air - guiding structures includes a lower sealing disc sleeved under the phase column. Four corners of the bottom of the lower sealing disc are threadedly connected with first support bolts, and the bottom ends of the first support bolts respectively abut against the top of the lower clamp. A plurality of first support blocks are evenly installed around the top of the lower sealing disc, and the top parts of the first support blocks respectively abut against the bottom end of the coil winding.

[0010] Preferably, a first surrounding ring is installed around the side of the lower sealing disc. The combination of the lower sealing disc, the first support blocks, the first surrounding ring, and the first support bolts is divided into two parts from the middle and forms a detachable two - piece structure; grooves are formed in the middle of the first support blocks. A first conduit is installed on the outside of one of the first support blocks in each group of the lower sealed air - guiding structures and is communicated with the internal groove. The outer ports of the first conduits are communicated with the main air duct through pipes; there are three groups of the middle sealed air - guiding structures, which are respectively provided between the two independent windings up and down; each group of the middle sealed air - guiding structures includes a plurality of second support blocks evenly surrounding the middle of the iron - core phase column. The top parts of the second support blocks respectively abut against the bottom end of the upper independent winding, and the bottom parts of the second support blocks respectively abut against the top end of the lower independent winding.

[0011] Preferably, grooves two are formed in the middle of each of the second support blocks. One of the second support blocks in each set of the middle of the seal air guiding structure is externally provided with a second conduit, which is communicated with the internal groove two thereof. The outer ports of the second conduits are all connected with a first auxiliary air duct, and the outer ports of the first auxiliary air ducts are all connected with a first Laval nozzle; Each set of the middle of the seal air guiding structure further includes a second collar sleeved between the upper and lower independent windings, and a plurality of first sliding strips slidably engaged with the inner circumference of the second collar. The first sliding strips are respectively installed at the top sides of the lower high-voltage windings. An opening one for accommodating the second conduit is formed in the second collar; There are three sets of the upper seal air guiding structures, which are respectively arranged between the top end of the coil winding and the upper clamping member; Each set of the upper seal air guiding structures includes an upper sealing disc sleeved above the iron core phase column. Four corners of the top of the upper sealing disc are all threadedly connected with second support bolts, and the top ends of the second support bolts respectively abut against the bottom of the upper clamping member. A plurality of third support blocks are evenly installed around the bottom of the upper sealing disc, and the bottoms of the third support blocks respectively abut against the top end of the coil winding. The combination of the upper sealing disc and the third support blocks is divided into two parts from the middle and forms a detachable two-piece structure.

[0012] Preferably, it further includes a high-temperature linkage assembly. The high-temperature linkage assembly includes gears rotatably connected to the sides of each upper high-voltage winding; Grooves three are formed in the middle of each of the third support blocks. One of the third support blocks in each set of the upper seal air guiding structures is externally provided with a third conduit, which is communicated with the internal groove three thereof. The outer ports of the first conduits are all connected with a second auxiliary air duct, and the outer ports of the second auxiliary air ducts are all connected with a second Laval nozzle; Each set of the upper seal air guiding structures further includes a third collar sleeved outside the upper sealing disc, and a plurality of second sliding strips slidably engaged with the inner circumference of the third collar. The second sliding strips are respectively installed at the top sides of the upper high-voltage windings. An opening two for accommodating the third conduit is formed in the third collar; One side of each gear is meshed with a second rack, the top end of the second rack is correspondingly connected with the third collar, and the bottom end of the second rack is correspondingly connected with the second collar.

[0013] Preferably, the other side of each gear is meshed with a first rack. A support arm is installed in the middle of one side of the first rack. One end of the support arm is connected with a piston rod, and the bottom end of the piston rod is installed with a piston ring. The outside of the piston ring is all fitted with a cylinder block. The cylinder blocks are respectively installed on the sides of the upper high-voltage windings. Slots are formed in the upper part of the pipe wall of the cylinder block along the axial direction thereof. The support arms are respectively fitted in the slots. End covers are installed at the upper and lower ports of the cylinder block; The lower end cover is installed with a connecting pipe. One end of the connecting pipe is communicated with the inside of the cylinder block, and the other end of the connecting pipe is connected with a heat receiving bottle. The heat receiving bottles are respectively arranged inside the second conduits; The inside of the heat receiving bottle is filled with a liquid that is easy to expand when heated.

[0014] Preferably, a sound insulation and heat dissipation component is further included. Bases are provided on both sides of the bottom of the lower clamping member. The sound insulation and heat dissipation component includes an upper cover plate provided on the top of the upper clamping member, a lower cover plate provided between the lower clamping member and the bases, side cover plates provided on both sides, and edge cover plates provided on both sides. Among them, sound insulation felts are installed on the inner sides of the upper cover plate, the lower cover plate, the side cover plates, and the edge cover plates. The top parts of the side cover plates are respectively connected to both sides of the upper cover plate, the bottom parts of the side cover plates are respectively connected to both sides of the lower cover plate, the top parts of the edge cover plates are respectively connected to both sides of the upper cover plate, the bottom parts of the edge cover plates are respectively connected to both sides of the lower cover plate, and the contact edges between the adjacent side cover plates and the edge cover plates are connected to each other.

[0015] Preferably, the sound insulation and heat dissipation component further includes lower reduced-diameter horn tubes corresponding to the positions of the respective coil windings and installed in the middle of one side cover plate. The large-diameter ends of the lower reduced-diameter horn tubes extend towards the corresponding coil windings, the small-diameter ends of the lower reduced-diameter horn tubes penetrate through the side cover plates correspondingly, and the first Laval nozzles are respectively installed at the small-diameter parts inside the lower reduced-diameter horn tubes. The sound insulation and heat dissipation component further includes upper reduced-diameter horn tubes corresponding to the positions of the respective coil windings and installed above one side cover plate. The large-diameter ends of the upper reduced-diameter horn tubes extend towards the corresponding coil windings, the small-diameter ends of the upper reduced-diameter horn tubes penetrate through the side cover plates correspondingly, and the second Laval nozzles are respectively installed at the small-diameter parts inside the upper reduced-diameter horn tubes.

[0016] Preferably, the basic component further includes a lifting ring installed on the top of the upper clamping member, and the top of the lifting ring penetrates through the upper cover plate correspondingly. The basic component further includes a low-voltage output terminal and a high-voltage output terminal corresponding to the positions of the respective coil windings and installed above one side of the upper clamping member. Each low-voltage output terminal is electrically connected to the low-voltage winding correspondingly, each high-voltage output terminal is electrically connected to the high-voltage winding correspondingly, and both the low-voltage output terminal and the high-voltage output terminal are arranged above the upper cover plate.

[0017] Preferably, the sound insulation and heat dissipation component further includes an upper rubber shock pad and a lower rubber shock pad. The upper rubber shock pad is arranged between the upper cover plate and the upper clamping member, the lower rubber shock pad is arranged between the lower cover plate and the lower clamping member, and the bases are correspondingly installed on both sides of the bottom of the lower cover plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. In the present invention, after purifying the external air, it is introduced into the annular gap of the coil winding. At this time, the cold air will flow rapidly upward under pressure, thereby taking away the heat in the annular gap. When the air flow passes through the interval at the splitting point, part of the air flow will, under the action of pressure, be discharged outward through the second conduit, the first auxiliary air duct, and the first Laval nozzle. Then the remaining air flow will continue to rise and be discharged through the third conduit, the second auxiliary air duct, and the second Laval nozzle. By using the first Laval nozzle and the second Laval nozzle, together with the air pressure, the flow rate of the air flow is increased, and the efficiency of heat dissipation and cooling is improved, avoiding the problem in the prior art that only a fan is simply used, resulting in the inability to effectively form a rapid air flow in the annular gap of the coil winding, and ultimately leading to poor heat dissipation efficiency.

[0020] 2. When the forced air cooling component fails to work properly, the present invention monitors that the temperature in the annular gap rises abnormally through the temperature sensor and alarms the control center. At this time, since the second conduit is connected to the annular gap, its internal temperature will also rise. When the heat receiving bottle is heated, the substance filled inside it will expand due to heat and pour into the cylinder body, pushing the piston ring to move. Then the piston rod will drive the first rack to move. Through the transmission of the gear, finally, the second and third rings will slide down through the second rack, so that the annular gap is exposed, achieving the purpose of natural heat dissipation and cooling, winning time for the repair by the staff, and improving the safety of use.

[0021] 3. To improve the convenience and applicability of use, the equipment uses the sound insulation cover in the sound insulation and heat dissipation component to reduce the propagation intensity of noise. When using the sound insulation and heat dissipation component, inevitably, its internal temperature will rise due to aggregation. Through the cooperation between the first Laval nozzle and the lower reduced-diameter horn pipe, and between the second Laval nozzle and the upper reduced-diameter horn pipe, when the hot air is ejected from the first Laval nozzle and the second Laval nozzle, according to Bernoulli's principle, the pressure will be lower where the flow rate is larger. Thus, a low-pressure environment will be formed at the small-diameter end of the lower reduced-diameter horn pipe and the upper reduced-diameter horn pipe. Through the pressure difference, the hot air aggregated inside the sound insulation and heat dissipation component will be "sucked out" of the inside of the sound insulation and heat dissipation component, ensuring the suitability of the ambient temperature during the operation of the transformer. In addition, this design also has the advantages of simple structure and low cost investment. Description of the Drawings

[0022] Figure 1 It is a schematic assembly diagram of the forced air cooling component and the high-temperature linkage component of the present invention.

[0023] Figure 2 It is a schematic diagram of the basic component structure of the present invention.

[0024] Figure 3 For Figure 1 Another perspective schematic diagram of the structure in

[0025] Figure 4Schematic diagram of the forced air cooling component of the present invention in cooperation with the iron core.

[0026] Figure 5 For Figure 4 Schematic diagram of another perspective of the structure in

[0027] Figure 6 Schematic diagram of the lower sealing air guiding structure in the embodiment of the present invention.

[0028] Figure 7 Schematic diagram of the middle sealing air guiding structure in the embodiment of the present invention.

[0029] Figure 8 Schematic diagram of the upper sealing air guiding structure in the embodiment of the present invention.

[0030] Figure 9 Schematic diagram of the assembly of the high-temperature linkage component of the present invention.

[0031] Figure 10 Schematic diagram of the structure of the high-temperature linkage component of the present invention.

[0032] Figure 11 Schematic diagram of the disassembly of the internal structure of the cylinder block of the present invention.

[0033] Figure 12 Schematic diagram of the sound insulation and heat dissipation component of the present invention.

[0034] Figure 13 For Figure 12 Schematic diagram of another perspective of the structure in

[0035] Figure 14 Schematic diagram of the internal structure of the sound insulation and heat dissipation component of the present invention.

[0036] Figure 15 Schematic diagram of the assembly of the first Laval nozzle and the second Laval nozzle of the present invention.

[0037] Among them, 1. Basic components; 101. Iron core; 102. Coil winding; 103. Spacer; 104. Upper clamping piece; 105. Lower clamping piece; 106. Base; 107. Lifting ring; 108. Low-voltage outgoing terminal; 109. High-voltage outgoing terminal; 2. Forced air cooling components; 201. Main air duct; 202. Blower; 203. Air filter; 204. Branch pipe; 205. Lower sealing disc; 206. Support block 1; 207. Duct 1; 208. Ring 1; 209. Support bolt 1; 210. Support block 2; 211. Duct 2; 212. Auxiliary air duct 1; 213. Laval nozzle 1; 214. Ring 2; 215. Slide bar 1; 216. Upper sealing disc; 217. Support block 3; 218. Duct 3; 219. Auxiliary air duct 2; 220. Laval nozzle 2; 221. Ring 3; 222. Slide bar 2; 223. Support bolt 2; 3. High-temperature linkage components; 301. Cylinder block; 302. End cover; 303. Piston ring; 304. Piston rod; 305. Heat-receiving bottle; 306. Groove; 307. Support arm; 308. Rack 1; 309. Gear; 310. Rack 2; 4. Sound insulation and heat dissipation components; 401. Upper cover plate; 402. Lower cover plate; 403. Side cover plate; 404. Edge cover plate; 405. Upper rubber shock pad; 406. Lower rubber shock pad; 407. Lower reduced-diameter horn pipe; 408. Upper reduced-diameter horn pipe. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment:

[0040] As Figures 1-15 shown, the embodiment of the present invention provides a dry-type transformer for dual-split photovoltaic power generation. Specifically, refer to Figure 2, which includes a basic component 1. The basic component 1 includes a three-phase columnar iron core 101, and coil windings 102 sleeved on each phase column. The coil windings 102 are all split into two separated independent windings, upper and lower. Each independent winding includes a low-voltage winding in the inner circle and a high-voltage winding in the outer circle. A plurality of vertical spacer bars 103 are evenly arranged in the annular gap between the low-voltage winding and the high-voltage winding. In the actual use process, the above-mentioned annular gap is used as a heat dissipation channel. At the same time, in order to ensure the stable operation of the heat dissipation mechanism, a temperature sensor is usually arranged in this annular gap. The basic component 1 also includes an upper clamping piece 104 clamped at the upper yoke of the iron core 101, and a lower clamping piece 105 clamped at the lower yoke of the iron core 101. Both sides of the bottom of the lower clamping piece 105 are provided with bases 106. The above structure belongs to the most basic and common structure of a double-split transformer, and the specific connection technical means are not elaborated here.

[0041] Specifically, it further includes a forced air cooling component 2.

[0042] In this embodiment, referring to Figure 1 , the forced air cooling component 2 includes a main air duct 201 provided on one side of the lower clamping piece 105. Both sides of one side of the main air duct 201 are provided with blowers 202, and the air outlet ends of the blowers 202 are communicated with the inside of the main air duct 201, which is used to direct external cold air to the coil winding 102.

[0043] The forced air cooling component 2 further includes lower, middle and upper sealing air guiding structures, which are used to make the introduced cold air flow rapidly in the annular gap of the coil winding 102 better, so as to improve the cooling efficiency.

[0044] Among them, there are three groups of lower sealing air guiding structures, which are respectively arranged between the bottom end of the coil winding 102 and the lower clamping piece 105, and are used to introduce external cold air into the annular gap.

[0045] In this embodiment, referring to Figures 3-6 , each group of lower sealing air guiding structures includes a lower sealing disk 205 sleeved under the phase column. Four corners of the bottom of the lower sealing disk 205 are threadedly connected with support bolts 209. The bottom ends of the support bolts 209 respectively abut against the top of the lower clamping piece 105. A plurality of support blocks 206 are evenly installed around the top of the lower sealing disk 205. The top ends of the support blocks 206 respectively abut against the bottom end of the coil winding 102, which is used to keep the coil winding 102 from sinking.

[0046] A surrounding ring 208 is installed around the side of the lower sealing disk 205. The combination of the lower sealing disk 205, the support blocks 206, the surrounding ring 208 and the support bolts 209 is split into two from the middle and forms a detachable two-piece structure, which is convenient for installation and maintenance. Among them, the surrounding ring 208 is used to block the bottom end of the coil winding 102 to prevent cold air from leaking when it is introduced into the annular gap.

[0047] A groove is provided in the middle of each of the first supporting blocks 206 to facilitate the diversion of cold air. A first conduit 207 is installed on the outside of each of the first supporting blocks 206 in each of the lower sealing air guiding structures, and is communicated with the internal groove. The outer ports of the first conduits 207 are communicated with the main air duct 201 through pipes.

[0048] In this embodiment, referring to Figures 3-5 , there are three groups of middle sealing air guiding structures, which are respectively arranged between the upper and lower independent windings.

[0049] Specifically referring to Figure 7 , each group of middle sealing air guiding structures includes a plurality of second supporting blocks 210 evenly arranged around the middle of the core 101 phase column. The tops of the second supporting blocks 210 respectively abut against the bottom ends of the upper independent windings, and the bottoms of the second supporting blocks 210 respectively abut against the top ends of the lower independent windings, serving as supports for the upper and lower independent windings. On the one hand, the stability of the coil winding 102 is maintained to achieve a double-split effect, and on the other hand, the gaps left can also improve the heat dissipation efficiency.

[0050] Furthermore, a groove is provided in the middle of each of the second supporting blocks 210 to facilitate the diversion and flow of air. A second conduit 211 is installed on the outside of each of the second supporting blocks 210 in each group of middle sealing air guiding structures, and is communicated with the internal groove. The outer ports of the second conduits 211 are connected to a first auxiliary air duct 212, and the outer ports of the first auxiliary air ducts 212 are connected to a first Laval nozzle 213. When cold air is injected into the annular gap, a high-pressure environment will be formed inside, so as to extrude the hot air out of the annular gap, and the above structure is to lead out part of the hot air to ensure the heat dissipation efficiency.

[0051] Furthermore, each group of middle sealing air guiding structures also includes a second ring 214 sleeved between the upper and lower independent windings, and a plurality of first sliding strips 215 slidably fitted inside the second ring 214 for one week. The first sliding strips 215 are respectively installed on the side tops of the lower high-voltage windings to prevent high-pressure air leakage, thereby reducing the pressure in the annular gap and being unfavorable for the dissipation of internal hot air. An opening is provided on the second ring 214 for accommodating the second conduit 211.

[0052] In this embodiment, referring to Figures 3-5 , there are three groups of upper sealing air guiding structures, which are respectively arranged between the top of the coil winding 102 and the upper clamping piece 104.

[0053] Specifically, referring to Figure 8, each upper sealing air guiding structure includes an upper sealing disc 216 sleeved above the phase column of the iron core 101. At the four corners of the top of the upper sealing disc 216, second support bolts 223 are threadedly connected. The tops of the second support bolts 223 respectively abut against the bottom of the upper clamping piece 104. A plurality of third support blocks 217 are evenly installed around the bottom of the upper sealing disc 216. The bottoms of the third support blocks 217 respectively abut against the top of the coil winding 102. The combination of the upper sealing disc 216 and the third support blocks 217 is divided into two parts from the middle and forms a detachable two-piece structure, which is used to support the top of the coil winding 102. After cooperating with the first support bolt 209 below, the coil winding 102 can be firmly fixed on the iron core 101 to avoid shaking.

[0054] Further, grooves three are respectively formed in the middle of the third support blocks 217, which is also convenient for the diversion and flow of air. A third conduit 218 is installed on the outside of one of the third support blocks 217 in each upper sealing air guiding structure and is communicated with the internal groove three. The outer ports of the first conduits 207 are respectively connected with second auxiliary air ducts 219. The outer ports of the second auxiliary air ducts 219 are respectively connected with second Laval nozzles 220. Similarly, when cold air is injected into the annular gap, a high-pressure environment will be formed inside, so as to extrude the hot air out of the annular gap. And the above structure is to discharge the remaining part of the hot air to ensure the heat dissipation efficiency.

[0055] Further, each upper sealing air guiding structure also includes a third collar 221 sleeved outside the upper sealing disc 216, and a plurality of second sliding strips 222 slidably fitted inside the third collar 221 in a circle. The second sliding strips 222 are respectively installed at the top of the side of the upper high-voltage winding above. An opening two for accommodating the third conduit 218 is formed in the third collar 221 to avoid the emission of high-pressure gas, ensure the flow rate, and stabilize the heat dissipation efficiency.

[0056] In this embodiment, referring to Figures 9-11 , it further includes a high-temperature linkage component 3. The high-temperature linkage component 3 includes a gear 309 rotatably connected to the side of each upper high-voltage winding above. A second rack 310 is meshed and connected to one side of the gear 309. The top of the second rack 310 is correspondingly connected to the third collar 221, and the bottom of the second rack 310 is correspondingly connected to the second collar 214.

[0057] A first rack 308 is meshed and connected to the other side of the gear 309. An arm 307 is installed in the middle of one side of the first rack 308. A piston rod 304 is connected to one end of the arm 307. A piston ring 303 is installed at the bottom of the piston rod 304. The piston ring 303 is externally fitted with a cylinder block 301. The cylinder blocks 301 are respectively installed on the side of the upper high-voltage winding above. A slot 306 is formed in the upper part of the pipe wall of the cylinder block 301 along its axial direction. The arms 307 are respectively fitted inside the slot 306. End covers 302 are installed at the upper and lower ports of the cylinder block 301.

[0058] A connecting pipe is installed on the lower end cover 302. One end of the connecting pipe communicates with the inside of the cylinder block 301, and the other end of the connecting pipe is connected to a heat-receiving bottle 305. The heat-receiving bottles 305 are respectively arranged inside the second conduit 211.

[0059] The inside of the heat-receiving bottle 305 is filled with a liquid that is easy to expand when heated, including but not limited to kerosene and mercury.

[0060] In this embodiment, when the forced air-cooling assembly 2 fails to work properly, the temperature sensor monitors that the temperature in the annular gap rises abnormally. At this time, since the inside of the second conduit 211 communicates with the annular gap, its internal temperature will also rise. When the heat-receiving bottle 305 is heated, the substance filled inside it will expand when heated, and thus will flow into the cylinder block 301 and push the piston ring 303 to move. Furthermore, the piston rod 304 will drive the first rack 308 to move. Through the transmission of the gear 309, finally, through the second rack 310, the second collar 214 and the third collar 221 slide down, so that the annular gap is exposed, achieving the purpose of natural heat dissipation and temperature reduction, and improving the safety of use.

[0061] In this embodiment, referring to Figures 12-15 , it further includes a sound insulation and heat dissipation assembly 4. The sound insulation and heat dissipation assembly 4 includes an upper cover plate 401 arranged on the top of the upper clamping member 104, a lower cover plate 402 arranged between the lower clamping member 105 and the base 106, side cover plates 403 arranged on both sides, and edge cover plates 404 arranged on both sides.

[0062] Among them, sound insulation felts are installed on the inner sides of the upper cover plate 401, the lower cover plate 402, the side cover plates 403, and the edge cover plates 404. The top parts of the side cover plates 403 are respectively connected to both sides of the upper cover plate 401, the bottom parts of the side cover plates 403 are respectively connected to both sides of the lower cover plate 402, the top parts of the edge cover plates 404 are respectively connected to both sides of the upper cover plate 401, and the bottom parts of the edge cover plates 404 are respectively connected to both sides of the lower cover plate 402. The contact edges between adjacent side cover plates 403 and edge cover plates 404 are connected to each other.

[0063] In this embodiment, through the sound insulation and heat dissipation assembly 4, when the transformer is in use, the propagation of noise is reduced to the greatest extent, the applicability is improved, and at the same time, it can also play a certain protective role.

[0064] Furthermore, the sound insulation and heat dissipation assembly 4 further includes lower reduced-diameter trumpet tubes 407 corresponding to the positions of the respective coil windings 102 and installed in the middle of one side cover plate 403. The large-diameter ends of the lower reduced-diameter trumpet tubes 407 extend towards the corresponding coil windings 102, and the small-diameter ends of the lower reduced-diameter trumpet tubes 407 penetrate through the side cover plates 403 correspondingly. The first Laval nozzles 213 are respectively installed at the small-diameter parts inside the lower reduced-diameter trumpet tubes 407.

[0065] The sound insulation and heat dissipation component 4 further includes upper reduced-diameter trumpet tubes 408 corresponding to the positions of the respective coil windings 102 and installed above one side cover plate 403. The large-diameter end of the upper reduced-diameter trumpet tube 408 extends towards the corresponding coil winding 102, and the small-diameter end of the upper reduced-diameter trumpet tube 408 correspondingly penetrates through the side cover plate 403. The second Laval nozzles 220 are respectively installed at the small-diameter positions inside the upper reduced-diameter trumpet tubes 408.

[0066] In this embodiment, when the sound insulation and heat dissipation component 4 is used, inevitably, the internal temperature will rise due to aggregation. Through the cooperation between the first Laval nozzle 213 and the lower reduced-diameter trumpet tube 407, and between the second Laval nozzle 220 and the upper reduced-diameter trumpet tube 408, when the first Laval nozzle 213 and the second Laval nozzle 220 eject hot air, according to Bernoulli's principle, the pressure will be lower where the flow rate is larger. Thus, a low-pressure environment will be formed at the small-diameter ends of the lower reduced-diameter trumpet tube 407 and the upper reduced-diameter trumpet tube 408. Through the pressure difference, the hot air accumulated inside the sound insulation and heat dissipation component 4 will be "sucked out" of the interior of the sound insulation and heat dissipation component 4, thereby ensuring a suitable ambient temperature during the operation of the transformer.

[0067] Furthermore, the basic component 1 further includes a lifting ring 107 installed on the top of the upper clamping piece 104, and the top of the lifting ring 107 correspondingly penetrates through the upper cover plate 401. It also includes low-voltage output terminals 108 corresponding to the positions of the respective coil windings 102 and installed above one side of the upper clamping piece 104. Each low-voltage output terminal 108 is correspondingly electrically connected to the low-voltage winding and is arranged above the upper cover plate 401. It further includes high-voltage output terminals 109 corresponding to the positions of the respective coil windings 102 and installed above the other side of the upper clamping piece 104. Each high-voltage output terminal 109 is correspondingly electrically connected to the high-voltage winding and is arranged above the upper cover plate 401.

[0068] In this embodiment, the technical means of the electrical connection between the low-voltage output terminals 108, the high-voltage output terminals 109 and the coil windings 102 are common general knowledge in the art, so they will not be elaborated here.

[0069] Furthermore, the forced air cooling component 2 further includes an air filter 203 connected to the air inlet end of the blower 202, and the air filter 203 is arranged outside the side cover plate 403. It also includes a plurality of branch pipes 204 installed on the top of the main air duct 201, and the outlet ends of the branch pipes 204 point to the coil windings 102 for the purpose of cooling and dissipating heat from the outer surfaces of the coil windings 102.

[0070] Furthermore, the sound insulation and heat dissipation component 4 further includes an upper rubber shock pad 405 disposed between the upper cover plate 401 and the upper clamping member 104, and a lower rubber shock pad 406 disposed between the lower cover plate 402 and the lower clamping member 105. The base 106 is correspondingly installed at both sides of the bottom of the lower cover plate 402. Through the design of shock pads, the propagation of noise can be further suppressed, which is beneficial to improving the noise reduction level of the equipment.

[0071] When this solution is in operation, the blower 202 operates to purify the outside air through the air filter 203 and introduce it into the main air duct 201. Then, through the diversion of the first conduit 207, the cold air enters the annular gap of the coil winding 102. At this time, the cold air will flow rapidly upward under pressure, thereby taking away the heat in the annular gap. When the air flow passes through the interval at the splitting point, part of the air flow will enter the second conduit 211 through the second groove under the action of pressure, and then be discharged outward through the first auxiliary air duct 212 and the first Laval nozzle 213. Then, the remaining air flow will continue to rise and enter the third conduit 218 under the guidance of the third groove, and then be discharged through the second auxiliary air duct 219 and the second Laval nozzle 220. By using the first Laval nozzle 213 and the second Laval nozzle 220, combined with the air pressure, the flow velocity of the air flow is increased, and the efficiency of heat dissipation and temperature reduction is improved. This avoids the problem in the prior art that only a fan is simply used, resulting in the inability to effectively form a rapid air flow in the annular gap of the coil winding 102, and ultimately leading to poor heat dissipation efficiency. Further, when the forced air cooling component 2 fails to work properly, the temperature sensor monitors that the temperature in the annular gap rises abnormally and alarms the control center. At the same time, since the second conduit 211 is connected to the annular gap, its internal temperature will also rise. When the heat receiving bottle 305 is heated, the substance filled inside it will expand due to heat, and thus rush into the cylinder block 301 and push the piston ring 303 to move. Then, the piston rod 304 will drive the first rack 308 to move. Through the transmission of the gear 309, finally, the second rack 310 causes the second collar 214 and the third collar 221 to slide down, so that the annular gap is exposed, achieving the purpose of natural heat dissipation and temperature reduction, winning time for the repair by the staff, and improving the safety of use. Further, in order to improve the convenience and applicability of use, this device will use the sound insulation cover in the sound insulation and heat dissipation component 4 to reduce the propagation intensity of noise. When the sound insulation and heat dissipation component 4 is used, inevitably, its internal temperature will rise due to aggregation. Through the cooperation between the first Laval nozzle 213 and the lower reduced-diameter horn 407, and between the second Laval nozzle 220 and the upper reduced-diameter horn 408, when the first Laval nozzle 213 and the second Laval nozzle 220 spray hot air, according to Bernoulli's principle, the pressure will be lower where the flow velocity is greater. Thus, a low-pressure environment will be formed at the small-diameter ends of the lower reduced-diameter horn 407 and the upper reduced-diameter horn 408. Through the pressure difference, the hot air aggregated inside the sound insulation and heat dissipation component 4 will be "sucked out" of the inside of the sound insulation and heat dissipation component 4, thereby ensuring a suitable ambient temperature during the operation of the transformer.

[0072] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry-type transformer for double-split photovoltaic power generation, characterized in that: include: A base assembly (1) and a forced air cooling assembly (2); The basic assembly comprises a three-phase column-type iron core (101), an upper clamp (104) clamped at an upper yoke of the iron core (101), and a lower clamp (105) clamped at a lower yoke of the iron core (101), and a coil winding (102) sleeved on each phase column, each of the coil windings (102) being split into two upper and lower independent windings spaced apart, each of the independent windings comprising a low-voltage winding in an inner circle and a high-voltage winding in an outer circle, and a plurality of vertical struts (103) being evenly arranged in an annular gap between the low-voltage winding and the high-voltage winding; The forced air cooling component (2) comprises three sealed air guide structures at the bottom, middle and top, and a plurality of branch pipes (204) installed at the top of the main air duct (201), and the main air duct (201) is arranged on one side of the lower clamp (105); blowers (202) are arranged on both sides of one side of the main air duct (201), and the air outlet ends of the blowers (202) are connected to the inside of the main air duct (201), the air inlet end of the blower (202) is connected to an air filter (203), and the outlet ends of the branch pipes (204) point to the coil winding (102); wherein, there are three groups of the sealed air guide structures at the bottom, which are respectively arranged between the bottom end of the coil winding (102) and the lower clamp (105); The sealed air guide structure at the bottom of each group comprises a lower sealing disk (205) sleeved under the phase column, a plurality of support blocks (206) are evenly mounted around the top of the lower sealing disk (205), and the tops of the support blocks (206) respectively contact the bottom ends of the coil windings (102); A groove one is provided in the middle of each support block one (206); a conduit one (207) is installed on the outer side of one of the support blocks one (206) in each group of the sealed air guide structures, and the conduit one (207) is connected to the groove one inside the support block one (206); and the outer port of the conduit one (207) is connected to the main air duct (201) through a pipeline.

2. A dry-type transformer for double-split photovoltaic power generation according to claim 1, characterized in that: The four corners of the bottom of the lower sealing disk (205) are threadedly connected with support bolts one (209), and the bottom ends of the support bolts one (209) respectively contact the top of the lower clamp (105); each group of the sealing air guide structure includes an upper sealing disk (216) sleeved above the phase column of the iron core (101), and a plurality of support blocks three (217) are evenly installed around the bottom of the upper sealing disk (216), and the bottoms of the support blocks three (217) respectively contact the top of the coil winding (102).

3. A dry-type transformer for double-split photovoltaic power generation according to claim 2, characterized in that: A ring (208) is installed around the side of the lower sealing disc (205), and the assembly of the lower sealing disc (205), the supporting block (206), the ring (208) and the supporting bolt (209) is divided into two parts from the middle to form a detachable two-piece structure; There are three groups of the sealed air-guiding structures in the middle, which are respectively arranged between the upper and lower independent windings; each group of the sealed air-guiding structures in the middle includes a plurality of support blocks (210) uniformly surrounding the middle of the phase column of the core (101), and the tops of the support blocks (210) respectively contact the bottom ends of the upper independent windings, and the bottoms of the support blocks (210) respectively contact the top ends of the lower independent windings.

4. A dry-type transformer for double-split photovoltaic power generation according to claim 3, characterized in that: A groove 2 is provided in the middle of each support block 2 (210); a conduit 2 (211) is installed on the outer side of one of the support blocks 2 (210) in each group of the middle sealed air guide structures, and the conduit 2 (211) is connected to the inner groove 2 of the support block 2 (210); the outer port of the conduit 2 (211) is connected to an auxiliary air duct 1 (212), and the outer port of the auxiliary air duct 1 (212) is connected to a Laval nozzle 1 (213); The sealed air guide structure in the middle of each group also includes a second enclosure (214) sleeved between the upper and lower independent windings, and a plurality of first slide bars (215) slidably fitted inside the second enclosure (214) for a circle, the first slide bars (215) being respectively mounted on the top of the side of the lower high-voltage winding, and a notch first for accommodating the second conduit (211) is provided on the second enclosure (214); There are three groups of the sealing air guide structures at the top, which are respectively arranged between the top end of the coil winding (102) and the upper clamp (104); The four corners of the top of the upper sealing disk (216) are all threadedly connected with support bolts 2 (223), and the top ends of the support bolts 2 (223) respectively contact the bottom of the upper clamp (104). The combination of the upper sealing disk (216) and the support block 3 (217) is divided into two from the middle to form a detachable two-petal structure.

5. A dry-type transformer for double-split photovoltaic power generation according to claim 4, characterized in that: It also includes a high-temperature linkage assembly (3), wherein the high-temperature linkage assembly (3) includes a gear (309) rotatably connected to each side of the upper high-voltage winding; A groove three is provided in the middle of each support block three (217); a conduit three (218) is installed on the outer side of one of the support blocks three (217) in each group of the sealed air guide structure, and the conduit three (218) is connected to the inner groove three of the support block three (217); the outer port of the conduit three (218) is connected to the auxiliary air duct two (219), and the outer port of the auxiliary air duct two (219) is connected to the Rafale nozzle two (220); The sealing air guide structure at each group also includes a third ring (221) sleeved on the outside of the upper sealing disk (216), and a plurality of second slide bars (222) slidably fitted around the inside of the third ring (221), the second slide bars (222) being respectively mounted on the top of the side of the upper high-voltage winding, and the third ring (221) is provided with a second notch for accommodating the third conduit (218); One side of the gear (309) is meshedly connected with a rack gear 2 (310), the top end of the rack gear 2 (310) is correspondingly connected to the circle gear 3 (221), and the bottom end of the rack gear 2 (310) is correspondingly connected to the circle gear 2 (214).

6. A dry-type transformer for double-split photovoltaic power generation according to claim 5, characterized in that: The other side of the gear (309) is meshedly connected with a rack (308), a support arm (307) is installed in the middle of one side of the rack (308), one end of the support arm (307) is connected to a piston rod (304), a piston ring (303) is installed at the bottom end of the piston rod (304), the outside of the piston ring (303) is matched with a cylinder body (301), the cylinder body (301) is respectively correspondingly installed on the side of the high-voltage winding above, a groove (306) is opened on the upper side of the tube wall of the cylinder body (301) along its axial direction, the support arm (307) is respectively correspondingly matched in the inside of the groove (306), and the upper and lower ports of the cylinder body (301) are respectively installed with end covers (302); The lower end cover (302) is provided with a connecting pipe, one end of which is in communication with the interior of the cylinder body (301), and the other end of which is connected to a heating bottle (305). The heating bottles (305) are respectively arranged inside the second conduit (211); the interior of the heating bottles (305) is filled with a liquid that expands when heated.

7. A dry-type transformer for double-split photovoltaic power generation according to claim 6, characterized in that: It also includes a sound insulation and heat dissipation component (4), wherein bases (106) are provided on both sides of the bottom of the lower clamp (105), and the sound insulation and heat dissipation component (4) includes an upper cover plate (401) provided on the top of the upper clamp (104), a lower cover plate (402) provided between the lower clamp (105) and the base (106), side cover plates (403) provided on both sides of the upper cover plate (401), and side cover plates (404) provided on both sides of the upper cover plate (401); The inner sides of the upper cover plate (401), the lower cover plate (402), the side cover plate (403), and the edge cover plate (404) are all installed with sound insulation felt; the top of the side cover plate (403) is respectively connected to the two sides of the upper cover plate (401); the bottom of the side cover plate (403) is respectively connected to the two sides of the lower cover plate (402); the top of the edge cover plate (404) is respectively connected to the two sides of the upper cover plate (401); the bottom of the edge cover plate (404) is respectively connected to the two sides of the lower cover plate (402); and the contact edges between adjacent side cover plates (403) and edge cover plates (404) are connected to each other.

8. A dry-type transformer for double-split photovoltaic power generation according to claim 7, characterized in that: The sound insulation and heat dissipation assembly (4) further comprises a lower variable diameter trumpet tube (407) corresponding to the position of each coil winding (102) and installed in the middle of the side cover plate (403) on one side, the large diameter end of the lower variable diameter trumpet tube (407) extending toward the corresponding coil winding (102), the small diameter end of the lower variable diameter trumpet tube (407) correspondingly passing through the side cover plate (403), and the Laval nozzles (213) are respectively installed at the small diameter positions inside the lower variable diameter trumpet tube (407); The sound insulation and heat dissipation assembly (4) also includes an upper reducer trumpet (408) corresponding to the position of each coil winding (102) and installed above the side cover plate (403) on one side, the large diameter end of the upper reducer trumpet (408) extending toward the corresponding coil winding (102), the small diameter end of the upper reducer trumpet (408) correspondingly passes through the side cover plate (403), and the Rafale nozzle 2 (220) is respectively installed at the small diameter position inside the upper reducer trumpet (408).

9. A dry-type transformer for double-split photovoltaic power generation according to claim 7, characterized in that: The basic assembly (1) further comprises a lifting ring (107) mounted on the top of the upper clamp (104), and the top of the lifting ring (107) correspondingly passes through the upper cover plate (401); The basic component (1) also includes a low-voltage connection terminal (108) and a high-voltage connection terminal (109) corresponding to the position of each coil winding (102) and installed above one side of the upper clamp (104), each low-voltage connection terminal (108) is electrically connected to a low-voltage winding, and each high-voltage connection terminal (109) is electrically connected to a high-voltage winding, and the low-voltage connection terminal (108) and the high-voltage connection terminal (109) are both arranged above the upper cover plate (401).

10. A dry-type transformer for double-split photovoltaic power generation according to claim 7, characterized in that: The sound insulation and heat dissipation assembly (4) further comprises an upper rubber shock-absorbing pad (405) and a lower rubber shock-absorbing pad (406); the upper rubber shock-absorbing pad (405) is arranged between the upper cover plate (401) and the upper clamp (104); the lower rubber shock-absorbing pad (406) is arranged between the lower cover plate (402) and the lower clamp (105); and the base (106) is correspondingly mounted on two sides of the bottom of the lower cover plate (402).

Images