Intelligent rapid cooling device for main transformer terminal

Abstract

The invention discloses an intelligent rapid cooling device for a main transformer terminal, which belongs to the technical field of transformer cooling, and is characterized in that a compressor, a condenser and an evaporator are cooperated to form an intelligent refrigeration system, and the state change of a refrigerant in the intelligent refrigeration system is utilized to realize efficient heat transfer. A plurality of sets of evaporation refrigeration assemblies are arranged in the evaporator, a liquid refrigerant enters a steam pipe and is conveyed inwards in the spiral direction of the steam pipe, air introduced into the evaporator is conveyed in the spiral direction from inside to outside, and the liquid refrigerant and the air are subjected to reverse convection heat exchange along a spiral heat exchange channel; generated powerful dry cold air is conveyed to the main transformer equipment in multiple directions to be rapidly cooled, gas-liquid separation treatment is carried out on refrigerants after heat exchange, different backflow refrigeration channels are selected, the pressure of a refrigeration system is reduced based on the refrigeration premise, and in addition, the refrigerating capacity of the refrigeration system can be automatically adjusted according to the temperature of the main transformer equipment so as to meet the working requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer cooling, and more specifically, to an intelligent and rapid cooling device for main transformer terminals. Background Art

[0002] The main transformer is the core equipment in a substation, and its reliability directly affects the operation safety of the entire power system. The load capacity and service life of the main transformer mainly depend on its thermal characteristics, that is, its heat dissipation ability from the inside to the outside. Excessive internal temperature will accelerate the deterioration of the insulation performance.

[0003] High temperature weather leads to a continuous increase in the power consumption load. The power grid company has a great pressure to ensure power supply during the peak summer season. The main transformer equipment is old and has been in service for too long, and its own heat dissipation is poor. Overheating of the main transformer will cause problems such as insulation deterioration, increased losses, and reduced efficiency.

[0004] After retrieval, for example, the patent with the publication number CN116344166A discloses an adaptive cooling transformer, which applies an evaporation heat dissipation tube to the heat dissipation fins of the transformer, and dissipates heat through the evaporation and endothermic of the cooling medium in the evaporation heat dissipation tube. The evaporated cooling medium is condensed into a liquid medium through a condensation box and then flows back into the evaporation heat dissipation tube, and circulates through the phase change of the cooling medium to achieve heat dissipation of the heat dissipation fin group.

[0005] This patent directly relies on the contact between the evaporation heat dissipation tube and the heat dissipation fins for heat exchange. In a high-temperature environment, since the evaporation speed of the coolant will increase, the heat dissipation effect of the evaporation heat dissipation tube will be affected. In addition, when the power of the transformer is large or the heat dissipation requirement is high, relying solely on the evaporation heat dissipation tube may not be able to meet the heat dissipation demand.

[0006] Therefore, in view of the existing problems, an intelligent and rapid cooling device for main transformer terminals is proposed to improve the cooling system of the in-service transformer, reduce the oil temperature rise of the transformer, and ensure the safe operation of the transformer. Summary of the Invention

[0007] The purpose of the present invention is to solve existing practical problems, and compared with the existing technology, an intelligent and rapid cooling device for main transformer terminals is provided.

[0008] The object of the present invention can be achieved by the following technical solutions: A main transformer terminal intelligent rapid cooling device, including a main box body and a compressor, a condenser, and an evaporator installed inside it. The condenser is internally provided with a heat exchange component. The heat exchange component includes a circulation sleeve rotatably driven and installed at the upper and lower ends of the condenser. A reflux pipe penetrating upward and downward is fixedly installed between a pair of circulation sleeves. A heat exchange pipe connecting the two circulation sleeves is sleeved on the end wall of the reflux pipe. The upper and lower ends of the condenser are respectively provided with a refrigerant outlet pipe and a refrigerant inlet pipe connected to the two circulation sleeves. Among them, the refrigerant inlet pipe is connected to the compressor. The refrigerant outlet pipe and the upper end of the reflux pipe are jointly connected to a heat exchange throttling component. The liquid outlet end of the heat exchange throttling component is connected to the evaporator; The evaporator is internally provided with multiple groups of evaporation refrigeration components. The evaporation refrigeration components include stacked sheets arranged up and down and a spiral flow divider installed between the two. Multiple evaporation pipes are arranged up and down along the spiral direction inside the spiral flow divider and are connected to the liquid outlet end of the heat exchange throttling component and are arranged in a planar spiral shape; The inner ends of multiple evaporation pipes are jointly connected to a refrigerant return pipe. An air inlet pipe communicating with the middle part of the lowermost evaporation refrigeration component is installed outside the evaporator through a suction fan. The middle parts of the upper and lower two evaporation refrigeration components are connected through a gas connecting piece. The air outlet part of the uppermost evaporation component is externally connected to a high-frequency fan for cooling the main transformer equipment through an exhaust pipe.

[0009] Further, the heat exchange pipe is a spiral structure distributed along the vertical direction and is provided with multiple groups from bottom to top. Each group of heat exchange pipes is distributed with multiple pipes along the spiral direction from the inside to the outside. Annular diversion cavities communicating with the end parts of the heat exchange pipes are opened on the end walls of the two circulation sleeves. The upper and lower pairs of annular diversion cavities are respectively connected and arranged with a pair of cold liquid pipes.

[0010] Further, the upper and lower ends of the condenser are respectively provided with liquid guide pipes for the coolant to circulate. A refrigeration water tank is arranged inside the main box body. The two liquid guide pipes are respectively connected to the refrigeration water tank.

[0011] Further, the heat exchange throttling component includes a heat exchanger and a mixing throttle. The refrigerant outlet pipe and the upper end of the reflux pipe are respectively communicated with the shell-side inlet and the tube-side inlet of the heat exchanger. The shell-side outlet and the tube-side outlet are jointly connected to the liquid inlet end of the mixing throttle.

[0012] Further, an isolation cylinder with a closed upper end is arranged inside the mixing throttle. An annular gas mixing cavity is formed between the isolation cylinder and the inner wall of the mixing throttle. Multiple capillary throttle pipes communicating with the annular gas mixing cavity are distributed inside the isolation cylinder. A drain pipe communicating with the upper ends of the multiple capillary throttle pipes and connected to the evaporation pipes on the evaporation refrigeration component is arranged at the top end of the isolation cylinder.

[0013] Further, a partition is fixed between a pair of upper and lower laminations, which is attached to the outer wall of the fitting spiral flow divider and is disposed adjacent to the outer spiral end of the spiral flow divider. A heat exchange channel that spirally distributes from the inside to the outside is formed between the partition and the spiral flow divider.

[0014] Further, the gas connection member includes a gas guide pipe fixedly connected to the lamination and communicating with the outermost part of the heat exchange channel. The upper end of the gas guide pipe is fixedly connected to a gas supply pipe that extends upward to the middle of the previous evaporation refrigeration component. An overflow port communicating with the middle of the heat exchange channel is formed on the gas supply pipe.

[0015] Further, the bottom end of the refrigerant return pipe is externally connected to a circulation pipe that penetrates to the outside of the evaporator. The other end of the circulation pipe is connected to a gas-liquid separator. The gas outlet of the gas-liquid separator is connected to the compressor, and the liquid outlet of the gas-liquid separator is communicated with the lower end of the return pipe.

[0016] Compared with the prior art, the advantages of the present invention are as follows: In this solution, an intelligent refrigeration system is constituted by the coordinated cooperation among a compressor, a condenser, and an evaporator. The high-efficient transfer of heat is achieved by utilizing the state change of the refrigerant in the intelligent refrigeration system. A plurality of evaporation refrigeration components are arranged in the vertical direction in the evaporator. The evaporation refrigeration component is composed of laminations, a spiral flow divider, and a plurality of steam pipes. The liquid refrigerant enters the steam pipe and is conveyed inward along its spiral direction, while the air introduced into the evaporator is conveyed from the inside to the outside along the spiral direction. The two flow in the reverse direction in the spirally arranged heat exchange channel for heat exchange. This process reduces the unit heat exchange gap, increases the gas-liquid flow velocity impact, prolongs the overall heat exchange length, expands the overall heat exchange area, and with the means of step-by-step cooling, the generated strong drying cold air acts on the main transformer equipment. During the entire refrigeration process, the refrigeration capacity is automatically adjusted according to the temperature of the main transformer equipment to ensure that the temperature of the main transformer equipment is always within a reasonable range.

[0017] In this solution, a heat exchange throttling component is added between the condenser and the evaporator, and the refrigerant return pipe for discharging the liquid refrigerant is externally connected to a gas-liquid separator. The vaporized refrigerant and the unevaporated liquid refrigerant are transported into the gas-liquid separator for gas-liquid separation. The separated gaseous refrigerant is directly transported into the compressor for recycling, while the separated liquid refrigerant is transported into the return pipe of the condenser to participate in the heat exchange and cooling process. Compared with directly introducing it into the compressor, the working burden of the compressor is reduced, and it is jointly transported into the heat exchanger with the liquid refrigerant generated by the normal cooperation of the compressor and the condenser for heat exchange, reducing the temperature difference between the two liquid refrigerants, and jointly transported into the mixing throttler for mixing and then throttling treatment, so as to provide low-temperature and low-pressure liquid refrigerant for the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the internal structure of the main box body of the present invention; Figure 2Schematic diagram of the internal structure of the condenser of the present invention; Figure 3 Partial cross-sectional view of the hybrid throttler of the present invention; Figure 4 Overall cross-sectional view of the hybrid throttler of the present invention; Figure 5 Internal cross-sectional view of the evaporator of the present invention; Figure 6 Schematic diagram of the structure of multiple groups of evaporation refrigeration components of the present invention; Figure 7 Exploded view of the evaporation refrigeration component of the present invention; Figure 8 Exploded view between the spiral flow dividing plate and the evaporation tube of the present invention; Figure 9 Internal top view of the evaporation heat exchange component of the present invention.

[0019] Explanation of the reference numerals in the figure: 1, main box body; 2, compressor; 3, condenser; 31, return pipe; 32, heat exchange pipe; 33, circulation sleeve; 34, transmission gear; 4, heat exchanger; 5, hybrid throttler; 51, isolation cylinder; 52, capillary throttle pipe; 53, drain pipe; 6, evaporator; 61, laminations; 62, spiral flow dividing plate; 621, partition plate; 63, intake pipe; 64, evaporation tube; 65, supply pipe; 66, refrigerant return pipe; 67, exhaust pipe; 68, guide pipe; 69, circulation pipe; 7, exhaust fan; 8, high-frequency fan; 9, gas-liquid separator. Detailed implementation manners

[0020] 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.

[0021] Embodiment 1: Aiming at the problem that the main transformer equipment has poor self-cooling due to its old age and long service time in a high-temperature environment, the following technical solutions are proposed: The present invention discloses a main transformer terminal intelligent rapid cooling device. Please refer to Figure 1 - Figure 2 , which includes a main box body 1 and a compressor 2, a condenser 3, and an evaporator 6 installed inside it. A heat exchange component is rotatably installed inside the condenser 3; The heat exchange component includes a circulation sleeve 33 rotatably driven and installed at the upper and lower ends of the condenser 3. A return pipe 31 penetrating upward and downward is fixedly installed between a pair of circulation sleeves 33. A heat exchange pipe 32 communicating between the pair of circulation sleeves 33 is sleeved on the end wall of the return pipe 31. There are multiple groups of heat exchange pipes 32 arranged from bottom to top. Each group of heat exchange pipes 32 is distributed with a plurality of pipes along the spiral direction from the inside to the outside. Annular diversion cavities communicating with the ends of the heat exchange pipes 32 are opened on the end walls of the pair of circulation sleeves 33. The upper and lower pair of annular diversion cavities are respectively communicated with a pair of cold liquid pipes; A driving motor for rotatably driving the circulation sleeve 33 is provided on one side of the top end of the main box body 1. The driving end of the driving motor and the outer wall of the upper circulation sleeve 33 are both fixedly sleeved with transmission gears 34 that are meshed with each other. Note that rotary joints are respectively provided at the upper and lower ends of the return pipe 31 to realize the rotation operation of the heat exchange component without affecting the pipeline connection relationship; A refrigerant outlet pipe and a refrigerant inlet pipe communicating with a pair of circulation sleeves 33 are respectively provided at the upper and lower ends of the condenser 3. Liquid guide pipes for circulating coolant are respectively provided at the upper and lower ends of the condenser 3. A refrigeration water tank is provided inside the main box body 1. The pair of liquid guide pipes are respectively connected to the refrigeration water tank. The cooperation of the pair of liquid guide pipes and the refrigeration water tank realizes the circulating supply of coolant into the condenser 3 from top to bottom. The refrigerant inlet pipe is connected to the compressor 2. The refrigerant outlet pipe and the upper end of the return pipe 31 are jointly connected to a heat exchange throttling component. The liquid outlet end of the heat exchange throttling component is connected to the evaporator 6.

[0022] The gaseous refrigerant enters the compressor. The compressor compresses the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant. After the high-temperature and high-pressure gaseous refrigerant enters the condenser 3, it is spirally conveyed upward along the heat exchange pipe 32 and undergoes reverse heat exchange and cooling with the circulating coolant conveyed downward inside the condenser 3; In this process, the driving motor is started, and the driving motor drives the return pipe 31, the heat exchange pipe 32, and the circulation sleeve 33 to rotate, which not only changes the heat exchange orientation of multiple groups of heat exchange pipes 32 but also agitates the circulating coolant, effectively improving the heat exchange effect between the two. The gaseous refrigerant gradually cools down during this process, releases heat and cools and condenses into a high-pressure liquid refrigerant, and at the same time releases a large amount of heat energy.

[0023] The high-pressure liquid refrigerant is further heat-exchanged through the heat exchange throttling component. In this process, the pressure of the liquid refrigerant is reduced to become a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant absorbs the heat of the surrounding environment in the evaporator and evaporates into a gas, thereby achieving the refrigeration effect.

[0024] Please refer to Figure 5 - Figure 9, inside the evaporator 6, there are multiple groups of mutually linked evaporation and refrigeration components distributed vertically. The evaporation and refrigeration components include stacked plates 61 arranged vertically and a spiral shunt plate 62 installed between the two. Inside the spiral shunt plate 62, there are multiple evaporation tubes 64 distributed vertically along its spiral direction, which are connected to the liquid outlet end of the heat exchange and throttling component and are arranged in a planar spiral. Between a pair of stacked plates 61 above and below, there is a partition plate 621 fixed to the outer wall of the spiral shunt plate 62 and adjacent to the outer spiral end of the spiral shunt plate 62. The space between the partition plate 621 and the spiral shunt plate 62 forms a heat exchange channel spirally distributed from the inside to the outside; The inner ends of multiple evaporation tubes 64 are commonly connected to a refrigerant return pipe 66 that penetrates the lowermost stacked plate 61. Outside the evaporator 6, an air inlet pipe 63 communicating with the middle of the lowermost evaporation and refrigeration component is installed through a suction fan 7. Between the middles of two adjacent evaporation and refrigeration components above and below, they are connected through a gas connection component. The gas outlet part of the uppermost evaporation component is externally connected to a high-frequency fan 8 for cooling the main transformer equipment through an exhaust pipe 67.

[0025] The gas connection component includes a gas guide pipe 68 fixedly connected to the stacked plate 61 and communicating with the outermost part of the heat exchange channel. The upper end of the gas guide pipe 68 is fixedly connected to a gas supply pipe 65 that extends upward to the middle of the upper evaporation and refrigeration component. An air overflow port communicating with the middle of the heat exchange channel is opened on the gas supply pipe 65, and the air overflow port communicates with the middle of the heat exchange channel.

[0026] Inside the evaporator, multiple groups of multi-stage evaporation and refrigeration components are arranged vertically. The evaporation and refrigeration components are composed of stacked plates 61, a spiral shunt plate 62, and multiple groups of evaporation tubes 64. The low-temperature and low-pressure liquid refrigerant enters the evaporation tubes 64 and is transported inward along the spiral direction, while the air introduced into the evaporator is transported from the inside to the outside along the spiral direction. The two flow in reverse along the spiral gap for heat exchange, reducing the unit heat exchange gap, increasing the gas-liquid flow velocity impact, extending the overall heat exchange length, expanding the overall heat exchange area, and enhancing the gas-liquid heat exchange effect; The liquid refrigerant transported to the inner side of the evaporation tubes 64, that is, the heat-exchanged liquid refrigerant, is transported downward by the refrigerant return pipe 66. During this process, evaporation and cooling heat exchange are carried out successively from bottom to top, so that the upward-transported air is cooled step by step. The generated strong and dry cold air is discharged into the high-frequency fan 8 through the exhaust pipe 67. The high-frequency fan 8 outputs dry cold air with a temperature 20°C lower than the ambient temperature and a pressure of 5000 Pa, and blows the cold air at multiple angles and in a targeted manner to the radiator fins and other positions of the main transformer equipment through a heat-insulating pipe, quickly reducing the oil temperature; A smart refrigeration system is formed by the coordinated cooperation among a compressor, a condenser, and an evaporator. It can automatically adjust the refrigeration capacity according to the temperature of the main transformer equipment, ensuring that the temperature of the main transformer equipment is always within a reasonable range. If the refrigeration capacity needs to be increased, the control system will start the compressor and adjust the operating frequency of the compressor or the opening degree of the electronic expansion valve according to the temperature deviation to increase the refrigerant flow rate and evaporation speed, thereby increasing the refrigeration capacity. It can also increase the air volume delivery of the exhaust fan 7 and, with step-by-step cooling, increase the dry cold air volume delivered to the main transformer equipment. The specific intelligent adjustment can be set according to the actual situation.

[0027] Embodiment 2: On the basis of Embodiment 1, the refrigeration system is further improved and optimized. The specific description is as follows: Please refer to Figure 1 and Figure 3 - Figure 4 . The refrigerant outlet pipe and the upper end of the return pipe 31 are jointly connected with a heat exchange throttling assembly. The liquid outlet end of the heat exchange throttling assembly is connected to the evaporator 6. The heat exchange throttling assembly includes a heat exchanger 4 and a mixing throttle 5. The upper ends of the refrigerant outlet pipe and the return pipe 31 are respectively connected to the shell-side inlet and the tube-side inlet of the heat exchanger 4, and the shell-side outlet and the tube-side outlet are jointly connected to the liquid inlet end of the mixing throttle 5; Inside the mixing throttle 5, there is an isolation cylinder 51 with its upper end closed. An annular gas mixing chamber is formed between the isolation cylinder 51 and the inner wall of the mixing throttle 5. A plurality of capillary throttle pipes 52 communicating with the annular gas mixing chamber are distributed inside the isolation cylinder 51. The top end of the isolation cylinder 51 is provided with a drain pipe 53 connected to the upper ends of the plurality of capillary throttle pipes 52 and communicating with the evaporation pipe 64 on the evaporation and refrigeration assembly; The bottom end of the refrigerant return pipe 66 is externally connected with a circulation pipe 69 penetrating outside the evaporator 6. The other end of the circulation pipe 69 is connected to a gas-liquid separator 9. The gas outlet of the gas-liquid separator 9 is connected to the compressor 2, and the liquid outlet of the gas-liquid separator 9 is connected to the lower end of the return pipe 31.

[0028] With multi-stage evaporation heat exchange, the refrigeration load processed by the evaporation and refrigeration assembly in the upper part gradually decreases. Therefore, part of the liquid refrigerant input in the upper part is not evaporated into gas. The gaseous refrigerant and the unevaporated liquid refrigerant are transported to the gas-liquid separator 9 through the refrigerant return pipe 66 and the circulation pipe 69 for gas-liquid separation. The separated gaseous refrigerant is directly transported into the compressor 2 for recycling; The separated liquid refrigerant is transported into the return pipe 31 of the condenser 3 to participate in the heat exchange and cooling process. This is because if the unevaporated liquid refrigerant is directly returned to the compressor, it may increase the burden on the compressor due to its lower temperature, because the compressor needs to heat it to a higher temperature to achieve the compression process. Therefore, the separated liquid refrigerant is directly cooled by being introduced into the condenser 3 to reduce the working burden of the compressor 2; There is a certain temperature difference between the liquid refrigerant processed in this process and the liquid refrigerant generated by the normal cooperation of the compressor and the condenser. Therefore, the two liquid refrigerants are jointly transported into the heat exchanger 4 for heat exchange. The heat exchanger 4 is a shell-and-tube heat exchanger. After heat exchange, the temperature difference between the two liquid refrigerants is reduced. At this time, the two liquid refrigerants are jointly transported into the mixing throttle 5; The liquid refrigerant is transported downward through the annular gas mixing chamber. This process realizes the mixing process between the two. The mixed liquid refrigerant is then transported into a plurality of capillary throttle tubes 52 for throttling treatment. In this process, the pressure of the liquid refrigerant is reduced. The low-temperature and low-pressure liquid refrigerant can more fully absorb the heat of the surrounding environment in the evaporator, improving its refrigeration effect.

[0029] The present invention constitutes an intelligent refrigeration system through the coordinated cooperation among the compressor, the condenser, and the evaporator, and uses the state change of the refrigerant in the intelligent refrigeration system to achieve efficient heat transfer. A plurality of evaporation refrigeration components are arranged in the evaporator. The liquid refrigerant enters the steam pipe and is transported inward along its spiral direction, while the air introduced into the evaporator is transported outward along the spiral direction from the inside out. The two perform reverse convective heat exchange along the spiral heat exchange channel, and with the means of gradually reducing the temperature, the generated strong and dry cold air is transported in multiple directions to the main transformer equipment for rapid cooling. After heat exchange, the refrigerant undergoes gas-liquid separation treatment, and different reflux refrigeration channels are selected. Based on the refrigeration premise, the pressure of the refrigeration system is reduced. In addition, the refrigeration capacity of the refrigeration system can be automatically adjusted according to the temperature of the main transformer equipment to meet the working requirements.

[0030] The above; only the preferred specific embodiments of the present invention; but the protection scope of the present invention is not limited thereto; any person skilled in the art within the technical scope disclosed by the present invention; according to the technical solution of the present invention and its improved conceptions, making equivalent substitutions or changes; should be covered by the protection scope of the present invention.

Claims

1. An intelligent and rapid cooling device for a main transformer terminal, comprising a main box body (1) and a compressor (2), a condenser (3), and an evaporator (6) installed inside it, characterized in that: The condenser (3) is internally provided with a heat exchange assembly. The heat exchange assembly includes flow sleeves (33) rotatably driven and installed at the upper and lower ends of the condenser (3). A reflux pipe (31) penetrating through vertically and outward is fixed between a pair of flow sleeves (33). A heat exchange pipe (32) connecting the pair of flow sleeves (33) is sleeved on the end wall of the reflux pipe (31). The upper and lower ends of the condenser (3) are respectively provided with a refrigerant outlet pipe and a refrigerant inlet pipe communicating with the pair of flow sleeves (33). The refrigerant inlet pipe is connected to the compressor (2), and the refrigerant outlet pipe and the upper end of the reflux pipe (31) are jointly connected to a heat exchange throttling assembly acting on the evaporator (6). The evaporator (6) is internally provided with multiple groups of evaporation refrigeration assemblies. The evaporation refrigeration assemblies include stacked plates (61) arranged vertically and a spiral flow dividing plate (62) installed between the two. Multiple evaporation pipes (64) are arranged vertically along the spiral direction inside the spiral flow dividing plate (62). The evaporation pipes (64) are connected to the liquid outlet end of the heat exchange throttling assembly and are arranged in a planar spiral shape. The inner ends of the multiple evaporation pipes (64) are jointly connected to a refrigerant reflux pipe (66). The middle air inlet part of the lowermost evaporation refrigeration assembly is connected to a suction fan (7) through an air inlet pipe (63). The middle parts between the upper and lower two evaporation refrigeration assemblies are connected through a gas connection member. The air outlet part of the uppermost evaporation assembly is externally connected to a high-frequency fan (8) through an exhaust pipe (67).

2. The intelligent and rapid cooling device for main transformer terminal according to claim 1, wherein: The heat exchange pipe (32) is a spiral structure distributed along the vertical direction and is provided with multiple groups from bottom to top. Each group of heat exchange pipes (32) is distributed with multiple pipes along the spiral direction from inside to outside. Annular diversion cavities communicating with the end parts of the heat exchange pipes (32) are formed on the end walls of the pair of flow sleeves (33). The upper and lower pair of annular diversion cavities are respectively communicated with a pair of cold liquid pipes.

3. The intelligent and rapid cooling device for main transformer terminal according to claim 1, characterized in that: The upper and lower ends of the condenser (3) are respectively provided with liquid guide pipes for the coolant to circulate. A refrigeration water tank is arranged inside the main box body (1). The pair of liquid guide pipes are respectively connected to the refrigeration water tank.

4. The intelligent rapid cooling device for main transformer terminal according to claim 1, characterized in that: The heat exchange throttling assembly includes a heat exchanger (4) and a mixing throttle (5). The refrigerant outlet pipe and the upper end of the reflux pipe (31) are respectively communicated with the shell-side inlet and the tube-side inlet of the heat exchanger (4). The shell-side outlet and the tube-side outlet are jointly connected to the liquid inlet end of the mixing throttle (5).

5. The intelligent and rapid cooling device for main transformer terminal according to claim 4, characterized in that: The mixing throttle (5) is internally provided with an isolation cylinder (51) with a closed upper end. An annular gas mixing cavity is formed between the isolation cylinder (51) and the inner wall of the mixing throttle (5). A plurality of capillary throttle pipes (52) communicating with the annular gas mixing cavity are distributed inside the isolation cylinder (51). A discharge pipe (53) communicating with the upper ends of the plurality of capillary throttle pipes (52) and the outer ends of the evaporation pipes (64) is arranged at the top end of the isolation cylinder (51).

6. The intelligent rapid cooling device for main transformer terminal according to claim 1, characterized in that: A partition plate (621) fixed between the upper and lower pair of stacked plates (61) and attached to the outer wall of the spiral flow dividing plate (62) and adjacent to the outer spiral end of the spiral flow dividing plate (62) is provided. A heat exchange channel spirally distributed from inside to outside is formed between the partition plate (621) and the spiral flow dividing plate (62).

7. The intelligent and rapid cooling device for main transformer terminal according to claim 6, wherein: The gas connection member includes an air duct (68) fixedly connected to the stack (61) and communicating with the outermost part of the heat exchange channel. The upper end of the air duct (68) is fixedly connected to an air supply pipe (65) extending upward to the middle of the previous evaporation cooling assembly. An air overflow port communicating with the middle of the heat exchange channel is formed on the air supply pipe (65).

8. The intelligent and rapid cooling device for main transformer terminal according to claim 7, characterized in that: The bottom end of the refrigerant return pipe (66) is externally connected to a circulation pipe (69) penetrating outside the evaporator (6). The other end of the circulation pipe (69) is connected to a gas-liquid separator (9). The gas outlet of the gas-liquid separator (9) is connected to the compressor (2) through a gas pipe, and the liquid outlet of the gas-liquid separator (9) is communicated with the lower end of the return pipe (31) through a conduit.

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