Heat recovery system for main transformer chamber of transformer substation

Abstract

The invention provides a transformer substation main transformer room heat recovery system, which belongs to the technical field of transformer substations, and comprises a transformer room, an internal circulation system and a heat pump system, a mounting foundation is arranged in the transformer chamber; the internal circulation system comprises a circulation air pipe, an air inlet of the circulation air pipe is located in the upper portion of the transformer chamber, an air outlet is lower than the upper end face of the installation foundation, and a fan is arranged in the circulation air pipe. The heat pump system comprises an evaporator, a compressor, a condenser and an expansion valve, the evaporator and the expansion valve are sequentially installed in the circulating air pipe on the downstream of the fan in the longitudinal direction, and an included angle is formed between the evaporator and the axial direction of the circulating air pipe. According to the heat recovery system for the main transformer chamber of the transformer substation, air in the transformer chamber forms internal circulation under the action of the circulating air pipe, and the evaporator located in the circulating air pipe effectively captures and converts waste heat resources released in the operation process of the transformer; an included angle is formed between the evaporator and the axial direction of the circulating air pipe, so that the contact area between the evaporator and air in the circulating air pipe can be increased.

Description

Technical Field

[0001] The invention belongs to the technical field of transformer substations, and more specifically, relates to a heat recovery system for a main transformer room of a transformer substation. Background Art

[0002] With the rapid development of the electric power industry, substations, as key nodes in the power transmission and distribution network, have become important directions for technological innovation in the industry in terms of operational stability and energy efficiency optimization. As the core equipment for energy conversion in substations, transformers inevitably generate a large amount of heat during operation, which will affect the operating efficiency and service life of transformers. If this heat is not utilized and directly discharged into the environment, it will not only waste energy but also cause thermal pollution to the environment.

[0003] In order to reduce noise nuisance, the transformer and reactor rooms are currently designed to be closed without ventilation windows or exhaust fans. The temperature of the transformer and reactor rooms can reach above 60°C in high temperature and high load seasons. Although current equipment can operate at temperatures above 80°C, the auxiliary devices and measuring devices in the transformer / reactor room are unstable and cause false alarms and accelerated equipment aging due to long-term operation at high temperatures. Summary of the invention

[0004] The purpose of the present invention is to provide a heat recovery system for a main transformer room of a substation, aiming to solve the problem of recovering and utilizing the heat generated in the transformer room.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a heat recovery system for the main transformer room of a substation, including a transformer room, an internal circulation system and a heat pump system; the transformer room is provided with an installation foundation for carrying a transformer; the internal circulation system includes a circulating air duct, the air inlet of the circulating air duct is located at the upper part of the transformer room, the air outlet of the circulating air duct is located at one side of the installation foundation, the air outlet is lower than the upper end surface of the installation foundation, and the circulating air duct is provided with a fan; the heat pump system includes an evaporator, a compressor, a condenser and an expansion valve, the evaporator and the expansion valve are longitudinally installed in sequence in the circulating air duct downstream of the fan, the condenser is located on the outside of the transformer room, one end of the condenser is connected to the evaporator by means of the compressor, and the other end of the condenser is connected to the expansion valve; the evaporator is arranged at an angle to the axial direction of the circulating air duct.

[0006] As another embodiment of the present application, the evaporator is fixed to the pipe wall of the circulating air duct by means of a connecting bracket; the connecting bracket includes a support frame and a mesh plate, the support frame includes a plurality of frame rods fixedly connected transversely and longitudinally, and both ends of the support frame are connected to the pipe wall of the circulating air duct; the evaporator is installed on the support frame, and the mesh plate is laid between the evaporator and the support frame.

[0007] As another embodiment of the present application, the end of the support frame has a support member, and the support member includes a first fixing member and a second fixing member, the first fixing member includes a longitudinal portion and a transverse portion, the longitudinal portion is attached to the pipe wall of the circulating air duct, and the transverse portion is vertically connected to the upper end of the longitudinal portion and extends toward a side away from the pipe wall; the second fixing member is a trapezoidal block, the second fixing member is located at the upper end of the transverse portion, and the upper end of the second fixing member has an inclined surface, and the inclined surface is attached to the bottom end of the support frame.

[0008] As another embodiment of the present application, the mesh plate is a rigid plate, and a connecting beam is provided between the mesh plate and the support frame, the connecting beam is located below the center line of the mesh plate, and the connecting beam is fixedly connected to a rotating shaft; a driving structure is installed on the tube wall, and a driving motor is provided in the driving structure, and an output end of the driving motor is connected to the rotating shaft to drive the rotating shaft to drive the evaporator to rotate longitudinally; a limiting groove is provided on the driving structure, and a limiting roller is provided at the end of the support frame, and the limiting roller cooperates with the limiting groove to limit the rotation angle of the rotating shaft.

[0009] As another embodiment of the present application, the driving structure includes a driving box, which is fixedly mounted on the tube wall. The inner cavity of the driving box is used to install the driving motor and the linkage assembly. The rotating shaft passes through the side plate of the driving box and cooperates with the side plate of the driving box by means of bearings; the linkage assembly includes a driving gear and a driven gear, the driving gear is sleeved on the output shaft of the driving motor, and the driven gear is sleeved on the shaft section of the rotating shaft extending into the inner cavity of the driving box; the driving gear and the driven gear are meshed.

[0010] As another embodiment of the present application, the driving gear includes a smooth portion and a tooth portion, and the tooth portion is meshed with the driven gear; the central angle occupied by the tooth portion is not less than 90°, and the rotation angle of the driven gear is not greater than 75°. Correspondingly, the limiting groove is an arc groove, and the central angle of the limiting groove is consistent with the maximum rotation angle of the driven gear.

[0011] As another embodiment of the present application, a first flexible pipe section is provided between the evaporator and the compressor, and a second flexible pipe section is provided between the evaporator and the expansion valve, the first flexible pipe section and the second flexible pipe section are respectively located above and below the evaporator, and the first flexible pipe section and the second flexible pipe section are both limited by a fixed structure installed on the pipe wall of the circulating air duct; the fixed structure includes a fixed shaft, a rotating sleeve and a torsion spring, the fixed shaft is fixed on the pipe wall, and both ends of the fixed shaft have limiting baffles, the torsion spring and the rotating sleeve are sequentially sleeved on the outside of the fixed shaft, one end of the torsion spring is connected to the fixed shaft, and the other end of the torsion spring is connected to the rotating sleeve; the first flexible pipe section / the second flexible pipe section is wound around the outside of the rotating sleeve.

[0012] As another embodiment of the present application, the circulating air duct includes an air inlet section, an air outlet section and a heat recovery section; the heat recovery section includes multiple Class I air ducts, multiple Class II air ducts and a heat recovery air duct, multiple Class I air ducts are arranged in parallel, the inlet ends of the multiple Class I air ducts are connected to the air inlet section, and the outlet ends are connected to the heat recovery air duct, the evaporator is installed in the heat recovery air duct, and the heat recovery air duct is connected to the air outlet section; multiple Class II air ducts are arranged in parallel, the inlet ends of the multiple Class II air ducts are connected to the air inlet section, and the outlet ends are connected to the air outlet section; both the Class I air ducts and the Class II air ducts are provided with opening and closing valves.

[0013] As another embodiment of the present application, there are multiple fans, and the multiple fans are correspondingly installed in the first type of air duct / the second type of air duct, and the first type of air duct / the second type of air duct is provided with an injection pipe section. The injection pipe section in the same first type of air duct / the second type of air duct is located at the front side or the rear side of the fan, and the injection pipe section includes a tapered section and a gradually expanding section connected in sequence.

[0014] As another embodiment of the present application, a ventilation base is also provided in the circumference of the installation base, and the air outlet is located in the space between the ventilation base and the floor; the ventilation base includes a perforated plate area allowing air circulation, and the perforated plate area is surrounded by the circumference of the installation base; the air inlet extends to above the transformer, and a mesh cover plate is installed at the air inlet.

[0015] The beneficial effects of the heat recovery system for the main transformer room of the substation provided by the present invention are: compared with the prior art, in the heat recovery system for the main transformer room of the substation provided by the present invention, the air in the transformer room forms an internal circulation under the action of the circulating air duct, and is cooled in the circulating air duct; and the evaporator located in the circulating air duct effectively captures and converts the waste heat resources released during the operation of the transformer, so as to be efficiently utilized by the air source heat pump unit; the internal circulation system and the heat pump system work together to ensure efficient hot air circulation between the indoor environment of the main transformer, and jointly construct a complete and efficient heat energy recovery and utilization system; in addition, the evaporator is angled with the axial direction of the circulating air duct, which can increase the contact area between the evaporator and the air in the circulating air duct, and increase the flow time and heat exchange effect of the air by changing the flow direction of the air after entering the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic structural diagram of a heat recovery system for a main transformer room of a substation provided by a first embodiment of the present invention; Figure 2 for Figure 1 The enlarged view of point A in the middle; Figure 3 A schematic diagram of the structure of a heat recovery system for a main transformer room of a substation provided by a second embodiment of the present invention; Figure 4 A schematic diagram of the structure of a heat recovery section provided in a second embodiment of the present invention; Figure 5 A schematic structural diagram of a connecting bracket provided in a third embodiment of the present invention; Figure 6 A schematic diagram of the structure of a driving structure provided in a third embodiment of the present invention; Figure 7 A schematic diagram of the connection between a driving gear and a driven gear provided in the third embodiment of the present invention.

[0018] In the figure: 1. transformer room; 2. transformer; 3. installation foundation; 4. circulating air duct; 5. air inlet; 6. air outlet; 7. fan; 8. condenser; 9. compressor; 10. evaporator; 11. first fixing member; 12. second fixing member; 13. expansion valve; 14. mesh cover plate; 15. injection pipe section; 16. guide vane; 17. ventilation foundation; 18. orifice plate area; 19. air inlet section; 20. first type air duct; 21. heat recovery air duct; 22. second type air duct; 23. air outlet section; 24. limiting groove; 25. support frame; 26. auxiliary beam; 27. rotating shaft; 28. connecting beam; 29. ​​mesh plate; 30. adapter plate; 31. drive box; 32. drive motor; 33. drive gear; 34. driven gear; 35. fixed shaft; 36. rotating sleeve; 37. torsion spring. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] See also Figures 1 to 7 , the heat recovery system of the main transformer room of the substation provided by the present invention is now described. The heat recovery system of the main transformer room of the substation includes a transformer room 1, an internal circulation system and a heat pump system; the transformer room 1 has a mounting base 3 for carrying a transformer 2; the internal circulation system includes a circulating air duct 4, the air inlet 5 of the circulating air duct 4 is located at the upper part of the transformer room 1, the air outlet 6 of the circulating air duct 4 is located on one side of the mounting base 3, the air outlet 6 is lower than the upper end surface of the mounting base 3, and the circulating air duct 4 has a fan 7; the heat pump system includes an evaporator 10, a compressor 9, a condenser 8 and an expansion valve 13, the evaporator 10 and the expansion valve 13 are longitudinally installed in the circulating air duct 4 downstream of the fan 7 in sequence, the condenser 8 is located outside the transformer room 1, one end of the condenser 8 is connected to the evaporator 10 by means of the compressor 9, and the other end of the condenser 8 is connected to the expansion valve 13; the evaporator 10 is arranged at an angle to the axial direction of the circulating air duct 4.

[0021] Compared with the prior art, the heat recovery system for the main transformer room of the transformer station provided by the present invention is that the hot air generated by the heat generated by the transformer 2 in the transformer room 1 moves upward and enters the circulating air duct 4 from the air inlet 5 through the action of the fan 7. The circulating air duct 4 is equipped with an evaporator 10. The evaporator 10 exchanges heat with the hot air entering the circulating air duct 4 to cool the air. The cooled air is discharged from the air outlet 6 of the circulating air duct 4 back to the lower part of the transformer room 1. The air in the transformer room 1 forms an internal circulation under the action of the circulating air duct 4 and is cooled in the circulating air duct 4. The evaporator 10 inside effectively captures and converts the waste heat resources released during the operation of the transformer 2 for efficient use by the air source heat pump unit; the internal circulation system and the heat pump system work together to ensure efficient hot air circulation between the environment in the main transformer room 1, and jointly construct a complete and efficient heat energy recovery and utilization system; in addition, the evaporator 10 is angled with the axis of the circulating air duct 4, which can increase the contact area between the evaporator 10 and the air in the circulating air duct 4, and increase the flow time and heat exchange effect of the air by changing the flow direction of the air after entering the evaporator 10.

[0022] The air inlet 5 is located in the top area of ​​the transformer room 1 where the high-temperature air naturally rises. The air inlet 5 is equipped with an air inlet device, which integrates a wire mesh and a guide vane 16 system. The wire mesh is the first line of protection. Its precise mesh not only blocks dust and particles in the air, ensures the cleanliness of the internal system and the stability of equipment operation, but also reduces maintenance costs. The guide vanes 16 that follow guide the naturally rising hot air so that it enters the cooling system in a smoother and more orderly path, significantly improving the efficiency and accuracy of heat exchange, thereby ensuring the rapid discharge of high-temperature air in the transformer room 1 and the effective cooling of the overall environment.

[0023] The circulating air duct 4 is stably and vertically mounted on the designated side of the wall of the transformer room 1, and is composed of multiple air duct sections, each of which is tightly connected by an air duct flange; the circulating air duct 4 connects the air inlet 5 and the heat pump unit to ensure smooth and sealed air circulation. Make sure to determine the installation position of the evaporator 10 in the air duct and mark it, and then install the evaporator 10 in the marked area.

[0024] The air source heat pump system integrates a fan 7 and a refrigerant circulation loop, which sequentially connects an evaporator 10, a compressor 9, a condenser 8 and an expansion valve 13. The compressor 9, the evaporator 10 and the expansion valve 13 are sequentially installed in a vertical air duct from top to bottom, or the compressor 9 is installed outside the transformer room 1. The condenser 8 is placed in the room to be heated as a heating indoor unit. The heat pump system realizes efficient utilization of the heat of high-temperature air and generates low-temperature air through the circulation process of the refrigerant. The low-temperature air is used to cool the transformer 2 body and indoor air in the transformer room 1. The specific process is as follows: the fan 7 introduces the high-temperature air into the evaporator 10, and the refrigerant evaporates from liquid to gas in the evaporator 10. In this process, the heat of the high-temperature air is absorbed to reduce the air temperature; then, the gaseous refrigerant in the evaporator 10 is sucked in by the compressor 9 and compressed into high-temperature and high-pressure gas, and discharged into the condenser 8; in the condenser 8, the refrigerant gas is recondensed into liquid through the heat release process, and the released heat can be processed by the external system to provide heat to the heating room; finally, the liquid refrigerant enters the evaporator 10 again after throttling and reducing the pressure through the expansion valve 13, completing the entire circulation process. This device realizes the effective absorption and transfer of heat from high-temperature air through the circulation of the refrigerant, and continuously outputs low-temperature air.

[0025] The processed low-temperature air is discharged from the air outlet 6 at the lower end of the circulating air duct 4. The air outlet 6 extends to a position close to the lower part of the transformer 2, and a guide vane 16 is installed at the bend, and a fan 7 is installed in front of the air outlet 6 to accelerate the flow of low-temperature air discharged from the evaporator 10, reduce the residence time of the air in the pipeline, and improve the air circulation efficiency.

[0026] At the same time, the fan 7 can make the low-temperature air flow further after being discharged, expand its coverage, and enhance air mobility. A steel mesh structure is also provided at the air outlet 6 to ensure that the air can be discharged evenly and smoothly and prevent foreign matter from entering the unit. The fan 7 can be an axial flow fan, and the specific model of the axial flow fan can be selected according to the actual size of the circulating air duct 4.

[0027] All components work together to form a complete heat recovery process. When the system starts, it automatically inhales, transmits, processes air and releases heat energy to the waste heat utilization device, achieving the dual goals of energy conservation and emission reduction and efficient energy utilization.

[0028] The heat recovery system for the main transformer room of the substation provided by the present invention firmly and vertically installs the circulating air duct 4 on the designated side of the wall of the transformer room 1, which not only ensures the straight and smooth transmission of the airflow, but also greatly optimizes the indoor air flow path, effectively avoids the resistance and space waste caused by the bending of the pipeline, and thus significantly improves the heat dissipation efficiency and heat utilization efficiency of the system. Through the built-in heat pump unit, the ultimate utilization of space resources is achieved. The circulating air duct 4 integrates all key components except the condenser 8, showing a compact and efficient equipment integration design scheme, with a small footprint, which greatly saves the space of the substation. The compressor 9 is placed before the evaporator 10, and its position is in the hot air circulation area. During the adiabatic compression process, the heat generated inside the compressor 9 can be directly and efficiently transferred to the hot air in the air duct, further enhancing the heat recovery and utilization efficiency of the system. Compared with the problems that may exist in the traditional technology, such as unreasonable installation position, poor air flow, and large space occupation, the present invention shows advantages in installation layout and space utilization, which is more conducive to heat dissipation in the transformer room 1.

[0029] In some possible embodiments, see Figure 1 and Figure 3 The evaporator 10 is fixed to the wall of the circulating air duct 4 by means of a connecting bracket; the connecting bracket includes a supporting frame 25 and a mesh plate 29, the supporting frame 25 includes a plurality of horizontally and longitudinally fixedly connected frame rods, and both ends of the supporting frame 25 are connected to the wall of the circulating air duct 4; the evaporator 10 is installed on the supporting frame 25, and a mesh plate 29 is laid between the evaporator 10 and the supporting frame 25.

[0030] In order to facilitate the installation and fixation of the evaporator 10, a connecting bracket is installed at the lower end of the evaporator 10, and the support frame 25 of the connecting bracket is directly connected to the pipe wall of the circulating air duct 4. The support frame 25 is a skeleton structure formed by a plurality of horizontally and vertically staggered fixed racks, which is mainly used to carry the evaporator 10. During installation, the evaporator 10 is first fixed on the support frame 25, and the support frame 25 is installed on the pipe wall.

[0031] The support frame 25 and the evaporator 10 can be fixedly connected by bolts; a mesh plate 29 is laid between the support frame 25 and the evaporator 10, and the mesh plate 29 is a wire mesh structure. The mesh plate 29 can increase the contact area between the support frame 25 and the evaporator 10 while reducing the air flow rate, thereby increasing the contact area and heat exchange time between the air and the evaporator 10.

[0032] In some possible embodiments, see Figure 1 and Figure 2The end of the support frame 25 has a support member, and the support member includes a first fixing member 11 and a second fixing member 12. The first fixing member 11 includes a longitudinal portion and a transverse portion. The longitudinal portion is attached to the pipe wall of the circulating air duct 4, and the transverse portion is vertically connected to the upper end of the longitudinal portion and extends toward a side away from the pipe wall; the second fixing member 12 is a trapezoidal block, and the second fixing member 12 is located at the upper end of the transverse portion. The upper end of the second fixing member 12 has an inclined surface, and the inclined surface is attached to the bottom end of the support frame 25.

[0033] Both ends of the support frame 25 are connected to the pipe wall of the circulating air duct 4 by means of support members, wherein the support member and the pipe wall, and the support member and the support frame 25 are fixedly connected; after simulating and analyzing the air flow and air temperature in the transformer room 1, the installation inclination angle of the evaporator 10 is determined. During installation, the first fixing member 11 is first installed. The first fixing member 11 is fixed to the pipe wall by bolts. The first fixing member 11 is an L-shaped structure composed of a transverse part and a longitudinal part, wherein the longitudinal part is tightly attached to the pipe wall under the action of the bolts, which can further ensure the installation stability of the support member and the evaporator 10; the second fixing member 12 is installed on the upper end face of the transverse part by bolts, and the second fixing member 12 extends upward, and the inclined surface of the top end is used to fit the lower end face of the support frame 25; the selection of the second fixing member 12 needs to be selected according to the installation inclination angle of the evaporator 10. The upper end of the second fixing member 12 is bolted or welded to the support frame 25.

[0034] The appropriate type of evaporator 10 is selected according to the working condition calculation. When a smaller evaporator 10 is selected, all the air in the circulating air duct 4 needs to be cooled by the evaporator 10. Therefore, after the evaporator 10 is installed, the gap between the evaporator 10 and the circulating air duct 4 is filled and sealed with a sealant.

[0035] In some possible embodiments, considering that the heating efficiency of the transformer 2 will continue to increase with aging during use, and the required indoor temperature of the transformer room 1 in winter and summer is different, the heat generated by the transformer 2 will also be different. Therefore, the evaporator 10 is often set to be adjustable. The heat exchange efficiency of the evaporator 10 is changed by adjusting the inclination angle between the evaporator 10 and the axial direction of the circulating air duct 4. When necessary, the evaporator 10 will be stopped to ensure the temperature environment in the transformer room 1, thereby ensuring the normal working requirements of the transformer 2.

[0036] The evaporator 10 achieves the change of the tilt angle with the help of the support frame 25. Specifically, the mesh plate 29 is a rigid plate, and a connecting beam 28 is provided between the mesh plate 29 and the support frame 25. The connecting beam 28 is located below the center line of the mesh plate 29, and the connecting beam 28 is fixedly connected to the rotating shaft 27; a driving structure is installed on the tube wall, and a driving motor 32 is provided in the driving structure. The output end of the driving motor 32 is connected to the rotating shaft 27 to drive the rotating shaft 27 to drive the evaporator 10 to rotate longitudinally; a limiting groove 24 is provided on the driving structure, and a limiting roller is provided at the end of the support frame 25. The limiting roller cooperates with the limiting groove 24 to limit the rotation angle of the rotating shaft 27.

[0037] The connecting beam 28 separates the mesh plate 29 from the support frame 25, reduces the contact area between the mesh plate 29 and the support frame 25, and thus reduces the influence of the support frame 25 on the air flow. The mesh plate 29 can be made of a steel mesh or a metal punching plate. In order to increase the connection strength between the mesh plate 29 and the support frame 25, a plurality of auxiliary beams 26 are provided on both sides of the connecting beam 28. The auxiliary beams 26 are parallel to the connecting beam 28, but are shorter than the connecting beam 28.

[0038] Both ends of the rotating shaft 27 are rotatably mounted on the driving structure and connected to the output end of the driving motor 32. The rotation and resetting of the evaporator 10 can be achieved by the forward and reverse rotation of the driving motor 32. Then, the heat exchange efficiency can be changed by adjusting the angle of the evaporator 10 according to the air temperature in the transformer room 1 and the air temperature in the circulating air duct 4.

[0039] The limiting groove 24 provided on the driving structure enables the limiting roller at the end of the support frame 25 to cooperate with the rotating shaft 27 to rotate and limit the rotation angle of the rotating shaft 27. The limiting groove 24 is an arc groove, and the central angle corresponding to the limiting groove 24 does not exceed the maximum angle that the evaporator 10 can rotate.

[0040] like Figure 5 and Figure 6 As shown, the driving structure includes a driving box 31, which is fixedly mounted on the pipe wall. The inner cavity of the driving box 31 is used to install a driving motor 32 and a linkage assembly. The rotating shaft 27 passes through the side plate of the driving box 31 and cooperates with the side plate of the driving box 31 by means of a bearing; the linkage assembly includes a driving gear 33 and a driven gear 34. The driving gear 33 is sleeved on the output shaft of the driving motor 32, and the driven gear 34 is sleeved on the shaft section of the rotating shaft 27 extending into the inner cavity of the driving box 31; the driving gear 33 and the driven gear 34 are meshed. The driving box 31 is bolted to the pipe wall, and the outer side of the driving box 31 has an adapter plate 30. The rotating shaft 27 passes through the adapter plate 30 and the side plate of the driving box 31 in sequence, extends into the driving box 31, and is connected with the linkage assembly in the driving box 31. The limiting groove 24 is provided on the adapter plate 30 on the outer side of the driving box 31.

[0041] The driving motor 32 is installed in the driving box 31, and the output end of the driving motor 32 is located on one side of the rotating shaft 27 and is parallel to the rotating shaft 27; the driving gear 33 is sleeved on the output shaft of the driving motor 32. The driving gear 33 includes a smooth portion and a tooth portion, and the tooth portion is meshed with the driven gear 34; the central angle of the tooth portion is not less than 90°, and the rotation angle of the driven gear 34 is not more than 75°. Correspondingly, the limiting groove 24 is an arc groove, and the central angle of the limiting groove 24 is consistent with the maximum rotation angle of the driven gear 34.

[0042] In some possible embodiments, see Figure 6 In order to adapt to the angle adjustment of the evaporator 10, a first flexible pipe section is provided between the evaporator 10 and the compressor 9, and a second flexible pipe section is provided between the evaporator 10 and the expansion valve 13. The first flexible pipe section and the second flexible pipe section are respectively located above and below the evaporator 10, and the first flexible pipe section and the second flexible pipe section are both limited by a fixed structure installed on the pipe wall of the circulating air duct 4; the fixed structure includes a fixed shaft 35, a rotating sleeve 36 and a torsion spring 37, the fixed shaft 35 is fixed on the pipe wall, and both ends of the fixed shaft 35 have limiting baffles, the torsion spring 37 and the rotating sleeve 36 are sequentially sleeved on the outside of the fixed shaft 35, one end of the torsion spring 37 is connected to the fixed shaft 35, and the other end of the torsion spring 37 is connected to the rotating sleeve 36; the first flexible pipe section / the second flexible pipe section is wound around the outside of the rotating sleeve 36.

[0043] The first flexible pipe section and the second flexible pipe section are both tensioned by means of the torsion spring 37, and the excess part is wound around the rotating sleeve 36. When the tilt angle of the evaporator 10 needs to be adjusted, the length of the first flexible pipe section / the second flexible pipe section is changed by pulling, so as to avoid the excess pipe section from winding in the circulating air duct 4 and affecting the use of the system, further ensuring the stability of the system operation, and realizing system integration at the same time, reducing the space occupied by the pipe section in the circulating air duct 4.

[0044] In some possible embodiments, see Figure 4 The circulating air duct 4 includes an air inlet section 19, an air outlet section 23 and a heat recovery section; the heat recovery section includes a plurality of Class A air ducts 20, a plurality of Class B air ducts 22 and a heat recovery air duct 21, the plurality of Class A air ducts 20 are arranged in parallel, the inlet ends of the plurality of Class A air ducts 20 are connected to the air inlet section 19, and the outlet ends are connected to the heat recovery air duct 21, the evaporator 10 is installed in the heat recovery air duct 21, and the heat recovery air duct 21 is connected to the air outlet section 23; a plurality of Class B air ducts 22 are arranged in parallel, the inlet ends of the plurality of Class B air ducts 22 are connected to the air inlet section 19, and the outlet ends are connected to the air outlet section 23; both the Class A air ducts 20 and the Class B air ducts 22 are provided with opening and closing valves.

[0045] The air inlet section 19 and the air outlet section 23 of the circulating air duct 4 are set as an integral section, and the heat recovery section in the middle of the circulating air duct 4 is divided into a plurality of parallel pipe sections; the above-mentioned parallel pipe sections are divided into a plurality of Class I air ducts 20 and a plurality of Class II air ducts 22, wherein the Class I air duct 20 is used to connect the heat recovery air duct 21, and the air in the Class I air duct 20 enters the heat recovery air duct 21 for heat exchange and then enters the air outlet section 23; the Class II pipe section is directly connected to the air outlet section 23; the air in the Class I air duct 20 and the air in the Class II air duct 22 are mixed in the air outlet section 23 and then discharged.

[0046] Temperature sensing components are installed in the first-class air duct 20, the second-class air duct 22, the air outlet section 23, and the transformer room 1. The opening and closing valves on the first-class air duct 20 and the second-class air duct 22 are used to control the air flow of the first-class air duct 20 and the second-class air duct 22, thereby adjusting the air temperature of the air outlet 6.

[0047] There are multiple fans 7, and the multiple fans 7 are correspondingly installed in a Class I air duct 20 / Class II air duct 22. The Class I air duct 20 / Class II air duct 22 is provided with an injection pipe section 15. The injection pipe section 15 in the same Class I air duct 20 / Class II air duct 22 is located at the front side or the rear side of the fan 7, and the injection pipe section 15 includes a tapered section and a gradually expanding section connected in sequence.

[0048] When the blower 7 is running, the ejection pipe section 15 is inside the first type air duct 20 / second type air duct 22, and the air is passively passed through the ejection pipe section 15, forming a negative pressure area at the outlet end of the ejection pipe section 15. The negative pressure area creates a suction force inside the first type air duct 20 / second type air duct 22, which increases the air flow effect and ensures the pressure stability at its outlet end.

[0049] The arrangement of the injection pipe section 15 can reduce energy consumption, relieve the pressure on the fan 7, and even replace the fan 7 at the air outlet 6 end and the fan 7 at the air inlet 5 end after a negative pressure state is formed, thereby reducing the energy consumption of the fan 7.

[0050] In some possible embodiments, see Figure 3 A ventilation base 17 is also provided around the mounting base 3, and the air outlet 6 is located in the space between the ventilation base 17 and the floor; the ventilation base 17 includes a perforated plate area 18 that allows air circulation, and the perforated plate area 18 is arranged around the mounting base 3; the air inlet 5 extends to the top of the transformer 2, and a mesh cover plate 14 is installed at the air inlet 5.

[0051] The ventilation base 17 is arranged around the installation base 3 and is spaced from the floor, a buffer space is formed between the ventilation base 17 and the floor, and the air outlet 6 extends into the buffer space. The orifice plate area 18 of the ventilation base 17 is made by punching holes on a steel plate.

[0052] The provision of the ventilation foundation 17 improves the distribution of the airflow, so that the airflow is buffered in the buffer space and then flows toward the transformer 2 through the orifice plate area 18 .

[0053] The air inlet 5 of the internal circulation system extends to the top of the transformer 2, and the mesh cover plate 14 installed at the air inlet 5 covers the entire transformer 2. The mesh cover plate 14 allows airflow to enter the air inlet 5 from the area above it, so that the high-temperature gas on one side of the transformer 2 enters the air inlet 5 at a high speed, while the higher-temperature gas on the top of the transformer chamber 1 above the mesh cover plate 14 enters the air inlet 5 at a low speed, which is more conducive to the uniform distribution of the temperature gradient in the transformer chamber 1.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Heat recovery system for main transformer room of substation, characterized by: It includes a transformer room, an internal circulation system and a heat pump system; the transformer room is provided with an installation foundation for carrying a transformer; the internal circulation system includes a circulation air duct, the air inlet of the circulation air duct is located at the upper part of the transformer room, the air outlet of the circulation air duct is located at one side of the installation foundation, the air outlet is lower than the upper end surface of the installation foundation, and the circulation air duct is provided with a fan; the heat pump system includes an evaporator, a compressor, a condenser and an expansion valve, the evaporator and the expansion valve are longitudinally installed in the circulation air duct downstream of the fan in sequence, the condenser is located outside the transformer room, one end of the condenser is connected to the evaporator by means of the compressor, and the other end of the condenser is connected to the expansion valve; the evaporator is arranged at an angle to the axial direction of the circulation air duct.

2. The heat recovery system for the main transformer room of a substation according to claim 1, characterized in that: The evaporator is fixed to the pipe wall of the circulating air duct by means of a connecting bracket; the connecting bracket includes a supporting frame and a mesh plate, the supporting frame includes a plurality of frame rods fixedly connected transversely and longitudinally, and the two ends of the supporting frame are connected to the pipe wall of the circulating air duct; the evaporator is installed on the supporting frame, and the mesh plate is laid between the evaporator and the supporting frame.

3. The heat recovery system for the main transformer room of a substation according to claim 2, characterized in that: The end of the support frame has a support member, and the support member includes a first fixing member and a second fixing member, the first fixing member includes a longitudinal portion and a transverse portion, the longitudinal portion is attached to the pipe wall of the circulating air duct, and the transverse portion is vertically connected to the upper end of the longitudinal portion and extends toward a side away from the pipe wall; the second fixing member is a trapezoidal block, the second fixing member is located at the upper end of the transverse portion, and the upper end of the second fixing member has an inclined surface, and the inclined surface is attached to the bottom end of the support frame.

4. The heat recovery system for the main transformer room of a substation according to claim 2, characterized in that: The mesh plate is a rigid plate, and a connecting beam is provided between the mesh plate and the support frame, the connecting beam is located below the center line of the mesh plate, and the connecting beam is fixedly connected to a rotating shaft; a driving structure is installed on the tube wall, and a driving motor is provided in the driving structure, and an output end of the driving motor is connected to the rotating shaft to drive the rotating shaft to drive the evaporator to rotate longitudinally; a limiting groove is provided on the driving structure, and a limiting roller is provided at the end of the support frame, and the limiting roller cooperates with the limiting groove to limit the rotation angle of the rotating shaft.

5. The heat recovery system for the main transformer room of a substation according to claim 4, characterized in that: The driving structure includes a driving box, which is fixedly mounted on the tube wall. The inner cavity of the driving box is used to install the driving motor and the linkage assembly. The rotating shaft passes through the side plate of the driving box and cooperates with the side plate of the driving box by means of bearings. The linkage assembly includes a driving gear and a driven gear. The driving gear is sleeved on the output shaft of the driving motor, and the driven gear is sleeved on the shaft section of the rotating shaft extending into the inner cavity of the driving box. The driving gear and the driven gear are meshed.

6. The heat recovery system for the main transformer room of a substation according to claim 5, characterized in that: The driving gear includes a smooth portion and a tooth portion, and the tooth portion is meshed with the driven gear; the central angle occupied by the tooth portion is not less than 90°, and the rotation angle of the driven gear is not greater than 75°. Correspondingly, the limiting groove is an arc groove, and the central angle of the limiting groove is consistent with the maximum rotation angle of the driven gear.

7. The heat recovery system for the main transformer room of a substation according to claim 1, characterized in that: A first flexible pipe section is provided between the evaporator and the compressor, and a second flexible pipe section is provided between the evaporator and the expansion valve. The first flexible pipe section and the second flexible pipe section are respectively located above and below the evaporator. The first flexible pipe section and the second flexible pipe section are both limited by a fixed structure installed on the pipe wall of the circulating air duct; the fixed structure comprises a fixed shaft, a rotating sleeve and a torsion spring, the fixed shaft is fixed on the pipe wall, and both ends of the fixed shaft have limiting baffles, the torsion spring and the rotating sleeve are sequentially sleeved on the outside of the fixed shaft, one end of the torsion spring is connected to the fixed shaft, and the other end of the torsion spring is connected to the rotating sleeve; the first flexible pipe section / the second flexible pipe section are wound around the outside of the rotating sleeve.

8. The heat recovery system for the main transformer room of a substation according to claim 1, characterized in that: The circulating air duct includes an air inlet section, an air outlet section and a heat recovery section; the heat recovery section includes a plurality of Class I air ducts, a plurality of Class II air ducts and a heat recovery air duct, the plurality of Class I air ducts are arranged in parallel, the inlet ends of the plurality of Class I air ducts are connected to the air inlet section, and the outlet ends are connected to the heat recovery air duct, the evaporator is installed in the heat recovery air duct, and the heat recovery air duct is connected to the air outlet section; the plurality of Class II air ducts are arranged in parallel, the inlet ends of the plurality of Class II air ducts are connected to the air inlet section, and the outlet ends are connected to the air outlet section; both the Class I air duct and the Class II air duct are provided with opening and closing valves.

9. The heat recovery system for the main transformer room of a substation according to claim 8, characterized in that: There are multiple fans, and the multiple fans are correspondingly installed in the first type of air duct / the second type of air duct. The first type of air duct / the second type of air duct is provided with an injection pipe section. The injection pipe section in the same first type of air duct / the second type of air duct is located at the front side or the rear side of the fan, and the injection pipe section includes a tapered section and a gradually expanding section connected in sequence.

10. The heat recovery system for the main transformer room of a substation according to claim 1, characterized in that: A ventilation base is also provided around the installation base, and the air outlet is located in the space between the ventilation base and the floor; the ventilation base includes a perforated plate area that allows air circulation, and the perforated plate area is surrounded by the installation base; the air inlet extends to the top of the transformer, and a mesh cover plate is installed at the air inlet.

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