Heat recovery system for main transformer room of substation

Abstract

The present invention provides a heat recovery system for a main transformer room of a substation, belonging to the technical field of substations, and comprising a transformer room, an internal circulation system, and a heat pump system; the transformer room is provided with an installation foundation; the internal circulation system comprises a circulating air duct, the air inlet of the circulating air duct being located at the upper part of the transformer room, the air outlet being lower than the upper end surface of the installation foundation, and the circulating air duct being provided with a fan; the heat pump system comprises an evaporator, a compressor, a condenser, and an expansion valve, the evaporator and the expansion valve being longitudinally installed in sequence in the circulating air duct downstream of the fan, the evaporator being arranged at an angle to the axial direction of the circulating air duct. In the heat recovery system for the main transformer room of a 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 the evaporator located in the circulating air duct effectively captures and converts the waste heat resources released during the operation of the transformer; the evaporator being arranged at an angle to the axial direction of the circulating air duct can increase the contact area between the evaporator and the air in the circulating air duct.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformer substations, and more particularly, 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 power transmission and distribution networks, have become key areas of technological innovation, with operational stability and energy efficiency optimization becoming key areas of focus. Transformers, the core equipment for energy conversion within substations, inevitably generate significant amounts of heat during operation, impacting their efficiency and service life. If this heat is not utilized and is directly discharged into the environment, it wastes energy and can cause thermal pollution.

[0003] To reduce noise nuisance, transformer and reactor rooms are currently enclosed in a closed design without ventilation windows or exhaust fans. During high temperature and high load seasons, the temperature in the transformer and reactor rooms can reach over 60°C. Although current equipment can operate at temperatures above 80°C, the auxiliary devices and measuring devices in the transformer / reactor room suffer from unstable operation, 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 supporting the 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 on 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 horizontally and longitudinally, and the two 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 the 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 pipe 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 with the help 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 engaged 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-shaped 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. 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 a limiting baffle, 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 A air ducts, multiple Class B air ducts and a heat recovery air duct, multiple Class A air ducts are arranged in parallel, the inlet ends of multiple Class A 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 B air ducts are arranged in parallel, the inlet ends of multiple Class B air ducts are connected to the air inlet section, and the outlet ends are connected to the air outlet section; both the Class A air duct and the Class B air duct 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-class air duct / the second-class air duct. The first-class air duct / the second-class air duct are each provided with an injection pipe section. The injection pipe section in the same first-class air duct / the second-class 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 further provided around the mounting 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 arranged around the mounting 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 a substation provided by the present invention are as follows: compared with the prior art, in the heat recovery system for the main transformer room of a 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 for efficient utilization 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 axis 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any 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;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 A schematic structural diagram of a heat recovery system for a main transformer room of a substation provided by a second embodiment of the present invention;

[0020] Figure 4 A schematic structural diagram of a heat recovery section provided in a second embodiment of the present invention;

[0021] Figure 5 A schematic structural diagram of a connecting bracket provided in a third embodiment of the present invention;

[0022] Figure 6 A schematic structural diagram of a driving structure provided in a third embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the connection between the driving gear and the driven gear provided in the third embodiment of the present invention.

[0024] 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. Class I air duct; 21. Heat recovery air duct; 22. Class II 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

[0025] 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 with reference to 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.

[0026] See also Figures 1 to 7 The heat recovery system for the main transformer room of a substation provided by the present invention is now described. The heat recovery system for the main transformer room of a substation includes a transformer room 1, an internal circulation system, and a heat pump system. The transformer room 1 is provided with a mounting base 3 for supporting 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, and the air outlet 6 is lower than the upper end surface of the mounting base 3. The circulating air duct 4 is provided with 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 sequence in the circulating air duct 4 downstream of the fan 7. 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.

[0027] The heat recovery system for the main transformer room of the transformer substation provided by the present invention is compared with the prior art. 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 to increase the contact area between the evaporator 10 and the air in the circulating air duct 4, and the flow time and heat exchange effect of the air are increased by changing the flow direction of the air after entering the evaporator 10.

[0028] The air inlet 5 is located at the top of the transformer chamber 1, where the hot air naturally rises. The air inlet 5 is equipped with an air inlet device that integrates a wire mesh and guide vane 16 system. As the first line of defense, the wire mesh's precise mesh not only blocks dust and particles from the air, ensuring the cleanliness of the internal system and the stability of equipment operation, but also reduces maintenance costs. The guide vanes 16 that follow guide this naturally rising hot air, allowing it to enter 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 hot air from the transformer chamber 1 and the effective cooling of the entire environment.

[0029] The circulating air duct 4 is securely mounted vertically on a designated side of the transformer room 1 wall. It consists of multiple duct sections, each tightly connected by duct flanges. The circulating air duct 4 connects the air inlet 5 and the heat pump unit, ensuring smooth and airtight air circulation. Ensure the evaporator 10's installation position within the duct is determined and marked, then install the evaporator 10 in the marked area.

[0030] The air-source heat pump system integrates a fan 7 with a refrigerant circulation loop, which sequentially connects an evaporator 10, a compressor 9, a condenser 8, and an expansion valve 13. The compressor 9, evaporator 10, and expansion valve 13 are installed in a vertical air duct from top to bottom, or the compressor 9 is installed outside the transformer room 1. The condenser 8, serving as the indoor heating unit, is placed in the room to be heated. The heat pump system achieves efficient utilization of the heat of high-temperature air and produces low-temperature air through the circulation of refrigerant. This low-temperature air is used to cool the transformer 2 and the indoor air in transformer room 1. The specific process is as follows: fan 7 introduces high-temperature air into evaporator 10, where the refrigerant evaporates from liquid to gas, absorbing heat from the high-temperature air and lowering the air temperature. Subsequently, the gaseous refrigerant in evaporator 10 is sucked into compressor 9 and compressed into high-temperature, high-pressure gas, which is discharged into condenser 8. In condenser 8, the refrigerant gas condenses back into liquid through a heat release process. The released heat can be processed by an external system to provide heat to the heated room. Finally, the liquid refrigerant passes through expansion valve 13, throttling and reducing the pressure, and then re-enters evaporator 10, completing the entire cycle. This device achieves effective absorption and transfer of heat from high-temperature air through the circulation of refrigerant, while continuously outputting low-temperature air.

[0031] The treated 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 near the bottom of the transformer 2. A guide vane 16 is installed at the bend of the air outlet 6. A fan 7 is installed in front of the air outlet 6 to accelerate the flow of the low-temperature air discharged from the evaporator 10, reduce the air's residence time in the duct, and improve air circulation efficiency.

[0032] At the same time, fan 7 allows the low-temperature air to flow further after discharge, expanding its coverage and enhancing air flow. A wire mesh structure is also installed at the air outlet 6 to ensure uniform and smooth air discharge and prevent foreign matter from entering the unit. Fan 7 can be an axial flow fan, and the specific model of the axial flow fan can be selected based on the actual size of the circulation air duct 4.

[0033] 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.

[0034] The heat recovery system for the main transformer room of a substation provided by the present invention securely and vertically mounts the circulating air duct 4 on a designated side of the wall of the transformer room 1, which not only ensures the straight and smooth transmission of airflow, but also greatly optimizes the indoor air flow path, effectively avoiding the resistance and space waste caused by pipe bends, thereby significantly improving the system's heat dissipation efficiency and heat utilization efficiency. By using a 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, presenting a compact and efficient equipment integration design solution with a small footprint, which greatly saves substation space. 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 system's heat recovery and utilization efficiency. Compared with the problems that may exist in traditional technologies, such as unreasonable installation position, poor air flow, and large space occupation, the present invention demonstrates advantages in installation layout and space utilization, which is more conducive to heat dissipation in the transformer room 1.

[0035] In some possible embodiments, see Figure 1 and Figure 3 The evaporator 10 is fixed to the wall of the circulating air duct 4 with the help of a connecting bracket; the connecting bracket includes a support frame 25 and a mesh plate 29, the support frame 25 includes a plurality of horizontal and vertical fixedly connected frame rods, and the two ends of the support frame 25 are connected to the wall of the circulating air duct 4; the evaporator 10 is installed on the support frame 25, and a mesh plate 29 is laid between the evaporator 10 and the support frame 25.

[0036] To facilitate installation and securing of the evaporator 10, a connecting bracket is mounted at the lower end of the evaporator 10. The supporting frame 25 of the connecting bracket is directly connected to the wall of the circulating air duct 4. The supporting frame 25 is a skeleton structure formed by multiple horizontal and vertical staggered rods. It is primarily used to support the evaporator 10. During installation, the evaporator 10 is first secured to the supporting frame 25, which is then mounted on the duct wall.

[0037] 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. The mesh plate 29 is a steel mesh structure. The mesh plate 29 increases the contact area between the support frame 25 and the evaporator 10 while also reducing the air flow rate, thereby increasing the contact area and heat exchange time between the air and the evaporator 10.

[0038] In some possible embodiments, see Figure 1 and Figure 2The end of the support frame 25 has a support member, which 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, which is in contact with the bottom end of the support frame 25.

[0039] Both ends of the support frame 25 are connected to the wall of the circulating air duct 4 via support members, with the support member and the wall, as well as the support member and the support frame 25, being fixedly connected. After simulating and analyzing the air flow and air temperature within the transformer chamber 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 bolted to the wall of the duct. The first fixing member 11 is an L-shaped structure consisting of a transverse portion and a longitudinal portion. The longitudinal portion is bolted to the wall of the duct, further ensuring the installation stability of the support member and evaporator 10. The second fixing member 12 is bolted to the upper end surface of the transverse portion. The second fixing member 12 extends upward, and the inclined surface at its top is designed to mate with the lower end surface of the support frame 25. The selection of the second fixing member 12 should be based on 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.

[0040] An appropriate model of evaporator 10 is selected based on the working condition calculation. If 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 sealant.

[0041] In some possible embodiments, taking into account that the heating efficiency of the transformer 2 will continue to increase as it ages during use, and that the required indoor temperatures of the transformer room 1 in winter and summer are 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 operation requirements of the transformer 2.

[0042] The evaporator 10 achieves a change in tilt angle with the aid of the support frame 25. Specifically, the mesh plate 29 is a rigid plate, with a connecting beam 28 between the mesh plate 29 and the support frame 25. The connecting beam 28 is located below the centerline of the mesh plate 29 and is fixedly connected to the rotating shaft 27. A drive structure is mounted on the tube wall, which contains a drive motor 32. The output end of the drive motor 32 is connected to the rotating shaft 27 to drive the rotating shaft 27 to drive the evaporator 10 in longitudinal rotation. The drive structure is provided with a limiting slot 24, and the end of the support frame 25 has a limiting roller. The limiting roller cooperates with the limiting slot 24 to limit the rotation angle of the rotating shaft 27.

[0043] Connecting beams 28 separate the mesh plate 29 from the support frame 25, reducing the contact area between them and thereby minimizing the impact of air flow on the support frame 25. The mesh plate 29 can be made of steel mesh or perforated metal. To strengthen the connection between the mesh plate 29 and the support frame 25, several auxiliary beams 26 are installed on both sides of the connecting beam 28. The auxiliary beams 26 are parallel to the connecting beam 28 but shorter than the connecting beam 28.

[0044] The two ends of the rotating shaft 27 are rotatably mounted on the drive structure and connected to the output end of the drive motor 32. The rotation and resetting of the evaporator 10 can be achieved by the forward and reverse rotation of the drive 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.

[0045] The limiting groove 24 provided on the drive structure enables the limiting roller at the end of the support frame 25 to cooperate with the rotating shaft 27 to rotate and limits the rotation angle of the rotating shaft 27. The limiting groove 24 is an arc-shaped groove, and the central angle corresponding to the limiting groove 24 does not exceed the maximum rotation angle of the evaporator 10.

[0046] like Figure 5 and Figure 6 As shown, the drive structure includes a drive box 31, which is fixedly mounted to the pipe wall. The inner cavity of the drive box 31 is used to mount a drive motor 32 and a linkage assembly. The rotating shaft 27 extends through the side panels of the drive box 31 and engages with the side panels of the drive box 31 via bearings. The linkage assembly includes a drive gear 33 and a driven gear 34. The drive gear 33 is mounted on the output shaft of the drive motor 32, and the driven gear 34 is mounted on the shaft section of the rotating shaft 27 that extends into the inner cavity of the drive box 31. The drive gear 33 and the driven gear 34 mesh with each other. The drive box 31 is bolted to the pipe wall. The outer side of the drive box 31 has an adapter plate 30. The rotating shaft 27 extends through the adapter plate 30 and the side panels of the drive box 31, extending into the drive box 31 and connecting with the linkage assembly inside the drive box 31. The limit slot 24 is provided on the adapter plate 30 on the outer side of the drive box 31.

[0047] The drive motor 32 is mounted within the drive housing 31 , with its output end located on one side of and parallel to the rotating shaft 27 . A drive gear 33 is sleeved onto the output shaft of the drive motor 32 . The drive gear 33 includes a smooth portion and a toothed portion, which meshes with a driven gear 34 . The toothed portion has a central angle of no less than 90°, and the rotation angle of the driven gear 34 is no greater than 75°. Accordingly, the limiting groove 24 is an arc-shaped groove, and its central angle coincides with the maximum rotation angle of the driven gear 34 .

[0048] 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. 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. 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 are wound around the outside of the rotating sleeve 36.

[0049] The first and second flexible pipe sections are both tensioned by torsion springs 37, with the excess section wrapped around rotating sleeve 36. When the tilt angle of evaporator 10 needs to be adjusted, the lengths of the first and second flexible pipe sections are adjusted by pulling, preventing excess pipe sections from becoming entangled in the circulating air duct 4 and affecting system operation. This further ensures system stability, enables system integration, and reduces the space occupied by the pipe sections within the circulating air duct 4.

[0050] 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 multiple Class A air ducts 20, multiple Class B air ducts 22 and a heat recovery air duct 21. The multiple Class A air ducts 20 are arranged in parallel, and the inlet ends of the multiple 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; multiple Class B air ducts 22 are arranged in parallel, and the inlet ends of the multiple 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.

[0051] 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 multiple parallel pipe sections; the above-mentioned parallel pipe sections are divided into multiple Class A air ducts 20 and multiple Class B air ducts 22, among which the Class A air duct 20 is used to connect to the heat recovery air duct 21, and the air in the Class A air duct 20 enters the heat recovery air duct 21 for heat exchange and then enters the air outlet section 23; the Class B pipe section is directly connected to the air outlet section 23; the air in the Class A air duct 20 and the air in the Class B air duct 22 are mixed in the air outlet section 23 and then discharged.

[0052] Temperature sensing components are installed in the Class I air duct 20, Class II air duct 22, air outlet section 23, and transformer chamber 1. The on / off valves on the Class I air duct 20 and Class II air duct 22 are used to control the air flow in the Class I air duct 20 and Class II air duct 22, thereby adjusting the air temperature at the air outlet 6.

[0053] There are multiple fans 7, and the multiple fans 7 are correspondingly installed in the Class I air duct 20 / Class II air duct 22. The Class I air duct 20 / Class II air duct 22 is equipped 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 in the front side or rear side of the fan 7. The injection pipe section 15 includes a tapered section and a gradually expanding section connected in sequence.

[0054] When the blower 7 is running, the ejection pipe section 15 is located within the first-class air duct 20 or the second-class air duct 22. As air passively passes through the ejection pipe section 15, a negative pressure region is formed at the outlet of the ejection pipe section 15. This negative pressure region creates a suction force within the first-class air duct 20 or the second-class air duct 22, which increases air flow and ensures stable pressure at the outlet.

[0055] The arrangement of the injection pipe section 15 can reduce energy consumption, relieve the pressure of 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.

[0056] 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.

[0057] The ventilation base 17 is arranged around the installation base 3 and is spaced apart 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 in a steel plate.

[0058] The provision of the ventilation base 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 area 18 .

[0059] The air inlet 5 of the internal circulation system extends above the transformer 2, and a mesh cover 14 installed at the air inlet 5 covers the entire transformer 2. The mesh cover 14 allows airflow to enter the air inlet 5 from the area above it, allowing high-temperature air on the side of the transformer 2 to enter the air inlet 5 at high speed, while the even higher-temperature air at the top of the transformer chamber 1, above the mesh cover 14, enters the air inlet 5 at low speed, which is more conducive to a more uniform temperature gradient distribution within the transformer chamber 1.

[0060] 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 scope of protection of the present invention.

Claims

1. The heat recovery system of the main transformer room of the substation is characterized by: The heat pump system comprises a transformer room, an internal circulation system and a heat pump system; the transformer room is provided with an installation foundation for carrying the transformer; the internal circulation system comprises 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 comprises 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; The evaporator is fixed to the 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 horizontally and longitudinally fixedly connected rack rods, and both ends of the support frame are connected to the 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; 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 perpendicularly 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; 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 the 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.

2. The heat recovery system for the main transformer room of a substation according to claim 1, characterized in that: The driving structure includes a driving box, which is fixedly mounted on the pipe 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.

3. The heat recovery system for the main transformer room of a substation according to claim 2, characterized in that: The driving gear includes a smooth portion and a tooth portion, and the tooth portion is engaged 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-shaped groove, and the central angle of the limiting groove is consistent with the maximum rotation angle of the driven gear.

4. 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 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 a limiting baffle, 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.

5. 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 multiple Class A air ducts, multiple Class B air ducts and a heat recovery air duct, multiple Class A air ducts are arranged in parallel, the inlet ends of multiple Class A 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 B air ducts are arranged in parallel, the inlet ends of multiple Class B air ducts are connected to the air inlet section, and the outlet ends are connected to the air outlet section; both the Class A air duct and the Class B air duct are provided with opening and closing valves.

6. The heat recovery system for the main transformer room of a substation according to claim 5, characterized in that: There are multiple fans, and the multiple fans are correspondingly installed in the first-class air duct / the second-class air duct. The first-class air duct / the second-class air duct is provided with an injection pipe section. The injection pipe section in the same first-class air duct / the second-class 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.

7. 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 mounting 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 arranged around the mounting base; the air inlet extends to above the transformer, and a mesh cover plate is installed at the air inlet.

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