Forced oil circulation water cooler of transformer

Abstract

The invention relates to the technical field of coolers, in particular to a forced oil circulation water cooler of a transformer, which comprises a heat exchange shell and a tube box, the heat exchange shell is connected with the tube box through a flange, a first tube plate is fixedly connected to the joint of the heat exchange shell and the tube box, a plurality of heat exchange tubes are mounted on the surface of the first tube plate in a penetrating manner, and the heat exchange tubes penetrate through the surface of the first tube plate. The heat exchange pipe is located in the heat exchange shell, a horizontally-arranged partition plate is fixedly connected to the middle of the pipe box, a feeding pipe and a discharging pipe are fixedly connected to the top and the bottom of the pipe box respectively, a water outlet pipe and a water inlet pipe are fixedly connected to the top and the bottom of the heat exchange shell respectively, and the water outlet pipe and the water inlet pipe are distributed at the two ends of the heat exchange shell. By means of the arrangement, it is guaranteed that backflow insulating oil is kept in a clean state, normal use of the transformer is not affected, only part of the insulating oil is lost even if it is found that leakage time is late, and normal work of the transformer is still not affected.

Description

Technical Field

[0001] This invention relates to the field of cooler technology, and in particular to a forced oil-circulating water cooler for a transformer. Background Technology

[0002] Oil-immersed transformers are a common type of power transformer. Their internal windings and core are completely immersed in insulating oil to achieve insulation, heat dissipation, and protection functions. During high-temperature and high-load operation, the temperature of the upper oil layer of the transformer may approach or exceed the allowable value specified in the regulations. At this time, the transformer's own heat dissipation method may not be able to meet the heat dissipation requirements, and external auxiliary cooling measures are required.

[0003] External auxiliary cooling measures include drawing the insulating oil outward and cooling it in a water cooler before circulating it back into the transformer. This can effectively reduce the temperature of the insulating oil and provide rapid cooling for the transformer.

[0004] Leakage is a common problem in traditional transformer water cooling systems. The main causes include, but are not limited to: differences in temperature between hot and cold fluids; temperature differences between the casing and pipe walls leading to different thermal expansions; excessive temperature differences causing damage to the pipes and resulting in leaks; thinning and perforation of the pipe outer wall due to the two-phase flow of steam and water, leading to leaks; water contamination in the transformer insulating oil significantly reduces its breakdown voltage, and under the influence of an electric field, a conductive path can form between the electrodes, easily causing transformer breakdown; water also inevitably corrodes and damages internal components. Therefore, water cooling equipment used in transformers must ensure that cooling water does not enter the insulating oil, which is difficult to achieve with traditional water cooling systems. Furthermore, when one cooling pipe in the cooler fails, it becomes unusable, making it difficult to handle sudden external cooling events. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that coolant will enter the insulating oil when leakage occurs in the prior art, thereby providing a forced oil circulation water cooler for transformers.

[0006] To solve the above-mentioned technical problems, the present invention provides a forced oil-circulating water cooler for a transformer, comprising a heat exchange shell and a tube box, wherein the heat exchange shell and the tube box are connected by a flange, a tube sheet is fixedly connected at the connection between the heat exchange shell and the tube box, and multiple heat exchange tubes are installed through the surface of the tube sheet, the heat exchange tubes being located in the heat exchange shell, a horizontally arranged partition is fixedly connected to the middle of the tube box, an inlet pipe and an outlet pipe are fixedly connected to the top and bottom of the tube box respectively, and a water outlet pipe and a water inlet pipe are fixedly connected to the top and bottom of the heat exchange shell respectively, the water outlet pipe and the water inlet pipe being distributed at both ends of the heat exchange shell, characterized in that: multiple pressure gauges are provided on the outside of the heat exchange shell, the multiple pressure gauges are respectively connected to multiple heat exchange tubes, a pressure regulating valve is installed at the bottom of the outlet pipe, and a detection box for detecting cooling water is connected to the outside of the outlet pipe;

[0007] By setting up a detection box and a pressure regulating valve, the transformer insulating oil is injected into the upper part of the tube box through the feed pipe. After passing through multiple heat exchange tubes, it reaches the lower part of the tube box. Cooling water is injected into the heat exchange shell from the bottom through the water inlet pipe, and the cooled water is continuously discharged from the upper outlet pipe, thus exchanging heat with the insulating oil. The pressure regulating valve is installed at the bottom of the discharge pipe, which increases the pressure of the insulating oil injected into the feed pipe. Combined with the setting of the pressure regulating valve, the pressure of the insulating oil in the tube box and heat exchange tubes is maintained at a high pressure, which needs to be much higher than the cooling water pressure in the heat exchange shell. The pressure gauge monitors the oil pressure in all heat exchange tubes in real time, and also represents the oil pressure in the tube box. The pressure gauge can remotely transmit the detected values ​​to the monitoring terminal for analysis. When leakage occurs, the pressure drops. Because the oil pressure is much higher than the water pressure, only... Some insulating oil enters the cooling water, but the cooling water does not flow back into the insulating oil. Although a leak occurs, it only results in a small loss of insulating oil and does not cause the returned insulating oil to be mixed with cooling water. Therefore, the returned insulating oil can still enter the transformer for normal heat exchange. At this time, the inlet and outlet pipes can be sealed to ensure that the returned insulating oil remains clean and will not affect the normal operation of the transformer. Even if the leak is detected late, only a portion of the insulating oil will be lost, and it will still not affect the normal operation of the transformer. The detection box is used to receive the cooling water flowing out of the heat exchange shell and detect whether the cooling water contains insulating oil. This, together with the pressure gauge, achieves a dual detection function, ensuring a rapid response in the event of a leak.

[0008] In one embodiment of the present invention, a second tube sheet is also fixedly connected inside the heat exchange shell, forming a hollow layer between the second tube sheet and the first tube sheet. A liquid level detector is fixedly connected to the bottom of the heat exchange shell, and the probe of the liquid level detector is located in the hollow layer. By setting the second tube sheet, a hollow layer is set between the cooling water and the tube box. When a seepage leak occurs, whether it is cooling water or insulating oil, it will first enter the hollow layer and fall to the bottom of the hollow layer under the action of gravity, where it will be detected by the liquid level detector and an alert signal will be issued. This setting not only further improves the isolation effect of the equipment on the coolant and insulating oil, but also adds the detection function of seepage leaks, which can effectively carry out effective rectification measures before the two liquids cross-mix.

[0009] In one embodiment of the present invention, a plurality of plugs are provided on the side of tube sheet one near the tube box. Each plug includes two lifting and lowering plugging blocks. Both tube sheet one and tube sheet two have multiple holes for fixing heat exchange tubes on their surfaces. These holes are divided into multiple groups, each group arranged vertically. The plugs are vertically installed on the surface of tube sheet one and are adapted to each group of holes. When a heat exchange tube is damaged, the corresponding pressure gauge reading will change drastically, while other pressure gauge readings will change less. Numerical analysis can identify which heat exchange tube is leaking. By setting the plugs, the two plugging blocks are controlled to seal both ends of the corresponding heat exchange tube. After sealing, the heat exchange tube no longer participates in the heat exchange process. During heat exchange, insulating oil will no longer enter the heat exchange tube. A small amount of internal heat exchange oil will flow into the heat exchange shell, but this will not affect the overall equipment. With this setup, if a single heat exchange tube leaks, adjustments can be made without stopping the operation, allowing heat exchange to continue normally. Once the transformer has withstood the high-temperature period, equipment maintenance and replacement can then be carried out. This is because external cooling of transformer insulating oil is typically performed when the transformer is under high-temperature load or in other special circumstances. If a sudden leak occurs at this time, rendering the transformer unusable, it could easily lead to transformer damage. This emergency measure ensures smooth external cooling. Simultaneously, due to the high oil pressure, the sealing block will plug the pipe hole under high pressure, ensuring the sealing force and tightness.

[0010] In one embodiment of the present invention, the ends of the heat exchange tubes are bent, and the two ends of the heat exchange tubes are respectively located on the upper and lower sides of the partition. The heat exchange tubes are all symmetrical structures with the partition as the plane of symmetry. Multiple baffles for guiding the cooling water are fixed inside the heat exchange shell. The two ends of the heat exchange tubes are symmetrically arranged, which makes the control of the blocking block more convenient and ensures that the blocking is in place. The baffles allow the cooling water to flow through more paths, thus ensuring the heat exchange effect.

[0011] In one embodiment of the present invention, a protective tube is sleeved in the middle of the heat exchange tube corresponding to each group of tube holes. The end of the protective tube is located outside the heat exchange shell. The probes of multiple pressure gauges are connected to the inside of multiple heat exchange tubes through the protective tube. The protective tube protects the detection and transmission end of the pressure gauge inside, reduces the scouring of cooling water, and ensures the service life of the pressure gauge.

[0012] In one embodiment of the present invention, a plurality of electrically drivable drive gears are provided in the middle of the tube sheet. Vertically arranged transmission rods are provided on both sides of the drive gears. A tooth groove is opened on the side of the transmission rod near the drive gear. The drive gear meshes with the transmission rod through the tooth groove. The end of the transmission rod is fixedly connected to the sealing block. Since the two transmission rods mesh simultaneously on the outside of the same drive gear, the rotation of the drive gear can synchronously drive the two sealing blocks to move closer and further away. At the same time, since the two ends of the heat exchange tube are symmetrically arranged, they are exactly the same as the running trajectory of the two sealing blocks, allowing the two sealing blocks to move exactly to the two ends of the heat exchange tube, ensuring the sealing effect.

[0013] In one embodiment of the present invention, multiple drive motors are fixedly connected to the middle of the hollow layer. The drive gear is rotatably engaged with a surface of the tube sheet. A magnetic coupler is installed at the output end of the drive motor and the rear end of the drive gear. A power supply box for supplying power to the multiple drive motors is fixedly connected to the outside of the heat exchange shell. The drive motor drives the drive gear to rotate, thereby controlling the sealing block to seal. The magnetic coupler includes a magnetic shaft and a magnetic sleeve. The magnetic sleeve is fixed on the drive gear, and the magnetic shaft is fixed at the output end of the drive motor. The magnetic shaft is located inside the magnetic sleeve and is separated by a thin metal layer in the tube sheet. With this arrangement, the power is smoothly transmitted using the magnetic coupler, but there is no perforation, so the insulating oil will not leak into the hollow layer, further improving the anti-leakage effect. At the same time, the drive motor is located in the hollow layer and does not come into contact with any liquid, ensuring the normal working environment of the drive motor.

[0014] In one embodiment of the present invention, the detection box is flat and has a long strip-shaped ultraviolet emitter fixed to its top. Multiple camera modules are also fixed to the top of the detection box. The outputs of the ultraviolet emitter and the camera modules are located inside the detection box. When cooling water enters the detection box, the horizontal arrangement of the box increases the flow area of ​​the cooling water. When the ultraviolet emitter irradiates the outflowing water, the oily substances exhibit fluorescence under ultraviolet light excitation. At this time, the camera modules can quickly observe whether the cooling water contains oil, thereby determining whether the equipment is leaking. This, combined with real-time monitoring by a pressure gauge, completes a dual detection function.

[0015] In one embodiment of the present invention, a plurality of vertical grooves are formed on the surface of the tube sheet, and the transmission rod is slidably engaged in the groove on the side near the groove. The grooves ensure the stable lifting and lowering process of the transmission rod.

[0016] In one embodiment of the present invention, a cover frame is fixedly connected to the front end of the tube sheet, the cover frame is fixedly connected to the partition plate, and the transmission rod is slidably connected to the cover frame. The cover frame is used to block the direct impact of insulating oil on the drive gear. Some insulating oil will still enter the cover frame, but it will not have a significant impact on the drive gear.

[0017] Compared with the prior art, the above-described technical solution of the present invention has the following advantages:

[0018] The present invention provides a forced oil circulation water cooler for a transformer; by setting up a detection box and a pressure regulating valve, it ensures that the returned insulating oil remains clean and will not affect the normal use of the transformer. Even if the leakage is detected late, only a portion of the insulating oil will be lost, and it will still not affect the normal operation of the transformer.

[0019] By installing tube sheet two, a hollow layer is created between the cooling water and the tube box. When a seepage leak occurs, both cooling water and insulating oil will first enter the hollow layer and fall to the bottom of the hollow layer under the influence of gravity. This will be detected by the liquid level detector, which will then issue a warning signal. This design not only further improves the equipment's isolation effect on the coolant and insulating oil but also adds the function of detecting seepage leaks, allowing for effective corrective measures to be taken before the two liquids mix.

[0020] By installing a plug, when a single heat exchange tube leaks, adjustments can be made without stopping the operation, allowing the heat exchange to continue normally. Once the transformer has withstood the high-temperature period, equipment maintenance and replacement can then be carried out. This is because external cooling of transformer insulating oil is generally performed when the transformer is operating under high-temperature load or in other special circumstances. If a leak suddenly occurs at this time, rendering the transformer unusable, it can easily lead to transformer damage. This emergency measure can ensure the smooth progress of external cooling. Attached Figure Description

[0021] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a diagram of the internal structure of the present invention;

[0024] Figure 3 This is a cross-sectional view of the present invention;

[0025] Figure 4 This is a perspective view of tube sheet one and tube sheet two of the present invention;

[0026] Figure 5 This is a perspective view of the tube sheet of the present invention;

[0027] Figure 6 This is a perspective view of the occluder of the present invention;

[0028] Figure 7 This is a connection diagram of the drive gear and drive motor of the present invention;

[0029] Figure 8 This is a perspective view of the testing box of the present invention.

[0030] Explanation of reference numerals in the accompanying drawings: 1. Heat exchanger shell; 2. Tube box; 3. Detection box; 6. Power supply box; 7. Protective tube; 8. Feed pipe; 9. Discharge pipe; 10. Water inlet pipe; 11. Water outlet pipe; 12. Pressure regulating valve; 13. Heat exchanger tube; 14. Baffle plate; 15. Partition plate; 16. Tube sheet one; 17. Tube sheet two; 18. Drive motor; 19. Hollow layer; 20. Pressure gauge; 21. Cover frame; 22. Plug; 23. Tube hole; 24. Slide groove; 25. Plug block; 26. Transmission rod; 27. Drive gear; 28. Gear groove; 29. ​​Magnetic coupler; 30. Ultraviolet light emitter; 31. Camera module; 32. Liquid level detector. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0032] Example

[0033] Reference Figures 1 to 8As shown, a forced oil-circulating water cooler for a transformer according to the present invention includes a heat exchange shell 1 and a tube box 2. The heat exchange shell 1 and the tube box 2 are connected by a flange. A tube sheet 16 is fixedly connected to the connection between the heat exchange shell 1 and the tube box 2. Multiple heat exchange tubes 13 are installed through the surface of the tube sheet 16. The heat exchange tubes 13 are located in the heat exchange shell 1. A horizontally arranged partition 15 is fixedly connected to the middle of the tube box 2. An inlet pipe 8 and an outlet pipe 9 are fixedly connected to the top and bottom of the tube box 2, respectively. A water outlet pipe 11 and an inlet pipe 10 are fixedly connected to the top and bottom of the heat exchange shell 1, respectively. The water outlet pipe 11 and the water inlet pipe 10 are distributed at both ends of the heat exchange shell 1. The invention is characterized in that: multiple pressure gauges 20 are provided on the outside of the heat exchange shell 1. The multiple pressure gauges 20 are respectively connected to the multiple heat exchange tubes 13. A pressure regulating valve 12 is installed at the bottom of the outlet pipe 9. A detection box 3 for detecting cooling water is connected to the outside of the outlet pipe 11.

[0034] By setting up a detection box 3 and a pressure regulating valve 12, the outgoing transformer insulating oil is injected into the upper part of the tube box 2 through the feed pipe 8. After passing through multiple heat exchange tubes 13, it reaches the lower part of the tube box 2. Cooling water is injected into the heat exchange shell 1 from the bottom through the water inlet pipe 10, and the cooled water after heat exchange is continuously discharged from the upper outlet pipe 11, thereby exchanging heat with the insulating oil. The pressure regulating valve 12 is installed at the bottom of the discharge pipe 9, which increases the pressure of the insulating oil injected into the feed pipe 8. With the setting of the pressure regulating valve 12, the pressure of the insulating oil in the tube box 2 and the heat exchange tubes 13 is kept at a high pressure. The pressure value needs to be much higher than the cooling water pressure of the heat exchange shell 1. The pressure gauge 20 monitors the oil pressure in all heat exchange tubes 13 in real time, which also represents the oil pressure in the tube box 2. The pressure gauge 20 can detect values ​​and remotely transmit them to the monitoring terminal for analysis. When leakage occurs, the pressure value drops. The oil pressure is much higher than the water pressure, so only a portion of the insulating oil will enter the cooling water, while the cooling water will not flow back into the insulating oil. Although a leak occurs, it only results in a small loss of insulating oil and will not cause the returned insulating oil to be mixed with cooling water. Therefore, the returned insulating oil can still enter the transformer for normal heat exchange. At this time, the inlet pipe 8 and outlet pipe 9 can be closed to seal the equipment. This setting ensures that the returned insulating oil remains clean and will not affect the normal operation of the transformer. Even if the leak is detected late, only a portion of the insulating oil will be lost, and it will still not affect the normal operation of the transformer. The detection box 3 is used to receive the cooling water flowing out of the heat exchange shell 1 and detect whether the cooling water contains insulating oil. This, together with the pressure gauge 20, achieves a dual detection function, ensuring a rapid response in the event of a leak.

[0035] The heat exchange shell 1 is also fixedly connected to a tube sheet 2 17, and a hollow layer 19 is formed between the tube sheet 2 17 and the tube sheet 1 16. A liquid level detector 32 is fixedly connected to the bottom of the heat exchange shell 1, and the probe of the liquid level detector 32 is located in the hollow layer 19.

[0036] During operation, by setting up tube sheet 2 17, a hollow layer 19 is set between the cooling water and tube box 2. When a seepage leak occurs, whether it is cooling water or insulating oil, it will first enter the hollow layer 19 and fall to the bottom of the hollow layer 19 under the action of gravity. It will be detected by the liquid level detector 32 and a warning signal will be issued. Through this setting, not only is the isolation effect of the equipment on the coolant and insulating oil further improved, but the detection function of seepage leak is also added, which can effectively carry out effective rectification measures before the two liquids mix.

[0037] A plurality of plugs 22 are provided on the side of tube sheet 16 near tube box 2. Each plug 22 includes two plug blocks 25 that can be raised and lowered. Both tube sheet 16 and tube sheet 27 have a plurality of tube holes 23 for fixing heat exchange tubes 13. The plurality of tube holes 23 are divided into multiple groups, and each group of tube holes 23 is arranged vertically. The plurality of plugs 22 are installed vertically on the surface of tube sheet 16 and are adapted to each group of tube holes 23.

[0038] When heat exchange tube 13 is damaged during operation, the corresponding pressure gauge 20 will show a significant change in value, while the values ​​of other pressure gauges 20 will change less. Through numerical analysis, it can be determined which heat exchange tube 13 is leaking. By using the plugging device 22, two plugging blocks 25 are controlled to seal both ends of the corresponding heat exchange tube 13. After sealing, the heat exchange tube 13 no longer participates in heat exchange, and insulating oil will no longer enter it. Simultaneously, a small amount of internal heat exchange oil will flow into the heat exchange shell 1, but this will not affect the overall equipment. This setup allows for uninterrupted adjustments to maintain heat exchange when a single heat exchange tube 13 leaks. Once the transformer has withstood the high-temperature period, equipment maintenance and replacement can then be carried out. External cooling of the transformer's insulating oil typically occurs during high-temperature load operation or other special circumstances. If a sudden leak occurs at this time, rendering the transformer unusable, it could easily damage the transformer. This emergency measure ensures smooth external cooling. Simultaneously, due to the high oil pressure, the sealing block 25 will block the tube hole 23 under high pressure, ensuring sealing strength and tightness.

[0039] The ends of the heat exchange tube 13 are bent. The two ends of the heat exchange tube 13 are located on the upper and lower sides of the partition plate 15, respectively. The heat exchange tube 13 is a symmetrical structure with the partition plate 15 as the symmetrical plane. Multiple baffles 14 for guiding the cooling water direction are fixed inside the heat exchange shell 1.

[0040] During operation, the two ends of the heat exchange tube 13 are arranged symmetrically, making it easier to adjust the sealing block 25 and ensuring proper sealing. The baffle plate 14 allows the cooling water to flow through more paths, ensuring the heat exchange effect.

[0041] A protective tube 7 is sleeved in the middle of the heat exchange tube 13 corresponding to each group of tube holes 23. The end of the protective tube 7 is located on the outside of the heat exchange shell 1. The probes of multiple pressure gauges 20 are connected to the inside of multiple heat exchange tubes 13 through the protective tube 7.

[0042] During operation, the detection and transmission end of the pressure gauge 20 is protected internally by the protective tube 7, reducing the scouring of cooling water and ensuring the service life of the pressure gauge 20.

[0043] The tube sheet 16 has a plurality of electrically driven drive gears 27 in the middle. Both sides of the drive gears 27 are provided with vertically arranged transmission rods 26. The transmission rods 26 have a tooth groove 28 on the side near the drive gears 27. The drive gears 27 mesh with the transmission rods 26 through the tooth grooves 28. The end of the transmission rods 26 is fixedly connected to the sealing block 25.

[0044] During operation, since the two transmission rods 26 mesh simultaneously on the outside of the same drive gear 27, the rotation of the drive gear 27 can synchronously drive the two sealing blocks 25 to move closer and further away. At the same time, since the two ends of the heat exchange tube 13 are symmetrically arranged, they are exactly the same as the running trajectory of the two sealing blocks 25, allowing the two sealing blocks 25 to move exactly to the two ends of the heat exchange tube 13, ensuring the sealing effect.

[0045] Multiple drive motors 18 are fixedly connected to the middle of the hollow layer 19. The drive gear 27 is rotatably engaged with the surface of the tube sheet 16. A magnetic coupler 29 is installed at the output end of the drive motor 18 and the rear end of the drive gear 27. A power supply box 6 for supplying power to the multiple drive motors 18 is fixedly connected to the outside of the heat exchange shell 1.

[0046] During operation, the drive motor 18 drives the drive gear 27 to rotate, thereby controlling the sealing block 25 to seal. The magnetic coupler 29 includes a magnetic shaft and a magnetic sleeve. The magnetic sleeve is fixed on the drive gear 27, and the magnetic shaft is fixed at the output end of the drive motor 18. The magnetic shaft is located inside the magnetic sleeve, separated by a thin metal layer in the tube sheet 16. With this configuration, the magnetic coupler 29 can smoothly transmit power without perforation, preventing insulating oil from leaking into the hollow layer 19, further improving the leak prevention effect. At the same time, the drive motor 18 is located in the hollow layer 19 and does not come into contact with any liquid, ensuring the normal working environment of the drive motor 18.

[0047] The detection box 3 is flat and has a long strip-shaped ultraviolet light emitter 30 fixed to its top. Multiple camera modules 31 are also fixed to the top of the detection box 3. The output ends of the ultraviolet light emitter 30 and the camera modules 31 are located inside the detection box 3.

[0048] During operation, when cooling water enters the detection chamber 3, the horizontal setting of the detection chamber 3 increases the flow area of ​​the cooling water. When the water flows out, the ultraviolet light emitter 30 irradiates it. Oily substances produce fluorescence under ultraviolet light excitation. At this time, the camera module 31 can quickly observe whether there is oil in the cooling water, thereby determining whether the equipment has leaked. This, combined with the real-time monitoring of the pressure gauge 20, completes the dual detection function.

[0049] The surface of the tube sheet 16 has multiple vertical grooves 24, and the transmission rod 26 is slidably engaged in the groove 24 on the side near the groove 24.

[0050] During operation, the chute 24 ensures the stable lifting and lowering of the transmission rod 26.

[0051] A cover frame 21 is fixedly connected to the front end of the tube sheet 16. The cover frame 21 is fixedly connected to the partition plate 15, and the transmission rod 26 is slidably connected to the cover frame 21.

[0052] During operation, the cover frame 21 is used to block the direct impact of the insulating oil on the drive gear 27. Some insulating oil will still enter the cover frame 21, but it will not have a significant impact on the drive gear 27.

[0053] Working principle:

[0054] The transformer insulating oil is injected into the upper part of the tube box 2 through the feed pipe 8, and after passing through multiple heat exchange tubes 13, it reaches the lower part of the tube box 2. Cooling water is injected into the heat exchange shell 1 from the bottom through the water inlet pipe 10, and the cooled water after heat exchange is continuously discharged from the upper outlet pipe 11, thereby exchanging heat with the insulating oil. The pressure regulating valve 12 is installed at the bottom of the outlet pipe 9, which increases the pressure of the insulating oil injected into the feed pipe 8. With the setting of the pressure regulating valve 12, the pressure of the insulating oil in the tube box 2 and the heat exchange tubes 13 is kept at a high pressure, and the pressure value needs to be much higher than the cooling water pressure of the heat exchange shell 1. The oil pressure in all heat exchange tubes 13 is monitored in real time by the pressure gauge 20, which also represents the oil pressure in the tube box 2. The pressure gauge 20 can detect values ​​and remotely transmit them to the monitoring terminal for analysis. When leakage occurs, the pressure value drops because the oil pressure is much higher than the water pressure. Therefore, only a portion of the insulating oil will enter the cooling water, while the cooling water will not flow back into the insulating oil. Although a leak occurs, it only results in a small loss of insulating oil and will not cause the returned insulating oil to be mixed with cooling water. Thus, the returned insulating oil can still enter the transformer for normal heat exchange. At this time, the inlet pipe 8 and outlet pipe 9 can be closed to seal the equipment. This setting ensures that the returned insulating oil remains clean and will not affect the normal operation of the transformer. Even if the leak is detected late, only a portion of the insulating oil will be lost, and it will still not affect the normal operation of the transformer. The detection box 3 is used to receive the cooling water flowing out of the heat exchange shell 1 and detect whether the cooling water contains insulating oil. This, together with the pressure gauge 20, achieves a dual detection function, ensuring a rapid response when a leak occurs.

[0055] By setting up tube sheet 2 17, a hollow layer 19 is set between the cooling water and the tube box 2. When a seepage leak occurs, whether it is cooling water or insulating oil, it will first enter the hollow layer 19 and fall to the bottom of the hollow layer 19 under the action of gravity. It will be detected by the liquid level detector 32 and a warning signal will be issued. This setting not only further improves the isolation effect of the equipment on the coolant and insulating oil, but also adds the detection function of seepage leak, which can effectively carry out effective rectification measures before the two liquids cross-mix.

[0056] When heat exchange tube 13 is damaged, the corresponding pressure gauge 20 will show a significant change in value, while the other pressure gauges 20 will show smaller changes. Through numerical analysis, it can be determined which heat exchange tube 13 is leaking. By using the plugging device 22, two plugging blocks 25 are controlled to seal both ends of the corresponding heat exchange tube 13. After sealing, the heat exchange tube 13 no longer participates in heat exchange, and insulating oil will no longer enter the heat exchange tube 13. Simultaneously, a small amount of internal heat exchange oil will flow into the heat exchange shell 1, but this will not affect the overall equipment. This design... In case of leakage in a single heat exchange tube 13, adjustments can be made without stopping the operation to allow the heat exchange to continue normally. Once the transformer has withstood the high-temperature period, equipment maintenance and replacement can be carried out. This is because the external cooling of the transformer insulating oil is usually performed when the transformer is under high-temperature load or in other special circumstances. If a sudden leak occurs at this time and the transformer cannot be used, it can easily lead to transformer damage. This emergency measure can ensure the smooth progress of external cooling. At the same time, due to the high oil pressure, the sealing block 25 will block the tube hole 23 under high pressure to ensure the sealing force and sealing performance.

[0057] The heat exchange tubes 13 are arranged symmetrically at both ends, which makes it easier to adjust the sealing block 25 and ensures that the sealing is in place. The baffle plate 14 allows the cooling water to flow through more paths, ensuring the heat exchange effect.

[0058] The detection and transmission end of the pressure gauge 20 is protected internally by the protective tube 7, which reduces the scouring of cooling water and ensures the service life of the pressure gauge 20.

[0059] Since the two transmission rods 26 mesh simultaneously on the outside of the same drive gear 27, the rotation of the drive gear 27 can synchronously drive the two sealing blocks 25 to move closer and further away. At the same time, since the two ends of the heat exchange tube 13 are symmetrically arranged, they are exactly the same as the running trajectory of the two sealing blocks 25, allowing the two sealing blocks 25 to move exactly to the two ends of the heat exchange tube 13, ensuring the sealing effect.

[0060] The drive motor 18 drives the drive gear 27 to rotate, thereby controlling the sealing block 25 to seal. The magnetic coupler 29 includes a magnetic shaft and a magnetic sleeve. The magnetic sleeve is fixed on the drive gear 27, and the magnetic shaft is fixed at the output end of the drive motor 18. The magnetic shaft is located inside the magnetic sleeve, separated by a thin metal layer in the tube sheet 16. With this arrangement, the magnetic coupler 29 can smoothly transmit power without perforation, preventing insulating oil from leaking into the hollow layer 19, further improving the leak prevention effect. At the same time, the drive motor 18 is located in the hollow layer 19 and does not come into contact with any liquid, ensuring the normal working environment of the drive motor 18.

[0061] When cooling water enters the detection chamber 3, the horizontal setting of the detection chamber 3 increases the flow area of ​​the cooling water. When the water flows out, the ultraviolet light emitter 30 irradiates it. Oily substances produce fluorescence under ultraviolet light excitation. At this time, the camera module 31 can quickly observe whether there is oil in the cooling water, thereby determining whether the equipment has leaked. This, together with the real-time monitoring of the pressure gauge 20, completes the dual detection function.

[0062] The chute 24 ensures the stable lifting and lowering process of the transmission rod 26;

[0063] The cover frame 21 is used to block the direct impact of the insulating oil on the drive gear 27. Some insulating oil will still enter the cover frame 21, but it will not have a significant impact on the drive gear 27.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A forced oil-circulating water cooler for a transformer, comprising a heat exchange shell (1) and a tube box (2), wherein the heat exchange shell (1) and the tube box (2) are connected by a flange, a tube sheet (16) is fixedly connected at the connection between the heat exchange shell (1) and the tube box (2), and multiple heat exchange tubes (13) are installed through the surface of the tube sheet (16), wherein the heat exchange tubes (13) are located in the heat exchange shell (1), a horizontally arranged partition (15) is fixedly connected in the middle of the tube box (2), an inlet pipe (8) and an outlet pipe (9) are fixedly connected to the top and bottom of the tube box (2), respectively, and an outlet pipe (11) and an inlet pipe (10) are fixedly connected to the top and bottom of the heat exchange shell (1), respectively, wherein the outlet pipe (11) and the inlet pipe (10) are distributed at both ends of the heat exchange shell (1), characterized in that: Multiple pressure gauges (20) are provided on the outside of the heat exchange shell (1), and the multiple pressure gauges (20) are respectively connected to multiple heat exchange tubes (13). A pressure regulating valve (12) is installed at the bottom of the discharge pipe (9), and a detection box (3) for detecting cooling water is connected to the outside of the water outlet pipe (11). The heat exchange shell (1) is also fixedly connected to a tube sheet two (17), and a hollow layer (19) is formed between the tube sheet two (17) and the tube sheet one (16). A liquid level detector (32) is fixedly connected to the bottom of the heat exchange shell (1), and the probe of the liquid level detector (32) is located in the hollow layer (19). On the side of tube sheet 1 (16) near tube box (2), there are multiple plugs (22). Each plug (22) includes two plug blocks (25) that can be raised and lowered. Both tube sheet 1 (16) and tube sheet 2 (17) have multiple tube holes (23) for fixing heat exchange tubes (13). The multiple tube holes (23) are divided into multiple groups. Each group of tube holes (23) is arranged vertically. The multiple plugs (22) are installed vertically on the surface of tube sheet 1 (16) and are adapted to each group of tube holes (23).

2. The forced oil-circulating water cooler for a transformer according to claim 1, characterized in that: The ends of the heat exchange tube (13) are bent. The two ends of the heat exchange tube (13) are located on the upper and lower sides of the partition (15), and the heat exchange tube (13) is a symmetrical structure with the partition (15) as the symmetrical plane. Multiple baffles (14) for guiding the cooling water direction are fixed inside the heat exchange shell (1).

3. The forced oil-circulating water cooler for a transformer according to claim 2, characterized in that: Each group of tube holes (23) has a protective tube (7) sleeved in the middle of the heat exchange tube (13). The end of the protective tube (7) is located outside the heat exchange shell (1). The probes of multiple pressure gauges (20) are connected to the inside of multiple heat exchange tubes (13) through the protective tube (7).

4. The forced oil-circulating water cooler for a transformer according to claim 3, characterized in that: The tube sheet (16) is provided with a plurality of electrically driven drive gears (27) in the middle. Both sides of the drive gears (27) are provided with vertically arranged transmission rods (26). The transmission rods (26) have a tooth groove (28) on the side near the drive gears (27). The drive gears (27) mesh with the transmission rods (26) through the tooth grooves (28). The end of the transmission rods (26) is fixedly connected to the sealing block (25).

5. The forced oil-circulating water cooler for a transformer according to claim 4, characterized in that: Multiple drive motors (18) are fixedly connected to the middle of the hollow layer (19). The drive gear (27) is rotatably engaged with the surface of the tube sheet (16). A magnetic coupler (29) is installed at the output end of the drive motor (18) and the rear end of the drive gear (27). A power supply box (6) for supplying power to the multiple drive motors (18) is fixedly connected to the outside of the heat exchange shell (1).

6. The forced oil-circulating water cooler for a transformer according to claim 5, characterized in that: The detection box (3) is flat and has a long strip of ultraviolet light emitter (30) fixed to the top. Multiple camera modules (31) are also fixed to the top of the detection box (3). The output ends of the ultraviolet light emitter (30) and the camera modules (31) are located inside the detection box (3).

7. The forced oil-circulating water cooler for a transformer according to claim 6, characterized in that: The surface of the tube sheet (16) has multiple vertical grooves (24), and the transmission rod (26) is slidably engaged in the groove (24) on the side near the groove (24).

8. The forced oil-circulating water cooler for a transformer according to claim 7, characterized in that: A cover frame (21) is fixedly connected to the front end of the tube sheet (16). The cover frame (21) is fixedly connected to the partition plate (15), and the transmission rod (26) is slidably connected to the cover frame (21).

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