Transformer oil-air cooler capable of automatically adjusting temperature and operation control method of transformer oil-air cooler

Abstract

The invention discloses a transformer oil-air cooler capable of automatically adjusting temperature. The transformer oil-air cooler comprises a cooler body, a wind scooper is mounted on the cooler body, a fan is mounted in the wind scooper, an oil inlet pipe and an oil outlet pipe are arranged on the cooler body, a butterfly valve is connected to the oil outlet pipe, an oil pump is connected to the butterfly valve, and an outlet of the oil pump is connected with a connecting pipe; a heating assembly is installed on the cooler body and comprises a heating pipe and a protective net, and a connector lug is arranged at the end of the heating pipe. And a temperature measuring element is arranged on the oil outlet pipe. According to the transformer oil-air cooler capable of automatically adjusting the temperature, when the environment temperature is low in winter, transformer oil can be rapidly heated, and the situation that due to the fact that the transformer oil temperature is too low and the viscosity is large, an oil pump is overloaded is avoided; and the heating assembly with a specific structure also has a protection effect on fins of the cooler. Correspondingly, the invention further provides an operation control method of the transformer oil-air cooler capable of automatically adjusting the temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil air coolers, in particular to a transformer oil air cooler for automatic temperature adjustment and a running control method thereof. BACKGROUND

[0002] As one of the most core electrical equipment in the power system, the safe operation of the transformer is directly related to the safety and stability of the power grid. When the transformer is running, the losses in the winding and the core will generate a large amount of heat, which must be dissipated in time to prevent overheating and cause insulation damage. Therefore, the cooler is an essential auxiliary facility in the operation of the transformer. The cooler is a type of heat exchange equipment used to cool the fluid, usually using water or air as the coolant to remove heat; it can be mainly divided into tube-type cooler, plate-type cooler and air-cooled cooler. Among them, the oil air cooler is widely used in large transformers, and its cooling performance maintains the normal working oil temperature of the transformer, so that the transformer can operate normally.

[0003] Most of the existing transformer coolers only consider the problem of heat dissipation. For example, the Chinese patent document CN113674955B discloses an oil air cooler with elliptical finned tubes, which includes a fan panel, a fan cover is installed on the fan panel, and a fan is installed in the fan cover; two side plates are installed on both sides of the fan panel to form a heat exchange area; a heat exchange core assembly is arranged in the heat exchange area; characterized in that: the heat exchange core assembly includes a group of elliptical finned tubes, the two ends of the elliptical finned tubes are connected with a floating oil inlet pipe box and a fixed oil outlet pipe box respectively; the elliptical finned tube includes a base pipe, the cross section of the base pipe is elliptical, and the surface of the base pipe is provided with stacked fins; the fins are provided with mixing holes, and the edges of the mixing holes are provided with turbulence fins; the floating oil inlet pipe box is floatingly connected with the side plate and can float in the axial direction of the elliptical finned tube, and the fixed oil outlet pipe box is fixedly connected with the side plate; it can cool the transformer, and has the advantages of compact structure, good reliability and high heat dissipation efficiency.

[0004] However, in winter, the temperature is low, the temperature of the transformer oil in the cooler is low, the viscosity is large, the oil pump runs with large resistance, the overloading of the oil pump will reduce the service life of the oil pump, and in severe cases, it will affect the normal operation of the transformer; and the fins of the conventional oil air cooler are not protected, and the fins are easily damaged. Therefore, it is urgent to develop a transformer oil air cooler structure to meet the normal use of the transformer in winter. SUMMARY

[0005] To address the shortcomings of existing technologies, this application provides an automatically temperature-controlled transformer oil air cooler. This automatically temperature-controlled transformer oil air cooler can rapidly heat the transformer oil in low ambient temperatures during winter, preventing oil pump overload caused by excessively low oil temperature and high viscosity; furthermore, the specially structured heating components also protect the cooler's fins. Correspondingly, this application also provides an operation control method for the automatically temperature-controlled transformer oil air cooler.

[0006] Regarding the cooler, the technical solution of this application is as follows:

[0007] An automatically temperature-regulating transformer oil cooler includes a cooler body. An air guide shroud is installed on one side of the cooler body, and a fan is installed inside the air guide shroud. The cooler body has an oil inlet pipe and an oil outlet pipe. A butterfly valve is connected to the oil outlet pipe, and an oil pump is connected to the butterfly valve. A pipe is connected to the outlet of the oil pump. A heating assembly is installed on the side of the cooler body away from the fan. The heating assembly includes a heating tube and a protective net outside the heating tube. The heating tube and the protective net are fixedly connected, and the protective net is fixedly connected to the cooler body, covering the air inlet surface of the cooler body. A connector is provided at the end of the heating tube. A temperature sensing element is installed on the oil outlet pipe to measure the temperature of the transformer oil inside the oil outlet pipe. When the temperature sensing element detects that the transformer oil temperature is too low, the fan is turned on, creating a negative pressure inside the cooler body, forcing outside air into the cooler. Simultaneously, the heating tube is turned on to heat the air passing through it, thereby raising the temperature of the transformer oil inside the cooler through heat exchange and reducing the load on the oil pump.

[0008] Compared with the prior art, the automatic temperature-regulating transformer oil air cooler of this application, by setting heating components and temperature measuring elements on the cooler body, allows external air to enter the cooler under the action of a fan when the ambient temperature is low in winter. After being heated by the heating components, the air enters the cooler and transfers heat to the transformer oil in the heat dissipation pipe, rapidly heating the transformer oil inside the cooler. This avoids oil pump overload caused by low oil temperature and high viscosity. In other words, this invention can improve the service life of the oil pump and reduce the failure rate. Furthermore, the heating components of this application include a protective net set at the end of the cooler body, which can protect the fins of the cooler.

[0009] As an optimization, the protective mesh in the aforementioned automatically temperature-controlled transformer oil cooler has insulating capabilities. This structure effectively prevents accidental contact by workers, thus avoiding electric shock accidents and significantly improving safety.

[0010] As an optimization, in the aforementioned automatically temperature-regulating transformer oil cooler, the heating component is provided with an adaptive ventilation and heat preservation mechanism on the side away from the cooler body; the adaptive ventilation and heat preservation mechanism includes a mounting frame and a set of adaptive wind baffle assemblies arranged side by side; the adaptive wind baffle assembly includes a wind baffle and two coil spring assemblies respectively located at both ends of the wind baffle, both ends of the wind baffle are provided with an eccentrically arranged rotating shaft, and the rotating shaft is provided with a pull block; the coil spring assembly includes a coil spring mounting seat and a coil spring; the rotating shaft passes through the through hole in the middle of the coil spring, and the pull block on the rotating shaft cooperates with the extension end of the coil spring; the fixed end of the coil spring is fixed in the slot of the coil spring mounting seat. Therefore, when it is necessary to heat the transformer oil in the cooler, the fan is started to create a negative pressure zone inside the cooler. Under the action of external atmospheric pressure, the baffle plate automatically opens, allowing outside air to enter and transfer the heat generated by the heating components to the transformer oil, causing the transformer oil to heat up rapidly. After the transformer oil temperature rises to the set value, the power supply to the heating components and the fan is disconnected, and the baffle plate automatically resets and closes under the action of the coil spring, creating a heat preservation zone inside the cooler and reducing energy consumption.

[0011] As an optimization, in the aforementioned automatically temperature-regulating transformer oil cooler, the mounting frame is provided with a set of placement slots for placing coil spring mounting seats, and the coil spring mounting seats are provided with limiting blocks; a cover plate is provided above the placement slots, and the cover plate is provided with a set of limiting slots that are adapted to the limiting blocks. Using this structure, the mounting seats are fixed through the cooperation of the limiting blocks and limiting slots, resulting in a simple structure and convenient installation. Furthermore, the mounting frame is provided with a groove, and the cover plate is placed in the groove, with the surface of the cover plate flush with the surface of the mounting frame. This structure makes the overall structure more aesthetically pleasing.

[0012] As an optimization, in the aforementioned automatically temperature-regulating transformer oil-air cooler, the mounting frame is equipped with a set of limiting posts. These limiting posts abut against the surface of the baffle plate to limit its movement during resetting. With this structure, the baffle plate achieves better closure after resetting, thereby improving the heat preservation effect.

[0013] As an optimization, in the aforementioned automatically temperature-regulating transformer oil cooler, the limiting post is screwed to the mounting frame. This structure is simple and easy to install.

[0014] As an optimization, in the aforementioned automatic temperature-regulating transformer oil cooler, the extension end of the coil spring is L-shaped, and correspondingly, the pull block is also L-shaped; the extension end of the coil spring is fastened to the pull block. With this structure, the connection between the pull block and the coil spring is tight and highly reliable.

[0015] As an optimization, in the aforementioned automatically temperature-regulating transformer oil cooler, an annular baffle is provided on the rotating shaft. The surface of the annular baffle abuts against the coil spring, and the outer surface of the annular baffle and the inner surface of the coil spring mounting base form a rotating pair structure. This structure prevents the coil spring from shifting during operation, thus avoiding detachment and failure. Furthermore, the relatively sealed space formed between the annular baffle and the coil spring mounting base prevents external cold air from entering the cooler, improving the structure's insulation effect.

[0016] Regarding the method, the technical solution of this application is as follows:

[0017] An operation control method for an automatically temperature-controlled transformer oil air cooler is provided. This method uses the aforementioned automatically temperature-controlled transformer oil air cooler to regulate the temperature of the transformer oil inside the cooler. When the temperature sensing element on the oil outlet pipe detects that the oil temperature is lower than the set lower threshold, the fan and heating assembly are started. A negative pressure zone is formed inside the cooler body under the action of the fan. External air is heated by the heating assembly and enters the cooler body, transferring heat to the cooler body and heating the transformer oil inside. When the temperature sensing element detects that the oil temperature is between the set upper and lower thresholds, the power to the fan and heating assembly is turned off, allowing the transformer oil inside the cooler to dissipate heat naturally. When the temperature sensing element detects that the oil temperature is higher than the set upper threshold, the fan is started and the heating assembly is turned off, drawing in external cold air into the cooler for heat exchange with the transformer oil inside.

[0018] Compared with the prior art, the automatic temperature-regulating transformer oil air cooler operation control method of this application can automatically regulate the temperature of the transformer oil inside the cooler, avoid oil pump overload caused by excessively low oil temperature in winter, and at the same time, the reasonable control of natural cooling and fan air cooling timing is conducive to reducing energy consumption.

[0019] As an optimization, in the aforementioned automatic temperature-regulating transformer oil-air cooler operation control method, the upper threshold is 50-55℃ and the lower threshold is 0-10℃. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the automatically temperature-regulating transformer oil-air cooler in this application;

[0021] Figure 2 This is a schematic diagram of the adaptive ventilation and insulation mechanism and heating component in this application;

[0022] Figure 3 yes Figure 2 Another perspective view in the image;

[0023] Figure 4 This is a schematic diagram of the heating assembly in this application;

[0024] Figure 5 This is a schematic diagram of the installation frame in this application;

[0025] Figure 6 This is a schematic diagram of the cover plate in this application;

[0026] Figure 7 This is a structural schematic diagram of the adaptive wind deflector assembly in this application;

[0027] Figure 8 This is a schematic diagram of the structure of the wind deflector in this application;

[0028] Figure 9 This is a schematic diagram of the structure of the coil spring mounting base and the coil spring in this application;

[0029] Figure 10 This is a schematic diagram of the structure of the coil spring mounting base in this application.

[0030] The labels in the attached diagram are as follows: 1-Cooler body, 11-Oil inlet pipe, 12-Oil outlet pipe; 2-Air guide shroud; 3-Fan; 4-Heating component, 41-Heating tube, 42-Protective net, 43-Connector; 5-Butterfly valve; 6-Oil pump; 7-Connecting pipe; 8-Adaptive ventilation and insulation mechanism, 81-Mounting frame, 811-Placement slot, 812-Groove, 82-Adaptive baffle assembly, 821-Baffle, 8211-Rotating shaft, 8212-Pull block, 8213-Annular baffle, 822-Spring assembly, 8221-Spring mounting seat, 8222-Spring, 8223-Limiting block, 83-Cover plate, 831-Limiting groove, 84-Limiting post. Detailed Implementation

[0031] The present application will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present application. In the following embodiments, content not described in detail or shown in detail in the accompanying drawings is common knowledge in the art.

[0032] Example (see) Figures 1-10 ):

[0033] An automatically temperature-regulating transformer oil cooler includes a cooler body 1. A guide shroud 2 is installed on one side of the cooler body 1, and a fan 3 is installed inside the guide shroud 2. The cooler body 1 has an oil inlet pipe 11 and an oil outlet pipe 12. A butterfly valve 5 is connected to the oil outlet pipe 12, and an oil pump 6 is connected to the butterfly valve 5. A connecting pipe 7 is connected to the outlet of the oil pump 6. A heating assembly 4 is installed on the side of the cooler body 1 away from the fan 3. The heating assembly 4 includes a heating pipe 41 and a protective net 42 located outside the heating pipe 41. The heating pipe 41 and the protective net 42 are fixedly connected. The protective net 42 is fixedly connected to the cooler body 1, covering the air inlet surface of the cooler body 1. A connector 43 is provided at the end of the heating pipe 41. A temperature measuring element is provided on the oil outlet pipe 12 to measure the temperature of the transformer oil inside the oil outlet pipe 12.

[0034] In this embodiment, the protective net 42 has insulating capabilities. This structure prevents the protective net 42 from directly contacting the outside air, reducing the risk of short circuits; it also prevents accidental contact by workers, thus avoiding electric shock accidents and effectively improving safety.

[0035] In this embodiment, on the heating component 4, an adaptive ventilation and heat preservation mechanism 8 is provided on the side away from the cooler body 1 (i.e., the outer side). The adaptive ventilation and heat preservation mechanism 8 includes a mounting frame 81 and a set of adaptive wind deflector assemblies 82 arranged side by side. The adaptive wind deflector assembly 82 includes a wind deflector 821 and two coil spring assemblies 822 respectively provided at both ends of the wind deflector 821. Both ends of the wind deflector 821 are provided with eccentrically arranged rotating shafts 8211, and the rotating shafts 8211 are provided with pull blocks 8212. The coil spring assembly 822 includes a coil spring mounting seat 8221 and a coil spring 8222. The rotating shaft 8211 passes through the through hole in the middle of the coil spring 8222, and the pull block 8212 on the rotating shaft 8211 cooperates with the tension end of the coil spring 8222. The fixed end of the coil spring 8222 is fixed in the slot of the coil spring mounting seat 8221. With this structure, when it is necessary to heat the transformer oil in the cooler, the fan 3 is started to create a negative pressure zone inside the cooler. Under the action of external atmospheric pressure, the baffle 821 automatically opens (the attached figure shows the closed state), allowing outside air to enter and transfer the heat generated by the heating component 4 to the transformer oil, causing the transformer oil to heat up rapidly. After the transformer oil temperature rises to the set value, the power supply to the heating component 4 and the fan 3 is disconnected. The baffle 821 automatically resets and closes under the action of the coil spring 8222, creating a heat preservation zone inside the cooler and reducing energy consumption.

[0036] In this embodiment, the mounting frame 81 is provided with a set of placement slots 811 for placing the coil spring mounting base 8221, and the coil spring mounting base 8221 is provided with a limiting block 8223; a cover plate 83 is provided above the placement slots 811, and the cover plate 83 is provided with a set of limiting slots 831 that are adapted to the limiting block 8223. With this structure, the mounting base 8221 is fixed by the cooperation of the limiting block 8223 and the limiting slots 831, resulting in a simple structure and convenient installation.

[0037] In this embodiment, the mounting frame 81 is provided with a groove 812, and the cover plate 83 is disposed in the groove 812, with the surface of the cover plate 83 flush with the surface of the mounting frame 81. This structure makes the overall structure more aesthetically pleasing.

[0038] In this embodiment, the mounting frame 81 is provided with a set of limiting posts 84, which abut against the surface of the wind baffle 821 to limit the wind baffle 821 when it is reset. With this structure, the wind baffle 821 has a better closing effect after reset, thereby improving the heat preservation effect.

[0039] In this embodiment, the limiting post 84 is screwed to the mounting frame 81. This structure is simple and easy to install.

[0040] In this embodiment, the extension end of the coil spring 8222 is L-shaped, and correspondingly, the pull block 8212 is also L-shaped; the extension end of the coil spring 8222 is fastened to the pull block 8212. With this structure, the connection between the pull block 8212 and the coil spring 8222 is tight and highly reliable.

[0041] In this embodiment, an annular baffle 8213 is provided on the rotating shaft 8211. The surface of the annular baffle 8213 abuts against the coil spring 8222, and the outer surface of the annular baffle 8213 and the inner surface of the coil spring mounting base 8221 form a rotating pair structure. This structure prevents the coil spring 8222 from shifting during operation, thus avoiding detachment and failure. Furthermore, the relatively sealed space formed between the annular baffle 8213 and the coil spring mounting base 8221 prevents external cold air from entering the cooler, improving the structure's insulation effect.

[0042] When the automatic temperature-regulating transformer oil cooler of this embodiment is working, when the temperature measuring element on the oil outlet pipe 12 detects that the oil temperature is lower than the set lower threshold of 0°C, the fan 3 and the heating component 4 are started. The interior of the cooler body 1 forms a negative pressure zone under the action of the fan 3. Under the action of air pressure, the baffle 821 automatically opens, allowing external air to enter. After being heated by the heating component 4, the external air enters the interior of the cooler and transfers heat to the cooler body 1, rapidly heating the transformer oil inside the cooler. When the temperature measuring element detects that the oil temperature is within the set range of 0-50°C, the power to the fan 3 and the heating component 4 is turned off. The baffle 821 automatically resets under the action of the coil spring 8222, blocking external air from entering the cooler, so that the interior space of the cooler forms a heat preservation zone, reducing the energy consumption of the heating tube 41. When the temperature measuring element detects that the oil temperature is higher than the set upper threshold of 50°C, the fan 3 is started and the heating component 4 is turned off, drawing external cold air into the interior of the cooler for rapid heat exchange with the transformer oil inside the cooler.

[0043] The foregoing general description of the invention and its specific embodiments should not be construed as a limitation on the technical solution of the invention. Those skilled in the art, based on the disclosure of this application, can add, reduce, or combine the disclosed technical features in the foregoing general description and / or specific embodiments (including examples) without departing from the constituent elements of the invention, to form other technical solutions within the scope of protection of this application.

Claims

1. An automatically temperature-regulating transformer oil-air cooler, comprising a cooler body (1), a guide shroud (2) installed on one side of the cooler body (1), a fan (3) installed inside the guide shroud (2), an oil inlet pipe (11) and an oil outlet pipe (12) provided on the cooler body (1), a butterfly valve (5) connected to the oil outlet pipe (12), an oil pump (6) connected to the butterfly valve (5), and a connecting pipe (7) connected to the outlet of the oil pump (6); characterized in that: The cooler body (1) is provided with a heating assembly (4) on the side away from the fan (3), the heating assembly (4) comprises a heating pipe (41) and a protective net (42) arranged outside the heating pipe (41), the heating pipe (41) is fixedly connected with the protective net (42), the protective net (42) is fixedly connected with the cooler body (1) and covers the air inlet surface of the cooler body (1), and the end of the heating pipe (41) is provided with a terminal (43); the oil outlet pipe (12) is provided with a temperature measuring element for measuring the oil temperature of the transformer oil in the oil outlet pipe (12); when the temperature measuring element detects that the oil temperature of the transformer oil is too low, the fan (3) is started to generate negative pressure in the cooler body (1) to make external air enter the cooler, at the same time, the heating pipe (41) is started to heat the air passing through the heating pipe, and then the transformer oil in the cooler is heated through heat exchange, thereby reducing the load of the oil pump.

2. The self-regulating transformer oil air cooler according to claim 1, characterized in that: The protective net (42) has insulation capability.

3. The self-regulating transformer oil air cooler of claim 1, wherein: The heating assembly (4) is provided with an adaptive ventilation and heat preservation mechanism (8) on the side away from the cooler body (1); the adaptive ventilation and heat preservation mechanism (8) comprises a mounting frame (81) and a plurality of adaptive baffle assemblies (82) arranged side by side; the adaptive baffle assembly (82) comprises a baffle (821) and two coil spring assemblies (822) arranged at the two ends of the baffle (821) respectively, the two ends of the baffle (821) are provided with eccentric rotating shafts (8211), and the rotating shafts (8211) are provided with pull blocks (8212); the coil spring assembly (822) comprises a coil spring mounting seat (8221) and a coil spring (8222); the rotating shaft (8211) penetrates through the through hole in the middle of the coil spring (8222), and the pull block (8212) on the rotating shaft (8211) is matched with the stretching end of the coil spring (8222); and the fixed end of the coil spring (8222) is fixed in the clamping groove of the coil spring mounting seat (8221).

4. The self-regulating transformer oil air cooler according to claim 3, characterized in that: The mounting frame (81) is provided with a plurality of placement grooves (811) for placing the coil spring mounting seat (8221), and the coil spring mounting seat (8221) is provided with a limiting block (8223); the upper portion of the placement groove (811) is provided with a cover plate (83), and the cover plate (83) is provided with a plurality of limiting grooves (831) matched with the limiting block (8223).

5. The automatically temperature-adjusted transformer oil air cooler according to claim 4, wherein the mounting frame (81) is provided with a plurality of limiting columns (84), the limiting columns (84) abut against the surface of the baffle (821) and are used for limiting the baffle (821) when the baffle (821) is reset.

6. The self-regulating transformer oil air cooler according to claim 5, characterized in that: The limiting column (84) is screwed with the mounting frame (81).

7. The self-regulating transformer oil air cooler according to claim 6, characterized in that: The stretching end of the coil spring (8222) is L-shaped, and correspondingly, the pull block (8212) is also L-shaped; and the stretching end of the coil spring (8222) is connected with the pull block (8212) through buckling.

8. The self-regulating transformer oil air cooler according to any of claims 3-7, characterized in that: The rotating shaft (8211) is provided with an annular baffle (8213), a surface of the annular baffle (8213) abuts against a coil spring (8222), and an outer surface of the annular baffle (8213) and an inner surface of a coil spring mounting seat (8221) form a rotating pair structure.

9. The method of claim 1, wherein the operation of the automatically temperature-regulated transformer oil air cooler is controlled by: When the temperature measuring element on the oil outlet pipe (12) detects that the oil temperature is lower than the set lower threshold value, the fan (3) and the heating assembly (4) are started, the inside of the cooler body (1) forms a negative pressure area under the action of the fan (3) air suction, the external air enters the inside of the cooler after being heated by the heating assembly (4), and heat is transmitted to the cooler body (1), so that the transformer oil in the inside of the cooler is heated; When the temperature measuring element detects that the oil temperature is between the set upper threshold value and the lower threshold value, the power supply of the fan (3) and the heating assembly (4) is turned off, so that the transformer oil in the inside of the cooler is naturally cooled; When the temperature measuring element detects that the oil temperature is higher than the set upper threshold value, the fan (3) is started, and the heating assembly (4) is turned off, so that the external cold air is sucked into the inside of the cooler and exchanges heat with the transformer oil in the inside of the cooler.

10. The operation control method of the self-regulating transformer oil air cooler according to claim 9, characterized in that: The upper threshold value is 50-55℃, and the lower threshold value is 0-10℃.

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