A transformer drying device

Abstract

The present application relates to transformer drying technical field, specifically to a kind of transformer drying device, the equipment includes base, weighing device is installed at the bottom of base, buffer tank, metering tank, first refrigerator and second refrigerator are installed on base.Transformer is carried out drying treatment, exhaust pipe is connected with vacuum pump, air inlet pipe is communicated with transformer inside, and the air in transformer inside is extracted by vacuum pump.First refrigerator is cooled to the air in air inlet pipe, and part of moisture in air is condensed, and the air of preliminary drying enters exhaust pipe, and the remaining moisture in the air of preliminary drying is condensed by the refrigeration of second refrigerator.The weight of the whole equipment is increased by the condensed water generated, and the real-time weight of the whole equipment is weighed by weighing device.When the weight displayed by weighing device is no longer increased, it can reflect the drying degree inside transformer.The technical scheme is mainly used for transformer drying, so as to directly show the drying degree inside transformer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer drying, in particular to a transformer drying device. BACKGROUND

[0002] Oil-immersed transformer is a kind of transformer which uses oil as the main insulation means and relies on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooling, oil-immersed water-cooling and forced oil circulation.

[0003] Before the oil-immersed transformer is put into operation, in order to ensure the insulation performance of the transformer, a vacuum pump is usually used to pump the inside of the transformer to vacuum, so as to pump away the air and moisture inside. During the vacuum pumping process, when the vacuum degree is less than the specification requirement, it is maintained for a period of time (generally more than 12h), and then the next step of oil injection operation is carried out after the vacuum degree is maintained for a period of time.

[0004] The main disadvantage of this method is that the drying degree of the inside of the transformer cannot be directly displayed during the vacuum pumping process of the vacuum pump, and the drying degree can only be ensured by continuously pumping for a period of time according to experience, which is not conducive to standardized operation. SUMMARY

[0005] The purpose of the present application is to provide a transformer drying device, which solves the problem that the drying degree of the inside of the transformer cannot be directly displayed when the transformer is pumped to vacuum, which is not conducive to standardized operation.

[0006] The above technical purpose of the present application is realized by the following technical scheme: a transformer drying device, comprising: a base, a buffer tank, a metering tank, a first refrigerator and a second refrigerator are installed on the base; the buffer tank is communicated with an air inlet pipe, an air outlet pipe and a first liquid outlet pipe, the connection point of the air outlet pipe with the buffer tank is located at the top of the buffer tank, and the connection point of the first liquid outlet pipe with the buffer tank is located at the bottom of the buffer tank; the free end of the first liquid outlet pipe is communicated with the top of the metering tank, and the installation height of the buffer tank is higher than the top of the metering tank; the first refrigerator comprises a first condenser, which cools the air in the air inlet pipe; the second refrigerator comprises a second condenser, which cools the air in the air outlet pipe, and the installation height of the second condenser is higher than the top of the buffer tank; a weighing device is installed at the bottom of the base.

[0007] The present application is further provided, wherein the refrigeration temperature range of the first refrigerator is 2-5℃, and the refrigeration temperature range of the second refrigerator is -60-40℃.

[0008] The application is further provided with the second condenser comprising a condensing tank, the condensing tank being provided with an air inlet, an air outlet and a drainage outlet, the drainage outlet being located at the bottom of the condensing tank; the exhaust pipe is cut into two sections from the middle section, the air inlet is communicated with the buffer tank through the first section of the exhaust pipe, the air outlet is communicated with the second section of the exhaust pipe, and the drainage outlet is communicated with the metering tank through the second liquid discharge pipe; the first end plate and the second end plate are fixedly connected in the condensing tank, the first end plate and the second end plate divide the internal space of the condensing tank into the first refrigerant chamber, the heat exchange chamber and the second refrigerant chamber arranged in sequence; the first refrigerant chamber and the second refrigerant chamber are communicated through a plurality of heat exchange pipes, the heat exchange pipes are located in the heat exchange chamber; one end of the drainage outlet is located in the condensing tank and communicated with the heat exchange chamber, and the air inlet and the air outlet are both communicated with the heat exchange chamber; the condensing tank is provided with a refrigerant inlet and a refrigerant outlet, the refrigerant inlet is communicated with the first refrigerant chamber, the refrigerant outlet is communicated with the second refrigerant chamber, and the refrigerant inlet, the first refrigerant chamber, the heat exchange pipe, the second refrigerant chamber and the refrigerant outlet jointly constitute a refrigerant passage for the refrigerant medium of the second refrigerating machine.

[0009] The application is further provided with the third liquid discharge pipe being communicated with the bottom of the metering tank, the first coaxial valve, the water pump and the flowmeter being installed on the third liquid discharge pipe, the water storage tank being communicated with one end of the third liquid discharge pipe away from the metering tank, the exhaust valve being communicated with the top of the water storage tank, the water drain valve being communicated with the bottom of the water storage tank, and the water storage tank being installed on the machine base.

[0010] The application is further provided with the first liquid level sensor and the second liquid level sensor being installed in the metering tank, the first liquid level sensor being installed on the upper section of the metering tank, and the second liquid level sensor being installed on the lower section of the metering tank.

[0011] The application is further provided with the machine base being fixedly connected with the frame body, the metering tank being fixedly connected with the fixed arms on both sides, the metering tank being erected on the frame body through the two fixed arms, and the weighing sensors being arranged between the two fixed arms and the frame body.

[0012] The application is further provided with the dew point sensor being installed on the exhaust pipe.

[0013] In summary, the present application has at least the following beneficial technical effects: when drying the transformer, the exhaust pipe is connected to the vacuum pump, and the air inlet pipe is communicated with the inside of the transformer, and the air inside the transformer is extracted by the vacuum pump. The first refrigeration machine cools the air in the air inlet pipe through the first condenser, thereby condensing part of the moisture in the air, completing the preliminary drying of the air. The preliminarily dried air and the condensed water enter the buffer tank, the condensed water gathers at the bottom of the buffer tank, and flows into the metering tank through the first liquid discharge pipe; the preliminarily dried air enters the exhaust pipe, and the second refrigeration machine cools the exhaust pipe, so that the remaining moisture in the preliminarily dried air is condensed to form condensed water which flows back into the buffer tank. The condensed water produced in the air inlet pipe and the exhaust pipe increases the weight of the metering tank and the overall equipment. The real-time weight of the entire equipment is weighed by the weighing device, and the data weighed by the weighing device is collected and recorded. During the vacuumizing process, when the condensed water no longer increases, the weight of the entire equipment will no longer increase, and the drying degree inside the transformer can be intuitively reflected by observing the weight change displayed by the weighing device. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a system diagram of the embodiment;

[0015] Figure 2 is a longitudinal sectional view of the second condenser in the embodiment;

[0016] Figure 3 is a top view of the flow guide plate in the embodiment.

[0017] In the figure: first refrigeration machine 1, first condenser 2, second refrigeration machine 3, second condenser 4, condensing tank 401, heat exchange pipe 402, air outlet 403, water outlet 404, refrigerant outlet 405, second refrigerant chamber 406, second end plate 407, heat exchange chamber 408, flow guide plate 409, air inlet 410, refrigerant inlet 411, first refrigerant chamber 412, first end plate 413, flow guide hole 414, through hole 415, air inlet pipe 5, branch pipe 6, buffer tank 7, exhaust pipe 8, dew point sensor 9, first liquid discharge pipe 10, second coaxial valve 11, second liquid discharge pipe 12, electromagnetic valve 13, metering tank 14, first liquid level sensor 15, fixed arm 16, weighing sensor 17, second liquid level sensor 18, third liquid discharge pipe 19, first coaxial valve 20, water pump 21, flow meter 22, water storage tank 23, exhaust valve 24, water discharge valve 25. DETAILED DESCRIPTION

[0018] The present application will be further described in detail below with reference to the accompanying drawings.

[0019] A transformer drying device, please refer to Figure 1, including: base and weighing device, weighing device is installed at the bottom of the base, the base can be supported on the ground by the weighing device. The weighing device uses an electronic weighing device in the prior art to weigh the weight of the base and the components installed on the base. The base is installed with a buffer tank 7, a metering tank 14, a first refrigerator 1 and a second refrigerator 3; the buffer tank 7 is communicated with the air inlet pipe 5, the exhaust pipe 8 and the first liquid discharge pipe 10, the connection point of the exhaust pipe 8 with the buffer tank 7 is located at the top of the buffer tank 7, and the connection point of the first liquid discharge pipe 10 with the buffer tank 7 is located at the bottom of the buffer tank 7. The second coaxial valve 11 is arranged on the first liquid discharge pipe 10, the free end of the first liquid discharge pipe 10 is communicated with the top of the metering tank 14, and the installation height of the buffer tank 7 is higher than the top of the metering tank 14, so that the condensed water flows from the bottom of the buffer tank 7 into the metering tank 14. The first refrigerator 1 comprises two first condensers 2, and the air in the air inlet pipe 5 is cooled by the first condenser 2. The air inlet pipe 5 is connected in parallel with the branch pipe 6, and the air in the branch pipe 6 is cooled by the second first condenser 2, and the condensation efficiency of the water in the air in the air inlet pipe 5 is enhanced by the two first condensers. The second refrigerator 3 comprises a second condenser 4, and the air in the exhaust pipe 8 is cooled by the second condenser 4. The installation height of the second condenser 4 is higher than the top of the buffer tank 7, so that the condensed water in the exhaust pipe 8 flows back into the buffer tank 7.

[0020] By adopting the technical scheme of the embodiment, when the transformer is subjected to drying treatment, one end of the exhaust pipe 8 away from the buffer tank 7 is connected with a vacuum pump, the air inlet pipe 5 is communicated with the inside of the transformer, the air inside the transformer is extracted by the vacuum pump, and the second coaxial valve 11 is opened. The first refrigerator 1 cools the air in the air inlet pipe 5 through the first condenser 2, thereby condensing part of the water in the air and completing the preliminary drying of the air. The preliminarily dried air and the condensed water enter the buffer tank 7, the condensed water gathers at the bottom of the buffer tank 7 and flows into the metering tank 14 through the first liquid discharge pipe 10; the preliminarily dried air enters the exhaust pipe 8 and is cooled by the second refrigerator 3, so that the remaining water in the preliminarily dried air is condensed to form condensed water which flows back into the buffer tank 7. The condensed water generated in the air inlet pipe 5 and the exhaust pipe 8 increases the weight of the metering tank 14 and the whole device. The real-time weight of the whole device is weighed by the weighing device, and the data measured by the weighing device is collected and recorded. During the vacuumizing process, when the condensed water no longer increases, the weight of the whole device will no longer increase, and the drying degree of the inside of the transformer can be directly reflected by observing the weight change displayed by the weighing device.

[0021] On the basis of the technical scheme of the above embodiment, further, the refrigeration temperature range of the first refrigerator 1 is 2 degrees Celsius to 5 degrees Celsius, and the refrigeration temperature range of the second refrigerator 3 is -60 degrees Celsius to -40 degrees Celsius.

[0022] By adopting the technical scheme of the embodiment, since the refrigeration temperature range of the first refrigerating machine 1 is 2-5 degrees Celsius, the moisture in the air in the air inlet pipe 5 is easy to partially condense to form condensed water. Since the refrigeration temperature range of the second refrigerating machine 3 is -60 to -40 degrees Celsius, the temperature is lower, and the condensation speed of the moisture is faster, which further condenses the remaining moisture in the preliminarily dried air in the air outlet pipe 8. The moisture in the air is better recovered, and the precision of the condensed water weight change metering is further improved.

[0023] Please refer to Figure 2 and Figure 3In the technical scheme of the above embodiment, further, the second condenser 4 comprises a condensing tank 401, the condensing tank 401 is fixedly connected with a first end plate 413 and a second end plate 407, the first end plate 413 is located above the second end plate 407, and the first end plate 413 and the second end plate 407 divide the internal space of the condensing tank 401 into a first refrigerant chamber 412, a heat exchange chamber 408 and a second refrigerant chamber 406 arranged in sequence from top to bottom. The first refrigerant chamber 412 and the second refrigerant chamber 406 are communicated through a plurality of heat exchange pipes 402, the plurality of heat exchange pipes 402 are arranged at intervals, and the heat exchange pipes 402 are located in the heat exchange chamber 408. The condensing tank 401 is provided with an air inlet 410, an air outlet 403 and a drainage port 404. The air inlet 410 is located at the upper right side of the condensing tank 401, the air outlet 403 is located at the lower left side of the condensing tank 401, and the air inlet 410 and the air outlet 403 are both communicated with the heat exchange chamber 408. The air outlet 403 can be arranged at a distance of 5-10 cm from the second end plate 407 to prevent the condensed water in the heat exchange chamber 408 from entering the air outlet 403. The drainage port 404 is located at the bottom of the condensing tank 401, and the upper end of the drainage port 404 is located in the condensing tank 401 and communicated with the heat exchange chamber 408. Two guide plates 409 can be arranged in the condensing tank 401, the two guide plates 409 are arranged at intervals from top to bottom, the guide plates 409 are provided with through holes 415 for the heat exchange pipes 402 to pass through, and the guide plates 409 are also provided with guide holes 414. From top to bottom, the guide holes 414 of the first guide plate 409 are located on the left side, and the guide holes 414 of the second guide plate 409 are located on the right side, so that the flow path of the gas between the air inlet 410 and the air outlet 403 is longer, the gas can stay for a longer time, and the condensing effect is improved. The exhaust pipe 8 is cut into two sections at the middle section, the air inlet 410 is communicated with the buffer tank 7 through the first section of the exhaust pipe 8, the air outlet 403 is communicated with the second section of the exhaust pipe 8, the drainage port 404 is communicated with the metering tank 14 through the second liquid discharge pipe 12; the condensing tank 401 is provided with a refrigerant inlet 411 and a refrigerant outlet 405, the refrigerant inlet 411 is communicated with the first refrigerant chamber 412, the refrigerant outlet 405 is communicated with the second refrigerant chamber 406, and the refrigerant inlet 411, the first refrigerant chamber 412, the heat exchange pipes 402, the second refrigerant chamber 406 and the refrigerant outlet 405 jointly constitute a refrigerant passage for the refrigerant of the second refrigerating machine 3.

[0024] By adopting the technical scheme of the embodiment, since the refrigeration temperature range of the second refrigerating machine 3 is -60 degrees Celsius to -40 degrees Celsius, if only the exhaust pipe 8 is cooled by the conventional condenser, the condensed water in the exhaust pipe 8 is easy to freeze, thereby blocking the exhaust pipe 8. In the present scheme, the preliminarily dried air in the air inlet pipe 5 enters the buffer tank 7, the preliminarily dried air in the buffer tank 7 enters the condensing tank 401 of the second condenser 4 through the exhaust pipe 8 and the air inlet 410, and then is discharged through the air outlet 403. The refrigeration medium of the second refrigerating machine 3 enters the first refrigerant chamber 412 through the refrigerant inlet 411, then enters the second refrigerant chamber 406 through the heat exchange pipe 402, and finally flows back to the related components of the refrigerating machine from the refrigerant outlet 405. The moisture in the preliminarily dried air in the condensing tank 401 is cooled by the heat exchange pipe 402, and the condensed water generated flows into the metering tank 14 through the drain port 404 and the second liquid discharge pipe 12. Part of the condensed water freezes and remains in the condensing tank 401. Since the space of the heat exchange chamber 408 of the condensing tank 401 is large, it is difficult to block the passage between the air inlet 410 and the air outlet 403, thereby avoiding the situation that the exhaust pipe 8 is blocked due to the freezing of the condensed water.

[0025] Please continue to refer to Figure 1 On the basis of the technical scheme of the above embodiment, further, the bottom of the metering tank 14 is communicated with a third liquid discharge pipe 19, the first coaxial valve 20, the water pump 21 and the flowmeter 22 are installed on the third liquid discharge pipe 19, the end of the third liquid discharge pipe 19 away from the metering tank 14 is communicated with a water storage tank 23, the top of the water storage tank 23 is communicated with a gas exhaust valve 24, the bottom of the water storage tank 23 is communicated with a water drain valve 25, and the water storage tank 23 is installed on the machine base.

[0026] By adopting the technical scheme of the embodiment, the first coaxial valve 20 is opened at regular time intervals, the water in the metering tank 14 is pumped into the water storage tank 23 through the water pump 21, and the flow of the pumped condensed water is detected by the flowmeter 22 to record the flow data of the condensed water pumped from the metering tank 14. After all the water in the metering tank 14 is discharged, the total amount of the condensed water is calculated through the flow data, so as to compare with the data recorded by the weighing device, thereby further verifying the accuracy of the data. When the water storage tank 23 is full, the water in the water storage tank 23 can be discharged through the water drain valve 25.

[0027] On the basis of the technical scheme of the above embodiment, further, the first liquid level sensor 15 and the second liquid level sensor 18 are installed in the metering tank 14, the first liquid level sensor 15 is installed in the upper section of the metering tank 14, and the second liquid level sensor 18 is installed in the lower section of the metering tank 14.

[0028] By adopting the technical scheme of the embodiment, since the condensate water in the metering tank 14 is closed in the metering tank 14, the water level is inconvenient to observe, and thus it is inconvenient to know when to drain the water in the metering tank 14. In the scheme, after the condensate water level in the metering tank 14 is detected to be higher than the height of the first liquid level sensor 15 by the first liquid level sensor 15, the first coaxial valve 20 is opened and the water pump 21 is started to drain the condensate water in the metering tank 14 through the third liquid discharge pipe 19. When the condensate water in the metering tank 14 is lower than the height of the second liquid level sensor 18, the water pump 21 is closed and the first coaxial valve 20 is closed. The condensate water level in the metering tank 14 is conveniently judged, and thus it is convenient to judge when to perform the water draining operation.

[0029] On the basis of the technical scheme of the above embodiment, further, the frame body is fixedly connected to the base, the two sides of the metering tank 14 are fixedly connected with the fixed arms 16, and the metering tank 14 is erected on the frame body through the two fixed arms 16. The weighing sensor 17 is arranged between the two fixed arms 16 and the frame body.

[0030] By adopting the technical scheme of the embodiment, since the weighing sensor 17 detects the weight change of the metering tank 14, the weight detection error is large, the data of the weight change of the metering tank 14 is analyzed, and the data is compared with the data detected by the weighing sensor 17, so as to further verify the accuracy of the weighing data.

[0031] On the basis of the technical scheme of the above embodiment, further, the dew point sensor 9 is installed on the exhaust pipe 8. The dryness degree of the gas in the exhaust pipe 8 is detected by the dew point sensor 9, so as to further verify the dryness degree inside the transformer.

[0032] The specific embodiment is only an explanation of the application, and is not a limitation of the application. Those skilled in the art can make non-creative modification to the embodiment according to the needs after reading the specification, and the application is protected by the patent law as long as it is within the scope of the claims.

Claims

1. A transformer drying apparatus, characterized by, The application relates to a refrigeration device for air drying, which comprises a base, a buffer tank, a metering tank, a first refrigeration machine and a second refrigeration machine mounted on the base; the buffer tank is communicated with an air inlet pipe, an air outlet pipe and a first liquid outlet pipe; the connecting point of the air outlet pipe with the buffer tank is located at the top of the buffer tank; the connecting point of the first liquid outlet pipe with the buffer tank is located at the bottom of the buffer tank; the free end of the first liquid outlet pipe is communicated with the top of the metering tank; the installation height of the buffer tank is higher than the top of the metering tank; the bottom of the metering tank is communicated with a third liquid outlet pipe; a first coaxial valve, a water pump and a flowmeter are mounted on the third liquid outlet pipe; the end of the third liquid outlet pipe away from the metering tank is communicated with a water storage tank; the top of the water storage tank is communicated with an air outlet valve; the bottom of the water storage tank is communicated with a water outlet valve; the water storage tank is mounted on the base. The first refrigeration machine comprises a first condenser for refrigerating the air in the air inlet pipe; the end of the air outlet pipe away from the buffer tank is connected with a vacuum pump; the air inlet pipe is communicated with the inside of a transformer; the initially dried air enters the air outlet pipe; the second refrigeration machine comprises a second condenser for refrigerating the air in the air outlet pipe so that the remaining moisture in the initially dried air is condensed to form condensed water which flows back into the buffer tank; the installation height of the second condenser is higher than the top of the buffer tank. The second condenser comprises a condensing tank which is provided with an air inlet, an air outlet and a water outlet; the water outlet is located at the bottom of the condensing tank; the air outlet pipe is cut into two sections at the middle section; the air inlet is communicated with the buffer tank through the first section of the air outlet pipe; the air outlet is communicated with the second section of the air outlet pipe; the water outlet is communicated with the metering tank through the second liquid outlet pipe; the condensing tank is fixedly connected with a first end plate and a second end plate; the first end plate and the second end plate divide the internal space of the condensing tank into a first refrigerant chamber, a heat exchange chamber and a second refrigerant chamber which are arranged in sequence; the first refrigerant chamber and the second refrigerant chamber are communicated through a plurality of heat exchange pipes which are located in the heat exchange chamber; one end of the water outlet is located in the condensing tank and is communicated with the heat exchange chamber; the air inlet and the air outlet are both communicated with the heat exchange chamber; the condensing tank is provided with a refrigerant inlet and a refrigerant outlet; the refrigerant inlet is communicated with the first refrigerant chamber; the refrigerant outlet is communicated with the second refrigerant chamber; the refrigerant inlet, the first refrigerant chamber, the heat exchange pipes, the second refrigerant chamber and the refrigerant outlet jointly form a refrigerant passage for the refrigeration medium of the second refrigeration machine. A weighing device is mounted on the bottom of the base.

2. A transformer drying apparatus as claimed in claim 1, wherein The refrigeration temperature range of the first refrigeration machine is 2-5 DEG C; the refrigeration temperature range of the second refrigeration machine is -60- -40 DEG C.

3. The transformer drying apparatus of claim 1, wherein A first liquid level sensor and a second liquid level sensor are mounted in the metering tank; the first liquid level sensor is mounted on the upper section of the metering tank; the second liquid level sensor is mounted on the lower section of the metering tank.

4. The transformer drying apparatus of claim 1, wherein The frame body is fixedly connected to the base, the metering tank is fixedly connected with the fixed arms on both sides, the metering tank is erected on the frame body through the two fixed arms, and the weighing sensor is arranged between the two fixed arms and the frame body.

5. The transformer drying apparatus of claim 1, wherein The dew point sensor is installed on the exhaust pipe.

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