Spraying apparatus and drying method

Abstract

The application provides a spraying device and a drying method, the spraying device comprises a heat exchanger, an oil inlet of the heat exchanger is used for being communicated with an oil outlet of an oil tank of a transformer, so that oil liquid in the oil tank after heating the body of the transformer enters the heat exchanger, and an oil outlet of the heat exchanger is communicated with an oil inlet of the oil tank, so that the oil liquid in the heat exchanger after heating enters the oil tank, and the body of the transformer in the oil tank is heated and dried. The spraying device of the application adopts a combination mode with the transformer, uses the oil liquid in the oil tank of the transformer for heating, and heats and dries the body of the transformer in the oil tank. The structure of the spraying device of the application is relatively simple, and the problem of the complex structure of the spraying system for the transformer in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of transformer drying technology, and more specifically, to a spraying device and a drying method. Background Technology

[0002] The insulation performance and aging rate of a transformer are closely related to the moisture content of the insulation components inside the transformer. The higher the moisture content of the insulation components, the worse the insulation performance and the faster the aging rate.

[0003] Currently, the requirements for the moisture content of transformer insulation components are becoming increasingly stringent. Generally, the moisture content of insulation components is required to be ≤1% when leaving the factory, and some export products even require the moisture content of insulation components to be ≤0.5%. Before leaving the factory, the moisture content of insulation components can be measured using the "DLT580-2013 Method for Determining the Average Moisture Content in Transformer Insulation Paper by Dew Point Method".

[0004] During assembly, after the transformer is dried and removed from the drying tank, it is exposed to air, and the insulation components continuously absorb moisture, making it difficult to control the moisture content below 0.5%. When the dew point measurement results are unqualified, drying treatment is required to remove excess moisture from the insulation components.

[0005] Currently, the main methods for drying transformers include hot oil circulation, vacuuming, and re-drying the transformer after removing oil. Among these methods, vacuuming is time-consuming and ineffective, while re-drying requires additional disassembly and reassembly, resulting in a long processing cycle and high costs.

[0006] Due to site limitations, the user has adopted a hot oil spray drying process. However, the existing spray system consists of multiple devices such as a vacuum oil filter, heater, sprayer, negative pressure pump, air dryer, and dew point meter. Before use, the pipelines of multiple devices must be connected. Therefore, the existing spray system is relatively fragmented, complicated to install, and has a cumbersome process. In addition, the existing spray system requires independent layout and occupies a large area. Summary of the Invention

[0007] The main objective of this invention is to provide a spraying device and a drying method to solve the problem of complex structure in existing spraying systems for transformers.

[0008] To achieve the above objectives, according to one aspect of the present invention, a spraying device is provided, comprising a heat exchanger, wherein the oil inlet of the heat exchanger is connected to the oil outlet of the transformer tank so that the oil in the tank that has heated the transformer body enters the heat exchanger; and the oil outlet of the heat exchanger is connected to the oil inlet of the tank so that the heated oil in the heat exchanger enters the tank to heat and dry the transformer body located in the tank.

[0009] Furthermore, the spraying equipment also includes: a steam generator, the steam outlet of which is connected to the steam inlet of the heat exchanger to provide saturated steam as a heat exchange medium to the heat exchanger; and / or an oil supply pump, which is installed on the pipeline between the oil outlet of the oil tank and the oil inlet of the heat exchanger.

[0010] Furthermore, the spraying equipment also includes: a first filter, which is installed on the pipeline between the steam outlet of the steam generator and the steam inlet of the heat exchanger; and / or a regulating valve, which is installed on the pipeline between the steam outlet of the steam generator and the steam inlet of the heat exchanger, and controls the amount of saturated steam supplied to the heat exchanger within a set time period by controlling the opening degree of the regulating valve, thereby controlling the temperature at which the oil in the heat exchanger is heated within the set time period; and / or a water storage component, the outlet of which is connected to the water inlet of the steam generator to supply water to the steam generator; and / or a second filter, which is installed on the pipeline between the oil supply pump and the oil outlet of the oil tank.

[0011] Furthermore, the return port of the water storage component is connected to the outlet of the heat exchanger, so that the condensate formed after the saturated steam in the heat exchanger heats the oil enters the water storage component through the outlet of the heat exchanger and the return port of the water storage component; and / or a water pump is installed on the pipeline between the outlet of the water storage component and the inlet of the steam generator.

[0012] Furthermore, a drain valve is installed on the pipeline between the return port of the water storage component and the outlet of the heat exchanger, so as to control the opening and closing of the pipeline between the return port of the water storage component and the outlet of the heat exchanger by opening or closing the drain valve.

[0013] Furthermore, the spraying equipment also includes: a first temperature detection component, which is installed on a pipeline connected to the oil inlet of the heat exchanger to detect the temperature of the oil entering the heat exchanger; and / or a second temperature detection component, which is installed on a pipeline connected to the oil outlet of the heat exchanger to detect the temperature of the oil flowing out of the oil outlet of the heat exchanger; and / or a flow meter, which is installed on a pipeline between the oil outlet of the heat exchanger and the oil inlet of the oil tank.

[0014] Furthermore, the spraying equipment also includes a control unit, a first temperature detection component, a second temperature detection component, and a regulating valve, all of which are communicatively connected to the control unit, so that the control unit can obtain the oil temperature information detected by the first temperature detection component and the oil temperature information detected by the second temperature detection component, and control the opening degree of the regulating valve according to the obtained oil temperature information.

[0015] Furthermore, the spraying equipment also includes a spray head, the oil inlet of which is connected to the oil outlet of the heat exchanger, and the oil outlet of which is connected to the oil inlet of the oil tank; the oil outlet of the spray head includes multiple spaced oil outlet holes, so that the oil in the spray head is sprayed into the oil tank through the multiple oil outlet holes.

[0016] According to another aspect of the present invention, a drying method is provided, applicable to the above-mentioned spraying equipment. The drying method includes: step S100: evacuating the transformer tank to bring it into a full vacuum state; step S200: injecting oil into the transformer tank under full vacuum to bring the oil level in the tank to a predetermined height; step S300: filling the transformer tank with dry air to raise the internal pressure to a predetermined pressure value and maintain a negative pressure state inside the tank; step S400: turning on the spraying equipment and spraying oil into the transformer tank for a first time period; step S500: turning off the spraying equipment, filling the transformer tank with dry air, and measuring the dew point of the air inside the tank.

[0017] Furthermore, after the spray equipment is turned off and before dry air is introduced into the transformer tank, the drying method further includes: evacuating the transformer tank so that the internal vacuum level of the transformer tank is less than or equal to a predetermined value and maintaining it for a second time period; and / or in step S400, during the process of heating the transformer body using the spray equipment, monitoring the internal pressure of the transformer tank so that the internal pressure of the tank is maintained at a predetermined pressure value, thereby maintaining a negative pressure state inside the tank.

[0018] Furthermore, the predetermined height ranges from 1m to 1.5m; and / or the predetermined pressure ranges from -0.04MPa to -0.06MPa; and / or the dew point of the dry air introduced into the transformer's oil tank ranges from less than or equal to -65℃; and / or when the temperature of the oil flowing out of the heat exchanger of the spray equipment is 110℃ to 120℃, the first time period is 16h.

[0019] Furthermore, the predetermined value ranges from 50 Pa to 16 hours.

[0020] According to the technical solution of this invention, the spraying equipment includes a heat exchanger. The oil inlet of the heat exchanger is connected to the oil outlet of the transformer's oil tank, so that the oil in the transformer's oil tank, after heating and drying the transformer body, enters the heat exchanger. The heat exchanger heats the oil entering the heat exchanger, thereby heating the oil to a specified temperature. The oil outlet of the heat exchanger is connected to the oil inlet of the transformer's oil tank, so that the heated oil in the heat exchanger enters the transformer's oil tank to heat and dry the transformer body located in the oil tank. The spraying equipment of this application adopts a method of integration with the transformer, utilizing the heating of the oil in the transformer's oil tank to heat and dry the transformer body located in the oil tank. This structural arrangement makes the structure of the spraying equipment of this application relatively simple, solving the problem of complex structure in the prior art spraying systems used for transformers. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 A schematic diagram of the spraying device according to the present invention is shown;

[0023] Figure 2 A side view of the spraying device according to the present invention is shown from a first perspective;

[0024] Figure 3 A side view of the spraying device according to the present invention is shown from a second perspective;

[0025] Figure 4 A third-angle side view of the spraying device according to the present invention is shown;

[0026] Figure 5 A schematic diagram of the interaction between the spraying device and the transformer according to the present invention is shown.

[0027] The above figures include the following reference numerals:

[0028] 100. Spraying equipment;

[0029] 10. Heat exchanger; 20. Steam generator; 21. First filter; 22. First pipeline; 23. Regulating valve; 30. Water storage unit; 31. Feed pump; 32. Second pipeline; 33. Steam trap; 34. Third pipeline; 41. Oil supply pump; 42. Fourth pipeline; 421. First pipe section; 422. Second pipe section; 43. Second filter; 44. First temperature detection unit; 45. Second temperature detection unit; 46. Fifth pipeline; 47. Flow meter; 50. Spray head; 60. Control unit;

[0030] 200. Transformer; 210. Vacuum unit; 220. Dry air generator. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0034] This invention provides a spraying device 100, please refer to... Figures 1 to 4 The spraying device 100 includes a heat exchanger 10. The oil inlet of the heat exchanger 10 is connected to the oil outlet of the oil tank of the transformer 200, so that the oil in the oil tank of the transformer 200, after heating and drying the transformer body, enters the heat exchanger 10. The heat exchanger 10 heats the oil entering the heat exchanger 10 to a specified temperature. The oil outlet of the heat exchanger 10 is connected to the oil inlet of the oil tank of the transformer 200, so that the heated oil in the heat exchanger 10 enters the oil tank of the transformer 200 to heat and dry the transformer body located in the oil tank. The spraying device 100 of this application is integrated with the transformer 200, using the heating of the oil in the oil tank of the transformer 200 to heat and dry the transformer body located in the oil tank. This structural arrangement makes the structure of the spraying device 100 of this application relatively simple, solving the problem of complex structure of the existing spraying system for transformers.

[0035] It should be noted that the heat exchanger 10 has an oil inlet and an oil outlet, and the oil tank of the transformer 200 has an oil inlet and an oil outlet.

[0036] Specifically, heat exchanger 10 is a plate heat exchanger, which has fast heating speed, high heating temperature and precise heating temperature control.

[0037] Specifically, the oil outlet of the oil tank of transformer 200 is located at the lower part of transformer 200, and the oil inlet of the oil tank of transformer 200 is located at the upper part of transformer 200.

[0038] Specifically, the heat exchange medium of heat exchanger 10 is saturated steam.

[0039] In this embodiment, the spraying device 100 further includes a steam generator 20, the steam outlet of which is connected to the steam inlet of the heat exchanger 10 to provide saturated steam to the heat exchanger 10, and the saturated steam is used as a heat exchange medium.

[0040] Optionally, the steam generator 20 is an electrically heated steam generator.

[0041] Specifically, a first filter 21 is installed on the pipeline between the steam outlet of the steam generator 20 and the steam inlet of the heat exchanger 10 to filter the steam to be introduced into the heat exchanger 10.

[0042] Specifically, the spraying equipment 100 also includes a first pipeline 22 disposed between the steam outlet of the steam generator 20 and the steam inlet of the heat exchanger 10. The two ports of the first pipeline 22 are respectively connected to and communicate with the steam outlet of the steam generator 20 and the steam inlet of the heat exchanger 10, so that the steam outlet of the steam generator 20 is connected to the steam inlet of the heat exchanger 10.

[0043] Specifically, a first filter 21 is installed on the first pipeline 22 to filter the steam inside the first pipeline 22. Optionally, the first filter 21 is a Y-type filter.

[0044] Specifically, a regulating valve 23 is installed on the pipeline between the steam outlet of the steam generator 20 and the steam inlet of the heat exchanger 10. By controlling the opening of the regulating valve 23, the instantaneous flow rate of steam through the pipeline between the steam outlet of the steam generator 20 and the steam inlet of the heat exchanger 10 is controlled, thereby controlling the amount of saturated steam supplied to the heat exchanger 10 within a set time period, and thus controlling the temperature at which the oil in the heat exchanger 10 is heated within the set time period.

[0045] Specifically, the regulating valve 23 is installed on the first pipeline 22, and the instantaneous flow rate of steam through the first pipeline 22 is controlled by controlling the opening degree of the regulating valve 23.

[0046] In this embodiment, the spraying device 100 further includes a water storage component 30. The outlet of the water storage component 30 is connected to the inlet of the steam generator 20 to supply water to the steam generator 20, thereby enabling the steam generator 20 to heat the water entering it to form saturated steam. The return outlet of the water storage component 30 is connected to the outlet of the heat exchanger 10, so that the saturated steam in the heat exchanger 10 heats the oil in the heat exchanger 10 to form condensate. The condensate in the heat exchanger 10 enters the water storage component 30 through the outlet of the heat exchanger 10 and the return outlet of the water storage component 30 for recycling.

[0047] It should be noted that ordinary tap water contains calcium. + Mg + In contrast, ordinary tap water, after heating, forms substances such as CaCO3 that adhere to the inner wall of the steam generator 20. Long-term use of fresh tap water to heat steam leads to the accumulation of large amounts of CaCO3 on the inner wall of the steam generator 20, resulting in scale buildup. This not only affects heating efficiency and increases energy consumption but can also corrode the inner wall of the steam generator 20, ultimately causing equipment damage. However, this application reuses distilled water, the liquid water condensed from steam. Since this water no longer contains various ions, CaCO3 will only accumulate after the first heating. Afterward, no new CaCO3 will form, resulting in only slight scaling and preventing large-scale accumulation on the inner wall of the steam generator 20. This, in turn, helps extend the service life of the steam generator 20.

[0048] Specifically, the water storage component 30 is used to store tap water, and the water storage component 30 is a water storage tank.

[0049] Specifically, a water pump 31 is installed on the pipeline between the outlet of the water storage component 30 and the inlet of the steam generator 20 to pump water from the water storage component 30 into the steam generator 20.

[0050] Specifically, the spraying equipment 100 also includes a second pipeline 32 disposed between the outlet of the water storage component 30 and the inlet of the steam generator 20. The two ports of the second pipeline 32 are respectively connected to and communicate with the outlet of the water storage component 30 and the inlet of the steam generator 20, so that the outlet of the water storage component 30 and the inlet of the steam generator 20 are connected; the water pump 31 is disposed on the second pipeline 32.

[0051] Specifically, a drain valve 33 is installed on the pipeline between the return port of the water storage component 30 and the outlet of the heat exchanger 10, so as to control the opening and closing of the pipeline between the return port of the water storage component 30 and the outlet of the heat exchanger 10 by opening or closing the drain valve 33.

[0052] Specifically, the spraying equipment 100 also includes a third pipeline 34 disposed between the return water inlet of the water storage component 30 and the outlet of the heat exchanger 10. The two ports of the third pipeline 34 are respectively connected to and communicate with the return water inlet of the water storage component 30 and the outlet of the heat exchanger 10, so that the return water inlet of the water storage component 30 and the outlet of the heat exchanger 10 are connected. A drain valve 33 is disposed on the third pipeline 34 to control the opening and closing of the third pipeline 34.

[0053] In this embodiment, an oil supply pump 41 is installed on the pipeline between the oil outlet of the transformer 200's oil tank and the oil inlet of the heat exchanger 10 to pump the oil to be heated in the transformer 200's oil tank into the heat exchanger 10.

[0054] Specifically, the oil supply pump 41 is a canned pump.

[0055] Specifically, the spraying equipment 100 also includes a fourth pipeline 42, which is located between the oil outlet of the transformer 200's oil tank and the oil inlet of the heat exchanger 10. The two ports of the fourth pipeline 42 are respectively connected to the oil outlet of the transformer 200's oil tank and the oil inlet of the heat exchanger 10, so that the oil outlet of the transformer 200's oil tank and the oil inlet of the heat exchanger 10 are connected. The oil supply pump 41 is installed on the fourth pipeline 42.

[0056] Specifically, a second filter 43 is installed on the pipeline between the oil supply pump 41 and the oil outlet of the transformer 200's oil tank to filter the oil entering the oil supply pump 41. Optionally, the second filter 43 is a Y-type filter.

[0057] Specifically, the oil supply pump 41 divides the fourth pipeline 42 into a first pipeline section 421 and a second pipeline section 422 that are interconnected. The first pipeline section 421 is located between the oil supply pump 41 and the oil outlet of the oil tank of the transformer 200, and the second pipeline section 422 is located between the oil supply pump 41 and the oil inlet of the heat exchanger 10. The second filter 43 is installed on the first pipeline section 421 to filter the oil in the first pipeline section 421.

[0058] In this embodiment, a first temperature detection component 44 is provided on the pipeline connected to the oil inlet of the heat exchanger 10 to detect the temperature of the oil entering the heat exchanger 10. Optionally, the first temperature detection component 44 is a thermocouple.

[0059] Specifically, a first temperature detection component 44 is installed on the pipeline between the oil supply pump 41 and the oil inlet of the heat exchanger 10 to detect the oil temperature in the pipeline between the oil supply pump 41 and the oil inlet of the heat exchanger 10, thereby realizing the detection of the oil temperature entering the heat exchanger 10; that is, the first temperature detection component 44 is installed on the second pipe section 422 to detect the oil temperature in the second pipe section 422.

[0060] In this embodiment, the oil inlet of the heat exchanger 10 and the fourth pipeline 42 are connected by a flexible pipe to avoid a rigid connection.

[0061] Specifically, the flexible pipe is a corrugated pipe; for example, the flexible pipe is a metal corrugated pipe.

[0062] In this embodiment, a second temperature detection component 45 is provided on the pipeline connected to the oil outlet of the heat exchanger 10 to detect the temperature of the oil flowing out of the oil outlet of the heat exchanger 10. Optionally, the second temperature detection component 45 is a thermocouple.

[0063] Specifically, a second temperature detection component 45 is installed on the pipeline between the oil outlet of the heat exchanger 10 and the oil inlet of the oil tank of the transformer 200 to detect the oil temperature in the pipeline between the oil outlet of the heat exchanger 10 and the oil inlet of the oil tank of the transformer 200, thereby realizing the detection of the oil temperature flowing out of the oil outlet of the heat exchanger 10.

[0064] Specifically, the spraying equipment 100 also includes a fifth pipeline 46, which is located between the oil outlet of the heat exchanger 10 and the oil inlet of the oil tank of the transformer 200. The two ports of the fifth pipeline 46 are respectively connected to and communicate with the oil outlet of the heat exchanger 10 and the oil inlet of the oil tank of the transformer 200, so that the oil outlet of the heat exchanger 10 and the oil inlet of the oil tank of the transformer 200 are connected. The second temperature detection component 45 is installed on the fifth pipeline 46 to detect the oil temperature in the fifth pipeline 46.

[0065] Specifically, a flow meter 47 is installed on the pipeline between the oil outlet of the heat exchanger 10 and the oil inlet of the oil tank of the transformer 200 to detect the oil flow rate in the pipeline between the oil outlet of the heat exchanger 10 and the oil inlet of the oil tank of the transformer 200; that is, the flow meter 47 is installed on the fifth pipeline 46 to detect the oil flow rate in the fifth pipeline 46.

[0066] In this embodiment, the spraying device 100 also includes a spray head 50. The oil inlet of the spray head 50 is connected to the oil outlet of the heat exchanger 10, and the oil outlet of the spray head 50 is connected to the oil inlet of the oil tank of the transformer 200. That is, the oil outlet of the heat exchanger 10 is connected to the oil inlet of the oil tank through the spray head 50.

[0067] Specifically, the oil outlet of the spray head 50 includes multiple spaced oil outlet holes, so that the oil entering the spray head 50 is sprayed into the oil tank through the multiple oil outlet holes. In this way, during the process of the oil entering the oil tank, the contact area between the oil and the inner wall of the oil tank can be increased, thereby increasing the heat exchange area between the oil and the transformer body of the transformer 200, and thus increasing the heating efficiency of the transformer body of the transformer 200.

[0068] Optionally, the spray head 50 adopts a mesh structure, and the multiple meshes of the spray head 50 form multiple oil outlet holes.

[0069] Specifically, the oil outlet of the spray head 50 is connected to the inlet of the pipe joint, and the outlet of the pipe joint is connected to the oil inlet of the oil tank, so that the oil outlet of the spray head 50 is connected to the oil inlet of the oil tank through the pipe joint; wherein, the pipe joint is the pipe joint of the heat dissipation component of the transformer 200.

[0070] Specifically, a connecting valve is provided at the connection between the oil outlet of the spray head 50 and the inlet of the pipe connector. The two ports of the connecting valve are connected and communicate with the oil outlet of the spray head 50 and the inlet of the pipe connector, respectively. The connecting valve can be turned on and off to control the on / off state between the oil outlet of the spray head 50 and the inlet of the pipe connector. Optionally, the connecting valve is a butterfly valve.

[0071] In this embodiment, the opening degree of the regulating valve 23 is controlled based on the temperature difference between the oil temperature detected by the first temperature detection component 44 and the oil temperature detected by the second temperature detection component 45.

[0072] In this embodiment, the spraying device 100 further includes a control unit 60, which is communicatively connected to the first temperature detection component 44 to obtain the oil temperature information detected by the first temperature detection component 44, i.e., the first oil temperature; the control unit 60 is communicatively connected to the second temperature detection component 45 to obtain the oil temperature information detected by the second temperature detection component 45, i.e., the second oil temperature; the control unit 60 is communicatively connected to the regulating valve 23, and the control unit 60 controls the opening degree of the regulating valve 23 according to the oil temperature information detected by the first temperature detection component 44 and the oil temperature information detected by the second temperature detection component 45.

[0073] Specifically, the control unit 60 calculates the oil temperature difference between the first oil temperature and the second oil temperature based on the oil temperature information detected by the first temperature detection unit 44 and the oil temperature information detected by the second temperature detection unit 45, and controls the opening degree of the regulating valve 23 based on the calculated oil temperature difference.

[0074] Specifically, the control unit 60 is communicatively connected to the heat exchanger 10 to control the start-up and shutdown of the heat exchanger 10; the control unit 60 is communicatively connected to the steam generator 20 to control the start-up and shutdown of the steam generator 20; the control unit 60 is communicatively connected to the first filter 21 to control the start-up and shutdown of the first filter 21; the control unit 60 is communicatively connected to the feed water pump 31 to control the start-up and shutdown of the feed water pump 31; the control unit 60 is communicatively connected to the drain valve 33 to control the opening or closing of the drain valve 33; the control unit 60 is communicatively connected to the oil supply pump 41 to control the start-up and shutdown of the oil supply pump 41; the control unit 60 is communicatively connected to the second filter 43 to control the start-up and shutdown of the second filter 43; and the control unit 60 is communicatively connected to the flow meter 47 to obtain the oil flow rate information detected by the flow meter 47.

[0075] The present invention also provides a drying method applicable to the above-mentioned spraying equipment 100, please refer to the reference. Figure 5 The drying method includes:

[0076] Step S100: Vacuum the transformer tank to bring it into a full vacuum state; specifically, use vacuum unit 210 to vacuum the transformer tank.

[0077] Step S200: Inject oil into the oil tank of the transformer, which is in a state of full vacuum, so that the oil in the transformer oil tank reaches a predetermined height; specifically, use a vacuum oil filter to inject oil into the transformer oil tank under vacuum; the predetermined height ranges from 1m to 1.5m, that is, the height of the oil level inside the oil tank from the bottom of the oil tank ranges from 1m to 1.5m.

[0078] Step S300: Dry air is introduced into the transformer tank to raise the internal pressure of the transformer tank to a predetermined pressure value and maintain the internal pressure of the transformer tank under negative pressure. Specifically, a dry air generator 220 is used to introduce dry air into the transformer tank. The predetermined pressure value ranges from -0.04MPa to -0.06MPa.

[0079] It should be noted that when the transformer tank is in a state of complete vacuum, the pressure inside the tank is -0.1 MPa; absolute vacuum is -0.1013 MPa, and one standard atmosphere is 0 MPa. Therefore, based on standard atmospheric pressure, when the transformer tank is in a state of complete vacuum, the inside of the tank is under negative pressure; when the pressure inside the tank is between -0.04 MPa and -0.06 MPa, the inside of the tank is also under negative pressure.

[0080] It should be noted that filling the transformer tank with dry air can prevent the transformer from getting damp due to air intake. Filling the transformer tank with dry air allows the oil in the tank to heat the transformer body through heat conduction, further improving the heating efficiency of the transformer body. In this case, the dry air acts as a heat transfer medium. At the same time, the tank is kept under negative pressure. The transformer body is located inside the tank, meaning that the water vapor pressure on the transformer body is greater than the pressure of the external environment (i.e., inside the tank). This pressure difference causes water vapor on the transformer body to transfer from the high-pressure area to the low-pressure area, that is, water vapor transfers from the transformer body to the air inside the tank. The greater the pressure difference, the faster the water vapor transfers from the transformer body to the air inside the tank, thereby accelerating the evaporation rate of water vapor on the transformer body and thus accelerating the drying rate of the transformer body.

[0081] Specifically, the dew point of the dry air introduced into the transformer's oil tank is less than or equal to -65°C to ensure that the pressure inside the oil tank is between -0.02MPa and -0.03MPa.

[0082] Step S400: Turn on the spraying equipment 100 and spray the first time period of oil into the transformer tank to heat and dry the transformer body; during the process of spraying oil into the transformer tank, keep the internal pressure of the tank in a negative pressure state.

[0083] Specifically, when the oil temperature flowing out of the outlet of the heat exchanger 10 of the spraying equipment 100 is 110°C to 120°C, even if the oil temperature flowing out of the outlet of the heat exchanger 10 is set to 115°C ± 5°C, the oil temperature at the inlet of the oil tank of the transformer 200 is 100°C, and the first time period is 16 hours.

[0084] In the specific implementation process, during the process of spraying oil into the transformer tank, the internal pressure of the transformer tank is monitored to keep the internal pressure of the tank at a predetermined pressure value, so that the internal vacuum of the tank is maintained at a set value, thereby keeping the tank under negative pressure.

[0085] Specifically, the pressure inside the oil tank is detected by a pressure gauge. When the pressure inside the oil tank changes or fluctuates, the pressure inside the oil tank can be kept at a predetermined pressure value by drawing a vacuum inside the oil tank. That is, a vacuum unit is used to draw a vacuum inside the oil tank. By drawing a vacuum inside the oil tank, some water vapor inside the oil tank can also be extracted.

[0086] In practice, the pressure gauge is observed at preset time intervals. When the pressure difference inside the tank exceeds 0.01 MPa, a vacuum is drawn into the tank to maintain the internal pressure at a predetermined value. Optionally, the preset time interval can be 2 to 3 hours.

[0087] Step S500: After spraying oil into the transformer tank for the first time period, turn off the spraying equipment 100, fill the transformer tank with dry air, and measure the dew point of the air inside the tank to obtain the moisture content of the transformer body inside the tank. This measurement method is based on the national standard "DL / T580-2013 Method for measuring the average moisture content in transformer insulation paper by dew point method".

[0088] It should be noted that inside the sealed oil tank, the gas in the vessel body and the gas inside the tank will reach an equilibrium state after a long period of water vapor exchange. After reaching the equilibrium state, the water content of the vessel body can be obtained by measuring the dew point value of the gas and then according to the relevant curve relationship.

[0089] It should be noted that the transformer body is made of insulating material, meaning that the transformer body is its insulating component.

[0090] Specifically, the dew point of the dry air introduced into the transformer's tank is less than or equal to -65°C.

[0091] Specifically, after spraying oil into the transformer tank for a first time period and turning off the spraying equipment 100, and before filling the transformer tank with dry air, the drying method further includes: evacuating the transformer tank to make the internal vacuum level of the transformer tank less than or equal to a predetermined value and maintaining it for a second time period.

[0092] Optionally, the predetermined value is 50 Pa, even if the internal vacuum of the oil tank is less than or equal to 50 Pa; the second time period is 16 hours.

[0093] Specifically, after the spray equipment 100 is turned off, the oil inside the transformer's oil tank can be drained.

[0094] By implementing the above drying method, the drying efficiency of the transformer body can be effectively guaranteed, the processing time is short, the processing cost is low, and the operation is simple and convenient.

[0095] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0096] In the spraying device 100 provided by the present invention, the spraying device 100 includes a heat exchanger 10. The oil inlet of the heat exchanger 10 is connected to the oil outlet of the oil tank of the transformer 200 so that the oil in the oil tank of the transformer 200 after heating and drying the transformer body enters the heat exchanger 10. The heat exchanger 10 is used to heat the oil entering the heat exchanger 10, thereby heating the oil to a specified temperature. The oil outlet of the heat exchanger 10 is connected to the oil inlet of the oil tank of the transformer 200 so that the heated oil in the heat exchanger 10 enters the oil tank of the transformer 200 to heat and dry the transformer body located in the oil tank. The spraying device 100 of this application is combined with the transformer 200. It heats the oil in the oil tank of the transformer 200 to dry the transformer body located in the oil tank. This structural arrangement makes the structure of the spraying device 100 of this application relatively simple and solves the problem of complex structure of the existing spraying system for transformers.

[0097] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0098] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0099] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sprinkler apparatus, characterized by, The spray device comprises: a heat exchanger (10), an oil inlet of the heat exchanger (10) is communicated with an oil outlet of an oil tank of a transformer (200) so that oil in the oil tank after being heated for the body of the transformer (200) enters the heat exchanger (10); an oil outlet of the heat exchanger (10) is communicated with an oil inlet of the oil tank so that the oil in the heat exchanger (10) after being heated enters the oil tank to heat and dry the body of the transformer (200) in the oil tank; a steam generator (20), an outlet of the steam generator (20) is communicated with an inlet of the heat exchanger (10) to provide saturated steam as a heat exchange medium for the heat exchanger (10); a regulating valve (23) arranged on a pipeline between the outlet of the steam generator (20) and the inlet of the heat exchanger (10), the amount of saturated steam provided for the heat exchanger (10) in a set time period is controlled by controlling the opening degree of the regulating valve (23), and then the temperature of the oil in the heat exchanger (10) being heated in the set time period is controlled; a first temperature detection component (44) arranged on a pipeline connected with the oil inlet of the heat exchanger (10) to detect the temperature of the oil entering the heat exchanger (10); a second temperature detection component (45) arranged on a pipeline connected with the oil outlet of the heat exchanger (10) to detect the temperature of the oil flowing out of the oil outlet of the heat exchanger (10); a control unit (60), the first temperature detection component (44), the second temperature detection component (45) and the regulating valve (23) are in communication connection with the control unit (60), so that the control unit (60) acquires the oil temperature information detected by the first temperature detection component (44) and the oil temperature information detected by the second temperature detection component (45), and controls the opening degree of the regulating valve (23) according to the acquired oil temperature information.

2. The shower apparatus according to claim 1, characterized in that The spray device further comprises: an oil supply pump (41) arranged on a pipeline between the oil outlet of the oil tank and the oil inlet of the heat exchanger (10).

3. The shower apparatus of claim 2, wherein The spray device further comprises: a first filter (21) arranged on a pipeline between the outlet of the steam generator (20) and the inlet of the heat exchanger (10); and / or a water storage component (30), an outlet of the water storage component (30) is communicated with an inlet of the steam generator (20) to supply water to the steam generator (20); and / or a second filter (43) arranged on a pipeline between the oil supply pump (41) and the oil outlet of the oil tank.

4. The spray device according to claim 3, wherein The backwater outlet of the water storage component (30) is communicated with the outlet of the heat exchanger (10), so that the condensed water formed after the saturated steam in the heat exchanger (10) heats the oil liquid enters the water storage component (30) through the outlet of the heat exchanger (10) and the backwater outlet of the water storage component (30); and / or A feed water pump (31) is arranged on the pipeline between the outlet of the water storage component (30) and the inlet of the steam generator (20).

5. The shower apparatus of claim 4, wherein A drain valve (33) is arranged on the pipeline between the backwater outlet of the water storage component (30) and the outlet of the heat exchanger (10), so as to control the opening and closing of the pipeline between the backwater outlet of the water storage component (30) and the outlet of the heat exchanger (10) by opening or closing the drain valve (33).

6. The shower apparatus of claim 3, wherein The spraying device further comprises: A flow meter (47) is arranged on the pipeline between the oil outlet of the heat exchanger (10) and the oil inlet of the oil tank.

7. The shower apparatus of claim 1, wherein The spraying device further comprises a spraying head (50), the oil inlet of the spraying head (50) is communicated with the oil outlet of the heat exchanger (10), and the oil outlet of the spraying head (50) is communicated with the oil inlet of the oil tank; the oil outlet of the spraying head (50) comprises a plurality of spaced oil outlets, so that the oil liquid in the spraying head (50) is sprayed into the oil tank through the plurality of oil outlets.

8. A drying method characterized by, The drying method is suitable for the spraying device in any one of claims 1 to 7, and the drying method comprises: Step S100: vacuumizing the oil tank of the transformer, so that the oil tank of the transformer is in a full vacuum state; Step S200: injecting oil into the inside of the oil tank of the transformer in the full vacuum state, so that the oil liquid in the oil tank of the transformer reaches a predetermined height; Step S300: filling dry air into the inside of the oil tank of the transformer, so that the internal pressure of the oil tank of the transformer rises to a predetermined pressure value, and the inside of the oil tank of the transformer is kept in a negative pressure state; Step S400: starting the spraying device, and spraying oil liquid into the inside of the oil tank of the transformer for a first time period; Step S500: closing the spraying device, filling dry air into the inside of the oil tank of the transformer, and standing to measure the dew point of the air in the inside of the oil tank.

9. The drying method according to claim 8, wherein After the spraying device is closed and before the dry air is filled into the inside of the oil tank of the transformer, the drying method further comprises: vacuumizing the oil tank of the transformer, so that the internal vacuum degree of the oil tank of the transformer is less than or equal to a predetermined value and is maintained for a second time period; and / or In the step S400, the internal pressure of the oil tank of the transformer is monitored during the process of heating the body of the transformer by using the spraying device, so that the internal pressure of the oil tank is kept at the predetermined pressure value, and the inside of the oil tank is kept in a negative pressure state.

10. The drying method according to claim 8, wherein The predetermined height is in a range of 1 m to 1.5 m; and / or The predetermined pressure value ranges from -0.04 MPa to -0.06 MPa; and / or The dew point of the dry air filled into the oil tank of the transformer ranges from -65℃ or less; and / or When the oil temperature of the oil outlet of the heat exchanger (10) of the spraying device is 110℃ to 120℃, the first time period is 16h.

11. The drying method according to claim 9, characterized in that, The predetermined value ranges from 50Pa or less, and the second time period is 16h.

Images