A power device dry air supply device

Abstract

The utility model discloses a kind of electric power equipment drying air supply device, the utility model relates to electric power engineering technical field.It includes: air compressor, the outer wall of the air compressor is connected with conveying pipe, the side of the air compressor is connected with gas storage bag through conveying pipe, the outer wall of the side of the gas storage bag away from air compressor is connected with filter through conveying pipe;By shunting design realizes snow melting and drying gas double-function integrated, can output 70 ℃ high pressure high insulation gas, when ice and snow disaster, quickly remove the ice of equipment such as substation insulating pillar, such as example 1 in-10 ℃ environment 1 hour removes 5mm thick ice, meet emergency deicing demand, can stably supply 200m³ / h, dew point ≤-70 ℃ drying air, adapt to transformer maintenance scene such as moisture-proof demand, such as example 2 in 110KV transformer 2 days maintenance continuous air supply, without for emergency deicing and routine drying air supply separately equipped with multiple equipment.

Description

Technical Field

[0001] This utility model relates to the field of power engineering technology, specifically to a dry air supply device for power equipment. Background Technology

[0002] The insulating supports and disconnecting switches of primary equipment in substations are mostly located outdoors, where they are prone to icing in low-temperature and freezing weather. Ice bridges formed by the umbrella-like structures of insulating supports can reduce insulation strength and cause ice flashover tripping. Icing on disconnecting switches makes them difficult to open and close, affecting power grid operation. Severe icing on transmission lines can even prevent the DC de-icing system from being connected, causing major accidents such as pole collapse and line breakage. At the same time, during transformer maintenance, the internal insulation is easily affected by external moisture. Traditional transformer oil hot circulation drying methods are inefficient and lack safety, making it difficult to meet the insulation and moisture protection requirements of scenarios such as overnight operations. Existing equipment is multifunctional and limited in scope, either only capable of de-icing but with insufficient air insulation, or only capable of providing dry air but unable to adapt to mobile use in outdoor icy and snowy environments. Utility Model Content

[0003] (a) Technical problems to be solved In view of the shortcomings of the existing technology, this utility model provides a dry air supply device for power equipment, which solves the problem of the single function of the existing equipment.

[0004] (II) Technical Solution To solve the above problems, this utility model provides the following technical solution: a power equipment dry air supply device, comprising: an air compressor, a conveying pipe extending through the outer wall of the air compressor, an air storage bladder extending through one side of the air compressor via the conveying pipe, a filter extending through the outer wall of the air storage bladder on the side away from the air compressor via the conveying pipe, three filters being provided, a refrigerated dryer extending through the outer wall of the filter on the side away from the air storage bladder via the conveying pipe, a filter also extending through the conveying pipe on the outer wall above the refrigerated dryer on the side away from the air storage bladder, an adsorption dryer extending through the outer wall of the filter on the side away from the refrigerated dryer via the conveying pipe, and a shuttle valve extending through the outer wall above the adsorption dryer, the shuttle valve being away from the outer wall of the adsorption dryer. A filter is also connected through a delivery pipe. A heater is connected through the delivery pipe to the outer wall of the filter on the side furthest from the adsorption dryer. The device, through the sequential cooperation of components such as an air compressor, air reservoir, filter, refrigerated dryer, adsorption dryer, and heater, forms a complete dry air preparation process. From air generation, storage, filtration, dehumidification to heating, it gradually improves the dryness and cleanliness of the air, providing a stable supply of high-quality dry air to power equipment, ensuring its normal operation. Multiple filters are arranged in stages in the airflow path, allowing for multiple filtrations of the air, effectively removing different types of impurities, improving air cleanliness, preventing impurities from entering the power equipment and causing component wear or malfunction, and extending the service life of the power equipment. The refrigerated dryer and adsorption dryer... The combined use of dryers involves initial dehumidification via a refrigerated dryer, followed by deep dehydration via an adsorption dryer. This dual dehumidification method reduces air humidity, meeting the stringent requirements of electrical equipment for low-humidity, dry air. It prevents moisture-induced short circuits within the equipment. The air compressor is an Atlas Copco GA22AP-8.5 screw air compressor with a rated discharge capacity of 3.5 m³ / min, an exhaust temperature 15°C lower than ambient temperature, and noise levels controlled at 68±2 dBA. The motor has an IP54 protection rating and F insulation class. It uses a Y-Δ starting method and is compatible with a 380V / 3-phase / 50Hz power supply with a tolerance of ±10% fluctuation. An air tank from Shanghai Shenjiang (0.3 m³ / 1.0 MPa) is used to stabilize compressed air pressure and reduce noise. To minimize the impact of pressure fluctuations on downstream systems, the tank is equipped with a German WIKAY-60 anti-vibration pressure gauge for pressure monitoring and a pressure relief valve for rapid pressure release and automatic liquid drainage monitoring, preventing liquid accumulation from affecting gas quality. The filters include a pre-filter GP-020-FX, an oil removal filter HE-045-MX, and a post-filter HE-045-FX, all from the British brand Parker Hannifin. The filter housings are made of die-cast aluminum alloy, and the filter elements are made of oleophobic and hydrophobic borosilicate glass fiber. These filters sequentially remove large particles, oil, and fine particles from compressed air, ultimately achieving a purification effect of ≤0.01μm dust content and ≤0.01mg / m³ oil content. The operating pressure range is 0.4-0.9MPa, and the maximum pressure loss is ≤0.The pressure swing adsorption dryer uses the Chongqing Yuneng YN200 model heatless regeneration dryer, based on the principle of pressure swing adsorption, to achieve deep drying through alternating adsorption and regeneration in two towers. The adsorbent is an imported molecular sieve, and the switching valve is an imported high-quality cylinder switching valve. The finished gas pressure dew point is ≤-70℃, with a maximum working pressure of 1.3MPa and a minimum working pressure of 0.4MPa. The dryer is equipped with a dew point energy-saving control system that automatically switches regeneration mode based on dew point temperature, reducing energy consumption. It also features a real-time online dew point display using a Finnish Vaisala DMT142C3A30X dew point temperature transmitter for easy monitoring of drying performance. The heater, an Aijie technology GYQ220V 3KW electric heating device, heats the dryer to 70℃. The air is then delivered via a 25-meter high-quality domestic air drum and electric drum to a 4-meter long handheld telescopic high-insulation operating rod. The rod has an insulation withstand voltage of 110KV, a temperature resistance of ≤180℃, and an air flow rate of ≤40m³ / h, enabling precise snow and ice removal from insulated support posts. The pressure transmitter is a Baomeng CTX333B220, and the flow meter is a Nankong LUGB-2304 gas flow meter.

[0005] Preferably, a manual control valve is fixedly connected to the outer wall of the delivery pipe between the air storage bag and the filter. Both sides of the refrigerated dryer are connected to the filter through delivery pipes. A pneumatic two-way valve is fixedly connected to the outer wall of the delivery pipe between the filter and the adsorption dryer. A manual regeneration valve is provided between the adsorption dryer and the shuttle valve. The manual control valve provides operators with a way to manually control the pipeline opening and closing. In scenarios such as device maintenance and abnormal handling, the air supply can be quickly cut off, improving the flexibility and safety of device operation and reducing the difficulty of troubleshooting. Filters are connected to both sides of the refrigerated dryer to achieve bidirectional filtration of the input and output air of the refrigerated dryer. This protects the internal components of the refrigerated dryer from damage by impurities and further improves the air cleanliness, ensuring the effectiveness of subsequent drying processes and guaranteeing the quality of the final output dried air. The automatic control function of the pneumatic two-way valve reduces manual intervention, improves the automation level of device operation, avoids pipeline control problems caused by human operation errors, and ensures the smoothness and stability of the air supply process. The manual regeneration valve can regenerate the adsorbent, eliminating the need for frequent adsorbent replacement, reducing device operating costs, and extending the effective working cycle of the adsorption dryer.

[0006] Preferably, a throttling valve is connected to the outer wall of the delivery pipe between the filter and the heater on the side away from the adsorption dryer via a branch pipe. A dew point sensor is connected to the outer wall of the throttling valve on the side away from the delivery pipe via a branch pipe. A pressure regulating valve is connected to the branch pipe on the outer wall of the delivery pipe on the side away from the dew point sensor. A handheld heater is connected to the outer wall of the pressure regulating valve on the branch pipe. A handheld insulating rod is connected to the outer wall of the handheld heater on the side away from the pressure regulating valve via the delivery pipe. A pressure regulating valve is also provided on the outer wall of the delivery pipe between the pressure regulating valve and the heater. A flow meter is connected to the outer wall of the heater on the side away from the pressure regulating valve via the delivery pipe. Pressure gauges are provided on both sides of the adsorption dryer, and the monitoring end of the pressure gauge extends into the interior of the adsorption dryer. The dew point sensor, in conjunction with the throttling valve, can monitor the dew point value of the dried air in real time, facilitating operation. Personnel should promptly monitor the air dryness level and adjust the device's operating parameters accordingly to ensure that the output dry air humidity meets the requirements of the power equipment. This prevents the power equipment from being affected by substandard air humidity. Pressure regulating valves are installed on the main delivery pipeline and branch pipelines to adjust the air pressure in the main pipeline and branch pipelines respectively, ensuring that each component operates under a suitable pressure environment, improving the stability of the device's operation, and ensuring that the dry air pressure delivered to the power equipment meets the usage standards. This prevents damage to the power equipment due to abnormal pressure. Flow meters can monitor the air supply in real time, allowing operators to intuitively understand the flow rate of the dry air output by the device. This facilitates adjustments to the air supply based on the actual needs of the power equipment, achieving on-demand supply and avoiding energy waste. Pressure gauges on both sides of the adsorption dryer can promptly report the internal air pressure, facilitating the rapid detection of abnormal air pressure, reducing troubleshooting time, and ensuring the continuous and stable operation of the device.

[0007] Preferably, a manual drain valve is provided on the outer wall of the conveying pipe below the air storage bladder. A manual drain valve is fixedly connected to the outer wall of the conveying pipe on one side of the manual drain valve. Both the manual drain valve and the manual drain valve are connected to a condensate drain main pipe. The conveying pipes below the filter are also connected to the condensate drain main pipe. A pressure gauge is installed above the air storage bladder on the side near the air compressor, and the monitoring section of the pressure gauge is inside the air storage bladder. The manual drain valve and the manual drain valve can respectively discharge impurities and condensate in the conveying pipe, preventing impurities from clogging the pipe and affecting air circulation, and avoiding condensate residue from increasing air humidity, thus ensuring the internal pipes of the device are protected. Unobstructed pipelines and dry air reduce equipment malfunctions caused by pipe blockages or residual moisture. The condensate main pipe centrally collects and treats impurities and condensate discharged from manual drain valves, manual drain valves, and filters, preventing the indiscriminate discharge of sewage and impurities that pollutes the environment. It also simplifies the sewage and drainage process, reduces the maintenance workload of operators, and improves the ease of equipment maintenance. The pressure gauge on the air bladder can directly monitor its internal air pressure, allowing operators to promptly grasp the pressure status of the air bladder and quickly adjust the operating parameters of the air compressor to maintain stable air pressure inside the air bladder. This prevents excessive air pressure fluctuations from affecting the normal operation of subsequent components and ensures the stability of the entire equipment operation.

[0008] Preferably, a pressure transmitter is fixedly connected to the outer wall of the heater near the flow meter. The monitoring end of the pressure transmitter extends into the interior of the heater, enabling direct and accurate detection of the internal pressure. This avoids detection errors caused by external factors, providing reliable data for operators to judge the heater's operating status and reducing misoperations caused by inaccurate pressure detection. The pressure transmitter can convert pressure signals into electrical signals and transmit them in real time, enabling real-time monitoring and visualization of pressure data. Operators can promptly grasp the internal pressure of the heater without manual detection, improving the convenience of device operation monitoring, facilitating the rapid detection of pressure anomalies and taking appropriate measures, ensuring the safe and stable operation of the heater. Real-time pressure monitoring can effectively prevent safety accidents caused by excessively high internal pressure or decreased heating efficiency due to excessively low pressure, ensuring that the heater always operates under optimal pressure conditions, thus guaranteeing both safe device operation and maintaining a stable heating effect.

[0009] (III) Beneficial Effects This utility model provides a dry air supply device for power equipment. It has the following beneficial effects: (I) This power equipment dry air supply device integrates snow removal and de-icing functions with dry air supply through a split design. On the one hand, it can output 70℃ high-pressure, high-insulation gas to quickly remove ice from equipment such as substation insulation supports during snow and ice disasters. For example, in Example 1, it can remove 5mm thick ice in 1 hour at -10℃, meeting emergency de-icing needs. On the other hand, it can stably supply 200m³ / h of dry air with a dew point ≤-70℃, which is suitable for moisture-proofing needs in scenarios such as transformer maintenance. For example, in Example 2, it can provide continuous air supply for 2 days of maintenance of a 110KV transformer. There is no need to equip multiple devices separately for emergency de-icing and daily dry air supply, reducing equipment procurement and storage costs in substations and other places, and improving equipment resource utilization.

[0010] (II) This power equipment drying air supply device features dual manual and automatic control. The manual control valve and manual regeneration valve facilitate manual intervention, while the pneumatic two-way valve and shuttle valve work in conjunction with a PLC to achieve automated operation. Combined with comprehensive monitoring components such as pressure gauges and dew point sensors, it can monitor key parameters such as air pressure and dew point in real time, ensuring that the dust content of the outlet air is ≤0.01μm and the dew point is ≤-70℃. It can also work stably in outdoor environments from -18℃ to 45℃, meeting the substation operation standards. In terms of maintenance, the condensate main pipe centrally treats impurities and condensate, reducing the frequency of maintenance. The adsorbent can be regenerated through the manual regeneration valve to extend its lifespan, eliminating the need for frequent replacement of consumables. This reduces the maintenance intensity for operators and the long-term operating costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0012] In the diagram: 1. Handheld heater; 2. Pressure regulating valve; 3. Air compressor; 4. Air reservoir; 5. Refrigerated dryer; 6. Filter; 7. Manual drain valve; 8. Manual drain valve; 9. Adsorption dryer; 10. Heater; 11. Pressure transmitter; 12. Dew point sensor; 13. Flow meter; 14. Shuttle valve; 15. Throttling valve; 16. Handheld insulating rod; 17. Manual control valve; 18. Manual regeneration valve; 19. Pneumatic two-way valve; 20. Condensate drain main; 21. Delivery pipe. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1This utility model provides a technical solution for a power equipment drying air supply device, including: an air compressor 3, a conveying pipe 21 connected through the outer wall of the air compressor 3, an air storage bag 4 connected through the conveying pipe 21 on one side of the air compressor 3, a filter 6 connected through the conveying pipe 21 on the outer wall of the air storage bag 4 away from the air compressor 3, three filters 6 are provided, a refrigerated dryer 5 connected through the conveying pipe 21 on the outer wall of the filter 6 away from the air storage bag 4, a filter 6 also connected through the conveying pipe 21 on the outer wall above the refrigerated dryer 5, an adsorption dryer 9 connected through the conveying pipe 21 on the outer wall of the filter 6 away from the refrigerated dryer 5, a shuttle valve 14 connected through the outer wall above the adsorption dryer 9, a filter 6 also connected through the conveying pipe 21 on the outer wall of the shuttle valve 14 away from the adsorption dryer 9, and a heater 10 connected through the conveying pipe 21 on the outer wall of the filter 6 away from the adsorption dryer 9.

[0015] A manual control valve 17 is fixedly connected to the outer wall of the conveying pipe 21 between the air storage bag 4 and the filter 6. Both sides above the refrigerated dryer 5 are connected to the filter 6 through the conveying pipe 21. A pneumatic two-way valve 19 is fixedly connected to the outer wall of the conveying pipe 21 between the filter 6 and the adsorption dryer 9. A manual regeneration valve 18 is provided between the adsorption dryer 9 and the shuttle valve 14.

[0016] A throttling valve 15 is connected to the outer wall of the conveying pipe 21 between the filter 6 and the heater 10 on the side away from the adsorption dryer 9 via a branch pipe. A dew point sensor 12 is connected to the outer wall of the throttling valve 15 on the side away from the conveying pipe 21 via a branch pipe. A pressure regulating valve 2 is connected to the outer wall of the conveying pipe 21 on the side away from the filter 6 via a branch pipe. A handheld heater 1 is connected to the outer wall of the pressure regulating valve 2 on the branch pipe. A handheld insulating rod 16 is connected to the outer wall of the handheld heater 1 on the side away from the pressure regulating valve 2 via the conveying pipe 21. A pressure regulating valve 2 is also provided on the outer wall of the conveying pipe 21 between the pressure regulating valve 2 and the heater 10. A flow meter 13 is connected to the outer wall of the heater 10 on the side away from the pressure regulating valve 2 via the conveying pipe 21. Pressure gauges are provided on both sides of the adsorption dryer 9, and the monitoring end of the pressure gauge extends into the interior of the adsorption dryer 9.

[0017] A manual drain valve 7 is provided on the outer wall of the delivery pipe 21 below the air reservoir 4. A manual drain valve 8 is fixedly connected to the outer wall of the delivery pipe 21 on one side of the manual drain valve 7. The delivery pipes 21 below the manual drain valve 7 and the manual drain valve 8 are all connected to the condensate drain main pipe 20. The delivery pipes 21 below the filter 6 are all connected to the condensate drain main pipe 20. A pressure gauge is provided on the upper side of the air reservoir 4 near the air compressor 3, and the monitoring section of the pressure gauge is inside the air reservoir 4.

[0018] A pressure transmitter 11 is fixedly connected to the outer wall of the heater 10 near the flow meter 13, and the monitoring end of the pressure transmitter 11 extends into the interior of the heater 10.

[0019] When in use, after starting the device, compressed air is first generated by the operation of the screw air compressor 3. The compressed air is delivered to the air storage bladder 4 for temporary storage through the delivery pipe 21 that runs through the outer wall of the air compressor 3. The pressure gauge on the air storage bladder 4 monitors the internal air pressure in real time. The operator adjusts the operating status of the air compressor 3 according to the reading to ensure that the air pressure is maintained at 0.4-0.9MPa, so as to provide a stable air source for subsequent processes.

[0020] Primary filtration and pre-dehumidification: Compressed air in the air reservoir 4 flows through the delivery pipe 21 to three filters 6, which filter out particles and oil impurities in sequence. If maintenance is required, the manual control valve 17 can be closed to cut off the air supply. The filtered air enters the refrigerated dryer 5 and undergoes secondary filtration and dehumidification treatment through the filters 6 on both sides to initially remove moisture and residual impurities.

[0021] Deep drying and regeneration control: After pre-dehumidification, the air flows to the adsorption dryer 9 through the delivery pipe 21. The pneumatic two-way valve 19 opens automatically, and the air enters the adsorption dryer 9 and is deeply dehydrated by the molecular sieve. The pressure gauges on both sides of the adsorption dryer 9 monitor the air pressure in real time. When the adsorbent capacity decreases, the regeneration airflow is adjusted by the manual regeneration valve 18 to complete the regeneration of the adsorbent.

[0022] The air is diverted for monitoring and heating output. After deep drying, the air enters the shuttle valve 14 and is automatically diverted to the filter 6 for further filtration. The throttle valve 15 between the filter 6 and the heater 10 regulates the flow of some air to the dew point sensor 12, which monitors the dew point value in real time and feeds it back to the control system.

[0023] In the snow removal and de-icing branch, the air in the branch pipe on the side of the dew point sensor 12 is regulated by the pressure regulating valve 2, then enters the handheld heater 1 and is heated to 70°C. It is then sprayed out through the handheld insulating rod 16 for the purpose of removing ice from power equipment.

[0024] In the drying gas supply branch, the main air enters the heater 10 after being regulated by the pressure regulating valve 2 and heated to the appropriate temperature of 40℃-70℃. The pressure transmitter 11 monitors the pressure inside the heater 10 in real time. Finally, the air flows to the flow meter 13 and is stably delivered to equipment such as transformers after flow monitoring, meeting the maintenance and moisture prevention requirements with a gas supply of 200m³ / h.

[0025] For sewage and drainage maintenance, during the operation of the device, the manual sewage valve 7 below the air storage bag 4 is opened regularly to discharge impurities, and the manual drain valve 8 is opened to discharge condensate. The impurities and condensate are centrally treated through the condensate drain main pipe 20. The condensate produced by the filter 6 is also collected into the condensate drain main pipe 20 through the lower conveying pipe 21 to ensure pipeline cleanliness and air quality.

[0026] The entire process is handled with controllable quality. From compression, filtration, pre-dehumidification to deep drying, a complete air handling chain is formed. Multi-stage filtration and dual drying (cold drying + adsorption) ensure that the exhaust air contains ≤0.01μm dust, ≤0.01mg / m³ oil, and ≤-70℃ dew point, meeting the high cleanliness and low humidity requirements of power equipment.

[0027] Dual-function output, scene adaptability: Through the diversion design, it realizes the dual functions of snow removal, ice melting and drying gas supply. 70℃ high-pressure and high-insulation gas is suitable for emergency snow disasters, and 200m³ / h dry air is suitable for transformer maintenance, without the need to equip multiple devices.

[0028] With both manual and automatic control, the operation is flexible. Key nodes are equipped with manual control valve 17 and manual regeneration valve 18 to facilitate manual intervention and maintenance. Pneumatic two-way valve 19, shuttle valve 14 and PLC control system realize automated operation, reduce the intensity of operation and improve reliability.

[0029] Comprehensive monitoring, safe and reliable, equipped with pressure gauge, dew point sensor 12, pressure transmitter 11, flow meter 13, real-time monitoring of air pressure, dew point, temperature, and flow rate, and timely adjustment in case of abnormality. It has a rainproof and enclosed structure and IP54-level motor protection, and is suitable for outdoor environments from -18℃ to 45℃. The noise of the whole machine is ≤69dBA, which meets the substation operation standards.

[0030] Centralized sewage discharge and convenient maintenance: the condensate main pipe 20 integrates the discharge of impurities and condensate, reducing the frequency of maintenance; the adsorbent can be regenerated through the manual regeneration valve 18, extending the life of consumables and reducing operating costs.

[0031] Example 1: Snow removal and de-icing of insulated support pillars during snow and ice disasters When a substation encounters freezing weather with temperatures as low as -10°C and the ice thickness on the insulating supports reaches 5mm, this device needs to be activated for snow removal and de-icing operations.

[0032] For device deployment, move the device near the insulated support pillar, adjust and secure the bottom support feet, connect to a 380V three-phase five-wire 50Hz power supply, turn on the device's main control switch, and select the snow removal and de-icing mode via the touchscreen. Compression and pretreatment: The screw air compressor 3 starts and generates compressed air with a pressure of 0.8MPa. It is sent to the air storage bag 4 through the delivery pipe 21. The pressure gauge of the air storage bag 4 shows 0.8MPa. There is no need to adjust the air compressor's operating status. The compressed air enters three filters 6 through the manual control valve 17 to filter out dust and oil in the air. Then it enters the refrigerated dryer 5 to cool down to 5°C to initially condense moisture. Finally, it passes through the filters on both sides 6 to remove condensate and impurities.

[0033] Deep drying: Pretreated air enters the adsorption dryer 9 through a pneumatic two-way valve 19. The molecular sieve adsorbs the remaining moisture. The pressure gauges on both sides of the adsorption dryer 9 show 0.75 MPa. The dew point sensor 12 monitors the dew point value in real time, which is -65℃, meeting the drying requirements.

[0034] Heating output: The operator adjusts the throttle valve 15 to maintain the air flow rate in the branch pipe at 5 m³ / h. After the air pressure is adjusted to 0.5 MPa by the pressure regulating valve 2, it enters the portable heater 1 and is heated to 70°C. The operator holds the insulating rod 16 and connects it to the portable heater 1. The operator holds the insulating rod 16 and aims the nozzle at the ice-covered part of the insulating support. The 70°C high-pressure gas quickly melts the ice layer and blows away the snow. During the operation, the pressure transmitter 11 shows that the pressure inside the heater 10 is stable and there are no abnormal alarms.

[0035] After the work is completed and maintenance is carried out, the ice on the insulating support is completely removed after 1 hour. The snow removal and de-icing mode is turned off, the air compressor stops running, and the manual drain valve 7 and manual drain valve 8 are opened to discharge the air storage bag 4 and impurities and condensate in the pipeline. The impurities and water are collected and treated through the condensate drain main pipe 20, and then the main power is turned off.

[0036] Example 2: Transformer maintenance dry air supply based on Example 1 A 110kV transformer needs to undergo a 2-day overhaul. A continuous supply of dry air is required to prevent the internal insulation from getting damp. The operation of this device is as follows.

[0037] Connect the device by moving it next to the transformer. Connect the device's output to the transformer's air inlet via the DN40 interface. Adjust and secure the support feet. Turn on the power and select the drying air supply mode on the touchscreen. Parameter settings: The air supply volume is set to 200 m³ / h, the output pressure is 0.05 MPa, and the outlet air temperature is 30℃ via the touch screen. The PLC automatically matches the operating parameters of the air compressor and heater 10.

[0038] In the air processing, the air compressor 3 generates 0.9MPa compressed air, which is buffered by the air storage bag 4 and then passes through three filters 6 and the refrigerated dryer 5 for preliminary purification and dehumidification. It then enters the adsorption dryer 9 for deep drying. The dew point sensor 12 shows a dew point of -70℃, which meets the requirements. After the dried air passes through the shuttle valve 14 and the filter 6, the main pressure regulating valve 2 adjusts the pressure to 0.05MPa, and the heater 10 heats the air to 30℃.

[0039] With continuous gas supply and monitoring, flow meter 13 showed a stable gas supply of 200 m³ / h, pressure transmitter 11 showed a pressure of 0.05 MPa inside heater 10, and temperature sensor CU50 showed an outgoing gas temperature of 30°C. During the maintenance period, including overnight work, the device maintained stable pressure inside the transformer through automatic gas compensation function, preventing external moisture intrusion.

[0040] After the overhaul and maintenance are completed, turn off the drying gas supply mode, open the pressure relief valve to release pressure, and disconnect the connection with the transformer after the pressure drops to 0. Open the manual drain valve 7, manual drain valve 8 and filter 6 drain port, and centrally treat impurities and condensate through the condensate main pipe 20. After cleaning the pipeline, turn off the main power supply.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dry air supply device for power equipment, characterized in that, include: An air compressor (3) is provided, with a conveying pipe (21) running through its outer wall. An air reservoir (4) is connected to one side of the air compressor (3) through the conveying pipe (21). A filter (6) is connected to the outer wall of the air reservoir (4) on the side away from the air compressor (3) through the conveying pipe (21). Three filters (6) are provided. A refrigerated dryer (5) is connected to the outer wall of the filter (6) on the side away from the air reservoir (4) through the conveying pipe (21). The refrigerated dryer (5) is connected to the side away from the air reservoir (4). The upper outer wall also has a filter (6) through the conveying pipe (21). The outer wall of the filter (6) away from the refrigerated dryer (5) is connected to an adsorption dryer (9) through the conveying pipe (21). The upper outer wall of the adsorption dryer (9) is connected to a shuttle valve (14). The outer wall of the shuttle valve (14) away from the adsorption dryer (9) is also connected to a filter (6) through the conveying pipe (21). The outer wall of the filter (6) on the side away from the adsorption dryer (9) is connected to a heater (10) through the conveying pipe (21).

2. The power equipment drying air supply device according to claim 1, characterized in that: A manual control valve (17) is fixedly connected to the outer wall of the conveying pipe (21) between the air storage bag (4) and the filter (6). Both sides of the refrigerated dryer (5) are connected to the filter (6) through the conveying pipe (21). A pneumatic two-way valve (19) is fixedly connected to the outer wall of the conveying pipe (21) between the filter (6) and the adsorption dryer (9). A manual regeneration valve (18) is provided between the adsorption dryer (9) and the shuttle valve (14).

3. The power equipment drying air supply device according to claim 1, characterized in that: A throttle valve (15) is connected to the outer wall of the conveying pipe (21) between the filter (6) away from the adsorption dryer (9) and the heater (10) via a branch pipe. A dew point sensor (12) is connected to the outer wall of the end of the throttle valve (15) away from the conveying pipe (21) via a branch pipe. A pressure regulating valve (2) is connected to the outer wall of the conveying pipe (21) away from the filter (6) via a branch pipe. A portable heater (1) is connected to the outer wall of the pressure regulating valve (2) located on the branch pipe. The outer wall of the handheld heater (1) away from the pressure regulating valve (2) is connected to a handheld insulating rod (16) through a conveying pipe (21). The outer wall of the conveying pipe (21) between the pressure regulating valve (2) and the heater (10) is also provided with a pressure regulating valve (2). The outer wall of the heater (10) away from the pressure regulating valve (2) is connected to a flow meter (13) through a conveying pipe (21). Pressure gauges are provided on both sides of the adsorption dryer (9), and the monitoring end of the pressure gauge extends into the interior of the adsorption dryer (9).

4. The power equipment drying air supply device according to claim 1, characterized in that: A manual drain valve (7) is provided on the outer wall of the conveying pipe (21) below the air storage bag (4). A manual drain valve (8) is fixedly connected to the outer wall of the conveying pipe (21) on one side of the manual drain valve (7). The conveying pipe (21) below the manual drain valve (7) and the manual drain valve (8) are both connected to the condensate drain main pipe (20). The conveying pipe (21) below the filter (6) is connected to the condensate drain main pipe (20). A pressure gauge is provided on the upper side of the air storage bag (4) near the air compressor (3), and the monitoring section of the pressure gauge is inside the air storage bag (4).

5. A power equipment drying air supply device according to claim 3, characterized in that: A pressure transmitter (11) is fixedly connected to the outer wall of the heater (10) near the flow meter (13), and the monitoring end of the pressure transmitter (11) extends into the interior of the heater (10).

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