A portable transformer oil chromatographic on-line sampling and detecting device

Abstract

The utility model relates to the technical field of transformer maintenance, especially to a portable transformer oil chromatography on -line sampling detection device, the utility model discloses a sampling tube, the sampling tube is connected chromatograph through oil suction pump, the chromatograph removes setting and independent power supply, the sampling tube is telescopic structure and inserts transformer oil tank through telescopic structure control, the sampling tube sampling front end corresponds transformer oil tank's multiple sampling points in proper order. Adopt sampling tube direct connection chromatograph and be equipped with independent power supply, need not take oil sample back to laboratory, can complete oil sample collection and chromatography analysis on -the -spot, greatly promote the timeliness of detection, be convenient for in time the grasp transformer oil state, adapt to emergency or mobile detection demand, oil sample collection and analysis process high integration, reduce sample transfer, expose and intermediate link, effectively avoid the gas escape, external pollution and oil sample nature change in the transportation process, ensure the authenticity and reliability of detection result.

Description

Technical Field

[0001] This utility model relates to the technical field of transformer maintenance and repair, and in particular to a portable online sampling and testing device for transformer oil chromatography. Background Technology

[0002] As a key piece of equipment in the power system, the operating status of transformers directly affects the safety and stability of the power grid. Transformer oil, as an insulating and cooling medium, not only performs the functions of insulation and heat dissipation, but also reflects the internal operating condition of the transformer. The content and composition of dissolved gases in transformer oil are important bases for judging internal faults in transformers. Therefore, the quality monitoring and analysis of transformer oil is particularly important.

[0003] Chromatographic detection technology, especially gas chromatography (GC), is widely used in the analysis of dissolved gases in transformer oil due to its high sensitivity, high resolution, and good qualitative and quantitative capabilities. Through chromatographic analysis, various fault gases such as hydrogen, methane, carbon monoxide, carbon dioxide, ethylene, and acetylene can be accurately detected in the oil, thereby determining whether the transformer has abnormal operating conditions such as overheating, discharge, or local overload.

[0004] Currently, most transformer oil chromatography tests involve on-site sampling followed by transportation to a laboratory for analysis. This testing process has several drawbacks. First, on-site sampling is cumbersome and easily affected by the operator's skill level and environmental conditions, leading to unstable sampling quality. Second, samples may experience gas leakage, contamination, or changes in physicochemical properties during transportation, affecting the accuracy and reliability of the test results. Finally, the testing cycle is long, making it impossible to achieve real-time monitoring of the transformer's operating status, thus limiting rapid fault diagnosis and timely maintenance. Utility Model Content

[0005] To simplify sampling and testing operations, achieve rapid and accurate automated testing, and improve testing efficiency and accuracy, this utility model provides a portable online sampling and testing device for transformer oil chromatography.

[0006] The portable online sampling and detection device for transformer oil chromatography provided by this utility model adopts the following technical solution: A portable online sampling and detection device for transformer oil chromatography includes a sampling tube connected to a chromatograph via an oil suction pump. The chromatograph is movable and independently powered. The sampling tube has a telescopic structure and is inserted into the transformer oil tank under control via the telescopic structure. The sampling tip of the sampling tube corresponds sequentially to multiple sampling points in the transformer oil tank.

[0007] By directly connecting the sampling tube to the chromatograph and equipping it with an independent power supply system, oil samples can be quickly collected and analyzed on-site at the transformer, eliminating the need to bring the samples back to the laboratory. This significantly shortens the testing cycle and avoids problems such as gas leakage, contamination, and sample deterioration during transportation, effectively improving the timeliness and reliability of the test results. The device adopts a telescopic sampling tube design, which can flexibly adjust the length according to actual needs and easily insert it into different depths or positions inside the transformer oil tank. The front end of the sampling tube can accurately correspond to multiple sampling points inside the oil tank, realizing multi-point and multi-layer oil sample collection, comprehensively reflecting the true state of the transformer oil, facilitating early detection of stratified local anomalies. The sampling and testing processes are highly integrated, reducing manual operation steps, lowering sample contamination or data errors caused by improper operation, and improving the objectivity, consistency, and automation level of the test.

[0008] Furthermore, the sampling tube includes a connector and a telescopic tube. The connector is threadedly installed at the sampling reserved port of the transformer oil tank. The telescopic tube is fixed by the connector, and the telescopic tube and the connector are mutually telescopic. The side wall of the telescopic tube has multiple sampling ports, and the multiple sampling ports are arranged along the axial direction of the telescopic tube.

[0009] The threaded connector tightly fits into the pre-drilled sampling port in the transformer tank, ensuring a secure installation of the sampling tube and preventing loosening due to vibration or operation. This guarantees a tight seal during sampling, preventing oil leakage or the entry of external impurities, thus enhancing the safety and reliability of the test. The telescopic design between the telescopic tube and the connector allows for adjustment of the tube's length according to on-site needs, facilitating accurate positioning of the sampling port at different depths within the tank. Multiple sampling ports are arranged axially along the telescopic tube, enabling the collection of oil samples from multiple layers or locations within the tank, comprehensively reflecting the state of the transformer oil and improving diagnostic accuracy. The modular design of the connector and telescopic tube facilitates on-site disassembly and maintenance, reducing equipment maintenance difficulty and costs. Furthermore, the threaded connection structure offers strong versatility and adaptability, making it convenient for use with sampling ports of various specifications and models of transformer tanks.

[0010] Furthermore, the connector is connected and installed at the sampling port of the transformer oil tank by a fixing nut. A sealing gasket is provided at the contact surface between the front end of the connector and the sampling port of the transformer oil tank. The connector is sleeved on the telescopic tube, and a clamping nut is provided at the rear end of the connector. The clamping nut controls the clamping of the telescopic tube by tightening the elastic inner wall. At least one sealing sleeve is fixedly provided in the inner cavity of the connector. The sealing sleeve is elastically sleeved on the telescopic tube. A limit ring is fixedly provided on the outer wall of the telescopic tube.

[0011] A sealing gasket is installed on the contact surface between the front end of the connector and the sampling port of the transformer oil tank, which can effectively prevent transformer oil leakage or the entry of external impurities during sampling. In addition, at least one sealing sleeve is fixedly installed in the inner cavity of the connector, and the sealing sleeve is elastically fitted onto the outer wall of the telescopic tube, realizing dynamic sealing between the sampling tube and the connector, further improving the sealing performance, ensuring the safety of the sampling process and the purity of the oil sample. The connector is firmly connected to the sampling port of the oil tank by a fixing nut, ensuring the stability and shock resistance of the equipment during the sampling process. The rear end of the connector is equipped with a clamping nut, which can be tightened to adjust the elastic inner wall and effectively clamp the telescopic tube, so that the length of the telescopic tube can be flexibly adjusted and stably positioned, preventing slippage during use and improving the reliability and convenience of actual operation. A limit ring is fixedly installed on the outer wall of the telescopic tube, which can effectively limit the maximum extension length of the telescopic tube, preventing the telescopic tube from accidentally slipping out or falling off due to improper operation, enhancing structural safety, and reducing maintenance risks. The combination of multiple seals and limit structures ensures that the telescopic tube is reliably fixed in the set position, ensuring that the sampling port can be accurately located in the specified oil layer or depth, improving the representativeness of the sampled oil and the accuracy of chromatographic analysis.

[0012] Furthermore, the sampling port is individually connected to an inner lumen tube, the inner lumen tubes are bundled together inside the telescopic tube, and the end of the telescopic tube is connected to a connecting hose, the connecting hose containing multiple strands of segmented lumen tubes that are connected to the inner lumen tubes one by one.

[0013] Each sampling port is individually connected to a separate inner tube, ensuring that oil samples from each sampling point are transmitted through an independent channel. This completely avoids the problems of oil sample mixing or cross-contamination in traditional multi-point sampling, ensuring the independence and representativeness of oil samples from each sampling point, which is beneficial for subsequent accurate analysis. Multiple inner tubes are arranged in an orderly bundle inside the telescopic tube, resulting in a compact structure that makes efficient use of space without affecting the mechanical strength and flexibility of the telescopic tube. It also facilitates the integration and wiring of the overall sampling system. The end of the telescopic tube connects to a connecting hose, which contains multiple segmented inner tubes that precisely connect to each inner tube, ensuring independent and efficient transmission of each sampled oil sample. Through the one-to-one connection between the bundled inner tubes and the segmented inner tubes, simultaneous collection of oil samples from multiple depths or locations can be achieved, greatly improving sampling efficiency and meeting the needs of rapid on-site detection and high-throughput analysis. This structure provides a good foundation for realizing multi-point automatic sampling and remote monitoring, facilitating the subsequent integration of intelligent components such as sensors and automatic valves, and promoting the development of sampling operations towards automation and intelligence.

[0014] Furthermore, the oil suction pumps are arranged side by side, and the rotors are connected in series and driven to the motor through the same rotating shaft. The oil suction pumps are connected to a control valve, which controls the switching of the circulation mode. The control valve has a first circulation mode, an inner circulation mode, and a second circulation mode. An air filter is installed on the pipeline connecting the oil suction pumps and the sampling pipe.

[0015] The oil suction pumps are arranged side by side, with multiple pump rotors connected in series via the same shaft and driven by a shared motor, achieving an integrated multi-pump layout. This design significantly reduces the size and space occupied by the equipment, simplifies the drive system, and facilitates the miniaturization and modularization of the sampling device, improving the overall system integration and installation flexibility. The oil suction pumps are connected to control valves, which have first circulation, internal circulation, and second circulation positions, allowing for flexible switching of the oil sample circulation path. Different circulation modes can be selected according to actual sampling needs, realizing multiple functions such as oil sample collection, flushing, and internal circulation. This enhances the adaptability and ease of operation of the sampling system, meeting diverse on-site conditions. By switching between different circulation positions, pipeline flushing can be performed before sampling, effectively removing residual impurities and improving the purity and representativeness of the oil sample. The multi-position design of the control valve facilitates automated control, which is beneficial for subsequent integration with intelligent control systems. This enables automatic switching, remote monitoring, and fault alarms during the oil sample collection process, improving the safety and intelligence level of system operation. An air filter is installed on the connecting pipe between the oil suction pump and the sampling pipe to effectively filter out air bubbles and prevent them from interfering with the detection results.

[0016] Furthermore, the chromatograph includes an observation stage, an observation mirror, and a detection head. The observation stage is connected to a sampling tube and an oil suction pump and receives oil samples collected from the transformer oil tank by the sampling tube. The observation mirror is installed above the observation stage and its observation direction is towards the observation stage. The detection head is connected to the observation stage and performs chromatographic detection on the transformer oil sample flowing through the observation stage.

[0017] The observation platform, serving as the interface between the chromatograph and the sampling system, can receive oil samples collected from the transformer oil tank in real time via sampling tubes. The observation lens, mounted above and facing the platform, allows operators to observe the flow state, color, and presence of bubbles or impurities in the oil sample during sampling and testing. This enables visual monitoring of the oil sample flow path, timely detection and elimination of sampling anomalies, and improved accuracy and representativeness of the sampling data. The observation lens design allows operators to directly observe the oil sample without disassembling the equipment, facilitating routine maintenance, cleaning, and troubleshooting. The detection head connects directly to the observation platform, enabling real-time chromatographic detection of the transformer oil sample flowing through it. The integrated process of oil sample collection, flow, and detection reduces intermediate steps and lowers the risk of sample exposure and contamination, thus ensuring the originality of the oil sample's physicochemical properties and the accuracy of the test results. Further integration of automatic sample introduction, intelligent monitoring, and remote data acquisition functions can be achieved to meet the needs of modern transformer oil online monitoring and intelligent operation and maintenance.

[0018] Furthermore, the observation platform is provided with an oil passage chamber, which is divided into multiple individual chambers. A light-transmitting plate is installed on one side of the oil passage chamber and is sealed by the light-transmitting plate. A light-transmitting hole is provided on the side of the oil passage chamber opposite to the light-transmitting plate. An oil overflow tank is provided at the end of the oil passage chamber. A light-transmitting lamp is provided at the light-transmitting hole and shines light towards the oil passage chamber. A magnifying glass is provided on the observation mirror.

[0019] The observation platform features multiple separate oil passage chambers, effectively allowing for segmented flow and residence of the oil sample within different chambers. A light-transmitting plate is installed on one side of each oil passage chamber and sealed off, ensuring both the chamber's airtightness to prevent oil leakage and external contamination, while still allowing light to pass through for observation and testing. Light-transmitting holes are located on the opposite side of the light-transmitting plate, with light lamps installed at these holes. The light shines towards the oil passage chamber, providing ample and uniform illumination. This design ensures that the oil sample is clearly illuminated as it flows through each chamber, facilitating observation through the magnifying glass. The sample is magnified for detailed observation, allowing for thorough examination of its color, turbidity, and the presence of impurities or air bubbles. This significantly enhances the intuitiveness and accuracy of oil sample testing. An overflow tank is located at the end of the oil passage chamber, effectively collecting any spilled oil sample and preventing environmental pollution or equipment damage caused by oil leakage. A magnifying glass is installed on the observation lens to magnify the flow state and details of the oil sample, facilitating precise observation and judgment by operators. Combined with auxiliary lighting from the light source, the magnifying glass can more clearly display minute changes in the oil sample, improving detection sensitivity and operational efficiency.

[0020] Furthermore, the detection head is equipped with a chromatographic lamp at its detection front end, and the chromatographic lamp and the detection head are respectively located on both sides of the oil passage. The detection head and the chromatographic lamp are connected to the controller via control wires, and the detection head is connected to the display via data wires and the processor.

[0021] The detection head is equipped with a chromatographic lamp at its front end, with the lamp and detection head positioned on opposite sides of the oil passage chamber. This allows for thorough and uniform illumination of the oil sample. As the oil sample flows through the chamber, the specific wavelength of the chromatographic lamp excites or penetrates it. The lamp and detection head, positioned on opposite sides of the passage chamber, form a penetrating detection layout. This structure helps minimize interference from stray light and improves the signal-to-noise ratio during the detection process. The lamp and detection head are connected to a controller via control wires, enabling automated and precise control of the illumination and detection process. The detection head is connected to a processor and a display via data wires, allowing for real-time processing and analysis of the acquired detection signals. The results are then directly displayed, facilitating real-time monitoring of the oil sample status and chromatographic analysis results by the operator. This helps in the timely detection and response to anomalies.

[0022] Furthermore, the sampling tube, the oil suction pump, and the chromatograph are connected to a cleaning tube, which is connected to a cleaning solution tank via the cleaning pump. The cleaning solution tank has a circulation port that matches the end of the sampling tube. A spring valve is provided at the connection point between the cleaning tube and the pipeline passage of the sampling tube, the oil suction pump, and the chromatograph. The spring valve has two states: one where the cleaning tube is connected and the pipeline passage is blocked, and another where the cleaning tube is blocked and the pipeline passage is released.

[0023] By setting up a cleaning tube connected to the sampling tube, oil suction pump, and chromatograph, and utilizing the cleaning pump to connect to the cleaning solution tank, the system can automatically or manually switch to the cleaning process after the chromatograph completes oil sample testing. This avoids manual disassembly and cumbersome pipe replacement, significantly improving the automation level and operational efficiency of the equipment. The cleaning solution tank is equipped with a circulation port that matches the end of the sampling tube, allowing the cleaning solution to flow in a closed circulation path, preventing leakage and enabling recycling. Spring valves are installed at the pipe connections, allowing switching between two states to prevent cross-contamination between the cleaning solution and the test sample, ensuring the reliability of the test data. At the same time, the spring valves switch according to the flushing pressure of the flushing solution, improving the flexibility of system operation. The automatic cleaning process can periodically remove residues in the pipes, preventing oil sample deposition, blockage, or corrosion inside the pipes, and reducing the need for repeated calibration of the chromatograph due to pipe contamination.

[0024] Furthermore, the cleaning pipe is connected to a blower, and the blower and the cleaning pump are connected to the cleaning pipe through a switching valve, and the switching valve controls the alternating connection to the cleaning pipe.

[0025] By using a switching valve to alternately connect the blower and cleaning pump to the cleaning pipe, the system can flexibly switch between two different cleaning methods: gas purging and liquid flushing. The blower blows in gas to quickly remove residual liquid and impurities from the pipe, while the cleaning pump injects cleaning fluid for deep cleaning. The combination of the two significantly improves the thoroughness of pipe cleaning. The dual cleaning method of gas purging and liquid flushing effectively prevents the accumulation of dirt and deposits in the pipe, reducing the risk of pipe blockage and corrosion. Gas purging can quickly remove residual liquid from the pipe, and combined with deep cleaning with cleaning fluid, it ensures thorough pipe purification and avoids cross-contamination between cleaning fluid and oil samples, thereby ensuring the accuracy and repeatability of subsequent chromatographic detection.

[0026] In summary, this utility model has the following beneficial technical effects: 1. The sampling tube is directly connected to the chromatograph and equipped with an independent power supply. There is no need to bring the oil sample back to the laboratory. Oil sample collection and chromatographic analysis can be completed on site, which greatly improves the timeliness of detection, facilitates timely understanding of the transformer oil status, and meets the needs of emergency or mobile testing.

[0027] 2. The oil sample collection and analysis process is highly integrated, reducing sample transportation, exposure and intermediate steps, effectively avoiding gas escape, external contamination and changes in oil sample properties during transportation, and ensuring the authenticity and reliability of test results.

[0028] 3. The sampling tube adopts a telescopic structure, which can flexibly adjust the insertion depth. The front end is equipped with multiple sampling ports arranged along the axis, which can realize the simultaneous collection of multiple sampling points and different oil layers in the oil tank, comprehensively reflect the stratification and local state of transformer oil, and facilitate the early detection of abnormalities.

[0029] 4. Each sampling port transmits oil samples through an independent inner cavity tube and a corresponding segmented cavity tube, ensuring that the collected oil samples do not mix with each other, thus improving the independence and accuracy of the analysis results.

[0030] 5. The connector and the oil tank sampling port adopt a threaded and sealing gasket structure. A sealing sleeve and a limit ring are provided between the telescopic tube and the connector to ensure that there is no leakage or foreign impurities intrusion during the sampling process, thereby improving the safety and reliability of the sampling operation.

[0031] 6. Multiple oil suction pumps are arranged in parallel and share a single shaft and motor, resulting in a compact structure. The control valve has multiple circulation modes and can flexibly switch between functions such as data collection, internal circulation, and flushing as needed, adapting to different on-site conditions and facilitating integrated automation control.

[0032] 7. An air filter is installed between the sampling tube and the oil suction pump to effectively filter out air bubbles in the oil sample, avoid interference from air bubbles with subsequent chromatographic detection, and improve the accuracy and stability of the detection data.

[0033] 8. The chromatograph observation stand is equipped with a light-transmitting plate, a magnifying lens, and a light-transmitting lamp, enabling intuitive monitoring of oil sample flow, color, impurities, etc., facilitating operators to detect abnormalities in the sampling and testing process in real time, and improving operational convenience and the accuracy of result interpretation.

[0034] 9. The system employs a combination of cleaning pumps, blowers, and switching valves, along with a dual cleaning method of gas purging and liquid flushing, to automatically perform deep cleaning of the sampling tubes, pumps, and internal pipelines of the chromatograph. This effectively prevents deposit blockage and cross-contamination, extends equipment life, and reduces maintenance frequency.

[0035] 10. All components adopt a standardized and modular design, with good connector versatility, adaptable to different models of oil tanks, facilitating quick on-site installation, disassembly and maintenance, while reserving space for future integration of automatic valves, sensors and intelligent monitoring systems to meet the needs of automation and intelligent upgrades of the equipment. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the external structure of the present invention in use. Figure 2 for Figure 1 A full sectional view of the vertical center plane; Figure 3 for Figure 2 A magnified view of part A; Figure 4 for Figure 2 A magnified view of part B; Figure 5 for Figure 2 A magnified view of a portion at point C; Figure 6 for Figure 5 A magnified view of a portion of point D; Explanation of reference numerals in the attached figures: 1. Sampling tube; 11. Connector; 111. Fixing nut; 112. Sealing gasket; 12. Telescopic tube; 121. Clamping nut; 122. Sealing sleeve; 123. Limiting ring; 13. Sampling port; 131. Inner tube; 132. Connecting hose; 2. Oil suction pump; 21. Motor; 22. Control valve; 23. Air filter; 3. Chromatograph; 31. Observation table; 311. Oil passage chamber; 312. Transmitting plate; 313. Transmitting hole; 314. Overflow tank; 32. Observation mirror; 321. Transmitting lamp; 322. Magnification mirror; 33. Detection head; 331. Chromatograph lamp; 332. Controller; 333. Display; 4. Cleaning tube; 41. Cleaning solution tank; 411. Circulation port; 412. Spring valve; 42. Cleaning pump; 43. Blower; 431. Switching valve. Detailed Implementation

[0037] The following will be combined with the appendix Figures 1-6 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] Example 1: This utility model discloses a portable online sampling and detection device for transformer oil chromatography, referring to... Figure 1 and Figure 2 The system includes a sampling tube 1, which is connected to a chromatograph 3 via an oil suction pump 2. The chromatograph 3 is movable and independently powered. The sampling tube 1 is a telescopic structure and is inserted into the transformer oil tank under control of the telescopic structure. The sampling front end of the sampling tube 1 corresponds to multiple sampling points in the transformer oil tank in sequence.

[0040] Sampling tube 1 is made of high-strength stainless steel, which has corrosion resistance and high temperature resistance, ensuring long-term use in transformer oil environment. Sampling tube 1 has good sliding and expansion performance. Multiple sampling points are evenly opened along the axial direction on the side wall. The edges of the sampling points are chamfered to prevent oil flow resistance and blockage.

[0041] The oil suction pump 2 adopts a miniature diaphragm pump or gear pump, such as the KNFNMP830 series. The flow rate is adjustable to meet the needs of simultaneous oil supply at multiple points. The oil suction pumps 2 are installed side by side, and the rotors are connected to a single motor for drive through a common shaft, achieving a compact structure and unified power. The pump body is made of oil-resistant rubber and high-strength plastic.

[0042] Chromatograph 3 is a portable gas chromatograph with an integrated photoelectric detector and chromatographic column, such as the Agilent 490 MicroGC. It supports USB or battery power, making it easy to use in the field and to observe oil samples in real time.

[0043] Tightly connect the connector of sampling tube 1 to the reserved sampling port of the transformer oil tank through the thread, ensure that the sealing gasket is installed correctly to prevent leakage, and adjust the length of the telescopic tube according to the testing requirements so that the sampling port is accurately aligned with the multiple sampling points inside the oil tank that need to be sampled.

[0044] By controlling the start of the oil suction pump 2, oil samples are sequentially extracted from each sampling point at the front end of the sampling tube 1. The oil samples are then transported to the chromatograph 3 through the pipeline. The flow state and color of the oil samples are observed in real time. The chromatograph 3 performs chromatographic analysis on the flowing oil samples, automatically collects data and displays the results. After sampling and testing are completed, the cleaning mode can be switched as needed.

[0045] Example 2: Based on Example 1, the following is added: Reference Figures 1-4 The sampling tube 1 includes a connector 11 and a telescopic tube 12. The connector 11 is threadedly installed at the sampling reserved port of the transformer oil tank. The telescopic tube 12 is fixed by the connector 11, and the telescopic tube 12 and the connector 11 are mutually telescopic. The side wall of the telescopic tube 12 has multiple sampling ports 13, and the multiple sampling ports 13 are arranged along the axial direction of the telescopic tube 12.

[0046] Reference Figures 1-4 The connector 11 is connected to and installed at the sampling port of the transformer oil tank by a fixing nut 111. A sealing gasket 112 is provided at the contact surface between the front end of the connector 11 and the sampling port of the transformer oil tank. The connector 11 is sleeved on the telescopic tube 12, and a clamping nut 121 is provided at the rear end of the connector 11. The clamping nut 121 controls the clamping of the telescopic tube 12 by tightening the elastic inner wall. At least one sealing sleeve 122 is fixedly provided in the inner cavity of the connector 11. The sealing sleeve 122 is elastically sleeved on the telescopic tube 12. A limit ring 123 is fixedly provided on the outer wall of the telescopic tube 12.

[0047] Reference Figures 1-4 The sampling port 13 is individually connected to an inner cavity tube 131. The inner cavity tubes 131 are bundled together inside the telescopic tube 12. The end of the telescopic tube 12 is connected to a connecting hose 132. The connecting hose 132 contains multiple strands of segmented cavity tubes that are connected one by one to the inner cavity tubes 131.

[0048] The connector 11 is made of stainless steel and is installed at the sampling port of the transformer oil tank by means of threads. The front end of the connector 11 is equipped with a sealing gasket 112 on the contact surface with the oil tank sampling port. The sealing gasket 112 is preferably made of fluororubber (FKM) with a thickness of 2-3mm to ensure sealing performance. The connector 11 is fastened by the fixing nut 111 to ensure that the installation is firm and reliable. The rear end of the connector 11 is provided with a clamping nut 121. The clamping nut 121 is made of high-strength plastic or stainless steel. After tightening, the elastic compression of the inner wall achieves clamping and fixing of the telescopic tube 12.

[0049] At least one sealing sleeve 122 is fixedly provided in the inner cavity of the connector 11, for example, two sealing sleeves 122 are provided at intervals. The sealing sleeve 122 is made of oil-resistant rubber or polytetrafluoroethylene, which has good elasticity. It is sleeved on the outer wall of the telescopic tube 12 to achieve dynamic sealing. A limit ring 123 is fixedly provided on the outer wall of the telescopic tube 12. The limit ring 123 can be made of stainless steel or nylon to prevent the telescopic tube 12 from sliding excessively or falling out in the axial direction.

[0050] The telescopic tube 12 is a multi-section sleeve structure, preferably made of stainless steel, with an outer diameter of 10-15mm and a wall thickness of 1-2mm. The length can be customized according to the depth of the oil tank. Multiple sampling ports 13 (opening diameter 2-4mm) are evenly opened along the axial direction on the side wall of the telescopic tube 12. The edges of the sampling ports are chamfered to prevent the accumulation of impurities. Each sampling port 13 is connected to an inner tube 131. The inner tube 131 is made of polytetrafluoroethylene or PFA corrosion-resistant tubing with an inner diameter of 2-3mm. It is bundled inside the telescopic tube 12. The end of the telescopic tube 12 is connected to the connecting hose 132 through a clamp fixing component. The connecting hose 132 has a multi-cavity design and contains multiple segmented cavities inside. It is made of silicone or PVDF material. Each segmented cavity is connected to the corresponding inner tube 131 one by one to realize the independent transmission of multiple oil samples.

[0051] Screw the connector 11 into the sampling port of the transformer oil tank through the thread, and tighten it with the fixing nut 111. Confirm that the sealing gasket 112 at the front end of the connector 11 fits well with the oil tank opening to ensure that there is no oil leakage.

[0052] Loosen the clamping nut 121, adjust the telescopic tube 12 to insert it to the required depth and align it with each target sampling layer. After adjustment, tighten the clamping nut 121 to firmly fix the telescopic tube 12 by elastically compressing the inner wall and preventing it from loosening.

[0053] Through multiple sampling ports 13 on the side wall of the telescopic tube 12, the oil is guided into its respective inner cavity tube 131. The oil sample is bundled and transported along the inner cavity tube 131 to the end of the telescopic tube 12, and then output through the connecting hose 132 to each of the segmented cavities, ensuring that the samples are independent and do not cross.

[0054] The stainless steel components used are polished to reduce oil adhesion. The hoses and sealing elements are made of oil-resistant, high-temperature-resistant, and corrosion-resistant materials to meet the long-term use requirements of transformer oil sampling. All pipeline connections should be tested for tightness to prevent oil leakage and the entry of external impurities.

[0055] Example 3: Based on Example 1, the following is added: Reference Figure 2 and Figure 5 The oil suction pumps 2 are arranged side by side, and their rotors are connected in series and driven by the same shaft to the motor 21. The oil suction pumps 2 are connected to a control valve 22, which controls the switching of the circulation mode. The control valve 22 has a first circulation mode, an inner circulation mode, and a second circulation mode. An air filter 23 is provided on the pipeline connecting the oil suction pumps 2 and the sampling pipe 1.

[0056] The oil suction pump 2 is a small gear pump, installed side by side, with the rotors all connected in series through the same shaft and driven by the motor 21. The flow rate of each oil suction pump 2 should be between 0.5-2L / min to meet the requirements of online sampling and detection.

[0057] Motor 21 uses a miniature DC motor or a brushless motor (the recommended model is a 775 DC motor or a BLDC-3650 brushless motor), with a rated voltage of 12-24V and a rated power of 30-100W. It directly drives the series-connected shafts to enable multiple oil pumps to operate simultaneously.

[0058] The control valve 22 is a three-way electric ball valve or a rotary mechanical multi-way valve, made of 316L stainless steel or polytetrafluoroethylene (PTFE), and has three positions: first circulation position, internal circulation position, and second circulation position. By adjusting the control valve 22, the oil sample flow path can be switched to achieve different circulation modes.

[0059] First cycle setting: The oil sample flows from sampling tube 1 through oil suction pump 2 to the analysis unit or external collection container; Internal circulation mode: The oil sample circulates inside the oil suction pump 2, allowing the oil suction pump 2 to run dry; Second circulation mode: The oil sample can be switched to another flow path to achieve pipeline cleaning or system flushing.

[0060] Air filter 23 is installed on the connecting pipe between oil pump 2 and sampling pipe 1, and uses the same air filtration assembly as the infusion pipe.

[0061] Example 4: Based on Example 1, the following is added: Reference Figure 2 and Figure 5 The chromatograph 3 includes an observation stage 31, an observation mirror 32, and a detection head 33. The observation stage 31 is connected to the sampling tube 1 and the oil suction pump 2 and receives oil samples collected from the transformer oil tank by the sampling tube 1. The observation mirror 32 is installed above the observation stage 31 and the observation direction of the observation mirror 32 is towards the observation stage 31. The detection head 33 is connected to the observation stage 31 and performs chromatographic detection on the transformer oil sample flowing through the observation stage 31.

[0062] Reference Figure 2 and Figure 5 The observation platform 31 is provided with an oil passage chamber 311, which is divided into multiple individual chambers. A light-transmitting plate 312 is installed on one side of the oil passage chamber 311 and is sealed by the light-transmitting plate 312. A light-transmitting hole 313 is provided on the side of the oil passage chamber 311 opposite to the light-transmitting plate 312. An oil overflow tank 314 is provided at the end of the oil passage chamber 311. A light-transmitting lamp 321 is provided at the light-transmitting hole 313 and shines light towards the oil passage chamber 311. A magnifying lens 322 is provided on the observation mirror 32.

[0063] Reference Figure 2 and Figure 5 The detection head 33 is equipped with a chromatographic lamp 331 at its detection front end. The chromatographic lamp 331 and the detection head 33 are respectively located on both sides of the oil passage 311. The detection head 33 and the chromatographic lamp 331 are connected to the controller 332 through control wires. The detection head 33 is connected to the display 333 through data wires and the processor.

[0064] The observation platform 31 is made of stainless steel, chemical corrosion resistant glass and polyoxymethylene. It is used to receive transformer oil samples collected by sampling tube 1 and oil suction pump 2. The observation platform 31 has an oil passage chamber 311 inside. The oil passage chamber 311 is divided into multiple separate chambers by partitions. Each chamber is used to independently flow through one oil sample. The thickness of the chamber is 1-2 mm and the cross-sectional area is the same as the minimum inner cross-sectional area of ​​sampling tube 1.

[0065] A light-transmitting plate 312 is installed on one side of the oil passage cavity 311. The light-transmitting plate 312 is preferably a high-transmittance quartz glass or acrylic plate with a thickness of 3-5mm. It is sealed by mechanical buckles or bolts to ensure sealing and easy disassembly and maintenance. A light-transmitting hole 313 is provided on the side of the oil passage cavity 311 opposite to the light-transmitting plate 312. The diameter of the light-transmitting hole 313 is 5-10mm to facilitate the entry of light into the cavity.

[0066] An oil overflow tank 314 is provided at the end of the oil passage 311. The material can be stainless steel or polypropylene (PP) to collect excess oil and prevent oil from overflowing and contaminating the equipment.

[0067] A light-transmitting lamp 321 is installed outside the light-transmitting hole 313. It is recommended to use a high-brightness LED lamp. The light-transmitting lamp 321 shines towards the oil passage 311 to provide sufficient illumination for the observation mirror 32 and the detection head 33.

[0068] The observation mirror 32 is installed above the observation table 31, with the observation direction facing the observation table 31. It is used for manual or auxiliary observation of the state of the oil sample. The main body of the observation mirror 32 is made of optical glass, and the outer shell is made of aluminum alloy or ABS engineering plastic. The observation mirror 32 is equipped with a magnifying lens 322. It is recommended to use a 2-10x optical magnifying lens for the magnifying lens 322. The lens is made of high-transmittance glass, and the frame is made of stainless steel or engineering plastic.

[0069] The detection head 33 is installed on one side of the oil passage chamber 311, and the chromatographic lamp 331 is installed on the opposite side of the oil passage chamber 311. The detection head 33 adopts an integrated chromatographic detection module, such as a thermal conductivity detector (TCD) or a flame ionization detector (FID). It is recommended that the housing be made of 316L stainless steel and that the detection sensitivity be better than 1 ppm. The chromatographic lamp 331 adopts a high-brightness LED or xenon lamp of a specific wavelength to ensure a stable light source for chromatographic analysis.

[0070] The detection head 33 and the chromatographic lamp 331 are connected to the controller 332 via control wires. The controller 332 uses a PLC module or a single-chip microcomputer controller to realize synchronous control of the lamp and the detection head.

[0071] The detection head 33 is connected to the processor via a data cable. The processor can be a dedicated module for industrial analyzers. The data is finally output to the display 333, which uses an industrial-grade LCD screen to display the chromatographic detection results in real time.

[0072] When the oil suction pump 2 is started, the transformer oil sample is sent to the observation platform 31 through the sampling tube 1. The oil sample flows through each individual chamber of the oil cavity 311. Excess oil is collected by the overflow tank 314 to prevent overflow.

[0073] The light-transmitting lamp 321 illuminates the oil passage cavity 311 through the light-transmitting hole 313 to ensure sufficient light in the oil sample cavity. The state of the oil sample, such as color and impurities, is observed through the observation mirror 32 and the magnifying mirror 322. Under the illumination of the chromatographic lamp 331, the detection head 33 performs chromatographic analysis on the oil sample flowing through the oil passage cavity 311 to detect the composition information of the oil sample.

[0074] The detection head 33 collects chromatographic signals and outputs them to the controller 332 via control wires. The controller 332 controls the chromatographic lamp 331 and the detection head 33 to work synchronously. The detection data is transmitted to the processor via data wires and then processed and displayed in real time on the display 333.

[0075] Example 5: Based on Example 1, the following is added: Reference Figure 5 and Figure 6 The sampling tube 1, the oil suction pump 2, and the chromatograph 3 are connected to the cleaning tube 4. The cleaning tube 4 is connected to the cleaning solution tank 41 via the cleaning pump 42. The cleaning solution tank 41 is provided with a circulation port 411, which is matched with the end of the sampling tube 1. A spring valve 412 is provided at the connection between the cleaning tube 4 and the pipeline passage of the sampling tube 1, the oil suction pump 2, and the chromatograph 3. The spring valve 412 includes a state one of opening the cleaning tube 4 and blocking the pipeline passage, and a state two of blocking the cleaning tube 4 and releasing the pipeline passage.

[0076] Reference Figure 5 and Figure 6 The cleaning pipe 4 is connected to a blower 43. The blower 43 and the cleaning pump 42 are connected to the cleaning pipe 4 through a switching valve 431, and the switching valve 431 controls the switching of the connection to the cleaning pipe 4 in turn.

[0077] The cleaning solution tank 41 is used to store the cleaning solution. It is made of high-density polyethylene (HDPE) or 316L stainless steel, and the capacity can be selected from 5-20L according to system requirements. The cleaning solution tank 41 is equipped with a circulation port 411. The port size matches the end of the sampling tube 1, which facilitates the insertion of the sampling tube to achieve circulation cleaning. The circulation port 411 is made of the same material as the cleaning solution tank and is equipped with a sealing ring. The cleaning tube 4 is made of corrosion-resistant flexible tubing with an inner diameter of 6-12mm. One end is connected to the pipeline passage of the sampling tube 1, the oil suction pump 2, and the chromatograph 3, and the other end is connected to the cleaning pump 42 and the switching valve 431.

[0078] Spring valves 412 are installed at all pipeline connections. Spring valves 412 can switch between two states: state one is to connect the cleaning pipe 4 and block the main pipeline passage; state two is to block the cleaning pipe 4 and release the main pipeline passage. The spring valve 412 body is set to swing. Under normal conditions, the spring valve 412 is tightly attached to the cleaning pipe 4 and blocks it under the action of the spring. When the cleaning pipe 4 is flushed, the spring valve 412 is pushed up and blocks the pipeline on one side of the overflow tank 314. The cleaning solution is poured into the chromatograph 3, the oil suction pump 2 and the sampling tube 1, and finally returns to the cleaning solution tank 41.

[0079] The cleaning pump 42 is a miniature diaphragm pump or gear pump with a flow rate of 3-5 L / min to ensure efficient delivery of the cleaning fluid. The cleaning pump 42 is connected to the cleaning fluid tank 41 and the cleaning pipe 4.

[0080] Blower 43 is used for drying the pipeline. It is recommended to use a small centrifugal blower with an air volume of 50-100L / min. Blower 43 and cleaning pump 42 are connected to cleaning pipe 4 through switching valve 431. Switching valve 431 is an electric three-way ball valve or a knob-type mechanical three-way valve to realize that cleaning pump 42 and blower 43 are connected to cleaning pipe 4 in turn.

[0081] The above content is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the structure of the utility model, they should all fall within the protection scope of this utility model.

Claims

1. A portable online sampling and detection device for transformer oil chromatography, characterized in that: Includes a sampling tube (1), which is connected to a chromatograph (3) via an oil suction pump (2). The chromatograph (3) is movable and independently powered. The sampling tube (1) is a telescopic structure and is inserted into the transformer oil tank through the telescopic structure. The sampling front end of the sampling tube (1) corresponds to multiple sampling points in the transformer oil tank in sequence.

2. The portable online sampling and detection device for transformer oil chromatography according to claim 1, characterized in that: The sampling tube (1) includes a connector (11) and a telescopic tube (12). The connector (11) is installed at the sampling reserved port of the transformer oil tank by a thread. The telescopic tube (12) is fixed by the connector (11), and the telescopic tube (12) and the connector (11) are mutually telescopic. The side wall of the telescopic tube (12) has multiple sampling ports (13), and the multiple sampling ports (13) are arranged along the axial direction of the telescopic tube (12).

3. The portable online sampling and detection device for transformer oil chromatography according to claim 2, characterized in that: The connector (11) is connected and installed at the sampling port of the transformer oil tank by a fixing nut (111). A sealing gasket (112) is provided at the contact surface between the front end of the connector (11) and the sampling port of the transformer oil tank. The connector (11) is sleeved on the telescopic tube (12), and a clamping nut (121) is provided at the rear end of the connector (11). The clamping nut (121) controls the clamping of the telescopic tube (12) by tightening the elastic inner wall. At least one sealing sleeve (122) is fixedly provided in the inner cavity of the connector (11). The sealing sleeve (122) is elastically sleeved on the telescopic tube (12). A limit ring (123) is fixedly provided on the outer wall of the telescopic tube (12).

4. The portable online sampling and detection device for transformer oil chromatography according to claim 3, characterized in that: The sampling port (13) is individually connected to an inner cavity tube (131). The inner cavity tubes (131) are bundled together inside the telescopic tube (12). The end of the telescopic tube (12) is connected to a connecting hose (132). The connecting hose (132) contains multiple strands of segmented cavity tubes and is connected to the inner cavity tubes (131) one by one.

5. The portable online sampling and detection device for transformer oil chromatography according to claim 1, characterized in that: The oil suction pumps (2) are arranged side by side, and the rotors are connected in series and driven to the motor (21) through the same rotating shaft. The oil suction pumps (2) are connected to a control valve (22) and the circulation mode is switched through the control valve (22). The control valve (22) has a first circulation mode, an inner circulation mode and a second circulation mode. An air filter (23) is provided on the pipeline connecting the oil suction pumps (2) and the sampling pipe (1).

6. The portable online sampling and detection device for transformer oil chromatography according to claim 1, characterized in that: The chromatograph (3) includes an observation stage (31), an observation mirror (32), and a detection head (33). The observation stage (31) is connected to the sampling tube (1) and the oil suction pump (2) and receives the oil sample collected from the transformer oil tank by the sampling tube (1). The observation mirror (32) is installed above the observation stage (31) and the observation direction of the observation mirror (32) is towards the observation stage (31). The detection head (33) is connected to the observation stage (31) and performs chromatographic detection on the transformer oil sample flowing through the observation stage (31).

7. The portable online sampling and detection device for transformer oil chromatography according to claim 6, characterized in that: The observation platform (31) is provided with an oil passage chamber (311), which is divided into multiple individual chambers. A light-transmitting plate (312) is installed on one side of the oil passage chamber (311) and is sealed by the light-transmitting plate (312). A light-transmitting hole (313) is provided on the side of the oil passage chamber (311) opposite to the light-transmitting plate (312). An oil overflow tank (314) is provided at the end of the oil passage chamber (311). A light-transmitting lamp (321) is provided at the light-transmitting hole (313) and the light-transmitting lamp (321) shines light towards the oil passage chamber (311). A magnifying glass (322) is provided on the observation mirror (32).

8. The portable online sampling and detection device for transformer oil chromatography according to claim 7, characterized in that: The detection head (33) is equipped with a chromatographic lamp (331) at the detection front end. The chromatographic lamp (331) and the detection head (33) are respectively located on both sides of the oil passage cavity (311). The detection head (33) and the chromatographic lamp (331) are connected to the controller (332) through control wires. The detection head (33) is connected to the display (333) through data wires and the processor.

9. The portable online sampling and detection device for transformer oil chromatography according to claim 1, characterized in that: The sampling tube (1), the oil suction pump (2) and the chromatograph (3) are connected to the cleaning tube (4). The cleaning tube (4) is connected to the cleaning liquid tank (41) through the cleaning pump (42). The cleaning liquid tank (41) is provided with a circulation port (411). The circulation port (411) matches the end of the sampling tube (1). A spring valve (412) is provided at the connection between the cleaning tube (4) and the pipeline passage of the sampling tube (1), the oil suction pump (2) and the chromatograph (3). The spring valve (412) includes a state one of connecting the cleaning tube (4) and blocking the pipeline passage and a state two of blocking the cleaning tube (4) and releasing the pipeline passage.

10. The portable online sampling and detection device for transformer oil chromatography according to claim 9, characterized in that: The cleaning pipe (4) is connected to a blower (43). The blower (43) and the cleaning pump (42) are connected to the cleaning pipe (4) through a switching valve (431), and the switching valve (431) controls the switching of the connection to the cleaning pipe (4) in turn.

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