Electric locomotive transformer oil gas chromatography full sealing oil taking equipment

Abstract

This utility model relates to the field of oil sampling equipment, and discloses a fully sealed oil sampling device for electric locomotive transformer oil by gas chromatography. It includes an oil sampling sealed box with a vacuum chamber inside the front side. Inside the vacuum chamber is a sealed oil sampling mechanism, which includes a sealed oil sampling syringe, an outer conduit, an exhaust valve, a sealing plug, a tightening handle, an oil drain pipe, a fixing plate, and a locking piece. The oil sampling syringe is placed inside the vacuum chamber. When the syringe is almost full of oil with only a small amount of air remaining, the operator opens the exhaust valve and then closes it, stopping the pump. At this point, the sealed oil sampling syringe is filled with pure, bubble-free transformer oil sample. Throughout the process, the oil sampling sealed box and its internal components form a completely closed system, effectively isolating the external environment and ensuring the purity and representativeness of the oil sample.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction equipment, and in particular to a fully sealed gas chromatography oil extraction equipment for electric locomotive transformer oil. Background Technology

[0002] During long-term operation, the insulating oil and solid insulation materials inside electric locomotive transformers age and decompose due to electrical and thermal stress, producing various gases such as hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, and carbon dioxide. Changes in the composition and content of these gases dissolved in the insulating oil can sensitively reflect the presence of latent faults inside the transformer, such as localized overheating, arc discharge, or aging of insulation materials. Therefore, regularly analyzing the dissolved gases in the transformer oil of electric locomotives is an important means of timely detection of early internal faults, assessment of equipment health, and prevention of accidents.

[0003] Sampling from oil-filled electrical equipment such as transformers in operating electric locomotives faces numerous challenges in current technologies. Traditional sampling methods are often complex and difficult to guarantee the airtightness of the sample. For example, manual sampling using methods such as funnel diversion is not only inefficient but also makes it difficult to avoid the introduction of air and impurities, leading to oil sample contamination and affecting the accuracy of subsequent analysis. Air or impurities mixed in the oil sample may interfere with gas detection or even introduce false gas components, causing misjudgments. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a fully sealed oil extraction device for transformer oil gas chromatography in electric locomotives, which solves the above problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fully sealed oil extraction device for electric locomotive transformer oil by gas chromatography, comprising an oil extraction sealed box, a vacuum chamber located inside the front side of the oil extraction sealed box, and a sealed oil extraction mechanism located inside the vacuum chamber. The sealed oil extraction mechanism includes a sealed oil extraction syringe, an outer guide tube, an exhaust valve, a sealing plug, a tightening handle, an oil drain pipe, a fixing plate, and a locking piece. The oil extraction syringe is located inside the vacuum chamber, and an outer guide tube is connected to the front side of the oil extraction syringe. The front end of the outer guide tube penetrates a transparent panel, which is fixedly connected to the front side of the oil extraction sealed box. An exhaust valve is located at the lower end of the outer guide tube, and a transformer oil pipe is connected to the lower end of the exhaust valve.

[0006] Preferably, the sealed oil extraction syringe is provided with fixing plates on both the left and right sides, and both fixing plates are fixedly connected to the oil extraction sealing box.

[0007] Preferably, one of the fixing plates is hinged to the front side with a locking piece, which is fitted to the front side of the sealed oil extraction syringe.

[0008] Preferably, a tightening handle is threadedly connected between one side of the locking piece and the other fixing plate.

[0009] Preferably, two vacuum suction nozzles are provided at the bottom of the vacuum chamber, and each of the two vacuum suction nozzles is connected to a gas guide tube at its upper end.

[0010] Preferably, a vacuum pump is connected to the end of the air guide tube away from the vacuum suction nozzle, and the vacuum pump is fixedly connected to the rear side of the oil sampling and sealing box.

[0011] Preferably, sealing plates are provided on both the left and right sides of the oil extraction sealing box, and fastening screws are provided at the four corners of the two sealing plates where they are connected to the oil extraction sealing box.

[0012] Beneficial effects

[0013] This invention provides a fully sealed gas chromatography oil extraction device for electric locomotive transformer oil. Compared with the prior art, it has the following advantages:

[0014] 1. In this utility model, the oil sampling sealing mechanism securely places the oil sampling sealing box in an easily accessible position. The operator observes the internal structure through a transparent panel and aligns the front end of the outer conduit with the pre-reserved oil sampling port on the transformer. The operator pushes the outer conduit until its front end (usually equipped with a special sealing head) is tightly inserted into the transformer's oil sampling port. At this point, a preliminary seal is formed between the outer conduit and the transformer's oil circuit. The vent valve at the lower end of the outer conduit is closed to prevent oil leakage in the initial stage. The liquid pump at the top of the oil sampling sealing box is then activated. The suction end of the liquid pump is connected to the sealed oil sampling syringe via a pipe. When the liquid pump starts working, it generates a strong negative pressure (suction force) in the sealed oil sampling syringe and its connecting pipes. Under the negative pressure generated by the liquid pump, transformer oil is drawn into the sealed oil sampling syringe through the external conduit and the exhaust valve (which remains closed at this time). As the oil continues to enter the syringe, the air inside the syringe is gradually compressed and accumulates at the front of the syringe. When the oil is about to fill the syringe, the suction force of the liquid pump will further push the air at the front of the syringe through the external conduit and attempt to expel it from the transformer oil pipe end. When the syringe is almost full of oil and only a small amount of air remains, the operator opens the exhaust valve in time and then closes the exhaust valve. The liquid pump stops working. At this time, the sealed oil sampling syringe is filled with pure, bubble-free transformer oil sample. Throughout the process, the oil sampling sealed box and its internal components constitute a completely closed system, effectively isolating the external environment and ensuring the purity and representativeness of the oil sample.

[0015] 2. In this utility model, by means of a vacuum suction nozzle, when extracting oil samples, the air in the vacuum chamber is sucked out by a vacuum pump, and a low-pressure vacuum environment is formed inside the vacuum chamber. Atmospheric pressure is used to force the oil sample into the sampling system. At the same time, good sealing prevents air from entering the oil sample flow path in the reverse direction, thereby obtaining a pure oil sample without extra air, so as to meet the requirements of high-precision gas chromatography detection and ensure that the detection results can truly reflect the internal state of the transformer or instrument transformer. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the front three-dimensional structure of the fully sealed gas chromatography oil extraction device for electric locomotive transformers proposed in this utility model.

[0017] Figure 2 This is a schematic diagram of the rear three-dimensional structure of the fully sealed gas chromatography oil extraction device for electric locomotive transformers proposed in this utility model.

[0018] Figure 3 This is a cross-sectional structural schematic diagram of the fully sealed gas chromatography oil extraction device for electric locomotive transformers proposed in this utility model.

[0019] Figure 4 This is a front view cross-sectional structural diagram of the fully sealed oil extraction device for electric locomotive transformer oil by gas chromatography proposed in this utility model.

[0020] Legend:

[0021] 1. Oil extraction sealing box; 2. Sealed oil extraction mechanism; 201. Sealed oil extraction syringe; 202. Outer guide tube; 203. Exhaust valve; 204. Sealing plug; 205. Tightening handle; 206. Oil drain pipe; 207. Fixing plate; 208. Positioning piece; 209. Transformer oil pipe; 3. Vacuum pump; 4. Air guide tube; 5. Vacuum suction nozzle; 6. Sealing plate; 7. Fastening screw; 8. Vacuum chamber; 9. Transparent panel. Detailed Implementation

[0022] 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.

[0023] Please see Figures 1-4 This utility model provides two technical solutions, specifically including the following embodiments:

[0024] Example 1:

[0025] A fully sealed oil extraction device for transformer oil by gas chromatography in electric locomotives includes an oil extraction sealed box 1. A vacuum chamber 8 is located inside the front of the oil extraction sealed box 1. A sealed oil extraction mechanism 2 is located inside the vacuum chamber 8. The sealed oil extraction mechanism 2 includes a sealed oil extraction syringe 201, an outer conduit 202, an exhaust valve 203, a sealing plug 204, a tightening handle 205, an oil drain pipe 206, a fixing plate 207, and a locking piece 208. The oil extraction syringe is located inside the vacuum chamber 8. An outer conduit 202 is connected to the front of the oil extraction syringe. The front end of the outer conduit 202 penetrates a transparent panel 9, which is fixedly connected to the front of the oil extraction sealed box 1. 2. An exhaust valve 203 is provided at the lower end, and a transformer oil pipe 209 is connected to the lower end of the exhaust valve 203. Fixing plates 207 are provided on both the left and right sides of the sealed oil sampling syringe 201. Both fixing plates 207 are fixedly connected to the oil sampling sealed box 1. A locking piece 208 is hinged to the front side of one of the fixing plates 207. The locking piece 208 is fitted to the front side of the sealed oil sampling syringe 201. A tightening handle 205 is threadedly connected between one side of the locking piece 208 and the other fixing plate 207. A liquid pump is provided at the top inside the oil sampling sealed box 1. It is not shown in the figure. The liquid pump's suction end is connected to the sealed oil sampling syringe 201 through a pipe.

[0026] During operation, the oil sampling sealing box 1 is securely placed in an easily accessible location. The operator observes the internal structure through the transparent panel 9 and aligns the front end of the outer conduit 202 with the pre-reserved oil sampling port on the transformer. The operator pushes the outer conduit 202 until its front end, typically equipped with a special sealing head, is tightly inserted into the transformer's oil sampling port. At this point, a preliminary seal is formed between the outer conduit 202 and the transformer's oil circuit. The vent valve 203 at the lower end of the outer conduit 202 is closed to prevent oil leakage in the initial stage. The liquid pump at the top of the oil sampling sealing box 1 is then started. The suction end of the liquid pump is connected to the sealed oil sampling syringe 201 via a pipe. When the liquid pump starts working, it generates a strong negative pressure suction force within the sealed oil sampling syringe 201 and its connecting pipes. Under the negative pressure generated by the liquid pump, transformer oil is drawn into the sealed oil sampling syringe 201 through the outer conduit 202 and the vent valve 203 (which remains closed). As oil continuously enters the syringe, the air inside is gradually compressed and accumulates at the front of the syringe. When the syringe is almost full of oil, the suction force of the liquid pump further pushes the air at the front of the syringe through the outer conduit 202 and attempts to expel it from the transformer oil pipe 209. When the syringe is almost full of oil with only a small amount of air remaining, the operator opens the vent valve 203 at the appropriate time. At this point, the remaining air in the syringe, under the continuous suction of the liquid pump or the slight positive pressure inside the syringe, is discharged into the transformer oil tank through the opened vent valve 203 and the transformer oil pipe 209, instead of entering the oil sample. The vent valve 203 is then closed, and the liquid pump stops working. At this point, the sealed oil sampling syringe 201 is filled with pure, bubble-free transformer oil sample. Throughout the process, the oil sampling sealed box 1 and its internal components constitute a completely closed system, effectively isolating the external environment and ensuring the purity and representativeness of the oil sample.

[0027] Example 2:

[0028] Based on Embodiment 1, two vacuum suction nozzles 5 are provided at the bottom of the vacuum chamber 8. Each of the two vacuum suction nozzles 5 is connected to a gas guide pipe 4 at its upper end. The end of the gas guide pipe 4 away from the vacuum suction nozzle 5 is connected to a vacuum pump 3. The vacuum pump 3 is fixedly connected to the rear side of the oil sampling sealing box 1. Sealing plates 6 are provided on both the left and right sides of the oil sampling sealing box 1. Fastening screws 7 are provided at the four corners of the two sealing plates 6 where they are connected to the oil sampling sealing box 1. The air in the vacuum chamber 8 is sucked out by the vacuum pump 3, forming a low-pressure vacuum environment inside the vacuum chamber 8. The oil sample is forced into the sampling system using atmospheric pressure. At the same time, the good sealing prevents air from entering the oil sample flow path in the reverse direction, thereby obtaining a pure oil sample without extra air, which meets the requirements of high-precision gas chromatography detection and ensures that the detection results can truly reflect the internal state of the transformer or instrument transformer.

[0029] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A full-sealed oil taking equipment for power locomotive transformer oil gas chromatography, comprising an oil taking sealed box (1), characterized in that: The oil sampling sealing box (1) has a vacuum chamber (8) inside its front side. The vacuum chamber (8) has a sealing oil sampling mechanism (2) inside its interior. The sealing oil sampling mechanism (2) includes a sealing oil sampling syringe (201), an outer conduit (202), an exhaust valve (203), a sealing plug (204), a tightening handle (205), an oil drain pipe (206), a fixing plate (207), and a locking piece (208). The oil sampling syringe is located inside the vacuum chamber (8). The front side of the oil sampling syringe is connected to an outer conduit (202). The front end of the outer conduit (202) passes through a transparent panel (9). The transparent panel (9) is fixedly connected to the front side of the oil sampling sealing box (1). An exhaust valve (203) is located at the lower end of the outer conduit (202). The lower end of the exhaust valve (203) is connected to a transformer oil pipe (209). ​ 2. The full-sealed oil taking equipment for electric locomotive transformer oil gas phase chromatogram according to claim 1, characterized in that: The sealed oil extraction syringe (201) is provided with fixing plates (207) on both the left and right sides, and both fixing plates (207) are fixedly connected to the oil extraction sealing box (1).

3. The fully sealed oil extraction device for electric locomotive transformer oil gas chromatography according to claim 2, characterized in that: One of the fixing plates (207) has a locking piece (208) hinged to its front side, and the locking piece (208) is fitted to the front side of the sealed oil extraction syringe (201).

4. The fully sealed oil extraction device for electric locomotive transformer oil gas chromatography according to claim 3, characterized in that: A tightening handle (205) is threadedly connected between one side of the locking piece (208) and the other fixing plate (207).

5. The fully sealed oil extraction device for electric locomotive transformer oil gas chromatography according to claim 1, characterized in that: The vacuum chamber (8) has two vacuum suction nozzles (5) at the bottom, and the upper ends of the two vacuum suction nozzles (5) are connected to air guide tubes (4).

6. The fully sealed oil extraction device for electric locomotive transformer oil gas chromatography according to claim 5, characterized in that: The end of the air guide tube (4) away from the vacuum suction nozzle (5) is connected to a vacuum pump (3), which is fixedly connected to the rear side of the oil extraction sealing box (1).

7. The fully sealed oil extraction device for electric locomotive transformer oil gas chromatography according to claim 1, characterized in that: The oil extraction sealing box (1) is provided with sealing plates (6) on both the left and right sides, and fastening screws (7) are provided at the four corners of the two sealing plates (6) and the connection positions between them and the oil extraction sealing box (1).

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