Oil sampling tool for traction transformer of motor train unit
By designing a sampling fixture for traction transformer oil of high-speed trains, the problems of time-consuming and labor-intensive sampling and oil waste were solved, oil flow control and purity improvement were achieved, and the safety and efficiency of the operation were ensured.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-03-13
Smart Images
Figure CN223992728U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of overhaul and maintenance of EMU traction systems, and specifically to a tooling for sampling oil from EMU traction transformers. Background Technology
[0002] The descriptions in this section provide background information related to this disclosure only and do not constitute prior art. In related technologies, traction transformers are key equipment for railway power supply, converting local grid voltage into the voltage required for train operation. Prolonged operation causes transformer oil to age and deteriorate, affecting insulation, heat dissipation, and arc-extinguishing performance. By analyzing the gas composition, content, and other indicators in oil samples, it is possible to quickly and accurately diagnose problems such as oil spark discharge, oil overheating, equipment overload, and low insulation performance in traction transformers, enabling early warning and prevention of faults and reducing the impact of sudden failures on train operation safety.
[0003] On-site oil sampling of traction transformers mainly employs traditional manual sampling. This involves connecting a rubber hose to a valve at the bottom of the transformer and a glass container, then opening the valve to extract the oil sample. Manual oil sampling relies heavily on the experience and skills of the operators, is slow, and carries safety risks such as contact with hazardous substances and electric shock. Summary of the Invention
[0004] In view of this, this application provides a sampling tool for traction transformer oil of EMU trains, which can improve sampling efficiency.
[0005] To achieve the above objectives, this application employs the following technical solution:
[0006] A sampling fixture for traction transformer oil in a high-speed train is characterized by: a valve body containing an inner cavity; an air inlet, an oil outlet, and an installation port communicating with the inner cavity; an air inlet connected to an air inlet valve; an oil outlet connected to an oil outlet valve; an installation port that can be fitted onto the oil outlet base of the traction transformer housing; an internal thread on the inner wall of the installation port for threaded connection with the oil outlet base of the traction transformer housing; and a rotating column rotatably connected to the valve body for unscrewing the oil outlet plug in the oil outlet base. One end of the rotating column extends out of the valve body, and the other end is located in the inner cavity of the valve body and has a first end that engages with the oil outlet plug, so that during rotation, the first end can rotate and unscrew the oil outlet plug along with the rotating column.
[0007] The above-mentioned sampling fixture for traction transformer oil of EMU trains is described above. The valve body is screwed onto the oil outlet base of the traction transformer box, and the oil drain plug is opened by rotating the column. This can effectively prevent impurities in the environment from entering the oil sample or gases in the oil sample from escaping into the air during manual sampling. Moreover, both the air inlet and oil outlet on the valve body are equipped with valves to control the oil flow rate. Sampling can be stopped as needed. Compared with traditional operations, this effectively reduces oil waste and improves sampling efficiency.
[0008] In some embodiments, the air inlet and oil outlet are arranged opposite to each other, and the central axes of the air inlet and oil outlet are perpendicular to the central axis of the mounting port.
[0009] In some implementations, the air inlet faces upward and the oil outlet faces downward during use.
[0010] In some embodiments, the sampling fixture further includes a nut, a pressing member, and a first sealing ring. A connector is fixedly provided on the opposite side of the mounting port of the valve body. A groove is provided inside the connector, and a first through hole communicating with the inner cavity is provided at the bottom of the groove. The pressing member includes a first column positioned in the groove and a second column fixed on the first column with an outer diameter larger than the first column. The second column is engaged at the end of the connector. A second through hole extending axially is provided in the middle of the pressing member. An external thread is provided on the outer wall of the connector. A base plate is provided at one end of the nut, and a third through hole communicating with the inner hole of the nut is provided on the base plate. The internal thread of the nut is threadedly connected to the external thread of the connector. The rotating column extends into the inner cavity through the third through hole of the nut, the second through hole of the pressing member, and the first through hole. The first sealing ring is sleeved on the outer circumference of the rotating column and is located between the second column of the pressing member and the base plate of the nut to form a sealing connection. The rotating column is clearance-fitted with the third through hole, the second through hole, and the first through hole. The first sealing ring ensures that the liquid inside the valve body does not leak out. The rotating column is clearance-fitted and can not only rotate but also extend and retract to accommodate the stroke of the screw. While the rotating column has no mechanical limit, there is friction between it and the first sealing ring, preventing it from detaching from the valve body without external force.
[0011] In some embodiments, the end of the rotating column exposed outside the valve body has a second end that facilitates the rotation of the rotating column by a tool.
[0012] In some embodiments, a limiting ring is further provided on the outer wall of the rotating column, located between the second end and the first end and outside the valve body. This limiting ring can prevent the rotating column from completely entering the valve body.
[0013] In some embodiments, a spare sealing ring, located outside the valve body and secured to the limiting ring, is also fitted onto the outer wall of the rotating column. When the first sealing ring fails, the spare sealing ring can be removed and installed in the position of the original first sealing ring.
[0014] In some embodiments, both the first end and the second end are square. The first end can also be in the shape of a line or a cross, depending on the specific circumstances, and the second end can be triangular or other shapes.
[0015] As can be seen from the above technical solution, this application has at least the following advantages and positive effects:
[0016] 1. Saves sampling time and improves work efficiency. The use of specialized tooling effectively solves the problems of traditional operations being not only time-consuming and labor-intensive, but also unable to control the oil sample; the tooling has an air inlet at one end and an oil outlet at the other end, making the sampling operation more efficient.
[0017] 2. Controllable sampling process. The sampling fixture allows for control of the oil flow rate, enabling sampling and stopping as needed, effectively reducing oil waste compared to traditional methods.
[0018] 3. Improve oil sample purity. The sealed structure effectively prevents impurities from the environment from entering the oil sample or gases from the oil sample from escaping into the air during manual sampling.
[0019] 4. Effectively maintains a clean working environment. The sampling fixture has superior sealing performance, preventing oil from seeping into the equipment compartment during operation, compared to traditional methods.
[0020] 5. Ensure flexible and reliable operation. Valves at both ends of the sampling workpiece can be connected to plastic or PU tubing, and the length can be freely controlled according to the actual operation, meeting the operating conditions in different environments. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;
[0022] Figure 2 This is an exploded view of an embodiment of this application;
[0023] Figure 3 This is an internal structure diagram of an embodiment of this application;
[0024] Figure 4 This is a usage state diagram of an embodiment of this application.
[0025] Labeling Explanation: 1. Valve body; 11. Inner cavity; 12. Air inlet; 13. Oil outlet; 14. Mounting port; 15. Connector; 151. Groove; 16. First through hole; 2. Air inlet valve; 3. Oil outlet valve; 4. Rotating column; 41. First end; 42. Second end; 43. Limiting ring; 5. Nut; 51. Base plate; 52. Third through hole; 6. Top pressure component; 61. First column; 62. Second column; 63. Second through hole; 7. First sealing ring; 8. Spare sealing ring; 9. Oil outlet base; 10. Oil drain plug. Detailed Implementation
[0026] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings. The terminology used in the embodiments section of this application is only for explaining specific embodiments and is not intended to limit the application.
[0027] See Figures 1 to 4 This application provides a sampling fixture for traction transformer oil of a high-speed train, including a valve body 1. The valve body 1 has an inner cavity 11. The valve body 1 is also provided with an air inlet 12, an oil outlet 13 and an installation port 14 communicating with the inner cavity 11. The air inlet 12 is connected to an air inlet valve 2, and the oil outlet 13 is connected to an oil outlet valve 3. The installation port 14 can be sleeved onto the oil outlet base 9 of the traction transformer housing. The inner wall of the installation port 14 is provided with an internal thread for threaded connection with the oil outlet base 9 of the traction transformer housing. The valve body 1 is also rotatably connected with a rotating column 4 for unscrewing the oil outlet plug 10 in the oil outlet base 9. One end of the rotating column 4 extends out of the valve body 1, and the other end is located in the inner cavity 11 of the valve body 1 and has a first end 41 that engages with the oil outlet plug 10. So that during the rotation of the rotating column 4, the first end 41 can rotate and unscrew the oil outlet plug 10 together.
[0028] The sampling fixture for traction transformer oil of this EMU is connected to the oil outlet base 9 of the traction transformer box by rotating the valve body 1, and the oil drain plug 10 is opened by rotating the column 4. This can effectively prevent impurities in the environment from entering the oil sample or the gas in the oil sample from escaping into the air during manual sampling. Moreover, the air inlet 12 and oil outlet 13 on the valve body 1 are equipped with valves to control the oil flow rate. The sampling can be stopped as needed. Compared with traditional operations, this effectively reduces oil waste and improves sampling efficiency.
[0029] The air inlet 12 and the oil outlet 13 are arranged opposite to each other, and the central axis of the air inlet 12 and the oil outlet 13 is perpendicular to the central axis of the mounting port 14.
[0030] When in use, the air inlet 12 should face upwards and the oil outlet 13 should face downwards.
[0031] The sampling fixture also includes a nut 5, a pressing member 6, and a first sealing ring 7. A connector 15 is fixedly installed on the opposite side of the mounting port 14 of the valve body 1. A groove 151 is provided inside the connector 15, and a first through hole 16 communicating with the inner cavity 11 is provided at the bottom of the groove 151. The pressing member 6 includes a first column 61 positioned and installed in the groove 151, and a second column 62 fixedly installed on the first column 61 with an outer diameter larger than the first column 61. The second column 62 is engaged at the end of the connector 15. A second through hole 63 extending axially is provided in the middle of the pressing member 6. The connector 15... The outer wall of the nut 5 is provided with external threads. One end of the nut 5 is provided with a base plate 51. The base plate 51 is provided with a third through hole 52 communicating with the inner hole of the nut 5. The internal thread of the nut 5 is threadedly connected to the external thread of the connector 15. The rotating column 4 passes through the third through hole 52 of the nut 5, the second through hole 63 of the pressing member 6 and the first through hole 16 and extends into the inner cavity 11. The first sealing ring 7 is sleeved on the outer circumference of the rotating column 4 and is located between the second column body 62 of the pressing member 6 and the base plate 51 of the nut 5 to form a sealing connection. The rotating column 4 and the third through hole 52, the second through hole 63 and the first through hole 16 are all clearance fit. The first sealing ring 7 can ensure that the liquid inside the valve body 1 will not flow out. The rotating column 4 is clearance fit and can not only rotate but also extend and retract to accommodate the stroke of the screw. The rotating column 4 is not mechanically limited, but there is friction between the rotating column 4 and the first sealing ring 7. Without the action of external force, the rotating column 4 will not come out of the valve body 1.
[0032] The end of the rotating column 4 exposed outside the valve body 1 has a second end 42 for easy tool rotation of the rotating column 4.
[0033] A limiting ring 43 is also provided on the outer wall of the rotating column 4, located between the second end 42 and the first end 41 and outside the valve body 1. This limiting ring 43 can prevent the rotating column 4 from entering the valve body 1 completely.
[0034] The outer wall of the rotating column 4 is also fitted with a spare sealing ring 8 located outside the valve body 1 and locked onto the limiting ring 43. When the first sealing ring 7 is damaged and fails, the spare sealing ring 8 can be removed and installed in the position of the original first sealing ring 7 for use.
[0035] Both the first end 41 and the second end 42 are square. The first end 41 can also be in the shape of a straight line or a cross, depending on the actual situation, and the second end 42 can also be triangular or other shapes.
[0036] The following is a brief description of the working process and usage method of a high-speed train traction transformer oil sampling fixture according to the above embodiments:
[0037] Before using the sampling fixture for traction transformer oil, ensure that the air inlet valve 2 and oil outlet valve 3 on the sampling fixture are in the closed position; use an adjustable wrench to loosen the mounting cap on the oil outlet base 9 on the traction transformer housing and remove the mounting cap; align the rotating body inside the sampling fixture with the oil outlet plug 10, and tighten the mounting port 14 of the valve body 1 onto the oil outlet base 9. After tightening, ensure that the sampling fixture is in a vertical position, with the air inlet 12 on top and the oil outlet 13 on the bottom; use an adjustable wrench to rotate the rotating column 4 to unscrew the oil outlet plug 10, allowing the oil to flow into the inner cavity 11; connect the PU tube of the oil outlet 13 to the sampling bottle; open the air inlet valve 2 and oil outlet valve 3 to drain the oil, controlling the oil flow rate by adjusting the valve opening to meet the requirements for oil sampling.
[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them; although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A EMU traction transformer oil sampling tool, characterized in that: The valve body is provided with an inner cavity, an air inlet, an oil outlet and a mounting port, the air inlet is connected with an air inlet valve, the oil outlet is connected with an oil outlet valve, the mounting port is sleeved on the oil outlet base of the traction transformer box, the inner wall of the mounting port is provided with internal threads for screwing with the oil outlet base of the traction transformer box, the valve body is further rotationally connected with a rotating column for rotating out the oil outlet plug in the oil outlet base, one end of the rotating column extends out of the valve body, the other end is located in the inner cavity of the valve body and has a first end head for cooperating with the oil outlet plug, so that the first end head can rotate out the oil outlet plug during the rotation of the rotating column.
2. The EMU traction transformer oil sampling tool according to claim 1, characterized in that: The air inlet and the oil outlet are oppositely arranged, and the central axes of the air inlet and the oil outlet are perpendicular to the central axis of the mounting port.
3. The EMU traction transformer oil sampling tool according to claim 1, characterized in that: During use, the air inlet faces upward, and the oil outlet faces downward.
4. The EMU traction transformer oil sampling tool according to claim 1, characterized in that: The sampling tool further comprises a nut, a pressing piece and a first sealing ring, the valve body is fixedly provided with a connecting head on the opposite side of the mounting port, the connecting head is provided with a groove, and the bottom of the groove is provided with a first through hole communicating with the inner cavity; the pressing piece comprises a first column body positioned in the groove and a second column body fixedly arranged on the first column body and having an outer diameter larger than that of the first column body, and the second column body is clamped at the end of the connecting head; the middle part of the pressing piece is provided with a second through hole extending in the axial direction thereof, the outer wall of the connecting head is provided with external threads, one end of the nut is provided with a bottom plate, the bottom plate is provided with a third through hole communicating with the inner hole of the nut, the internal threads of the nut are threadedly connected with the external threads of the connecting head, the rotating column extends into the inner cavity through the third through hole of the nut, the second through hole of the pressing piece and the first through hole, the first sealing ring is sleeved on the outer periphery of the rotating column and located between the second column body of the pressing piece and the bottom plate of the nut to form a sealed connection, and the rotating column is gap-fitted with the third through hole, the second through hole and the first through hole.
5. The EMU traction transformer oil sampling tool according to claim 1, characterized in that: The end of the rotating column exposed outside the valve body has a second end head for facilitating the rotation of the rotating column by a tool.
6. The EMU traction transformer oil sampling tool of claim 5, wherein: The outer wall of the rotating column is further provided with a limiting ring located between the second end head and the first end head and outside the valve body.
7. The EMU traction transformer oil sampling tool of claim 6, wherein: The outer wall of the rotating column is further sleeved with a standby sealing ring located outside the valve body and clamped on the limiting ring.
8. The EMU traction transformer oil sampling tool of claim 5, wherein: The first end head and the second end head are both quadrangular.