An oil sampling valve for sampling oil from an oil-immersed current or voltage transformer.

Abstract

This utility model discloses an oil sampling valve for sampling oil from an oil-immersed current or voltage transformer. The oil sampling valve is connected to an oil storage tank through an oil sampling port. The valve structure consists of a valve core tube installed in the inner cavity of the valve body via a second and third sealing ring. An externally threaded tube is provided on the valve core tube, which connects to the oil outlet interface tube. An oil outlet push rod is installed in the tube hole of the valve core tube. The diameter of the upper half of the oil outlet push rod is smaller than the diameter of the tube hole of the valve core tube, forming an oil inlet chamber. An annular groove is provided in the middle of the outer wall of the valve core tube, and the annular groove communicates with the oil inlet chamber through a set oil passage. An oil outlet pipe located in the middle of the valve body communicates with the annular groove of the valve core tube. The oil outlet push rod located at the lower part of the oil inlet chamber cooperates with the tube hole of the valve core tube through a fourth sealing ring. This utility model has a reasonable structure, avoids the danger of workers operating at heights, avoids sampling oil while the circuit is electrified, reduces labor intensity, and improves work efficiency.

Description

Technical Field

[0001] This utility model relates to an oil sampling valve for taking oil samples, and more particularly to an oil sampling valve for taking oil samples from an oil-immersed current or voltage transformer. Background Technology

[0002] With the development of the social economy and the improvement of renewable energy power generation technology, various testing methods for power operation equipment have diversified. However, traditional oil sampling equipment has not been upgraded or improved in terms of user-friendliness. When these oil-immersed power equipment are in operation, the requirements for the gas and moisture content in the oil are high. The operating condition of the equipment can be judged based on the various media in the oil, which is the only standard for judging the safe operation of the equipment. According to the instructions and standards of the State Grid Corporation of China, such as transformers, on-load tap changers, and voltage transformers, periodic sampling and testing should be carried out as required to ensure the safe and reliable operation of the main equipment.

[0003] Traditional transformer manufacturers need to sample and monitor the oil inside current transformers and voltage transformers during product manufacturing and operation. This is to obtain oil sample data and analyze product failure types during testing and customer use. Currently, in the industry, the upper oil sampling valves generally do not adopt a downward-leading structure. The current transformers or voltage transformers are relatively high, requiring operators to climb up using insulated ladders. Climbing up nearly 5 meters of insulated material is dangerous, and sampling oil while it is energized poses a risk of accidents to operators. Utility Model Content

[0004] The purpose of this utility model is to provide an oil sampling valve for oil-immersed current or voltage transformers. Its structure is reasonable, which can avoid the danger of workers working at heights, avoid oil sampling while the circuit is electrified, reduce labor intensity, and improve work efficiency.

[0005] The purpose of this utility model is achieved as follows: an oil sampling valve for oil sampling from an oil-immersed current or voltage transformer includes an oil storage tank for the current or voltage transformer installed on the top of a support in a substation. The oil sampling valve is connected to the oil storage tank through an oil sampling port. The structure of the oil sampling valve is that a valve core tube is installed in the inner cavity of a cylindrical valve body through a second sealing ring and a third sealing ring. An externally threaded pipe with a baffle plate at the bottom is provided on the valve core tube located at the upper part of the valve body. The externally threaded pipe is connected to the oil outlet interface pipe of the oil sampling port. An oil outlet push rod is installed in the pipe hole of the valve core tube. The upper part of the oil outlet rod has a diameter smaller than the diameter of the valve core tube hole, forming an oil inlet chamber. An annular groove is provided in the middle of the outer wall of the valve core tube, and the annular groove is connected to the oil inlet chamber through an oil passage. The oil outlet pipe provided in the middle of the valve body is connected to the annular groove of the valve core tube. The oil outlet rod located at the lower part of the oil inlet chamber is engaged with the valve core tube hole through a fourth sealing ring. The oil outlet rod extending from the lower part of the valve body is connected to a threaded sleeve with internal and external threads through a threaded connection. The threaded sleeve is fitted with a nut cap through the external thread. A handle is provided at the lower end of the oil outlet rod that extends out of the nut cap.

[0006] The oil extraction valve of this invention is a pin-type connector with a handle threaded onto it. Rotating the handle extends the oil ejector rod, which pushes against the steel ball at the oil extraction port, allowing oil to flow down through the oil inlet chamber and oil passage into the oil extraction control box. The oil extraction valve is 360° rotatable, ensuring that it can be rotated in any direction to the desired location.

[0007] The oil extraction control box is tied to the steel pipe of the support frame.

[0008] The drain pipe is connected to the oil inlet pipe of the oil extraction control box, which is connected to the oil outlet via a main valve, allowing oil to be extracted. This invention is suitable for voltage transformers. It avoids high-level oil extraction and energized oil extraction, eliminating construction risks.

[0009] The oil sampling valve is normally open. When taking an oil sample, the sampled oil flows out from the quick oil sampling port by manually opening it.

[0010] This utility model has a reasonable structure, avoids the dangers of workers working at heights, avoids oil extraction while the circuit is electrified, reduces labor intensity, and improves work efficiency. Attached Figure Description

[0011] The present invention will now be further described with reference to the accompanying drawings. Figure 1 This is a schematic diagram of the main structure of the oil tapping valve. Figure 2 for Figure 1 A schematic diagram of the AA cross-sectional structure. Figure 3 This is a side view of the oil outlet structure. Figure 4 for Figure 3 Schematic diagram of the BB cross-section structure. Figure 5 A cross-sectional view of the structure for mounting an oil extraction valve on the oil extraction port. Figure 6 This is a schematic diagram of the connection structure of this utility model. Detailed Implementation

[0012] An oil sampling valve for sampling oil from an oil-immersed current or voltage transformer, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the oil storage tank 1 includes a current or voltage transformer mounted on the top of a support frame in a substation. An oil tap valve 7 is connected to the oil storage tank 1 via an oil tap port 2. The oil tap valve 7 has a structure in which a valve core tube 21 is installed inside a cylindrical valve body 18 via a second sealing ring 19 and a third sealing ring 20. An externally threaded pipe with a baffle plate at the bottom is installed on the valve core tube 21 located at the upper part of the valve body 18. The externally threaded pipe is connected to the oil outlet pipe 17 of the oil tap port 2. An oil outlet rod 12 is installed in the pipe hole of the valve core tube 21. The diameter of the upper half of the oil outlet rod 12 is smaller than that of the valve core tube 21. The diameter of the pipe hole forms the oil inlet chamber. An annular groove is provided in the middle of the outer wall of the valve core tube 21. The annular groove is connected to the oil inlet chamber through the oil passage 22. The oil outlet pipe 11 provided in the middle of the valve body 18 is connected to the annular groove of the valve core tube 21. The oil outlet rod 12 located at the lower part of the oil inlet chamber is engaged with the valve core tube hole through the fourth sealing ring 6. The oil outlet rod 12 extending from the lower part of the valve body 18 is connected to a threaded sleeve 5 with internal and external threads. The threaded sleeve 5 is connected to a nut cover 8 through the external thread. A handle 9 is provided at the lower end of the oil outlet rod 12 extending out of the nut cover 8. The structure of the oil outlet 2 is that a steel ball 16 controlled by a spring 15 is installed in the oil inlet passage 14 provided on the interface seat 13. The steel ball 16 is engaged with the outlet seat of the oil inlet passage 14. An oil outlet interface pipe 17 with internal threads is provided at the outer end of the outlet seat. A first sealing ring 10 is installed on the baffle through a sealing ring groove, so that the end face of the oil outlet pipe 17 of the oil outlet 2 is sealed with the baffle. An outer hexagon is provided around the baffle.

[0013] like Figure 6 As shown, the oil outlet 2 is connected to the drain pipe 3 via the oil outlet pipe 11 of the oil outlet valve 7 with a check valve. The drain pipe 3 is connected downward along the bracket to the oil inlet pipe of the oil outlet control box 4.

Claims

1. An oil extraction valve for oil extraction from an oil-immersed current or voltage transformer, comprising an oil reservoir (1) of a current or voltage transformer arranged at the top of a support in a substation, characterized in that: The oil valve (7) is connected to the oil storage tank (1) through the oil inlet (2). The structure of the oil valve (7) is that the valve core tube (21) is installed in the inner cavity of the cylindrical valve body (18) through the cooperation of the second sealing ring (19) and the third sealing ring (20). The valve core tube (21) located at the upper part of the valve body (18) is provided with an external threaded pipe with a baffle at the bottom. The external threaded pipe is connected to the oil outlet interface pipe (17) of the oil inlet (2). The oil outlet rod (12) is installed in the pipe hole of the valve core tube (21). The diameter of the upper half of the oil outlet rod (12) is smaller than the diameter of the pipe hole of the valve core tube (21) to form an oil inlet chamber. An annular groove is provided in the middle of the outer wall of the core tube (21). The annular groove is connected to the oil inlet chamber through the oil passage (22). The oil outlet pipe (11) provided in the middle of the valve body (18) is connected to the annular groove of the valve core tube (21). The oil outlet rod (12) located at the lower part of the oil inlet chamber is engaged with the valve core tube hole through the fourth sealing ring (6). The oil outlet rod (12) extending from the lower part of the valve body (18) is connected to a threaded sleeve (5) with internal and external threads. The threaded sleeve (5) is connected to a nut top cover (8) through the external thread. A handle (9) is provided at the lower end of the oil outlet rod (12) extending out of the nut top cover (8).

2. An oil extraction valve for oil extraction from an oil-immersed current or voltage transformer according to claim 1, characterized in that: The structure of the oil inlet (2) is that a steel ball (16) controlled by a spring (15) is installed in the oil inlet channel (14) set on the interface seat (13). The steel ball (16) cooperates with the outlet seat of the oil inlet channel (14). An oil outlet interface pipe (17) with internal threads is set at the outer end of the outlet seat.

3. An oil extraction valve for oil extraction from an oil-immersed current or voltage transformer according to claim 1, characterized in that: A first sealing ring (10) is installed on the baffle through a sealing ring groove, so that the end face of the oil outlet pipe (17) of the oil outlet (2) is sealed with the baffle. An outer hexagon is provided around the baffle.

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