A transformer oil sampler

Abstract

This invention relates to the field of power equipment operation and maintenance, and discloses a transformer oil sampler, including a contact ring. A connecting post is fixedly connected to the outer side of the contact ring, and a transition sleeve is fixedly connected to the outer side of the connecting post. A locking cylinder is rotatably connected to the outer side of the transition sleeve, and a guide sleeve is fixedly connected to the outer side of the locking cylinder. An oil outlet pipe is slidably connected inside the guide sleeve. A sealing ring is provided inside the transition sleeve. A hexagonal inner opening is slidably connected inside the locking cylinder. A first spring is provided inside the locking cylinder, and a second spring is sleeved outside the oil outlet pipe. A sampling port oil outlet bolt valve is slidably connected inside the hexagonal inner opening. This invention, by employing a hexagonal inner opening snap-fit ​​connection combined with a multi-stage sealing structure, allows for quick connection to the sampling valve, enabling single-person operation, preventing leakage and air intake, and improving sampling efficiency and oil sample collection quality.

Description

Technical Field

[0001] This invention relates to the field of power equipment operation and maintenance, specifically to a transformer oil sampler. Background Technology

[0002] During the operation and maintenance of power equipment, sampling of transformer insulating oil is a routine procedure for equipment condition monitoring. The collected oil samples are sent to the laboratory for chromatographic and insulation performance tests. The test results serve as the basis for judging internal faults in the transformer. Most large-capacity transformers have three sampling points at different heights. The sampling point at the bottom of the equipment has limited space. Domestic substation operation and maintenance work generally requires the sampling of multiple transformers to be completed in a short period of time. The sampling equipment used on site needs to be adapted to the confined space conditions and meet the sealing requirements of oil sample collection.

[0003] Currently, mainstream sampling devices use a threaded connection structure to match the sampling port of the transformer. In the confined space, the threaded connection requires multiple adjustments of the tool position to complete the thread engagement. A single person cannot quickly complete the sampling port docking operation. The assembly gap generated by the threaded assembly cannot compensate for the changes in the external dimensions caused by the corrosion of the sampling port surface. Oil seepage will occur at the gap, and outside air will mix into the oil sample through the gap, causing deviations in the oil sample test indicators. The excessive time required for threaded assembly cannot meet the work requirements of centralized sampling of large batches of transformers.

[0004] Therefore, this invention proposes a transformer oil sampler to address the shortcomings of existing technologies. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a transformer oil sampler that solves the problems of time-consuming docking, sealing defects, difficulty in single-person sampling in confined working environments, and oil leakage and air ingress associated with traditional threaded connection samplers.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a transformer oil sampler, comprising a contact ring, a connecting post fixedly connected to the outer side of the contact ring, a transition sleeve fixedly connected to the outer side of the connecting post, a locking cylinder rotatably connected to the outer side of the transition sleeve, a guide sleeve fixedly connected to the outer side of the locking cylinder, an oil outlet pipe slidably connected inside the guide sleeve, a sealing ring provided inside the transition sleeve, a hexagonal inner opening slidably connected inside the locking cylinder, a first spring provided inside the locking cylinder, and a second spring sleeved outside the oil outlet pipe.

[0007] Preferably, the sampling port oil outlet bolt valve is slidably connected inside the hexagonal inner opening, and a sampling port protective cap fastening threaded component is fixedly connected to the outside of the sampling port oil outlet bolt valve.

[0008] Preferably, the transition sleeve has a hollow cylindrical structure, and the outer wall of the larger diameter section of the transition sleeve is rotatably fitted with the outer wall of the locking cylinder.

[0009] Preferably, the first spring abuts against the outside of the hexagonal inner opening, and the sampling port protective cap fastening thread is rotatably connected inside the contact ring.

[0010] Preferably, an external valve is provided at the top of the oil outlet pipe, and a smooth inclined surface is provided inside the guide sleeve.

[0011] Preferably, the inner side of the contact ring is provided with a thread diameter, which is adapted to the shape of the fastening thread of the sampling port protective cap.

[0012] Preferably, one end of the second spring abuts against the inner wall of the guide sleeve, and the other end of the second spring abuts against the inner wall of the locking cylinder.

[0013] Preferably, the guide sleeve has a guide through hole in the middle, and the guide through hole is slidably connected to the oil outlet pipe.

[0014] This invention provides a transformer oil sampler, which has the following beneficial effects: 1. This invention relies on a combination structure of a contact ring, a locking cylinder, a hexagonal inner opening, and a first spring, abandoning the traditional threaded connection method. Operators only need to rotate the locking cylinder to lock the valve body, which is suitable for the narrow working environment at the bottom of the transformer. A single person can complete the connection of the sampling port without the need for additional fixing tools, which greatly shortens the on-site connection time and effectively improves the efficiency of centralized sampling of multiple transformers.

[0015] 2. This invention relies on the inner sealing ring of the transition sleeve, the smooth inclined surface of the guide sleeve, and the second spring working together to form a multi-layer sealing structure with a contact ring made of 316L stainless steel. This structure can fill the gaps caused by corrosion and dimensional deviations at the sampling port, prevent oil leakage and air from mixing into the oil, avoid interference from air bubbles and impurities, and ensure that the oil sample submitted for testing can meet the sampling standards for insulation and chromatographic tests.

[0016] 3. This invention uses a hollow cylindrical transition sleeve to connect the oil outlet pipe, and together with the external valve installed at the pipe end, a continuous oil flow channel is formed. All structures are coaxially arranged to eliminate dead zones for oil accumulation. Maintenance personnel can flexibly control the oil flow rate through the external valve and quickly close the valve after sampling to reduce the waste of oil dripping during the sampling process and reduce the probability of on-site oil pollution. Attached Figure Description

[0017] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the hexagonal inner opening of the present invention; Figure 3 This is a schematic diagram of the fastening thread of the sampling port protective cap of the present invention.

[0018] Among them, 1. Contact ring; 2. Connecting column; 3. Transition sleeve; 4. Locking cylinder; 5. Guide sleeve; 6. Oil outlet pipe; 7. External valve; 8. Sealing ring; 9. Hexagonal inner opening; 10. First spring; 11. Second spring; 12. Smooth inclined surface; 13. Sampling port protective cap fastening threaded part; 14. Sampling port oil outlet bolt valve. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see the appendix Figure 1 - Appendix Figure 3 This invention provides a transformer oil sampler, including a contact ring 1 made of 316L stainless steel. The contact ring 1, when fitted with the threaded fastener 13 of the sampling port protective cap, achieves initial end-face sealing during the sampling process. The inner side of the contact ring 1 has a threaded diameter that matches the threaded structure of the sampling port, assisting the contact ring 1 in completing the initial sealing operation at the sampling front. The threaded diameter is compatible with the shape of the threaded fastener 13 of the sampling port protective cap, and their matching dimensions facilitate screwing and docking to fix the contact ring 1 outside the sampling port. A connecting post 2 is fixedly connected to the outer side of the contact ring 1, which positions and fixes the contact ring 1, distributing the force generated during the sampling process and preventing displacement.

[0021] A transition sleeve 3 is fixedly connected to the outer side of the connecting column 2. The transition sleeve 3 enables the transition connection between the contact ring 1 and the locking cylinder 4, compensating for installation errors caused during assembly. The transition sleeve 3 has a hollow cylindrical structure, and the hollow cavity can form a continuous oil passage, ensuring the smooth delivery of transformer oil from the front end to the rear end pipeline. The outer side of the transition sleeve 3 is rotatably connected to the locking cylinder 4. This rotatable connection allows the locking cylinder 4 to rotate, thus completing subsequent clamping and disassembly actions. The outer wall of the larger diameter section of the transition sleeve 3 rotates and engages with the outer wall of the locking cylinder 4. The larger diameter outer wall acts as a limiting constraint, regulating the rotation path of the locking cylinder 4 and preventing misalignment during rotation.

[0022] A guide sleeve 5 is fixedly connected to the outer side of the locking cylinder 4. This integrated fixing structure provides an installation base for guiding the oil outlet end and axially clamping and sealing. A guide through-hole is provided in the middle of the guide sleeve 5. This guide through-hole, in conjunction with the smooth inclined surface 12 inside the sleeve, guides the oil outlet end to move along the slope towards the inside of the pipeline. The guide through-hole is slidably connected to the oil outlet pipe 6, ensuring smooth entry of the oil outlet end into the oil outlet pipe 6. The oil outlet pipe 6 is slidably connected inside the guide sleeve 5. This slidable connection adapts to the feed guidance action of the oil outlet end, allowing the oil outlet end to smoothly enter the oil outlet pipe 6. An external valve 7 is installed at the top of the oil outlet pipe 6. This external valve 7 controls the oil circuit flow, allowing for the start and stop of sampling operations and regulation of the transformer oil flow rate.

[0023] The transition sleeve 3 is equipped with a sealing ring 8 inside. The sealing ring 8 can fill the gaps in the component assembly, seal the splicing gaps, and prevent oil leakage. The locking cylinder 4 has a hexagonal inner port 9 inside that slides. The sliding installation form is adapted to the axial movement of the hexagonal inner port 9, which facilitates docking and separation with the sampling port oil outlet bolt valve 14.

[0024] The sampling port oil outlet bolt valve 14 is slidably connected inside the hexagonal inner port 9. The sampler and the sampling valve can be quickly locked by the mutual engagement and fixation of the hexagonal inner port 9 and the sampling port oil outlet bolt valve 14. The sampling port protective cap fastening threaded part 13 is fixedly connected to the outside of the sampling port oil outlet bolt valve 14. The sampling port protective cap fastening threaded part 13 can be matched and engaged with the internal thread of the contact ring 1, which helps the contact ring 1 to achieve the sealing of the sampling port end face.

[0025] The sampling port protective cap fastening threaded part 13 is rotatably connected inside the contact ring 1. The rotatable fit makes it easy for the operator to tighten the contact ring 1 and quickly complete the pre-installation alignment and sealing of the sampling front end. The locking cylinder 4 is equipped with a first spring 10, which can output axial preload force to provide a continuous pressing force for the hexagonal inner port 9 to clamp the valve.

[0026] The first spring 10 abuts against the outside of the hexagonal inner opening 9. This abutment allows the spring force to be directly transmitted to the hexagonal inner opening 9, stabilizing the connection after clamping. A second spring 11 is sleeved on the outside of the oil outlet pipe 6. The second spring 11, in conjunction with the guide sleeve 5, axially clamps the oil outlet end of the sampling port, further enhancing the sealing performance at the pipe connection. One end of the second spring 11 abuts against the inner wall of the guide sleeve 5. This fixed connection prevents radial displacement of the second spring 11 during operation. The other end of the second spring 11 abuts against the inner wall of the locking cylinder 4. This fixed connection ensures the stable position of the second spring 11, allowing it to continuously output axial clamping force. The guide sleeve 5 has a smooth inclined surface 12 inside, which facilitates rapid introduction of the oil outlet end of the sampling port and achieves axial clamping and sealing.

[0027] Working principle: The contact ring 1 is made of 316L stainless steel with threads on the inside, which can fit tightly with the threads of the transformer sampling port. For sampling points at the lower end of the transformer or in narrow spaces, the operator holds the sampler, aligns the contact ring 1 with the thread on the end face of the sampling port, and tightens it. Then, the operator gently presses the sampler to make the hexagonal inner port 9 initially connect with the oil outlet bolt valve 14 of the sampling port. The connecting column 2 can be used as a connecting part between the contact ring 1 and the transition sleeve 3 to achieve the positioning and fixation of the contact ring 1 and distribute the force. The transition sleeve 3 plays a transitional connection role. Rotating the locking cylinder 4 makes the hexagonal inner port 9 lock into place. At the same time, the sealing ring 8 can fill the end face gap, seal the gap, and prevent transformer oil from leaking out. Under the axial preload of the first spring 10, the sampler and the sampling port are quickly fixed.

[0028] The oil outlet end of the sampler is automatically guided along the smooth inclined surface 12 of the guide sleeve 5 and smoothly introduced into the oil outlet pipe 6. The second spring 11 axially clamps the oil outlet end, and the external valve 7 is slowly opened. The transformer oil flows smoothly out through the sampling port and the oil outlet pipe 6 and enters the sampling container. After sampling is completed, the external valve 7 is closed, and the locking cylinder 4 is rotated in the opposite direction to release the jamming between the hexagonal inner port 9 and the sampling port. The sampler can then be removed to complete the sampling operation.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transformer oil sampler, comprising a contact ring (1), characterized in that, A connecting post (2) is fixedly connected to the outer side of the contact ring (1), a transition sleeve (3) is fixedly connected to the outer side of the connecting post (2), a locking cylinder (4) is rotatably connected to the outer side of the transition sleeve (3), a guide sleeve (5) is fixedly connected to the outer side of the locking cylinder (4), an oil outlet pipe (6) is slidably connected inside the guide sleeve (5), a sealing ring (8) is provided inside the transition sleeve (3), a hexagonal inner opening (9) is slidably connected inside the locking cylinder (4), a first spring (10) is provided inside the locking cylinder (4), and a second spring (11) is sleeved on the outside of the oil outlet pipe (6).

2. The transformer oil sampler according to claim 1, characterized in that, The sampling port oil outlet bolt valve (14) is slidably connected inside the hexagonal inner opening (9), and the sampling port protective cap fastening threaded part (13) is fixedly connected to the outside of the sampling port oil outlet bolt valve (14).

3. The transformer oil sampler according to claim 1, characterized in that, The transition sleeve (3) has a hollow cylindrical structure, and the outer wall of the larger diameter section of the transition sleeve (3) is rotatably engaged with the outer wall of the locking cylinder (4).

4. The transformer oil sampler according to claim 1, characterized in that, The first spring (10) abuts against the outside of the hexagonal inner opening (9), and the sampling port protective cap fastening threaded part (13) is rotatably connected inside the contact ring (1).

5. The transformer oil sampler according to claim 1, characterized in that, An external valve (7) is provided at the top of the oil outlet pipe (6), and a smooth inclined surface (12) is provided inside the guide sleeve (5).

6. The transformer oil sampler according to claim 1, characterized in that, The inner side of the contact ring (1) is provided with a thread diameter, which is adapted to the shape of the sampling port protective cap fastening threaded part (13).

7. The transformer oil sampler according to claim 1, characterized in that, One end of the second spring (11) abuts against the inner wall of the guide sleeve (5), and the other end of the second spring (11) abuts against the inner wall of the locking cylinder (4).

8. The transformer oil sampler according to claim 1, characterized in that, The guide sleeve (5) has a guide through hole in the middle, and the guide through hole is slidably connected to the oil outlet pipe (6).

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