An oil sampling tool for oil-immersed transformers

Abstract

The utility model discloses an oil-immersed transformer oil sampling tool which belongs to the technical field of oil-immersed transformer inspection. It mainly comprises: a machine body, a plurality of liquid taking cavities embedded in the machine body are fixed on the top of the machine body, and an auxiliary mechanism is fixed between the liquid taking cavities; a transfusion tube is fixed on one side of the machine body, one end of the transfusion tube extends into the machine body, and the transfusion tube is fixedly connected with the plurality of liquid taking cavities and a waste liquid box fixed in the machine body in sequence; a liquid taking cup is embedded in the liquid taking cavity, one end of the liquid taking cup is embedded with the bottom of the liquid taking cavity, and the other end of the liquid taking cup is fixedly connected with the auxiliary mechanism. The utility model can complete the automatic sampling work of the oil-immersed transformer through a simple mechanical linkage structure, which not only simplifies the sampling steps and improves the sampling efficiency, but also ensures the safety of the operator. The utility model is mainly used for the automatic sampling work of the oil-immersed transformer oil.

Description

Technical Field

[0001] This utility model belongs to the field of oil-immersed transformer inspection technology, and more specifically, it relates to a tool for taking oil samples from oil-immersed transformers. Background Technology

[0002] In power systems, oil-immersed transformers are critical electrical equipment, and the performance of their insulating oil directly affects the safe and stable operation of the transformer. To ensure the normal operation of the transformer, it is necessary to regularly sample and test the insulating oil, and analyze various indicators (such as dielectric loss, moisture content, and breakdown voltage) to determine the operating status of the equipment.

[0003] Currently, the sampling of insulating oil in oil-immersed transformers mainly relies on manual operation. The specific procedure typically involves the operator arriving at the transformer site with a sampling bottle, connecting pipe, wrench, and other tools. First, the oil sampling nozzle is cleaned. Then, the oil is drained through the sampling pipe. Next, the sampling bottle is lubricated, the oil in the bottle is drained, and sampling is performed again. After sampling, the valves are closed, the pipeline is disassembled, and the site is cleaned. Furthermore, during the sampling process, the operator must continuously monitor the sample volume to prevent oil overflow or insufficient sampling.

[0004] This manual sampling method has several drawbacks: First, the procedure is cumbersome and requires a high level of proficiency from the staff, consuming significant manpower and time. Especially in densely populated areas like substations, multiple sampling operations can significantly reduce work efficiency. Second, inaccurate sampling amounts can affect the reliability of subsequent test results. Furthermore, transformers may operate at high temperatures or pose potential electrical safety risks, making close-range manual operation a safety hazard.

[0005] Therefore, in view of the problems of cumbersome, inefficient and unsafe manual sampling procedures for oil-immersed transformers in existing technology centers, there is an urgent need for a sampling device that can simplify sampling operations, improve sampling efficiency and ensure operational safety. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an oil sampling tool for oil-immersed transformers. Through a simple mechanical linkage structure, it can complete the automated sampling of oil-immersed transformers, which not only simplifies the sampling steps and improves the sampling efficiency, but also ensures the safety of operators.

[0007] The aforementioned oil sampling tool for an oil-immersed transformer includes a body. Multiple sampling chambers embedded within the body are fixed to the top of the body, and auxiliary mechanisms are fixed between the sampling chambers. An infusion tube is fixed to one side of the body, with one end extending into the body and sequentially connected to the multiple sampling chambers and a waste liquid box fixed within the body. A sampling cup is embedded within each sampling chamber, with one end fitting into the bottom of the chamber and the other end fixedly connected to the auxiliary mechanism.

[0008] Preferably, the liquid collection chamber includes a first chamber and a second chamber, in which a spring and a pressure plate are embedded sequentially from bottom to top, and a first through hole is provided in the middle of the pressure plate; the bottom of the first chamber and the second chamber are provided with a branch pipe and a return pipe, the branch pipe being connected to the infusion pipe and the return pipe being connected to the waste liquid box.

[0009] Preferably, one end of the branch pipe protrudes into the first chamber or the second chamber, and the other end is connected to the infusion tube, with a first electrically controlled three-way valve or a second electrically controlled three-way valve fixed at the connection.

[0010] Preferably, a flow meter is fixed between the branch pipe and the first or second electrically controlled three-way valve.

[0011] Preferably, the liquid collection cup includes a cup body, the bottom of which is provided with a second through hole adapted to the first through hole; a self-closing valve is fixed at the bottom of the cup body, located above the second through hole; a limit ring is fixed at the rim of the cup body, and a piston plate is provided between the limit ring and the self-closing valve; the squeezing ring is detachably disposed at the rim of the liquid collection chamber, and the bottom of the squeezing ring abuts against the limit ring.

[0012] Preferably, the self-closing valve includes a valve body with a through groove on its side wall; the valve body contains a sealing plug and a spring in sequence from bottom to top.

[0013] Preferably, the auxiliary mechanism includes an electric push rod, a connecting plate, a fixing knob, and a connecting column. The electric push rod is fixed to the top of the inner side of the machine body, located between the liquid collection chambers, and the movable end of the electric push rod protrudes outside the machine body. One end of the connecting plate is rotatably connected to the movable end of the electric push rod, and the other end extends above the liquid collection chamber. One end of the connecting column is detachably connected to the piston plate, and the other end abuts against the connecting plate. The fixing knob passes through the connecting plate and is detachably connected to the connecting column.

[0014] Preferably, the end of the infusion tube furthest from the second electrically controlled three-way valve is connected to a first electrically controlled valve; the first electrically controlled three-way valve is connected to the waste liquid box by a second electrically controlled valve.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. Through a simple mechanical linkage structure, it simulates the necessary operating procedures in manual sampling. While ensuring that the sampling work complies with operating specifications, it can automatically complete the oil sampling work, which not only simplifies the sampling steps and improves sampling efficiency, but also ensures the safety of operators. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the liquid-collecting chamber and liquid-collecting cup of this utility model in an unconnected state; Figure 4 This is a schematic diagram showing the connection state between the liquid collection chamber and the liquid collection cup of this utility model; Figure 5 This is a partially enlarged view of the present invention.

[0017] In the diagram, 1. Main body; 11. Control panel; 12. Battery; 2. Liquid dispensing chamber; 21. First chamber; 211. Return spring; 212. Pressure plate; 213. First through hole; 214. Branch pipe; 2141. Limiting contact; 215. Return pipe; 216. First electrically controlled three-way valve; 217. Flow meter; 22. Second chamber; 221. Second electrically controlled three-way valve; 3. Liquid dispensing cup; 31. Cup body; 32. 33. Second through hole; 33. Self-closing valve; 331. Valve body; 332. Through groove; 333. Block; 334. Sealing spring; 34. Limiting ring; 35. Piston plate; 351. Connecting groove; 36. Compression ring; 37. Reserved cavity; 4. Auxiliary mechanism; 41. Electric push rod; 42. Connecting plate; 43. Fixing knob; 44. Connecting column; 5. Infusion tube; 51. Electric control valve; 6. Waste liquid box; 61. Drain tube. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings: The directional terms used in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application based on the visual orientation shown in the accompanying drawings. Unless otherwise expressly specified and limited, the terms "setting," "installation," "connection," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] like Figure 1 and Figure 2As shown, an oil sampling tool for oil-immersed transformers includes a body 1. Multiple sampling chambers 2 are fixedly embedded in the top of the body 1, and auxiliary mechanisms 4 are fixed between the sampling chambers 2. A delivery pipe 5 is fixed to one side of the body 1, with one end extending into the body 1 and sequentially connected to the multiple sampling chambers 2 and a waste liquid box 6 fixed inside the body 1. A sampling cup 3 is embedded in each sampling chamber 2, with one end fitting into the bottom of the sampling chamber 2 and the other end fixedly connected to the auxiliary mechanism 4. Thus, when sampling transformer oil, the operator only needs to connect the transformer to the delivery pipe 5 using fittings, embed the sampling cup 3 into the sampling chamber 2, and activate the auxiliary mechanism 4 to complete the sampling. This device enables a fully automated sampling process, eliminating the need for operator supervision. Compared to traditional manual sampling, it not only reduces operational complexity and improves work efficiency but also enhances operator safety.

[0020] Optionally, the body 1 also has an operation panel 11 embedded inside, and a battery 12 fixed to the body 1 is provided below it.

[0021] Optionally, one end of the waste liquid box 6 is provided with a drain pipe 61 that communicates with the outer wall of the body 1.

[0022] like Figures 2 to 4 As shown, the liquid sampling chamber 2 includes a first chamber 211 and a second chamber 22. Inside each chamber, from bottom to top, are a return spring 211 and a pressure plate 212, with a first through hole 213 in the center of the pressure plate 212. Both the first chamber 211 and the second chamber 22 have branch pipes 214 and return pipes 215 at their bottoms. The branch pipes 214 are connected to the infusion pipe 5, and the return pipes 215 are connected to the waste liquid box 6. Thus, the branch pipes 214 can connect to the sampling cup 3 embedded in the first chamber 211 or the second chamber 22, allowing the oil to smoothly enter the sampling cup 3 for oil sample collection and storage. Simultaneously, the pressure plate 212 also acts as a barrier against foreign objects, preventing damage to the branch pipes 214 should foreign objects accidentally fall into the first chamber 211 or the second chamber 22.

[0023] Understandably, when the equipment performs its first oil sampling, a lubrication operation is required. This involves releasing a portion of the oil to lubricate components such as the infusion tube 5 and the sampling cup 3, thereby reducing the impact of tube wall friction on oil flow during subsequent sampling. Simultaneously, the lubrication operation also cleans the tube and cup walls, reducing interference from impurities adhering to the tube walls on the test results. However, the oil released during lubrication cannot be collected as sampling oil. Therefore, during lubrication, the oil enters the branch pipe 214 through the infusion tube 5, overflows from the end of the branch pipe 214, and flows into the waste liquid box 6 through the return pipe 215. After lubrication, a liquid collection cup 3 is inserted into the first chamber 211 and / or the second chamber 22 and fixed in place. During this fixing process, the liquid collection cup 3 abuts against the pressure plate 212, pressing the pressure plate 212 towards the bottom of the first chamber 211 and / or the second chamber 22. This causes the end of the branch pipe 214 to engage with the first through hole 213 of the pressure plate 212 and pass through the first through hole 213 into the liquid collection cup 3. At this point, in conjunction with the auxiliary mechanism 4, oil enters the liquid collection cup 3 to lubricate its walls. After lubrication, with the cooperation of the liquid collection cup 3 and the auxiliary mechanism 4, waste liquid is transported through the branch pipe 214 and the infusion pipe 5 to the waste liquid box 6.

[0024] like Figure 2 As shown, one end of the branch pipe 214 protrudes into the first chamber 211 or the second chamber 22, and the other end is connected to the infusion pipe 5. A first electrically controlled three-way valve 216 or a second electrically controlled three-way valve 221 is fixed at the connection point. Thus, the first electrically controlled three-way valve 216 is connected to the branch pipe 214 in the first chamber 211, and the second electrically controlled three-way valve 221 is connected to the branch pipe 214 in the second chamber 22. The flow direction of the oil can be controlled through the first electrically controlled three-way valve 216 and the second electrically controlled three-way valve 221.

[0025] Understandably, if it is necessary to direct the oil to the first chamber 211, the second electrically controlled three-way valve 221 closes the branch pipe 214 and opens the infusion pipe 5 to flow into the outflow direction; the first electrically controlled three-way valve 216 closes the outflow direction of the infusion pipe 5 and opens the inflow direction to the branch pipe 214. When it is necessary to direct the oil to the second chamber 22, the second electrically controlled three-way valve 221 closes the outflow direction of the infusion pipe 5 and opens the inflow direction to the branch pipe 214. When waste liquid needs to be discharged, both the first electrically controlled three-way valve 216 and the second electrically controlled three-way valve 221 close the branch pipe 214 and open the flow to the outflow direction.

[0026] Optionally, a limiting contact 2141 is fixed on the outer wall of the branch pipe 214 embedded in the first chamber 211 or the second chamber 22. In this way, the limiting contact 2141 can limit the pressure plate 212, preventing the pressure plate 212 and the liquid cup 3 from being pressed down excessively, so that the liquid cup 3 can always be at a stable liquid collection height.

[0027] Optionally, the top of the branch pipe 214 is provided with a protrusion. In this way, the protrusion can prevent the top of the branch pipe 214 from being flush with the cup body 31, which would affect the flow of oil.

[0028] Optionally, the bottom of both the first chamber 211 and the second chamber 22 is provided with an inclined surface that slopes toward the return pipe 215.

[0029] like Figures 2 to 4 As shown, a flow meter 217 is fixed between the branch pipe 214 and the first electrically controlled three-way valve 216 or the second electrically controlled three-way valve 221. In this way, the flow meter 217 can accurately control the amount of oil obtained in the liquid collection cup 3, avoiding insufficient liquid collection.

[0030] like Figure 3 and Figure 4 As shown, the liquid collection cup 3 includes a cup body 31, with a second through hole 32 at its bottom that matches the first through hole 213; a self-closing valve 33 is fixed at the bottom of the cup body 31, located above the second through hole 32; a limiting ring 34 is fixed at the rim of the cup body 31, and a piston plate 35 is provided between the limiting ring 34 and the self-closing valve 33; a squeezing ring 36 is detachably disposed at the rim of the liquid collection chamber 2, and the bottom of the squeezing ring 36 abuts against the limiting ring 34. In this way, the squeezing ring 36 is detachably connected to the rim of the liquid collection chamber 2 by threads. When the cup body 31 is placed into the first chamber 211 or the second chamber 22, as the squeezing ring 36 is tightened with the liquid collection chamber 2, it can push the cup body 31 to move synchronously toward the branch pipe 214 until the bottom of the pressure plate 212 abuts against the limiting protrusion 2141. Restricted by the limiting protrusion 2141, the cup body 31 cannot move down. At this time, the second through hole 32 at the bottom of the cup body 31 is aligned with the first through hole 213, and the end of the branch pipe 214 protrudes through the first through hole 213 and the second through hole 32 into the self-closing valve 33, forcing the self-closing valve 33 to open, so that the branch pipe 214 communicates with the liquid dispensing cup 3. In addition, the limiting ring 34 provided at the rim of the cup body 31 can limit the piston plate 35, preventing the piston plate 35 from excessively displacing and detaching from the cup body 31.

[0031] Optionally, a reserved cavity 37 is defined between the piston plate 35 and the bottom of the cup body 31, and the reserved cavity 37 is filled with nitrogen. In this way, by filling the reserved cavity 37 with nitrogen, the air entering the cup body 31 can be diluted, so as to reduce the impact of air on the oxidation reaction of the oil.

[0032] Optionally, the piston plate 35 is provided with a connecting groove 351 at the top for connecting the auxiliary mechanism 4.

[0033] like Figure 5 As shown, the self-closing valve 33 includes a valve body 331, whose side wall is provided with a through groove 332; a sealing plug 333 and a closing spring 334 are sequentially embedded in the valve body 331 from bottom to top. Thus, in its natural state, the sealing plug 333 is always fixed at the edge of the second through hole 32 and the through groove 332 under the elastic action of the closing spring 334, thereby achieving the purpose of sealing the second through hole 32 and the through groove 332. When the branch pipe 214 enters the second through hole 32, the protrusion at the top of the branch pipe 214 contacts the sealing plug 333 and pushes the sealing plug 333 upward, causing the sealing plug 333 to disengage from the edge of the second through hole 32 and the through groove 332. At this time, the branch pipe 214 communicates with the reserved cavity 37.

[0034] like Figure 2 As shown, the auxiliary mechanism 4 includes an electric push rod 41, a connecting plate 42, a fixing knob 43, and a connecting column 44. The electric push rod 41 is fixed to the top of the inner side of the machine body 1, located between the liquid sampling chambers 2, and the movable end of the electric push rod 41 protrudes outside the machine body 1. One end of the connecting plate 42 is rotatably connected to the movable end of the electric push rod 41, and the other end extends above the liquid sampling chamber 2. One end of the connecting column 44 is detachably connected to the piston plate 35, and the other end abuts against the connecting plate 42. The fixing knob 43 passes through the connecting plate 42 and is detachably connected to the connecting column 44. In this way, the electric push rod 41 is connected to the connecting column 44 through the connecting plate 42, so that the connecting column 44 can drive the piston plate 35 to move synchronously with the movable end of the electric push rod 41. During the sampling process, sometimes the pressure of the transformer oil itself is low, which means that during the liquid sampling process, its own pressure is insufficient to push the piston plate 35 to move. Therefore, to avoid this situation, an auxiliary mechanism 4 is actively set to lift the piston plate 35 at a uniform speed each time liquid is drawn, ensuring that the oil can be drawn smoothly even when the oil pressure is low. In addition, during the lubrication stage, the auxiliary mechanism 4 can drive the piston plate 35 down to discharge the oil in the liquid collection cup 3 into the waste liquid box 6.

[0035] like Figure 2 As shown, the end of the infusion tube 5 away from the second electrically controlled three-way valve 221 is connected to an electrically controlled valve 51.

[0036] Specific implementation steps (taking liquid extraction from the first chamber as an example): 1. Wipe the transformer's liquid intake pipe interface and infusion pipe structure with lint-free paper, and connect them with fittings; 2. Place the liquid collection cup into the first chamber and secure it with the squeeze ring; 3. Securely connect the connecting column on the auxiliary mechanism to the piston plate; 4. Use the control panel to set the sampling parameters and open the transformer liquid sampling pipe valve; 5. Perform lubrication (automatically performed using a preset program, with the first chamber prioritized by default): • The electrically controlled valve opens; • The second electrically controlled three-way valve is closed in the branch pipe direction and open in the inflow direction to the outflow direction; • The first electrically controlled three-way valve opens when flowing into the branch pipe and closes when flowing out. • The oil enters the liquid collection cup through the infusion pipe, the second electrically controlled three-way valve, the first electrically controlled three-way valve, and the branch pipe; • The liquid collection cup is full of oil, and the auxiliary mechanism cannot continue to work; • The electric control valve is closed, the first electric control three-way valve is closed in the inflow direction, the branch pipe is opened in the outflow direction, and the auxiliary mechanism squeezes the piston plate to discharge the oil in the liquid cup into the waste liquid box; 6. Perform liquid collection (liquid collection will begin automatically after the tubing lubrication process is completed): • The electrically controlled valve is open; the first electrically controlled three-way valve is open in the direction of inflow to the branch pipe and closed in the direction of outflow. • The oil enters the liquid collection cup and continues until the auxiliary mechanism can no longer work. At this point, the first chamber has completed the liquid collection process. 7. Remove the connecting column and the squeezing ring in sequence, take out the liquid collection cup to complete the liquid collection, and seal the second through hole of the liquid collection cup with a rubber sleeve or other sealing material; 8. Repeat steps 2 to 7 to continue the liquid extraction work in the first chamber, or perform the liquid extraction work in the second chamber, and install the connecting column; or end the liquid extraction work; 9. To perform liquid extraction from the second chamber, the connecting plate of the auxiliary mechanism should be rotated to the top of the second chamber, and steps 2 to 8 should be repeated. The difference between liquid extraction from the second chamber and liquid extraction from the first chamber is the closing / closing sequence of the valves; the other steps are the same.

[0037] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tool for taking oil samples from an oil-immersed transformer, comprising a body (1), characterized in that: The top of the body (1) is fixed with multiple liquid collection chambers (2) embedded inside the body (1), and auxiliary mechanisms (4) are fixed between the liquid collection chambers (2); an infusion tube (5) is fixed on one side of the body (1), one end of which extends into the body (1) and is fixedly connected to multiple liquid collection chambers (2) and a waste liquid box (6) fixed inside the body (1) in sequence; a liquid collection cup (3) is embedded in the liquid collection chamber (2), one end of which is fitted into the bottom of the liquid collection chamber (2), and the other end is fixedly connected to the auxiliary mechanism (4).

2. The oil sampling tool for an oil-immersed transformer according to claim 1, characterized in that: The liquid collection chamber (2) includes a first chamber (21) and a second chamber (22). Inside the chamber, a reset spring (211) and a pressure plate (212) are embedded from bottom to top. The pressure plate (212) has a first through hole (213) in the middle. The bottom of the first chamber (21) and the second chamber (22) are provided with a branch pipe (214) and a return pipe (215). The branch pipe (214) is connected to the infusion pipe (5), and the return pipe (215) is connected to the waste liquid box (6).

3. The oil sampling tool for an oil-immersed transformer according to claim 2, characterized in that: One end of the branch pipe (214) protrudes into the first chamber (21) or the second chamber (22), and the other end is connected to the infusion tube (5), and a first electrically controlled three-way valve (216) or a second electrically controlled three-way valve (221) is fixed at the connection.

4. The oil sampling tool for an oil-immersed transformer according to claim 3, characterized in that: A flow meter (217) is fixed between the branch pipe (214) and the first electrically controlled three-way valve (216) or the second electrically controlled three-way valve (221).

5. The oil sampling tool for an oil-immersed transformer according to claim 1, characterized in that: The liquid collection cup (3) includes a cup body (31), the bottom of which is provided with a second through hole (32) adapted to the first through hole (213); a self-closing valve (33) is fixed at the bottom of the cup body (31), located above the second through hole (32); a limit ring (34) is fixed at the rim of the cup body (31), and a piston plate (35) is provided between the limit ring (34) and the self-closing valve (33); a squeezing ring (36) is provided at the top of the limit ring (34), and the squeezing ring (36) is detachably set at the rim of the liquid collection chamber (2), and its bottom abuts against the limit ring (34).

6. The oil sampling tool for an oil-immersed transformer according to claim 5, characterized in that: The self-closing valve (33) includes a valve body (331) with a through groove (332) on its side wall; the valve body (331) is fitted with a sealing plug (333) and a closing spring (334) from bottom to top.

7. The oil sampling tool for an oil-immersed transformer according to claim 1, characterized in that: The auxiliary mechanism (4) includes an electric push rod (41), a connecting plate (42), a fixing knob (43), and a connecting column (44). The electric push rod (41) is fixed on the top of the inner side of the machine body (1) and located between the liquid collection chambers (2), with the movable end of the electric push rod (41) protruding outside the machine body (1). One end of the connecting plate (42) is rotatably connected to the movable end of the electric push rod (41), and the other end extends above the liquid collection chamber (2). One end of the connecting column (44) is detachably connected to the piston plate (35), and the other end abuts against the connecting plate (42). The fixing knob (43) passes through the connecting plate (42) and is detachably connected to the connecting column (44).

8. The oil sampling tool for an oil-immersed transformer according to claim 1, characterized in that: The end of the infusion tube (5) away from the second electrically controlled three-way valve (221) is connected to an electrically controlled valve (51).

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