Oil sampling mechanism and oil-immersed transformer

Abstract

The application relates to the technical field, in particular to an oil sampling mechanism and an oil-immersed transformer. The oil sampling mechanism is used for being installed in an oil tank; the oil sampling mechanism comprises a sampling pipe and a sampling valve; the sampling pipe is arranged in the oil tank; an oil outlet is arranged on the sampling pipe; the sampling valve comprises a connecting piece and a valve body; the connecting piece is connected with the side wall of the oil tank; the valve body is arranged in the connecting piece; one end of the valve body is used for extending into the oil tank and being connected with the sampling pipe. The oil sampling mechanism is connected with the sampling pipe and the oil tank through the connecting piece and the valve body; when oil sampling is needed, the operator does not need to use auxiliary tools such as a ladder to take oil samples; the operation process of the operator is simplified; the operation risk is reduced; and the safety is improved.

Description

Technical Field

[0001] This application relates to the technical field, and in particular to oil sampling mechanisms and oil-immersed transformers. Background Technology

[0002] In recent years, with strong national support and promotion, the power transmission and transformation industry has continued to develop, and the demand for power equipment has been increasing daily. Among them, transformers, as an important component of power transmission and transformation equipment, have seen rapid growth in both types and quantity.

[0003] Transformers include oil-immersed transformers. During the operation of oil-immersed transformers, at regular intervals, transformer oil samples need to be collected from three locations along the height of the transformer: the middle and the bottom, to conduct oil sample analysis and understand the actual operating condition of the transformer.

[0004] In related technologies, when oil samples need to be taken, operators use ladders or other auxiliary tools to take the samples, which is cumbersome and poses certain safety hazards. Utility Model Content

[0005] Therefore, it is necessary to provide an oil sampling mechanism and an oil-immersed transformer to address the problems of difficult operation during assembly and complex maintenance after oil leakage.

[0006] An oil sampling mechanism is used for installation in an oil tank; the oil sampling mechanism includes:

[0007] Sampling tube, the sampling tube is used to install inside the fuel tank; the sampling tube is equipped with an oil sampling port; and

[0008] The sampling valve includes a connector and a valve body; the connector is connected to the side wall of the oil tank; the valve body passes through the connector, and one end of the valve body is used to extend into the oil tank and connect to the sampling tube.

[0009] The oil sampling mechanism connects to the sampling tube and oil tank via connectors and valve body. When oil sampling is required, the operator does not need to use ladders or other auxiliary tools to take the oil sample, which simplifies the operation process, reduces operational risks, and improves safety.

[0010] Since the oil sampling mechanism and the oil tank sealing structure are connected to the outer wall of the oil tank by a connector, if oil leakage or other sealing problems occur during use, the operator can carry out maintenance from outside the oil tank, which helps to reduce the difficulty of maintenance.

[0011] In some embodiments, the connector includes:

[0012] A first body, one end of which is inserted into the side wall of the oil tank, and the other end of which is disposed outside the oil tank; a valve body is inserted into the first body; and

[0013] A sealing ring is fitted onto the other end of the first body and is used to seal against the outer wall of the oil tank.

[0014] The connector structure forms a stepped structure between the sealing convex ring and the first body. The surface of the sealing convex ring facing the oil tank abuts against the outer wall of the oil tank. The sealing effect between the sealing convex ring and the oil tank can be increased by increasing the contact area between the sealing convex ring and the outer wall of the oil tank and increasing the abutment force between the sealing convex ring and the outer wall of the oil tank, thereby improving the safety performance.

[0015] In some embodiments, the valve body is provided with a mounting groove and a first oil passage hole; the first oil passage hole can connect the mounting groove and the sampling tube.

[0016] The sampling valve also includes:

[0017] The oil outlet has a side wall that seals against the inner wall of the mounting groove; the oil outlet is provided with a second oil passage hole.

[0018] The first sealing plug is located between the oil outlet and the bottom wall of the mounting groove; and

[0019] An adjusting cap is fitted onto the oil outlet nozzle and is configured to connect the oil outlet nozzle and the valve body. When the adjusting cap is in the locked state, the first sealing plug is in the position of blocking the first oil passage hole. When the adjusting cap is in the unlocked state, the first sealing plug is in clearance fit with the bottom wall of the mounting groove, and the first oil passage hole can communicate with the second oil passage hole.

[0020] This sampling valve design facilitates operator control, allowing them to connect the sampling channel to the outside by adjusting the position of the adjusting cap, thus achieving the purpose of oil sampling. The adjusting cap gradually moves the first sealing plug away from the first oil passage, allowing the oil in the first oil passage to gradually flow into the second oil passage. This avoids directly opening the sampling channel, which could cause excessively rapid oil flow and splashing, resulting in both waste and danger. This adjusting cap design improves the safety of the oil sampling process.

[0021] In some embodiments, the oil outlet includes:

[0022] A third body, inserted into a mounting slot, the third body having a first oil passage hole extending axially therefrom; and

[0023] The connecting part is connected to one end of the third body. The diameter of the connecting part is smaller than the diameter of the mounting groove, so that an oil passage gap is formed between the connecting part and the inner wall of the mounting groove. The connecting part has a second oil passage hole, which connects the first oil passage hole and the oil passage gap.

[0024] This oil outlet nozzle allows oil to flow from the first oil passage hole through the oil passage gap and the second oil passage sub-hole 2322 into the first oil passage sub-hole, thereby enabling oil sampling.

[0025] In some embodiments, the oil outlet is provided with a receiving groove; the diameter of the receiving groove gradually increases along the direction away from the connector; a first sealing plug is disposed in the receiving groove, and a portion of the first sealing plug protrudes from the receiving groove.

[0026] The dovetail-shaped cross-section of the receiving groove helps prevent the first sealing plug from falling out of the groove and improves the stability of the connection between the first sealing plug and the oil outlet. This ensures that when the oil outlet approaches the first oil passage, the first sealing plug can block the first oil passage, preventing the position of the first sealing plug from shifting radially in the first oil passage and affecting the sealing effect. The portion of the first sealing plug protruding from the receiving groove helps ensure contact between the first sealing plug and the bottom surface of the mounting groove, maintaining a sealing effect under certain pressure.

[0027] In some embodiments, the sampling valve further includes:

[0028] The sleeve connects one end of the valve body to the sampling tube.

[0029] This sleeve structure helps improve the stability of the connection between the sampling valve and the sampling tube.

[0030] In some embodiments, a connecting cavity is provided inside the sleeve, and a first through hole and a second through hole communicating with the connecting cavity are provided at both ends of the sleeve; one end of the valve body extends into the connecting cavity through the first through hole and is sealed to the cavity wall of the connecting cavity; the end of the sampling tube away from the oil sampling port extends into the connecting cavity through the second through hole and is locked in the connecting cavity; one end of the valve body abuts against the end of the sampling tube away from the sampling.

[0031] The valve body and one end of the connecting cavity can clamp the end tube, which helps to improve the stability of the connection structure between the sampling valve and the sampling tube.

[0032] In some embodiments, a first limiting protrusion is provided at the second through hole of the sleeve;

[0033] The sampling tube includes:

[0034] The end pipe has a third oil passage hole inside. One end of the end pipe extends into the connecting cavity. One end of the end pipe has a second limiting protrusion ring. The two sides of the second limiting protrusion ring abut against the sleeve and the valve body, respectively.

[0035] The pipe body is used to be installed inside the oil tank; one end of the pipe body is inserted into the third oil passage hole and is sealed to the wall of the third oil passage hole.

[0036] The sampling tube utilizes its second limiting protrusion structure to abut against the first limiting protrusions on both sides and the valve body. The first limiting protrusion and the valve body respectively limit the axial movement of the second limiting protrusion of the end tube, which helps to improve the stability of the connection structure.

[0037] In some embodiments, the sampling valve further includes:

[0038] The first cap is placed over the end of the oil outlet that is away from the sampling tube; and

[0039] A second sealing plug is disposed between the second oil passage and the first end cap, and the first end cap is configured to block the outlet of the second oil passage when the first end cap is locked on the oil outlet.

[0040] The first end cap and the second sealing plug seal the outlet of the second oil passage when oil sampling is not required, thus preventing the outlet from being exposed to dust and contamination. The second end cap is only opened when the operator needs to take an oil sample, ensuring consistency between the sample taken and the position of the sample in the tank, thereby guaranteeing the accuracy of the oil sample test results. Simultaneously, the first end cap also helps prevent leakage when the adjusting cap becomes loose, improving safety.

[0041] An oil-immersed transformer, comprising:

[0042] fuel tank; and

[0043] As described above, the oil sampling mechanism includes a sampling tube and a sampling valve.

[0044] The sampling tube is equipped with an oil sampling port and is placed inside the oil tank.

[0045] The sampling valve includes a connector and a valve body; the connector is connected to the side wall of the oil tank;

[0046] The valve body is inserted through the connector, and one end of the valve body extends into the oil tank and is connected to the sampling tube.

[0047] When an oil sample needs to be taken, the operator simply needs to open the sampling valve to retrieve it, making the operation simple. Even if the operator wants to retrieve an oil sample from the upper or middle section, the operation can be performed at the sampling valve located at the bottom, making the operation quick and easy and improving the operator's safety. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the structure of an oil-immersed transformer provided in one embodiment of this application.

[0049] Figure 2 This is a schematic diagram of the structure of the oil sampling mechanism provided in one embodiment of this application. Figure 1 .

[0050] Figure 3 This is a schematic diagram of the structure of the oil sampling mechanism provided in one embodiment of this application. Figure 2 .

[0051] Figure 4This is a structural schematic diagram of a fastener provided in one embodiment of this application.

[0052] Figure 5 for Figure 3 A magnified view of a portion of point A in the middle.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1000 - Oil sampling mechanism;

[0055] 100 - Sampling tube; 110 - Oil inlet; 120 - Tube body; 130 - End tube; 131 - Second limiting protrusion ring; 132 - Third oil passage hole;

[0056] 200-Sampling valve; 210-Connector; 211-First body; 212-Sealing convex ring; 220-Valve body; 221-First oil passage hole; 222-Mounting groove; 223-Oil passage gap; 224-Second body; 225-Connecting convex ring; 230-Oil outlet; 231-Third body; 2311-Second oil passage hole; 2311a-First oil passage sub-hole; 232-Connecting part; 2321-Accommodation groove; 2322-Second oil passage sub-hole; 233-Second sealing ring; 240-First sealing plug; 250-Adjusting cap; 260-Sleeve; 261-Connecting cavity; 262-First through hole; 263-Second through hole; 264-First limiting convex ring; 270-First end cap; 280-Second sealing plug; 290-Second end cap; 2100-First sealing ring;

[0057] 300 - Fastener;

[0058] 2000 - Fuel tank; 2001 - First mounting hole. Detailed Implementation

[0059] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0060] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0061] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0064] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0065] See Figure 1 , Figure 1 A schematic diagram of the structure of an oil-immersed transformer provided in one embodiment of this application is shown.

[0066] like Figure 1 As shown, the oil-immersed transformer includes an oil tank 2000 and an oil sampling mechanism 1000. The oil sampling mechanism 1000 is installed in the oil tank 2000 and takes oil samples from the corresponding height within the tank. Oil-immersed transformers typically require periodic oil sampling from the upper, middle, and lower parts of the oil tank 2000. Under normal operating conditions, a bottom oil sample is usually taken from the lower part of the tank 2000. However, when abnormal results are found in the lower oil sample, it is often necessary to collect samples from the middle and upper parts for comparison to diagnose the fault.

[0067] like Figure 2 and Figure 3 As shown, Figure 2 This is a schematic diagram of the structure of the oil sampling mechanism 1000 provided in one embodiment of this application. Figure 1 , Figure 3 This is a schematic diagram of the structure of the oil sampling mechanism 1000 provided in one embodiment of this application. Figure 2 This embodiment provides an oil sampling mechanism 1000, which includes a sampling tube 100 and a sampling valve 200. The sampling tube 100 has an oil sampling port 110 and is installed inside an oil tank 2000. The sampling valve 200 is connected to the sampling tube 100 and is sealed to the side wall of the oil tank 2000. When an oil sample needs to be taken, the operator only needs to open the sampling valve 200 to retrieve the sample, making the operation simple.

[0068] More specifically, the sampling valve 200 includes a connector 210 and a valve body 220; the connector 210 is connected to the side wall of the oil tank 2000; the valve body 220 passes through the connector 210, and one end of the valve body 220 is used to extend into the oil tank 2000 and connect to the sampling tube 100. This oil sampling mechanism 1000 connects to the sampling tube 100 and the oil tank 2000 through the connector 210 and the valve body 220. When oil sampling is required, the operator does not need to use ladders or other auxiliary tools to take oil samples, simplifying the sampling process, reducing operational risks, and improving safety.

[0069] Since the oil sampling mechanism 1000 and the oil tank 2000 are sealed by the connector 210 and the outer wall of the oil tank 2000, if oil leakage or other sealing problems occur during use, the operator can carry out maintenance from outside the oil tank 2000, which helps to reduce the difficulty of maintenance.

[0070] Meanwhile, the oil sampling mechanism 1000 achieves a sealed connection between the sampling valve 200 and the oil tank 2000, which helps to prevent oil leakage and improve safety.

[0071] Since oil-immersed transformers typically require sampling at three heights—upper, middle, and lower—this embodiment may include one, two, or three oil sampling mechanisms 1000. The height of the oil sampling port 110 of each mechanism 1000 can be set as needed.

[0072] To facilitate oil sampling, one set of oil sampling mechanisms 1000 can have its sampling port 110 located in the upper part, and another set can have its sampling port 110 located in the middle part. Alternatively, one set of sampling mechanisms 1000 can have its sampling port 110 located in the lower part. The three sets of oil sampling mechanisms 1000 respectively sample the oil from the upper, middle, and lower parts. The sampling valves 200 of all three sets of oil sampling mechanisms 1000 are located near the bottom of the oil tank 2000. This allows for simple and quick operation by only needing to access the sampling valve 200 near the bottom of the oil tank 2000, while also improving operator safety.

[0073] Furthermore, the connector 210 is welded and fixed to the outer wall of the oil tank 2000 to improve the connection stability between the connector 210 and the outer wall of the oil tank 2000, which helps to avoid oil leakage and thus improves safety.

[0074] For example, the inner wall of the connector 210 is provided with internal threads, and the outer wall of the valve body 220 is provided with external threads. The connector 210 and the valve body 220 can be connected by threads to facilitate assembly and disassembly. In another embodiment, the connector 210 and the valve body 220 can also be fixedly connected by structures such as pins, rivets, and screws.

[0075] More specifically, the sampling tube 100 can be vertically installed inside the oil tank 2000.

[0076] In addition, such as Figure 4 As shown, the oil sampling mechanism 1000 also includes a fixing member 300. The sampling tube 100 can be fixed to the inner wall of the oil tank 2000 by the fixing member 300, thereby improving the stability of the oil sampling port of the sampling tube 100 within the oil tank 2000 and ensuring the accuracy of the oil sampling results. For example, the fixing member 300 can be a sheet-like structure. The fixing member 300 fixes the sampling tube 100 between the fixing member 300 and the oil tank 2000, and then the fixing member 300 and the oil tank 2000 are connected by screws or other structures, thereby fixing the sampling tube 100.

[0077] like Figure 3 and Figure 5 As shown, in some embodiments, the connector 210 includes a first body 211 and a sealing ring 212. One end of the first body 211 is inserted into the side wall of the oil tank 2000, and the other end of the first body 211 is disposed outside the oil tank 2000. The valve body 220 passes through the first body 211, and the sealing ring 212 is sleeved on the other end of the first body 211. The sealing ring 212 is used for sealing connection with the outer wall of the oil tank 2000. The connector 210 structure forms a stepped structure between the sealing ring 212 and the first body 211. The surface of the sealing ring 212 facing the oil tank 2000 abuts against the outer wall of the oil tank 2000. By increasing the contact area between the sealing ring 212 and the outer wall of the oil tank 2000 and increasing the abutment force between the sealing ring 212 and the outer wall of the oil tank 2000, the sealing effect between the sealing ring 212 and the oil tank 2000 can be increased, thereby improving safety performance.

[0078] In addition, the valve body 220 includes a second body 224 and a connecting protrusion 225. The connecting protrusion 225 is sleeved on the second body 224 and connected to the second body 224. The sampling valve 200 also includes a first sealing ring 2100. The first sealing ring 2100 is disposed between the connector 210 and the connecting protrusion 225 to ensure the sealing between the valve body 220 and the connector 210.

[0079] like Figure 3 and Figure 5 As shown, in some embodiments, the valve body 220 is provided with a mounting groove 222 and a first oil passage hole 221, which connects the mounting groove 222 and the sampling tube 100. The valve body 220 is connected to the sampling tube 100 through the first oil passage hole 221, which has a guiding function to facilitate the operator to take out the oil sample.

[0080] The sampling valve 200 also includes an oil outlet 230, a first sealing plug 240, and an adjusting cap 250. The oil outlet 230 is inserted into the mounting groove 222, and the side wall of the oil outlet 230 is sealed to the inner wall of the mounting groove 222. The oil outlet 230 is provided with a first oil passage hole 2311a. The first sealing plug 240 is disposed between the oil outlet 230 and the bottom wall of the mounting groove 222. The adjusting cap 250 is sleeved on the oil outlet 230, and the adjusting cap 250 is configured to connect the oil outlet 230 and the valve body 220. When the adjusting cap 250 is in the locked state, the first sealing plug 240 is in the position of blocking the first oil passage hole 221. When the adjusting cap 250 is in the unlocked state, the first sealing plug 240 is in clearance fit with the bottom of the mounting groove 222, and the first oil passage hole 221 can communicate with the first oil passage hole 2311a.

[0081] The sampling valve 200 is designed for easy operator control, allowing the operator to connect the oil sampling channel to the outside by adjusting the position of the adjusting cap 250 during oil sampling. The adjusting cap 250 gradually moves the first sealing plug 240 away from the first oil passage 221, allowing the oil in the first oil passage 221 to gradually flow into the first oil passage 2311a. This avoids directly opening the oil sampling channel, which could cause excessively rapid oil flow and splashing, resulting in both waste and danger. This adjusting cap 250 design improves the safety of the oil sampling process.

[0082] like Figure 3 and Figure 5 As shown, in some embodiments, the oil outlet 230 is provided with a receiving groove 2321. Along the direction of the oil outlet 230 away from the connector 210, the diameter of the receiving groove 2321 gradually increases. A first sealing plug 240 is disposed in the receiving groove 2321, and a portion of the first sealing plug 240 protrudes from the receiving groove 2321. The cross-sectional shape of the receiving groove 2321 is dovetail-shaped, which helps prevent the first sealing plug 240 from falling out of the receiving groove 2321 and improves the stability of the connection between the first sealing plug 240 and the oil outlet 230. This ensures that when the oil outlet 230 approaches the first oil passage 221, the first sealing plug 240 can block the first oil passage 221, preventing the position of the first sealing plug 240 from shifting radially in the first oil passage 221 and affecting the sealing effect. The portion of the first sealing plug 240 protruding from the receiving groove 2321 helps ensure that the first sealing plug 240 contacts the bottom surface of the mounting groove 222 and maintains the sealing effect under certain pressure.

[0083] In some embodiments, such as Figure 2 , Figure 3 and Figure 5As shown, the oil outlet 230 includes a third body 231 and a connecting portion 232. The third body 231 is inserted into the mounting groove 222 and has a first oil passage hole 2311a extending along its axial direction. The connecting portion 232 is connected to one end of the third body 231. The diameter of the connecting portion 232 is at least partially smaller than the diameter of the mounting groove 222, so that an oil passage gap 223 is formed between the connecting portion 232 and the inner wall of the mounting groove 222. The connecting portion 232 has a second oil passage sub-hole 2322, which connects the first oil passage hole 2311a and the oil passage gap 223, so that oil can flow from the first oil passage hole 221 through the oil passage gap 223 and the second oil passage sub-hole 2322 into the first oil passage hole 2311a, thereby realizing oil sampling.

[0084] For example, a second sealing ring 233 may be fitted around the outer periphery of the third body 231. When the third body 231 is inserted into the mounting groove 222, the second sealing ring 233 helps to ensure the sealing between the third body 231 and the inner wall of the mounting groove 222, and prevents oil leakage between the outer wall of the third body 231 and the mounting groove 222.

[0085] like Figure 3 and Figure 5 As shown, in some embodiments, the sampling valve 200 further includes a sleeve 260, which connects one end of the valve body 220 to the sampling tube 100, thereby improving the stability of the connection between the sampling valve 200 and the sampling tube 100.

[0086] Specifically, the valve body 220 and the sleeve 260 together fix the end of the sampling tube 100 away from the oil intake port 110. When assembling the oil sampling mechanism 1000, the operator can place the sleeve 260 on the sampling tube 100, then insert the valve body 220 into the first mounting hole 2001 outside the oil tank 2000 and connect and fix it with the sleeve 260, and then fix the valve body 220 to the outer wall of the oil tank 2000. This oil sampling mechanism 1000 does not require the operator to enter the oil tank 2000 for operation, which is convenient for assembly and simplifies the assembly process.

[0087] The valve body 220 and the sleeve 260 can be connected by threads, which is simple and easy to assemble and disassemble.

[0088] Furthermore, a connecting cavity 261 is provided inside the sleeve 260, and a first through hole 262 and a second through hole 263 communicating with the connecting cavity 261 are provided at both ends of the sleeve 260; one end of the valve body 220 extends into the connecting cavity 261 through the first through hole 262 and is sealed to the cavity wall of the connecting cavity 261; the end of the sampling tube 260 away from the oil port 110 extends into the connecting cavity 261 through the second through hole 263 and is locked in the connecting cavity 261; one end of the valve body 220 abuts against the end of the sampling tube 100 away from the sampling point. At this time, the valve body 220 and one end of the connecting cavity 261 can clamp the end tube 130, which helps to improve the stability of the connection structure between the sampling valve 200 and the sampling tube 100.

[0089] For example, the sleeve 260 has a U-shaped cap structure, and a first limiting protrusion 264 is provided at the second through hole 263 of the sleeve 260. The end tube 130 can be installed from the side of the connecting cavity 261 where the first limiting protrusion 264 is not provided, so that the sampling tube 100 partially overlaps the first limiting protrusion 264. When the valve body 220 is connected to the sleeve 260, the valve body 220 and the first limiting protrusion 264 jointly clamp the sampling tube 100.

[0090] like Figure 3 and Figure 5 As shown, in some embodiments, the sampling tube 100 includes a tube body 120 and an end tube 130. The end tube 130 has a third oil passage hole 132, one end of which extends into the connecting cavity 261. One end of the end tube 130 has a second limiting protrusion 131, the two sides of which abut against the first limiting protrusion 264 of the sleeve 260 and the valve body 220, respectively. The tube body 120 is installed inside the oil tank 200. One end of the tube body 120 is inserted into the third oil passage hole 132 and seals against the hole wall of the third oil passage hole 132. The sampling tube 100 utilizes its second limiting protrusion 131 structure to abut against the sleeve 260 and the valve body 220 on both sides. The sleeve 260 and the connector 210 respectively limit the axial movement of the second limiting protrusion 131, which helps improve the stability of the connection structure.

[0091] For example, the tube body 120 can be a metal tube to ensure the stability of the tube body 120 in the vertical direction in the oil tank 2000. This helps to ensure that the oil sampling port 110 of the tube body 120 can be stably located at a certain height, thereby improving the oil sample taken from the oil sampling port 110 to meet the requirements and thus improving the accuracy of the test results.

[0092] Optionally, the valve body 220 may be provided with external threads, and the inner wall of the connecting cavity 261 of the sleeve 260 may be provided with internal threads. The valve body 220 and the sleeve 260 are connected by threads to improve assembly and disassembly efficiency.

[0093] like Figure 3and Figure 5 As shown, in some embodiments, the sampling valve 200 further includes a first end cap 270 and a second sealing plug 280. The first end cap 270 covers the end of the oil outlet 230 opposite to the sampling tube 100, and the second sealing plug 280 is disposed between the first oil passage hole 2311a and the first end cap 270. The first end cap 270 is configured to block the outlet of the first oil passage hole 2311a when the first end cap 270 is locked on the oil outlet 230. The first end cap 270 and the second sealing plug 280 can block the outlet of the first oil passage hole 2311a when oil sampling is not required, thereby preventing the outlet of the first oil passage hole 2311a from being exposed to the outside and contaminated by dust in the environment. The second end cap 290 is opened only when the operator needs to take an oil sample, which helps to ensure the consistency between the oil sample taken out and the position of the oil sample to be taken in the tank, thereby ensuring the accuracy of the oil sample test results. At the same time, the first end cap 270 also helps to prevent some leakage when the adjusting cap 250 is loose, which helps to improve safety performance.

[0094] For example, the first end cap 270 can be threadedly connected to the oil outlet 230, which is a convenient connection method.

[0095] Optionally, the second sealing plug 280 has a T-shaped structure. The second sealing plug 280 can be inserted from the inside of the first end cap 270 into the second end cap 290, connecting the first sealing plug 240 and the first end cap 270 together, so as to facilitate assembly and disassembly.

[0096] In addition, the sampling valve 200 also includes a second end cap 290, which covers the first end cap 270 to further improve the cleanliness of the internal structure of the sampling valve 200 and to enhance safety performance. Exemplarily, the second end cap 290 is threadedly connected to the valve body 220. Threaded connections offer the advantages of simplicity and ease of operation for the operator.

[0097] Now combined Figure 2 , Figure 3 and Figure 5 The operation process of sampling valve 200 is explained.

[0098] When the operator needs to take an oil sample from the corresponding oil port 110, the second end cap 290 and the first end cap 270 can be removed in sequence, and then the position of the adjusting cap 250 can be gradually adjusted so that the oil can flow from the first oil passage hole 221 into the oil passage gap 223, the second oil passage sub-hole 2322 and the first oil passage hole 2311a in sequence, and finally flow out from the oil outlet 230.

[0099] After the oil sample is taken, the operator can assemble the sampling valve 200 by reversing the above process.

[0100] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An oil sampling mechanism for installation in an oil tank (2000); characterized in that, The oil sampling device includes: A sampling tube (100) is provided inside the oil tank (2000); the sampling tube (100) is provided with an oil sampling port (110); and The sampling valve (200) includes a connector (210) and a valve body (220); the connector (210) is connected to the side wall of the oil tank (2000); the valve body (220) passes through the connector (210), and one end of the valve body (220) is used to extend into the oil tank (2000) and connect to the sampling tube (100).

2. The oil sampling mechanism according to claim 1, characterized in that, The connector (210) includes: A first body (211), one end of which is inserted into the side wall of the oil tank (2000), and the other end of which is disposed outside the oil tank (2000); the valve body (220) passes through the first body (211); and A sealing ring (212) is sleeved on the other end of the first body (211) and is used to seal the connection with the outer wall of the oil tank (2000).

3. The oil sampling mechanism according to claim 1, characterized in that, The valve body (220) is provided with an installation groove (222) and a first oil passage hole (221); the first oil passage hole (221) can connect the installation groove (222) and the sampling tube (100); The sampling valve (200) also includes: An oil outlet (230) is inserted into the mounting groove (222); and the side wall of the oil outlet (230) is sealed to the inner wall of the mounting groove (222); the oil outlet (230) is provided with a second oil passage hole (2311). A first sealing plug (240) is disposed between the oil outlet (230) and the bottom wall of the mounting groove (222); and An adjusting cap (250) is fitted onto the oil outlet (230), and the adjusting cap (250) is configured to connect the oil outlet (230) and the valve body (220). When the adjusting cap (250) is in the locked state, the first sealing plug (240) is in the position of blocking the first oil passage (221). When the adjusting cap (250) is in the unlocked state, the first sealing plug (240) is in clearance fit with the bottom wall of the mounting groove (222), and the first oil passage (221) can communicate with the second oil passage (2311).

4. The oil sampling mechanism according to claim 3, characterized in that, The oil outlet (230) includes: A third body (231) is inserted into the mounting groove (222), and the third body (231) is provided with a first oil passage hole (2311a) extending along its axial direction; and A connecting part (232) is connected to one end of the third body (231). The diameter of the connecting part (232) is smaller than the diameter of the mounting groove (222), so that an oil passage gap (223) is formed between the connecting part (232) and the inner wall of the mounting groove (222). The connecting part (232) has a second oil passage sub-hole (2322), which connects the first oil passage sub-hole (2311a) and the oil passage gap (223).

5. The oil sampling mechanism according to claim 3, characterized in that, The oil outlet (230) is provided with a receiving groove (2321); along the direction of the oil outlet (230) away from the connector (210), the diameter of the receiving groove (2321) gradually increases; the first sealing plug (240) is disposed in the receiving groove (2321), and a portion of the first sealing plug (240) protrudes from the receiving groove (2321).

6. The oil sampling mechanism according to any one of claims 1-5, characterized in that, The sampling valve (200) also includes: A sleeve (260) is connected to one end of the valve body (220) and the sampling tube (100).

7. The oil sampling mechanism according to claim 6, characterized in that, The sleeve (260) is provided with a connecting cavity (261). The two ends of the sleeve (260) are provided with a first through hole (262) and a second through hole (263) communicating with the connecting cavity (261). One end of the valve body (220) extends into the connecting cavity (261) through the first through hole (262) and is sealed to the cavity wall of the connecting cavity (261). The end of the sampling tube (100) away from the oil port (110) extends into the connecting cavity (261) through the second through hole (263) and is locked in the connecting cavity (261). One end of the valve body (220) abuts against the end of the sampling tube (100) away from the sampling.

8. The oil sampling mechanism according to claim 7, characterized in that, A first limiting protrusion (264) is provided at the second through hole (263) of the sleeve (260); The sampling tube (100) includes: End tube (130), the end tube (130) is provided with a third oil passage hole (132), one end of the end tube (130) extends into the connecting cavity (261), one end of the end tube (130) is provided with a second limiting protrusion ring (131), the two sides of the second limiting protrusion ring (131) abut against the sleeve (260) and the valve body (220) respectively; Pipe body (120), the pipe body (120) is used to be installed in the oil tank (2000); one end of the pipe body (120) is inserted into the third oil passage hole (132) and is sealed to the wall of the third oil passage hole (132).

9. The oil sampling mechanism according to any one of claims 3-5, characterized in that, The sampling valve (200) also includes: A first end cap (270) is provided over the end of the oil outlet (230) facing away from the sampling tube (100); and A second sealing plug (280) is disposed between the second oil passage (2311) and the first end cap (270), and the first end cap (270) is configured to block the outlet of the second oil passage (2311) when the first end cap (270) is locked on the oil outlet (230).

10. An oil-immersed transformer, characterized in that, include: Fuel tank (2000); and The oil sampling mechanism according to any one of claims 1-9, the oil sampling mechanism includes a sampling tube (100) and a sampling valve (200). The sampling tube (100) is provided with an oil sampling port (110), and the sampling tube (100) is installed inside the oil tank (2000); The sampling valve (200) includes a connector (210) and a valve body (220); the connector (210) is connected to the side wall of the oil tank (2000); The valve body (220) passes through the connector (210), and one end of the valve body (220) extends into the oil tank (2000) and is connected to the sampling tube (100).

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