Sampling device for transformer oil detection

Abstract

The utility model discloses a sampling device for transformer oil detection, which comprises a sampling barrel, an inner cavity of the sampling barrel is provided with an extension barrel, the extension barrel penetrates through the sampling barrel and extends to the lower part of the sampling barrel, and one end, located in the inner cavity of the sampling barrel, of the extension barrel is provided with an annular limiting plate; an annular boss used for limiting the position of the annular limiting plate is arranged at the cavity bottom of the sampling barrel, the annular limiting plate is tightly attached to the end face of the annular boss, a threaded ring is arranged at the end, located below the sampling barrel, of the extension barrel, and the threaded ring is installed on the outer wall of the extension barrel in a threaded mode and tightly attached to the lower end face of the sampling barrel. According to the sampling device, the length of the sampling barrel can be increased, transformer oil at different liquid levels can be sampled by changing the depth of the extension barrel inserted into the transformer oil tank, the situation that the transformer oil at different liquid levels can be sampled only by adopting injectors of various models is avoided, the structure is simple, operation is convenient, and the sampling device is suitable for popularization and application. And the accuracy of a transformer oil detection result is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of transformer testing equipment, specifically to a sampling device for transformer oil testing. Background Technology

[0002] Transformer oil is a fractionation product of petroleum, mainly composed of alkanes, cycloalkanes, and other saturated hydrocarbons. It has multiple functions, including insulation, heat dissipation, and arc suppression, and is an indispensable insulating and cooling medium in power transformers. Transformer oil testing is a key step in evaluating the quality of the insulating and cooling medium in power transformers. By testing multiple items such as appearance, physical properties, chemical properties, and electrical properties, the quality and performance of transformer oil are evaluated to determine whether they meet the requirements for safe operation of the equipment, ensuring stable operation of the transformer and extending its service life.

[0003] However, when testing transformer oil, sampling is usually performed. Current methods for sampling transformer oil mostly involve extending a syringe into the transformer to extract the oil. However, existing syringes are of fixed length and cannot be adjusted. This cumbersome process requires changing the syringe model to sample transformer oil at different levels. Therefore, those skilled in the art have provided a sampling device for transformer oil testing to solve the problems mentioned in the background section. Utility Model Content

[0004] The purpose of this invention is to provide a sampling device for transformer oil testing, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A sampling device for transformer oil testing includes: a sampling cylinder, an extension cylinder provided in the inner cavity of the sampling cylinder, the extension cylinder passing through the sampling cylinder and extending to its lower part, and an annular limiting plate provided at one end of the extension cylinder located in the inner cavity of the sampling cylinder, an annular boss provided at the bottom of the sampling cylinder for limiting the position of the annular limiting plate, the annular limiting plate being tightly attached to the end face of the annular boss, a threaded ring provided at one end of the extension cylinder located below the sampling cylinder, the threaded ring being threadedly installed on the outer wall of the extension cylinder and tightly attached to the lower end face of the sampling cylinder, and a piston for drawing transformer oil provided inside the extension cylinder, a pull rod provided at the end face of the piston for driving its displacement, and an extension rod slidably provided inside the pull rod, one end of the extension rod passing through the pull rod, the extension cylinder, and the sampling cylinder and extending to the upper part of the sampling cylinder, and an end plate provided at the end of the extension rod located above the pull rod for driving its displacement, the end plate being attached to the upper end face of the sampling cylinder and covering the opening of its inner cavity.

[0007] Preferably, a first through hole is provided at the middle position of the annular boss, the extension cylinder extends through the first through hole to the bottom of the sampling cylinder, and the end face area of ​​the annular limiting plate is larger than the opening area of ​​the first through hole.

[0008] Preferably, a rubber pad is provided around the lower end face of the annular limiting plate and surrounding the outside of the extension cylinder, and the annular limiting plate is attached to the end face of the annular boss through the rubber pad.

[0009] Preferably, a second through hole communicating with the inner cavity of the extension cylinder is provided at the middle position of the extension cylinder, and the pull rod and the extension rod extend through the second through hole to the top of the extension cylinder.

[0010] Preferably, the end face area of ​​the piston is larger than the opening area of ​​the second through hole.

[0011] Preferably, the pull rod has a groove inside, and the extension rod is slidably installed inside the groove.

[0012] Preferably, the lower end face of the end plate is provided with a rubber seat for defining its position around the outside of the extension rod, and the rubber seat is inserted into the inner cavity of the sampling tube and closely attached to its cavity wall.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] By setting up a sampling cylinder and an extension cylinder, when sampling transformer oil, the extension cylinder can be pulled from below the sampling cylinder to extend it beyond the sampling cylinder. The annular limiting plate on the extension cylinder is then tightly pressed against the end face of the annular boss. The threaded ring is then tightened to press against the lower end face of the sampling cylinder, clamping the annular boss between the threaded ring and the annular limiting plate. This limits the position of the extension cylinder after adjustment. The extension cylinder and sampling cylinder are then extended into the transformer oil tank. The extension rod is then pulled by the end plate to extend it beyond the pull rod, causing the pull rod to shift. The moving pull rod then pulls the piston within the extension cylinder. By adjusting the internal displacement of the sampling tube, transformer oil can be extracted, thus completing the sampling work. The length of the sampling tube can be extended, and by changing the depth of the extension tube inserted into the transformer oil tank, samples of transformer oil at different levels can be taken. This avoids the need to use multiple types of syringes to sample transformer oil at different levels. The structure is simple, the operation is convenient, and the accuracy of transformer oil test results is guaranteed. Moreover, when not in use, the extension tube can be stored inside the sampling tube, shortening the length of the sampling tube and reducing the space occupied by the sampling tube during transportation. This makes it convenient for sampling personnel to carry and highly practical. Attached Figure Description

[0015] Figure 1 This is a perspective view of a sampling device according to an embodiment of the present invention;

[0016] Figure 2This is a cross-sectional view of a sampling device according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic diagram showing the disassembled sampling tube and extension tube according to an embodiment of the present invention;

[0018] Figure 4 This is a perspective view of a piston and a connecting rod according to an embodiment of the present invention.

[0019] In the figure: 1. Sampling cylinder; 11. Annular boss; 111. First through hole; 2. Extension cylinder; 21. Annular limiting plate; 211. Rubber pad; 212. Second through hole; 22. Threaded ring; 3. Piston; 31. Pull rod; 311. Slide groove; 32. Extension rod; 33. End plate; 34. Rubber seat. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0021] Combination Figures 1-4As shown, the inner cavity of the sampling cylinder 1 is provided with an extension cylinder 2, which penetrates the sampling cylinder 1 and extends below it. An annular limiting plate 21 is provided at one end of the extension cylinder 2 located within the inner cavity of the sampling cylinder 1. An annular boss 11 for limiting the position of the annular limiting plate 21 is provided at the bottom of the cavity of the sampling cylinder 1. The annular limiting plate 21 is tightly abutted against the end face of the annular boss 11. A threaded ring 22 is provided at the lower end of the extension cylinder 2 located below the sampling cylinder 1. The threaded ring 22 is threadedly installed on the outer wall of the extension cylinder 2 and tightly abutted against the outer wall of the sampling cylinder 1. The lower end face and the inside of the extension cylinder 2 are provided with a piston 3 for drawing transformer oil. The end face of the piston 3 is provided with a pull rod 31 for driving its displacement. The inside of the pull rod 31 is slidably provided with an extension rod 32. One end of the extension rod 32 passes through the pull rod 31, the extension cylinder 2, and the sampling cylinder 1 and extends to the top of the sampling cylinder 1. The end of the extension rod 32 located above the pull rod 31 is provided with an end plate 33 for driving its displacement. The end plate 33 is attached to the upper end face of the sampling cylinder 1 and covers the opening of its inner cavity.

[0022] In one embodiment, when extending the length of the sampling cylinder 1, the extension cylinder 2 can be pulled to move it downwards through the first through hole 111 at the middle position of the annular boss 11. The annular limiting plate 21 installed at the end of the extension cylinder 2 is then pressed against the end face of the annular boss 11 to limit the position of the extension cylinder 2 and prevent it from detaching from the sampling cylinder 1. Then, the threaded ring 22 on the outer wall of the extension cylinder 2 is screwed to press against the lower end face of the sampling cylinder 1, clamping the annular boss 11 between the threaded ring 22 and the annular limiting plate 21. This limits the position of the extension cylinder 2 after adjustment and prevents it from shrinking into the interior of the sampling cylinder 1. In this way, the extension cylinder 2 is spliced ​​below the sampling cylinder 1, extending the length of the sampling cylinder 1. This method is suitable for sampling transformer oil at different liquid levels and is highly practical.

[0023] In one embodiment, after the sampling cylinder 1 and the extension cylinder 2 are spliced ​​together, the annular limiting plate 21 can press the rubber pad 211 tightly against the end face of the annular boss 11. The rubber pad 211 seals the gap between the annular limiting plate 21 and the annular boss 11, preventing transformer oil from entering the sampling cylinder 1 through the gap between the annular limiting plate 21 and the annular boss 11. This avoids the situation where transformer oil enters the sampling cylinder 1 and contaminates the transformer oil sample, thereby improving the quality of the transformer oil sample.

[0024] In one embodiment, when sampling transformer oil at different liquid levels, the depth to which the extension tube 2 is inserted into the transformer oil tank can be changed to sample transformer oil at different liquid levels. This avoids the need to use multiple types of syringes to sample transformer oil at different liquid levels. The structure is simple, the operation is convenient, and the accuracy of the transformer oil test results is guaranteed.

[0025] In one embodiment, when the extension cylinder 2 is moved downwards from the sampling cylinder 1, the extension cylinder 2 can drive the piston 3 to move, and the piston 3 can drive the pull rod 31 mounted on it to move. The pull rod 31 slides on the outer wall of the extension rod 32 through the slide groove 311, so that the extension rod 32 will not interfere with the displacement of the pull rod 31, the piston 3 and the extension cylinder 2, thus ensuring the position adjustment of the extension cylinder 2.

[0026] In one embodiment, since the end face area of ​​piston 3 is larger than the opening area of ​​the second through hole 212, when piston 3 is pulled to extract transformer oil, piston 3 can be limited by an annular limiting plate 21 to prevent piston 3 from disengaging from extension cylinder 2. This avoids leakage of transformer oil extracted into the inner cavity of extension cylinder 2 due to piston 3 disengaging from extension cylinder 2, and ensures the operation of transformer oil extraction.

[0027] In one embodiment, when carrying the sampling tube 1, the extension tube 2 can be directly stored in the inner cavity of the sampling tube 1, shortening the length of the sampling tube 1 and preventing the sampling tube 1 from occupying a large transportation space. This makes it convenient for sampling personnel to carry and is highly practical.

[0028] In one embodiment, when storing the extension rod 32, the extension rod 32 can be inserted into the groove 311 inside the pull rod 31, and then the end plate 33 can be attached to the upper end face of the sampling cylinder 1. The rubber seat 34 installed at the bottom of the end plate 33 is squeezed into the inner cavity of the sampling cylinder 1, causing the rubber seat 34 to deform. Then, the rubber seat 34 is pressed tightly against the inner wall of the sampling cylinder 1 under its own elasticity, increasing the friction between the rubber seat 34 and the inner wall of the sampling cylinder 1, preventing the rubber seat 34 from detaching from the sampling cylinder 1. This completes the positional limitation of the extension rod 32 and the end plate 33, avoiding the situation where the extension rod 32 moves to the outside of the sampling cylinder 1 due to sliding in the groove 311, which is inconvenient to carry. It is highly practical.

[0029] The working principle of this utility model is as follows: When sampling transformer oil, the extension cylinder 2 can be pulled to move it downwards through the first through hole 111 in the middle of the annular boss 11. The annular limiting plate 21 installed at the end of the extension cylinder 2 is then pressed tightly against the end face of the annular boss 11, limiting the position of the extension cylinder 2 and preventing it from detaching from the sampling cylinder 1. Then, the threaded ring 22 on the outer wall of the extension cylinder 2 is screwed down, pressing it tightly against the lower end face of the sampling cylinder 1. This clamps the annular boss 11 between the threaded ring 22 and the annular limiting plate 21, limiting the position of the extension cylinder 2 after adjustment and preventing it from contracting under force into the sampling cylinder 1. Inside, the extension cylinder 2 and sampling cylinder 1 are extended into the transformer oil tank. The extension rod 32 is pulled by the end plate 33, allowing it to extend to the outside of the pull rod 31 and causing the pull rod 31 to move. The moving pull rod 31 then pulls the piston 3 to move within the inner cavity of the extension cylinder 2, extracting transformer oil. This completes the transformer oil sampling. By changing the depth of the extension cylinder 2 inserted into the transformer oil tank, different levels of transformer oil can be sampled, avoiding the need for multiple types of syringes to sample transformer oil at different levels. The structure is simple, the operation is convenient, and the accuracy of the transformer oil test results is guaranteed. It is highly practical.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sampling device for transformer oil testing, comprising: A sampling cylinder (1) is characterized in that an extension cylinder (2) is provided in the inner cavity of the sampling cylinder (1), the extension cylinder (2) penetrates the sampling cylinder (1) and extends to its lower part, and an annular limiting plate (21) is provided at one end of the extension cylinder (2) located in the inner cavity of the sampling cylinder (1), an annular boss (11) for limiting the position of the annular limiting plate (21) is provided at the bottom of the cavity of the sampling cylinder (1), the annular limiting plate (21) is tightly attached to the end face of the annular boss (11), and a threaded ring (22) is provided at one end of the extension cylinder (2) located below the sampling cylinder (1), the threaded ring (22) is threadedly installed on the outer wall of the extension cylinder (2) and tightly The sampling cylinder (1) is attached to the lower end face of the sampling cylinder (1), and the extension cylinder (2) is provided with a piston (3) for extracting transformer oil. The piston (3) is provided with a pull rod (31) for driving its displacement on the end face of the piston (3). The extension rod (32) is slidably provided inside the pull rod (31). One end of the extension rod (32) passes through the pull rod (31), the extension cylinder (2), and the sampling cylinder (1) and extends to the top of the sampling cylinder (1). The end of the extension rod (32) above the pull rod (31) is provided with an end plate (33) for driving its displacement. The end plate (33) is attached to the upper end face of the sampling cylinder (1) and covers the opening of its inner cavity.

2. The sampling device for transformer oil testing according to claim 1, characterized in that, The annular boss (11) has a first through hole (111) at the middle position. The extension cylinder (2) extends through the first through hole (111) to the bottom of the sampling cylinder (1), and the end face area of ​​the annular limiting plate (21) is larger than the opening area of ​​the first through hole (111).

3. The sampling device for transformer oil testing according to claim 1, characterized in that, The lower end face of the annular limiting plate (21) is provided with a rubber pad (211) surrounding the outside of the extension cylinder (2), and the annular limiting plate (21) is attached to the end face of the annular boss (11) through the rubber pad (211).

4. The sampling device for transformer oil testing according to claim 1, characterized in that, The extension tube (2) has a second through hole (212) at the middle position that communicates with the inner cavity of the extension tube (2), and the pull rod (31) and the extension rod (32) extend through the second through hole (212) to the top of the extension tube (2).

5. A sampling device for transformer oil testing according to claim 4, characterized in that, The end face area of ​​the piston (3) is larger than the opening area of ​​the second through hole (212).

6. The sampling device for transformer oil testing according to claim 1, characterized in that, The pull rod (31) has a groove (311) inside, and the extension rod (32) is slidably installed inside the groove (311).

7. A sampling device for transformer oil testing according to claim 1, characterized in that, The lower end face of the end plate (33) is provided with a rubber seat (34) for defining its position around the outside of the extension rod (32). The rubber seat (34) is inserted into the inner cavity of the sampling tube (1) and closely attached to its cavity wall.

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