Insulating oil sampling tool

Abstract

The application belongs to the field of insulating oil detection auxiliary tools, and particularly relates to an insulating oil sampling tool. The insulating oil sampling tool comprises a straw end and a piston end which are connected to each other in a nested mode, the piston end comprises a piston head, and a plurality of installation grooves are arranged on the side wall of the piston head. The length of the straw is 1000 mm, which is greater than the height of an oil drum (900 mm). The inner diameter of the straw is 22 mm. The volume of the straw is greater than 300 ml, and a 500-ml sampling bottle can be filled by twice operations. The long straw can suck insulating oil at different heights, and the sampling range can be homogenized. The gear and the rack are matched to drive the piston end to slowly discharge the liquid, so that the insulating oil is prevented from splashing, and the risk of misoperation is reduced.

Description

Technical Field

[0001] This application belongs to the field of auxiliary tools for insulating oil testing, and specifically relates to an insulating oil sampling tool. Background Technology

[0002] During storage and transportation, insulating oil continuously deteriorates. Therefore, oil sample analysis in oil depots is a crucial aspect of oil quality supervision. The supervision and maintenance of insulating oil includes the acceptance of newly received oil and the testing of existing stock. In recent years, with the significant increase in oil-filled equipment within the power grid, the quantity of stored insulating oil has also increased. To ensure a rapid supply of necessary insulating oil during equipment repairs and shorten maintenance time, the power supply company where the team is located requires that the testing time for stored insulating oil not exceed 80 minutes. Currently, transformer stored insulating oil testing is time-consuming, inefficient, and exceeds the requirements of higher authorities, becoming a major challenge that urgently needs to be addressed. The team summarized the operation of stored insulating oil testing, identifying six steps: "preparation," "oil drum sampling," "oil sample processing," "moisture test," "withstand voltage test," and "labeling." A flowchart of the stored insulating oil testing operation was drawn. Statistical analysis revealed a strong positive correlation between the sampling tool operation time and the critical time. The calculated critical time range was 12.3 minutes, indicating a significant impact on the critical time and making it a major factor.

[0003] Currently, the sampling tool involves attaching a clean white cloth strip to a 30mL glass syringe, which is then slowly lowered into the oil drum. The oil is then drawn out and poured into a sampling bottle. This process is repeated until the volumetric flask is full. Utility Model Content

[0004] Technical problem: The technical problem to be solved by this application is to provide a high-capacity, easy-to-operate sampling tool.

[0005] Technical Solution: To solve the above-mentioned technical problems, this application provides a new technical solution:

[0006] An insulating oil sampling tool includes a pipette end and a piston end that are nested and connected to each other. The piston end includes a piston head with several mounting grooves formed around its side wall. The pipette is 1000mm long, which is 900mm longer than the height of the oil container, and has an inner diameter of 22mm. Its volume is greater than 300ml, and a 500ml sampling bottle can be filled in just two operations. Furthermore, the long pipette can draw insulating oil from different heights, thus homogenizing the sampling range.

[0007] It also includes several sealing rings, which are set in the mounting groove;

[0008] The straw and piston head are made of stainless steel, which does not react with insulating oil, has strong oxidation resistance, high yield strength, and good mechanical properties, making it easy to machine. This differs from the PVC and aluminum materials used in the concurrent experiments, which respectively possess the advantages of not reacting with insulating oil and having strong corrosion resistance.

[0009] The sealing ring is a fluororubber O-ring. Fluororubber material has properties such as high temperature resistance, corrosion resistance, and oil resistance, and its operating temperature range is -60℃ to +250℃. It can seal highly corrosive media, such as strong acids and strong alkalis. The results of the comparative experiment on the selection of sealing ring materials are as follows:

[0010]

[0011] Furthermore, the piston end also includes a guide rod disposed at the end of the piston head, and the end of the guide rod is connected to a handle.

[0012] Furthermore, the guide rod has an external thread at its end, and a threaded hole is formed in the middle of the handle, allowing the guide rod and handle to be connected by threads. This facilitates the removal of the cap after removing the handle when replacing the piston end.

[0013] Furthermore, a cap is provided at the end of the straw, with a through hole in the center for the guide rod to pass through. The cap not only seals the upper cavity inside the straw, preventing dust and other impurities from entering and affecting the test results, but the through hole also limits the guide rod, making the piston end more axially oriented, reducing unnecessary wear and increasing service life.

[0014] Furthermore, an internal thread is provided on the inner wall of the cap, and a connecting thread is provided near the end of the straw, so that the cap and the straw are connected by the thread.

[0015] Furthermore, a cushioning pad is installed at the top inside the cap. Since the piston head is made of stainless steel, the cushioning pad effectively prevents the piston head from hitting the top of the cap and causing unnecessary damage during the pulling process.

[0016] Furthermore, the outer wall of the cap is textured with anti-slip grooves. During frequent use, the sealing ring needs to be replaced as needed, so the anti-slip groove design makes it easier to install and remove the cap.

[0017] Furthermore, a support is provided on the side of the straw near the top, and a gear is installed on the support. A rack is installed on the guide rod to mesh with the gear. Since the main body of the tool is made of stainless steel, it is not easy to control the force when discharging the liquid in the tube after sampling. Violent pushing can easily cause insulating oil to splash. Therefore, the gear and rack mechanism can slowly discharge the liquid.

[0018] Furthermore, the gear connection to the drive handle facilitates operation.

[0019] The cap has a through hole shaped like the cross-section of the guide rod.

[0020] Furthermore, a reverse support is provided near the inner wall of the straw at the top, which contacts the side wall of the guide rod, with the support facing the same direction as the rack. The reverse support optimizes the meshing between the guide rod and the gear.

[0021] The beneficial effects of this application are as follows:

[0022] 1. Large capacity (380.13mL) reduces the number of samplings and shortens the test time, meeting the 80-minute requirement.

[0023] 2. The stainless steel and fluoropolymer materials are corrosion-resistant and oil-resistant, ensuring no deterioration during long-term use.

[0024] 3. Threaded connections, anti-slip texture, and cushioning pads simplify operation and reduce the risk of misoperation.

[0025] 4. The 1000mm pipette covers the entire depth of the oil drum, ensuring uniform sampling and improving analytical accuracy.

[0026] 5. Limiting design and cushioning pads reduce wear and extend tool life.

[0027] 6. The gear and rack mechanism drives the piston end to achieve slow liquid discharge, preventing insulating oil from splashing and reducing the risk of misoperation. Attached Figure Description

[0028] Figure 1 This is a front view schematic diagram of Embodiment 1 of this application;

[0029] Figure 2 This is a perspective view of Embodiment 1 of this application;

[0030] Figure 3 This is a cross-sectional view and a partially enlarged schematic diagram of Embodiment 1 of this application;

[0031] Figure 4 This is a schematic diagram of the piston end and handle connection in Embodiment 1 of this application;

[0032] Figure 5 This is a schematic diagram of the piston end in Embodiment 1 of this application;

[0033] Figure 6 This is a schematic diagram of the straw in Embodiment 1 of this application;

[0034] Figure 7 This is a schematic diagram of the capping in Embodiment 1 of this application;

[0035] Figure 8 This is a schematic diagram of the sealing ring according to Embodiment 1 of this application;

[0036] Figure 9 This is a front view schematic diagram of Embodiment 2 of this application;

[0037] Figure 10 This is a three-dimensional schematic diagram of Embodiment 2 of this application.

[0038] In the diagram: 1. Straw; 2. Tightening opening; 3. Connecting thread; 4. Cap; 5. Internal thread; 6. Top cap; 7. Through hole; 8. Buffer pad; 9. Piston head; 10. Guide rod; 11. External thread; 12. Handle; 13. Circular groove; 14. Sealing ring; 15. Bracket; 16. Gear; 17. Rotating handle; 18. Support block. Detailed Implementation

[0039] Example 1:

[0040] As attached Figure 1-8 As shown: An insulating oil sampling device includes a pipette 1 made of 304 stainless steel, as referenced. Figure 6 The bottom of the straw 1 is fitted with a tightening opening 2 to prevent leakage during sample transfer. A connecting thread 3 is provided on a portion of the straw 1 near the top for connection with the internal thread 5 on the cap 4.

[0041] The structure of the cap 4 is referenced. Figure 7 It is a hollow barrel shape with an internal thread 5 on the inner wall that mates with the aforementioned connecting thread 3. The outer wall has a polygonal prism design as an anti-slip texture. One end is open, and the other end has a top cover 6 with a through hole 7 in the center. A buffer pad 8 is provided at the top cover 6 inside the cover 4.

[0042] It also includes a piston end embedded in the straw 1. Referring to 4 and 5, the piston end includes a piston head 9 located at the lower end and a guide rod 10 connected to the piston head 9. The guide rod 10 passes through the through hole 7 on the cover 4, and the end of the guide rod 10 is provided with an external thread 11, which is connected to the threaded hole on the handle 12.

[0043] The piston head 9 is also made of 304 stainless steel. The piston head 9 is cylindrical, and three parallel circular grooves 13 are formed around its sidewall for installing fluororubber O-rings 14. The shape of the O-ring 14 is as shown in the reference... Figure 8 .

[0044] Schematic diagram of the overall assembly of the sampling tool Figure 1-3 .

[0045] Example 2:

[0046] like Figure 9 , 10As shown, Embodiment 2 has the same general structure as Embodiment 1. The key difference lies in the fact that a support 15 is provided on one side of the top of the straw 1, and a gear 16 is mounted on the support 15. The shaft of the gear 16 is connected to a rotating handle 17. Correspondingly, a rack is provided on one side of the guide rod 10, which rotates in conjunction with the gear 16. After sampling, shaking the rotating handle 17 achieves uniform and slow drainage. The cap 4 has a through hole 7 shaped like the cross-section of the guide rod 10.

[0047] Reference Figure 9 The dotted line portion (piston head omitted) indicates that, to optimize the engagement between the rack and gear 16, a support block 18 is provided on the inner wall of the straw 1 near the top, contacting the side wall of the guide rod 10. The support faces the same direction as the rack, supporting the guide rod 10 and reducing its tilting in the opposite direction to the location of the gear 16. Those skilled in the art can also extend the support frame upwards on the opposite side of the bracket 15, placing the support block 18 above the horizontal plane where the gear 16 is located.

Claims

1. An insulating oil sampling tool, comprising a straw (1) end and a piston end nested together, characterized in that, The piston end includes a piston head (9), and several mounting grooves are opened around the side wall of the piston head (9); it also includes several sealing rings (14), which are set in the mounting grooves; the straw (1) and the piston head (9) are made of stainless steel; the sealing rings (14) are fluororubber O-rings (14); the piston end also includes a guide rod (10) set at the end of the piston head (9), and the end of the guide rod (10) is connected to a handle (12); a bracket (15) is set on the side of the straw (1) near the top, a gear (16) is set on the bracket (15), and a rack that meshes with the gear (16) is set on the guide rod (10).

2. The insulating oil sampling tool as described in claim 1, characterized in that, The guide rod (10) has an external thread (11) at its end, and the handle (12) has a threaded hole in the middle. The guide rod (10) and the handle (12) are connected by threads.

3. An insulating oil sampling tool as described in claim 2, characterized in that, The straw (1) is provided with a cap (4) at the end, and a through hole (7) is provided in the middle of the cap (4) for the guide rod (10) to pass through.

4. An insulating oil sampling tool as described in claim 3, characterized in that, The inner wall of the cap (4) is provided with an internal thread (5), and the straw (1) is provided with a connecting thread (3) near its end. The cap (4) and the straw (1) are connected by threads.

5. An insulating oil sampling tool as described in claim 4, characterized in that, A buffer pad (8) is provided at the top inside the cover (4).

6. An insulating oil sampling tool as described in any one of claims 3-5, characterized in that, The outer wall of the cover (4) is provided with anti-slip texture.

7. An insulating oil sampling tool as described in claim 3, characterized in that, The gear (16) is connected to the rotating handle (17); the cover (4) has the through hole (7) with the cross-sectional shape of the guide rod (10).

8. An insulating oil sampling tool as described in claim 1, characterized in that, The straw (1) has a support block (18) near the inner wall of the top end, which is in contact with the side wall of the guide rod (10), and the support direction is the same as the rack direction.

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