用于绝缘油溶水性测试的止漏针头
By designing a leak-proof needle with a check valve and a leak-proof structure, the problem of leakage of insulating oil droplets was solved, ensuring the accuracy of testing and the purity of the oil sample, and achieving consistency of oil droplet volume and leak prevention effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TONGJIAN ELECTRICAL APPLIANCES MFG BAODING CITY
- Filing Date
- 2025-07-02
- Publication Date
- 2026-07-17
AI Technical Summary
Existing insulating oil dripping needles lack leak-proof function, causing residual oil in the needle to spontaneously leak after dripping, affecting test accuracy and causing waste.
A leak-proof needle was designed, which includes a check valve structure and a leak-proof structure. Through a two-stage linkage sealing mechanism, it ensures that the oil flows only when actively pressurized and automatically closes when the pressure is lost, thus preventing leakage.
It achieves consistency in oil droplet volume and testing accuracy, avoids dosage deviations caused by improper operation, protects the purity of oil samples, and reduces the intrusion of oxidized impurities and dust.
Smart Images
Figure CN224518723U_ABST
Abstract
Claims
1. A leak-proof needle for testing the water solubility of insulating oil, comprising a testing device (1), characterized in that, include: A dripping needle (7) and a flow channel (3) fixedly connected to the dripping needle (7). A semi-circular check structure (4) is provided inside the flow channel (3). The check structure (4) is hinged to the inner wall of the flow channel (3). A leak-proof structure (5) is also provided inside the flow channel (3). The leak-proof structure (5) is slidably connected to the inner wall of the flow channel (3), and the leak-proof structure (5) abuts against the check structure (4).
2. The leak-proof needle for testing the water-solubility of insulating oil according to claim 1, wherein The check valve structure (4) includes two semi-circular butterfly plates (401) and two spring hinges (402). The inner wall of the flow pipe (3) is provided with two spring hinges (402). The spring hinges (402) are connected to the semi-circular butterfly plates (401). The opening direction of the semi-circular butterfly plates (401) is the same as the flow direction. The semi-circular butterfly plates (401) are normally closed.
3. The leak resistant needle for testing water solubility of insulating oil according to claim 2, wherein The leak-proof structure (5) includes a connecting ring (501), a connecting pipe (502), a torsion spring (503), a reset ring (504), a sealing part, and a flow-pushing part. The connecting ring (501) abuts against the semi-circular butterfly plate (401), and the outer wall of the connecting ring (501) abuts against the inner wall of the flow pipe (3). The connecting pipe (502) is inserted into the connecting ring (501). A sealing part is also fixedly connected inside the flow pipe (3), and the sealing part is located in the connecting ring (501). Between the connecting pipe (502), a flow-pushing part is provided on the connecting ring (501), the reset ring (504) is sleeved on the connecting pipe (502), and the outer wall of the reset ring (504) is fixedly connected to the inner wall of the flow pipe (3). The torsion spring (503) is also sleeved on the connecting pipe (502), one end of the torsion spring (503) is fixedly connected to the reset ring (504), and the other end of the torsion spring (503) is fixedly connected to the connecting ring (501).
4. The leak resistant needle for testing water solubility of insulating oil according to claim 3, wherein The sealing part includes a sealing plate (505) and a connecting rib (506). The sealing plate (505) is fixedly connected to the inner wall of the flow pipe (3) through the connecting rib (506), and the area of the sealing plate (505) corresponds to the flow area of the connecting pipe (502).
5. The leak resistant needle for testing water solubility of insulating oil according to claim 4, wherein The flow propulsion section includes a flow propulsion block (507) and a flow propulsion groove (508). The inner wall of the connecting ring (501) is provided with a plurality of flow propulsion blocks (507). The connecting pipe (502) is provided with a plurality of flow propulsion grooves (508) corresponding to the flow propulsion blocks (507). The angle between the flow propulsion block (507) and the connecting rib (506) is 90°.