Current transformer oil drain valve structure

Abstract

The utility model relates to the technical field of electric power equipment accessories, in particular to a current transformer oil drain valve structure which is composed of a valve body, a valve shell, a channel, a protection assembly and other core components, a composite protection system is innovatively adopted for the inner wall of the valve body, and an epoxy zinc-rich coating on the bottom layer provides electrochemical protection. The middle ceramic coating enhances hardness and wear resistance, and the surface polytetrafluoroethylene coating realizes self-lubrication and chemical protection; an oil-resistant rubber sealing ring is embedded into the inner side of the valve seat, the sealing performance is ensured by matching with triple sealing design of a connecting pipe at an inlet and an outlet, a rubber sealing gasket and threads, and on the operation structure, the connecting rod in the valve shell and the rotating disc can be easily opened and closed by one hand through precise transmission design. According to the structure, through double optimization of materials and the structure, the problems that corrosion is prone to occurring, sealing is poor, and operation is inconvenient are effectively solved, excellent corrosion resistance and abrasion resistance are achieved, and the maintenance efficiency of power equipment can be remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of power equipment accessories technology, and in particular to a drain valve structure for a current transformer. It is mainly used for the discharge and replacement of insulating oil during the daily maintenance and repair of current transformers, and belongs to the field of power equipment maintenance components technology. Background Technology

[0002] In power systems, current transformers are core devices for current transformation and electrical isolation. The insulating oil filling them is crucial for enhancing insulation performance and assisting heat dissipation. During regular maintenance, the drain valve is responsible for draining the insulating oil. However, early current transformer drain valves mostly adopted a simple metal ball valve structure, with the valve body in direct contact with the insulating oil. Since the insulating oil may contain corrosive substances such as sulfides and moisture, the valve body is prone to rust and corrosion after long-term use, causing sealing failure and leakage of insulating oil. This not only wastes resources but also threatens the safe operation of the power system.

[0003] To address the corrosion problem, some drain valves have an anti-corrosion coating applied to the valve body surface. This method reduces direct contact between corrosive substances and the valve body by forming a protective layer on the valve body surface, thus alleviating corrosion to some extent.

[0004] However, this anti-corrosion coating solution also presents new problems. Under the scouring effect of oil flow and the friction of tiny particles, the coating is easily damaged. Once the coating is damaged, the valve body metal loses its protection and faces the risk of corrosion again. Moreover, a single coating protection cannot improve the problems of poor operation convenience and insufficient sealing reliability of the drain valve. For example, the connection sealing structure still uses ordinary threaded connections that are easy to loosen, the design of the operating parts is unreasonable, it is difficult to intuitively judge the valve's open and closed status, and the operation feel is poor and easy to slip. Utility Model Content

[0005] The purpose of this utility model is to provide a drain valve structure for a current transformer, which solves the technical problems of existing drain valves such as easy corrosion, unreliable sealing, and inconvenient operation, improves the reliability, durability and ease of operation of the drain valve, and ensures the efficient and safe maintenance of the current transformer.

[0006] To achieve the above objectives, this utility model provides a drain valve structure for a current transformer, including a valve body, a valve shell at the upper end of the valve body, a channel inside the valve body, a protective component on the inner wall of the valve body, the protective component including an epoxy zinc-rich coating, an epoxy zinc-rich coating on the inner wall of the valve body, a ceramic coating on the outer side of the epoxy zinc-rich coating, a polytetrafluoroethylene coating on the outer side of the ceramic coating, a valve seat in the middle of the channel, a rubber sealing ring on the inner side of the valve seat, an inlet at the front end of the valve body, a first connecting pipe at the front end of the inlet, a first rubber sealing gasket at the connection between the inlet and the first connecting pipe, and a first external thread on the outer side of the first connecting pipe.

[0007] The valve body has an outlet at its rear end, a connecting pipe at the rear of the outlet, and a second connecting pipe at the front end of the connecting pipe.

[0008] A second rubber sealing gasket is provided between the second connecting pipe and the connecting outlet pipe, a second external thread is provided on the outer side of the second connecting pipe, and a thread adapted to the second external thread is provided on the inner side of the outlet.

[0009] The valve housing has a connecting rod inside, and a rotating disk is provided at the upper end of the connecting rod.

[0010] The rotating disk has a switch mark on its upper end and anti-slip texture on its outer circumference.

[0011] The lower surface of the connecting rod is provided with a rotary thread, and the lower end of the connecting rod is provided with a valve core.

[0012] The valve housing has a threaded groove inside that is compatible with the rotating thread, and the first connecting pipe and the drain port of the current transformer are connected by threads.

[0013] This utility model discloses a drain valve structure for a current transformer. It incorporates a protective assembly inside the valve body consisting of an epoxy zinc-rich coating, a ceramic coating, and a polytetrafluoroethylene (PTFE) coating. The epoxy zinc-rich coating utilizes the sacrificial anode principle of zinc to preferentially protect the valve body metal, preventing rust even if the coating is partially damaged. The ceramic coating has high hardness, resisting the erosion and wear of particles in the oil. The PTFE coating has a smooth surface, low coefficient of friction, and non-stick properties, reducing oil flow resistance and preventing impurities from adhering. The synergistic effect of these three coatings significantly improves the valve body's corrosion resistance and wear resistance. A rubber sealing ring on the inner side of the valve seat mates with the valve core, and the rubber sealing gaskets at the inlet and outlet are threaded together, forming a multi-layered sealing structure that effectively prevents insulating oil leakage. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0016] Figure 2 This is a schematic cross-sectional view of the valve body according to an embodiment of the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of the connecting pipe according to an embodiment of the present invention.

[0018] Figure 4 This is a partial enlarged structural schematic diagram of an embodiment of the present invention.

[0019] Figure 5 This is a three-dimensional structural diagram of the first rubber sealing gasket according to an embodiment of the present utility model.

[0020] 1. Valve body; 2. Valve shell; 3. Channel; 4. Protective components; 401. Epoxy zinc-rich coating; 402. Ceramic coating; 403. PTFE coating; 5. Valve seat; 6. Rubber sealing ring; 7. Inlet; 8. First rubber sealing gasket; 9. First connecting pipe; 10. First external thread; 11. Outlet; 12. Connecting outlet pipe; 13. Second rubber sealing gasket; 14. Second connecting pipe; 15. Second external thread; 16. Connecting rod; 17. Rotating disc; 18. Switch indicator; 19. Anti-slip texture; 20. Rotating thread; 21. Valve core. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0022] Please see Figures 1-5 A drain valve structure for a current transformer includes a valve body 1, a valve shell 2 at the upper end of the valve body 1, a channel 3 inside the valve body 1, a protective component 4 on the inner wall of the valve body 1, the protective component 4 including an epoxy zinc-rich coating 401, an epoxy zinc-rich coating 401 on the inner wall of the valve body 1, a ceramic coating 402 on the outer side of the epoxy zinc-rich coating 401, a polytetrafluoroethylene coating 403 on the outer side of the ceramic coating 402, a valve seat 5 in the middle of the channel 3, a rubber sealing ring 6 on the inner side of the valve seat 5, an inlet 7 at the front end of the valve body 1, a first connecting pipe 9 at the front end of the inlet 7, a first rubber sealing gasket 8 at the connection between the inlet 7 and the first connecting pipe 9, and a first external thread 10 on the outer side of the first connecting pipe 9.

[0023] like Figures 1-4 As shown, the valve body 1 has an outlet 11 at its rear end, a connecting pipe 12 at the rear of the outlet 11, a second connecting pipe 14 at the front end of the connecting pipe 12, a second rubber sealing gasket 13 between the second connecting pipe 14 and the connecting pipe 12, a second external thread 15 on the outer side of the second connecting pipe 14, and a thread matching the second external thread 15 on the inner side of the outlet 11. The valve housing 2 has a connecting rod 16 inside, with a rotating disk 17 at the upper end of the connecting rod 16. The protective assembly 4 on the inner wall of the valve body 1 has an epoxy zinc-rich coating 40. 1. The valve body metal is protected by the sacrificial anode principle. The ceramic coating 402 provides high hardness and wear resistance protection. The polytetrafluoroethylene coating 403 prevents impurities from adhering and reduces oil flow resistance. The three coatings work together to effectively resist the corrosion and wear of insulating oil and improve the service life of the drain valve. The first rubber sealing gasket 8 between the inlet 7 and the first connecting pipe 9, and the second rubber sealing gasket 13 between the second connecting pipe 14 and the connecting outlet pipe 12 at the outlet 11, together with the threaded connection, form a double seal. After testing, the sealing performance is improved, which greatly reduces the risk of insulating oil leakage.

[0024] like Figures 1-4 As shown, the upper end of the rotating disk 17 is provided with a switch mark 18, the outer circumferential surface of the rotating disk 17 is provided with anti-slip texture 19, the lower surface of the connecting rod 16 is provided with a rotating thread 20, the lower end of the connecting rod 16 is provided with a valve core 21, the inside of the valve body 2 is provided with a threaded groove that matches the rotating thread 20, the first connecting pipe 9 and the drain port of the current transformer are connected by threads, the switch mark 18 on the rotating disk 17 makes it easy for the operator to intuitively judge the valve opening and closing status, the anti-slip texture 19 on the outer circumferential surface increases the friction and prevents slippage during operation, making valve operation easier and more accurate, and improving maintenance efficiency.

[0025] Working Principle: When draining oil from the current transformer, the operator holds the rotating disc 17 and rotates it in the specified direction according to the switch marking 18. Since the rotating disc 17 is fixedly connected to the connecting rod 16, and the rotating thread 20 of the connecting rod 16 engages with the threaded groove inside the valve body 2, the rotation of the rotating disc 17 causes the connecting rod 16 to move downwards, thereby causing the valve core 21 to leave the valve seat 5. At this time, the insulating oil, under the action of gravity, flows through the channel 3 of the valve body 1, through the outlet 11 and the connecting pipe 12, and is discharged. During the flow of the insulating oil, the protective components 4 on the inner wall of the valve body 1 effectively resist the corrosion and wear of the oil. The polytetrafluoroethylene coating 403 reduces the oil flow resistance, ensuring smooth oil discharge. In the protective components 4 on the inner wall of the valve body 1, the epoxy zinc-rich coating 401 protects the valve body metal through the sacrificial anode principle, and the ceramic coating 402 provides high-hardness, wear-resistant protection. The PTFE coating 403 prevents impurities from adhering and reduces oil flow resistance. The three-layer coating works synergistically to effectively resist the corrosion and wear of insulating oil, thus improving the service life of the drain valve. The first rubber gasket 8 between the inlet 7 and the first connecting pipe 9, and the second rubber gasket 13 between the second connecting pipe 14 and the connecting pipe 12 at the outlet 11, are connected by threads to form a double seal. After testing, the sealing performance is improved, greatly reducing the risk of insulating oil leakage. After the drain operation is completed, the rotating disc 17 is rotated in the opposite direction, and the connecting rod 16 drives the valve core 21 to move upward until the valve core 21 is tightly attached to the valve seat 5. The rubber sealing ring 6 further enhances the sealing effect, and the drain valve is closed. Throughout the entire operation, the rubber sealing gaskets between the inlet 7 and the first connecting pipe 9, and between the outlet 11 and the second connecting pipe 14, are connected by threads to maintain a good sealing state and prevent insulating oil leakage.

[0026] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A drain valve structure for a current transformer, comprising a valve body, characterized in that: The valve body has a valve shell at its upper end, a channel inside, and a protective component on its inner wall, including an epoxy zinc-rich coating. The inner wall of the valve body is coated with an epoxy zinc-rich coating, and a ceramic coating is applied to the outer side of the epoxy zinc-rich coating. A polytetrafluoroethylene (PTFE) coating is applied to the outer side of the ceramic coating. A valve seat is located in the middle of the channel, and a rubber sealing ring is provided on the inner side of the valve seat. An inlet is located at the front end of the valve body, and a first connecting pipe is located at the front end of the inlet. A first rubber sealing gasket is provided at the connection between the inlet and the first connecting pipe, and a first external thread is provided on the outer side of the first connecting pipe.

2. The structure of a current transformer drain valve as described in claim 1, characterized in that, The valve body has an outlet at its rear end, a connecting pipe at the rear of the outlet, and a second connecting pipe at the front end of the connecting pipe.

3. The structure of a current transformer drain valve as described in claim 2, characterized in that, A second rubber sealing gasket is provided between the second connecting pipe and the connecting outlet pipe. A second external thread is provided on the outer side of the second connecting pipe, and a thread that matches the second external thread is provided on the inner side of the outlet.

4. The structure of a current transformer drain valve as described in claim 1, characterized in that, The valve housing is provided with a connecting rod inside, and a rotating disk is provided at the upper end of the connecting rod.

5. The structure of a current transformer drain valve as described in claim 4, characterized in that, The upper end of the rotating disk is provided with a switch mark, and the outer circumferential surface of the rotating disk is provided with anti-slip texture.

6. The structure of a current transformer drain valve as described in claim 4, characterized in that, The lower surface of the connecting rod is provided with a rotary thread, and the lower end of the connecting rod is provided with a valve core.

7. The structure of a current transformer drain valve as described in claim 1, characterized in that, The valve housing has a threaded groove inside that is adapted to the rotating thread, and the first connecting pipe and the drain port of the current transformer are connected by threads.

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