An oil sampling valve with a locking function

Abstract

This utility model discloses an oil sampling valve with a locking function, including a flange housing. The interior of the flange housing is hollow and forms the main oil passage. A locking cover is fixedly installed on the top of the flange housing through an opening. This utility model has an oil nozzle at the oil inlet, and the oil nozzle is designed with a variable diameter structure and a certain length guiding function, which can increase the outlet flow rate under the same container pressure. It has excellent anti-overflow and anti-spray functions. In addition, the oil nozzle can be replaced with the corresponding specification oil nozzle according to different sampling tools, making the locking oil sampling valve more versatile. At the same time, the oil nozzle end is equipped with a protective cover, and a third sealing gasket is provided at the connection with the flange housing, which can effectively prevent external contamination of the oil sampling part and enhance the anti-leakage function of the valve body. It can also achieve sealing in the event of leakage or failure of the main valve core, which can play a safety role in preventing secondary leakage.

Description

Technical Field

[0001] This utility model relates to the field of oil sampling valves, specifically an oil sampling valve with a locking function. Background Technology

[0002] Transformer oil is a crucial medium for monitoring oil-immersed transformers. Before, during, and after operation of a transformer, as well as after maintenance and even upon scrapping, oil samples need to be tested to evaluate its safety performance. Taking oil samples is an essential step in oil sampling, hence the development of oil sampling valves. There are many types of oil sampling valves on the market. Generally, they are installed at the flange connection of the oil tank wall in oil-immersed transformers, or at the opening of the external transformer oil pipeline, or by drilling a hole in the valve body of a regular valve to install an oil drain nozzle. These valves are simple in structure, lack a separate control system for the oil circuit, and are relatively crude. During sampling, transformer oil may be sprayed, polluting the surrounding environment. Furthermore, due to their simple structure and lack of secondary leak-proof safety devices, leakage at the oil sampling nozzle can occur if the main valve core is not sealed properly. During transformer operation, frequent core vibrations can cause conventional valves to open spontaneously under the influence of vibration, resulting in leakage. Accidental human error or improper operation can also lead to serious consequences. Therefore, our proposed oil sampling valve has a locking function. Utility Model Content

[0003] The purpose of this invention is to provide an oil sampling valve with a locking function to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an oil sampling valve with a locking function, comprising a flange housing, the interior of which is hollow and forms a main oil passage, a locking cover fixedly installed on the top of the flange housing through an opening, a plunger valve stem connected to the interior of the locking cover through a rectangular thread, a handwheel fixedly installed on the top of the plunger valve stem, and torque transmission between the plunger valve stem and the handwheel through a square shaft head and a square hole. A locking plate is provided on the upper part of the flange housing. The surface of the locking plate has a locking hole. A lead-sealed steel wire tie for use with a handwheel is provided inside the locking hole. A screw is fixedly installed at the bottom of the locking plate. The bottom end of the screw is screwed into the inside of the flange housing. A nut is threaded onto the surface of the screw. A spring washer is provided between the nut and the flange housing.

[0005] Preferably, the right end of the flange housing is machined with internal and external threads, an oil nozzle is fixedly installed on the flange housing via the internal thread, a third sealing gasket is provided between the flange housing and the oil nozzle, a protective cover is fixedly installed on the flange housing via the external thread, and a sealing ring is provided between the flange housing and the protective cover.

[0006] Preferably, a first sealing gasket is provided between the locking cover and the flange housing, a second sealing gasket is filled above the space between the plunger valve stem and the locking cover, a pressure block is fixedly installed on the top of the second sealing gasket, and a locking nut that cooperates with the pressure block is threadedly connected to the upper surface of the locking cover.

[0007] Preferably, the handwheel is provided with a switch indicator on its surface, which can guide the operator to operate the switch. The plunger valve rod, the handwheel and the switch indicator are fixedly connected by a nut.

[0008] Preferably, the flange housing has a tapered hole inside for use with the plunger valve stem.

[0009] Preferably, the bottom end of the plunger valve stem contacts the inner wall of the tapered bore, and the locking cover is connected to the flange housing by a thread.

[0010] Compared with the prior art, the beneficial effects of this utility model are: 1. This oil sampling valve with a locking function features an oil nozzle at the oil sampling port. The nozzle is designed with a variable diameter structure and a certain length guiding function, which increases the outlet flow rate under the same container pressure. It has excellent anti-overflow and anti-spray functions. Furthermore, the oil nozzle can be replaced with the corresponding specification oil nozzle according to different sampling tools, making the locking oil sampling valve more versatile. At the same time, the oil nozzle end is equipped with a protective cap, and a third sealing gasket is provided at the connection with the flange body. This effectively prevents external contamination of the oil sampling point and enhances the anti-leakage function of the valve body. It can also achieve sealing in the event of leakage or failure of the main valve core, playing a safety role in preventing secondary leakage.

[0011] 2. This oil sampling valve with a locking function is equipped with a locking plate, which is fastened to the flange housing by a screw. The locking plate has a locking hole, which allows the handwheel to be locked by a lock or lead seal wire tie, preventing the valve from opening by itself or being operated improperly by human error, and ensuring that the valve is in the required safe state. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the flange housing, locking cover, and oil nozzle structure of this utility model; Figure 2 This is a side view of the flange housing, nut, and spring washer structure of this utility model; Figure 3 This is a top view of the lock plate and lock hole structure of this utility model.

[0013] In the diagram: 1. Flange housing; 2. Plunger valve stem; 3. Locking cover; 4. First sealing gasket; 5. Screw; 6. Locking plate; 7. Switch indicator; 8. Nut; 9. Handwheel; 10. Locking nut; 11. Pressure block; 12. Second sealing gasket; 13. Sealing ring; 14. Oil nozzle; 15. Third sealing gasket; 16. Cover; 17. Lead seal wire tie; 18. Nut; 19. Spring washer; 20. Lock hole. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Example 1: Please refer to Figure 1-3 As shown, this utility model provides an oil sampling valve with a locking function, including a flange housing 1. The interior of the flange housing 1 is hollow and forms a main oil passage. A locking cover 3 is fixedly installed on the top of the flange housing 1 through an opening. A plunger valve stem 2 is connected to the interior of the locking cover 3 through a rectangular thread. A handwheel 9 is fixedly installed on the top of the plunger valve stem 2. Torque transmission is achieved between the plunger valve stem 2 and the handwheel 9 through a square shaft head and a square hole. Specifically, a locking plate 6 is provided on the top of the flange housing 1. The surface of the locking plate 6 has a locking hole 20. Inside the locking hole 20, a lead-sealed steel wire tie 17 is provided for use with the handwheel 9. A screw 5 is fixedly installed at the bottom of the locking plate 6. The bottom end of the screw 5 is screwed into the inside of the flange housing 1. A nut 18 is threaded onto the surface of the screw 5. A spring washer 19 is provided between the nut 18 and the flange housing 1. By setting the locking plate 6 and fastening the locking plate 6 to the flange housing 1 with the screw 5, and by opening the locking hole 20 on the locking plate 6, the handwheel 9 can be fixed by the lock or the lead-sealed steel wire tie 17 to prevent the valve from opening by itself or by human error, and to ensure that the valve is in the required safe state.

[0016] Specifically, the right end of the flange housing 1 is machined with internal and external threads. An oil nozzle 14 is fixedly installed on the flange housing 1 via the internal thread. A third sealing gasket 15 is placed between the flange housing 1 and the oil nozzle 14. A cover 16 is fixedly installed on the flange housing 1 via the external thread. A sealing ring 13 is placed between the flange housing 1 and the cover 16. A first sealing gasket 4 is placed between the locking cover 3 and the flange housing 1. A second sealing gasket 12 is filled above the space between the plunger valve stem 2 and the locking cover 3. A pressure valve is fixedly installed on the top of the second sealing gasket 12. Block 11, the upper surface of the locking cover 3 is threaded with a locking nut 10 that mates with the pressure block 11. The surface of the handwheel 9 is provided with a switch indicator 7, which guides the operator in switching operations. The plunger valve stem 2, the handwheel 9 and the switch indicator 7 are fixedly connected by a nut 8. The flange housing 1 has a tapered hole inside that mates with the plunger valve stem 2. The bottom end of the plunger valve stem 2 contacts the inner wall of the tapered hole. The bottom of the plunger valve stem 2 is conical and mates with the micro-tapered hole inside the flange housing 1. The micro-conical bore generatrix is ​​≤1.5mm, enabling the main oil circuit to open and close when the plunger valve stem 2 moves up and down. The micro-conical bore inside the flange housing 1 is more suitable for concentrating clamping force and facilitating the correction of the plunger valve stem 2. The sealing contact surface adopts metal-to-metal hard contact to avoid the aging effect of high oil temperature during long-term operation of the transformer on the sealing material, thereby extending the service life of the drain valve. The locking cover 3 is connected to the flange housing 1 by a thread. An oil nozzle 14 is provided at the oil outlet, and the oil nozzle 14 is designed with a variable diameter structure and a certain length guiding function. Yes, it can increase the outlet flow rate under the same container pressure, and has excellent anti-overflow and anti-spray functions. In addition, the corresponding specification of the oil nozzle 14 can be replaced according to different sampling tools, making the lockable oil sampling valve more versatile. At the same time, the oil nozzle 14 is equipped with a protective cover 16, and a third sealing gasket 15 is provided at the connection with the flange housing 1. This effectively prevents external contamination of the oil sampling part, strengthens the anti-leakage function of the valve body, and can also achieve sealing in the event of leakage or failure of the main valve core, playing a safety function to prevent secondary leakage.

[0017] Working Principle: This utility model is an oil sampling valve with a locking function. An oil nozzle 14 is provided at the oil sampling port, and the nozzle 14 is designed with a variable diameter structure and a certain length guiding function, achieving the effect of increasing the outlet flow rate under the same container pressure. It has excellent anti-overflow and anti-spray functions. Furthermore, the nozzle 14 can be replaced with the corresponding specification according to different sampling tools, making the locking oil sampling valve more versatile. Simultaneously, a protective cap 16 is provided at the end of the nozzle 14, and a third sealing gasket 15 is provided at the connection with the flange housing 1. This effectively prevents external contamination of the oil sampling area and enhances the anti-leakage function of the valve body. It can also achieve sealing in the event of leakage or failure of the main valve core, providing a safety function to prevent secondary leakage. Additionally, a locking plate 6 is provided and fastened to the flange housing 1 by a screw 5. A locking hole 20 is provided on the locking plate 6, allowing the handwheel 9 to be fixed by a lock or lead-sealed steel wire tie 17, preventing the valve from opening on its own or being operated improperly, ensuring the valve is in the required safe state.

[0018] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0019] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sampling valve with locking function, comprising a flange shell (1), characterized in that: The flange housing (1) is hollow inside and forms the main oil passage. A locking cover (3) is fixedly installed on the top of the flange housing (1) through an opening. A plunger valve stem (2) is connected inside the locking cover (3) through a rectangular thread. A handwheel (9) is fixedly installed on the top of the plunger valve stem (2). Torque is transmitted between the plunger valve stem (2) and the handwheel (9) through a square shaft head and a square hole. A locking plate (6) is provided on the upper part of the flange housing (1). A locking hole (20) is provided on the surface of the locking plate (6). A lead-sealed steel wire tie (17) for use with the handwheel (9) is provided inside the locking hole (20). A screw (5) is fixedly installed at the bottom of the locking plate (6). The bottom end of the screw (5) is screwed into the inside of the flange housing (1). A nut (18) is threaded on the surface of the screw (5). A spring washer (19) is provided between the nut (18) and the flange housing (1).

2. The oil sampling valve with locking function according to claim 1, characterized in that: The flange housing (1) has internal and external threads machined on its right end. The flange housing (1) is fixedly installed with an oil nozzle (14) through the internal thread. A third sealing gasket (15) is provided between the flange housing (1) and the oil nozzle (14). The flange housing (1) is fixedly installed with a cover (16) through the external thread. A sealing ring (13) is provided between the flange housing (1) and the cover (16).

3. The valve with lock function according to claim 1, characterized in that: A first sealing gasket (4) is provided between the locking cover (3) and the flange housing (1). A second sealing gasket (12) is filled above the plunger valve stem (2) and the locking cover (3). A pressure block (11) is fixedly installed on the top of the second sealing gasket (12). A locking nut (10) that cooperates with the pressure block (11) is threadedly connected to the upper surface of the locking cover (3).

4. The valve with lock function according to claim 1, characterized in that: The handwheel (9) is provided with a switch indicator (7) on its surface. The switch indicator (7) can guide the operator to operate the switch. The plunger valve rod (2), handwheel (9) and switch indicator (7) are fixedly connected by a nut (8).

5. The valve with lock function according to claim 1, characterized in that: The flange housing (1) has a tapered hole inside that is used to cooperate with the plunger valve stem (2).

6. The sample valve with lock function according to claim 5, characterized in that: The bottom end of the plunger valve stem (2) contacts the inner wall of the tapered hole, and the locking cover (3) is connected to the flange housing (1) by a thread.

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