Marine check valve body structure resistant to seawater corrosion

Abstract

This invention relates to the field of check valve technology, specifically to a marine stop check valve body structure resistant to seawater corrosion. The structure includes a valve body and a valve stem, with the inner cavity of the valve body and the valve stem installed together. A protective component, a safeguard component, and a cleaning component are sequentially arranged on the top of the valve body. The protective component includes a sealing cap, a mounting rod, and a rotating rod. The top of the sealing cap is rotatably connected to the valve stem, and a sealing sleeve is connected to the top of the valve body. This invention, through the coordinated use of the sealing sleeve, sealing cap, and connecting plate in the protective component, physically shields the exposed valve stem during the valve stem's upward opening process. This follow-up sealing structure effectively prevents direct contact between external humid air and salt spray media and the valve stem surface, thereby slowing down the oxidation and corrosion rate of the threaded parts, reducing the risk of valve stem jamming or inability to rotate due to corrosion, and extending the valve's operational lifespan in harsh environments.

Description

Technical Field

[0001] This invention relates to the field of check valve technology, and specifically to a valve body structure for a marine shut-off check valve that is resistant to seawater corrosion. Background Technology

[0002] The marine gate check valve, resistant to seawater corrosion, is a critical pipeline accessory designed specifically for marine environments. It combines the shut-off function of a gate valve with the backflow prevention function of a check valve. It is typically made of corrosion-resistant materials such as bronze, duplex stainless steel, or cast steel with a special anti-corrosion coating to effectively resist the electrochemical corrosion and erosion of high-salinity, high-humidity seawater. The valve's internal structure is optimized to ensure reliable sealing performance and flexible opening and closing even under complex conditions such as ship rolling and vibration.

[0003] Existing check valves still have certain limitations in environmental adaptability in practical applications. These valves typically rely on the rising and falling motion of a valve stem (screw) to drive the valve core for opening and closing. When the valve is open, the valve stem and its threaded surface are completely exposed to the external environment. Especially in high-humidity, high-salt-spray conditions such as offshore platforms, ship engine rooms, or coastal facilities, the exposed metal threads are highly susceptible to electrochemical reactions with moisture and chloride ions in the air, leading to a gradual increase in surface oxidation and corrosion over time. This corrosion not only increases the frictional resistance between the threaded pairs but also causes localized seizing or jamming, making it difficult for operators to smoothly turn the handwheel when adjusting or closing the valve, and sometimes even preventing the valve stem from turning at all. This affects the efficiency of daily maintenance and the convenience of operation. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a marine shut-off check valve body structure resistant to seawater corrosion. This effectively solves the problem that in existing shut-off check valves, the valve stem threads are exposed when the valve is open, making them prone to oxidation and corrosion in high-humidity, salt-spray environments such as the ocean. Corrosion can lead to increased friction or even jamming of the threaded pair, making it difficult or impossible to operate the handwheel, thus reducing equipment maintenance efficiency and ease of use.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a marine check valve body structure resistant to seawater corrosion, comprising a valve body and a valve stem. The inner cavity of the valve body is installed with the valve stem. A protective component, a safeguard component, and a cleaning component are sequentially arranged on the top of the valve body. The protective component includes a sealing cover, a mounting rod, and a rotating rod. The top of the sealing cover is rotatably connected to the valve stem. A sealing sleeve is connected to the top of the valve body. The bottom of the sealing cover is installed with the sealing sleeve. A connecting plate is fixedly connected to the outer surface of the sealing cover. A toothed plate is fixedly connected to the inner side of the connecting plate. A first gear is fixedly connected to the outer surface of the rotating rod, and the first gear meshes with the toothed plate.

[0006] Furthermore, a protective box is fixedly connected to the top of the valve body, one side of the protective box is rotatably connected to the rotating rod, and the inner cavity of the protective box is rotatably connected to the mounting rod.

[0007] Furthermore, bevel gears are fixedly connected to the outer surfaces of the rotating rod and the mounting rod, and the two bevel gears mesh with each other.

[0008] Furthermore, the protective component includes a guide rod, the bottom end of the mounting rod is fixedly connected to the guide rod, the outer surface of the guide rod is provided with a guide groove, and a push rod is slidably connected to the inner side of the guide groove.

[0009] Furthermore, a transport pipe is fixedly connected to the top of the valve body, a piston disc is slidably connected to the inner cavity of the transport pipe, a connecting rod is fixedly connected to the top of the piston disc, and the top end of the connecting rod is fixedly connected to the push rod.

[0010] Furthermore, an air valve is installed on one side of the transport pipeline, a nozzle is installed on one side of the transport pipeline, a positioning box is fixedly connected to the top of the valve body, one end of the nozzle penetrates the inner cavity of the positioning box, and a solenoid valve is installed on one side of the transport pipeline.

[0011] Furthermore, an oil storage box is fixedly connected to the top of the valve body, and one end of the transport pipeline is connected to the oil storage box.

[0012] Furthermore, a telescopic rod is fixedly connected to the outer surface of the transport pipeline, one end of the telescopic rod is fixedly connected to a push rod, a limit plate is fixedly connected to the top of the valve body, and one end of the push rod is slidably connected to the limit plate.

[0013] Furthermore, the cleaning assembly includes a second gear, the outer surface of which is fixedly connected to the mounting rod. A fixed box is fixedly connected to the top of the valve body. A third gear is rotatably connected to the inner cavity of the fixed box, and the second gear and the third gear mesh with each other. A cleaning box is fixedly connected to the top of the third gear, and a plurality of bristles are fixedly connected to the inner cavity of the cleaning box.

[0014] Furthermore, a threaded sleeve is rotatably connected to the top of the valve body, and the inner cavity of the threaded sleeve is threadedly connected to the valve stem.

[0015] Beneficial effects: The technical solution provided by this invention has the following advantages compared with the known prior art: I. This invention utilizes a combination of a sealing sleeve, a sealing cap, and a connecting plate in the protective assembly to physically shield the exposed valve stem during its upward opening process. This follow-up sealing structure effectively prevents direct contact between external humid air and salt spray media and the valve stem surface, thereby slowing down the oxidation and corrosion rate of the threaded parts, reducing the risk of valve stem jamming or inability to rotate due to corrosion, and extending the valve's operational lifespan in harsh environments.

[0016] Second, the guide rod, guide groove, and piston disc in the protection assembly, driven by the sealing cover, convert the linear motion of the valve stem into the reciprocating suction action of the piston disc. This allows the lubricating oil or rust remover and other maintenance liquids in the oil reservoir to be evenly sprayed onto the valve stem surface through the nozzle. Simultaneously, the cleaning assembly, driven by the mounting rod, rotates the second gear, cleaning box, and brushes synchronously to spread and clean the liquid adhering to the valve stem. This process not only ensures that the maintenance medium fully covers and penetrates the threaded surface but also promptly removes loose rust and impurities. This allows the valve stem to undergo basic maintenance simultaneously during routine opening and closing operations, reducing the frequency of additional downtime for maintenance and improving the convenience and reliability of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional rear view of the overall structure of the present invention; Figure 3 This is a three-dimensional side view sectional view of the positioning box structure of the present invention; Figure 4 This is a three-dimensional side view sectional view of the protective box structure of the present invention; Figure 5 This is a side sectional view of the fixed box structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle; Figure 7 This is a three-dimensional schematic diagram of the guide rod structure of the present invention; Figure 8 This is a three-dimensional schematic diagram of the disassembled closed pipe structure of the present invention; Figure 9 This is a three-dimensional schematic diagram of the cleaning box structure of the present invention; Figure 10 This is a perspective view of the second and third gear structures of the present invention from a bottom view. Figure 11 This is a three-dimensional schematic diagram of the connecting plate structure of the present invention; Figure 12 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B.

[0019] Reference numerals: 1. Valve body; 11. Valve stem; 12. Threaded sleeve; 2. Protective assembly; 21. Sealing sleeve; 22. Connecting plate; 23. Toothed plate; 24. Rotating rod; 25. First gear; 26. Mounting rod; 27. Bevel gear; 28. Sealing cover; 29. ​​Protective box; 3. Protective assembly; 31. Guide rod; 32. Guide groove; 33. Push rod; 34. Transport pipe; 35. Piston disc; 36. Connecting rod; 37. Air valve; 38. Solenoid valve; 39. Nozzle; 310. Positioning box; 311. Oil reservoir; 312. Telescopic rod; 313. Limiting plate; 4. Cleaning assembly; 41. Second gear; 42. Fixing box; 43. Third gear; 44. Cleaning box; 45. Brush bristles. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] The present invention will be further described below with reference to embodiments.

[0022] See attached document Figures 1-12The valve body includes a valve body 1 and a valve stem 11. The inner cavity of the valve body 1 and the valve stem 11 are installed together. The valve body 1 is selected as a shut-off check valve. The valve stem 11 is a key transmission component in the valve that connects the actuator such as a handwheel or electric actuator to the valve disc or valve core. It accurately transmits the external operating torque to the sealing pair through its own lifting, rotating, or combined motion. This realizes the valve's opening, closing, and flow regulation functions. The valve stem 11 is a prior art structure, so it will not be described in detail here. The top of the valve body 1 is sequentially provided with a protective component 2, a protective component 3, and a cleaning component 4. The protective component 2 includes a sealing cover 28 and a mounting rod 26.

[0023] See attached document Figures 1-6 The top of the sealing cover 28 is rotatably connected to the valve stem 11. A sealing sleeve 21 is connected to the top of the valve body 1. The top of the sealing sleeve 21 is installed in a snap-fit ​​manner with the top of the valve stem 11, allowing for periodic disassembly of the sealing sleeve 21 for inspection and maintenance of the valve stem 11. The bottom of the sealing cover 28 is installed with the sealing sleeve 21, specifically, by bolts. The sealing sleeve 21 can be a flexible sealing sleeve such as a sealing hose or a bellows, facilitating protection of the valve stem 11 and preventing prolonged external leakage. This allows users to remove the sealing cover 28 to release the sealing sleeve 21 and perform periodic inspections of the valve stem 11. See [link / reference]. Figure 5 A connecting plate 22 is fixedly connected to the outer surface of the sealing cover 28, and a through cavity is provided on one side of the connecting plate 22. The through cavity facilitates the up and down movement of the rotating rod 24. A toothed plate 23 is fixedly connected to the inner side of the connecting plate 22.

[0024] See attached document Figures 3-12 A first gear 25 is fixedly connected to the outer surface of the rotating rod 24, and the first gear 25 meshes with the toothed plate 23. The protective component 2, the protective component 3, and the cleaning component 4 are treated with corrosion-resistant and moisture-resistant materials, for example, by adding a coating or other appropriate materials. A threaded sleeve 12 is rotatably connected to the top of the valve body 1, and the inner cavity of the threaded sleeve 12 is threadedly connected to the valve stem 11.

[0025] In one embodiment, a cleaning brush can be installed between the sealing sleeve 21 and the sealing cover 28, that is, at the bottom of the sealing cover 28, so that when the sealing cover 28 is removed to inspect the valve stem 11, the surface of the valve stem 11 can be cleaned during the disassembly process, making it easier for subsequent users to observe whether the surface of the valve stem 11 needs maintenance.

[0026] See attached document Figures 3-12A protective box 29 is fixedly connected to the top of the valve body 1. One side of the protective box 29 is rotatably connected to the rotating rod 24 to support the rotating rod 24. The inner cavity of the protective box 29 is rotatably connected to the mounting rod 26. The outer surfaces of the rotating rod 24 and the mounting rod 26 are respectively fixedly connected to bevel gears 27, and the two bevel gears 27 mesh with each other. One end of the rotating rod 24 passes through the inner cavity of the protective box 29. The protective assembly 3 includes a guide rod 31. The bottom end of the mounting rod 26 is fixedly connected to the guide rod 31. A guide groove 32 is opened on the outer surface of the guide rod 31, and a push rod 33 is slidably connected to the inner side of the guide groove 32.

[0027] See attached document Figures 4-12 A transport pipe 34 is fixedly connected to the top of the valve body 1. The transport pipe 34 is a T-shaped pipe. A piston disc 35 is slidably connected to the inner cavity of the transport pipe 34. A connecting rod 36 is fixedly connected to the top of the piston disc 35. The top end of the connecting rod 36 is fixedly connected to the push rod 33. The top end of the connecting rod 36 penetrates the top of the inner cavity of the transport pipe 34. The part where the connecting rod 36 penetrates and contacts the transport pipe 34 is sealed, such as with a sealing gasket or sealing ring. An air valve 37 is installed on one side of the transport pipe 34, and a nozzle 39 is installed on the other side of the transport pipe 34. The function of the air valve 37 is to balance the air pressure. A positioning box 310 is fixedly connected to the top of the valve body 1. One end of the nozzle 39 penetrates the inner cavity of the positioning box 310. The nozzle of the nozzle 39 is set in a conical shape, so that the nozzle 39 can spray a large area of ​​the valve stem 11. The top end of the valve stem 11 penetrates the outer side of the inner cavity of the positioning box 310, and the part where the valve stem 11 penetrates and contacts the positioning box 310 is sealed with sealing measures, such as sealing rings or sealing gaskets, to prevent liquid leakage when the valve body 1 is spraying oil.

[0028] See attached document Figures 5-12 A solenoid valve 38 is installed on one side of the transport pipe 34. The solenoid valve 38 can replace a stop valve or other valves. An oil reservoir 311 is fixedly connected to the top of the valve body 1. A liquid inlet pipe is connected to the top of the oil reservoir 311. Through the liquid inlet pipe, the user can pour in liquids such as lubricating oil or rust remover into the oil reservoir 311 for maintenance. One end of the transport pipe 34 is connected to the oil reservoir 311. The installation of the solenoid valve 38 prevents liquid from flowing back into the oil reservoir 311 during the operation of the piston disc 35. A telescopic rod 312 is fixedly connected to the outer surface of the transport pipe 34. One end of the telescopic rod 312 is fixedly connected to the push rod 33. A limit plate 313 is fixedly connected to the top of the valve body 1. One end of the push rod 33 is slidably connected to the limit plate 313. The telescopic rod 312 and the limit plate 313 work together to support and limit the push rod 33, preventing the push rod 33 from shifting position or becoming unstable during operation.

[0029] See attached document Figures 3-12The cleaning assembly 4 includes a second gear 41, the outer surface of which is fixedly connected to the mounting rod 26. A fixed box 42 is fixedly connected to the top of the valve body 1. A third gear 43 is rotatably connected to the inner cavity of the fixed box 42. An anti-collision groove is provided on one side of the fixed box 42 to facilitate the movement of the third gear 43. The second gear 41 and the third gear 43 mesh with each other. A cleaning box 44 is fixedly connected to the top of the third gear 43. Several brush bristles 45 are fixedly connected to the inner cavity of the cleaning box 44, and the brush bristles 45 are used in conjunction with the valve stem 11. The fixed box 42 and the cleaning box 44 are respectively bolted with sealing plates. When the sealing plates are installed with the fixed box 42 and the cleaning box 44, sealing strips or other sealing measures are used to facilitate the user to disassemble the sealing plates later and to centrally clean the impurities swept by the brush bristles 45.

[0030] In one embodiment, the second gear 41 and the third gear 43 are replaced with pulleys or timing pulleys. This installation method is not suitable for valve body 1 because pulleys and timing pulleys experience greater wear in marine environments, leading to frequent structural replacements, and are not suitable for this solution.

[0031] Specifically, when the user manually rotates the valve stem 11 to raise it and open the valve body 1, the valve stem 11 simultaneously drives the sealing sleeve 21 and the sealing cover 28 to move upward. The sealing cover 28 drives the toothed plate 23 to mesh with the first gear 25 via the connecting plate 22, and then drives the guide rod 31 to rotate through the transmission chain of the rotating rod 24, bevel gear 27 and mounting rod 26. The guide rod 31 needs to rotate multiple times before it can push the push rod 33 to move up and down reciprocally via the guide groove 32, and then push the connecting rod 36 via the push rod 33 to drive the piston disc 35 to draw liquid in the oil storage box 311, and spray it onto the threaded surface of the valve stem 11 through the nozzle 39. Since the valve stem 11 is in a spiral upward state when it cooperates with the threaded sleeve 12, the nozzle 39 can evenly cover different height positions. At the same time, the mounting rod 26 also drives the second gear 41 and the third gear 43 to mesh and rotate, so that the third gear 43 drives the cleaning box 44 and the brush 45 to rotate, and cleans and smooths the surface of the valve stem 11 that has been sprayed with liquid. This structure can automatically apply lubricating oil or rust remover during the upward movement of the valve stem 11, reducing its direct exposure to humid air, delaying aging, and maintaining smooth operation.

[0032] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A marine check valve body structure resistant to seawater corrosion, comprising a valve body (1) and a valve stem (11), characterized in that, The inner cavity of the valve body (1) is installed with the valve stem (11). The top of the valve body (1) is provided with a protective component (2), a protective component (3) and a cleaning component (4) in sequence. The protective component (2) includes a sealing cover (28), a mounting rod (26) and a rotating rod (24). The top of the sealing cover (28) is rotatably connected to the valve stem (11). The top of the valve body (1) is connected with a sealing sleeve (21). The bottom of the sealing cover (28) is installed with the sealing sleeve (21). A connecting plate (22) is fixedly connected to the outer surface of the sealing cover (28). A toothed plate (23) is fixedly connected to the inner side of the connecting plate (22). A first gear (25) is fixedly connected to the outer surface of the rotating rod (24), and the first gear (25) meshes with the toothed plate (23).

2. The valve body structure of a marine stop check valve resistant to seawater corrosion according to claim 1, characterized in that, A protective box (29) is fixedly connected to the top of the valve body (1). One side of the protective box (29) is rotatably connected to the rotating rod (24), and the inner cavity of the protective box (29) is rotatably connected to the mounting rod (26).

3. The valve body structure of a marine stop check valve resistant to seawater corrosion according to claim 2, characterized in that, The outer surfaces of the rotating rod (24) and the mounting rod (26) are respectively fixedly connected with bevel gears (27), and the two bevel gears (27) mesh with each other.

4. The valve body structure of a marine stop check valve resistant to seawater corrosion according to claim 1, characterized in that, The protective component (3) includes a guide rod (31), the bottom end of the mounting rod (26) is fixedly connected to the guide rod (31), the outer surface of the guide rod (31) is provided with a guide groove (32), and a push rod (33) is slidably connected to the inner side of the guide groove (32).

5. The valve body structure of a marine stop check valve resistant to seawater corrosion according to claim 4, characterized in that, The top of the valve body (1) is fixedly connected to a transport pipe (34), and the inner cavity of the transport pipe (34) is slidably connected to a piston disc (35). The top of the piston disc (35) is fixedly connected to a connecting rod (36), and the top end of the connecting rod (36) is fixedly connected to a push rod (33).

6. The valve body structure of a marine stop check valve resistant to seawater corrosion according to claim 5, characterized in that, A gas valve (37) is installed on one side of the transport pipe (34), a nozzle (39) is installed on one side of the transport pipe (34), a positioning box (310) is fixedly connected to the top of the valve body (1), one end of the nozzle (39) penetrates the inner cavity of the positioning box (310), and a solenoid valve (38) is installed on one side of the transport pipe (34).

7. The valve body structure of a marine stop check valve resistant to seawater corrosion according to claim 6, characterized in that, An oil storage box (311) is fixedly connected to the top of the valve body (1), and one end of the transport pipe (34) is connected to the oil storage box (311).

8. The valve body structure of a marine stop check valve resistant to seawater corrosion according to claim 5, characterized in that, The outer surface of the transport pipe (34) is fixedly connected to a telescopic rod (312), one end of which is fixedly connected to a push rod (33), and a limit plate (313) is fixedly connected to the top of the valve body (1), and one end of the push rod (33) is slidably connected to the limit plate (313).

9. The valve body structure of a marine stop check valve resistant to seawater corrosion according to claim 1, characterized in that, The cleaning assembly (4) includes a second gear (41), the outer surface of which is fixedly connected to the mounting rod (26). A fixed box (42) is fixedly connected to the top of the valve body (1). A third gear (43) is rotatably connected to the inner cavity of the fixed box (42), and the second gear (41) and the third gear (43) mesh with each other. A cleaning box (44) is fixedly connected to the top of the third gear (43), and a plurality of bristles (45) are fixedly connected to the inner cavity of the cleaning box (44).

10. The valve body structure of a marine stop check valve resistant to seawater corrosion according to claim 1, characterized in that, The top of the valve body (1) is rotatably connected to a threaded sleeve (12), and the inner cavity of the threaded sleeve (12) is threadedly connected to the valve stem (11).

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