Underwater hydraulic drive valve limit switch structure

Abstract

The application discloses a kind of underwater hydraulic drive valve limit switch structures, it is related to valve technical field, including the fixed sleeve pipe suitable for being connected in the hydraulic system underwater valve body drive pivot, rotationally connected in fixed sleeve pipe and with sealed induction cavity fixed shell, sealed connection in fixed shell inner cavity shell, fixed in fixed sleeve pipe and with the rotation shell of inner cavity shell, fixed in the outer magnetic assembly of rotation shell inside, rotationally connected in inner cavity shell and with the inner magnetic assembly of outer magnetic assembly magnetic force coupling, detachable upper cover is equipped on fixed shell, there is inductor fixed in inner magnetic assembly in induction cavity.Induction assembly is arranged in the sealed fixed shell isolated from hydraulic system, when approaching switch needs to be disassembled and maintained, only need to remove detachable upper cover on induction cavity, will not affect the air tightness of equipment, also need not to close the valve equipment associated with the hydraulic system, can be realized without stopping machine maintenance when overhauling and replacing.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to a limit switch structure for an underwater hydraulically driven valve. Background Technology

[0002] Submersible hydraulically driven valves are key equipment in marine engineering and underwater production systems, and the accurate detection and reliability of their valve positions are of paramount importance. Currently, the limit detection of this type of valve generally adopts a solution of directly mounting proximity switches at both ends of the hydraulically driven cylinder.

[0003] The aforementioned traditional method has significant drawbacks: First, when a proximity switch needs maintenance or replacement, the entire hydraulic system must be isolated and depressurized, causing all other valves and equipment associated with that system to malfunction, severely impacting operational efficiency and system availability. Second, during depressurization, if residual pressure within the cylinder is not completely eliminated, there is a risk of high-pressure oil spraying out when disassembling the sensor, posing a serious threat to the personal safety of operators. Furthermore, the traditional installation method exposes electrical components such as proximity switches near the cylinder, posing challenges to their sealing, interference resistance, and long-term reliability. Summary of the Invention

[0004] Therefore, the present invention aims to solve the problems of poor sealing and anti-interference ability of proximity switches installed near the hydraulic cylinder in the prior art, which affect the normal operation of other related valve equipment, work efficiency and normal system operation when maintenance or replacement is required, thereby providing an underwater hydraulic drive valve limit switch structure.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A limit switch structure for an underwater hydraulically driven valve includes: A fixed sleeve is used for installation on the drive shaft of an underwater valve body in a hydraulic system. A fixed outer shell is provided, and inside it is a sensing cavity and a transmission cavity located at the bottom of the sensing cavity, which are separated by a fixed partition. A detachable top cover is provided on the sensing cavity. The drive assembly is installed inside the transmission cavity and connected to the fixed sleeve; The sensing component is sealed within the sensing cavity and includes two proximity switches fixed within the sensing cavity and a sensor connected at one end to the driving component. The two proximity switches are located on one side of the sensor, and the driving component is adapted to drive the sensor to reciprocate toward the two proximity switches.

[0006] Furthermore, the driving component includes: The inner cavity housing is sealed within the transmission cavity; The rotating housing is fixedly connected to the fixed sleeve and is rotatably disposed within the transmission cavity; An external magnetic assembly is fixedly disposed inside the rotating housing and sleeved on the outer periphery of the inner cavity housing; An inner magnetic component is disposed within the inner cavity housing, with its first end magnetically coupled to the outer magnetic component and its second end extending into the sensing cavity and connected to the sensor.

[0007] Furthermore, the external magnetic assembly includes an outer cavity annular magnet fixedly connected to the inner wall of the rotating housing and sleeved on the outer periphery of the inner cavity housing; the internal magnetic assembly includes a rotating shaft rotatably connected to the inner cavity housing via a first bearing and an inner cavity annular magnet fixedly sleeved on the rotating shaft, the inner cavity annular magnet being located within the inner ring of the outer cavity annular magnet; the first end of the rotating shaft is disposed within the inner cavity housing, the second end is connected to the fixed partition via a second bearing and extends into the sensing cavity, and one end of the sensor is fixed to the second end of the rotating shaft.

[0008] Furthermore, the sensing cavity is provided with two limiting structures connected to the fixed partition. The limiting structures are respectively located outside the connecting line of the two proximity switches to limit the rotational displacement of the sensor. The length of the sensor is greater than the distance from the limiting structure to the axis of rotation.

[0009] Furthermore, the inner cavity shell is sealed to the bottom of the fixed partition, and a sealing structure is provided between the inner cavity shell and the fixed partition.

[0010] Furthermore, the rotating housing is rotatably mounted in the transmission cavity via a bushing, and a first end cap is fixedly connected to the end of the transmission cavity away from the sensing cavity. A first sealing element is provided between the inner wall of the first end cap and the outer wall of the rotating housing, and between the bushing and the first end cap.

[0011] Furthermore, the detachable top cover is a second end cover fixed to the top of the fixed housing, and a second sealing element is connected between the second end cover and the fixed housing.

[0012] Furthermore, it also includes a junction box sealed to the fixed housing, wherein a cable extending into the sensing cavity is disposed inside the junction box, and the cable is energized and has terminals electrically connected to the two proximity switches; the junction box includes a main housing fixedly connected to the fixed housing, a housing end cover sealed to the main housing, and an anti-pull-out sealing structure sealed to the housing end cover, wherein the cable passes sequentially through the housing end cover and the main housing from the anti-pull-out sealing structure and then extends into the interior of the fixed housing.

[0013] Furthermore, the end of the box cap away from the main box is sealed with an anti-pull-out sealing structure. The anti-pull-out sealing structure includes a sleeve and multiple conical retaining rings disposed inside the sleeve and fitted around the outer periphery of the cable. The diameter of the first end of the conical retaining ring facing the end cap is larger than the diameter of its second end. At least one clearance through hole is opened on the edge of the side wall of the second end of the conical retaining ring. A sealing rubber ring corresponding to the position of the clearance through hole is provided on the inner wall of the second end of the conical retaining ring. The second end of the conical retaining ring is fitted around the outer periphery of the first end of the adjacent conical retaining ring. A limit block is integrally formed on the inner wall of the first end of the sleeve. A locking member is internally threaded to the second end of the sleeve. A conical inner pressure ring is integrally formed on the end of the locking member that extends into the sleeve. Multiple conical retaining rings are disposed between the limit block and the conical inner pressure ring. The larger diameter end of the conical inner pressure ring is engaged with the outer periphery of the second end of a conical retaining ring near the conical inner pressure ring.

[0014] Furthermore, the first end of the sleeve is sealed to the end cap of the box body, a protective sleeve is fitted around the outer periphery of the sleeve, and a locking buckle is provided on one end of the protective sleeve connected to the outer periphery of the sleeve.

[0015] The technical solution of this invention has the following advantages: 1. The underwater hydraulic drive valve limit switch structure provided by this invention, when the underwater valve body drive shaft rotates, drives the fixed sleeve to rotate, the fixed sleeve drives the drive assembly to rotate, and the drive assembly drives the sensor to rotate. Only one end of the sensor is connected to the drive assembly, and the other end can reciprocate towards two proximity switches during rotation. When the valve rotates to fully open, the sensor moves to the side of one proximity switch in the open position, thus sending a "fully open" sensing signal. When the valve rotates to fully close, the sensor moves to the side of the other proximity switch in the closed position, thus sending a "fully closed" sensing signal. This method, by setting a sensing cavity within the fixed housing to seal the proximity switches, achieves sealed isolation of the sensing component relative to the hydraulic system, ensuring that the air pressure of the hydraulic system has no effect on the sensing component. Simultaneously, when the proximity switches need to be disassembled for maintenance, it has no impact on the sealing performance of the hydraulic system. While ensuring the sealing performance of the equipment, it also effectively guarantees anti-interference capability and long-term reliability of the equipment. When the proximity switch needs to be inspected or replaced, only the removable cover on the sensing chamber needs to be removed. This will not affect the airtightness of the equipment, nor is it necessary to close the valves associated with the hydraulic system. Maintenance and replacement can be carried out without shutting down the machine.

[0016] 2. The underwater hydraulic drive valve limit switch structure provided by the present invention includes an outer magnetic assembly comprising an outer annular magnet fixedly connected to the inner wall of a rotating housing and sleeved on the outer periphery of an inner cavity housing; an inner magnetic assembly comprising a rotating shaft rotatably connected to the inner cavity housing via a first bearing and an inner annular magnet fixedly sleeved on the rotating shaft, the inner annular magnet being located within the inner ring of the outer annular magnet; a first end of the rotating shaft being disposed within the inner cavity housing, and a second end being connected to a fixed partition via a second bearing and extending into the sensing cavity, with one end of the sensor fixed to the second end of the rotating shaft. With this configuration, the rotation of the rotating housing drives the outer annular magnet to rotate synchronously, thereby driving the inner annular magnet to rotate synchronously. The inner annular magnet drives the rotating shaft and the sensor on the rotating shaft to rotate synchronously, so that when the valve is fully open and fully closed, the sensor rotates to below the two proximity switches respectively and then emits "open to position" and "closed to position" signals respectively.

[0017] 3. The underwater hydraulic drive valve limit switch structure provided by this invention includes two limit structures connected to a fixed partition within the sensing chamber. These limit structures are respectively positioned outside the connecting line of the two proximity switches to limit the rotational displacement of the sensor. The length of the sensor is greater than the distance from the limit structure to the axis of rotation. This configuration allows the sensor to be stopped when it rotates to the bottom of the two proximity switches, restricting its range of motion within the space between the two limit structures and preventing damage to the internal mechanism due to excessive valve rotation.

[0018] 4. The underwater hydraulic drive valve limit switch structure provided by this invention features a rotating housing rotatably mounted within a transmission cavity via a bushing. A first end cap is fixedly connected to the end of the transmission cavity furthest from the sensing cavity. A first sealing element is provided between the inner wall of the first end cap and the outer wall of the rotating housing, and between the bushing and the first end cap. This configuration allows the bushing to provide auxiliary support and positioning for the rotating housing. When the valve shaft drives the rotating housing to rotate, the bushing provides stable radial support, preventing the rotating housing from swaying during rotation. The first sealing ring remains tightly attached to the rotating housing and bushing, forming a dynamic sealing barrier that effectively prevents external moisture or impurities from intruding into the inner cavity of the fixed housing from the front end.

[0019] 5. The underwater hydraulic drive valve limit switch structure provided by the present invention has a detachable top cover that is a second end cover fixed to the top of the fixed housing by a third locking member. A second sealing member is connected between the second end cover and the fixed housing. This configuration seals the static interface between the second end cover and the fixed housing through the second sealing member, thus forming a static sealing system. This completely isolates the sensing chamber inside the fixed housing from the external environment, ensuring its long-term stability and reliability in harsh underwater environments.

[0020] 6. The underwater hydraulic drive valve limit switch structure provided by the present invention has an anti-pull-out sealing structure at the end of the box end cover away from the main box body. The anti-pull-out sealing structure includes a sleeve and multiple conical retaining rings disposed inside the sleeve and fitted around the outer periphery of the cable. The diameter of the first end of the conical retaining ring facing the box end cover is larger than the diameter of its second end. At least one clearance through hole is opened on the edge of the side wall of the second end of the conical retaining ring. A sealing rubber ring corresponding to the position of the clearance through hole is provided on the inner wall of the second end of the conical retaining ring. The second end of the conical retaining ring is fitted around the outer periphery of the first end of the adjacent conical retaining ring. A limit block is integrally formed on the inner wall of the first end of the sleeve. A locking member is internally threaded to the second end of the sleeve. A conical inner pressure ring is integrally formed at the end of the locking member that extends into the sleeve. Multiple conical retaining rings are disposed between the limit block and the conical inner pressure ring. The end of the conical inner pressure ring with a larger diameter is engaged with the outer periphery of the second end of a conical retaining ring close to the conical inner pressure ring. This configuration allows for compression of multiple conical retaining rings by rotating the conical inner pressure ring and moving it towards the end cap of the housing. Simultaneously, the larger diameter first end of the conical retaining ring compresses the second end of the adjacent conical retaining ring. Since the second end of the conical retaining ring has a clearance through hole, it closes under compression, causing the conical surface structure at the second end of the conical retaining ring to radially contract, making its diameter smaller. This compression and gripping of the cable's outer wall provides strong anti-pull-out capability, ensuring that the cable will not be pulled out under water impact or accidental pulling, thus guaranteeing the continuity of the electrical connection. By setting a sealing ring on the inner side of each conical retaining ring, when the second end of the conical retaining ring is compressed, the sealing ring can expand and deform in the radial direction of the conical retaining ring, so that the conical retaining ring can tightly fit the cable sheath and the inner wall of the sleeve, forming multiple reliable radial sealing rings. The design of multiple sealing rings forms multiple redundant sealing barriers. Even if a single sealing ring fails, other sealing rings will still function, which greatly improves the reliability of the connected cable and is sufficient to cope with the high pressure challenge of deep water environment.

[0021] 7. The underwater hydraulic drive valve limit switch structure provided by this invention has a sleeve whose first end is sealed to the end cap of the housing. A protective sleeve is fitted around the outer periphery of the sleeve, and a locking buckle is provided on the outer periphery of one end of the protective sleeve connected to the sleeve. This design, by using a protective sleeve, prevents fatigue fracture of the internal metal of the cable due to excessive bending, thereby providing mechanical bending protection for the cable, optimizing the stress path of the cable, and dispersing the stress concentrated in the cable. By pressing the locking buckle against the outer periphery of the protective sleeve, the connection tightness between the protective sleeve and the sleeve can be improved, enhancing its sealing performance, and also enabling the clamping and sealing of the cable inside the protective sleeve. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A three-dimensional structural diagram of the underwater hydraulic drive valve limit switch structure provided by the present invention; Figure 2 This is a schematic diagram showing the connection relationship between the fixed outer shell and the junction box in this invention; Figure 3 An isometric sectional view of the underwater hydraulic drive valve limit switch structure provided by the present invention; Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 for Figure 3 Enlarged structural diagram at point B; Figure 6 A plan sectional view of the underwater hydraulic drive valve limit switch structure provided by the present invention; Figure 7 for Figure 6 Enlarged structural diagram at point C; Figure 8 for Figure 6 Enlarged structural diagram at point D; Figure 9 This is a three-dimensional structural diagram of the junction box in this invention; Figure 10 This is an isometric sectional view of the anti-pull-out sealing structure in this invention; Figure 11 This is a three-dimensional structural diagram of the conical retaining ring in this invention; Explanation of reference numerals in the attached drawings: 1. Fixed sleeve; 2. Rotating housing; 201. Outer cavity annular magnet; 3. Inner cavity housing; 301. Rotating shaft; 3011. First bearing; 3012. Second bearing; 302. Inner cavity annular magnet; 303. Sensor; 4. Fixed outer shell; 401. Main housing; 402. First end cap; 4021. First sealing ring; 403. Second end cap; 4031. Second sealing ring; 404. Bushing; 5. O-ring seal; 6. Support rod; 601. Copper support plate; 6 02. Proximity switch; 7. Limit rod; 8. Junction box; 801. Main box body; 802. Box end cover; 9. Cable; 901. Protective sleeve; 902. Locking buckle; 903. Anti-pull-out sealing structure; 9031. Sleeve; 9032. Sealing ring; 9033. Conical retaining ring; 9034. Clearance through hole; 904. Locking component; 9041. Conical inner pressure ring; 10. First locking component; 11. Second locking component; 12. Third locking component; 13. Terminal block; 14. Fourth locking component. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figures 1-11 The underwater hydraulic drive valve limit switch structure shown includes a fixed sleeve 1, a rotating housing 2, a fixed outer shell 4, an inner magnetic component, and a sensing component. Specifically, the fixed sleeve 1 is used to install on the underwater valve body drive shaft of the hydraulic system; the rotating housing 2 is fixedly connected to the fixed sleeve 1, and an outer magnetic component is fixed inside the rotating housing 2; the fixed outer shell 4 is divided by a fixed partition into a sensing cavity and a transmission cavity located at the bottom of the sensing cavity, the rotating housing 2 is rotatably installed in the transmission cavity, a detachable top cover is provided on the sensing cavity, and an inner cavity housing 3 is sealed inside the transmission cavity; the first end of the inner magnetic component is sealed inside the transmission cavity through the inner cavity housing 3, and the second end extends into the sensing cavity, the first end of the inner magnetic component is magnetically coupled to the outer magnetic component; the sensing component is located inside the sensing cavity and includes two proximity switches 602 fixed inside the sensing cavity and a sensor 303 with one end connected to the second end of the inner magnetic component, the two proximity switches 602 are located on top of the sensor 303, and the inner magnetic component is adapted to drive the sensor 303 to reciprocate at the bottom of the two proximity switches 602.

[0029] This underwater hydraulically driven valve limit switch structure works as follows: when the underwater valve body's drive shaft rotates, it drives the fixed sleeve 1 to rotate. The fixed sleeve 1 then drives the outer magnetic component fixed inside it to rotate. The outer magnetic component's magnetic force drives the inner magnetic component, which is magnetically coupled to it, to rotate. The inner magnetic component then drives the sensor 303 to rotate. Only one end of the sensor 303 is connected to the inner magnetic component; the other end can reciprocate at the bottom of the two proximity switches 602 during rotation. When the valve rotates to fully open, the sensor 303 moves below one of the proximity switches 602 in the open position, thus sending a "fully open" sensing signal. When the valve rotates to fully close, the sensor 303 moves below the other proximity switch 602 in the closed position, thus sending a "fully open" sensing signal. It sends a "closed" sensing signal; this setting, which uses magnetic force to drive the inductive switch to the correct position, seals the sensing cavity through the fixed outer shell 4 and the inner cavity shell 3, achieving sealed isolation between the sensing component and the hydraulic system. This ensures that the air pressure of the hydraulic system has no effect on the sensing component. At the same time, when the proximity switch 602 needs to be disassembled for maintenance, it also has no impact on the sealing of the hydraulic system. While ensuring the sealing of the equipment, it also effectively guarantees anti-interference capability and long-term reliability of the equipment. When the proximity switch 602 needs to be inspected or replaced, only the removable cover on the sensing cavity needs to be removed. This will not affect the airtightness of the equipment, nor is it necessary to close the valves associated with the hydraulic system. Maintenance and replacement can be carried out without shutting down the machine.

[0030] In this embodiment, as Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the outer magnetic assembly includes an outer cavity annular magnet 201 fixedly connected to the inner wall of the rotating housing 2 and sleeved on the outer periphery of the inner cavity housing 3; the inner magnetic assembly includes a rotating shaft 301 rotatably connected to the inner cavity housing 3 via a first bearing 3011 and an inner cavity annular magnet 302 fixedly sleeved on the rotating shaft 301, the inner cavity annular magnet 302 being located in the inner ring of the outer cavity annular magnet 201; the first end of the rotating shaft 301 is disposed in the inner cavity housing 3, the second end is connected to a fixed partition via a second bearing 3012 and extends into the sensing cavity, and one end of the sensor 303 is fixed to the second end of the rotating shaft 301. With this configuration, the rotation of the rotating housing 2 drives the outer cavity annular magnet 201 to rotate synchronously, which in turn drives the inner cavity annular magnet 302 to rotate synchronously. The inner cavity annular magnet 302 drives the rotating shaft 301 and the sensor 303 on the rotating shaft 301 to rotate synchronously, so that when the valve is fully open and fully closed, the sensor 303 rotates to the position below the two proximity switches 602 respectively and sends out "open" and "closed" signals respectively.

[0031] In this embodiment, as Figure 3 , Figure 4 As shown, the sensing cavity is equipped with two limiting structures connected to a fixed partition. These limiting structures are respectively positioned outside the connecting line of the two proximity switches 602. The length of the sensor 303 is greater than the distance from the limiting structure to the axis of the rotating shaft 301. This configuration allows the sensor 303 to be stopped when it rotates to the bottom of the two proximity switches 602 by the two limiting structures, restricting its range of motion within the two limiting structures and preventing damage to the internal mechanism due to over-rotation of the valve.

[0032] In this embodiment, as Figure 3 , Figure 4 As shown, specifically, a copper support plate 601 is connected to the fixed partition via three support rods 6. Two proximity switches 602 are respectively arranged on two 90-degree vertical lines extending along the axis of the rotating shaft 301 and mounted on the copper support plate 601. Two limiting structures are also respectively arranged on the two vertical lines and located outside the two proximity switches 602. Specifically, the fixed housing 4 is a cylindrical main housing 401, and the diameter of the first end of the main housing 401 with the sensing cavity is larger than the diameter of the second end with the transmission cavity. Specifically, the two proximity switches 602 are mounted on the copper support plate 601 by locking components. The limiting structure is a limiting rod 7 fixed to the fixed partition. The rotating shaft 301 is a stainless steel rotating shaft 301, and the sensor 303 is a square sensing iron piece, one end of which is fixed to the second end of the stainless steel rotating shaft 301.

[0033] In this embodiment, as Figure 3 , Figure 6As shown, the inner cavity housing 3 is connected to the bottom of the fixed partition via the first locking member 10, and a sealing structure is provided between the inner cavity housing 3 and the fixed partition; specifically, the first locking member 10 is a locking screw, and the sealing structure is an O-ring seal 5. With this configuration, the static interface between the inner cavity housing 3 and the fixed outer shell 4 is sealed by the sealing ring.

[0034] In this embodiment, as Figure 7 , Figure 8 As shown, the rotating housing 2 is rotatably mounted in the transmission cavity via a bushing 404. A first end cap 402 is mounted on the end of the transmission cavity furthest from the sensing cavity via a second locking member 11. A first sealing element is provided between the inner wall of the first end cap 402 and the outer wall of the rotating housing 2, and between the bushing 404 and the first end cap 402. Specifically, the second locking member 11 is a locking screw; the first sealing element is a first sealing ring 4021. This configuration allows the bushing 404 to provide auxiliary support and positioning for the rotating housing 2. When the valve shaft 301 drives the rotating housing 2 to rotate, the bushing 404 provides stable radial support, preventing the rotating housing 2 from swaying during rotation. The first sealing ring 4021 remains tightly attached to the rotating housing 2 and the bushing 404, forming a dynamic sealing barrier that effectively prevents external moisture or impurities from entering the inner cavity of the fixed housing 4 from the front end.

[0035] Specifically, a lubricant is filled between the bushing 404 and the rotating housing 2. This arrangement allows the lubricant to form a lubricating film in the gap between the bushing 404 and the rotating housing 2, which can reduce wear and ensure smooth rotation of the rotating housing 2. The lubricating film can minimize wear, thereby ensuring smooth operation over a long period of time.

[0036] In this embodiment, as Figure 7 As shown, the detachable top cover is a second end cover 403 fixed to the top of the fixed housing 4 by a third locking member 12. A second sealing member connects the second end cover 403 and the fixed housing 4. Specifically, the third locking member 12 is a locking screw, and the second sealing member is a second sealing ring 4031. With this configuration, the static interface between the second end cover 403 and the fixed housing 4 is sealed by the second sealing ring 4031, thus forming a static sealing system. This system can completely isolate the sensing cavity inside the fixed housing 4 from the external environment, ensuring its long-term stability and reliability in harsh underwater environments.

[0037] In this embodiment, as Figure 9 , Figure 10As shown, it also includes a junction box 8 sealed to the fixed housing 4. A cable 9 extending into the sensing cavity is provided inside the junction box 8. The cable 9 is electrically connected to terminals 13 electrically connected to two proximity switches 602. The junction box 8 includes a main box body 801 fixedly connected to the fixed housing 4, a box end cover 802 sealed to the main box body 801, and an anti-pull-out sealing structure 903 sealed to the box end cover 802. The cable 9 passes through the box end cover 802 and the main box body 801 in sequence from the anti-pull-out sealing structure 903 and then extends into the interior of the fixed housing 4.

[0038] Specifically, a sealant is provided between the main box 801 and the fixed outer shell 4. This design effectively ensures a static seal between the junction box 8 and the fixed outer shell 4, forming a permanent static seal between them. This seal is reliable, durable, and effectively resists water pressure.

[0039] Specifically, the main housing 801 is detachably connected to the end cover 802 via multiple fourth locking elements 14, and a third sealing ring is provided between the main housing 801 and the end cover 802. This configuration allows for a detachable static seal between the main housing 801 and the end cover 802 through the third sealing ring. When wiring or inspection of the internal terminals 13 of the junction box 8 is required, simply loosen the third locking element 12 and open the end cover 802. This operation does not damage the permanent seal formed by the sealant between the main housing 801 and the fixed outer shell 4, effectively improving the environmental adaptability, long-term reliability, and engineering practicality of the entire limit switch assembly.

[0040] In this embodiment, as Figure 10 , Figure 11As shown, the end of the box cap 802 away from the main box 801 is sealed with an anti-pull-out sealing structure 903. The anti-pull-out sealing structure 903 includes a sleeve 9031 and a plurality of conical retaining rings 9033 disposed inside the sleeve 9031 and fitted around the outer periphery of the cable 9. The diameter of the first end of the conical retaining ring 9033 facing the end cap 802 is larger than the diameter of its second end. At least one clearance through hole 9034 is opened on the edge of the side wall of the second end of the conical retaining ring 9033. A sealing rubber ring 9 is provided on the inner wall of the second end of the conical retaining ring 9033, which corresponds to the position of the clearance through hole 9034. 032, the second end of the conical retaining ring 9033 is sleeved on the outer periphery of the first end of the adjacent conical retaining ring 9033; the inner wall of the first end of the sleeve 9031 is integrally formed with a limiting block, the second end of the sleeve 9031 is internally threaded with a locking member 904, the end of the locking member 904 extending into the sleeve 9031 is integrally formed with a conical inner pressure ring 9041, a plurality of conical retaining rings 9033 are disposed between the limiting block and the conical inner pressure ring 9041, the end of the conical inner pressure ring 9041 with a larger diameter is engaged with the outer periphery of the second end of a conical retaining ring 9033 near the conical inner pressure ring 9041. With this configuration, by rotating the conical inner pressure ring 9041 and moving it toward the end cap 802 of the housing, multiple conical retaining rings 9033 can be compressed. At the same time, among the multiple conical retaining rings 9033, the first end of the conical retaining ring 9033 with a larger diameter will compress the second end of the adjacent conical retaining ring 9033. Since the second end of the conical retaining ring 9033 has a clearance through hole 9034, under the compression action, the clearance through hole 9034 will close, thereby causing the conical surface structure of the second end of the conical retaining ring 9033 to undergo radial contraction, making its second end diameter smaller. This can compress and tighten the outer wall of the cable 9, providing the cable 9 with a strong anti-pull-out capability, ensuring that the cable 9 will not be pulled out under water impact or accidental pulling, thus ensuring the continuity of electrical connection. By providing a sealing ring 9032 inside each conical retaining ring 9033, when the second end of the conical retaining ring 9033 is compressed, the sealing ring 9032 can expand and deform in the radial direction of the conical retaining ring 9033, so that the conical retaining ring 9033 can tightly fit the outer sheath of the cable 9 and the inner wall of the sleeve 9031, forming multiple reliable radial sealing rings. The design of multiple sealing rings 9032 forms multiple redundant sealing barriers. Even if a single sealing ring 9032 fails, other sealing rings 9032 will still function, greatly improving the reliability of the connecting cable 9, which is sufficient to cope with the high pressure challenge of deep water environment.

[0041] In this embodiment, as Figure 9 , Figure 10As shown, the first end of the sleeve 9031 is sealed to the end cap 802 of the housing. A protective sleeve 901 is fitted around the outer periphery of the sleeve 9031, and a locking buckle 902 is provided on the outer periphery of one end of the protective sleeve 901 connected to the sleeve 9031. This design, by using a protective sleeve, prevents fatigue fracture of the internal metal of the cable due to excessive bending, thus providing mechanical bending protection for the cable, optimizing the stress path of the cable, and dispersing the stress concentrated on the cable. By pressing the locking buckle 902 against the outer periphery of the protective sleeve 901, the connection tightness between the protective sleeve 901 and the sleeve 9031 is improved, enhancing its sealing performance, and also enabling the clamping and sealing of the cable 9 inside the protective sleeve 901. Specifically, the protective sleeve 901 has a multi-layered composite elastic structure, which provides superior flexibility and buffering performance, offering reliable protection for the internal cable 9.

[0042] A method of using the above-mentioned limit switch structure for an underwater hydraulically driven valve includes the following steps: S1: Installation and Fixing: The fixing sleeve 1 of the limit switch assembly is fitted onto the drive shaft of the underwater valve body. The initial installation angle is adjusted to ensure that the sensor 303 can accurately trigger the corresponding proximity switch 602 when the valve is fully open and fully closed. Then, the locking device is used to firmly fix it. At the same time, the fixing housing 4 is reliably fixed to the valve body or nearby base by the bracket to ensure that the fixing housing 4 remains stable and stationary during operation. S2: Cable 9 connection and sealing: Open the end cover 802 of the box, connect the core of the cable 9 to the terminal 13 inside the junction box 8, then pass the cable 9 through the anti-pull-out sealing structure 903, and then tighten the locking part 904 to push the conical inner pressure ring 9041 to squeeze the internal conical retaining ring 9033 and multiple sealing rubber rings 9032 to achieve radial sealing and axial anti-pull-out of the cable 9; A cable 9 protective sleeve 901 is fitted over the outside of the cable 9, and the external locking buckle 902 is tightened to provide additional mechanical protection; Close the end cover 802 of the box body, ensure that the third sealing ring is in place, and lock it with the fourth locking piece 14. The junction box 8 and the fixed housing 4 are filled with sealant to form a multiple static seal. S3: Operation and Signal Feedback: When the underwater hydraulic drive valve is opened or closed, its drive shaft drives the rotating part of the entire limit switch assembly, namely the rotating housing 2 and the outer cavity annular magnet 201, to rotate. Through magnetic coupling, the inner cavity annular magnet 302, the shaft 301 and the sensor 303 rotate synchronously. When the valve is rotated to the fully open position, the sensor 303 enters the sensing area of ​​the "open" proximity switch 602 and sends a "fully open" signal. When the valve is rotated to the fully closed position, the sensor 303 enters the sensing area of ​​the "closed" proximity switch 602 and sends a "closed in place" signal. These two signals are transmitted to the control room via cable 9 to enable remote monitoring of the valve position; S4: Maintenance and Replacement When one of the proximity switches 602 needs to be replaced, no operation of the hydraulic system is required. Simply open the second end cover 403 of the fixed housing 4, disconnect the cable 9 of the old switch, and the proximity switch 602 can be taken out from the fixed housing 4. Then, the new proximity switch 602 is installed, the wiring is connected, and the seal is restored. The whole process is quick and safe and does not affect the normal operation of the hydraulic system and other valves.

[0043] In summary, this underwater hydraulically driven valve limit switch structure, when the underwater valve body's drive shaft rotates, drives the fixed sleeve 1 to rotate. The fixed sleeve 1 drives the outer magnetic component fixed inside it to rotate. The outer magnetic component's magnetic force drives the inner magnetic component, which is magnetically coupled to it, to rotate. The inner magnetic component then drives the sensor 303 to rotate. Only one end of the sensor 303 is connected to the inner magnetic component, while the other end can reciprocate at the bottom of the two proximity switches 602 during rotation. When the valve rotates to the fully open position, the sensor 303 moves below one of the proximity switches 602 in the open position, thus sending a "fully open" sensing signal. When the valve rotates to the fully closed position, the sensor 303 moves below the other proximity switch 602 in the closed position. This sends a "closed" sensing signal. This magnetically driven sensing switch moves to the correct position, and the sensing chamber is sealed by the fixed outer shell 4 and the inner cavity shell 3, achieving a sealed isolation between the sensing component and the hydraulic system. This ensures that the air pressure of the hydraulic system has no effect on the sensing component. At the same time, when the proximity switch 602 needs to be disassembled for maintenance, it also has no impact on the sealing of the hydraulic system. This balances the sealing performance of the equipment with the effective guarantee of anti-interference capability and long-term reliability. When the proximity switch 602 needs to be inspected or replaced, only the removable top cover on the sensing chamber needs to be removed. This does not affect the airtightness of the equipment, nor does it require closing the valves associated with the hydraulic system. Maintenance and replacement can be carried out without shutting down the machine.

[0044] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A limit switch structure for an underwater hydraulically driven valve, characterized in that, include: Fixed sleeve (1) is used to be installed on the underwater valve body drive shaft of the hydraulic system; The fixed outer shell (4) has a sensing cavity and a transmission cavity located at the bottom of the sensing cavity separated by a fixed partition. The sensing cavity is provided with a detachable top cover. The drive assembly is installed in the transmission cavity and connected to the fixed sleeve (1); The sensing component is sealed inside the sensing cavity and includes two proximity switches (602) fixed inside the sensing cavity and a sensor (303) connected at one end to the driving component. The two proximity switches (602) are located on one side of the sensor (303). The driving component is adapted to drive the sensor (303) to reciprocate toward the two proximity switches (602).

2. The underwater hydraulic drive valve limit switch structure according to claim 1, characterized in that, The driving component includes: The inner cavity housing (3) is sealed within the transmission cavity; The rotating housing (2) is fixedly connected to the fixed sleeve (1) and is rotatably disposed in the transmission cavity; An external magnetic assembly is fixedly disposed inside the rotating housing (2) and sleeved on the outer periphery of the inner cavity housing (3); An inner magnetic component is disposed within the inner cavity housing (3), with its first end magnetically coupled to the outer magnetic component and its second end extending into the sensing cavity and connected to the sensor (303).

3. The underwater hydraulic drive valve limit switch structure according to claim 2, characterized in that, The external magnetic assembly includes an outer cavity annular magnet (201) fixedly connected to the inner wall of the rotating housing (2) and sleeved on the outer periphery of the inner cavity housing (3); the internal magnetic assembly includes a rotating shaft (301) rotatably connected to the inner cavity housing (3) via a first bearing (3011) and an inner cavity annular magnet (302) fixedly sleeved on the rotating shaft (301), the inner cavity annular magnet (302) being located in the inner ring of the outer cavity annular magnet (201); the first end of the rotating shaft (301) is disposed in the inner cavity housing (3), the second end is connected to the fixed partition via a second bearing (3012) and extends into the sensing cavity, and one end of the sensor (303) is fixed to the second end of the rotating shaft (301).

4. The underwater hydraulic drive valve limit switch structure according to claim 3, characterized in that, The sensing cavity is provided with two limiting structures connected to the fixed partition. The limiting structures are respectively located on the outside of the two proximity switches (602) to limit the rotational displacement of the sensor. The length of the sensor (303) is greater than the distance from the limiting structure to the axis of the rotating shaft (301).

5. The underwater hydraulic drive valve limit switch structure according to claim 2, characterized in that, The inner cavity shell (3) is sealed to the bottom of the fixed partition, and a sealing structure is provided between the inner cavity shell (3) and the fixed partition.

6. The underwater hydraulic drive valve limit switch structure according to claim 2, characterized in that, The rotating housing (2) is rotatably mounted in the transmission cavity via a bushing (404). A first end cap (402) is fixedly connected to one end of the transmission cavity away from the sensing cavity. A first sealing element is provided between the inner wall of the first end cap (402) and the outer wall of the rotating housing (2) and between the bushing (404) and the first end cap (402).

7. The underwater hydraulically driven valve limit switch structure according to claim 2, characterized in that, The detachable top cover is a second end cover (403) fixed to the top of the fixed housing (4), and a second sealing element is connected between the second end cover (403) and the fixed housing (4).

8. The underwater hydraulically driven valve limit switch structure according to any one of claims 2-7, characterized in that, It also includes a junction box (8) sealed to the fixed housing (4), and a cable (9) extending into the sensing cavity is provided in the junction box (8). The cable (9) is electrically connected to the terminals (13) of the two proximity switches (602). The junction box (8) includes a main box body (801) fixedly connected to the fixed housing (4), a box end cover (802) sealed to the main box body (801), and an anti-pull-out sealing structure (903) sealed to the box end cover (802). The cable (9) passes through the box end cover (802) and the main box body (801) in sequence from the anti-pull-out sealing structure (903) and then extends into the fixed housing (4).

9. The underwater hydraulic drive valve limit switch structure according to claim 8, characterized in that, The anti-pull-out sealing structure (903) includes a sleeve (9031) and a plurality of conical retaining rings (9033) disposed inside the sleeve (9031) and fitted around the outer periphery of the cable (9). The diameter of the first end of the conical retaining ring (9033) facing the end cap (802) of the housing is larger than the diameter of its second end. At least one clearance through hole (9034) is provided on the edge of the side wall of the second end of the conical retaining ring (9033). A sealing ring (9032) corresponding to the position of the clearance through hole (9034) is provided on the inner wall of the second end of the conical retaining ring (9033). The second end of the conical retaining ring (9033) is fitted with a sleeve. A limiting block is integrally formed on the inner wall of the first end of the sleeve (9031), and a locking member (904) is internally threaded to the second end of the sleeve (9031). A conical inner pressure ring (9041) is integrally formed on one end of the locking member (9041) that extends into the sleeve (9031). A plurality of conical retaining rings (9033) are disposed between the limiting block and the conical inner pressure ring (9041). The end of the conical inner pressure ring (9041) with a larger diameter is engaged with the outer periphery of the second end of a conical retaining ring (9033) near the conical inner pressure ring (9041).

10. The underwater hydraulically driven valve limit switch structure according to claim 9, characterized in that, The first end of the sleeve (9031) is sealed to the end cap (802) of the box body. A protective sleeve (901) is provided on the outer periphery of the sleeve (9031). A locking buckle (902) is provided on the outer periphery of one end of the protective sleeve (901) connected to the sleeve (9031).

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