A one-way stop valve set for submersible buoyancy adjustment and method of use thereof

Abstract

The application relates to a one-way stop valve group for submersible buoyancy adjustment and a use method thereof, which comprises a valve body, an upper and lower through central hole is arranged on the valve body, the central hole is sequentially laterally extended with a through water outlet, a water inlet and an oil return port from top to bottom along the axial direction; a one-way valve assembly is arranged at the water inlet, a main valve seat is fixedly arranged in the central hole between the water inlet and the water outlet, a main valve core is arranged above the main valve seat, the main valve core is separated from the main valve seat under the push of a top driving rod, and the water inlet and the water outlet are separated in the central hole; a driving rod is further arranged in the central hole below the main valve seat, the driving rod goes up under the push of oil liquid at the bottom, passes through the main valve seat and applies upward force to the main valve core, so that the main valve core is separated from the main valve seat, water entering the water inlet through the one-way valve assembly can flow out from the water outlet after passing through the main valve seat upwards, and buoyancy adjustment is assisted to be realized; the one-way stop valve has the performance of a safety valve, the whole has good sealing property and high reliability.

Description

Technical Field

[0001] This invention relates to the field of submersible auxiliary facilities technology, and in particular to a one-way shut-off valve assembly for submersible buoyancy adjustment and its usage method. Background Technology

[0002] Submersibles are important diving equipment for underwater exploration and operations. They can be mainly divided into two types: manned and unmanned, and are used for tasks such as underwater exploration, marine resource development, and underwater rescue.

[0003] Submersibles need to dive into the ocean to perform operational tasks, and then surface and be recovered after the task is completed. During underwater operations, submersibles need to actively adjust their own weight or buoyancy to meet the requirements of the specific operating depth. Furthermore, changes in the submersible's weight or buoyancy, caused by underwater sampling, water absorption by buoyancy materials, and changes in seawater density, also require the buoyancy adjustment system to fine-tune the submersible's position at sea depth.

[0004] Typically, when a submersible descends, its own weight exceeds its buoyancy, allowing for unpowered descent. When surfacing, a specialized jettisoning device is needed to discard its buoyancy load, reducing underwater weight to less than buoyancy and allowing the submersible to rise to the surface. During underwater operations, submersibles actively control their depth by adjusting their own weight through seawater pumps, shut-off valves, and ballast tanks to facilitate deep-sea exploration and operations. The shut-off valves, controlling the connection between the ballast tanks and the external marine environment, are crucial components of the buoyancy control system; their sealing performance significantly impacts the operational reliability of the submersible.

[0005] In existing technologies, submersibles need to jettison heavy objects and use specialized jettisoning devices when surfacing, resulting in resource waste and high costs. Furthermore, existing buoyancy control valve assemblies consist of multiple interconnected control valves, leading to complex structures. The hydraulic shut-off valves, in particular, require high precision in the machining of their valve cores and seats, as well as high sealing pressure, to ensure a tight seal. Moreover, the hydraulic control oil in the hydraulic shut-off valves used for buoyancy adjustment in existing technologies is prone to leaking into the buoyancy tank, causing environmental pollution. Summary of the Invention

[0006] In response to the shortcomings of the existing production technology, the applicant provides a reasonably structured one-way shut-off valve assembly for buoyancy adjustment of submersibles and its usage method, which greatly simplifies the valve assembly structure, while also having the performance of a safety valve. The overall sealing performance is good and the reliability is high.

[0007] The technical solution adopted in this invention is as follows:

[0008] A one-way stop valve group for submersible buoyancy adjustment, comprising a valve body, a center hole is formed in the valve body, the center hole extends laterally from top to bottom along the axial direction, and a water outlet, a water inlet and an oil return port are sequentially arranged in the center hole; a one-way valve assembly is arranged at the water inlet, a main valve seat is fixedly arranged in the center hole between the water inlet and the water outlet, a main valve core is arranged above the main valve seat, and the main valve core is separated from the main valve seat below to separate the water inlet from the water outlet in the center hole under the push of a top driving rod; a driving rod is also arranged in the center hole below the main valve seat, and the driving rod goes up to apply an upward force to the main valve core through the main valve seat under the push of oil at the bottom.

[0009] As a further improvement of the above technical solution:

[0010] The lower end of the main valve core is arranged as a conical surface in the circumferential direction, the center of the main valve seat is arranged as a conical hole with the same angle as the conical surface, the main valve core is lowered to fit the main valve seat, and the upper and lower double-layer seals along the circumferential direction are formed.

[0011] The outer wall surface of the main valve core above the conical surface is outwardly convex to form a boss along the circumferential direction, the boss bottom surface is fitted with the main valve seat top surface when the main valve core is downwardly fitted with the main valve seat, and a flat plate seal is formed; a dovetail groove for accommodating a sealing ring is formed in the conical hole of the main valve seat along the circumferential direction downwardly, and the second seal when the main valve core is fitted is formed by the sealing ring; and the upper edge of the dovetail groove is arranged as a round corner step at the joint with the conical hole.

[0012] The top end of the driving rod is arranged with a space for accommodating liquid at the joint with the main valve core.

[0013] A valve core cover is fixedly arranged in the center hole above the main valve seat, the space for the main valve core to move up and down is formed by the opening below the valve core cover, and the side wall opening of the valve core cover is communicated with the water outlet; an inner step is arranged on the inner wall surface of the center hole, and the bottom surface of the valve core cover is abutted with the top surface of the inner step; a sealing sleeve one is sealingly arranged on the inner wall surface of the center hole above the valve core cover, and an end cover is threadedly arranged at the hole opening of the center hole above the sealing sleeve one, so that the sealing sleeve one and the valve core cover below are pressed downwardly on the inner step by the end cover.

[0014] A large elastic body is arranged at one end of the driving rod above the sealing sleeve one and is jointly arranged with the end cover, and the other end of the driving rod is sequentially passed through the sealing sleeve one and the valve core cover downwardly and is connected with the top of the main valve core, and the end cover is communicated to form an outer communication port.

[0015] The valve sleeve is fixedly installed in the central hole below the main valve seat, and the water inlet penetrates the valve sleeve laterally; the top of the valve sleeve penetrates the main valve seat upward after the main valve core is separated from the main valve seat; the sealing sleeve two is sealingly installed on the inner wall surface of the central hole below the valve sleeve, and the bushing is installed in the central hole below the sealing sleeve two; one end of the driving rod is sealingly installed in the inner side of the bushing, and the other end of the driving rod penetrates the sealing sleeve two and the valve sleeve in sequence and then is directed to the bottom of the main valve core; the liquid containing cavity is formed between the driving rod below the sealing sleeve two and the bushing, and the liquid containing cavity is communicated with the oil return port through the damping hole penetrating the bushing; the oil return port is communicated to the oil return path of the external oil pressure source or an external oil tank, and the liquid containing cavity is filled with oil.

[0016] The sealing ring is press-fitted between the outer wall surface of the bushing and the inner wall surface of the central hole; the screw plug is threadedly installed at the lower opening of the central hole, and the bushing, the sealing sleeve two and the valve sleeve above the screw plug are pressed tightly on the bottom surface of the main valve seat by the screw plug; the screw plug penetrates axially to form the control oil port, and the control oil port is connected with the pressure supply port of the external oil pressure source; the oil entering the control oil port exerts an upward force on the bottom end of the driving rod to drive the driving rod to move upward.

[0017] Further comprising a buoyancy tank, the buoyancy tank is communicated to the one-way valve assembly through a pipeline, a pump is installed in series on the pipeline, and under the action of the pump, the water in the buoyancy tank flows out through the one-way check valve group; the buoyancy tank is further provided with a water inlet valve through a pipeline.

[0018] A use method of the one-way check valve group for buoyancy adjustment of a submersible vehicle, comprising the following steps:

[0019] When the buoyancy tank needs to float up and reduce the internal water volume, the pump works;

[0020] The water in the buoyancy tank enters the central hole through the one-way valve assembly at the water inlet, and exerts a force on the main valve core to move upward and separate from the main valve seat;

[0021] At the same time, the oil pushes the driving rod to move upward, and the driving rod pushes the main valve core upward to make it separate from the main valve seat;

[0022] The water in the central hole flows out from the water outlet after passing through the main valve seat;

[0023] The water volume in the buoyancy tank is discharged, the weight is reduced, and the buoyancy tank floats up.

[0024] The beneficial effects of the present application are as follows:

[0025] The present application has the advantages of compact and reasonable structure, convenient use, integration of the one-way valve and the check valve in the same valve body to form a one-way check valve group, high overall integration, greatly simplified valve group structure for buoyancy adjustment, safety valve performance, good sealing property and high reliability;

[0026] The application also comprises the following advantages:

[0027] The liquid control stop valve composed of the driving rod, the driven rod, the main valve core, the main valve seat and the like effectively ensures the sealing performance at the one-way valve assembly, the one-way valve assembly is arranged to effectively avoid the liquid leakage problem of the liquid control stop valve, thereby effectively ensuring the reliability during use, and solving the liquid leakage and the water tank environmental pollution problem caused by the liquid leakage;

[0028] The double-layer sealing between the main valve core and the main valve seat effectively ensures the reliability of the sealing, and the coaxiality and the like requirements for machining are lower, facilitating machining and assembly. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic view of the application.

[0030] Figure 2 It is a structural schematic view of the valve body of the application.

[0031] Figure 3 It is a structural schematic view of the main valve seat of the application.

[0032] Figure 4 It is a structural schematic view of the main valve core of the application.

[0033] Figure 5 It is a structural schematic view of the bushing of the application.

[0034] 1, valve body; 2, one-way valve assembly; 3, driven rod; 4, valve core cover; 5, main valve core; 6, main valve seat; 7, valve sleeve; 8, driving rod; 9, screw plug; 10, pump; 20, buoyancy water tank; 30, water inlet valve;

[0035] 11, water inlet; 12, water outlet; 13, oil return port; 14, control oil port; 15, outer through port; 16, center hole; 17, inner step; 18, convex ring;

[0036] 21, small elastic body; 22, side valve core; 23, side valve seat;

[0037] 31, large elastic body; 32, end cover; 33, sealing sleeve one;

[0038] 51, groove one; 52, convex platform; 53, sealing groove; 54, groove two;

[0039] 61, metal seat; 62, plastic inner lining; 63, round corner step; 64, dovetail groove;

[0040] 81, sealing sleeve two; 82, bushing; 821, damping hole. DETAILED DESCRIPTION

[0041] The specific embodiments of the present application are described below with reference to the accompanying drawings.

[0042] As shown in Figure 1 and Figure 2 , the one-way stop valve group for the submersible buoyancy adjustment of the present embodiment comprises a valve body 1, the valve body 1 is provided with a center hole 16 extending through from top to bottom, the center hole 16 is provided with a water outlet 12, a water inlet 11 and an oil return port 13 extending laterally from top to bottom along the axial direction in sequence; a one-way valve assembly 2 is arranged at the water inlet 11, a main valve seat 6 is fixed in the center hole 16 between the water inlet 11 and the water outlet 12, a main valve core 5 is arranged above the main valve seat 6, the main valve core 5 is separated from the main valve seat 6 in the center hole 16 under the push of a top follower 3, and the water inlet 11 is separated from the water outlet 12; a driving rod 8 is also arranged in the center hole 16 below the main valve seat 6, the driving rod 8 goes up to apply an upward force to the main valve core 5 through the main valve seat 6 under the push of the oil at the bottom.

[0043] In the present embodiment, the one-way valve and the stop valve are integrated in the same valve body 1 to form a one-way stop valve group, which has high overall integration and greatly simplifies the structure of the valve group for buoyancy adjustment.

[0044] In the present embodiment, the liquid control stop valve composed of the driving rod 8, the follower 3, the main valve core 5 and the main valve seat 6 effectively ensures the sealing performance of the one-way valve assembly 2, the arrangement of the one-way valve assembly 2 effectively avoids the liquid leakage problem of the liquid control stop valve, thereby effectively ensuring the reliability in use and solving the problem of water tank environmental pollution caused by liquid leakage.

[0045] Further, in order to ensure the sealing performance of the main valve core 5 and the main valve seat 6, when the main valve core 5 is lowered to be attached to the main valve seat 6, a double-layer sealing along the circumferential direction is formed;

[0046] In the present embodiment, a double-layer sealing is arranged at the position where the main valve core 5 and the main valve seat 6 are attached to each other to ensure the reliable sealing of the structure, specifically:

[0047] As shown in Figure 4 , the outer wall surface of the main valve core 5 above the conical surface is outwardly protruded in the circumferential direction to form a boss 52, when the main valve core 5 is attached to the main valve seat 6, the bottom surface of the boss 52 is attached to the top surface of the main valve seat 6 to form a flat sealing;

[0048] Of course, the sealing performance between the bottom surface of the boss 52 and the top surface of the main valve seat 6 can be further ensured by the arrangement of end face ring, press-fitting sealing ring and other structures; for example, a sealing groove 53 is arranged along the circumferential direction at the bottom surface of the boss 52, and a sealing device is press-fitted in the sealing groove 53 to be attached to the top surface of the main valve seat 6 below.

[0049] In addition, as shown in Figure 3 and Figure 4As shown, the lower end of the main valve core 5 is provided with a tapered surface in the circumferential direction, and the center of the main valve seat 6 is provided with a tapered hole with the same angle as the tapered surface. When the main valve core 5 is attached to the main valve seat 6, the tapered surface is attached to the tapered hole. A sealing ring is jointly pressed between the tapered surface and the tapered hole.

[0050] A dovetail groove 64 for accommodating the sealing ring is formed on the tapered hole of the main valve seat 6 along the circumferential direction downward. The sealing ring constitutes a second sealing when the main valve core 5 is attached. The dovetail groove 64 effectively prevents the sealing ring from falling out. The dovetail groove 64 is provided with a round corner step 63 at the upper edge of the dovetail groove 64. The round corner step 63 leaves a certain space between the tapered hole and the tapered surface, which is used to accommodate the deformation of the sealing ring when the sealing ring is pressed by the tapered surface, thereby effectively preventing the sealing ring from being sheared and damaged. The dovetail groove 64 and the round corner step 63 effectively ensure the reliable installation of the sealing ring between the main valve core 5 and the main valve seat 6, and ensure the service life of the sealing ring.

[0051] In this embodiment, the double-layer sealing between the main valve core 5 and the main valve seat 6 effectively ensures the reliability of the sealing, and the coaxiality and other requirements for processing are relatively low, which is convenient for processing and assembly.

[0052] Further, as shown in the drawings, Figure 3 The main valve seat 6 is formed in one body by an external metal seat 61 and an internal plastic lining 62, so that the metal seat 61 ensures the axial installation and positioning of the main valve seat 6 in the center hole 16, and ensures the structural strength of the main valve seat 6. The plastic lining 62 is matched with the upper main valve core 5 for reliable sealing.

[0053] Further, the top end of the driving rod 8 is provided with a space for accommodating liquid at the joint with the main valve core 5; so that when the driving rod 8 goes up, the liquid in the space produces a fluid damping effect.

[0054] In this embodiment, as shown in the drawings, Figure 4 The top of the main valve core 5 is provided with a groove one 51 matched with the upper driven rod 3, and the bottom of the main valve core 5 is provided with a groove two 54 matched with the lower driving rod 8. In actual use, the bottom end of the driven rod 3 is matched with the groove one 51 with a small gap, and the top end of the driving rod 8 is matched with the groove two 54 with a large gap. There is also a distance between the top surface of the driving rod 8 and the inner top surface of the groove two 54.

[0055] Further, the valve core cover 4 is fixedly installed in the center hole 16 above the main valve seat 6. The valve core cover 4 is provided with an opening below to form a space for the main valve core 5 to move up and down, and the side wall of the valve core cover 4 is provided with an opening communicated with the water outlet 12.

[0056] When the main valve core 5 moves upward to separate from the main valve seat 6, the water below the main valve seat 6 will flow upward into the valve core cover 4 through the main valve seat 6, and flow out of the valve body 1 through the water outlet 12 through the side wall opening.

[0057] The valve core cover 4 is arranged to provide space for the upward and downward movement of the main valve core 5, and forms a channel for water to flow out of the water outlet 12 through the side wall opening.

[0058] Further, an inner step 17 is arranged on the inner wall surface of the center hole 16, and the bottom surface of the valve core cover 4 abuts against the top surface of the inner step 17; a sealing sleeve one 33 is sealingly fitted on the inner wall surface of the center hole 16 above the valve core cover 4, and an end cover 32 is threadedly fitted on the upper opening of the center hole 16 above the sealing sleeve one 33, and the sealing sleeve one 33 and the valve core cover 4 below are pressed downward by the end cover 32 to the inner step 17.

[0059] Through the threaded fitting of the end cover 32 relative to the valve body 1, combined with the arrangement of the inner step 17 inside the center hole 16, the installation and relative fixation of the sealing sleeve one 33 and the valve core cover 4 in the center hole 16 of the valve body 1 are realized from the axial direction by the end cover 32.

[0060] A sealing ring is press-fitted between the outer wall surface of the sealing sleeve one 33 and the inner wall surface of the center hole 16 along the circumferential direction, thereby realizing the separation of the center hole 16 above and below the sealing sleeve one 33.

[0061] Further, a large elastic body 31 is installed on one end of the driven rod 3 above the sealing sleeve one 33 and is jointly installed with the end cover 32, thereby applying a downward force to the driven rod 3 by the large elastic body 31, so that the main valve core 5 is pressed tightly to the main valve seat 6; the other end of the driven rod 3 passes through the sealing sleeve one 33 and the valve core cover 4 in sequence and is connected to the top of the main valve core 5, and the end cover 32 forms an outer through hole 15.

[0062] In this embodiment, the outer through hole 15 at the end cover 32 is communicated with the external environment, such as the external seawater environment, and the arrangement of the outer through hole 15 helps to ensure the smoothness and smoothness of the passive movement of the driven rod 3 when overcoming the elastic force of the large elastic body 31; the arrangement of the sealing sleeve one 33 avoids the water entering the end cover 32 from the outer through hole 15 from further entering the main valve core 5, thereby realizing the sealing of the structure.

[0063] Further, a valve sleeve 7 is fixedly installed in the center hole 16 below the main valve seat 6, and the valve sleeve 7 is laterally communicated with the water inlet 11; after the main valve core 5 moves upward to separate from the main valve seat 6, the top of the valve sleeve 7 is upwardly communicated through the main valve seat 6.

[0064] The arrangement of the valve sleeve 7 provides a flow channel for the water flowing through the one-way valve assembly 2 into the center hole 16, and after the main valve core 5 separates from the main valve seat 6, the water in the valve sleeve 7 can flow upward.

[0065] In this embodiment, a sealing ring is installed between the outer wall surface of the valve sleeve 7 above the water inlet 11 and the inner wall surface of the central hole 16 in the circumferential direction, so as to separate the upper main valve seat 6 from the lower water inlet 11 on the inner wall surface of the central hole 16, achieving structural sealing and preventing water from flowing up and down along the wall surface of the central hole 16.

[0066] Further, a sealing sleeve two 81 is sealingly fitted on the inner wall surface of the central hole 16 below the valve sleeve 7, and a bushing 82 is fitted in the central hole 16 below the sealing sleeve two 81;

[0067] In this embodiment, a sealing ring is installed between the outer wall surface of the sealing sleeve two 81 and the inner wall surface of the central hole 16 in the circumferential direction, so as to separate the upper and lower parts of the central hole 16 by the sealing ring on the outer wall surface of the sealing sleeve two 81, achieving structural sealing.

[0068] Further, one end of the drive rod 8 is sealingly fitted inside the bushing 82, and the other end of the drive rod 8 passes through the sealing sleeve two 81, the valve sleeve 7, and then towards the bottom of the main valve core 5. A liquid containing cavity is formed between the drive rod 8 below the sealing sleeve two 81 and the bushing 82, and the liquid containing cavity is in communication with the oil return port 13 through the damping hole 821 of the bushing 82. The oil return port 13 is connected to the oil return path of the external oil pressure source or the external oil tank, and the liquid containing cavity is filled with oil.

[0069] When the oil drives the drive rod 8 to move upwards, the oil in the liquid containing cavity will produce a fluid damping effect.

[0070] In this embodiment, as shown in Figure 5 the top surface of the bushing 82 is provided with a plurality of damping holes 821 that pass through the inside and outside in the radial direction. When the drive rod 8 is forced to move upwards, the oil in the liquid containing cavity will flow out through the damping holes 821 towards the oil return port 13.

[0071] In this embodiment, when the drive rod 8 moves upwards, the space between the top of the drive rod 8 and the main valve core 5, and the liquid containing cavity between the drive rod 8 and the bushing 82, will produce a fluid damping effect.

[0072] Further, a sealing ring is press-fitted between the outer wall surface of the bushing 82 and the inner wall surface of the central hole 16 in the circumferential direction;

[0073] In this embodiment, a sealing ring is press-fitted between the outer wall surface of the drive rod 8 and the inner wall surface of the bushing 82, and a sealing ring is also press-fitted between the outer wall surface of the bushing 82 and the inner wall surface of the central hole 16, so as to separate the liquid containing cavity from the oil that drives the end of the drive rod 8 to move upwards.

[0074] Further, a screw plug 9 is threadedly fitted at the lower opening of the central hole 16, and the screw plug 9 tightly presses the upper bushing 82, sealing sleeve two 81, and valve sleeve 7 against the bottom surface of the main valve seat 6, achieving axial installation and relative fixation.

[0075] In this embodiment, the bottom surface of the valve core cover 4 abuts against the inner step 17, the top surface of the lower main valve seat 6 abuts against the part of the bottom surface of the valve core cover 4 extending inwardly beyond the inner step 17, and the lower valve sleeve 7 abuts against the bottom surface of the main valve seat 6 upwardly; thus, based on the arrangement of the inner step 17, the axial mutual abutment and relative fixed installation between the various components inside the central hole 16 are achieved after the upper end cover 32 is screwed downwardly relative to the valve body 1 and the lower screw plug 9 is screwed upwardly relative to the valve body 1.

[0076] Further, the screw plug 9 axially penetrates to form a control oil port 14, the control oil port 14 is connected with an external oil pressure source, and the oil entering through the control oil port 14 exerts an upward force on the bottom end of the drive rod 8 to drive the drive rod 8 to move upwardly.

[0077] In Figure 1 In the embodiment shown, a buoyancy tank 20 is further included, which is connected to the one-way valve assembly 2 through a pipeline, and a pump 10 is installed in series on the pipeline. Under the action of the pump 10, the water in the buoyancy tank 20 flows out through the one-way check valve assembly, so that the gravity decreases and the buoyancy tank 20 can float upwardly. The buoyancy tank 20 is further provided with a water inlet valve 30 through a pipeline, and the buoyancy tank 20 takes in water through the water inlet valve 30 to increase the gravity and enable the buoyancy tank 20 to dive.

[0078] In this embodiment, the one-way valve assembly 2 has the following structure: a side valve seat 23 is fixedly installed on the wall surface of the outer hole of the water inlet 11, a side valve core 22 is axially movably arranged inside the water inlet 11, a small elastic body 21 is installed between the side valve core 22 and the convex ring 18 at the inner hole of the water inlet 11, and the small elastic body 21 drives the side valve core 22 to press tightly against the through hole of the side valve seat 23 to close it. After the external pressure overcomes the elastic force of the small elastic body 21 and pushes the side valve core 22 away from the side valve seat 23, the through hole of the side valve seat 23 is in communication with the central hole 16 through the water inlet 11 and the internal flow passage of the side valve core 22 in sequence.

[0079] The arrangement of the side valve core 22 and the small elastic body 21 in the one-way valve assembly 2 realizes the one-way performance of the flow passage; it can satisfy the water in the buoyancy tank 20 entering the valve body 1 and being discharged outwardly through the one-way valve assembly 2, and can effectively avoid the situation that the oil at the lower end of the drive rod 8 overflows through the one-way valve assembly 2.

[0080] A sealing ring is further installed between the abutment surface of the outer wall surface of the valve body 1 located at the circumferential outer part of the outer hole of the water inlet 11 and the side valve seat 23, to prevent the external seawater from entering the inside of the one-way valve assembly 2 from the abutment surface.

[0081] In this embodiment, the elastic force of the large elastic body 31 at the top of the driven rod 3 can reach thousands of N, while the elastic force of the small elastic body 21 in the one-way valve assembly 2 is only about ten N due to structural limitations. Thus, the sealing performance during use is effectively guaranteed by the hydraulic shut-off valve, and its sealing effect is far superior to that of the one-way valve itself.

[0082] The method of using the one-way shut-off valve assembly for buoyancy adjustment of a submersible in this embodiment includes the following steps:

[0083] Pump 10 operates when the buoyancy tank 20 needs to rise and reduce the internal water volume.

[0084] Water in the buoyancy tank 20 enters the central hole 16 through the one-way valve assembly 2 at the inlet 11 and exerts a force on the main valve core 5 to move upward and disengage from the main valve seat 6.

[0085] At the same time, the oil pushes the drive rod 8 upward, and the drive rod 8 pushes the main valve core 5 upward so that it is disengaged from the main valve seat 6.

[0086] Water in the central hole 16 flows upward through the main valve seat 6 and then out through the outlet 12;

[0087] The water in the buoyancy tank 20 is discharged, reducing the weight and enabling the vessel to float.

[0088] In this embodiment, the one-way shut-off valve assembly is mainly used on the drainage pipe of the buoyancy tank 20. By controlling the drainage, the amount of water in the buoyancy tank 20 is reduced and the tank floats. Conversely, when it is necessary to increase the amount of water to submerge, water is introduced into the buoyancy tank 20 by controlling the inlet valve 30.

[0089] In this invention, a check valve and a hydraulic shut-off valve are integrated on the same valve body 1. The check valve serves as the inlet of the hydraulic shut-off valve, while the outlet of the hydraulic shut-off valve is connected to the external environment. The opening and closing of the hydraulic shut-off valve is controlled by an external hydraulic control system.

[0090] The one-way shut-off valve assembly of the present invention has a high degree of integration, which greatly simplifies the structure of the buoyancy adjustment valve assembly, and also has the performance of a safety valve, with good sealing performance and high reliability.

[0091] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A one-way shut-off valve assembly for buoyancy adjustment of a submersible, characterized in that: The valve body (1) has a central hole (16) that runs vertically through it. The central hole (16) extends laterally from top to bottom along the axial direction with a water outlet (12), a water inlet (11), and an oil return port (13). A one-way valve assembly (2) is installed at the water inlet (11). A main valve seat (6) is fixed in the central hole (16) between the water inlet (11) and the water outlet (12). A main valve core (5) is installed above the main valve seat (6). The main valve core (5) is pushed by the driven rod (3) at the top and fits against the main valve seat (6) below, thus separating the water inlet (11) and the water outlet (12) in the central hole (16). A drive rod (8) is also installed in the central hole (16) below the main valve seat (6). The drive rod (8) moves upward under the push of the bottom oil and passes through the main valve seat. (6) Apply an upward force to the main valve core (5); the lower end of the main valve core (5) is set as a conical surface along the circumferential direction, and the center of the main valve seat (6) is set as a conical hole with the same angle as the conical surface. The main valve core (5) moves down to fit against the main valve seat (6) to form a double-layer seal along the circumferential direction; the outer wall surface of the main valve core (5) located above the conical surface protrudes outward along the circumferential direction to form a boss (52). When the main valve core (5) fits down against the main valve seat (6), the bottom surface of the boss (52) fits against the top surface of the main valve seat (6) to form a flat seal; a dovetail groove (64) for accommodating the sealing ring is opened downward along the circumferential direction on the conical hole of the main valve seat (6). The sealing ring forms a second seal when it fits against the main valve core (5); the upper edge of the dovetail groove (64) is set as a rounded step (63) where it connects with the conical hole.

2. A one-way shut-off valve assembly for buoyancy adjustment of a submersible as described in claim 1, characterized in that: The top of the drive rod (8) is provided with a space for containing liquid at the junction with the main valve core (5).

3. A one-way shut-off valve assembly for buoyancy adjustment of a submersible as described in claim 1, characterized in that: A valve core cover (4) is fixedly installed in the center hole (16) above the main valve seat (6). The opening below the valve core cover (4) forms a space for the main valve core (5) to move up and down. The side wall opening of the valve core cover (4) is connected to the water outlet (12). An inner step (17) is provided on the inner wall of the center hole (16). The bottom surface of the valve core cover (4) abuts against the top surface of the inner step (17). A sealing sleeve (33) is sealed on the inner wall of the center hole (16) above the valve core cover (4). An end cap (32) is threaded at the opening of the center hole (16) above the sealing sleeve (33). The end cap (32) presses the sealing sleeve (33) and the valve core cover (4) downwards against the inner step (17).

4. A one-way shut-off valve assembly for buoyancy adjustment of a submersible as described in claim 3, characterized in that: One end of the driven rod (3) is located above the sealing sleeve (33) and is installed with a large elastic body (31) together with the end cover (32). The other end of the driven rod (3) passes down through the sealing sleeve (33) and the valve core cover (4) and connects to the top of the main valve core (5). The end cover (32) is connected inside and out to form an external opening (15).

5. A one-way shut-off valve assembly for buoyancy adjustment of a submersible as described in claim 1, characterized in that: A valve sleeve (7) is fixedly installed in the center hole (16) below the main valve seat (6), and the valve sleeve (7) is laterally connected to the water inlet (11); after the main valve core (5) is disengaged from the main valve seat (6) upward, the top of the valve sleeve (7) is connected upward through the main valve seat (6); a sealing sleeve II (81) is sealed on the inner wall of the center hole (16) below the valve sleeve (7), and a bushing (82) is installed in the center hole (16) below the sealing sleeve II (81); one end of the drive rod (8) The seal is fitted inside the bushing (82), and the other end of the drive rod (8) passes through the second sealing sleeve (81) and the valve sleeve (7) in sequence and then faces the bottom of the main valve core (5); the drive rod (8) located below the second sealing sleeve (81) and the bushing (82) form a liquid cavity, and the liquid cavity is connected to the return oil port (13) through the damping hole (821) that penetrates the bushing (82) from the inside and outside; the return oil port (13) is connected to the return oil circuit of the external hydraulic power source or the external oil tank, and the liquid cavity is filled with oil.

6. A one-way shut-off valve assembly for buoyancy adjustment of a submersible as described in claim 5, characterized in that: A sealing ring is press-fitted between the outer wall of the bushing (82) and the inner wall of the center hole (16); a screw plug (9) is threaded at the lower opening of the center hole (16), and the upper bushing (82), sealing sleeve 2 (81), and valve sleeve (7) are pressed upward against the bottom surface of the main valve seat (6) by the screw plug (9); the screw plug (9) is axially connected to form a control oil port (14), which is connected to the external hydraulic power supply port. The oil entering through the control oil port (14) exerts upward force on the bottom end of the drive rod (8), driving the drive rod (8) upward.

7. A one-way shut-off valve assembly for buoyancy adjustment of a submersible as described in claim 1, characterized in that: It also includes a buoyancy tank (20), which is connected to a one-way valve assembly (2) via a pipeline. A pump (10) is installed in series on the pipeline. Under the action of the pump (10), the water in the buoyancy tank (20) flows out through the one-way shut-off valve assembly. A water inlet valve (30) is also installed on the buoyancy tank (20) via a pipeline.

8. A method of using the one-way shut-off valve assembly for buoyancy adjustment of a submersible as described in claim 7, characterized in that: Includes the following steps: When the buoyancy tank (20) needs to float up and reduce the internal water volume, the pump (10) operates; Water in the buoyancy tank (20) enters the central hole (16) through the one-way valve assembly (2) at the inlet (11) and exerts a force on the main valve core (5) to move upward and disengage from the main valve seat (6); At the same time, the oil pushes the drive rod (8) upward, and through the drive rod (8) pushes the main valve core (5) upward, causing it to disengage from the main valve seat (6). Water in the central hole (16) flows upward through the main valve seat (6) and then out through the outlet (12); The water in the buoyancy tank (20) is discharged, the weight is reduced, and the water floats.

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