A lifting type multi-channel self-sealing opening and closing device for a sea valve

Abstract

This invention discloses a lift-type multi-channel self-sealing opening and closing device for a sea valve, relating to the field of flow control technology. The device includes a flow assembly comprising several main channels and a sealing cover plate located at one end of each main channel for connecting to external fluid. Several sets of telescopic drive mechanisms are symmetrically arranged on the outer periphery of the main channels, with the telescopic ends of the drive mechanisms connected to the sealing cover plates. A pressurizing assembly is provided on each main channel, including a bypass pipe and a control valve disposed on the bypass pipe. The outlet end of the bypass pipe penetrates the outer wall of the main channel to connect to the interior of the main channel, while the inlet end of the bypass pipe connects to external fluid. This invention can reduce the driving force and opening time required for opening and achieve self-sealing in the closed state of the valve.

Description

Technical Field

[0001] This invention relates to the field of flow control technology, specifically to a lifting multi-channel self-sealing opening and closing device for a sea valve. Background Technology

[0002] Sea access valves are installed at the sea entrances of ships, offshore platforms, and diving equipment to control the flow of cooling water between the inside and outside of the tank. In the event of an accident such as a breach in the internal cooling water pressure boundary, these valves can quickly and reliably disconnect the connection to the external cooling water, preventing the accident from escalating further.

[0003] Traditional sea valves, such as butterfly valves and tongue valves, have structural forms. On the one hand, the sealing cover structure occupies part of the flow channel, causing severe disturbance to the internal flow and increasing flow resistance. On the other hand, these valves open and close by rotating the sealing cover, resulting in a relatively long action time. For large-diameter and high-pressure differential applications, the opening and closing torque is large, requiring a large drive power. This necessitates the use of a high-power electric motor or a worm gear structure to convert hydraulic drive force into rotational torque, leading to a large drive mechanism size. In ultra-deep operating environments, there is also a contradiction between flow capacity, sealing reliability, and structural safety. Larger channel sizes increase the likelihood of deformation and sealing difficulty, and also require higher structural strength. However, if the channel size is too small, the flow rate requirements cannot be met. Summary of the Invention

[0004] This application provides a lifting-type multi-channel self-sealing opening and closing device for a sea valve, which can solve the technical problems existing in the prior art where the cover structure of the traditional sea valve has a drive mechanism that occupies the internal space of the flow channel and rotates in a spiral manner during opening and closing. This not only results in high flow resistance and long action time, but also makes it difficult to seal the large sea valve in ultra-deep use environments. Furthermore, the pressure difference between the inside and outside of the sea valve will further increase the opening and closing time and resistance.

[0005] This application provides a lifting-type multi-channel self-sealing opening and closing device for a sea valve, comprising:

[0006] A flow assembly includes several main channels and a sealing cover plate located at one end of each main channel for communicating with external fluid. The sealing cover plate has a protrusion at the bottom. Several sets of telescopic drive mechanisms are symmetrically arranged on the outer periphery of the main channels, and the telescopic ends of the telescopic drive mechanisms are connected to the sealing cover plate.

[0007] Each of the main channels is provided with a pressurization assembly, which includes a bypass pipe and a control valve disposed on the bypass pipe. The outlet end of the bypass pipe penetrates the outer wall of the main channel to connect to the interior of the main channel, and the inlet end of the bypass pipe connects to the external fluid.

[0008] In one embodiment, the flow assembly further includes a horizontally arranged fixed main board, with one end of the main flow channel having the sealing cover plate passing through the fixed main board.

[0009] In one embodiment, the fixed end of the telescopic drive mechanism is fixedly disposed on the top of the fixed main board, and the telescopic end passes through the fixed main board and is connected to the sealing cover.

[0010] In one embodiment, the sealing cover includes a plate body and a recessed portion disposed in the middle of the plate body, and the cross-sectional area of ​​the plate body is smaller than the cross-sectional area of ​​the fixed main plate.

[0011] In one embodiment, the telescopic end of the telescopic drive mechanism passes through the plate body, and the telescopic end of the telescopic drive mechanism is provided with fixing nuts located on the top and bottom surfaces of the plate body, respectively.

[0012] In one embodiment, the bottom end of the recess protrudes from the bottom surface of the plate body to form a protrusion, and the diameter of the opening at the top of the recess is smaller than the diameter of the main flow channel outlet.

[0013] In one embodiment, a fitting ring protruding from the upper surface of the plate body is provided at the outer periphery of the top opening of the recessed portion, and the outer diameter of the fitting ring is equal to the inner diameter of the main flow outlet end.

[0014] In one embodiment, the outlet end of the bypass pipe penetrates the outer wall of the main channel, and the penetration point is at a horizontal height higher than the top of the fixed end of the telescopic drive mechanism.

[0015] In one embodiment, the inlet end of the bypass pipe passes through the fixed main board and is connected to external fluid.

[0016] In one embodiment, the bypass pipe includes a main pipe and a plurality of branch pipes connected to the main pipe, each branch pipe being connected to one of the main pipes, the inlet end of the bypass pipe being located at the end of the main pipe, and the outlet end of the bypass pipe being located at the end of the branch pipe.

[0017] The beneficial effects of the technical solutions provided in this application include:

[0018] 1. By setting up multiple independent main channels, the diameter of each main channel can be relatively reduced. This can ensure the fluid inlet and outlet requirements of ships, offshore platforms and other devices in actual use, while reducing the deformation risk and sealing difficulty caused by traditional large-size channels. At the same time, it can also improve the overall fault tolerance of the device to a certain extent. Even if one of the main channels has an emergency, the other main channels can still be opened and closed normally.

[0019] 2. By setting a telescopic drive mechanism, the sealing valve plate can be driven to move up and down in a linear motion trajectory to achieve opening and closing action. Its opening and closing time is shorter. At the same time, the bottom surface of the sealing valve plate is set with a certain curvature, which can increase the contact area with the external fluid, making the clamping force of the external fluid more comprehensive and uniform, and achieving self-sealing.

[0020] 3. By setting up a bypass pipe, the pressure inside and outside the main channel can be balanced before the main channel is opened, thereby reducing the opening driving force. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A cross-sectional view of a lifting multi-channel self-sealing opening and closing device for a sea valve provided in an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of a lifting multi-channel self-sealing opening and closing device for a sea valve, provided in an embodiment of this application.

[0024] In the diagram: 1. Main channel; 2. Sealing cover; 201. Plate body; 202. Recessed part; 203. Fitting ring; 3. Telescopic drive mechanism; 301. Fixing nut; 4. Bypass pipe; 5. Control valve; 6. Fixing main board. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0026] This application provides a lifting-type multi-channel self-sealing opening and closing device for a sea valve, which can solve the technical problems existing in the prior art where the cover structure of the traditional sea valve has a drive mechanism that occupies the internal space of the flow channel and rotates in a spiral manner during opening and closing. This not only results in high flow resistance and long action time, but also makes it difficult to seal the large sea valve in ultra-deep use environments. Furthermore, the pressure difference between the inside and outside of the sea valve will further increase the opening and closing time and resistance.

[0027] The lifting-type multi-channel self-sealing opening and closing device for sea valves in this application includes a flow component and a pressure boosting component. The flow component is used to enable communication between the vessel, offshore platform, and other equipment and the external fluid, and controls the flow of fluid by changing its own state as needed. Its opening and closing action is linear. Compared with the traditional rotary opening and closing action, the linear opening and closing action not only has a shorter stroke and requires a shorter opening and closing time, but also has no complex component structure. In ultra-deep operating environments, it can effectively reduce the probability of component failure and improve structural safety. The pressure boosting component is set on the flow component and independently connects the flow component to the external fluid. When the flow component is closed, its internal pressure is less than the external pressure. Therefore, the flow component can increase the internal pressure of the flow component before opening, so that its internal pressure is equal to the external pressure. Then the flow component performs the opening action, which can effectively reduce the opening resistance and reduce the opening torque.

[0028] Specifically, Figure 1 A cross-sectional view of a lifting multi-channel self-sealing opening and closing device for a sea valve provided in an embodiment of this application is shown below. Figure 1 As shown, the channel assembly in this application includes several main channels 1 and a sealing cover 2 located at one end of each main channel 1 for connecting to the external fluid. The bottom of the sealing cover 2 is provided with a protrusion. Several sets of telescopic drive mechanisms 3 are symmetrically arranged on the outer periphery of each main channel 1, and the telescopic end of the telescopic drive mechanism 3 is connected to the sealing cover 2.

[0029] Each main channel 1 is a longitudinally arranged cylinder, with one end connected to the interior of the ship, offshore platform, or other equipment, and the other end extending outward into the external fluid environment. Compared to a traditional single channel, the channel assembly in this application arranges multiple main channels 1, and each main channel 1 can independently perform opening and closing actions. In one possible implementation, there are two main channels 1, which are arranged left and right at intervals. Based on this structure, the diameter of each main channel 1 can be relatively reduced, which can ensure the fluid inflow and outflow requirements of the ship, offshore platform, and other equipment in actual use, while reducing the deformation risk and sealing difficulty caused by traditional large-size channels. At the same time, it can also improve the overall fault tolerance of the equipment to a certain extent. Even if one of the main channels 1 experiences a sudden situation, the other main channels 1 can still be opened and closed normally.

[0030] The number of sealing covers 2 is the same as the number of main channels 1. They are located at one end of each main channel 1 extending beyond the ship, offshore platform, or other equipment, and tightly seal with that end to ensure the sealing of the main channel 1. In the closed state, external fluid can exert a compressive force on the sealing cover 2. The protrusion at the bottom of the sealing cover 2 increases the contact area between the sealing cover 2 and the external fluid, allowing it to withstand compressive forces from all directions, making the compressive force more comprehensive and uniform, and improving the self-sealing effect. The telescopic drive mechanism 3 serves as the power mechanism for driving the opening and closing of the sealing cover 2, ensuring the sealing... The sealing cover 2 ensures uniform force distribution, reducing sluggishness during opening and closing. Multiple sealing covers 2 are symmetrically arranged around the outer periphery of each main channel 1. In one possible implementation, four sets of telescopic drive mechanisms 3 are arranged around the outer periphery of each main channel 1. These four sets of telescopic drive mechanisms 3 are radially symmetrical along the main channel 1, with their telescopic direction along the length of the main channel 1. Each telescopic drive mechanism 3 includes a fixed end and a telescopic end. The fixed end is fixedly disposed around the outer periphery of the main channel 1, while the telescopic end faces downward and connects to the sealing cover 2. Through its own telescopic movement, it achieves linear opening and closing of the entire device. Based on this structure, the telescopic drive mechanisms 3, arranged around the outer periphery of the main channel 1, do not occupy the internal space of the main channel 1 and do not cause flow disturbance within the main channel 1, thereby reducing flow resistance.

[0031] In one possible implementation, the hydraulic cylinder of the drive mechanism has a built-in piston, which is connected to the sealing cover plate 2 through the piston rod. The piston reciprocates and drives the sealing cover plate 2 to move up and down, thereby opening and closing the main channel 1.

[0032] Furthermore, the pressurization assembly includes a bypass pipe 4 and a control valve 5 disposed on the bypass pipe 4. The outlet end of the bypass pipe 4 penetrates the outer wall of the main channel 1 where the bypass pipe 4 is located to connect to the interior of the main channel 1, and the inlet end of the bypass pipe 4 connects to the external fluid.

[0033] The control valve 5 is mainly used to control the on / off state of the bypass pipe 4. It can be a mechanical valve or an electronic valve, which is not limited in this application. When the main channel 1 is closed, the bypass pipe 4 is disconnected. At this time, the internal pressure of the main channel 1 is less than the external fluid environment pressure. Under this pressure difference, the sealing cover 2 is tightly fitted with the main channel 1 to achieve reliable self-sealing. Before opening the sealing cover 2 to connect the main channel 1, the control valve 5 controls the bypass pipe 4 to connect. The external fluid enters the main channel 1 through the bypass pipe 4, thereby increasing the pressure of the main channel 1 until the internal pressure of the main channel 1 is consistent with the external fluid environment pressure. Then, the control valve 5 controls the bypass pipe 4 to close, and the telescopic drive mechanism 3 extends, pushing the sealing cover 2 away from the main channel 1 to complete the opening operation.

[0034] Furthermore, the circulation component also includes a horizontally arranged fixed main board 6. One end of the main channel 1 with a sealing cover 2 passes through the fixed main board 6. In one possible embodiment, the fixed main board 6 is configured as a circular plate to reduce the weight of materials and devices while ensuring sufficient installation space for multiple main channels 1. To increase structural integrity and pressure resistance, the material of the fixed main board 6 is the same as that of the main channel 1, both using high-hardness metal materials. One end of the main channel 1 with the sealing cover 2 passes through the fixed main board 6 and is placed in the external fluid environment. The outer wall of the main channel 1 at the penetration point forms an integral part with the fixed main board 6.

[0035] In one possible implementation, the upper surface of the fixed main board 6 is also provided with several stiffening plates. A set of stiffening plates is provided between each pair of adjacent main channels 1 so that the two ends of the stiffening plates abut against the outer walls of the two adjacent main channels 1 and are fixed to form an integral whole, thereby increasing the lateral shear strength of the main channels 1 in ultra-deep use environments.

[0036] Furthermore, the fixed end of the telescopic drive mechanism 3 is fixedly disposed on the top of the fixed main board 6, and the telescopic end passes through the fixed main board 6 and is connected to the sealing cover plate 2. The telescopic drive mechanism 3 is vertically disposed, and its fixed end is fixed to the top surface of the fixed main board 6. The fixing method includes a variety of methods, including but not limited to interlocking connection, bolt connection and other methods. No specific limitation is made in this application. After the telescopic end of the telescopic drive mechanism 3 passes through the fixed main board 6 longitudinally, it is stably connected to the sealing cover plate 2 to realize the longitudinal position adjustment of the sealing cover plate 2.

[0037] Furthermore, Figure 2 This application provides a schematic diagram of a lifting multi-channel self-sealing opening and closing device for a sea valve, as shown in the embodiments of this application. Figure 2 As shown, the sealing cover 2 includes a plate body 201 and a recessed portion 202 disposed in the middle of the plate body 201. The cross-sectional area of ​​the plate body 201 is smaller than the cross-sectional area of ​​the fixed main plate 6. Based on the above description, there are four sets of telescopic drive mechanisms 3. Therefore, to facilitate the positioning of the connection points between the four sets of telescopic drive mechanisms 3 and the sealing cover 2, and also to facilitate the arrangement of the sealing cover 2 at the bottom of the fixed main plate 6 and avoid mutual interference among multiple sealing covers 2, in one embodiment of this application, the sealing cover 2 is configured with a square cross-section. (Viewed from above) From a visual perspective, the plate body 201 is square, and the recessed part 202 is circular. From a frontal view, the recessed part 202 is hemispherical, and the bottom of the recessed part 202 protrudes from the bottom surface of the plate body 201, so that the bottom surface of the sealing cover 2 has a certain curvature. The curved design of the recessed part 202 allows the sealing cover 2 to bear the pressure of the fluid more evenly when closed, avoiding local stress concentration, thereby improving the durability and sealing performance of the sealing cover 2. It can also reduce the resistance when the fluid passes through, and reduce turbulence and energy loss.

[0038] Further details can be found here. Figure 2The telescopic drive mechanism 3 has its telescopic end penetrating through the plate body 201, and its telescopic end is provided with fixing nuts 301 located on the top and bottom surfaces of the plate body 201, respectively. The telescopic drive mechanism 3 is located at the four corners directly opposite the plate body 201, and its telescopic end simultaneously penetrates through and fixes the main plate 6 and the plate body 201. Each telescopic drive mechanism 3 is provided with two fixing nuts 301. In the assembled state, the two fixing nuts 301 are fixed to the top and bottom surfaces of the plate body 201, respectively, which facilitates the adjustment of the position of the sealing cover 2 or maintenance and replacement.

[0039] Furthermore, the diameter of the opening at the top of the recessed portion 202 is smaller than the diameter of the outlet end of the main channel 1. The position of the recessed portion 202 corresponds to the position of the main channel 1. A fitting ring 203 protruding from the upper surface of the plate portion 201 is provided on the outer periphery of the opening at the top of the recessed portion 202, and the outer diameter of the fitting ring 203 is equal to the inner diameter of the outlet end of the main channel 1.

[0040] Based on the above description, the recessed portion 202 is a hemispherical shape with an open top. The fitting ring 203 is disposed on the outer periphery of its top. The fitting ring 203 has a certain height and its outer diameter is equal to the inner diameter of the outlet end of the main channel 1. When the sealing cover plate 2 is driven by the telescopic drive mechanism 3 and approaches the main channel 1, the fitting ring 203 fits tightly with the inner wall of the main channel 1 to form a sealing surface and block the flow of fluid. At the same time, the design of the fitting ring 203 also enables the sealing cover plate 2 to be accurately embedded in the main channel 1 when closed, ensuring the accuracy and consistency of closing.

[0041] Further details can be found here. Figure 1 The outlet end of the bypass pipe 4 penetrates the outer wall of the main channel 1, and the penetration point is higher than the top of the fixed end of the telescopic drive mechanism 3. In one possible embodiment, the bypass pipe 4 is arranged in an inverted L shape, including a horizontal pipe and a vertical pipe. The outlet end of the bypass pipe 4 is set on the horizontal pipe and penetrates the outer wall of the main channel 1. External fluid enters the interior of the main channel 1 through the bypass pipe 4. In the closed state, the interior of the main channel 1 itself contains fluid. Therefore, the horizontal position of the outlet end of the bypass pipe 4 is set relatively high, so that the external fluid needs to overcome a small static pressure difference when entering the main channel 1, thereby reducing the pressure when flowing in. The higher outlet end position allows the external fluid to mix with the fluid inside the main channel 1 in a relatively gentle manner, avoiding local pressure fluctuations, and can also reduce the impact on the bypass pipe 4 and the control valve 5 to a certain extent.

[0042] Furthermore, the bypass pipe 4 can be configured in various ways. In one possible implementation, an independent bypass pipe 4 is provided on each main channel 1. Taking two main channels 1 as an example, there are two independent bypass pipes 4. The outlet end of each bypass pipe 4 penetrates the outer wall of the main channel 1 where the bypass pipe 4 is located. The inlet end of each bypass pipe 4 is independently provided and connected to the external fluid.

[0043] In another possible implementation, the bypass pipe 4 includes an inlet end and multiple outlet ends. That is, the bypass pipe 4 includes a main pipe and multiple branch pipes connected to the main pipe. Each branch pipe is connected to a main channel 1. The inlet end of the bypass pipe 4 is located at the end of the main pipe, and the outlet end of the bypass pipe 4 is located at the end of the branch pipe. In this implementation, the bypass pipe 4 adopts the form of a common inlet and multiple outlets. Taking two main channels 1 as an example, one end of the main pipe is connected to the external fluid, and the other end extends into two branch pipes. The free ends of the two branch pipes are respectively connected to the two main channels 1. However, considering the arrangement space, if there are too many branch pipes, the spatial projection will be large. Therefore, in this embodiment, it is preferable for each main pipe to branch into two branch pipes. If there are more main channels 1, multiple bypass pipes 4 are arranged, and each bypass pipe 4 connects to the two closest main channels 1.

[0044] Furthermore, the outlet end of the bypass pipe 4 is located on the vertical pipe, and the fixed main board 6 serves as the boundary between the internal and external environments. Above the fixed main board 6 is the interior of the equipment such as ships and offshore platforms, and below the fixed main board 6 is the external fluid environment. Therefore, the inlet end of the bypass pipe 4 passes through the fixed main board 6 to connect with the external fluid.

[0045] The operating mechanism of the lifting multi-channel self-sealing opening and closing device for the sea valve in this application is as follows: When the main channel 1 is closed, due to fluid consumption or pressure reduction through an additional pressure relief device, the internal pressure of the main channel 1 is close to the internal environmental pressure of the ship, offshore platform, etc., and less than the external fluid environmental pressure. At this time, the sealing cover 2 is subjected to the clamping force given by the external fluid. Under the action of this clamping force, the sealing surface between the sealing cover 2 and the main channel is tightly fitted, achieving reliable self-sealing. When the main channel 1 needs to be opened, the bypass pipe 4 is opened first. At this time, due to the internal and external pressure difference, the external fluid will automatically enter the main channel 1 through the bypass pipe 4, thereby increasing the internal pressure of the main channel 1, so that the clamping force of the fluid acting on the sealing cover 2 disappears. Then, the telescopic drive mechanism 3 is activated to push the sealing cover 2 away from the main channel with a linear motion trajectory.

[0046] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0047] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A lifting multi-pass self-sealing opening and closing device for a sea valve, characterized in that, include: The flow assembly includes several main channels (1) and a sealing cover (2) located at one end of each main channel (1) for connecting to external fluid. The sealing cover (2) has a protrusion at the bottom. Several sets of telescopic drive mechanisms (3) are symmetrically arranged on the outer periphery of the main channel (1), and the telescopic end of the telescopic drive mechanism (3) is connected to the sealing cover (2). A pressurization assembly is provided on each of the main channels (1). The pressurization assembly includes a bypass pipe (4) and a control valve (5) provided on the bypass pipe (4). The outlet end of the bypass pipe (4) passes through the outer wall of the main channel (1) where the bypass pipe (4) is located to connect to the interior of the main channel (1). The inlet end of the bypass pipe (4) is connected to the external fluid. The circulation component also includes a horizontally arranged fixed main board (6), and one end of the main channel (1) with the sealing cover (2) passes through the fixed main board (6). The sealing cover (2) includes a plate body (201) and a recessed portion (202) disposed in the middle of the plate body (201), and the cross-sectional area of ​​the plate body (201) is smaller than the cross-sectional area of ​​the fixed main plate (6).

2. The lifting-type multi-channel self-sealing opening and closing device for a sea valve as described in claim 1, characterized in that: The fixed end of the telescopic drive mechanism (3) is fixedly installed on the top of the fixed main board (6), and the telescopic end passes through the fixed main board (6) and is connected to the sealing cover plate (2).

3. The lifting-type multi-channel self-sealing opening and closing device for a sea valve as described in claim 1, characterized in that: The telescopic drive mechanism (3) has its telescopic end penetrating the plate body (201), and the telescopic drive mechanism (3) has fixing nuts (301) located on the top and bottom surfaces of the plate body (201) respectively.

4. A lifting-type multi-channel self-sealing opening and closing device for a sea valve as described in claim 3, characterized in that: The bottom end of the recess (202) protrudes from the bottom surface of the plate (201) to form a protrusion, and the diameter of the opening at the top of the recess (202) is smaller than the diameter of the outlet end of the main channel (1).

5. A lifting-type multi-channel self-sealing opening and closing device for a sea valve as described in claim 4, characterized in that: The top opening of the recessed portion (202) is provided with a fitting ring (203) protruding from the upper surface of the plate portion (201), and the outer diameter of the fitting ring (203) is equal to the inner diameter of the outlet end of the main channel (1).

6. A lifting-type multi-channel self-sealing opening and closing device for a sea valve as described in claim 1, characterized in that: The outlet end of the bypass pipe (4) penetrates the outer wall of the main channel (1), and the penetration point is higher than the top of the fixed end of the telescopic drive mechanism (3).

7. A lifting-type multi-channel self-sealing opening and closing device for a sea valve as described in claim 6, characterized in that: The inlet end of the bypass pipe (4) passes through the fixed main board (6) and is connected to the external fluid.

8. A lifting-type multi-channel self-sealing opening and closing device for a sea valve as described in claim 1, characterized in that: The bypass pipe (4) includes a main pipe and multiple branch pipes connected to the main pipe. Each branch pipe is connected to a main pipe (1). The inlet end of the bypass pipe (4) is located at the end of the main pipe, and the outlet end of the bypass pipe (4) is located at the end of the branch pipe.

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