Lifting type multi-channel self-sealing opening and closing device for kingston valve

Abstract

The invention discloses a lifting type multi-channel self-sealing opening and closing device for a kingston valve, and relates to the technical field of flow control, and the lifting type multi-channel self-sealing opening and closing device for the kingston valve comprises a circulation assembly. The circulation assembly comprises a plurality of main flow channels and sealing cover plates located in the main flow channels and used for communicating with one end of external fluid, a plurality of telescopic driving mechanisms are symmetrically arranged on the peripheries of the main flow channels, and the telescopic ends of the telescopic driving mechanisms are connected with the sealing cover plates; each main flow channel is provided with a pressurizing assembly, the pressurizing assembly comprises a bypass pipeline and a control valve arranged on the bypass pipeline, the outflow end of the bypass pipeline penetrates through the outer wall of the main flow channel where the bypass pipeline is located so as to be communicated with the interior of the main flow channel, and the inflow end of the bypass pipeline is communicated with external fluid. Driving force required for opening and opening time can be reduced, and self-sealing of the valve in the closed state can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of flow control, and in particular to a lifting multi-channel self-sealing opening and closing device for a sea valve. Background Art

[0002] Vessels, offshore platforms, and submersibles are equipped with sea valves to control the flow of cooling water inside and outside the vessel. In the event of an incident such as a breach in the internal cooling water pressure barrier, these valves can quickly and reliably cut off the connection to the external cooling water, preventing further damage.

[0003] Traditional sea valves have butterfly valves and tongue valves. On the one hand, the sealing cover plate structure occupies part of the flow channel, causing severe disturbances to the internal flow and increasing flow resistance. On the other hand, this type of valve structure is opened and closed by rotating the sealing cover plate, which takes a long time to operate. For large-diameter and large pressure differential use conditions, the opening and closing torque is large, and the required driving power is large, requiring the use of a high-power electric motor or the use of a worm gear structure to convert the hydraulic driving force into a rotational torque, resulting in a larger drive mechanism. In ultra-deep use environments, there is also a contradiction between flow capacity and sealing reliability and structural safety. The larger the channel size, the more likely it is to deform, the more difficult it is to seal, and the higher the structural strength requirements. However, if the channel size is too small, it cannot meet the flow rate requirements. Summary of the Invention

[0004] The present application provides a lifting multi-channel self-sealing opening and closing device for a sea valve, which can solve the technical problems in the prior art that when the cover plate structure of the traditional sea valve is opened and closed, the driving mechanism occupies the internal space of the flow channel and opens and closes in a spiral rotation manner, which not only has large flow resistance and long action time, but also has great difficulty in sealing the larger sea valve in an ultra-deep usage environment, and the pressure difference between the inside and outside of the sea valve will further increase the opening and closing time and resistance.

[0005] The embodiment of the present application provides a lifting multi-channel self-sealing opening and closing device for a sea valve, comprising: A circulation assembly, the circulation assembly comprising a plurality of main flow channels and a sealing cover plate at one end of each main flow channel for communicating with an external fluid, the sealing cover plate having a protrusion at the bottom, and a plurality of groups of telescopic drive mechanisms symmetrically arranged on the periphery of the main flow channels, with the telescopic ends of the telescopic drive mechanisms connected to the sealing cover plate; A booster assembly is provided on each of the main channels, and the booster assembly includes a bypass pipe and a control valve provided on the bypass pipe. The outflow end of the bypass pipe passes through the outer wall of the main channel where the bypass pipe is located to communicate with the interior of the main channel, and the inlet end of the bypass pipe is connected to the external fluid.

[0006] In one embodiment, the circulation component further includes a horizontally arranged fixed main board, and the main flow channel is provided with an end of the sealing cover plate passing through the fixed main board.

[0007] In one embodiment, the fixed end of the telescopic drive mechanism is fixedly arranged 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 plate.

[0008] In one embodiment, the sealing cover plate includes a plate body and a recessed portion provided in the middle of the plate body, and a cross-sectional area of ​​the plate body is smaller than a cross-sectional area of ​​the fixed main plate.

[0009] 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 respectively located on the top surface and the bottom surface of the plate body.

[0010] In one embodiment, the bottom end of the lower recess protrudes from the bottom surface of the plate body to form a protrusion, and the diameter of the top opening of the lower recess is smaller than the diameter of the outflow end of the main channel.

[0011] In one embodiment, a fitting ring protruding from the upper surface of the plate body is provided on the outer periphery of the top opening of the lower recessed portion, and the outer diameter of the fitting ring is equal to the inner diameter of the outflow end of the main channel.

[0012] In one embodiment, the outflow end of the bypass pipe passes through the outer wall of the main channel, and the penetration point is higher than the horizontal height of the top of the fixed end of the telescopic drive mechanism.

[0013] In one embodiment, the inlet end of the bypass pipe passes through the fixed main board and is connected to the external fluid.

[0014] In one embodiment, the bypass pipe includes a main pipe and multiple branch pipes connected to the main pipe, each branch pipe is connected to a main channel, the inlet end of the bypass pipe is located at the end of the main pipe, and the outlet end of the bypass pipe is located at the end of the branch pipe.

[0015] The beneficial effects of the technical solutions provided in the embodiments of the present application include: 1. By setting up multiple independent main channels, the diameter of each main channel can be relatively reduced, which can not only ensure the fluid inlet and outlet requirements of ships, offshore platforms and other devices in actual use, but also reduce the deformation risk and sealing difficulty brought 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 an emergency occurs in one of the main channels, the other main channels can still open and close normally. 2. By setting up a telescopic drive mechanism, the sealing valve plate can be driven up and down in a linear motion trajectory to realize the opening and closing action, and the 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 pressing force of the external fluid more comprehensive and uniform, and realizing self-sealing; 3. By setting up a bypass pipe, the pressure inside and outside the main channel can be balanced before opening the main channel, thereby reducing the opening driving force. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] 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 the present application; Figure 2 A schematic structural diagram of a lifting multi-channel self-sealing opening and closing device for a sea valve provided in an embodiment of the present application.

[0018] In the figure: 1. main channel; 2. sealing cover plate; 201. plate body; 202. recessed portion; 203. engaging ring; 3. telescopic drive mechanism; 301. fixing nut; 4. bypass pipe; 5. control valve; 6. fixing main board. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] The embodiment of the present application provides a lifting multi-channel self-sealing opening and closing device for a sea valve, which can solve the technical problems in the prior art that when the cover plate structure of the traditional sea valve is opened and closed, the driving mechanism occupies the internal space of the flow channel and opens and closes in a spiral rotation manner, which not only has large flow resistance and long action time, but also, in an ultra-deep usage environment, it is difficult to seal the larger sea valve, and the internal and external pressure difference of the sea valve will further increase the opening and closing time and resistance.

[0021] The lifting multi-channel self-sealing opening and closing device for sea valves in the present application includes a circulation component and a boosting component. The circulation component is used to realize the mutual communication between ships, offshore platforms and other devices and the external fluid and control the flow of the fluid by changing its own state according to demand. The 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, but also requires a shorter opening and closing time. It has no complex component structure. In an ultra-deep use environment, it can effectively reduce the probability of component failure and improve structural safety. The boosting component is arranged on the circulation component and independently connects the circulation component with the external fluid. When the circulation component is closed, its internal pressure is less than the external pressure. The circulation component can increase the internal pressure of the circulation component before the circulation component is opened, so that its internal pressure is equal to the external pressure. Then the circulation component performs the opening action, which can effectively reduce the opening resistance and reduce the opening torque.

[0022] 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 the present application, as shown in FIG. Figure 1 As shown, the channel assembly in the present application includes several main channels 1 and a sealing cover plate 2 located at one end of each main channel 1 for connecting to the external fluid, a protrusion is provided at the bottom of the sealing cover plate 2, and several groups of telescopic drive mechanisms 3 are symmetrically provided 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 plate 2.

[0023] A single main channel 1 is a longitudinally arranged cylinder as a whole, one end of which is connected to the interior of a ship, an offshore platform or other device, and the other end extends outside and is located in the external fluid environment. Compared with the traditional single channel, multiple main channels 1 are arranged in the channel assembly in the present application, and each main channel 1 can independently perform opening and closing actions. In a possible embodiment, the number of main channels 1 is two, and the two main channels 1 are arranged at intervals on the left and right. Based on this structure, the diameter of each main channel 1 can be relatively reduced, that is, it can ensure the fluid inlet and outlet requirements of ships, offshore platforms and other devices in actual use, and can reduce the deformation risk and sealing difficulty brought 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 an emergency occurs in one of the main channels 1, the remaining main channels 1 can also be opened and closed normally.

[0024] The number of sealing covers 2 is consistent with that of main channels 1. They are located at a port of each main channel 1 extending out of a ship, offshore platform or other device, and are tightly covered with the port to ensure the sealing of the port of the main channel 1. In the covered state, the external fluid can give the sealing cover 2 a pressing force. The protrusion at the bottom of the sealing cover 2 can increase the contact area between the sealing cover 2 and the external fluid, and withstand the pressing force in all directions, making the pressing force more comprehensive and uniform, thereby improving the self-sealing effect. The telescopic drive mechanism 3 serves as a power mechanism for driving the opening and closing of the sealing cover 2 to ensure the sealing. The sealing cover plate 2 is evenly stressed to reduce jamming during opening and closing. There are multiple of them, symmetrically arranged around the periphery of each main channel 1. In one possible embodiment, four sets of telescopic drive mechanisms 3 are arranged around the periphery of each main channel 1. The four sets of telescopic drive mechanisms 3 are radially symmetrical along the main channel 1, with their telescopic directions set along the length of the main channel 1. The telescopic drive mechanisms 3 include a fixed end and a telescopic end. The fixed end is fixedly mounted on the periphery of the main channel 1, while the telescopic end faces downward and is connected to the sealing cover plate 2. Through its own telescopic action, the entire device can be opened and closed in a linear manner. Based on this structure, the telescopic drive mechanisms 3 are arranged around the periphery of the main channel 1, do not occupy the internal space of the main channel 1, do not cause flow disturbances inside the main channel 1, and thus reduce flow resistance.

[0025] In a possible embodiment, the driving mechanism hydraulic cylinder has a built-in piston and is connected to the sealing cover plate 2 via a piston rod. The reciprocating motion of the piston drives the sealing cover plate 2 to move up and down, thereby realizing the opening and closing of the main channel 1.

[0026] Furthermore, the boost component includes a bypass pipe 4 and a control valve 5 arranged on the bypass pipe 4. The outflow 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 inside of the main channel 1, and the inlet end of the bypass pipe 4 connects to the external fluid.

[0027] The control valve 5 is mainly used to control the on-off state of the bypass pipe 4. It can adopt 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 in a disconnected state. At this time, the internal pressure of the main channel 1 is less than the external fluid environment pressure. Under the action of this pressure difference, the sealing cover plate 2 fits tightly with the main channel 1 to achieve reliable self-sealing. Before opening the sealing cover plate 2 to connect the main channel 1, the control valve 5 controls the bypass pipe 4 to be connected, and the external fluid enters the main channel 1 through the bypass pipe 4, thereby realizing the pressurization of the main channel 1 until the internal pressure of the main channel 1 is consistent with the external fluid environment pressure. The control valve 5 controls the closure of the bypass pipe 4, and the telescopic end of the telescopic drive mechanism 3 extends to push the sealing cover plate 2 out of the main channel 1 to complete the opening work.

[0028] Furthermore, the circulation component also includes a horizontally arranged fixed main board 6, and the main channel 1 is provided with a sealing cover plate 2 at one end passing through the fixed main board 6. In a possible embodiment, the fixed main board 6 is configured as a circular plate to ensure sufficient installation space for multiple main channels 1 while reducing the weight of materials and devices. In order to increase the structural integrity and pressure resistance, the material of the fixed main board 6 is consistent with that of the main channel 1, and both are made of high-hardness metal materials. The main channel 1 is provided with a sealing cover plate 2 at one end passing through the fixed main board 6 and placed in the external fluid environment. The outer wall of the main channel 1 through which it passes forms a whole with the fixed main board 6.

[0029] In one possible embodiment, a plurality of stiffening plates are further provided on the upper surface of the fixed main board 6, and a group of stiffening plates is arranged between each two adjacent main channels 1, so that the two ends of the stiffening plates respectively abut against the outer walls of the two adjacent main channels 1 and are fixed thereto to form a whole, so as to increase the lateral shear strength of the main channel 1 in an ultra-deep use environment.

[0030] Furthermore, the fixed end of the telescopic drive mechanism 3 is fixedly arranged on the top of the fixed main board 6, 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 arranged, and its fixed end is fixed to the top surface of the fixed main board 6. There are many fixing methods, including but not limited to other methods such as interlocking connection and bolt connection. No specific restrictions are made in this application. After the telescopic end of the telescopic drive mechanism 3 longitudinally passes through the fixed main board 6, it is stably connected to the sealing cover plate 2 to realize the longitudinal position adjustment of the sealing cover plate 2.

[0031] Further, Figure 2 A structural diagram of a lifting multi-channel self-sealing opening and closing device for a sea valve provided in an embodiment of the present application is shown as follows: Figure 2 As shown, the sealing cover plate 2 includes a plate body 201 and a concave portion 202 arranged 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 board 6. In combination with the above description, the telescopic drive mechanism 3 is four groups. Therefore, in order to facilitate the positioning of the connection points of the four groups of telescopic drive mechanisms 3 and the sealing cover plate 2, and to facilitate the arrangement of the sealing cover plate 2 at the bottom of the fixed main board 6 to avoid interference between multiple sealing cover plates 2, in one embodiment of the present application, the cross-sectional configuration of the sealing cover plate 2 is a square structure. From a frontal perspective, the plate body 201 is square and the lower recess 202 is circular. From a frontal perspective, the lower recess 202 is hemispherical and the bottom of the lower recess 202 protrudes from the bottom surface of the plate body 201, so that the bottom surface of the sealing cover plate 2 has a certain curvature. The arc-shaped design of the lower recess 202 enables the sealing cover plate 2 to more evenly withstand the compression force of the fluid in the closed state, avoiding local stress concentration, thereby improving the durability and sealing performance of the sealing cover plate 2, and can also reduce the resistance when the fluid passes through, reducing turbulence and energy loss.

[0032] For further information, see Figure 2The telescopic end of the telescopic drive mechanism 3 passes through the plate body 201, and is provided with fixing nuts 301 located on the top and bottom surfaces of the plate body 201. The telescopic drive mechanism 3 is located at the four corners facing the plate body 201, and its telescopic end simultaneously passes through the fixed main plate 6 and the plate body 201. Each telescopic drive mechanism 3 is provided with two fixing nuts 301. When assembled, the two fixing nuts 301 are respectively fixed to the top and bottom surfaces of the plate body 201, facilitating adjustment of the position of the sealing cover plate 2 or maintenance and replacement.

[0033] Furthermore, the diameter of the top opening of the lower recess 202 is smaller than the diameter of the outlet end of the main channel 1. The position of the lower recess 202 corresponds to the position of the main channel 1. The outer periphery of the top opening of the lower recess 202 is provided with a fitting ring 203 protruding from the upper surface of the plate body 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.

[0034] In combination with the above description, the lower recess 202 is a hemispherical shape with an open top, and the engaging ring 203 is arranged on the outer periphery of its top. The engaging ring 203 has a certain height and the outer diameter of the engaging ring 203 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 driving mechanism 3 and approaches the main channel 1, the engaging ring 203 is tightly matched with the inner wall of the main channel 1 to form a sealing surface to block the flow of fluid. At the same time, the design of the engaging ring 203 also enables the sealing cover plate 2 to be accurately embedded in the main channel 1 when closed, ensuring accuracy and consistency when closing.

[0035] For further information, see Figure 1 The outflow end of the bypass pipe 4 passes through the outer wall of the main channel 1, and the penetration point is higher than the horizontal height of the top of the fixed end of the telescopic drive mechanism 3. In a possible embodiment, the bypass pipe 4 is arranged in an inverted L shape as a whole, including a horizontal pipe and a vertical pipe. The outflow end of the bypass pipe 4 is set on the horizontal pipe and passes through the outer wall of the main channel 1. The external fluid enters the main channel 1 through the bypass pipe 4, and in the closed state, the main channel 1 itself has fluid. Therefore, the horizontal position of the outflow end of the bypass pipe 4 is set higher, so that the external fluid needs to overcome a smaller static pressure difference when entering the main channel 1, thereby reducing the pressure at the time of inflow. The higher outflow end position can make the external fluid mix with the internal fluid of the main channel 1 in a relatively smooth 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.

[0036] Furthermore, the bypass pipe 4 can be set in a variety of ways. In one possible embodiment, an independent bypass pipe 4 is set on each main channel 1. Taking two main channels 1 as an example, the bypass pipes 4 are two independent ones. The outlet end of each bypass pipe 4 passes through the outer wall of the main channel 1 where the bypass pipe 4 is located, and the inlet end of each bypass pipe 4 is independently set and connected to the external fluid.

[0037] In another possible embodiment, 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, that is, in this embodiment, 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 two branch pipes extend from the other end. The free ends of the two branch pipes are respectively connected to the two main channels 1. However, for the sake of layout space considerations, if there are too many branch pipes, their spatial projection is larger. Therefore, in this embodiment, it is better to divide each main pipe into two branch pipes. If the number of main channels 1 is larger, multiple bypass pipes 4 are arranged, and each bypass pipe 4 is connected to the two closest main channels 1.

[0038] Furthermore, the outflow end of the bypass pipe 4 is arranged on the vertical pipe, and the fixed main board 6 serves as the boundary between the internal and external environments, with the area above the fixed main board 6 being the interior of devices such as ships and offshore platforms, and the area below the fixed main board 6 being 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.

[0039] The lifting multi-channel self-sealing opening and closing device for sea valves in the present application has the following working mechanism: 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 devices such as ships and offshore platforms, and is less than the external fluid environmental pressure. At this time, the sealing cover plate 2 is subjected to the pressing force given by the external fluid. Under the action of this pressing force, the sealing surface between the sealing cover plate 2 and the main channel fits tightly to achieve 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 pass through the bypass pipe 4 into the main channel 1, thereby increasing the internal pressure of the main channel 1, so that the pressing force of the fluid on the sealing cover plate 2 disappears, and then the telescopic drive mechanism 3 is started to push the sealing cover plate 2 away from the main channel with a linear motion trajectory.

[0040] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0042] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present 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 the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A lifting multi-channel self-sealing opening and closing device for a sea valve, characterized in that: include: A circulation assembly, the circulation assembly comprising a plurality of main channels (1) and a sealing cover plate (2) located at one end of each main channel (1) for communicating with an external fluid, the sealing cover plate (2) having a protrusion at the bottom, a plurality of groups of telescopic drive mechanisms (3) symmetrically provided on the periphery of the main channel (1), and the telescopic ends of the telescopic drive mechanisms (3) connected to the sealing cover plate (2); A boosting assembly is provided on each of the main channels (1), and the boosting assembly comprises a bypass pipe (4) and a control valve (5) provided on the bypass pipe (4); the outflow end of the bypass pipe (4) penetrates the outer wall of the main channel (1) where the bypass pipe (4) is located to communicate with the interior of the main channel (1); the inflow end of the bypass pipe (4) is connected to the external fluid.

2. A lifting multi-channel self-sealing opening and closing device for a sea valve according to claim 1, characterized in that: The circulation component further comprises a horizontally arranged fixed main plate (6), and one end of the main flow channel (1) provided with the sealing cover plate (2) passes through the fixed main plate (6).

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

4. A lifting multi-channel self-sealing opening and closing device for a sea valve according to claim 2, characterized in that: The sealing cover plate (2) comprises a plate body (201) and a recessed portion (202) arranged 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).

5. A lifting multi-channel self-sealing opening and closing device for a sea valve according to claim 4, characterized in that: The telescopic end of the telescopic drive mechanism (3) passes through the plate body (201), and the telescopic end of the telescopic drive mechanism (3) is provided with fixing nuts (301) respectively located on the top surface and the bottom surface of the plate body (201).

6. A lifting multi-channel self-sealing opening and closing device for a sea valve according to claim 5, characterized in that: The bottom end of the lower recess (202) protrudes from the bottom surface of the plate body (201) to form a protrusion, and the diameter of the top opening of the lower recess (202) is smaller than the diameter of the outflow end of the main channel (1).

7. A lifting multi-channel self-sealing opening and closing device for a sea valve according to claim 6, characterized in that: A fitting ring (203) is provided on the outer periphery of the top opening of the lower recess (202) and protrudes from the upper surface of the plate body (201), and the outer diameter of the fitting ring (203) is equal to the inner diameter of the outflow end of the main channel (1).

8. The lifting multi-channel self-sealing opening and closing device for a sea valve according to claim 4, characterized in that: The outflow end of the bypass pipe (4) penetrates the outer wall of the main channel (1), and the penetration point is higher than the horizontal height of the top of the fixed end of the telescopic drive mechanism (3).

9. A lifting multi-channel self-sealing opening and closing device for a sea valve according to claim 8, characterized in that: The inlet end of the bypass pipe (4) passes through the fixed main plate (6) and is connected to the external fluid.

10. The lifting multi-channel self-sealing opening and closing device for a sea valve according to claim 1, characterized in that: The bypass pipe (4) comprises a main pipe and a plurality of branch pipes connected to the main pipe, each branch pipe being connected to one of the main channels (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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