Pressure balancing rotating device and pressure balancing method

Abstract

The present invention relates to a pressure balancing rotating device and a pressure balancing method, comprising an upper cylinder body and a lower cylinder body arranged coaxially, a piston being inserted in the lower cylinder body; the upper cylinder body and the lower cylinder body are connected to form an upper chamber between the upper cylinder body and the lower cylinder body, and a lower chamber between the lower cylinder body and the piston; an inner ring sealing component and an outer ring sealing component are installed in the upper chamber; a coaxiality maintaining component is installed between the inner ring sealing component and the outer ring sealing component; and the upper chamber body and the lower chamber are sealed and isolated from the external environment. The present invention can meet the requirements of the pressure-resistant cabin for sealing and rotation. The upper cylinder body and the lower cylinder body can rotate relative to each other, and the lower cylinder body and the piston can slide relative to each other. In addition to having a sealing structure to prevent leakage, the upper cylinder body and the lower cylinder body are also provided with a coaxiality maintaining component with a supporting function. It is ensured that the upper cylinder body and the lower cylinder body are not prone to tilt angles when they rotate relative to each other, thereby ensuring the coaxial accuracy and the smoothness of rotation.

Description

Technical Field

[0001] The invention relates to the technical field of underwater sealing, in particular to a pressure balancing rotating device and a pressure balancing method. Background Art

[0002] In some underwater engineering equipment, conventional rotary dynamic seals cannot meet the use requirements of some specific occasions due to the large rotational torque. The function of the pressure balance rotary device is to achieve reliable sealing and flexible rotation, and the rotational torque is usually less than 25Nm. The pressure balance rotary device usually contains liquid inside, which is used to protect the device from damage and also acts as a lubricant.

[0003] However, the existing pressure balancing rotating device has the following disadvantages:

[0004] 1. The seal is unreliable; 2. The rotational torque is too large; 3. The components are prone to getting stuck. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a pressure balancing rotating device and a pressure balancing method with a reasonable structure, which can provide a reliable sealing structure and ensure that the structure can rotate smoothly with stable and appropriate torque.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A pressure balancing rotating device comprises an upper cylinder body and a lower cylinder body which are coaxially arranged, wherein a piston is penetrated in the lower cylinder body; the upper cylinder body and the lower cylinder body are connected to form an upper chamber between the upper cylinder body and the lower cylinder body, and a lower chamber between the lower cylinder body and the piston.

[0008] The upper chamber is provided with an inner ring sealing assembly and an outer ring sealing assembly, and a coaxiality maintaining assembly is provided between the inner ring sealing assembly and the outer ring sealing assembly.

[0009] The upper cavity, the lower cavity and the external environment are sealed and isolated.

[0010] As a further improvement of the above technical solution:

[0011] The upper cylinder body is provided with a coaxial outer annular groove and an inner annular groove, the inner ring sealing assembly is installed in the inner annular groove, and the outer ring sealing assembly is installed in the outer annular groove.

[0012] A plurality of countersunk holes are provided on the top walls of the inner annular groove and the outer annular groove.

[0013] The inner ring sealing assembly comprises:

[0014] The inner ring knife is located in the inner ring groove.

[0015] The inner ring spring is installed in the countersunk hole on the top wall of the inner annular groove.

[0016] The inner sealing ring falls on the top surface of the lower cylinder body, and the inner annular knife contacts the inner sealing ring.

[0017] The outer ring sealing assembly comprises:

[0018] The outer ring cutter is located in the outer ring groove.

[0019] The outer ring spring is installed in the countersunk hole on the top wall of the outer annular groove.

[0020] The outer sealing ring falls on the top surface of the lower cylinder body, and the outer annular knife abuts against the outer sealing ring.

[0021] An upper sealing ring is filled between the outer annular knife, the inner annular knife and the upper cylinder body; and a lower sealing ring is filled between the inner sealing ring, the outer sealing ring and the lower cylinder body.

[0022] The upper sealing ring applies a pushing force to the annular knife, and the lower sealing ring applies a pushing force to the sealing ring, and the two directions are opposite.

[0023] The coaxiality maintaining component comprises:

[0024] The upper annular body and the lower annular body are located in the upper cylinder body and in the space between the inner ring sealing component and the outer ring sealing component.

[0025] The ball is located between the upper annular body and the lower annular body; the opposite surfaces of the upper annular body and the lower annular body are provided with protrusions, and the area surrounded by the adjacent protrusions in the axial direction is used to accommodate the ball.

[0026] The top and bottom ends of the upper annular body are chamfered to form a conical surface, and a failure protection sealing ring is arranged at the conical surface.

[0027] The oil side contact approach angle β of the outer annular knife is greater than the water side approach angle α; the right side contact approach angle β of the inner annular knife is greater than the air side contact angle γ.

[0028] A pressure balancing method using a pressure balancing rotating device comprises the following steps:

[0029] Under external pressure, the piston moves axially and extends into the lower cylinder, pressurizing the liquid in the chamber.

[0030] At the same time, the spring presses the inner and outer annular knives toward the inner and outer sealing rings to achieve knife tip sealing.

[0031] The ball bearings ensure that the upper and lower cylinder bodies rotate coaxially.

[0032] When the tip seal fails, the hydraulic oil leaks out. At this time, the external water pressure acts on the piston and the upper cylinder, pushing the piston and the lower cylinder to the upper cylinder. The spring is compressed, and the opposite surfaces of the upper and lower cylinders are close to each other, forming a protective structure when the seal fails.

[0033] When the lower surface of the upper annular body contacts the upper surface of the lower cylinder body, the relative movement between the two stops, and the conical surface of the upper annular body presses the failure protection sealing ring. At this time, the conical surface and the corresponding failure protection sealing ring form a new sealing barrier to prevent seawater from penetrating into the structure. At the same time, the entire device is locked.

[0034] The beneficial effects of the present invention are as follows:

[0035] The invention has a compact and reasonable structure and is easy to operate, and can meet the requirements of the pressure-resistant cabin for sealing and rotation.

[0036] In the present invention, the upper cylinder body and the lower cylinder body can rotate relative to each other, and the lower cylinder body and the piston can slide relative to each other. In addition to the sealing structure between the upper cylinder body and the lower cylinder body to prevent leakage, a coaxiality maintaining component with a supporting function is also provided. The coaxiality maintaining component can ensure that the upper cylinder body and the lower cylinder body are not prone to tilt angles when they rotate relative to each other, thereby ensuring the coaxial accuracy and the smoothness of rotation.

[0037] When the sealing structure of the present invention fails, the external seawater pressure can push the entire device, and the inclined surface of the annular body and the failure protection sealing ring are used to form a failure protection structure to prevent subsequent leakage, thereby effectively preventing seawater from entering the interior of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a specific structural cross-sectional view of the present invention.

[0039] Figure 2 It is a schematic diagram of the upper cylinder body and the lower cylinder body of the present invention moving to a fitting state.

[0040] Figure 3 Schematic diagram of the possible inclination state of a single-row ball structure.

[0041] Figure 4 It is a schematic diagram of the double-row ball structure of the present invention.

[0042] Figure 5 It is a schematic diagram of the angle requirements of the present invention.

[0043] Among them: 1. Upper cylinder body; 2. Lower cylinder body; 3. Piston; 4. Inner ring sealing assembly; 5. Outer ring sealing assembly; 6. Coaxiality maintaining assembly;

[0044] 101, upper chamber; 102, outer annular groove; 103, inner annular groove;

[0045] 201, lower chamber;

[0046] 401, inner annular knife; 402, inner ring spring; 403, inner sealing ring; 404, upper sealing ring;

[0047] 501, outer annular knife; 502, outer ring spring; 503, outer sealing ring; 504, lower sealing ring;

[0048] 601, upper annular body; 602, lower annular body; 603, ball bearing; 604, top cover; 605, failure protection sealing ring. DETAILED DESCRIPTION

[0049] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0050] like Figure 1-Figure 5 As shown, the pressure balancing rotating device of this embodiment includes an upper cylinder body 1 and a lower cylinder body 2 which are coaxially arranged, and a piston 3 is inserted into the lower cylinder body 2; the upper cylinder body 1 and the lower cylinder body 2 are connected to form an upper chamber 101 between the upper cylinder body 1 and the lower cylinder body 2, and a lower chamber 201 between the lower cylinder body 2 and the piston 3.

[0051] An inner ring sealing assembly 4 and an outer ring sealing assembly 5 are installed in the upper chamber 101, and a coaxiality maintaining assembly 6 is installed between the inner ring sealing assembly 4 and the outer ring sealing assembly 5.

[0052] The upper cavity, the lower cavity and the external environment are sealed and isolated.

[0053] The upper cylinder body 1 is provided with a coaxial outer annular groove 102 and an inner annular groove 103. The inner ring seal assembly 4 is installed at the inner annular groove 103, and the outer ring seal assembly 5 is installed at the outer annular groove 102.

[0054] A plurality of countersunk holes are formed on the top walls of the inner annular groove 103 and the outer annular groove 102 .

[0055] The inner ring seal assembly 4 includes:

[0056] The inner annular knife 401 is located in the inner annular groove 103.

[0057] The inner ring spring 402 is installed in the countersunk hole on the top wall of the inner annular groove 103.

[0058] The inner sealing ring 403 falls on the top surface of the lower cylinder body 2 , and the inner annular knife 401 abuts against the inner sealing ring 403 .

[0059] The outer ring sealing assembly 5 comprises:

[0060] The outer annular knife 501 is located in the outer annular groove 102.

[0061] The outer ring spring 502 is installed in the countersunk hole on the top wall of the outer annular groove 102.

[0062] The outer sealing ring 503 falls on the top surface of the lower cylinder body 2 , and the outer annular knife 501 abuts against the outer sealing ring 503 .

[0063] An upper sealing ring 404 is filled between the outer annular knife 501 , the inner annular knife 401 and the upper cylinder body 1 ; a lower sealing ring 504 is filled between the inner sealing ring 403 , the outer sealing ring 503 and the lower cylinder body 2 .

[0064] The upper sealing ring 404 applies a pushing force to the annular knife, and the lower sealing ring 504 applies a pushing force to the sealing ring, and the two directions are opposite.

[0065] The coaxiality maintaining component 6 comprises:

[0066] The upper annular body 601 and the lower annular body 602 are located in the upper cylinder body 1 and in the space between the inner ring sealing assembly 4 and the outer ring sealing assembly 5.

[0067] The ball 603 is located between the upper annular body 601 and the lower annular body 602 . The upper annular body 601 and the lower annular body 602 have protrusions on their opposite surfaces, and the area surrounded by adjacent protrusions in the axial direction is used to accommodate the ball 603 .

[0068] The top and bottom ends of the upper annular body 601 are chamfered to form a conical surface, and a failure protection sealing ring 605 is provided at the conical surface.

[0069] The oil-side contact approach angle β of the outer annular blade 501 is greater than the water-side contact angle α; the right-side contact approach angle β of the inner annular blade 401 is greater than the air-side contact angle γ.

[0070] The pressure balancing method using the pressure balancing rotating device of this embodiment includes the following steps:

[0071] Under external pressure, the piston 3 moves axially and extends into the lower cylinder 2 to pressurize the liquid in the chamber.

[0072] At the same time, the spring presses the inner annular knife 401 and the outer annular knife 501 toward the inner sealing ring 403 and the outer sealing ring 503 to achieve knife tip sealing.

[0073] The ball 603 ensures that the upper cylinder 1 and the lower cylinder 2 rotate in a coaxial state.

[0074] When the tip seal fails, the hydraulic oil leaks out. At this time, the external water pressure acts on the piston 3 and the upper cylinder 1, pushing the piston 3 and the lower cylinder 2 toward the upper cylinder 1. The spring is compressed, and the opposite surfaces of the upper cylinder 1 and the lower cylinder 2 are close to each other, forming a protective structure when the seal fails.

[0075] When the lower surface of the upper annular body 601 contacts the upper surface of the lower cylinder body 2, the relative movement between the two stops, and the conical surface of the upper annular body 601 presses the failure protection sealing ring 605. At this time, the conical surface and the corresponding failure protection sealing ring 605 form a new sealing barrier to prevent seawater from penetrating into the structure. At the same time, the entire device is locked.

[0076] The specific structure and working principle of the present invention are as follows:

[0077] Reference Figure 1 As shown, the pressure balancing rotating device is mainly composed of three annular components, namely, an upper cylinder body 1, a lower cylinder body 2 and a piston 3.

[0078] The upper cylinder body 1 and the lower cylinder body 2 can realize relative rotation, and the lower cylinder body 2 and the piston 3 can realize relative movement along the axial direction.

[0079] An upper chamber 101 is formed between the upper cylinder body 1 and the lower cylinder body 2 , and a lower chamber 201 is formed between the lower cylinder body 2 and the piston 3 .

[0080] The interior of the upper cylinder body 1 includes an outer annular groove 102 and an inner annular groove 103. A large number of countersunk holes are drilled in the upper ends of the inner annular groove 103 and the outer annular groove 102 along the circumferential direction for installing springs.

[0081] The outer annular blade 501 and the outer sealing ring 503 are used to seal the outside of the device and the upper chamber 101 of the device.

[0082] The inner annular blade 401 and the inner sealing ring 403 are used to seal the interior of the device and the upper chamber 101 of the device.

[0083] Two upper sealing rings 404 are installed in the annular grooves of the outer annular knife 501 and the inner annular knife 401 ; two lower sealing rings 504 are installed in the grooves of the lower cylinder body 2 for installing the inner sealing ring 403 and the outer sealing ring 503 .

[0084] The upper annular body 601 is connected to the upper cylinder body 1 through a thread, and the lower annular body 602 is connected to the lower cylinder body 2 through a thread. A protruding step structure is formed on the opposite surfaces of the upper annular body 601 and the lower annular body 602, so that there is a space between the upper annular body 601 and the lower annular body 602 for accommodating the balls 603. The balls 603 are arranged in two rows, and the two rows of balls 603 are used to maintain the relative position of the upper cylinder body 1 and the lower cylinder body 2.

[0085] The function of the lower row of balls 603 is to maintain the relative position of the upper cylinder body 1 and the lower cylinder body 2, and to ensure the coaxiality of the upper cylinder body 1 and the lower cylinder body 2 in the vertical direction. The function of the upper row of balls 603 is to ensure that there is no tilt between the upper cylinder body 1 and the lower cylinder body 2.

[0086] A top cover 604 connected to the top of the lower annular body 602 is installed above the upper row of balls 603. The top cover 604 is used to limit the upper row of balls 603 from deviating from the track on which they are located.

[0087] In this way, a precision support system consisting of the upper annular body 601, the lower annular body 602 and the double-row bearing balls 603 is formed. This system can ensure the coaxiality of the upper cylinder body 1 and the lower cylinder body 2 when they rotate, and at the same time ensure that the upper cylinder body 1 and the lower cylinder body 2 will not tilt when they rotate. The working principle is described in detail below:

[0088] Under the preload force of the outer ring spring, the tip of the outer ring knife 501 contacts the outer sealing ring 503 to form the outer ring sealing component 5 of the device.

[0089] Under the preload force of the inner ring spring 402, the tip of the inner annular knife 401 contacts the inner sealing ring 403 to form the inner ring sealing structure of the device.

[0090] The outer ring seal and inner ring seal here are collectively referred to as the first sealing system.

[0091] The relatively narrow blade contact area, coupled with a reasonable precision support system: the coaxiality maintaining assembly 6 formed by the upper annular body 601, the lower annular body 602, the upper row of balls 603, and the lower row of balls 603 can reduce the rotational torque, allowing the pressure balancing rotating device to rotate flexibly under greater external pressure.

[0092] An upper sealing ring 404 with a larger diameter is placed in the groove of the upper cylinder body 1 to seal the gap between the outer annular knife 501 and the upper cylinder body 1;

[0093] An upper sealing ring 404 with a smaller diameter is placed in the groove of the upper cylinder body 1 to seal the gap between the inner annular knife 401 and the upper cylinder body 1 .

[0094] The two upper sealing rings 404 allow the outer annular knife 501 and the inner annular knife 401 to move axially. The upper sealing ring 404, the lower sealing ring 504, the tip of the outer annular knife 501, the tip of the inner annular knife 401, the outer sealing ring 503, and the inner sealing ring 403 together seal the upper chamber 101.

[0095] The lower surface of the lower cylinder body 2 is a large annular groove, which forms a closed lower chamber 201 with the upper surface of the piston 3 .

[0096] The lower chamber 201 is connected to the aforementioned upper chamber 101 through a channel, which ensures that the liquid pressure values ​​in the upper and lower chambers 201 are equal.

[0097] At the same time, the inner and outer cylindrical surfaces of the upper chamber 101 have the same nominal diameters as the inner and outer cylindrical surfaces of the lower chamber 201, so that the upper and lower surfaces of the lower cylinder body 2 are subjected to equal pressure values, thereby ensuring that the lower cylinder body 2 will not be subjected to axial forces other than the elastic force of the spring.

[0098] The piston 3 is provided with a groove for accommodating an O-ring, which constitutes a second sealing system.

[0099] The piston 3 can freely move axially in the annular groove on the lower surface of the lower cylinder body 2, so that the seawater pressure in the hydraulic chamber and the environment outside the device can be balanced. The hydraulic chamber is a general term for the upper chamber 101 and the lower chamber 201.

[0100] Combining the pressure balancing rotating device described above, the upper sealing ring 404 of the upper cylinder body 1, the two knife tip seals of the upper cylinder body 1, the inner sealing ring 403 and the outer sealing ring 503 of the lower cylinder body 2, the lower sealing ring 504 of the lower cylinder body 2, and the O-ring seal of the piston 3 form an entire rotating seal.

[0101] Therefore, the axial load acting on the pressure balancing rotating device will be entirely borne by the liquid in the upper chamber 101 and the lower chamber 201 .

[0102] When the pressure oil leaks from the knife edge, the lower cylinder 2 will move closer to the upper cylinder 1, and the fail-safe sealing ring 605 in the standby state will start sealing, and combined with other sealing rings, they will seal the inside of the diving equipment.

[0103] In normal working condition, if Figure 1 Under external pressure, the piston 3 will move axially in the annular cylinder at the lower part of the lower cylinder body 2, thereby pressurizing the liquid in the upper chamber 101 and the lower chamber 201, thus forming the hydraulic bearing ball 603.

[0104] The external pressure exerted on the piston 3 will directly act on the pressure liquid in the upper chamber 101 and the lower chamber 201 .

[0105] The piston 3 and the lower cylinder 2 of the device are allowed to move relative to each other in the axial direction, and the upper cylinder 1 and the lower cylinder 2 are allowed to rotate relative to each other, but axial movement and tilting are not allowed. This is ensured by the double-row balls 603. Therefore, the knife tip sealing structure becomes more reliable.

[0106] If a single-row ball bearing 603 design is adopted, the spring force generated by the spring acting on the blade is not a rigid constraint. When an asymmetric external force exists, the upper cylinder body 1 and the lower cylinder body 2 will rotate with the center of the bearing ball bearing 603 as the center of the circle, generating a relative rotation angle, such as Figure 3 As shown, the upper cylinder body 1 and the lower cylinder body 2 are tilted, which causes the rotating shafts to not overlap, resulting in excessive torque or even leakage.

[0107] The design of this patent is as follows Figure 4 As shown, the upper row of balls 603 and the lower row of balls 603 and their tracks can ensure good rotation coaxiality of the upper cylinder body 1 and the lower cylinder body 2. The function of the top cover 604 is to maintain the working position of the upper row of balls 603, and the top cover 604 will not be subjected to large axial force during operation.

[0108] When any part of the first sealing system is damaged, such as Figure 2 As shown, the hydraulic oil in the hydraulic chamber will flow out of the hydraulic chamber. This is because the external water pressure acts on the piston 3 and the upper cylinder body 1, generating a considerable axial force to press the upper cylinder body 1 and the piston 3.

[0109] When the liquid leaks out from the knife edge of the hydraulic chamber, as the liquid in the chamber decreases, the lower cylinder body 2 will move toward the upper cylinder body 1 under the seawater pressure. This forms a protective structure for knife edge seal failure.

[0110] When the lower surface of the upper annular body 601 contacts the upper surface of the lower cylinder body 2, their relative motion stops. At the same time, the conical surfaces at both ends of the upper annular body 601 in the axial direction will compress the failure protection sealing ring 605.

[0111] The contact between the conical surfaces at both ends of the upper annular body 601 and the failure protection sealing ring 605 corresponding to the conical surfaces forms a new sealing barrier, which can effectively prevent external seawater from entering the device, and the device cannot rotate at the same time.

[0112] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A pressure balancing rotating device, characterized in that: The invention comprises an upper cylinder body (1) and a lower cylinder body (2) which are coaxially arranged, wherein a piston (3) is inserted into the lower cylinder body (2); the upper cylinder body (1) and the lower cylinder body (2) are connected to form an upper chamber (101) between the upper cylinder body (1) and the lower cylinder body (2), and a lower chamber (201) between the lower cylinder body (2) and the piston (3). An inner ring sealing assembly (4) and an outer ring sealing assembly (5) are installed in the upper chamber (101), and a coaxiality maintaining assembly (6) is installed between the inner ring sealing assembly (4) and the outer ring sealing assembly (5). The upper cavity, the lower cavity and the external environment are sealed and isolated; The coaxiality maintaining component (6) comprises: The upper annular body (601) and the lower annular body (602) are located in the upper cylinder body (1) and in the space between the inner ring sealing assembly (4) and the outer ring sealing assembly (5). The balls (603) are double-row balls (603) and are located between the upper annular body (601) and the lower annular body (602). The upper annular body (601) and the lower annular body (602) are provided with protrusions on the opposite surfaces thereof, and the area enclosed by the adjacent protrusions in the axial direction is used to accommodate the balls (603). The upper cylinder body (1) is provided with a coaxial outer annular groove (102) and an inner annular groove (103); the inner ring sealing assembly (4) is installed at the inner annular groove (103); and the outer ring sealing assembly (5) is installed at the outer annular groove (102). A plurality of countersunk holes are provided on the top walls of the inner annular groove (103) and the outer annular groove (102); The inner ring sealing assembly (4) comprises: The inner annular knife (401) is located in the inner annular groove (103). The inner ring spring (402) is installed in the countersunk hole on the top wall of the inner annular groove (103). The inner sealing ring (403) falls on the top surface of the lower cylinder body (2), and the inner annular knife (401) abuts against the inner sealing ring (403); The outer ring sealing assembly (5) comprises: The outer annular knife (501) is located in the outer annular groove (102). The outer ring spring (502) is installed in the countersunk hole on the top wall of the outer annular groove (102). The outer sealing ring (503) falls on the top surface of the lower cylinder body (2), and the outer annular knife (501) abuts against the outer sealing ring (503); The top and bottom ends of the upper annular body (601) are chamfered to form a conical surface, and a failure protection sealing ring (605) is provided at the conical surface.

2. The pressure-balanced rotating device according to claim 1, characterized in that: An upper sealing ring (404) is filled between the outer annular knife (501), the inner annular knife (401) and the upper cylinder body (1); and a lower sealing ring (504) is filled between the inner sealing ring (403), the outer sealing ring (503) and the lower cylinder body (2).

3. The pressure-balanced rotating device according to claim 2, characterized in that: The upper sealing ring (404) applies a pushing force to the annular knife, and the lower sealing ring (504) applies a pushing force to the sealing ring, and the two forces are in opposite directions.

4. A pressure balancing method using the pressure balancing rotating device according to claim 1, characterized in that: The steps include: Under external pressure, the piston (3) moves axially and extends into the lower cylinder (2), pressurizing the liquid in the chamber. At the same time, the spring presses the inner annular knife (401) and the outer annular knife (501) toward the inner sealing ring (403) and the outer sealing ring (503) to achieve knife tip sealing. The ball bearing (603) ensures that the upper cylinder body (1) and the lower cylinder body (2) rotate in a coaxial state. When the tip seal fails, hydraulic oil leaks out. At this time, the external water pressure acts on the piston (3) and the upper cylinder (1), pushing the piston (3) and the lower cylinder (2) toward the upper cylinder (1). The spring is compressed, and the opposing surfaces of the upper cylinder (1) and the lower cylinder (2) are brought close to each other, forming a protective structure when the seal fails. When the lower surface of the upper annular body (601) contacts the upper surface of the lower cylinder body (2), the relative movement between the two stops, and the conical surface of the upper annular body (601) presses the failure protection sealing ring (605). At this time, the conical surface and the corresponding failure protection sealing ring (605) form a new sealing barrier to prevent seawater from penetrating into the structure. At the same time, the entire device is locked.

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