Underwater rotating mechanism sealing device and sealing method thereof

Abstract

The invention relates to an underwater rotating mechanism sealing device, and belongs to the field of underwater engineering sealing. The underwater rotating mechanism sealing device comprises two rotating mechanisms, and a closed containing cavity is formed between the two rotating mechanisms; the pressure compensator is connected with the closed containing cavity through a compensation oil pipe and used for being filled with oil to keep the pressure balance between the closed containing cavity and external seawater and prevent seawater from entering the closed containing cavity. The static seal is arranged on the contact surface of the end surfaces of the two rotating mechanisms and is used for preventing seawater from entering and polluting the interior; and the movable seal is arranged at the joint of the two rotating mechanisms, so that the sealing performance of the rotating mechanisms is further ensured. The sealing device has the advantages that three sealing modes of static sealing, dynamic sealing and pressure compensation are combined, the pressure compensation is used for sealing the rotating mechanism, and the rotating mechanism keeps relative balance with the external pressure no matter how the water depth changes.

Description

Technical Field

[0001] The invention relates to an underwater rotating mechanism sealing device, belonging to the sealing field of underwater engineering. Background Art

[0002] Existing hydraulic motors are usually used in land environments, and the external medium has little impact on the hydraulic motor, so a one-way seal design is usually adopted. However, when these hydraulic motors are used in underwater environments, the one-way seal cannot resist the underwater pressure, causing water to enter the hydraulic motor cavity, thereby damaging the entire hydraulic system, components and hydraulic oil.

[0003] In order to solve this problem, CN205715663U proposed a new type of underwater sealing structure for hydraulic motors. This structure arranges a two-way sealing assembly between the motor front cover and the oil distribution shaft, including a TC oil seal and a rotating Glyd ring, to cope with the pressure of the external medium on the hydraulic motor and prevent the external medium from entering the interior of the motor. However, the rotating Glyd ring used in this structure as a dynamic seal wears quickly and needs to be replaced frequently, which increases maintenance costs. Frequent replacement of seals increases the gap between the sealing surfaces and causes leakage. In addition, the Glyd ring is not suitable for occasions with high requirements for corrosion resistance, and cannot operate for a long time in a seawater environment, so its applicable occasions are limited.

[0004] On the other hand, CN211417560U proposes an underwater sealed cabin structure, in which grooves and protrusions are arranged on the side walls of the sealed cabin, the bottom of the side walls of the hatch cover and the top of the side walls of the cabin body, and the flexible sealing member is located in the groove and is squeezed and arranged between the protrusion and the side wall of the groove. This design is intended to prevent the weakening of the sealing effect caused by the long-term compression deformation of the underwater cabin body underwater, thereby increasing the service life of the cabin body.

[0005] In summary, the underwater sealing structure of the hydraulic motor in the prior art has problems such as rapid wear of the sealing components, high maintenance costs, and limited application occasions, while the underwater sealing cabin structure faces the challenge of weakening the sealing effect due to long-term compression deformation. Summary of the invention

[0006] In order to overcome the defects of the prior art, the present invention provides an underwater rotating mechanism sealing device and a sealing method thereof. The technical solution of the present invention is:

[0007] An underwater rotating mechanism sealing device comprises: two rotating mechanisms, a closed chamber is formed between the two rotating mechanisms; a pressure compensator, the pressure compensator is connected to the closed chamber through a compensating oil pipe, and is used to be filled with oil to maintain the pressure balance between the closed chamber and the external seawater, and prevent seawater from entering; a static seal is arranged on the end surface contact surface of the two rotating mechanisms, and is used to prevent seawater from entering and polluting the interior;

[0008] A dynamic seal is arranged at the connection of the two rotating mechanisms to further ensure the sealing performance of the rotating mechanisms.

[0009] The pressure compensator includes: a compensation chamber shell; a compensation oil passage, which is connected to the interior of the compensation chamber shell and is used to transmit oil; and a joint, which is used to connect the compensation oil pipe and the compensation oil passage.

[0010] The static seal is one of a metal seal, a non-metal seal, a gasket seal or a rubber seal.

[0011] The oil seal as a dynamic seal is one of a mechanical seal, a lip seal, a spiral seal or a reciprocating seal, and is used for sealing at the connection between two rotating mechanisms.

[0012] It also includes a rotation drive device, which is an electric motor or a hydraulic motor, and is used to drive the rotation mechanism.

[0013] Through three sealing forms: static sealing, dynamic sealing and pressure compensation, effective sealing of the rotating mechanism in deep sea environment can be achieved.

[0014] A method for sealing the underwater rotating mechanism comprises the following specific steps:

[0015] (1) Pressure compensation balancing steps:

[0016] First, connect the pressure compensator to the closed cavity between the two rotating mechanisms. ;

[0017] Inject oil into the closed chamber through the pressure compensator to ensure that the pressure in the chamber is balanced with the external seawater pressure;

[0018] The pressure compensator monitors the external water pressure changes in real time and automatically adjusts the oil pressure to adapt to the water pressure at different depths to prevent seawater from penetrating into the rotating mechanism due to pressure differences;

[0019] (2) Static seal setting steps:

[0020] A static seal is installed on the end contact surface of the two rotating mechanisms; wherein the static seal is made of corrosion-resistant material to ensure that seawater cannot enter the interior of the rotating mechanism through the end contact point under static conditions;

[0021] (3) Dynamic seal installation steps:

[0022] A dynamic seal is installed at the connection between the two rotating mechanisms; the dynamic seal is used to maintain the sealing performance during the relative movement of the rotating mechanisms to prevent oil leakage and seawater infiltration;

[0023] Through three sealing forms: static sealing, dynamic sealing and pressure compensation, effective sealing of the rotating mechanism in deep sea environment can be achieved.

[0024] The advantages of the present invention are:

[0025] Combining the three sealing forms of static sealing, dynamic sealing and pressure compensation, pressure compensation is used for rotating mechanism sealing. No matter how the water depth changes, the rotating mechanism maintains a relative balance with the external pressure.

[0026] It can effectively seal seawater in extremely high pressure and extremely low temperature environments to prevent damage to the equipment caused by seawater entering the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the main structure of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are exemplary only and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the scope of protection of the present invention.

[0029] See also Figure 1 The present invention relates to an underwater rotating mechanism sealing device, comprising: two rotating mechanisms, a closed cavity is formed between the two rotating mechanisms; a pressure compensator, the pressure compensator is connected to the closed cavity through a compensating oil pipe 1, and is used to be filled with oil to maintain the pressure balance between the closed cavity and the external seawater to prevent seawater from entering; a static seal 7, which is arranged on the end face contact surface of the two rotating mechanisms, and is used to prevent seawater from entering and polluting the interior; a dynamic seal 3, which is arranged at the connection between the two rotating mechanisms, and further ensures the sealing performance of the rotating mechanism.

[0030] The underwater rotating mechanism sealing device of the present invention has the following advantages:

[0031] Pressure balance: connected to the closed chamber through a pressure compensator, the internal oil pressure can be automatically adjusted to maintain a balance with the external seawater pressure. This design effectively prevents seawater from entering the closed chamber, ensuring the dryness and normal operation of the internal components.

[0032] The combination of static seals and dynamic seals provides multi-level sealing protection. The static seal is set on the end contact surface of the two rotating mechanisms to prevent seawater from entering and polluting the interior; the dynamic seal is set at the connection of the two rotating mechanisms to further ensure the sealing of the rotating mechanisms and ensure the sealing reliability under dynamic conditions.

[0033] Compact structure: The closed cavity formed between the two rotating mechanisms is compactly designed, which not only improves the space utilization but also enhances the stability of the overall structure.

[0034] Easy maintenance: As the seal device is designed with easy maintenance in mind, it is easier to replace seals and perform routine maintenance, reducing maintenance costs and time.

[0035] Strong applicability: The sealing device is suitable for various underwater environments, especially in high-pressure and corrosive environments. It can effectively protect the rotating mechanism from seawater erosion and extend the service life of the equipment.

[0036] The pressure compensator includes: a compensation chamber housing 4; a compensation oil passage 5, which is connected to the interior of the compensation chamber housing for transmitting oil; and a joint 6, which is used to connect the compensation oil pipe 1 and the compensation oil passage 5.

[0037] The structure of the pressure compensator including the compensation chamber housing, the compensation oil passage and the joint has the following advantages: the pressure compensator can sense the system pressure and adjust the flow of hydraulic oil accordingly to maintain a specific pressure level. This mechanism ensures that the system pressure remains stable even when the system operating conditions change or losses occur due to leakage, fluid temperature changes, etc.

[0038] The static seal 7 is one of a metal seal, a non-metal seal, a gasket seal or a rubber seal.

[0039] The oil seal as the dynamic seal 3 is one of a mechanical seal, a lip seal, a spiral seal or a reciprocating seal, and is used for sealing at the connection between two rotating mechanisms.

[0040] It also includes a rotation drive device 2, which is an electric motor or a hydraulic motor for driving the rotation mechanism.

[0041] Through three sealing forms: static sealing, dynamic sealing and pressure compensation, effective sealing of the rotating mechanism in deep sea environment can be achieved.

[0042] The present invention also relates to a method for sealing an underwater rotating mechanism, comprising the following specific steps:

[0043] Pressure compensation balance steps:

[0044] First, a pressure compensator is connected to the closed volume between the two rotating mechanisms.

[0045] Oil is injected into the closed chamber through the pressure compensator to ensure that the pressure in the chamber is balanced with the external seawater pressure.

[0046] The pressure compensator monitors the changes in external water pressure in real time and automatically adjusts the oil pressure to adapt to the water pressure at different depths, preventing seawater from penetrating into the rotating mechanism due to pressure differences.

[0047] Static seal setting steps:

[0048] A static seal is installed on the end contact surface of the two rotating mechanisms.

[0049] Select static seals made of corrosion-resistant materials to ensure that seawater cannot enter the rotating mechanism through the end face contact points under static conditions.

[0050] Static seals are designed to have sufficient elasticity and durability to adapt to the special requirements of the underwater environment and maintain good sealing performance when subjected to external pressure.

[0051] Dynamic seal installation steps:

[0052] An oil seal is installed at the connection of the two rotating mechanisms as a dynamic seal.

[0053] Dynamic seals are designed to maintain sealing performance during the relative motion of rotating mechanisms, prevent oil leakage and seawater infiltration, and enable dynamic seals to withstand the friction and wear generated by rotating motion while maintaining an efficient sealing effect.

[0054] The working principle of the underwater rotating mechanism sealing device of the present invention combines three sealing modes of static sealing, dynamic sealing and pressure compensation to ensure effective sealing in a deep sea environment.

[0055] Function of the pressure compensator: The pressure compensator is connected to the closed chamber between the two rotating mechanisms through a compensating oil pipe. The compensator is filled with oil to keep the pressure in the closed chamber balanced with the pressure of the external seawater. This pressure balancing mechanism prevents seawater from entering the rotating mechanism due to pressure difference.

[0056] Function of static seal: A static seal is set on the end contact surface of the two rotating mechanisms. This static seal is used to prevent seawater from entering the rotating mechanism through the end contact point, thereby protecting the internal components from seawater corrosion.

[0057] Function of dynamic seal: An oil seal is set at the connection of two rotating mechanisms as a dynamic seal. This dynamic seal ensures that the sealing performance is maintained during the relative movement of the rotating mechanism, preventing oil leakage and seawater infiltration.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An underwater rotating mechanism sealing device, characterized in that: include: Two rotating mechanisms, forming a closed cavity between the two rotating mechanisms; a pressure compensator, the pressure compensator being connected to the closed chamber via a compensating oil pipe (1) and being used to be filled with oil to maintain pressure balance between the closed chamber and external seawater to prevent seawater from entering; A static seal (7) is provided on the end contact surfaces of the two rotating mechanisms to prevent seawater from entering and contaminating the interior; A dynamic seal (3) is arranged at the connection between the two rotating mechanisms to further ensure the sealing performance of the rotating mechanisms.

2. The underwater rotating mechanism sealing device according to claim 1, characterized in that: The pressure compensator comprises: a compensating cavity housing (4); a compensation oil passage (5), the compensation oil passage being in communication with the interior of the compensation cavity housing and being used for transmitting oil; A joint (6) is used to connect the compensation oil pipe (1) and the compensation oil channel (5).

3. The underwater rotating mechanism sealing device according to claim 1, characterized in that: The static seal (7) is one of a metal seal, a non-metal seal, a gasket seal or a rubber seal.

4. The underwater rotating mechanism sealing device according to claim 1, characterized in that: The oil seal as a dynamic seal (3) is one of a mechanical seal, a lip seal, a spiral seal or a reciprocating seal, and is used for sealing at the connection between two rotating mechanisms.

5. The underwater rotating mechanism sealing device according to claim 3 or 4, characterized in that: It also includes a rotation drive device (2), which is an electric motor or a hydraulic motor and is used to drive the rotation mechanism.

6. The underwater rotating mechanism sealing device according to claim 5, characterized in that: Through three sealing forms: static sealing, dynamic sealing and pressure compensation, effective sealing of the rotating mechanism in deep sea environment can be achieved.

7. A method for sealing an underwater rotating mechanism according to any one of claims 1 to 6, characterized in that: The specific steps include: (1) Pressure compensation balancing steps: First, connect the pressure compensator to the closed cavity between the two rotating mechanisms. ; Inject oil into the closed chamber through the pressure compensator to ensure that the pressure in the chamber is balanced with the external seawater pressure; The pressure compensator monitors the external water pressure changes in real time and automatically adjusts the oil pressure to adapt to the water pressure at different depths to prevent seawater from penetrating into the rotating mechanism due to pressure differences; (2) Static seal setting steps: A static seal is installed on the end contact surface of the two rotating mechanisms; wherein the static seal is made of corrosion-resistant material to ensure that seawater cannot enter the interior of the rotating mechanism through the end contact point under static conditions; (3) Dynamic seal installation steps: A dynamic seal is installed at the connection between the two rotating mechanisms; the dynamic seal is used to maintain the sealing performance during the relative movement of the rotating mechanisms to prevent oil leakage and seawater infiltration; Through three sealing forms: static sealing, dynamic sealing and pressure compensation, effective sealing of the rotating mechanism in deep sea environment can be achieved.

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