An adjustable ship propeller rotary seal oil pressure compensation device

Abstract

The application discloses an adjustable ship propeller rotation sealing oil pressure compensation device, which comprises a shell, a plug, a screw rod, a screw rod support, a sleeve, a spring and a spring support, the screw rod support is fixed on the upper part of the shell, the plug, the sleeve and a sealing ring are arranged in the shell, the screw rod is connected with the spring support through the sleeve, the upper part of the plug is connected with the sleeve, and the lower part of the plug is provided with the sealing ring; when in use, the shell is installed on an oil delivery pipeline of a sealing oil tank, when oil is supplied, sealing oil enters from one end of the device and flows out from the other end, the required acceleration of the up-down movement of the sleeve in the shell can be changed by adjusting the compression amount of the spring through the screw rod, when the propeller is subjected to a larger acceleration, the sleeve and the plug move to the sealing position of the oil outlet of the shell, the pipeline is closed, and sealing oil leakage is reduced.

Description

Technical Field

[0001] This invention belongs to the field of rotary seal technology for ship propellers, and specifically relates to an adjustable rotary seal oil pressure compensation device for ship propellers. Background Technology

[0002] To lubricate the bearings of ship propellers, gravity oil tanks are typically installed inside the ship or propeller. These tanks supply oil to the bearing cavity using gravity, and the rotary seal withstands the pressure of both seawater and the oil tank, preventing leakage of both. Under normal navigation conditions, the oil pressure and seawater pressure are balanced. However, when the ship is affected by wind and waves, or when navigating through ice-covered areas and encountering ice, the ship's up-and-down motion causes changes in the vertical acceleration of the gravity oil tank. This results in pressure increases or decreases in the gravity oil tank and its pipelines, disrupting the pressure balance between the oil and seawater, and ultimately leading to significant lubricant leakage.

[0003] To address the problem of excessive lubricating oil leakage from the gravity oil tanks of ship propellers, the current method is to periodically refill the gravity oil tanks to maintain them in normal working condition. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by designing an adjustable rotary seal oil pressure compensation device for ship propellers, thereby solving the problem of large leakage of sealing oil at the rotary seal when the existing ship propellers are subjected to vertical acceleration.

[0005] The technical solution adopted by this invention to solve its technical problem is: an adjustable rotary sealing oil pressure compensation device for a ship propeller, comprising a housing and a screw support installed at the top opening of the housing. A sleeve is provided inside the housing, and a plug and a sealing ring are provided on the lower end face of the sleeve. The sleeve, plug, and sealing ring are arranged in a movable cavity formed by the screw support and the housing. The plug is fixedly installed at the lower opening of the sleeve, and the sealing ring is located below the plug for sealing the plug against the inner surface of the housing. A screw is installed on the screw support, and a spring support connected to the screw is provided inside the sleeve. A spring is sleeved on the screw between the spring support and the screw support, and the spring is located in the cavity formed by the spring support and the upper part of the sleeve. An oil outlet is provided at the bottom of the housing, and an oil inlet is provided on the side wall of the housing between the sealing ring and the oil outlet. When in use, this patented sealing oil pressure compensation device is installed vertically on the oil supply pipeline of the sealing oil tank through the housing. Multiple compensation devices of this patent can be installed on the oil supply pipeline. When the thruster is not subjected to vertical acceleration, the sleeve and plug move vertically upward under the action of the spring. When the thruster is subjected to a large acceleration, the sleeve and plug move in the opposite direction of the acceleration, sealing the oil passage.

[0006] The adjustable rotary sealing hydraulic pressure compensation device for a ship propeller has a through hole on the upper end face of the sleeve for the lead screw to pass through. The lower end of the lead screw passes through the through hole and is connected to the spring support. The sleeve is provided with a convex ring that seals against the inner surface of the housing. In this way, while the convex ring and the housing form a seal, it can move freely up and down in the cavity formed below the lead screw support and above the oil outlet of the housing.

[0007] An adjustable rotary sealing hydraulic pressure compensation device for a ship propeller has a downwardly extending frustum on the lower end face of its plug, and the sealing ring is mounted on the frustum; a thrust surface that seals with the frustum and the sealing ring is provided at the corresponding position of the oil outlet on the inner surface of the housing.

[0008] The adjustable rotary seal hydraulic pressure compensation device for a ship propeller has a lead screw and a spring support connected by threads. When the lead screw rotates under the drive of an external motor, the spring support can move up and down along the lead screw to compress the spring, thereby changing the acceleration required for the sleeve and plug to move downward.

[0009] The adjustable rotary seal hydraulic pressure compensation device for a ship propeller has annular mounting ribs and mounting grooves that cooperate with the spring at corresponding positions on the sleeve and spring support.

[0010] The adjustable rotary seal hydraulic pressure compensation device for a ship propeller has an oil inlet pipe and an oil outlet pipe extending outward from its housing.

[0011] The beneficial effects of this invention are: when the thruster experiences a large acceleration, the sleeve and plug of this patented hydraulic pressure compensation device move to seal the oil pipeline, thereby reducing the leakage of sealing oil. Depending on the design working pressure requirements, several of these hydraulic pressure compensation devices can be installed on the oil pipeline to further reduce sealing oil leakage. This patented hydraulic pressure compensation device, by rotating the lead screw, can change the compression of the spring, thereby adjusting the acceleration required for the sleeve and plug to move downwards and seal the oil pipeline. This patented hydraulic pressure compensation device is lightweight, relies on system acceleration for sealing, is safe and reliable, and is easy to assemble and use. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention;

[0013] Figure 2 and Figure 3 This is a schematic diagram showing the connection between the sleeve and the plug of the present invention;

[0014] Figure 4 This is a schematic diagram of the seal when the present invention is subjected to acceleration;

[0015] Figure 5 This is a schematic diagram of the oil flow after adjusting the acceleration according to the present invention.

[0016] The labels on the attached drawings are as follows: 1—lead screw, 2—lead screw support, 3—sleeve, 31—through hole, 32—convex ring, 4—spring, 5—spring support, 6—plug, 7—sealing ring, 8—housing. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention will be clearly and completely described.

[0018] Reference Figure 1 As shown, this invention discloses an adjustable rotary sealing hydraulic pressure compensation device for a ship propeller, comprising a lead screw 1, a lead screw support 2, a sleeve 3, a spring 4, a spring support 5, a plug 6, a sealing ring 7, and a housing 8. The cross-sectional shape of the housing 8 can be designed according to the actual oil pipeline requirements. The upper profile of the housing 8 has a larger cross-sectional area for mounting the lead screw support 2, forming a cavity with the housing 8 and the lead screw support 2. The lower profile of the housing 8 has a smaller cross-sectional area to form a sealing port with the frustum-shaped structure of the plug 6.

[0019] like Figure 2 and Figure 3 As shown, a plug 6 is installed at the lower opening of the sleeve 3. The sleeve 3 and the plug 6 are placed in the cavity formed by the lead screw support 2 and the lower end of the housing 8. The sleeve 3 and the plug 6 can move freely up and down in the cavity, and the convex ring 32 on the outside of the sleeve 3 forms a seal with the housing 8.

[0020] The lower part of the plug 6 is a truncated cone structure. The outer diameter of the plug 6 is larger than the inner diameter of the sealing port at the bottom of the housing 8. When the plug 6 reaches the sealing position, it can ensure reliable sealing and achieve reliable isolation of the oil pipeline.

[0021] The sealing ring 7 is located below the plug 6. Both are inverted conical in shape and are used to seal the plug 6 against the inner surface of the housing 8.

[0022] The spring support 5 is disposed inside the sleeve 3. The outer diameter of the spring support 5 is smaller than the inner diameter of the sleeve 3. A spring 4 is disposed in the cavity formed by the spring support 5 and the upper part of the sleeve 3.

[0023] The upper part of the lead screw 1 is mounted on the lead screw support 2, and the lower end passes through the through hole 31 of the sleeve 3 and connects to the spring support 5. For example... Figure 4 As shown, the lead screw 1 can rotate. The lead screw 1 is connected to the spring support 5 by a thread. By rotating the lead screw 1, the spring support 5 can move up and down along the lead screw, changing the compression of the spring 4, thereby changing the acceleration required for the sleeve 3 and the plug 6 to move downward.

[0024] This patented hydraulic pressure compensation device is installed on the oil supply pipeline of the sealed oil tank via a housing 8. The inlet and outlet are respectively connected to an inlet pipe and an outlet pipe extending outwards, and are installed perpendicular to the ground. The device is connected to the external sealed oil tank's oil supply pipeline via the inlet and outlet. Figure 1 As shown, when the sealing oil tank is supplied with oil, the sealing oil enters from the inlet at the right end of the oil pressure compensation device and flows out from the outlet at the lower end of the oil pressure compensation device. When the acceleration experienced by the propeller is lower than the downward acceleration of the sleeve 3 and the plug 6, the oil pressure compensation device is in the open state and does not affect the supply of sealing oil; for example... Figure 4 and Figure 5 As shown, when the acceleration experienced by the thruster is not less than the downward acceleration of the sleeve 3 and the plug 6, the sleeve 3 and the plug 6 move to the sealing position of the oil outlet of the housing 8, thereby sealing the oil pipeline.

[0025] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. An adjustable rotary seal hydraulic pressure compensation device for a ship propeller, characterized in that: The device includes a housing (8) and a screw support (2) installed at the top opening of the housing (8). A sleeve (3) is provided inside the housing (8). A plug (6) and a sealing ring (7) are provided on the lower end face of the sleeve (3). A screw (1) is installed on the screw support (2). A spring support (5) connected to the screw (1) is provided inside the sleeve (3). A spring (4) is sleeved on the screw (1) between the spring support (5) and the screw support (2). The spring (4) is located in the cavity formed by the spring support (5) and the upper part of the sleeve (3). The screw (1) and the spring support (5) are connected by threads. By rotating the screw (1), the spring support (5) can move up and down along the screw, changing the compression of the spring (4), thereby changing the acceleration required for the sleeve (3) and the plug (6) to move downward. An oil outlet is provided at the bottom end of the housing (8). An oil inlet is provided on the side wall of the housing (8) between the sealing ring (7) and the oil outlet.

2. The adjustable rotary seal hydraulic pressure compensation device for a ship propeller according to claim 1, characterized in that, The upper end face of the sleeve (3) is provided with a through hole (31) through which the lead screw (1) can pass. The sleeve (3) is provided with a convex ring (32) that is in sealing contact with the inner surface of the housing (8).

3. The adjustable rotary seal hydraulic pressure compensation device for a ship propeller according to claim 1, characterized in that, The plug (6) has a downwardly extending frustum on its lower end face, and the sealing ring (7) is installed on the frustum; the inner surface of the housing (8) has a thrust surface at the corresponding position of the oil outlet, which is sealed and cooperates with the frustum and the sealing ring (7).

4. The adjustable rotary seal hydraulic pressure compensation device for a ship propeller according to claim 1, characterized in that, The sleeve (3) and the spring support (5) are respectively provided with annular mounting bones and mounting grooves for use with the spring (4).

5. An adjustable rotary seal hydraulic pressure compensation device for a ship propeller according to claim 1, characterized in that, The oil inlet and oil outlet of the housing (8) are respectively extended outward by an oil inlet pipe and an oil outlet pipe.

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