Pneumatic control type marine stern shaft sealing device

Abstract

The application discloses a pneumatic control type stern shaft sealing device for a ship, which comprises a stern shaft body, a stern shaft sleeve body, a sealing ring sleeve, an annular sealing element and a pneumatic control type assembly. When the sealing effect between the inner side of the inner side ring sleeve and the outer side of the four sides of the stern shaft sleeve body is reduced, the air ring can be driven by the power unit to move to the outer side of the four sides of the outer ring sleeve, then the air flow is input through the air pipe, the air flow passes through the air ring, the air ring inputs the air flow to the annular air cavity through the air hole of the outer ring sleeve, the outer side of the four sides of the inner side ring sleeve is uniformly pressed by the air pressure through the resistance of the air flow, the inner side of the inner side ring sleeve is tightly attached to the outer side of the four sides of the stern shaft sleeve body, the sealing effect is improved, the air flow pressing mode is used to avoid the extrusion deformation of the inner side ring sleeve caused by the hard connection, the structure is ingenious, the position of the input air flow can be flexibly controlled by driving the air ring to move through the power unit, and the use is more flexible.

Description

Technical Field

[0001] This invention belongs to the field of marine accessories, and particularly relates to a pneumatically controlled marine stern shaft sealing device. Background Technology

[0002] In the shipbuilding industry, especially during ship construction, to prevent seawater from seeping into the hull along the stern tube, it is essential to tightly seal the stern shaft where it connects to the stern tube bearing housing to ensure the ship's safety performance. Currently, the sealing devices used on ships typically employ multiple sealing rings for pressure sealing. The inner perimeter of the sealing rings is tightly connected to the outer perimeter of the stern shaft sleeve. However, when the stern shaft and stern shaft sleeve rotate at high speeds for extended periods, the stern shaft sleeve and sealing rings experience continuous friction, reducing the contact between the sealing rings and the stern shaft sleeve. This results in reduced sealing effectiveness, necessitating periodic disassembly, replacement of parts, and maintenance, leading to a short service life and cumbersome operation. Therefore, it is necessary to improve the sealing performance of the entire structure and upgrade the entire design. Summary of the Invention

[0003] To address the shortcomings of the prior art, the present invention provides a pneumatically controlled marine stern shaft sealing device that offers excellent sealing performance, long service life, and convenient operation and control.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] A pneumatically controlled marine stern shaft sealing device includes a stern shaft body, a stern shaft sleeve, a sealing ring, an annular seal, and a pneumatically controlled assembly. The stern shaft sleeve is fitted around the outer periphery of the stern shaft body. A sealing ring is installed around the outer periphery of the stern shaft sleeve. Two annular sealing cavities are provided inside the sealing ring. An annular seal is installed in each annular sealing cavity. Each annular seal includes an outer ring and an inner ring. An outer ring is installed in each annular sealing cavity. Inner rings are installed at both ends of the inner periphery of the outer ring, and an annular venting cavity is provided between the two inner rings. The outer ring is pressed against the outer periphery of the stern shaft sleeve. Ventilation holes are provided at the top and bottom of the outer ring. The pneumatically controlled assembly is mounted on the sealing ring. The pneumatically controlled assembly includes a venting ring, a power unit, and a vent pipe. The venting ring is slidably mounted around the sealing ring. The vent pipe is mounted on the sealing ring and communicates with the venting ring. The power unit is mounted on the sealing ring and drives the venting ring to move to the outer periphery of one of the outer rings. The venting ring inputs airflow into the annular venting chamber through the vent holes of the outer ring. The pressure of the airflow causes the inner periphery of the inner ring to tightly press against the outer periphery of the stern shaft sleeve.

[0006] Furthermore, the two inner rings are respectively provided with wedge-shaped annular surfaces on their opposite inner sides, and the two wedge-shaped annular surfaces form a conical annular groove structure with a larger outer side and a smaller inner side.

[0007] Furthermore, the sealing ring sleeve has an annular moving groove around its inner perimeter; the annular moving groove is located outside the annular sealing cavity; the venting ring is slidably installed in the annular moving groove; the venting pipe passes through the upper side of the sealing ring sleeve, with its inner end extending into the interior of the annular moving groove and its outer end extending to the upper exterior of the sealing ring sleeve; the inner end of the venting pipe is connected to one side of the venting ring via a telescopic venting pipe.

[0008] Furthermore, the upper and lower sides of the annular moving groove are respectively provided with moving slots; the upper and lower sides of the venting ring are respectively slidably engaged with the moving slots by moving blocks; a drive screw is rotatably installed in the moving slot on the upper side of the annular moving groove, the drive screw is threadedly connected to the moving block, the power unit is a drive motor, and the power unit is connected to the outer end of the drive screw through a connecting shaft.

[0009] Furthermore, an air intake device is provided at the outer end of the vent pipe.

[0010] Furthermore, the inner side of the vent ring is connected to the vent holes of the outer ring through openings at the top and bottom.

[0011] Furthermore, the two ends of the outer ring sleeve are sealed and abutted against the inner sides of the annular sealing cavity.

[0012] Furthermore, both the outer ring and the inner ring are made of elastic rubber material.

[0013] The beneficial effects of this invention are as follows:

[0014] This invention features a novel sealing structure. When the sealing effect between the inner periphery of the inner ring and the outer periphery of the stern shaft sleeve decreases, the venting ring can be moved to the outer periphery of the outer ring via a power unit. Airflow is then introduced through the vent pipe, passing through the venting ring. The venting ring then introduces airflow into the annular venting chamber through the vent holes of the outer ring. The pressure exerted by the airflow ensures that the outer periphery of the inner ring is uniformly pressurized, resulting in a tight seal between the inner periphery of the inner ring and the outer periphery of the stern shaft sleeve. This improves the sealing effect and avoids the deformation caused by rigid connections through airflow pressure. The ingenious design, coupled with the power unit's ability to move the venting ring, allows for flexible control of the airflow position, making it more versatile in use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2For the present invention Figure 1 A schematic diagram of the upper middle side.

[0017] Figure 3 For the present invention Figure 2 A schematic diagram of the structure after the central vent ring has been moved.

[0018] Figure 4 For the present invention Figure 3 A partially enlarged structural diagram of the central vent ring, outer ring, and inner ring.

[0019] Figure 5 This is a schematic diagram of the cross-sectional structure of the sealing component of the present invention. Detailed Implementation

[0020] The invention will now be described in further detail with reference to the accompanying drawings.

[0021] like Figures 1 to 5 As shown, a pneumatically controlled marine stern shaft sealing device includes a stern shaft body 1, a stern shaft sleeve 2, a sealing ring sleeve 3, an annular seal 4, and a pneumatically controlled assembly 5. The stern shaft sleeve 2 is fitted around the outer periphery of the stern shaft body 1. The sealing ring sleeve 3 is installed around the outer periphery of the stern shaft sleeve 2. The sealing ring sleeve 3 has two annular sealing cavities 31 around its inner periphery. An annular seal 4 is installed in each of the annular sealing cavities 31. The annular seal 4 includes an outer ring sleeve 41 and an inner ring sleeve 42. An outer ring sleeve 41 is installed in each of the annular sealing cavities 31. Inner ring sleeves 42 are installed at both ends of the inner periphery of the outer ring sleeve 41. An annular venting cavity 421 is provided between the two inner ring sleeves 42. The inner periphery of the inner ring sleeve 42 fits and presses against the outer periphery. The outer ring 41 has ventilation holes 411 on its upper and lower sides. The pneumatically controlled assembly 5 is installed on the sealing ring 3. The pneumatically controlled assembly 5 includes a ventilation ring 51, a power unit 52, and a ventilation pipe 53. The ventilation ring 51 is slidably installed around the sealing ring 3. The ventilation pipe 53 is installed on the sealing ring 3 and communicates with the ventilation ring 51. The power unit 52 is installed on the sealing ring 3. The power unit 52 drives the ventilation ring 51 to move to the outer side of one of the outer rings 41. The ventilation ring 51 inputs airflow into the annular ventilation cavity 421 through the ventilation holes 411 of the outer ring 41. The airflow pressure causes the inner side of the inner ring 42 to fit tightly against the outer side of the stern shaft sleeve 2.

[0022] like Figures 1 to 5As shown, in order to effectively improve the pressure and sealing performance between the inner ring sleeve 42 and the stern shaft sleeve 2 through the impact of the airflow, wedge-shaped annular surfaces 422 are further provided on the opposite inner sides of the two inner ring sleeves 42. The two wedge-shaped annular surfaces 422 form a conical annular groove structure with a larger outer side and a smaller inner side. In this way, the pressure of the airflow against the wedge-shaped annular surfaces 422 can be increased, thereby improving the pressure between the inner ring sleeve 42 and the stern shaft sleeve 2 and enhancing the sealing performance.

[0023] like Figures 1 to 5 As shown, to facilitate the movement of the vent ring 51 and to facilitate pressurization at different locations to improve sealing, the sealing ring sleeve 3 is further provided with an annular moving groove 32 around its inner perimeter; the annular moving groove 32 is located outside the annular sealing cavity 31; the vent ring 51 is slidably installed in the annular moving groove 32; the vent pipe 53 passes through the upper side of the sealing ring sleeve 3, with its inner end extending into the interior of the annular moving groove 32 and its outer end extending to the upper exterior of the sealing ring sleeve 3; the inner end of the vent pipe 53 is connected to one side of the vent ring 51 via a telescopic vent pipe 531.

[0024] like Figures 1 to 5 As shown, in order to facilitate the stable movement of the ventilation ring 51, the upper and lower sides of the annular moving groove 32 are respectively provided with moving slots 321; the upper and lower sides of the ventilation ring 51 are respectively slidably engaged with the moving slots 321 by moving blocks 511; a drive screw 322 is rotatably installed in the moving slot 321 on the upper side of the annular moving groove 32, the drive screw 322 is threadedly connected to the moving block 511, and the power unit 52 is a drive motor, which is connected to the outer end of the drive screw 322 through a connecting shaft 521.

[0025] like Figures 1 to 5 As shown, to facilitate airflow intake, the outer end of the vent pipe 53 is further provided with an air intake device 6. Furthermore, the inner sides of the vent ring 51 are connected to the vent holes 411 of the outer ring sleeve 41 through openings at the top and bottom. Furthermore, the two ends of the outer ring sleeve 41 are sealed and abutted against the inner sides of the annular sealing cavity 31. Furthermore, both the outer ring sleeve 41 and the inner ring sleeve 42 are made of elastic rubber material.

[0026] This invention features a novel sealing structure. When the sealing effect between the inner periphery of the inner ring 42 and the outer periphery of the stern shaft sleeve 2 decreases, the vent ring 51 can be moved to the outer periphery of the outer ring 41 by the power unit 52. Then, airflow is introduced through the vent pipe 53. The airflow passes through the vent ring 51, and the vent ring 51 introduces airflow into the annular vent chamber 421 through the vent hole 411 of the outer ring 41. The pressure of the airflow ensures that the outer periphery of the inner ring 42 is uniformly pressurized, thus ensuring that the inner periphery of the inner ring 42 is tightly pressed against the outer periphery of the stern shaft sleeve 2. This improves the sealing effect and avoids the deformation of the inner ring 42 caused by rigid connection through airflow pressure. The structure is ingeniously designed. Furthermore, the power unit 52 drives the vent ring 51 to move, allowing for flexible control of the input airflow position and making it more flexible to use.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pneumatically controlled marine stern shaft sealing device, characterized in that, The system includes a stern shaft body, a stern shaft sleeve, a sealing ring, an annular seal, and a pneumatically controlled assembly. The stern shaft sleeve is fitted around the outer perimeter of the stern shaft body. A sealing ring is installed around the outer perimeter of the stern shaft sleeve. The sealing ring has two annular sealing cavities around its inner perimeter. An annular seal is installed in each of the annular sealing cavities. Each annular seal includes an outer ring and an inner ring. An outer ring is installed in each of the annular sealing cavities. Two ends of the inner perimeter of the outer ring are respectively fitted with… An inner ring sleeve has an annular vent chamber between the two inner ring sleeves, and the inner periphery of the inner ring sleeve is pressed against the outer periphery of the stern shaft sleeve. Ventilation holes are provided at the top and bottom of the outer ring sleeve. A pneumatically controlled assembly is mounted on the sealing ring sleeve. The pneumatically controlled assembly includes a vent ring, a power unit, and a vent pipe. The vent ring is slidably mounted around the sealing ring sleeve. The vent pipe is mounted on the sealing ring sleeve and communicates with the vent ring. The power unit is mounted on the sealing ring sleeve and drives the vent ring to move. The venting ring moves to the outer perimeter of an outer ring sleeve. Airflow is introduced into the annular venting cavity through the vent holes of the outer ring sleeve. The pressure of the airflow causes the inner perimeter of the inner ring sleeve to tightly press against the outer perimeter of the stern shaft sleeve. The inner perimeter of the sealing ring sleeve has an annular moving groove. The annular moving groove is located outside the annular sealing cavity. The venting ring is slidably installed within the annular moving groove. The venting pipe passes through the upper side of the sealing ring sleeve, with its inner end extending into the annular moving groove and its outer end extending to the upper outer side of the sealing ring sleeve. The inner end of the venting pipe is connected to one side of the venting ring via a telescopic venting pipe. The upper and lower sides of the annular moving groove each have a moving slot. The upper and lower sides of the venting ring are slidably engaged with the moving slots via moving blocks. A drive screw is rotatably installed in the moving slot on the upper side of the annular moving groove. The drive screw is threadedly connected to the moving block. The power unit is a drive motor, which is connected to the outer end of the drive screw via a connecting shaft.

2. The pneumatically controlled marine stern shaft sealing device according to claim 1, characterized in that, The two inner rings are respectively provided with wedge-shaped ring surfaces on their opposite inner sides, and the two wedge-shaped ring surfaces form a conical ring groove structure with the outer side larger than the inner side.

3. The pneumatically controlled marine stern shaft sealing device according to claim 1, characterized in that, The outer end of the vent pipe is equipped with an air intake device.

4. The pneumatically controlled marine stern shaft sealing device according to claim 1, characterized in that, The inner side of the vent ring is connected to the vent holes of the outer ring through openings at the top and bottom.

5. The pneumatically controlled marine stern shaft sealing device according to claim 1, characterized in that, The two ends of the outer ring are sealed and abutted against the inner sides of the annular sealing cavity.

6. The pneumatically controlled marine stern shaft sealing device according to claim 1, characterized in that, Both the outer and inner rings are made of elastic rubber material.

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