Pneumatic control type marine stern shaft sealing device

Abstract

The invention discloses a pneumatic control type marine stern shaft sealing device which comprises a stern shaft body, a stern shaft sleeve body, a sealing ring sleeve, an annular sealing piece and a pneumatic control type assembly. When the sealing effect of the periphery of the inner side of the inner ring sleeve and the periphery of the stern shaft sleeve body is reduced, the ventilation ring can be driven by the power unit to move to the periphery of the outer ring sleeve, then airflow is input into the ventilation pipe, the airflow passes through the ventilation ring, and the ventilation ring inputs the airflow into the annular ventilation cavity through the ventilation holes of the outer ring sleeve; through the abutting force of airflow, the outer side of the periphery of the inner side ring sleeve is evenly controlled by air pressure in an abutting mode, so that the periphery of the inner side of the inner side ring sleeve is tightly attached to the outer side of the periphery of the stern shaft sleeve body in an abutting mode, the sealing effect can be improved, and extrusion deformation caused by rigid connection to the inner side ring sleeve is avoided through the airflow abutting mode; meanwhile, the ventilation ring is driven by the power unit to move, the position of input airflow can be flexibly controlled, and use is more flexible.

Description

Technical Field

[0001] The invention belongs to the field of marine accessories, and in particular relates to a gas-controlled marine stern shaft sealing device. Background Art

[0002] In the shipbuilding industry, especially in the manufacturing process of ships, in order to prevent seawater from infiltrating into the cabin along the stern tube, the stern shaft connected to the stern tube bearing seat must be tightly sealed to ensure the safety performance of the ship. The current device for sealing the stern shaft at this location on the ship is generally sealed by a plurality of sealing rings, and the inner sides of the sealing rings are tightly connected to the outer sides of the stern shaft sleeve body. However, when the stern shaft and the stern shaft sleeve body rotate at high speed for a long time, the stern shaft sleeve body and the sealing ring will constantly rub, so that the contact degree between the sealing ring and the stern shaft sleeve body is reduced, which has the disadvantage of reduced sealing effect. Therefore, it is necessary to regularly disassemble and replace accessories and overhaul, the service life is short, and the use is more cumbersome. Therefore, it is necessary to improve the sealing performance of the entire structure and upgrade the entire structure. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention solves the problem of providing a pneumatically controlled marine stern shaft sealing device with good sealing performance, long service life and convenient use and control.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: A pneumatically controlled marine stern shaft sealing device comprises a stern shaft body, a stern shaft sleeve body, a sealing ring sleeve, an annular seal, and a pneumatically controlled component; the stern shaft body is sleeved and installed on the outer side around the stern shaft body; the sealing ring sleeve is installed on the outer side around the stern shaft sleeve body; two annular sealing cavities are arranged around the inside of the sealing ring sleeve; an annular seal is installed in each of the annular sealing cavities; the annular seal comprises an outer ring sleeve and an inner ring sleeve; an outer ring sleeve is installed in each of the annular sealing cavities; the inner ring sleeves are installed at both ends around the inner side of the outer ring sleeve, an annular ventilation cavity is arranged between the two inner ring sleeves, and the inner ring sleeves are provided with a plurality of annular vents around the inner side of the inner ring sleeves. The air-controlled assembly is installed on the sealing ring sleeve; the air-controlled assembly includes a ventilation ring, a power unit and a ventilation pipe; the ventilation ring is slidably installed on the sealing ring sleeve; the ventilation pipe is installed on the sealing ring sleeve and communicated with the ventilation ring; the power unit is installed on the sealing ring sleeve, and the power unit drives the ventilation ring to move to the outside of an outer ring sleeve, and the ventilation ring inputs airflow into the annular ventilation cavity through the ventilation holes of the outer ring sleeve, and the pressure of the airflow makes the inner side of the inner ring sleeve tightly fit and press against the outside of the stern shaft sleeve.

[0005] Furthermore, wedge-shaped annular surfaces are respectively arranged on the opposite inner sides of the two inner ring sleeves, and the two wedge-shaped annular surfaces form a conical annular groove structure with a larger outer side and a smaller inner side.

[0006] Furthermore, an annular movable groove is provided around the inside of the sealing ring sleeve; the annular movable groove is located on the outside of the annular sealing cavity; the ventilation ring is slidably installed in the annular movable groove; the ventilation pipe is connected to the upper side of the sealing ring sleeve, the inner end of the ventilation pipe extends to the inside of the annular movable groove, and the outer end of the ventilation pipe extends to the outside of the upper side of the sealing ring sleeve; the inner end of the ventilation pipe is connected to one side of the ventilation ring through a telescopic ventilation pipe.

[0007] Furthermore, movable slots are respectively provided on the upper and lower sides of the annular movable groove; the upper and lower sides of the ventilation ring are respectively slidably connected to the movable slots through movable blocks; a driving screw is rotatably installed in the movable slot on the upper side of the annular movable groove, the driving screw is threadedly screwed with the movable block, the power unit is a driving motor, and the power unit is connected to the outer end of the driving screw through a connecting shaft.

[0008] Furthermore, an air suction device is provided at the outer end of the ventilation pipe.

[0009] Furthermore, the inner side of the ventilation ring is connected to the ventilation holes of the outer ring sleeve through openings at the top and bottom.

[0010] Furthermore, both ends of the outer ring sleeve are in sealing contact with both sides of the inner periphery of the annular sealing cavity.

[0011] Furthermore, the outer ring sleeve and the inner ring sleeve are both made of elastic rubber material.

[0012] The beneficial effects of the present invention are as follows: The present invention designs a brand-new sealing structure. When the sealing effect between the inner periphery of the inner ring sleeve and the outer periphery of the stern shaft sleeve body is reduced, the power unit can be used to drive the ventilation ring to move to the outer periphery of the outer ring sleeve, and then the ventilation pipe inputs airflow. The airflow passes through the ventilation ring, and the ventilation ring inputs airflow to the annular ventilation cavity through the ventilation holes of the outer ring sleeve. The outer periphery of the inner ring sleeve is uniformly pressed by the air pressure through the pressure of the airflow, so that the inner periphery of the inner ring sleeve is tightly fitted and pressed against the outer periphery of the stern shaft sleeve body, thereby improving the sealing effect. The airflow pressure can avoid the extrusion deformation of the inner ring sleeve caused by the rigid connection. The structural design is ingenious. At the same time, the present invention can flexibly control the position of the input airflow by driving the ventilation ring to move through the power unit, and the use is more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention.

[0014] Figure 2 For the present invention Figure 1 Schematic diagram of the structure in the upper middle part.

[0015] Figure 3 For the present invention Figure 2 Schematic diagram of the structure after the middle ventilation ring is moved.

[0016] Figure 4 For the present invention Figure 3 A schematic diagram of the partially enlarged structure of the middle ventilation ring, the outer ring sleeve, and the inner ring sleeve.

[0017] Figure 5 It is a schematic diagram of the cross-sectional structure of the sealing component of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] like Figures 1 to 5 As shown, a pneumatically controlled marine stern shaft sealing device comprises a stern shaft body 1, a stern shaft sleeve body 2, a sealing ring sleeve 3, an annular seal 4, and a pneumatically controlled component 5; the stern shaft body 1 is sleeved and installed with the stern shaft sleeve body 2 on the outer side around; the sealing ring sleeve 3 is installed on the outer side around the stern shaft sleeve body 2; two annular sealing cavities 31 are arranged around the inner side of the sealing ring sleeve 3; an annular seal 4 is installed in each of the annular sealing cavities 31; the annular seal 4 comprises 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 around the inner side of the outer ring sleeve 41, an annular ventilation cavity 421 is arranged between the two inner ring sleeves 42, and the inner sides of the inner ring sleeves 42 are pressed against each other. On the outside of the stern shaft sleeve body 2; ventilation holes 411 are respectively provided on the upper and lower parts of the outer ring sleeve 41; the air-controlled component 5 is installed on the sealing ring sleeve 3; the air-controlled component 5 includes a ventilation ring 51, a power unit 52, and a ventilation pipe 53; the ventilation ring 51 is slidably installed on the surroundings of the sealing ring sleeve 3; the ventilation pipe 53 is installed on the sealing ring sleeve 3 and communicated with the ventilation ring 51; the power unit 52 is installed on the sealing ring sleeve 3, and the power unit 52 drives the ventilation ring 51 to move to the outside of the surroundings of an outer ring sleeve 41, and the ventilation ring 51 inputs airflow to the annular ventilation cavity 421 through the ventilation holes 411 of the outer ring sleeve 41, and the pressure of the airflow makes the inner side of the inner ring sleeve 42 tightly fit and press against the outer side of the surroundings of the stern shaft sleeve body 2.

[0020] like Figures 1 to 5As shown, in order to effectively improve the sealing performance of the inner ring sleeve 42 and the stern shaft sleeve body 2 by the impact of the airflow, further, the two inner ring sleeves 42 are respectively provided with wedge-shaped annular surfaces 422 on the opposite inner sides, and the two wedge-shaped annular surfaces 422 form a tapered annular groove structure with a larger outer side and a smaller inner side. In this way, the airflow can press the wedge-shaped annular surfaces 422 to improve the degree of pressure between the inner ring sleeve 42 and the stern shaft sleeve body 2, thereby improving the sealing performance.

[0021] like Figures 1 to 5 As shown, in order to facilitate the movement of the ventilation ring 51 and to facilitate pressurization of different locations to improve the sealing performance, further, an annular movable groove 32 is provided around the interior of the sealing ring sleeve 3; the annular movable groove 32 is located on the outside of the annular sealing cavity 31; the ventilation ring 51 is slidably installed in the annular movable groove 32; the ventilation pipe 53 is connected to the upper side of the sealing ring sleeve 3, the inner end of the ventilation pipe 53 extends to the inside of the annular movable groove 32, and the outer end of the ventilation pipe 53 extends to the outside of the upper side of the sealing ring sleeve 3; the inner end of the ventilation pipe 53 is connected to one side of the ventilation ring 51 through a telescopic ventilation pipe 531.

[0022] like Figures 1 to 5 As shown, in order to facilitate the stable movement of the ventilation ring 51, further, the upper and lower sides of the annular movable groove 32 are respectively provided with movable card grooves 321; the upper and lower sides of the ventilation ring 51 are respectively slidably connected to the movable card groove 321 through the movable card block 511; a driving screw rod 322 is rotatably installed in the movable card groove 321 on the upper side of the annular movable groove 32, and the driving screw rod 322 is threadedly screwed with the movable card block 511, and the power unit 52 is a driving motor, and the power unit 52 is connected to the outer end of the driving screw rod 322 through the connecting shaft 521.

[0023] like Figures 1 to 5 As shown, in order to facilitate air inhalation, further, the outer end of the vent pipe 53 is provided with an air suction device 6. Further, the inner side of the vent ring 51 is connected to the vent holes 411 of the outer ring sleeve 41 through openings. Further, the two ends of the outer ring sleeve 41 are sealed and abutted against the inner sides of the annular sealing cavity 31. Further, the outer ring sleeve 41 and the inner ring sleeve 42 are both made of elastic rubber material.

[0024] The present invention has designed a brand-new sealing structure. When the sealing effect of the inner side of the inner ring sleeve 42 and the outer side of the stern shaft sleeve body 2 is reduced, the power unit 52 can be used to drive the ventilation ring 51 to move to the outer side of the outer ring sleeve 41, and then the ventilation pipe 53 inputs airflow. The airflow passes through the ventilation ring 51, and the ventilation ring 51 inputs airflow to the annular ventilation cavity 421 through the ventilation holes 411 of the outer ring sleeve 41. The outer side of the inner ring sleeve 42 is uniformly pressed by the air pressure through the pressure of the airflow, so that the inner side of the inner ring sleeve 42 is tightly fitted and pressed against the outer side of the stern shaft sleeve body 2. This can improve the sealing effect, and the rigid connection is avoided from causing extrusion and deformation of the inner ring sleeve 42 through the airflow pressure. The structural design is ingenious. At the same time, the present invention can flexibly control the position of the input airflow by driving the ventilation ring 51 to move through the power unit 52, and it is more flexible to use.

[0025] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pneumatically controlled marine stern shaft sealing device, characterized in that: It comprises a stern shaft body, a stern shaft sleeve body, a sealing ring sleeve, an annular seal, and a gas-controlled component; the stern shaft sleeve body is sleeved and installed on the outer side of the stern shaft body; the sealing ring sleeve is installed on the outer side of the stern shaft sleeve body; two annular sealing cavities are arranged around the inner side of the sealing ring sleeve; an annular seal is installed in each annular sealing cavity; the annular seal comprises an outer ring sleeve and an inner ring sleeve; an outer ring sleeve is installed in each annular sealing cavity; the inner ring sleeves are installed at both ends around the inner side of the outer ring sleeve, an annular ventilation cavity is arranged between the two inner ring sleeves, and the inner side of the inner ring sleeve is pressed against the stern shaft The outer side of the sleeve body; ventilation holes are respectively provided at the upper and lower parts of the outer ring sleeve; the air-controlled component is installed on the sealing ring sleeve; the air-controlled component includes a ventilation ring, a power unit, and a ventilation pipe; the ventilation ring is slidably installed on the surroundings of the sealing ring sleeve; the ventilation pipe is installed on the sealing ring sleeve and connected with the ventilation ring; the power unit is installed on the sealing ring sleeve, and the power unit drives the ventilation ring to move to the outer side of the surroundings of an outer ring sleeve, and the ventilation ring inputs airflow into the annular ventilation cavity through the ventilation holes of the outer ring sleeve, and the pressure of the airflow makes the inner side of the inner ring sleeve tightly fit and press against the outer side of the surroundings of the stern shaft sleeve body.

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

3. The pneumatically controlled marine stern shaft sealing device according to claim 1, characterized in that: An annular movable groove is provided around the inside of the sealing ring sleeve; the annular movable groove is located on the outside of the annular sealing cavity; the ventilation ring is slidably installed in the annular movable groove; the ventilation pipe is connected to the upper side of the sealing ring sleeve, the inner end of the ventilation pipe extends to the inside of the annular movable groove, and the outer end of the ventilation pipe extends to the outside of the upper side of the sealing ring sleeve; the inner end of the ventilation pipe is connected to one side of the ventilation ring through a telescopic ventilation pipe.

4. The pneumatically controlled marine stern shaft sealing device according to claim 3, characterized in that: The upper and lower sides of the annular movable groove are respectively provided with movable slots; the upper and lower sides of the ventilation ring are respectively slidably connected to the movable slots through movable blocks; a driving screw is rotatably installed in the movable slot on the upper side of the annular movable groove, the driving screw is threadedly screwed with the movable block, the power unit is a driving motor, and the power unit is connected to the outer end of the driving screw through a connecting shaft.

5. The pneumatically controlled marine stern shaft sealing device according to claim 3, characterized in that: The outer end of the vent pipe is provided with an air suction device.

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

7. The pneumatically controlled marine stern shaft sealing device according to claim 1, characterized in that: The two ends of the outer ring sleeve are in sealing contact with the inner two sides of the annular sealing cavity.

8. The pneumatically controlled marine stern shaft sealing device according to claim 1, characterized in that: The outer ring sleeve and the inner ring sleeve are both made of elastic rubber material.

Images