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CN-121977072-A - Ship stern shaft sealing device

CN121977072ACN 121977072 ACN121977072 ACN 121977072ACN-121977072-A

Abstract

The invention discloses a ship stern shaft sealing device, which belongs to the technical field of stern shaft sealing and comprises an oil seal cylinder body and a main body mechanism for crushing sundries such as water plants wound on a power stern shaft when a ship walks, wherein the oil seal cylinder body is internally provided with an oil seal mechanism for lubricating and sealing the power stern shaft and two sealing mechanisms for sealing the power stern shaft. According to the invention, the slidable pressure maintaining slide block and the slide block spring, and the pressure compensation mechanism formed by the inner contact ring and the connecting ring spring are arranged in the oil seal cylinder, when the external oil pump injects oil into the oil seal cylinder, the oil pushes the pressure maintaining slide block and the inner contact ring to compress the spring, the elastic force of the compression spring is utilized to provide continuous and stable back pressure for the oil, so that the oil pressure in the oil seal cylinder is always higher than the sea water pressure when a ship sails, a forward pressure barrier is formed, the inward leakage of sea water is prevented, and the reliability of the sealing device is improved.

Inventors

  • XU ZHENGAO
  • CAO HAIJIAN
  • YE HUA
  • LI SHUMIN
  • DENG WEIXIANG
  • DING XUHONG

Assignees

  • 东台船用配件有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (8)

  1. 1. The ship stern shaft sealing device comprises an oil seal cylinder body (101), a power stern shaft (104) arranged on the oil seal cylinder body (101) and a main body mechanism for crushing sundries wound on the power stern shaft (104), and is characterized in that an oil seal mechanism for lubricating and sealing the power stern shaft (104) and two sealing mechanisms for sealing the power stern shaft (104) are arranged in the oil seal cylinder body (101); the main body mechanism comprises a front end cover plate (102) and a rear end cover plate (103) which are fixedly arranged at two ends of the oil seal cylinder body (101); The main body mechanism further comprises an outer protecting shell (107) fixedly mounted on the rear end cover plate (103), the outer protecting shell (107) is located outside the ship body, an inner cleaning sleeve (108) is fixedly mounted on the power stern shaft (104), a plurality of inner crushing teeth (109) are arranged on the inner cleaning sleeve (108), a plurality of outer crushing teeth (110) are fixedly mounted on the inner side of the outer protecting shell (107), and a plurality of slag outlet holes (111) are formed in the outer protecting shell (107).
  2. 2. A ship stern shaft sealing device according to claim 1, wherein two oil inlet openings (106) are formed in the side face of the oil seal cylinder (101), the power stern shaft (104) penetrates through the front end cover plate (102), the oil seal cylinder (101) and the rear end cover plate (103), and the rear end cover plate (103) is fixedly mounted with the ship.
  3. 3. The ship stern shaft sealing device according to claim 1, wherein the oil seal mechanism comprises a middle groove ring (202) fixedly installed in the middle of the inner wall of the oil seal cylinder body (101), an arc-shaped groove is formed in the inner side of the middle groove ring (202), a plurality of annular balls (205) are rotatably installed in the arc-shaped groove of the middle groove ring (202), the power stern shaft (104) is located in the inner side of all the annular balls (205), the power stern shaft (104) is in contact with the annular balls (205), two oil inlet hoppers (201) are arranged on the oil seal cylinder body (101), the two oil inlet hoppers (201) are located on two sides of the middle groove ring (202) respectively, and the two oil inlet hoppers (201) are communicated with the two oil inlet ports (106) respectively.
  4. 4. A ship stern shaft sealing device according to claim 3, wherein the oil seal mechanism further comprises a plurality of sealing sleeves (211) arranged on the inner wall of the oil seal cylinder body (101), pressure maintaining sliding blocks (203) are slidably mounted in the sealing sleeves (211), the sealing sleeves (211) are fixedly mounted with the middle groove ring (202), sliding block springs (204) are arranged between the pressure maintaining sliding blocks (203) and the middle groove ring (202), and the sliding block springs (204) are located in the sealing sleeves (211).
  5. 5. The ship stern shaft sealing device according to claim 4, wherein the oil seal mechanism further comprises two inner fixing sleeves (206) fixedly installed at two ends in the oil seal cylinder (101), the inner fixing sleeves (206) are respectively provided with inner contact rings (208) in a sliding mode, inner transverse guide columns (207) are fixedly installed on the inner contact rings (208), the inner transverse guide columns (207) are slidably installed with the inner fixing sleeves (206), ring connecting springs (209) are arranged between the inner contact rings (208) and the inner fixing sleeves (206), a closed space is formed between the inner fixing sleeves (206) and the inner contact rings (208), the ring connecting springs (209) are located in the closed space, and inner sensors (210) are fixedly installed at ends, far away from the inner contact rings (208), of the inner transverse guide columns (207).
  6. 6. A ship stern shaft sealing device according to claim 2, wherein the sealing mechanism comprises inner fixing sleeves (301) respectively arranged at two ends of the oil seal cylinder body (101), one inner fixing sleeve (301) is fixedly arranged with the front end cover plate (102), the other inner fixing sleeve (301) is fixedly arranged with the rear end cover plate (103), and two annular grooves are formed in the inner side of the inner fixing sleeve (301).
  7. 7. The ship stern shaft sealing device according to claim 6, wherein the sealing mechanism further comprises a rotation following shell (306) rotatably mounted in the inner fixing sleeve (301), a ball sliding groove (303) is formed in the rotation following shell (306), a plurality of middle balls (304) are rotatably mounted on the ball sliding groove (303), an arc sliding groove is formed in the rotation following shell (306), a plurality of inner balls (305) are rotatably mounted in the arc sliding groove, the middle balls (304) and the inner balls (305) are respectively located in two annular grooves on the inner side of the inner fixing sleeve (301), an oil inlet gap (302) for oil supply liquid to enter is formed between the inner fixing sleeve (301) and the inner side of the rotation following shell (306), the outer side of the rotation following shell (306) located beside the front end cover plate (102) is attached to the inner side of the front end cover plate (102), and the outer side of the rotation following shell (306) located beside the rear end cover plate (103) is attached to the rear end cover plate (103).
  8. 8. A ship stern shaft sealing device according to claim 7, wherein the sealing mechanism further comprises a bonded steel coil (308) wound on the power stern shaft (104), side curls (307) bonded with the power stern shaft (104) are arranged on two sides of the bonded steel coil (308), and the bonded steel coil (308) and the side curls (307) are located in the rotating shell (306).

Description

Ship stern shaft sealing device Technical Field The invention relates to the technical field of stern shaft sealing, in particular to a ship stern shaft sealing device. Background The stern shaft system of the ship is a core component of the propulsion device, and the sealing performance of the stern shaft system is directly related to the navigation safety and the operation efficiency of the ship. The stern shaft sealing device is mainly used for preventing seawater from entering the hull along the stern shaft and lubricating the stern shaft to reduce friction and abrasion. However, the existing stern shaft sealing device still has the following disadvantages in practical application. Firstly, in the sailing process of a ship, one end of a stern shaft positioned outside a ship body is easy to wind sundries such as water plants, fishing nets and the like. The winding of the sundries not only can increase the rotation resistance of the stern shaft, so that the propulsion efficiency is reduced, but also the sealing structure can be damaged, and the problem of seawater leakage is caused. The traditional scheme generally needs the manual cleaning of ship shutdown or docking, and is complex in operation and high in cost, and the problem of sundry winding cannot be automatically solved in navigation. Secondly, lubrication and pressure balance mechanisms of the stern shaft sealing device are not perfect. When the stern shaft rotates at high speed, continuous oil lubrication is needed to reduce friction, and meanwhile, the oil pressure in the sealing cavity is higher than the external seawater pressure so as to effectively prevent seawater infiltration. However, existing devices are difficult to discover and compensate in time when oil leaks or is insufficient, resulting in an increased risk of seal failure. In addition, the friction force of the sealing structure is large, the parts are easy to wear after long-term operation, and the service life of the device is influenced. Furthermore, the dynamic sealing performance between the stern shaft and the seal is to be improved. Because the stern shaft has radial runout and axial float in the running process, the traditional sealing element is difficult to keep close fit all the time, and gaps are easy to generate, so that the sealing effect is reduced. Meanwhile, the lubrication mode of the sealing structure is single, a stable oil film cannot be formed between the rotating parts, and the reliability and durability of sealing are further limited. In view of the above, the existing stern shaft sealing device has drawbacks in terms of sundry cleaning, pressure maintenance, dynamic sealing, and the like, and there is a need for improving the operation safety and maintenance convenience of ships. Disclosure of Invention Aiming at the technical problems, the invention discloses a stern shaft sealing device which can automatically crush and wind sundries, keep oil pressure stable and realize efficient dynamic sealing, and the technical scheme adopted by the invention is as follows: the utility model provides a boats and ships stern axle sealing device, includes oil blanket barrel and is used for carrying out broken main part mechanism to the debris such as aquatic weed of winding on power stern axle when boats and ships walk, be provided with in the oil blanket barrel and be used for carrying out lubricated and sealed oil blanket mechanism and two sealing mechanism that are used for carrying out sealedly to power stern axle. Further, the main body mechanism comprises a front end cover plate and a rear end cover plate which are fixedly arranged at two ends of the oil seal cylinder, two oil inlet ports are formed in the side face of the oil seal cylinder, the power stern shaft penetrates through the front end cover plate, the oil seal cylinder and the rear end cover plate, a plurality of power blades are arranged on the power stern shaft, and the rear end cover plate is fixedly arranged with the ship. Further, the main body mechanism further comprises an outer protecting shell fixedly installed on the rear end cover plate, the outer protecting shell is located outside the ship body, an inner cleaning sleeve is fixedly installed on the power stern shaft, a plurality of inner crushing teeth are arranged on the inner cleaning sleeve, a plurality of outer crushing teeth are fixedly installed on the inner side of the outer protecting shell, the outer crushing teeth and the inner crushing teeth are arranged in a staggered mode, and a plurality of slag outlets are formed in the outer protecting shell. When the ship advances, the power blade is driven by the power stern shaft to rotate to provide advancing power, sundries such as water grass are easy to wind on the part, outside the ship body, of the power stern shaft and the inner cleaning sleeve, at the moment, the water grass is located between the power stern shaft and the outer protecting shell, the inner cleaning sleeve is sync