Pressure adjustable stern shaft sealing device for a ship

Abstract

The application relates to the technical field of stern shaft sealing, in particular to a pressure-adjustable ship stern shaft sealing device, which comprises a sealing mounting piece, an extension part is installed on the sealing mounting piece, and the sealing mounting piece and the extension part are sealed; a shaft sleeve sealing piece is installed on the extension part, the extension part is used for adjusting the position of the extension part; a stern shaft connecting piece is sleeved on the inner side of the shaft sleeve sealing piece; a calibration prompting piece is installed on the sealing mounting piece; the extension part can be telescopically adjusted to drive the adjustment of the pasting position of a contraction rubber ring and a stern shaft sleeve, the service life of the stern shaft sleeve is prolonged, and long-term local wear is avoided; the inner side of the contraction rubber ring can be pasted with the ground glass surface to perform cleaning and friction work, and impurities are prevented from existing at the pasting position between the inner side of the contraction rubber ring and the stern shaft sleeve.

Description

Technical Field

[0001] This invention relates to the field of stern shaft sealing technology, specifically to a pressure-adjustable stern shaft sealing device for ships. Background Technology

[0002] The stern shaft is the last shaft section in the shafting system. Its bow end is connected to the intermediate shaft via a flange, and its stern end is conical for mounting the propeller. It is forged from high-quality carbon steel. Its core function is to transmit the main engine power to the propeller, and its sealing quality is particularly important. It usually requires internal and external sealing components, which are installed at both ends of the stern shaft tube. The internal sealing component of the stern shaft, located inside the hull, undertakes functions such as pressure regulation and needs to be adjusted frequently according to factors such as draft. The stern shaft seal usually uses a sealing ring with a beveled structure to fit the stern shaft sleeve seal.

[0003] Current ship stern shaft sealing devices typically employ a fixed internal sealing structure. With prolonged ship operation, the inner side of the sealing ring and the stern shaft sleeve experience constant friction, resulting in the accumulation of black impurities due to the mixing of sealing oil. This affects sealing quality and makes cleaning difficult. Simultaneously, the constant friction between the sealing ring and the contact surface of the stern shaft sleeve causes wear, including surface shrinkage. While the sealing ring is easy to replace, replacing the stern shaft sleeve is more difficult, requiring cumbersome disassembly of the ship's stern shaft. It is inconvenient to use a pressure-regulating oil pump to switch the wear location, leading to a short service life for the stern shaft sleeve. Furthermore, traditional sealing structures make it difficult to inspect stern shaft accuracy from within the sealing structure, and external measurements often have significant accuracy deviations. Summary of the Invention

[0004] The purpose of this invention is to provide a pressure-adjustable ship stern shaft sealing device to solve the problems mentioned in the background art, such as the inconvenience of using a pressure regulating oil pump to switch the wear position and the short service life of the stern shaft sleeve.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressure-adjustable ship stern shaft sealing device, comprising a sealing mounting component, wherein a telescopic part is mounted on the sealing mounting component, and a seal is formed between the sealing mounting component and the telescopic part; a bushing seal is mounted on the telescopic part, and the telescopic part is used to adjust the position of the bushing seal; a stern shaft connector is sleeved inside the bushing seal; a calibration indicator is mounted on the sealing mounting component; the sealing mounting component includes: a sealing sleeve and a sealing outer sleeve, wherein the sealing sleeve has a flange at its end and four sliding grooves are formed on the sealing sleeve; the sealing outer sleeve is fixedly mounted on the sealing sleeve, and a rubber ring is provided inside the sealing outer sleeve; and a screw hole is provided on the sealing outer sleeve.

[0006] Preferably, the sealing installation component further includes: a positioning bolt, a tension spring, and a bellows, wherein the end of the tension spring is fixedly installed at the end of the sealing sleeve; the tension spring is located inside the telescopic part; the end of the bellows is fixedly installed at the end of the sealing sleeve; the flange on the sealing sleeve is used to be installed at the end of the stern tube by bolts; the screw hole on the outer sleeve of the sealing sleeve is internally threaded with a positioning bolt, and the end of the positioning bolt has a tapered structure; a rubber insulating layer is provided on the inner side of the sealing sleeve.

[0007] Preferably, the telescopic part includes: a telescopic cylinder and positioning holes; the inner side of the telescopic cylinder is provided with four protruding strips; the telescopic cylinder is slidably sleeved on the sealing sleeve; the four protruding strips on the inner side of the telescopic cylinder are slidably installed in four sliding grooves opened on the sealing sleeve; the other end of the tension spring is fixedly connected to the inner side of the telescopic cylinder; the other end of the bellows is connected to the inner side of the telescopic cylinder; a row of positioning holes is opened on the telescopic cylinder; the end of the positioning bolt is inserted into the positioning hole; the bellows is used to seal the telescopic cylinder and the sealing sleeve.

[0008] Preferably, the bushing seal includes: an inner pressure ring, a pressure regulating pipe, and an outer pressure ring. The inner pressure ring is attached to the telescopic cylinder. The outer pressure ring is attached to the inner pressure ring. A bolt is inserted into the outer pressure ring, and the bolt passes through the inner pressure ring and is threaded onto the telescopic cylinder. A pressure regulating pipe is fixedly installed on the inner pressure ring, and a valve is provided on the pressure regulating pipe. The pressure regulating pipe is externally connected to a marine pressure regulating oil pump.

[0009] Preferably, the bushing seal further includes: a sealing ring and a shrinking rubber ring, wherein there are two sealing rings, each with a beveled structure; the two sealing rings are respectively fitted inside the inner pressure ring and the outer pressure ring; one of the sealing rings is clamped and fitted between the inner pressure ring and the telescopic cylinder; the other sealing ring is clamped and fitted between the inner pressure ring and the outer pressure ring; shrinking rubber rings are respectively fitted outside the two sealing rings; the shrinking rubber rings are used to shrink the sealing rings.

[0010] Preferably, the stern shaft connector includes: a stern shaft sleeve and a frosted surface, wherein the stern shaft sleeve is provided with a flange; the stern shaft sleeve is fitted inside two sealing rings; the stern shaft sleeve is provided with a row of frosted surfaces, and there is a gap between the row of frosted surfaces; the two sealing rings are respectively located at the gaps in the row of frosted surfaces; the frosted surfaces are used to rub the sealing rings.

[0011] Preferably, the stern shaft connector further includes: a mixing blade and a contact ring, wherein a ring of mixing blades is fixedly installed on the stern shaft sleeve, and the ring of mixing blades is located inside the sealing sleeve; a contact ring is sleeved on the outer side of the ring of mixing blades; the contact ring and the stern shaft sleeve are concentric.

[0012] Preferably, the verification prompt includes: two verification conductive posts, which are respectively fixedly pasted inside the sealing sleeve, and the two verification conductive posts are insulated from the sealing sleeve; a gap is provided between the two verification conductive posts.

[0013] Preferably, the verification prompt further includes: connecting wires, two connecting wires are fixedly inserted into the sealing sleeve, and the outer side of the two connecting wires is provided with an insulating layer; the two connecting wires are respectively fixedly connected to two verification conductive posts.

[0014] Preferably, the verification prompt further includes: a contact plate, wherein a contact plate is fixedly installed on each of the two verification conductive posts, and the ends of the two contact plates are respectively arc-shaped structures; the two contact plates are respectively inclined; the positions of the two contact plates are aligned with the contact ring; and there is a gap between the two contact plates and the contact ring.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. The telescopic part can be extended and retracted to adjust its position, thereby adjusting the contact position between the shrink rubber ring and the stern shaft sleeve, improving the service life of the stern shaft sleeve and avoiding long-term localized wear; the frosted surface can be used to contact the inner side of the shrink rubber ring for cleaning and friction, preventing impurities from remaining at the contact point between the inner side of the shrink rubber ring and the stern shaft sleeve; the inner side can be cleaned during the movement of the shrink rubber ring.

[0017] 2. The use of two contact points, along with two lead-out wires, facilitates the use of a multimeter for hazard identification by staff. It utilizes the characteristic that leaked oil no longer retains its insulating properties. Simultaneously, the two contact points can detect excessive wear of the stern shaft bearing causing bending deformation of the ship's stern shaft inside the sealed sleeve. In oil leakage detection, unlike traditional methods that require draining oil and observing emulsification before adjusting oil pressure each time, oil draining is only necessary when the test result shows a clear flow path, thus extending the oil draining inspection cycle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a pressure-adjustable ship stern shaft sealing device according to the present invention.

[0019] Figure 2 This is a cross-sectional view of the internal structure of a pressure-adjustable ship stern shaft sealing device according to the present invention.

[0020] Figure 3 This is a bottom sectional view of a pressure-adjustable ship stern shaft sealing device according to the present invention.

[0021] Figure 4 This is an enlarged view of the sealing mounting component structure of the present invention;

[0022] Figure 5 This is an enlarged view of the telescopic part structure of the present invention;

[0023] Figure 6 For the present invention Figure 3 Enlarged view of the structure of region B in the middle;

[0024] Figure 7 This is an enlarged view of the stern shaft connector structure of the present invention;

[0025] Figure 8 This is a schematic diagram showing the position of the contact piece in this invention;

[0026] Figure 9 This is an enlarged view of the structure of the verification prompt component of the present invention.

[0027] In the attached diagram, the components represented by each number are as follows: 1. Sealing installation component; 101. Sealing sleeve; 102. Sealing outer sleeve; 103. Positioning bolt; 104. Tension spring; 105. Bellows; 2. Telescopic part; 201. Telescopic cylinder; 2011. Positioning hole; 3. Shaft sleeve seal; 301. Inner pressure ring; 3011. Pressure regulating pipe; 302. Outer pressure ring; 303. Sealing ring; 304. Shrinkage rubber ring; 4. Stern shaft connector; 401. Stern shaft sleeve; 4011. Frosted surface; 402. Mixing blade; 403. Electrical connection ring; 5. Calibration indicator component; 501. Calibration conductive post; 502. Connecting wire; 503. Connecting piece. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] This invention provides a technical solution: such as Figures 1 to 9 The pressure-adjustable stern shaft sealing device shown includes a sealing mounting component 1, a telescopic part 2 mounted on the sealing mounting component 1, and a seal between the sealing mounting component 1 and the telescopic part 2; a bushing seal 3 mounted on the telescopic part 2, the telescopic part 2 being used to adjust the position of the bushing seal 3; a stern shaft connector 4 sleeved inside the bushing seal 3; a calibration indicator 5 mounted on the sealing mounting component 1; the sealing mounting component 1 includes a sealing sleeve 101 and a sealing outer sleeve 102, the sealing sleeve 101 having a flange at its end and four sliding grooves on its surface; the sealing outer sleeve 102 being fixedly mounted on the sealing sleeve 101, and a rubber ring being provided inside the sealing outer sleeve 102; and a screw hole being provided on the sealing outer sleeve 102.

[0030] The sealing mounting component 1 further includes: a positioning bolt 103, a tension spring 104, and a bellows 105. The end of the tension spring 104 is fixedly installed at the end of the sealing sleeve 101; the tension spring 104 is located inside the telescopic part 2; the end of the bellows 105 is fixedly installed at the end of the sealing sleeve 101; the flange on the sealing sleeve 101 is used to be installed at the end of the stern tube by bolts; the positioning bolt 103 is internally threaded into the screw hole on the sealing outer sleeve 102, and the end of the positioning bolt 103 has a tapered structure; a rubber insulating layer is provided on the inner side of the sealing sleeve 101; the telescopic part 2 includes: a telescopic cylinder 201 and a positioning hole 2011, which... The telescopic cylinder 201 has four raised strips on its inner side; the telescopic cylinder 201 is slidably sleeved on the sealing sleeve 101; the four raised strips on the inner side of the telescopic cylinder 201 are slidably installed in the four grooves opened on the sealing sleeve 101; the other end of the tension spring 104 is fixedly connected to the inner side of the telescopic cylinder 201; the other end of the bellows 105 is connected to the inner side of the telescopic cylinder 201; a row of positioning holes 2011 is opened on the telescopic cylinder 201; the end of the positioning bolt 103 is inserted into the positioning hole 2011; the bellows 105 is used to seal the telescopic cylinder 201 and the sealing sleeve 101; the bushing seal 3 includes: an inner pressure ring 301 and a pressure regulating pipe 30 11 and outer pressure ring 302, inner pressure ring 301 are attached to telescopic cylinder 201; outer pressure ring 302 is attached to inner pressure ring 301; a bolt is inserted into outer pressure ring 302, and the bolt passes through inner pressure ring 301 and is threaded onto telescopic cylinder 201; pressure regulating pipe 3011 is fixedly installed on inner pressure ring 301, and pressure regulating pipe 3011 is equipped with a valve; pressure regulating pipe 3011 is externally connected to ship pressure regulating oil pump; the telescopic part 2 can extend and retract to adjust its position, thereby adjusting the contact position between the shrinking rubber ring 304 and stern shaft sleeve 401, and improving the service life of stern shaft sleeve 401. In addition, the positioning bolt 103 in this structure facilitates positioning after the telescopic cylinder 201 is adjusted, ensuring that the shrinking rubber ring 304 is positioned at the intervals of a row of frosted surfaces 4011. The bellows 105 can be used to ensure basic sealing and prevent leakage during the telescopic cylinder 201's expansion and contraction adjustment. After adjusting the outward position of the telescopic cylinder 201, the adjusted shrinking rubber ring 304 is still positioned at the intervals of a row of frosted surfaces 4011. After adjustment, the positioning bolt 103 can be threaded onto the sealing outer sleeve 102, and positioned by inserting the end of the positioning bolt 103 into the positioning hole 2011.

[0031] The bushing seal 3 further includes: a sealing ring 303 and a shrinkable rubber ring 304. Two sealing rings 303 are provided, each with a beveled structure. The two sealing rings 303 are respectively fitted inside the inner pressure ring 301 and the outer pressure ring 302. One sealing ring 303 is clamped and fitted between the inner pressure ring 301 and the telescopic cylinder 201. The other sealing ring 303 is clamped and fitted between the inner pressure ring 301 and the outer pressure ring 302. A shrinkable rubber ring 304 is fitted onto the outer side of each of the two sealing rings 303. The shrinkable rubber ring 304 is used for shrinkage... The stern shaft connector 4 includes a stern shaft sleeve 401 and a frosted surface 4011. The stern shaft sleeve 401 has a flange. The stern shaft sleeve 401 is fitted inside two sealing rings 303. A row of frosted surfaces 4011 is provided on the stern shaft sleeve 401, with intervals between them. The two sealing rings 303 are located at the intervals of the row of frosted surfaces 4011. The frosted surfaces 4011 are used to rub against the sealing rings 303. This structure uses a movable and adjustable shrinkable rubber ring 304, which can lift the stern shaft sleeve 401. The service life is extended. When the wear position reaches the point where replacement is required, the contact and sealing position of the shrinkage rubber ring 304 can be adjusted to directly avoid the original diameter reduction wear position, thus allowing continued use without the need for cumbersome replacement of the stern shaft sleeve 401. The structure adjustment is simple and quick, and the direct adjustment method using hydraulic pressure is even more direct, requiring no additional manual or drive source for adjustment, resulting in a more compact structure. The spaced-out frosted surface 4011 allows the shrinkage rubber ring 304 to be in contact with the shrinkage rubber ring when its position is moved and adjusted. The inner side of the 304 ring is cleaned and rubbed to prevent impurities from remaining at the contact point between the inner side of the shrink rubber ring 304 and the stern shaft sleeve 401, which would affect the sealing performance. The repeated friction between the inner side of the shrink rubber ring 304 and the stern shaft sleeve 401 produces black deposits such as deteriorated oil impurities, also known as micro-vibration abrasion debris, which directly affect the sealing performance. At the same time, the abrasive surface 4011 uses a low-mesh sandpaper surface, which is sufficient not to damage the shrink rubber ring 304. Cleaning the shrink rubber ring 304 also helps to extend its service life.

[0032] The stern shaft connector 4 further includes: a mixing blade 402 and a contact ring 403. A ring of mixing blades 402 is fixedly installed on the stern shaft sleeve 401, and the ring of mixing blades 402 is located inside the sealing sleeve 101. A contact ring 403 is sleeved on the outside of the ring of mixing blades 402. The contact ring 403 and the stern shaft sleeve 401 are concentric. The mixing blades 402 rotate with the stern shaft, which can mix the internal oil and improve the uniformity of the oil.

[0033] The verification prompt component 5 includes: two verification conductive posts 501, each fixedly pasted inside a sealing sleeve 101, with insulation between the two posts and the sleeve; a gap exists between the two posts. The component also includes: two connecting wires 502, fixedly inserted into the sealing sleeve 101, each with an insulating layer on its outer side; the wires are fixedly connected to the two posts. Furthermore, the component includes: two connecting plates 503, each fixedly mounted on one of the posts, with arc-shaped ends; the plates are inclined; their positions are aligned with the connecting coil 403; a gap exists between the connecting plates and the coil. The use of two connecting plates 503, along with two lead-out connecting wires 502, facilitates operation. The staff used a multimeter to conduct hazard inspections. This allowed them to utilize the fact that the oil, after seepage, no longer maintained its insulating properties. Furthermore, they could detect bending deformation of the stern shaft caused by excessive wear of the stern shaft bearing inside the sealing sleeve 101. The inspection results were more direct and reliable. Unlike traditional methods, which required draining oil and observing emulsification before adjusting oil pressure, this method simplifies the process. If the test result showed a continuity, it indicated that the oil had leaked, causing insulation failure, or that the increased play due to stern shaft bearing wear caused the stern shaft end to bend and deform downwards under its own weight. This caused the mixing blade 402 and the contact ring 403 to also bend downwards, contacting the two contact pieces 503. Only then did the staff need to drain the oil and observe the emulsification. During normal use, if the test result showed insulation between the two contact wires 502, it indicated that the oil remained sealed and the stern shaft's accuracy was within the normal range.

[0034] Working principle: First, the sealing sleeve 101 is installed on the end of the stern tube with bolts. The internal pressure of the stern tube is adjusted by the pressure regulating oil pump built into the stern tube. When the position of the telescopic cylinder 201 needs to be adjusted, the positioning bolt 103 can be rotated and removed first. When the internal pressure of the stern tube is applied, the oil pressure can push the telescopic cylinder 201 to move outward, adjusting the position of the shrinking rubber ring 304. During the process, the tension spring 104 can elastically pull, and the outward position of the telescopic cylinder 201 can be adjusted as needed. After adjustment, the shrinking rubber ring 304 is still located in the same position. At the interval of the abrasive surface 4011; after adjustment, the positioning bolt 103 can be threaded onto the sealing outer sleeve 102, and the end of the positioning bolt 103 can be inserted into the positioning hole 2011 for positioning; oil can be injected by connecting an external pressure regulating oil pump through the pressure regulating pipe 3011 to adjust the oil pressure between the two shrink rubber rings 304, and after adjustment, the valve on the pressure regulating pipe 3011 can be tightened; when the shrink rubber ring 304 moves to adjust its position, the shrink rubber ring 304 will slide directly over the abrasive surface 4011 to perform cleaning friction work;

[0035] When testing is required, directly connect the two terminals of the multimeter to the two connecting wires 502 respectively. If the test result shows a continuity, it indicates that there is water leakage in the oil, causing the oil insulation to fail, or that the ship's stern shaft bearing is worn, causing the end of the ship's stern shaft to move downward and deform, causing the mixing blade 402 and the electrical coil 403 to also move downward and come into contact with the two electrical contacts 503. At this time, the two electrical contacts 503 are connected. Only then do the staff need to drain the oil to observe the oil emulsification. If the oil does not emulsify, it means that the electrical coil 403 has moved downward and come into contact with the two electrical contacts 503, thus forming a continuity. At this time, the ship's stern shaft has deformed and is no longer concentric with the electrical coil 403, and timely maintenance is required.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure-adjustable stern shaft sealing device for ships, comprising a sealing mounting component (1), wherein a telescopic portion (2) is mounted on the sealing mounting component (1), characterized in that: The sealing mounting part (1) and the telescopic part (2) are sealed together; a bushing seal (3) is installed on the telescopic part (2), and the telescopic part (2) is used to adjust the position of the bushing seal (3); The stern shaft connector (4) is sleeved inside the bushing seal (3). A verification indicator (5) is installed on the sealing mounting component (1); The sealing installation component (1) includes: a sealing sleeve (101) and a sealing outer sleeve (102). The sealing sleeve (101) has a flange at its end and at least one groove is provided on the sealing sleeve (101). The sealing outer sleeve (102) is fixedly installed on the sealing sleeve (101). The sealing outer sleeve (102) has a screw hole. The sealing mounting component (1) further includes: a positioning bolt (103), a tension spring (104), and a bellows (105). The end of the tension spring (104) is fixedly installed at the end of the sealing sleeve (101). The tension spring (104) is located inside the telescopic part (2). The end of the bellows (105) is fixedly installed at the end of the sealing sleeve (101). The flange on the sealing sleeve (101) is installed at the end of the stern tube. The screw hole on the outer sleeve of the sealing sleeve (102) is internally threaded with a positioning bolt (103), and the end of the positioning bolt (103) is tapered. The telescopic part (2) includes: a telescopic cylinder (201) and a positioning hole (2011). The telescopic cylinder (201) has at least one protruding strip on its inner side. The telescopic cylinder (201) is slidably sleeved on the sealing sleeve (101). At least one protruding strip on the inner side of the telescopic cylinder (201) is slidably installed in at least one groove opened on the sealing sleeve (101). The other end of the tension spring (104) is fixedly connected to the inner side of the telescopic cylinder (201). The other end of the bellows (105) is connected to the inner side of the telescopic cylinder (201). A row of positioning holes (2011) is opened on the telescopic cylinder (201). The end of the positioning bolt (103) is inserted into the positioning hole (2011). The bellows (105) is used to seal the telescopic cylinder (201) and the sealing sleeve (101). The bushing seal (3) includes an inner pressure ring (301), a pressure regulating pipe (3011), and an outer pressure ring (302). The inner pressure ring (301) is attached to the telescopic cylinder (201). The outer pressure ring (302) is attached to the inner pressure ring (301). The pressure regulating pipe (3011) is fixedly installed on the inner pressure ring (301). The pressure regulating pipe (3011) is connected to a ship pressure regulating oil pump.

2. The pressure-adjustable ship stern shaft sealing device according to claim 1, characterized in that: The bushing seal (3) further includes: a sealing ring (303) and a shrinking rubber ring (304). There are two sealing rings (303), each with a beveled structure. The two sealing rings (303) are respectively fitted inside the inner pressure ring (301) and the outer pressure ring (302). One of the sealing rings (303) is clamped and fitted between the inner pressure ring (301) and the telescopic cylinder (201). The other sealing ring (303) is clamped and fitted between the inner pressure ring (301) and the outer pressure ring (302). The shrinking rubber ring (304) is fitted on the outside of the two sealing rings (303). The shrinking rubber ring (304) is used to shrink the sealing ring (303).

3. A pressure-adjustable ship stern shaft sealing device according to claim 2, characterized in that: The stern shaft connector (4) includes: a stern shaft sleeve (401) and a frosted surface (4011). The stern shaft sleeve (401) is provided with a flange. The stern shaft sleeve (401) is fitted inside two sealing rings (303). The stern shaft sleeve (401) is provided with a row of frosted surfaces (4011), and there is a gap between the row of frosted surfaces (4011). The two sealing rings (303) are respectively located at the gap of the row of frosted surfaces (4011). The frosted surface (4011) is used to rub the sealing rings (303).

4. A pressure-adjustable ship stern shaft sealing device according to claim 3, characterized in that: The stern shaft connector (4) further includes: a mixing blade (402) and a contact ring (403). A ring of mixing blades (402) is fixedly installed on the stern shaft sleeve (401), and the ring of mixing blades (402) is located inside the sealing sleeve (101). A contact ring (403) is sleeved on the outside of the ring of mixing blades (402). The contact ring (403) and the stern shaft sleeve (401) are concentric.

5. A pressure-adjustable ship stern shaft sealing device according to claim 4, characterized in that: The verification prompt (5) includes: a verification conductive post (501), two verification conductive posts (501) are provided, and the two verification conductive posts (501) are respectively fixedly pasted inside the sealing sleeve (101), and the two verification conductive posts (501) and the sealing sleeve (101) are insulated from each other; there is a gap between the two verification conductive posts (501).

6. A pressure-adjustable ship stern shaft sealing device according to claim 5, characterized in that: The verification prompt (5) further includes: a connecting wire (502), two connecting wires (502) are fixedly inserted into the sealing sleeve (101), and the outer side of the two connecting wires (502) is provided with an insulating layer; the two connecting wires (502) are fixedly connected to the two verification conductive posts (501).

7. A pressure-adjustable ship stern shaft sealing device according to claim 6, characterized in that: The verification prompt (5) further includes: a contact plate (503), on which the two verification conductive posts (501) are respectively fixedly installed, and the ends of the two contact plates (503) are respectively arc-shaped structures; the two contact plates (503) are respectively inclined; the positions of the two contact plates (503) are aligned with the contact ring (403).

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