A stern thruster

Abstract

The present invention relates to the field of submarine technology, and in particular to a stern thruster, comprising a housing, a rotating shaft, a propeller and a sealing mechanism. The rotating shaft is installed in the housing, the propeller is installed on the rotating shaft, and the sealing mechanism is installed in the housing. The sealing mechanism comprises a bushing, a sleeve, a dynamic ring, a static ring, a No. 1 leather cup, a No. 2 leather cup and an oil pressure system. A first oil chamber is defined between the No. 1 leather cup, the static ring, the sleeve and the bushing, and a second oil chamber is defined between the No. 2 leather cup, the dynamic ring, the sleeve and the bushing. A stern thruster of the present invention, by providing a housing, a rotating shaft, a propeller and a sealing mechanism, can utilize the end face seal, the seal formed by the first oil chamber and the seal formed by the second oil chamber to cooperate, thereby maintaining the stability and reliability of the entire sealing mechanism and improving the overall sealing effect and sealing performance of the stern thruster.

Description

Technical Field

[0001] The present invention relates to the technical field of submarines, and in particular to a stern propeller. Background Art

[0002] The stern thruster is a key component of submarines and other underwater vehicles, and its performance is directly related to the submarine's navigation efficiency, stability, and safety. Existing submarine stern thrusters face numerous challenges when operating in complex underwater environments. Water pressure is a crucial factor. Submarines navigate deep seas, experiencing immense water pressure, placing extremely high demands on the thruster's sealing performance.

[0003] At present, the sealing mechanism composed of J-shaped leather cups is usually used in the stern thruster. Specifically, the No. 1 leather cup, No. 2 leather cup, No. 3 leather cup and No. 4 leather cup are arranged in sequence along the axial direction of the propeller's rotating shaft and connected to the oil pressure system. The adjacent No. 1 leather cup and No. 2 leather cup face the pressure of seawater. When the seawater passes between the No. 1 leather cup and the No. 2 leather cup, it will come between the No. 2 leather cup and the No. 3 leather cup. The No. 2 leather cup and the No. 3 leather cup form a first oil seal, and the No. 3 leather cup and the No. 4 leather cup form a second oil seal to prevent seawater from entering the inside of the propeller. However, during use, since the water-blocking capacity of the No. 2 leather cup is higher than that of the No. 3 leather cup, once the seawater breaks through the first oil seal, it will be easier to pass through the No. 3 leather cup and enter the second oil seal. This will make the sealing effect of the entire sealing mechanism unable to be guaranteed and needs to be further strengthened. Summary of the Invention

[0004] The present invention provides a stern thruster to solve the problem of poor sealing effect of the existing sealing mechanism.

[0005] A stern thruster of the present invention adopts the following technical solution: a stern thruster for propelling a submarine, comprising an outer shell, a rotating shaft, a propeller and a sealing mechanism; the outer shell is horizontally arranged on the submarine, and the horizontal axis direction of the outer shell is referred to as the first direction, the rotating shaft is coaxially arranged with the outer shell and is installed in the outer shell so as to be rotatable around the first direction, and the propeller is installed on the rotating shaft and can rotate with the rotating shaft; the sealing mechanism is installed in the outer shell, and the sealing mechanism includes a bushing, a sleeve, a dynamic ring, a static ring, a No. 1 leather cup, a No. 2 leather cup and an oil pressure system; the bushing is coaxially arranged with the outer shell and can rotate synchronously with the rotating shaft, the sleeve is coaxially arranged with the outer shell and is located between the outer shell and the bushing; the No. 1 leather cup, the static ring, the dynamic ring and the No. 2 leather cup are arranged in sequence in the first direction and are all located in the sleeve between the cylinder and the bushing; the static ring is located on the side of the dynamic ring close to the propeller in the first direction; the static ring is arranged on the inner circumferential wall of the sleeve and always remains stationary, the dynamic ring is installed on the bushing and abuts against the inner circumferential wall of the sleeve, the dynamic ring can rotate synchronously with the bushing and can move relative to the bushing along the first direction; a sealing cavity is provided at one end of the static ring close to the dynamic ring along the first direction, the sealing cavity is provided on the end face of the static ring and is annular; an oil inlet is provided on the dynamic ring, and the oil inlet can be connected with the sealing cavity; a first oil chamber is defined between the No. 1 leather cup, the static ring, the sleeve and the bushing, and a second oil chamber is defined between the No. 2 leather cup, the dynamic ring, the sleeve and the bushing, and the oil pressure system can respectively transport or extract lubricating oil into or from the first oil chamber and the second oil chamber, thereby circulating the lubricating oil in the first oil chamber and the second oil chamber.

[0006] Furthermore, an oil outlet channel is defined between the stationary ring and the bushing, the oil outlet channel is communicated with the sealing chamber, and the oil pressure system can ensure that the oil pressure in the second oil chamber is always greater than the oil pressure in the first oil chamber.

[0007] Furthermore, the oil pressure system can enable the lubricating oil in the first oil chamber to flow unidirectionally into the second oil chamber.

[0008] Furthermore, two groups of circulating oil holes are provided on the outer shell, and the two groups of circulating oil holes are arranged in sequence in the first direction, one group of circulating oil holes is connected to the oil pressure system and communicated with the first oil chamber, and the other group of circulating oil holes is connected to the oil pressure system and communicated with the second oil chamber.

[0009] Furthermore, the cross section of the No. 1 leather cup perpendicular to the first direction is a J-shaped structure, the No. 1 leather cup and the No. 2 leather cup have the same structure, and the hooks on the No. 1 leather cup and the hooks on the No. 2 leather cup both abut against the bushing.

[0010] Furthermore, the No. 1 leather bowl includes a bowl body and a retaining spring mounted on the bowl body, and the bowl body is a J-shaped structure.

[0011] Furthermore, the end surface of one end of the movable ring abutting against the sleeve is a wedge-shaped surface, and the end surface of one end of the movable ring abutting against the sleeve is in point contact with the sleeve.

[0012] Furthermore, the sleeve includes a first cylinder, a second cylinder, a third cylinder, a fourth cylinder and an end cover; a bearing is sleeved between the outer shell and the rotating shaft, and the first cylinder, the second cylinder, the third cylinder, the fourth cylinder and the end cover are arranged in sequence in the first direction and abut against each other, the first cylinder is located on the side of the end cover close to the bearing in the first direction and abuts against the bearing, and the end cover is fixed to the outer shell; the No. 2 leather cup is arranged between the first cylinder and the second cylinder, the dynamic ring and the static ring are both located between the second cylinder and the bushing, and the static ring is clamped on the second cylinder, and the second oil chamber is defined by the No. 2 leather cup, the dynamic ring, the second cylinder and the bushing; the No. 1 leather cup is arranged between the third cylinder and the fourth cylinder, and the first oil chamber is defined by the No. 2 leather cup, the dynamic ring, the third cylinder and the bushing.

[0013] Furthermore, the sealing mechanism also includes a No. 3 leather cup, the structure of which is the same as that of the No. 1 leather cup, and the No. 3 leather cup is arranged between the fourth cylinder and the end cover.

[0014] Furthermore, it also includes a mating oil chamber, which is located at the end of the bearing away from the propeller in the first direction. The oil pressure system can transport or extract lubricating oil into or out of the mating oil chamber, and make the oil pressure in the mating oil chamber greater than the oil pressure in the first oil chamber and less than the oil pressure in the second oil chamber.

[0015] The beneficial effects of the present invention are as follows: a stern thruster of the present invention is provided with a housing, a rotating shaft, a propeller and a sealing mechanism. When in use, the oil pressure system is used to transport lubricating oil to the first oil chamber and the second oil chamber, so that the first oil chamber and the second oil chamber are sealed respectively, and the lubricating oil in the second oil chamber will prompt the dynamic ring to move along the first direction, so that the dynamic ring approaches the static ring until the static ring abuts the dynamic ring, and the lubricating oil will enter the sealing chamber from the oil inlet hole, forming an end face seal on the end faces of the static ring and the dynamic ring that are close to each other. On the basis of the seals of the first oil chamber and the second oil chamber, the end face seal is added to form a three-layer seal. During the circulation of the lubricating oil, if pressure fluctuations occur and cause seawater to tend to penetrate into the sealing mechanism, the end face seal, the seal formed by the first oil chamber and the seal formed by the second oil chamber can be used to cooperate to maintain the stability and reliability of the entire sealing mechanism, thereby improving the overall sealing effect and sealing performance of the stern thruster. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a schematic diagram of the overall structure of an embodiment of a stern thruster of the present invention;

[0018] Figure 2 It is a front view of the overall structure of an embodiment of a stern thruster of the present invention;

[0019] Figure 3 A side view of the overall structure of an embodiment of a stern thruster of the present invention;

[0020] Figure 4 for Figure 3 Cross-sectional view along the middle line AA;

[0021] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0022] Figure 6 for Figure 5 Enlarged view of point C in the middle.

[0023] In the figure: 100, housing; 110, circulating oil hole; 120, connecting part; 130, bearing; 200, rotating shaft; 210, coupling; 300, propeller; 400, sealing mechanism; 410, bushing; 420, sleeve; 421, first cylinder; 422, second cylinder; 423, third cylinder; 424, fourth cylinder; 425, end cover; 430, dynamic ring; 431, oil inlet hole; 440, static ring; 441, sealing chamber; 442, oil outlet channel; 450, No. 1 leather cup; 460, No. 2 leather cup; 470, first oil chamber; 480, second oil chamber; 490, No. 3 leather cup; 500, motor; 600, mating oil chamber. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] An embodiment of a stern propeller of the present invention is as follows Figures 1 to 6 shown.

[0026] A stern thruster for propelling a submarine comprises a housing 100, a rotating shaft 200, a propeller 300, and a sealing mechanism 400. The housing 100 is horizontally mounted on the submarine, with the horizontal axis of the housing 100 being referred to as a first direction. The rotating shaft 200 is coaxially mounted with the housing 100 and rotatable about the first direction. The propeller 300 is mounted on the rotating shaft 200 and rotates therewith.

[0027] Sealing mechanism 400 is mounted within housing 100 and includes a bushing 410, sleeve 420, a dynamic ring 430, a stationary ring 440, a first cup 450, a second cup 460, and a hydraulic system. Bushing 410 is coaxial with housing 100 and rotates synchronously with shaft 200. Sleeve 420 is coaxial with housing 100 and located between housing 100 and bushing 410.

[0028] The first leather cup 450, the stationary ring 440, the dynamic ring 430, and the second leather cup 460 are arranged in sequence in the first direction and are all located between the sleeve 420 and the bushing 410. The stationary ring 440 is located on the side of the dynamic ring 430 that is closer to the propeller 300 in the first direction. The stationary ring 440 is arranged on the inner circumferential wall of the sleeve 420 and always remains stationary. The dynamic ring 430 is installed on the bushing 410 and abuts against the inner circumferential wall of the sleeve 420. The dynamic ring 430 can rotate synchronously with the bushing 410 and can move relative to the bushing 410 in the first direction. A sealing chamber 441 is defined at one end of the stationary ring 440 that is closer to the dynamic ring 430 in the first direction. The sealing chamber 441 is formed on the end face of the stationary ring 440 and is annular. An oil inlet hole 431 is defined on the dynamic ring 430, and the oil inlet hole 431 can communicate with the sealing chamber 441. A first oil chamber 470 is defined between the first leather cup 450, the stationary ring 440, the sleeve 420, and the bushing 410. A second oil chamber 480 is defined between the second leather cup 460, the dynamic ring 430, the sleeve 420, and the bushing 410. A hydraulic system can deliver or extract lubricating oil to or from the first and second oil chambers 470, 480, respectively, thereby circulating the lubricating oil within the first and second oil chambers 470, 480. The hydraulic system is not shown in the accompanying drawings and is conventional, so its detailed description is omitted.

[0029] Specifically, one end of the rotating shaft 200 is connected to the motor 500 through the coupling 210 . The motor 500 and the propeller 300 are respectively arranged at both ends of the rotating shaft 200 . The motor 500 is used to drive the rotating shaft 200 to rotate in a first direction.

[0030] A keyway is provided on the inner wall surface of the movable ring 430, and the keyway is arranged along the first direction. A spline is provided on the outer wall surface of the bushing 410, and the spline slides with the keyway, so that the movable ring 430 can rotate synchronously with the bushing 410 and can move relative to the bushing 410 along the first direction.

[0031] A connecting member 120 is provided on the rotating shaft 200 . The connecting member 120 is used to connect the rotating shaft 200 and the propeller 300 . The connecting member 120 is a conventional technology and is used to reduce vibration of the propeller 300 .

[0032] This embodiment comprises a housing 100, a rotating shaft 200, a propeller 300, and a sealing mechanism 400. During use, the hydraulic system delivers lubricating oil to the first and second oil chambers 470, 480, respectively, forming seals. The lubricating oil in the second oil chamber 480 causes the dynamic ring 430 to move in a first direction, approaching the stationary ring 440 until the stationary ring 440 abuts the dynamic ring 430. Lubricating oil then enters the sealing chamber 441 through the oil inlet hole 431, forming an end-face seal on the adjacent end faces of the stationary ring 440 and the dynamic ring 430. In addition to the seals in the first and second oil chambers 470, 480, the end-face seal is added to form a three-layer seal.

[0033] During the circulation of the lubricating oil, if pressure fluctuations occur and cause seawater to tend to penetrate into the sealing mechanism 400, the end face seal, the seal formed by the first oil chamber 470, and the seal formed by the second oil chamber 480 can be used to maintain the stability and reliability of the entire sealing mechanism 400, thereby improving the overall sealing effect and sealing performance of the stern thruster.

[0034] When the rotating shaft 200 rotates and drives the moving ring 430 to rotate, the moving ring 430 will rotate relative to the stationary ring 440. After the moving ring 430 rotates relative to the stationary ring 440 for a long time, the end face of the stationary ring 440 will be worn to a certain extent. Since the lubricating oil will cause the moving ring 430 to approach the stationary ring 440, there is always an end face seal on the end faces of the stationary ring 440 and the moving ring 430 that are close to each other.

[0035] In this embodiment, an oil outlet channel 442 is defined between the stationary ring 440 and the bushing 410 , the oil outlet channel 442 is connected to the sealing chamber 441 , and the oil pressure system can ensure that the oil pressure in the second oil chamber 480 is always greater than the oil pressure in the first oil chamber 470 .

[0036] Furthermore, the oil pressure system can enable the lubricating oil in the first oil chamber 470 to flow unidirectionally into the second oil chamber 480 .

[0037] By providing the oil outlet passage 442, once the lubricating oil enters the sealed chamber 441 through the oil inlet hole 431, the oil pressure system regulates the pressures in the first and second oil chambers 470 and 480, ensuring that the oil pressure in the second oil chamber 480 is consistently greater than that in the first oil chamber 470. Specifically, when the oil pressure in the first oil chamber 470 tends to exceed that in the second oil chamber 480, the oil pressure system forces the lubricating oil in the first oil chamber 470 to flow unidirectionally into the second oil chamber 480. Because the oil pressure in the second oil chamber 480 is consistently greater than that in the first oil chamber 470, the lubricating oil in the sealed chamber 441 slowly flows into the first oil chamber 470, compensating for pressure fluctuations caused by oil circulation, maintaining a more stable oil pressure in the first oil chamber 470, and preventing seawater from entering the first oil chamber 470.

[0038] In this embodiment, two groups of circulating oil holes 110 are opened on the housing 100, and the two groups of circulating oil holes 110 are arranged sequentially in the first direction, one group of circulating oil holes 110 is connected to the oil pressure system and communicated with the first oil chamber 470, and the other group of circulating oil holes 110 is connected to the oil pressure system and communicated with the second oil chamber 480.

[0039] Each group of circulating oil holes 110 includes an inlet and an outlet, both of which penetrate the housing 100 and the sleeve 420 in the second direction. The inlet is connected to the oil delivery circuit of the oil pressure system, and the outlet is connected to the oil recovery circuit of the oil pressure system.

[0040] In this embodiment, the cross-section of the No. 1 leather cup 450 perpendicular to the first direction is a J-shaped structure. The No. 1 leather cup 450 and the No. 2 leather cup 460 have the same structure. The hooks on the No. 1 leather cup 450 and the hooks on the No. 2 leather cup 460 are both in contact with the bushing 410, and the hooks on the No. 1 leather cup 450 and the hooks on the No. 2 leather cup 460 are arranged opposite to each other in the first direction.

[0041] The No. 1 leather cup 450 includes a bowl body and a retaining spring mounted on the bowl body. The bowl body is a J-shaped structure, so that the bowl body can remain tight when it abuts against the bushing 410.

[0042] By utilizing the special J-shaped structure of the No. 1 leather cup 450, the No. 1 leather cup 450 and the bushing 410 are in point contact, the contact area at the contact point is reduced as much as possible, the friction is reduced, and the wear degree of the bushing 410 is reduced. In addition, by providing the bushing 410, when the bushing 410 is worn, it is convenient to replace it, avoiding the No. 1 leather cup 450 from directly contacting the rotating shaft 200, causing wear of the rotating shaft 200 and high replacement cost.

[0043] In this embodiment, the end surface of the movable ring 430 that contacts the sleeve 420 is a wedge-shaped surface, and the end surface of the movable ring 430 that contacts the sleeve 420 is in point contact with the sleeve 420 .

[0044] See attached Figure 6 As shown, by making the end surface of the movable ring 430 that abuts the sleeve 420 a wedge-shaped surface, which can be regarded as the hook portion of the No. 1 leather cup 450 being inverted and then abutted against the sleeve 420, the end surface of the movable ring 430 and the sleeve 420 are in point contact with the sleeve 420, minimizing the contact area, reducing friction, and thus reducing the wear of the sleeve 420. A second oil chamber 480 is defined between the No. 2 leather cup 460, the movable ring 430, the sleeve 420, and the bushing 410, forming an oil chamber seal.

[0045] In this embodiment, the sleeve 420 includes a first cylindrical body 421, a second cylindrical body 422, a third cylindrical body 423, a fourth cylindrical body 424, and an end cap 425. A bearing 130 is disposed between the housing 100 and the rotating shaft 200. The first cylindrical body 421, the second cylindrical body 422, the third cylindrical body 423, the fourth cylindrical body 424, and the end cap 425 are sequentially arranged in a first direction and abut against each other. The first cylindrical body 421 is located on the side of the end cap 425 closest to the bearing 130 in the first direction and abuts against the bearing 130. The end cap 425 is fixedly connected to the housing 100. The second leather cup 460 is disposed between the first cylindrical body 421 and the second cylindrical body 422. The dynamic ring 430 and the static ring 440 are both located between the second cylindrical body 422 and the bushing 410. The static ring 440 is clamped to the second cylindrical body 422, and the second cylindrical body 422 restricts the rotation and movement of the static ring 440. The second oil chamber 480 is defined by the second leather cup 460, the rotating ring 430, the second cylinder 422, and the bushing 410. The first leather cup 450 is disposed between the third cylinder 423 and the fourth cylinder 424. The first oil chamber 470 is defined by the second leather cup 460, the rotating ring 430, the third cylinder 423, and the bushing 410.

[0046] In this embodiment, the sealing mechanism 400 also includes a No. 3 leather cup 490. The structure of the No. 3 leather cup 490 is the same as that of the No. 1 leather cup 450. The No. 3 leather cup 490 is arranged between the fourth cylinder 424 and the end cover 425, and the direction of the curved hook on the No. 3 leather cup 490 is the same as the direction of the curved hook on the No. 2 leather cup 460.

[0047] By providing the first cylinder 421, the second cylinder 422, the third cylinder 423, the fourth cylinder 424 and the end cover 425, the installation of the sealing mechanism 400 can be facilitated. That is, during installation, the first cylinder 421 is installed first, so that the first cylinder 421 abuts against the bearing 130, and then the No. 2 leather cup 460 is installed on the first cylinder 421.

[0048] First install the dynamic ring 430 and the static ring 440 on the second cylinder 422, then abut the second cylinder 422 on the first cylinder 421, then abut the third cylinder 423 on the second cylinder 422, then install the No. 1 leather cup 450, then abut the fourth cylinder 424 on the third cylinder 423, then install the No. 3 leather cup 490, finally use the end cover 425 to abut on the fourth cylinder 424, and fix the end cover 425 to the shell 100 to complete the installation.

[0049] The provision of the No. 3 leather cup 490 can play a certain sealing role through the No. 3 leather cup 490, further improving the sealing effect for the stern thruster.

[0050] In this embodiment, a stern thruster also includes a mating oil chamber 600, which is located at one end of the bearing 130 away from the propeller 300 in the first direction. The oil pressure system can transport or extract lubricating oil into or out of the mating oil chamber 600, and make the oil pressure in the mating oil chamber 600 greater than the oil pressure in the first oil chamber 470 and less than the oil pressure in the second oil chamber 480.

[0051] By providing the matching oil chamber 600 , the oil pressure balance among the first oil chamber 470 , the second oil chamber 480 , and the matching oil chamber 600 is maintained by the oil pressure system.

[0052] In combination with the above embodiments, the specific working principle is as follows:

[0053] During use, the hydraulic system delivers lubricating oil to the first and second oil chambers 470, 480, respectively, forming seals. The lubricating oil in the second oil chamber 480 causes the movable ring 430 to move in the first direction, approaching the stationary ring 440 until the stationary ring 440 abuts the movable ring 430. The lubricating oil then enters the sealing chamber 441 through the oil inlet hole 431, forming an end-face seal on the adjacent end faces of the stationary ring 440 and movable ring 430. In addition to the seals in the first and second oil chambers 470, 480, the end-face seal is added, forming a three-layer seal.

[0054] After the lubricating oil enters the sealed chamber 441 through the oil inlet 431, the oil pressure system regulates the pressures in the first and second oil chambers 470 and 480, ensuring that the oil pressure in the second oil chamber 480 is consistently greater than that in the first oil chamber 470. Specifically, when the oil pressure in the first oil chamber 470 tends to exceed that in the second oil chamber 480, the oil pressure system forces the lubricating oil in the first oil chamber 470 to flow unidirectionally into the second oil chamber 480. Because the oil pressure in the second oil chamber 480 is consistently greater than that in the first oil chamber 470, the lubricating oil in the sealed chamber 441 slowly flows into the first oil chamber 470, compensating for pressure fluctuations caused by oil circulation, stabilizing the oil pressure in the first oil chamber 470, and preventing seawater from entering the first oil chamber 470.

[0055] During the circulation of the lubricating oil, if pressure fluctuations occur and cause seawater to tend to penetrate into the sealing mechanism 400, the end face seal, the seal formed by the first oil chamber 470, and the seal formed by the second oil chamber 480 can be used to maintain the stability and reliability of the entire sealing mechanism 400, thereby improving the overall sealing effect and sealing performance of the stern thruster.

[0056] 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 in the scope of protection of the present invention.

Claims

1. A stern thruster, characterized in that: Used to propel a submarine, it includes an outer shell, a rotating shaft, a propeller and a sealing mechanism; the outer shell is horizontally arranged on the submarine, and the horizontal axis direction of the outer shell is called the first direction, the rotating shaft is coaxially arranged with the outer shell and is installed in the outer shell so as to be rotatable around the first direction, and the propeller is installed on the rotating shaft and can rotate with the rotating shaft; the sealing mechanism is installed in the outer shell, and the sealing mechanism includes a bushing, a sleeve, a dynamic ring, a static ring, a No. 1 leather cup, a No. 2 leather cup and an oil pressure system; the bushing is coaxially arranged with the outer shell and can rotate synchronously with the rotating shaft, and the sleeve is coaxially arranged with the outer shell and is located between the outer shell and the bushing; the No. 1 leather cup, the static ring, the dynamic ring and the No. 2 leather cup are arranged in sequence in the first direction and are all located between the sleeve and the bushing; the static ring is located on the side of the dynamic ring close to the propeller in the first direction; the static ring is arranged on the inner circumferential wall of the sleeve and always remains stationary, the dynamic ring is installed on the bushing and abuts against the inner circumferential wall of the sleeve, the dynamic ring can rotate synchronously with the bushing and can It moves in a first direction relative to the bushing; a sealing cavity is provided at one end of the stationary ring close to the moving ring along the first direction, and the sealing cavity is provided on the end face of the stationary ring and is annular; an oil inlet hole is provided on the moving ring, and the oil inlet hole can be connected to the sealing cavity; a first oil cavity is defined between the No. 1 leather cup, the stationary ring, the sleeve and the bushing, and a second oil cavity is defined between the No. 2 leather cup, the moving ring, the sleeve and the bushing, and the oil pressure system can respectively deliver or extract lubricating oil to or from the first oil cavity and the second oil cavity, thereby circulating the lubricating oil in the first oil cavity and the second oil cavity; an oil outlet channel is defined between the stationary ring and the bushing, and the oil outlet channel is connected to the sealing cavity, and the oil pressure system can make the oil pressure in the second oil cavity always greater than the oil pressure in the first oil cavity; two groups of circulating oil holes are provided on the outer shell, and the two groups of circulating oil holes are arranged in sequence in the first direction, one group of circulating oil holes is connected to the oil pressure system and connected to the first oil cavity, and the other group of circulating oil holes is connected to the oil pressure system and connected to the second oil cavity.

2. The stern thruster according to claim 1, characterized in that: The oil pressure system can make the lubricating oil in the first oil chamber flow unidirectionally into the second oil chamber.

3. The stern thruster according to claim 1, characterized in that: The cross section of the No. 1 leather cup perpendicular to the first direction is a J-shaped structure. The No. 1 leather cup and the No. 2 leather cup have the same structure. The hooks on the No. 1 leather cup and the hooks on the No. 2 leather cup both abut against the bushing.

4. The stern thruster according to claim 3, characterized in that: The No. 1 leather bowl includes a bowl body and a retaining spring mounted on the bowl body, and the bowl body is a J-shaped structure.

5. The stern thruster according to claim 1, characterized in that: The end surface of one end of the movable ring abutting against the sleeve is a wedge-shaped surface, and the end surface of the one end of the movable ring abutting against the sleeve is in point contact with the sleeve.

6. The stern thruster according to claim 1, characterized in that: The sleeve includes a first cylinder, a second cylinder, a third cylinder, a fourth cylinder and an end cover; a bearing is sleeved between the outer shell and the rotating shaft, and the first cylinder, the second cylinder, the third cylinder, the fourth cylinder and the end cover are arranged in sequence in the first direction and abut against each other, the first cylinder is located on the side of the end cover close to the bearing in the first direction and abuts against the bearing, and the end cover is fixed to the outer shell; the No. 2 leather cup is arranged between the first cylinder and the second cylinder, the dynamic ring and the static ring are both located between the second cylinder and the bushing, and the static ring is clamped on the second cylinder, and the second oil chamber is defined by the No. 2 leather cup, the dynamic ring, the second cylinder and the bushing; the No. 1 leather cup is arranged between the third cylinder and the fourth cylinder, and the first oil chamber is defined by the No. 2 leather cup, the dynamic ring, the third cylinder and the bushing.

7. The stern thruster according to claim 6, characterized in that: The sealing mechanism also includes a No. 3 leather cup, the structure of which is the same as that of the No. 1 leather cup, and the No. 3 leather cup is arranged between the fourth cylinder and the end cover.

8. The stern thruster according to claim 6, characterized in that: It also includes a mating oil chamber, which is located at the end of the bearing away from the propeller in the first direction. The oil pressure system can deliver or extract lubricating oil into or out of the mating oil chamber, and make the oil pressure in the mating oil chamber greater than the oil pressure in the first oil chamber and less than the oil pressure in the second oil chamber.

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