CN217762061U - Rudder propeller sealing device - Google Patents
Rudder propeller sealing device Download PDFInfo
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- CN217762061U CN217762061U CN202222001219.6U CN202222001219U CN217762061U CN 217762061 U CN217762061 U CN 217762061U CN 202222001219 U CN202222001219 U CN 202222001219U CN 217762061 U CN217762061 U CN 217762061U
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Abstract
The utility model provides a sealing device for a cruise ship rudder propeller, wherein a high-pressure sealing component is sleeved on a rotating shaft; the lip-shaped sealing ring and the isolating ring are sleeved on the rotating shaft; the inner side of the inner isolating ring is pressed on the outer side of the high-pressure sealing assembly; the inner side of the lip-shaped sealing ring in each group of lip-shaped sealing assemblies is pressed on the outer side of the isolating ring; the outer side of the isolating ring is pressed on the inner side of the lip-shaped sealing ring of the adjacent lip-shaped sealing assembly; the inner side of the baffle is pressed on the outer side of the lip-shaped sealing ring positioned on the outer side; the inner side of the sand control ring is pressed on the outer side of the baffle; the step surface of the end cover step hole of the sealing cover is pressed on the outer side of the sand prevention ring. The marine engine has the advantages that the sealing is reliable, the lubricating oil is prevented from leaking into seawater to cause environmental pollution, and the seawater is prevented from entering the ship body to endanger the operation of the ship body; the high-pressure sealing device is suitable for high pressure, and reduces the abrasion of the sealing to the shaft and the abrasion of the sealing; the service life is prolonged, the running safety of the ship is ensured, and the sealing life is ensured to at least meet one docking overhaul period.
Description
Technical Field
The utility model relates to a sealing device, in particular to loose pulley rudderstock sealing device.
Background
The sealing of the pleasure-boat rudder propeller has two functions: firstly, the lubricating oil of the bearing is prevented from leaking into the ocean and polluting seawater; secondly, prevent that sea water from getting into inside, corroding the bearing. The main problems faced are: firstly, the sealing is absolutely reliable, and no leakage exists; secondly, high pressure resistance and high eccentricity are needed.
The existing commonly used oil seal has the following problems:
1. the pressure can not be reached: when the bearing is washed, the pressure of the lubricating grease is designed to be more than 100bar, and sometimes can reach 200bar; the lip seal pressure is typically 0.5bar, which is far from desirable.
2. The service life is not high; when the pressure of the sealing medium is higher, the contact pressure between the sealing lip and the shaft is increased, so that the sealing is quickly abraded, and the service life is shortened.
3. The reliability is not high; when the ship runs for a long time under the working condition with higher pressure, the seal can leak due to abrasion, and the sea is polluted, which is absolutely not allowed by environmental regulations.
SUMMERY OF THE UTILITY MODEL
The sealing device for the steering paddle of the loose pulley provided by the utility model has reliable sealing, ensures that the lubricating oil can not leak to the seawater to cause environmental pollution, and ensures that the seawater can not enter the ship body to endanger the operation of the ship body; the high-pressure sealing device can be suitable for high pressure of 200bar, and reduces the abrasion of the sealing to the shaft and the abrasion of the sealing; the service life is prolonged, the running safety of the ship is ensured, and the sealing life is ensured to at least meet one docking overhaul period; to overcome the disadvantages of the prior art.
The utility model provides a loose pulley rudderstock sealing device, include: the device comprises a rotating shaft 1, a sealing seat 2, a high-pressure sealing assembly 3, a plurality of groups of lip-shaped sealing assemblies 4, a baffle 5, a sand prevention ring 6 and a sealing cover 7; a seat body step hole 21 penetrating through the sealing seat 2 is formed in the sealing seat; one end of the rotating shaft 1 penetrates through a seat body step hole 21 of the sealing seat 2 and extends out of the sealing seat 2; the high-pressure sealing component 3 is sleeved on the rotating shaft 1, the inner side of the high-pressure sealing component is pressed on the end face of the seat body stepped hole 21 of the sealing seat 2, the outer circle of the high-pressure sealing component is pressed on the inner wall of the seat body stepped hole 21 of the sealing seat 2, and the inner circle of the high-pressure sealing component is pressed on the rotating shaft 1; each set of lip seal assemblies 4 comprises: a lip seal 41 and a spacer ring 42; the lip-shaped sealing ring 41 and the isolating ring 42 are sleeved on the rotating shaft 1; the inside of the spacer ring 42 of the inboard lip seal assembly 4 presses against the outside of the high pressure seal assembly 3; the inner side of the lip-shaped sealing ring 41 in each group of lip-shaped sealing components 4 is pressed on the outer side of the isolating ring 42, the outer circle is pressed on the inner wall of the seat body stepped hole 21 of the sealing seat 2, and the inner circle is pressed on the rotating shaft 1; the outer side of spacer ring 42 presses against the inner side of lip seal 41 of the adjacent lip seal assembly 4; the inner side of the baffle 5 is pressed on the outer side of the lip-shaped sealing ring 41 of the lip-shaped sealing assembly 4 positioned on the outer side, and the baffle 5 is positioned in the seat body stepped hole 21 and the end cover stepped hole 71; the inner side of the sand control ring 6 is pressed on the baffle 5, the outer circle is pressed on the inner wall of the end cover stepped hole 71 of the sealing cover 7, and the inner circle is pressed on the rotating shaft 1; the sealing cover 7 has a through end cover step hole 71 inside; the other end of the rotating shaft 1 penetrates through an end cover step hole 71 of the sealing cover 7 and extends out of the sealing cover 7; the step surface of the end cover step hole 71 of the sealing cover 7 is pressed on the outer side of the sand control ring 6.
Further, the utility model provides a loose pulley rudderstock sealing device can also have such characteristic: the sand control ring 6 comprises a fixing part 61, a connecting waist part 62 and a sealing part 63; the connecting waist part 62 is arc-shaped, and two ends of the connecting waist part are respectively connected with the fixing part 61 and the sealing part 63; the baffle 5 and the sealing cover 7 are respectively pressed on two sides of the fixing part 61 of the sand control ring 6; the sealing portion 63 of the sand control collar 6 is pressed against the rotary shaft 1.
Further, the utility model provides a loose pulley rudderstock sealing device can also have such characteristic: the sand control ring 6 is J-shaped.
Further, the utility model provides a loose pulley rudderstock sealing device can also have such characteristic: lip seal 41 includes a back portion 41a, a waist portion 41b, and a lip 41c; the waist portion 41b connects the back portion 41a and the lip 41c.
Further, the utility model provides a loose pulley rudderstock sealing device can also have such characteristic: the high-pressure sealing assembly 3 comprises a lip-shaped high-pressure sealing ring 31, a first framework 32, a second framework 33, a deformation block 34 and a sealing block 35; the first framework 32 and the second framework 33 are embedded in the lip-shaped high-pressure sealing ring 31; the deformation block 34 is located between the first skeleton 31 and the second skeleton 32; the sealing block 35 is fixed on the deformation block 34, and the sealing block 35 is tightly attached to the outer circle of the rotating shaft 1.
Further, the utility model provides a loose pulley rudderstock sealing device can also have such characteristic: the first framework 32 and the second framework 33 are L-shaped; the transverse edge of the L-shaped first framework 32 is positioned at the back of the lip-shaped high-pressure sealing ring 31 and is arranged in parallel with the excircle of the lip-shaped high-pressure sealing ring 31, and the vertical edge of the L-shaped first framework 32 is arranged in parallel with the outer side surface of the lip-shaped high-pressure sealing ring 31; the vertical edge of the L-shaped second framework 33 is parallel to the vertical edge of the L-shaped first framework 32; the end part of the transverse edge of the L-shaped second framework 33 faces the vertical edge of the L-shaped first framework 32; a connecting channel is arranged between the end part of the transverse edge of the L-shaped second framework 33 and the vertical edge of the L-shaped first framework 32; the deformation block 34 is located between the vertical edge of the first frame 32 and the vertical edge of the second frame 33.
Further, the utility model provides a loose pulley rudderstock sealing device can also have such characteristic: the lip-shaped high-pressure seal ring 31 has a notch 31b at the waist; the notch 31b faces the vertical edge of the second frame 33.
Further, the utility model provides a loose pulley rudderstock sealing device can also have such characteristic: the number of lip seal assemblies 4 is 3 groups; the lip of lip seal 41 in the intermediate lip seal assembly 4 faces inwardly; the lip of lip seal 41 in lip seal assemblies 4 on both sides faces outward.
Further, the utility model provides a loose pulley rudderstock sealing device can also have such characteristic: the side wall of any one or more isolating rings 42 is provided with an isolating hole 42a which penetrates through; the seal holder 2 has a seal holder hole 23 communicating with the isolation hole 42 a.
Further, the utility model provides a loose pulley rudderstock sealing device can also have such characteristic: the small end of the seat body step hole 21 is provided with a seal labyrinth groove 22.
Drawings
FIG. 1 is a schematic half-sectional view of a sealing device for a rudder propeller of a cruise ship in an embodiment.
Fig. 2 is a schematic cross-sectional structure of the high-pressure seal assembly in the embodiment.
Fig. 3 is a schematic view of a normal pressure state of the high pressure seal assembly in the embodiment.
Fig. 4 is a schematic diagram of a high pressure state of the high pressure seal assembly in the embodiment.
Fig. 5 is a schematic cross-sectional view of a lip seal in an embodiment.
Fig. 6 is a schematic structural cross-section of the sand control ring in the embodiment.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Examples
In the embodiment, the sealing device for the cruise ship rudder propeller comprises a rotating shaft 1, a sealing seat 2, high- pressure sealing assemblies 3 and 3 groups of lip-shaped sealing assemblies 4, a baffle 5, a sand prevention ring 6 and a sealing cover 7.
The sealing seat 2 provides a mounting space in a whole sealing way, and a seat body step hole 21 penetrating through the sealing seat is formed in the sealing seat; the stepped hole 21 is divided into two sections, the aperture of the small end is matched with the rotating shaft 1, and the large end is matched with the sealing part. The small end of the seat body step hole 21, namely the inner side close to the lubricating grease, is also provided with a sealing labyrinth groove 22 so as to buffer the pressure of the lubricating grease and reduce the pressure bearing of high-pressure sealing.
One end of the rotating shaft 1 penetrates through a seat body stepped hole 21 of the sealing seat 2 and extends out of the sealing seat 2. The high-pressure sealing component 3 is sleeved on the rotating shaft 1, the inner side of the high-pressure sealing component is pressed on the end face of the seat body stepped hole 21 of the sealing seat 2, the outer circle of the high-pressure sealing component is pressed on the inner wall of the seat body stepped hole 21 of the sealing seat 2, and the inner circle of the high-pressure sealing component is pressed on the rotating shaft 1.
In the present embodiment, the high-pressure seal assembly 3 includes: lip-shaped high-pressure seal ring 31, first skeleton 32, second skeleton 33, deformation block 34 and seal block 35.
The lip of the lip-shaped high-pressure sealing ring 31 faces the inner side and is tightly attached to the step surface of the seat body step hole 21, so that grease leakage is prevented. The first rib 32 and the second rib 33 are embedded in the lip-shaped high-pressure seal ring 31. Of course, the lip-shaped high-pressure seal ring 31 has a cavity structure therein for accommodating the first and second bobbins 32 and 33.
The first frame 32 and the second frame 33 are L-shaped. The transverse edge of the L-shaped first framework 32 is positioned on the back of the lip-shaped high-pressure sealing ring 31 and is arranged in parallel with the excircle of the lip-shaped high-pressure sealing ring 31, and the vertical edge of the L-shaped first framework 32 is arranged in parallel with the outer side surface of the lip-shaped high-pressure sealing ring 31. The vertical edge of the L-shaped second framework 33 is parallel to the vertical edge of the L-shaped first framework 32; the ends of the lateral sides of the "L" shaped second frame 33 face the vertical sides of the "L" shaped first frame 32. And a connecting channel is arranged between the end part of the transverse edge of the L-shaped second framework 33 and the vertical edge of the L-shaped first framework 32. The deformation block 34 is located between the vertical edges of the first frame 32 and the second frame 33. The sealing block 35 is fixed on the deformation block 34, and the sealing block 35 is tightly attached to the outer circle of the rotating shaft 1. The lip-shaped high-pressure seal ring 31 has a notch 31b at the waist; the notch 31b faces the vertical edge of the second frame 33. The deformation block 34 is made of rubber, and the sealing block 35 is made of plastic.
When the high-pressure sealing assembly 3 is under normal working pressure, i.e. the lubricating grease is less than or equal to 5bar, as shown in fig. 3: the sealing lip 31a is contacted with the rotating shaft 1 to play a role of sealing; because the pressure is not high, and the function of arc-shaped notch 31b, lip 31a has good elasticity, and the load of the contact part is small, thereby avoiding abrasion.
Under the action of high-pressure grease, the whole lip-shaped high-pressure sealing ring 31 deforms, and the contact part between the lip 31a and the rotating shaft 1 is increased; meanwhile, the waist of the lip-shaped high-pressure sealing ring 31 moves to the left under the action of pressure, the second framework 33 extrudes the rubber block, and the rubber deformation block 34 extrudes the plastic sealing block 35 until the sealing block 35 is contacted with the rotating shaft 1. The resulting media pressure is taken up by the sealing block 35, avoiding further deformation of the waist. The high strength of the sealing block 35 enables the seal to withstand pressures of up to 200 bar. The material of the sealing block 35 is teflon, and the self-lubricating property thereof is enough to endure the abrasion of the rotating shaft 1.
In this embodiment, each set of lip seal assemblies 4 includes: a lip seal 41 and a spacer ring 42; the lip seal 41 and the spacer ring 42 are fitted around the rotary shaft 1. The inner side of the spacer ring 4 of the inner lip seal 4 presses against the outer side of the high-pressure seal 3. The inner side of the lip-shaped sealing ring 41 in each group of lip-shaped sealing assemblies 4 is pressed on the outer side of the isolating ring 42, the outer circle is pressed on the inner wall of the seat body stepped hole 21 of the sealing seat 2, and the inner circle is pressed on the rotating shaft 1. The outer side of spacer ring 42 presses against the inner side of lip seal 41 of the adjacent lip seal assembly 4.
In the present embodiment, the lip seal 41 includes a back portion 41a, a waist portion 41b, and a lip 41c. The waist portion 41b connects the back portion 41a and the lip 41c. The outer circle of the waist portion 41b is closely attached to the inner wall of the large end of the stepped hole 21, and the end of the lip 41c is closely attached to the outer circle of the rotating shaft 1. The back 41a is made of cloth-sandwiched rubber, has higher strength than pure rubber and is convenient to install and position; the waist 41b and the lip 41c are pure rubber. Compared with the common lip seal, the lip thickness is increased, so that the pressure resistance of the lip can reach 5bar; the length of the waist is increased, and the single-side 3mm eccentric amount can be adapted; and no spring is arranged, so that the bearing is prevented from being damaged by the falling of the spring.
In the 3 lip seal assemblies 4, the lip of the middle lip seal 41 faces the inner side; the lip of the lip seal 41 on both sides faces outward. Namely, the lip of the lip-shaped sealing ring 41 at the outer side faces outwards, so that seawater is prevented from entering the ship body; the middle and innermost lip seals 41 are mounted face to face and seal against the gravity oil.
The side walls of the 3 isolating rings 42 are provided with isolating holes 42a which penetrate through; the seal holder 2 has a seal holder hole 23 communicating with the isolation hole 42 a. The isolation hole 42a of the inside isolation ring 42 serves as an observation hole for checking whether the seal is leaked; gravity oil is introduced into the isolation hole 42a of the middle isolation ring 42 to provide lubrication for the lip-shaped seal rings 41 on the left side and the right side, and meanwhile, the pressure of the gravity oil is utilized to balance compressed air, so that the pressure difference borne by the middle lip-shaped seal ring 41 is reduced, the abrasion of the middle lip-shaped seal ring is reduced, and the service life of the middle lip-shaped seal ring is prolonged; compressed air is introduced into the isolation holes 42a of the outer isolation ring 42 to balance the seawater pressure and reduce the pressure difference borne by the outer lip-shaped seal ring 41, so that the abrasion of the outer lip-shaped seal ring is reduced, and the service life of the outer lip-shaped seal ring is prolonged.
The inner side of the baffle 5 is pressed against the outer side of the lip seal 41 of the lip seal assembly 4 on the outer side, and the baffle 5 is located in the seat body stepped hole 21 and the end cover stepped hole 71.
The inner side of the sand control ring 6 is pressed on the baffle 5, the outer circle is pressed on the inner wall of the end cover step hole 71 of the sealing cover 7, and the inner circle is pressed on the rotating shaft 1.
In this embodiment, the sand control collar 6 includes a fixing portion 61, a coupling waist portion 62, and a sealing portion 63. The connecting waist part 62 is arc-shaped, and two ends of the connecting waist part are respectively connected with the fixing part 61 and the sealing part 63; so that the sand control ring 6 is integrally J-shaped. The inner side of the fixing part 61 of the sand control ring 6 is pressed on the outer side of the baffle 5; the sealing portion 63 of the sand control ring 6 is pressed against the rotary shaft 1.
The whole structure of the sand control ring 6 is simple and effective. The curved connection waist 62 makes the seal portion elastic and reduces friction with the rotary shaft 1. The material is polytetrafluoroethylene plastic with self-lubricating property, the strength is enough to seal, and sand stones, fishing nets, aquatic plants, silt and the like in seawater are prevented from invading; wear can be avoided.
The sealing cover 7 is internally provided with a penetrating end cover stepped hole 71; the other end of the rotating shaft 1 passes through the end cover step hole 71 of the sealing cover 7 and extends out of the sealing cover 7. And the step surface of the end cover step hole 71 of the sealing cover 7 is pressed on the outer side of the sand control ring 6. The sealing cover 7 is fixed on the outer side of the sealing seat 2 through bolts, and provides positioning for the whole sealing system, and lip-shaped sealing and high-pressure sealing are prevented from axially moving.
Each member is located outward in the seawater direction and inward in the inner direction of the pleasure boat.
The embodiments described above are only a part of the embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Claims (10)
1. The utility model provides a loose pulley rudder thick liquid sealing device which characterized in that: comprises a rotating shaft (1), a sealing seat (2), a high-pressure sealing assembly (3), a plurality of groups of lip-shaped sealing assemblies (4), a baffle plate (5), a sand prevention ring (6) and a sealing cover (7);
wherein, the sealing seat (2) is internally provided with a seat body step hole (21) which penetrates through;
one end of the rotating shaft (1) penetrates through a seat body stepped hole (21) of the sealing seat (2) and extends out of the sealing seat (2);
the high-pressure sealing assembly (3) is sleeved on the rotating shaft (1), the inner side of the high-pressure sealing assembly is pressed on the end face of the seat body stepped hole (21) of the sealing seat (2), the outer circle of the high-pressure sealing assembly is pressed on the inner wall of the seat body stepped hole (21) of the sealing seat (2), and the inner circle of the high-pressure sealing assembly is pressed on the rotating shaft (1);
each set of lip seal assemblies (4) comprising: a lip seal (41) and a spacer ring (42); the lip-shaped sealing ring (41) and the isolating ring (42) are sleeved on the rotating shaft (1);
the inner side of the isolating ring (42) of the lip seal assembly (4) on the inner side presses against the outer side of the high-pressure seal assembly (3);
the inner side of the lip-shaped sealing ring (41) in each group of lip-shaped sealing assemblies (4) is pressed on the outer side of the isolating ring (42), the outer circle of the lip-shaped sealing ring is pressed on the inner wall of the seat body stepped hole (21) of the sealing seat (2), and the inner circle of the lip-shaped sealing ring is pressed on the rotating shaft (1);
the outer side of the spacer ring (42) is pressed against the inner side of the lip seal ring (41) adjacent to the lip seal assembly (4);
the inner side of the baffle plate (5) is pressed on the outer side of the lip-shaped sealing ring (41) of the lip-shaped sealing assembly (4) on the outer side, and the baffle plate (5) is positioned in the seat body stepped hole (21) and the end cover stepped hole (71);
the inner side of the sand prevention ring (6) is pressed on the outer side of the baffle (5), the outer circle of the sand prevention ring is pressed on the inner wall of the end cover stepped hole (71) of the sealing cover (7), and the inner circle of the sand prevention ring is pressed on the rotating shaft (1);
the sealing cover (7) is internally provided with a penetrating end cover stepped hole (71);
the other end of the rotating shaft (1) penetrates through the end cover step hole (71) of the sealing cover (7) and extends out of the sealing cover (7);
the step surface of the end cover step hole (71) of the sealing cover (7) is pressed on the outer side of the sand control ring (6).
2. The cruise ship rudder propeller sealing device according to claim 1, wherein:
wherein the sand control ring (6) comprises a fixing part (61), a connecting waist part (62) and a sealing part (63);
the connecting waist part (62) is arc-shaped, and two ends of the connecting waist part are respectively connected with the fixing part (61) and the sealing part (63);
the baffle (5) and the sealing cover (7) are respectively pressed on two sides of the fixing part (61) of the sand control ring (6);
the sealing part (63) of the sand control ring (6) is pressed on the rotating shaft (1).
3. The cruise ship rudder propeller sealing device according to claim 1, wherein:
wherein the sand control ring (6) is J-shaped.
4. The cruise ship rudder propeller sealing device according to claim 1, wherein:
wherein the lip seal (41) comprises a back (41 a), a waist (41 b) and a lip (41 c);
the waist portion (41 b) connects the back portion (41 a) and the lip (41 c).
5. The cruise ship rudder propeller sealing device according to claim 1, wherein:
the high-pressure sealing assembly (3) comprises a lip-shaped high-pressure sealing ring (31), a first framework (32), a second framework (33), a deformation block (34) and a sealing block (35);
the first framework (32) and the second framework (33) are embedded into the lip-shaped high-pressure sealing ring (31);
the deformation block (34) being between the first skeleton (32) and the second skeleton (33);
the sealing block (35) is fixed on the deformation block (34), and the sealing block (35) is tightly attached to the outer circle of the rotating shaft (1).
6. The cruise control paddle seal arrangement according to claim 5, wherein:
wherein the first framework (32) and the second framework (33) are L-shaped;
the transverse edge of the L-shaped first framework (32) is positioned at the back of the lip-shaped high-pressure sealing ring (31) and is arranged in parallel with the excircle of the lip-shaped high-pressure sealing ring (31), and the vertical edge of the L-shaped first framework (32) is arranged in parallel with the outer side surface of the lip-shaped high-pressure sealing ring (31);
the vertical side of the L-shaped second framework (33) is parallel to the vertical side of the L-shaped first framework (32); the end part of the transverse side of the L-shaped second framework (33) faces the vertical side of the L-shaped first framework (32);
a connecting channel is arranged between the end part of the transverse edge of the L-shaped second framework (33) and the vertical edge of the L-shaped first framework (32);
the deformation block (34) is located between the vertical edge of the first framework (32) and the vertical edge of the second framework (33).
7. The pleasure-boat rudder propeller sealing device according to claim 6, wherein:
wherein, the waist part of the lip-shaped high-pressure sealing ring (31) is provided with a notch (31 b);
the notch (31 b) faces the vertical edge of the second framework (33).
8. The sealing device for a cruise ship rudder propeller according to claim 1, wherein:
wherein the lip seal assemblies (4) are 3 groups in number;
the lip of the lip seal ring (41) in the middle lip seal assembly (4) faces inwards;
the lip of the lip sealing ring (41) in the lip sealing assembly (4) on two sides faces towards the outer side.
9. The cruise ship rudder propeller sealing device according to claim 1, wherein:
wherein, the side wall of any one or more of the isolating rings (42) is provided with an isolating hole (42 a) which penetrates through;
the sealing seat (2) is provided with a sealing seat hole (23) communicated with the isolation hole (42 a).
10. A cruise control blade seal arrangement according to any of claims 1 to 9, characterized in that:
wherein, the small end of the seat body step hole (21) is provided with a sealing labyrinth groove (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222001219.6U CN217762061U (en) | 2022-08-01 | 2022-08-01 | Rudder propeller sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222001219.6U CN217762061U (en) | 2022-08-01 | 2022-08-01 | Rudder propeller sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217762061U true CN217762061U (en) | 2022-11-08 |
Family
ID=83877231
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222001219.6U Active CN217762061U (en) | 2022-08-01 | 2022-08-01 | Rudder propeller sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217762061U (en) |
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2022
- 2022-08-01 CN CN202222001219.6U patent/CN217762061U/en active Active
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