Independently detachable thrust bearing structure of water-jet propeller
By designing an independently detachable bearing structure on the waterjet propulsion unit, the problem of having to completely disassemble the waterjet propulsion unit to replace the bearing in the prior art has been solved, reducing maintenance costs and improving the circulation and cooling effect of lubricating oil.
Patent Information
- Application Number
- CN202520008132.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2035-01-02
AI Technical Summary
When the bearing structure of the existing waterjet propulsion system is damaged, the entire waterjet propulsion system needs to be disassembled for replacement, resulting in high maintenance costs.
A detachable waterjet propulsion thrust bearing structure was designed, including a bushing, a lock nut, a thrust bearing, an oil distribution ring, a radial support bearing, and a bearing housing. It is connected by a flange, allowing direct disassembly and assembly from the outside of the stern, avoiding the need to disassemble the entire waterjet propulsion system.
It enables bearing replacement without disassembling the waterjet propulsion unit, reducing maintenance costs, and improves lubricant circulation and cooling through an improved oil circuit design.
Smart Images
Figure CN223563304U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of independently detachable water jet propeller thrust bearing structure, belong to ship propeller technical field. BACKGROUND
[0002] Water jet propeller is a kind of ship propeller, generally include moving vane, guide vane body, import flow channel, impeller shell, nozzle, impeller shaft and other main components, such as Figure 1 Import flow channel 16, impeller shell 14, nozzle 11 constitute the flow duct of water jet propeller;With the rotation of impeller shaft 15 connected moving vane 13 in pipeline, generate thrust;Guide vane body 12 is behind moving vane 13, play to connect stern plate, rectification, transfer load and other functions;Impeller shaft 15 transfer torque from main machine. Figure 2 It is a kind of typical bearing structure suitable for large water jet propelling device, include a thrust bearing and a radial support bearing, in the sealed bearing cavity composed of guide vane body hub and other components, operate in cavity, filled with lubricating oil.This bearing structure is installed in place when water jet propeller is assembled, then water jet propeller is installed on the ship as a whole.
[0003] The above-mentioned bearing structure has the following technical defects: once bearing is damaged, only water jet propeller can be disassembled from the ship as a whole to replace, and the maintenance cost is higher. INVENTION CONTENTS
[0004] The utility model solves the technical problems that: provide a kind of bearing structure should be independently detachable, and the water jet propeller thrust bearing structure of water jet propeller whole dismounting is not needed.
[0005] In order to solve the above problems, the utility model provides a kind of independently detachable water jet propeller thrust bearing structure, it includes the shaft sleeve of sleeve in impeller shaft outside, shaft sleeve is successively sleeved with lock nut, thrust bearing, oil distribution ring, radial support bearing in the direction of impeller shaft end to root, thrust bearing and radial support bearing are equipped with bearing box outside, and bearing box is connected with guide vane body;Bearing cover is equipped between the bearing box and impeller shaft.Independent dismounting can be carried out from the stern of the ship after water jet propeller is installed on the ship body, avoid the procedure of dismounting bearing first dismounting propeller, save maintenance cost.Because the flange of bearing box is located at the outlet end of guide vane body, therefore, after water jet propeller is installed on the ship, maintenance personnel can directly dismount bearing box from the outlet position of water jet propeller of the stern of the ship, without needing to dismount bearing box after water jet propeller is dismounted from the ship.
[0006] Preferably, the shaft sleeve is limited by lock nut.
[0007] More preferably, a spacer is arranged between the lock nut and the thrust bearing. The shaft sleeve is a cylindrical structure, which is sleeved on the impeller shaft and rotates with the shaft, and the bearing is pressed by the lock nut and the spacer.
[0008] Preferably, a toothed flange is arranged on the bearing box, which is connected to the hub of the guide vane body by bolts. The toothed structure can avoid the interference of the guide vane blades, maximize the inner diameter of the bearing box, and ensure the size of the internal bearing.
[0009] Preferably, two oil inlet holes and oil outlet holes are arranged in the middle of the bearing box for the inflow of external lubricating oil and the outflow of internal lubricating oil.
[0010] More preferably, the surface of the oil distribution ring has a groove, which is in communication with the oil inlet hole, and a through hole is arranged in the groove for the inflow of oil into the inner cavity of the thrust bearing, which is beneficial to the circulation and heat dissipation of the oil in the bearing cavity.
[0011] Preferably, the oil distribution ring is a circular ring.
[0012] Further, a mechanical seal structure is arranged between the shaft sleeve and the bearing cover. A mechanical seal is arranged between the rotating shaft sleeve and the stationary bearing cover to prevent the lubricating oil in the bearing cavity from leaking to the outside.
[0013] Preferably, the bearing cover is a circular truncated cone, and the structure of the circular truncated cone makes the axial space in the bearing cavity larger.
[0014] Preferably, the bearing cover is connected to the bearing box by a flange and bolts.
[0015] Compared with the existing bearing structure of the water jet propeller, the bearing structure of the water jet propeller can be independently replaced without being removed from the ship, and the maintenance cost is low. At the same time, the oil passage is extended by the oil distribution ring in the bearing cavity, the distance between the oil inlet hole and the oil outlet hole is increased, the oil is fully circulated in the bearing cavity, and the cooling effect is good. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a schematic view of the existing water jet propeller;
[0017] Figure 2 is a schematic view of the existing bearing structure suitable for large water jet propelling device;
[0018] Figure 3 is a schematic view of the bearing structure of the water jet propeller provided by the embodiment;
[0019] Figure 4 is a schematic view of the toothed flange on the bearing box;
[0020] Figure 5 is a front view of the toothed flange;
[0021] Figure 6 For Figure 5 side view. DETAILED DESCRIPTION
[0022] In order to make the utility model more obvious and easy to understand, the preferred embodiment is described in detail below with the help of the drawings.
[0023] Embodiment
[0024] As Figure 3 shown, the utility model provides a kind of independently detachable water jet propeller thrust bearing structure, it includes the shaft sleeve 7 of sleeve in impeller shaft outside, shaft sleeve 7 outer along the direction of impeller shaft end to root is successively sleeved with locking nut 1, cushion block 2, thrust bearing 3, oil distribution ring 5, radial support bearing 6, thrust bearing 3 and radial support bearing 6 are equipped with bearing box 4, bearing box 4 is connected with guide vane body;The bearing cover 8 is equipped between bearing box 4 and impeller shaft.Independent detachable water jet propeller can be installed on the ship after, directly disassembles from ship stern outside, avoids the procedure to be dismantled bearing first dismantles propeller, saves maintenance cost.Because the flange of bearing box is located at the outlet end of guide vane body, maintenance personnel can directly dismantle bearing box from the outlet position of ship stern water jet propeller after water jet propeller is installed on the ship, without needing to first dismantle water jet propeller from the ship, then dismount bearing box.
[0025] The shaft sleeve 7 is limited by locking nut 1, and cushion block 2 is arranged between locking nut 1 and thrust bearing 3.The shaft sleeve is cylindrical structure, and the shaft sleeve is sleeved on the impeller shaft, rotates with the shaft, and the bearing is pressed by locking nut and cushion block.
[0026] The bearing box 4 is provided with a toothed flange 10 (as shown in Figures 4-6 ), which is connected to the hub of the guide vane body by bolts.The toothed structure can avoid the interference of the flange with the blades of the guide vane body, maximize the inner diameter of the bearing box, and ensure the size of the installed bearing inside.
[0027] The middle part of the bearing box 4 is provided with two oil inlet holes and oil outlet holes for the inflow of external lubricating oil and the outflow of internal lubricating oil.The surface of the oil distribution ring 5 has a groove, which is in communication with the oil inlet hole, and the groove has a through hole for allowing oil to flow into the inner cavity of the thrust bearing 3, which is beneficial to the circulation and heat dissipation of oil in the bearing cavity.The oil distribution ring 5 is a circular ring.The mechanical seal structure 9 is arranged between the shaft sleeve 7 and the bearing cover 8.A mechanical seal is arranged between the rotating shaft sleeve and the stationary bearing cover to prevent the lubricating oil in the bearing cavity from leaking to the outside.
[0028] The bearing cover 8 is a circular truncated cone, and the structure of the circular truncated cone makes the axial space in the bearing cavity larger.The bearing cover 8 is connected to the bearing box by a flange and bolts.
Claims
1. A waterjet thruster thrust bearing structure that is independently removable, characterized by, The shaft sleeve (7) is sleeved outside the impeller shaft, and the shaft sleeve (7) is sequentially sleeved with a locking nut (1), a thrust bearing (3), an oil distribution ring (5) and a radial support bearing (6) from the end to the root of the impeller shaft, the thrust bearing (3) and the radial support bearing (6) are provided with a bearing box (4) outside, and the bearing box (4) is connected with a guide vane body; a bearing cover (8) is arranged between the bearing box (4) and the impeller shaft.
2. The independently demountable waterjet thruster bearing structure of claim 1, wherein, The shaft sleeve (7) is limited by the locking nut (1).
3. The self-contained waterjet thruster bearing structure of claim 2, wherein, A gasket (2) is arranged between the locking nut (1) and the thrust bearing (3).
4. The self-contained waterjet thruster bearing structure of claim 1, wherein, A toothed flange (10) is arranged on the bearing box (4), and the toothed flange (10) is connected with a hub of the guide vane body through bolts.
5. The self-contained waterjet thruster bearing structure of claim 1 wherein, Two oil inlet holes and oil outlet holes for flowing in and out of external lubricating oil and internal lubricating oil are respectively arranged in the middle of the bearing box (4).
6. The self-contained waterjet thruster bearing structure of claim 5, wherein, The surface of the oil distribution ring (5) is provided with a groove, the groove is communicated with the oil inlet hole, and a through hole for flowing oil into the inner cavity of the thrust bearing (3) is arranged in the groove.
7. The self-contained waterjet thruster bearing structure of claim 1 wherein, The oil distribution ring (5) is a circular ring.
8. The self-contained waterjet thruster bearing structure of claim 6, wherein, A mechanical sealing structure (9) is arranged between the shaft sleeve (7) and the bearing cover (8).
9. The self-contained waterjet thrust bearing assembly of claim 1 wherein, The bearing cover (8) is a circular truncated cone.
10. The self-contained waterjet thruster bearing structure of claim 1, wherein, The bearing cover (8) is connected with the bearing box through a flange and bolts.