Flexible mounting structure for waterjet bearing load path optimization

Abstract

The application discloses a flexible mounting structure for bearing load transmission path optimization of a water jet propeller, which comprises a guide vane body, an impeller, a flow channel, an impeller shaft, a vertical plate flange and a flow channel base, wherein the flow channel base is flexibly connected to a ship bottom plate, the vertical plate flange is fixedly connected to a ship stern plate, the lower end of the flow channel is connected to the flow channel base, the upper end of the flow channel extends out of the ship stern plate and is flexibly connected to the vertical plate flange, one end of the impeller shaft extends out of the ship stern plate through the flow channel, the other end of the impeller shaft extends through a ship cabin wall, the guide vane body supports the impeller shaft, and a water-lubricated bearing is arranged between the guide vane body and the impeller shaft, the impeller is arranged on the impeller shaft, a radial support bearing is sleeved on the impeller shaft, the radial support bearing is connected to the flow channel through a bearing seat, a thrust coupling is arranged on the impeller shaft, and the thrust coupling is flexibly connected to the ship cabin wall; the radial support bearing and the water-lubricated bearing bear radial loads, the thrust coupling bears axial loads, the load transmission path is optimized, the axial loads borne by the flow channel are reduced, and the rigidity and the strength of the whole propeller are improved.

Description

Technical Field

[0001] This invention relates to the field of ship propulsion technology, and more specifically to a flexible mounting structure for optimizing the load transfer path of a waterjet propulsion bearing. Background Technology

[0002] Currently, waterjet propulsion has become the mainstream propulsion method for high-performance ships. A typical waterjet propulsion system consists of the following components and power transmission path: Figure 1 As shown, the shaft arrangement of the waterjet propulsion system is that the water-lubricated bearing 6 is supported at one end of the guide vane body 1, and the other end is a combination of radial support bearing 5 and thrust bearing 19 mounted on the bearing seat of the flow channel 3. Ultimately, the flow channel 3 bears the coupled load of huge axial thrust load and small radial support load. Therefore, the installation connection between the waterjet propulsion system and the hull must be rigid. The rigid installation at both ends makes the waterjet propulsion system form an over-constrained statically indeterminate structure, which is difficult to install. Furthermore, the rigid installation structure cannot meet the vibration reduction and impact resistance requirements of the propulsion system. Moreover, since the flow channel 3 needs to withstand the huge axial force of the waterjet propulsion system, the wall thickness of the flow channel 3 needs to be increased, and the bearing seat structure needs to be strengthened accordingly to ensure overall rigidity and strength. The flow channel base 12 also needs to be strengthened by stiffeners to ensure good sealing performance of the flow channel base 12, which ultimately increases the overall weight.

[0003] Therefore, the above-mentioned technologies have problems such as difficult installation of water jet propulsion devices, poor vibration reduction and impact resistance, and low overall stiffness and strength due to the large axial thrust borne by the flow channel. Summary of the Invention

[0004] The technical problem to be solved by this invention is that water jet propulsion is difficult to install, has poor vibration reduction and impact resistance, and suffers from low overall stiffness and strength due to the large axial thrust on the flow channel.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is to provide a flexible installation structure for optimizing the load transmission path of a waterjet propulsion bearing, including a guide vane, an impeller, a flow channel, an impeller shaft, a vertical flange, a stern plate, a flow channel base, and a hull bulkhead. The flow channel base is horizontal and flexibly connected to the bottom plate, the stern plate is perpendicular to the bottom plate, the vertical flange is fixedly connected to the stern plate, the lower end of the flow channel is connected to the flow channel base, and the upper end extends out of the stern plate and connects to the vertical flange. The impeller shaft is parallel to... The impeller shaft extends from the stern plate through the flow channel base and extends through the flow channel at one end, while the other end extends through the ship's bulkhead. The guide vane is located on the end of the impeller shaft that extends out of the stern plate, and a water-lubricated bearing is provided between the guide vane and the impeller shaft. The impeller is located on the impeller shaft and between the guide vane and the stern plate. A radial support bearing is fitted on the impeller shaft, and the radial support bearing is connected to the flow channel through a bearing housing. A thrust coupling is provided on the end of the impeller shaft where the radial support bearing is located, and the thrust coupling passes through the ship's bulkhead and is connected to the ship's bulkhead.

[0006] By adopting the above technical solution, radial support bearings and water-lubricated bearings are set to bear the radial load, and a thrust coupling is set to bear most of the axial load, reducing the axial load borne by the flow channel, optimizing the load transmission path, and improving the overall stiffness and strength.

[0007] Optionally, the flow channel is provided with an outlet flange, which is connected to the vertical plate flange flexible component.

[0008] Optionally, the flexible component is a rubber expansion joint, and the contact points between the outlet flange and the vertical flange and the rubber expansion joint are filled with flat sealant.

[0009] By adopting the above technical solution, flexible components are used to connect the flow channels to compensate for the displacement of the flange end face, and the application of flat sealant can achieve sealing of the interconnected end faces.

[0010] Optionally, the flow channel base is connected to the bottom plate by a resilient vibration isolator.

[0011] Optionally, the lower end of the vibration isolator is fixed to the bottom plate of the ship with bolts, and the upper end is connected to the flow channel base to form a support.

[0012] By adopting the above technical solution and using elastic vibration isolators to connect the flow channel base and the bottom plate, the radial load transmitted from the flow channel can be reduced, thereby reducing the vibration noise of the hull.

[0013] Optionally, the surface on which the flow channel base connects to the bottom plate is provided with a slot, and the bottom plate is provided with a plate, which is inserted into the slot and can slide in the slot.

[0014] Optionally, the slot is provided with an elastic sealing ring, and the elastic sealing ring is pressed against the card plate.

[0015] By adopting the above technical solution, a slotted structure and an elastic sealing ring are used to achieve small displacement compensation between the flow channel base and the bottom plate, as well as dynamic sealing between the two.

[0016] Optionally, a retractable rubber corrugated tube is provided between the flow channel base and the bottom plate of the ship. The upper end of the retractable rubber corrugated tube is fixedly connected to the flow channel base, and the lower end is fixedly connected to the bottom plate of the ship.

[0017] Optionally, the connection between the flow channel base and the retractable rubber corrugated pipe, as well as the connection between the bottom plate and the retractable rubber corrugated pipe, are coated with a flat sealant.

[0018] By adopting the above technical solution, a large axial displacement compensation can be achieved by setting a retractable rubber bellows, and a flat sealant is applied as a second dynamic seal.

[0019] Optionally, a damping block is provided on the end of the thrust coupling that is connected to the ship's bulkhead, and the damping block is connected to the thrust coupling by bolts.

[0020] By adopting the above technical solution, the damping block can reduce the axial load transmitted from the thrust coupling, so that the load can be smoothly transmitted to the hull.

[0021] In summary, the present invention has at least one of the following beneficial effects:

[0022] 1. Radial support bearings and water-lubricated bearings are set up to bear the radial load, and a thrust coupling is set up to bear most of the axial load, reducing the axial load borne by the flow channel, optimizing the vibration transmission path, improving the overall rigidity and strength of the waterjet propeller, and reducing the overall weight of the propeller.

[0023] 2. Multiple flexible structures are set up to connect the waterjet propulsion unit and the hull, which can realize active vibration reduction of the propulsion unit and improve the impact resistance of the waterjet propulsion unit.

[0024] 3. By using a combination of rubber flexible joints and flat sealant, a combination of groove structure and elastic sealing ring, and a variety of sealing structures such as telescopic rubber tubes, the connection between the hull and the propeller is sealed. Attached Figure Description

[0025] Figure 1 For the existing waterjet propulsion structure and force flow transmission path;

[0026] Figure 2 This is the force flow transmission path of the water jet propulsion device of the present invention;

[0027] Figure 3 This is a schematic diagram of the water jet propulsion device of the present invention;

[0028] Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0029] Figure 5 for Figure 2 Enlarged schematic diagram of the flow channel base installation structure at point B;

[0030] Figure 6 for Figure 2 Enlarged schematic diagram of the installation structure of the thrust coupling and vibration damping block at point C;

[0031] In the diagram: 1. Guide vane; 2. Impeller; 3. Flow channel; 4. Impeller shaft; 5. Radial support bearing; 6. Water-lubricated bearing; 7. Thrust coupling; 8. Bulkhead; 9. Vertical flange; 10. Stern plate; 11. Vibration isolator; 12. Flow channel base; 13. Elastic sealing ring; 14. Bottom plate; 15. Telescopic rubber bellows; 16. Rubber joint; 17. Vibration damping block; 18. Clamping plate; 19. Thrust bearing; 20. Coupling. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-6 The present invention will be described in further detail below.

[0033] This invention discloses a flexible mounting structure for optimizing the load transfer path of a waterjet propulsion bearing, with reference to... Figure 2-3 The system includes a guide vane 1, an impeller 2, a flow channel 3, an impeller shaft 4, a vertical flange 9, a stern plate 10, a flow channel base 12, and a bulkhead 8. The flow channel base 12 is horizontally and flexibly connected to the bottom plate 14. The stern plate 10 is perpendicular to the bottom plate 14. The vertical flange 9 and the stern plate 10 are fixedly connected. The lower end of the flow channel 3 is connected to the flow channel base 12, and the upper end extends out of the stern plate 10 and connects to the vertical flange 9. The impeller shaft 4 is parallel to the flow channel base 12, and one end passes through the flow channel 3 and extends out of the stern plate 10. The other end passes through the bulkhead 8. The guide vane 1 is located on the end of the impeller shaft 4 that extends out of the stern plate 10, and a water-lubricated bearing 6 is provided between the guide vane 1 and the impeller shaft 4. The impeller 2 is located on the impeller shaft 4 and between the guide vane 1 and the stern plate 10. A radial support bearing 5 is fitted on the impeller shaft 4. The radial support bearing 5 is connected to the flow channel 3 through a bearing seat. A thrust coupling 7 is provided on the end of the impeller shaft 4 where the radial support bearing 5 is located. The thrust coupling 7 passes through the bulkhead 8 and is connected to the bulkhead 8.

[0034] In use, the guide vane 1, the outlet end of the flow channel 3, and the water-lubricated bearing 6 form a support for one end of the shaft system, bearing part of the radial load of the shaft system. The lower end of the flow channel 3 is supported by the radial support bearing 5 and the flow channel base 12, bearing the other part of the radial load. The axial thrust generated by the impeller 2 is transmitted from the impeller shaft 4 to the thrust coupling 7, and finally to the ship bulkhead 8 structure, realizing the shortest path of thrust transmission, reducing the axial load borne by the flow channel 3, optimizing the load transmission path, and improving the overall rigidity and strength.

[0035] In a further implementation, refer to Figure 4 The vertical flange 9 and the stern plate 10 are rigidly connected by bolts. One end of the outlet flange of the flow channel 3 is flexibly connected to the vertical flange 9. Specifically, a rubber flexible joint 16 is used to connect the outlet flange of the flow channel 3 and the vertical flange 9. Flat sealant is applied between the two flange end faces and the rubber flexible joint 16 to compensate for the displacement of the flange end faces and seal between the two end faces.

[0036] In a further implementation, refer to Figure 5 The flow channel base 12 and the bottom plate 14 are connected by an elastic vibration isolator 11. The lower end of the vibration isolator 11 is fixed to the bottom plate 14 by bolts, and the upper end is connected to the flow channel base 12 to form a support. The vibration isolator 11 reduces the radial load and allows the load to be smoothly transferred to the bottom plate 14.

[0037] In a further implementation, refer to Figure 5 The surface of the flow channel base 12 connected to the bottom plate 14 is provided with a slot, and the bottom plate 14 is provided with a retaining plate 18. The retaining plate 18 is located in the slot and can slide in the slot. An elastic sealing ring 13 is provided in the slot and presses on the retaining plate 18. The slot structure realizes small displacement compensation between the flow channel base 12 and the bottom plate 14, and the elastic sealing ring 13 serves as a dynamic seal.

[0038] In a further implementation, refer to Figure 5 A retractable rubber bellows 15 is also provided between the flow channel base 12 and the bottom plate 14. The upper end of the retractable rubber bellows 15 is fixedly connected to the flow channel base 12, and the lower end is fixedly connected to the bottom plate 14. The connection between the flow channel base 12 and the retractable rubber bellows 15, as well as the connection between the bottom plate 14 and the retractable rubber bellows 15, are coated with flat sealant. The retractable rubber bellows 15 is used to achieve large displacement compensation in the axial direction, and the flat sealant is used as a second dynamic seal.

[0039] In a further implementation, refer to Figure 6 A damping block 17 is provided on one end of the thrust coupling 7 that is connected to the bulkhead 8. The damping block 17 is connected to the thrust coupling 7 by bolts. The thrust coupling 7 is connected to the bulkhead 8. The thrust coupling 8 itself has a damping and vibration absorption function, which can reduce the torsional vibration of the shaft system and compensate for a certain amount of axial vibration displacement. Then, through the damping block 17, axial vibration reduction is achieved. Finally, the axial thrust is smoothly transmitted to the hull structure along the path of thrust coupling 8-dampening block 17-bullet 8.

[0040] In summary, in use, the guide vane 1, the outlet end of the flow channel 3, and the water-lubricated bearing 5 form a support for one end of the shaft system, bearing a portion of the radial load. The outlet end of the flow channel 3 is connected to the vertical flange 9 and the stern plate 10 via a flexible component. The other end is supported by the radial support bearing 5 and the flow channel base 12, bearing another portion of the radial load. The flow channel base 12 and the bottom plate 14 are flexibly connected by a vibration isolator 11 to achieve radial load vibration reduction. A slotted structure and an elastic sealing ring 13 are used to achieve small displacement compensation and dynamic sealing between the flow channel base 12 and the bottom plate 14. A retractable rubber strip is also provided. The invention includes a rubber bellows 15, and applies a flat sealant between the telescopic rubber bellows 15 and the end face of the base of the flow channel 3 and the end face of the bottom plate 14 to achieve large axial displacement compensation and a second dynamic seal. The axial thrust generated during the operation of the impeller 2 is transmitted from the impeller shaft 4 to the thrust coupling 7, and the vibration impact from the shaft system is absorbed by the series damping blocks 17, and finally transmitted to the structure of the ship bulkhead 8. The flow channel 3 only needs to bear the radial load from the shaft system and a small amount of axial load from the guide vane. The invention optimizes the load transmission path, improves the overall stiffness and strength, and achieves a lightweight design of the flow channel.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A flexible mounting structure for optimizing the load transfer path of a waterjet propulsion bearing, characterized in that, The system includes a guide vane (1), an impeller (2), a flow channel (3), an impeller shaft (4), a vertical flange (9), a stern plate (10), a flow channel base (12), and a bulkhead (8). The flow channel base (12) is horizontally and flexibly connected to the bottom plate (14). The stern plate (10) is perpendicular to the bottom plate (14). The vertical flange (9) and the stern plate (10) are fixedly connected. The lower end of the flow channel (3) is connected to the flow channel base (12), and the upper end extends out of the stern plate (10) and is connected to the vertical flange (9). The impeller shaft (4) is parallel to the flow channel base (12) and one end passes through the flow channel (3) and extends out of the stern plate (10). The other end passes through the ship's bulkhead (8). The guide vane (1) is located on one end of the impeller shaft (4) that extends out of the stern plate (10). A water-lubricated bearing (6) is provided between the guide vane (1) and the impeller shaft (4). The impeller (2) is located on the impeller shaft (4) and between the guide vane (1) and the stern plate (10). A radial support bearing (5) is fitted on the impeller shaft (4). The radial support bearing (5) is connected to the flow channel (3) through the bearing seat. A thrust coupling (7) is provided on one end of the impeller shaft (4) where the radial support bearing (5) is located. The thrust coupling (7) passes through the ship's bulkhead (8) and is connected to the ship's bulkhead (8). The flow channel base (12) and the bottom plate (14) are connected by an elastic vibration isolator (11). The lower end of the vibration isolator (11) is fixed to the bottom plate (14) by bolts, and the upper end is connected to the flow channel base (12) to form a support. The flow channel base (12) is provided with a slot on the surface where it connects with the bottom plate (14), and a card plate (18) is provided on the bottom plate (14). The card plate (18) is inserted into the slot and can slide in the slot. The slot is provided with an elastic sealing ring (13), and the elastic sealing ring (13) presses on the card plate (18); The thrust coupling (7) is provided with a damping block (17) at one end connected to the bulkhead (8), and the damping block (17) is connected to the thrust coupling (7) by bolts.

2. The flexible mounting structure for optimizing the load transfer path of the waterjet propeller bearing according to claim 1, characterized in that, The flow channel (3) is provided with an outlet flange, which is connected to the flexible component of the vertical plate flange (9).

3. The flexible mounting structure for optimizing the load transfer path of the waterjet propeller bearing according to claim 2, characterized in that, The flexible component is a rubber expansion joint (16), and the outlet flange and the vertical flange (9) are filled with flat sealant at the contact points with the rubber expansion joint (16).

4. The flexible mounting structure for optimizing the load transfer path of the waterjet propeller bearing according to claim 1, characterized in that, A retractable rubber corrugated pipe (15) is also provided between the flow channel base (12) and the bottom plate (14). The upper end of the retractable rubber corrugated pipe (15) is fixedly connected to the flow channel base (12), and the lower end is fixedly connected to the bottom plate (14).

5. The flexible mounting structure for optimizing the load transfer path of the waterjet propeller bearing according to claim 4, characterized in that, The connection between the flow channel base (12) and the retractable rubber corrugated pipe (15) and the connection between the bottom plate (14) and the retractable rubber corrugated pipe (15) are all coated with flat sealant.

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