Water spraying propeller
By setting threaded holes on the shaft tube of the water jet thruster and tightening the impeller shaft with a pinch bolt, the axial squirting problem of the impeller shaft during maintenance is solved, the sealing effect of mechanical seal is ensured, and the safety and reliability of the equipment are improved.
Patent Information
- Application Number
- CN202422326347.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-23
AI Technical Summary
When the water jet thruster is inspected and repaired the thrust bearing seat, the axial movement of the impeller shaft causes changes in the compression amount of the mechanical seal spring, affecting the sealing effect.
A threaded hole is installed on the shaft tube of the water jet thruster, and the impeller shaft is tightened by the pinch bolt. Combined with the sealing structure, it avoids the impeller shaft axial rush and ensures the sealing effect of the mechanical seal.
When inspecting the thrust bearing seat, the impeller shaft is avoided axial twitching, ensuring the sealing effect of mechanical sealing, and improving the safety and reliability of the equipment.
Smart Images
Figure CN223116594U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ship propulsion, and particularly relates to a water jet propeller. Background Art
[0002] A water jet propeller refers to a propeller in which the jet part of the propulsion mechanism is immersed in water and uses the reaction force generated by the jet water flow to drive the ship forward. After the ship equipped with the water jet propeller is launched, the suction pipe of the water jet propeller has a free liquid surface that is the same as the draft of the ship. In order to prevent the water flow from flowing back into the cabin through the suction pipe, the water jet propeller usually uses mechanical seals for sealing. When the mechanical seal is in normal working condition, the spring compression amount is not allowed to be too large or too small. Otherwise, the mechanical seal will fail.
[0003] At present, the mechanical seal of the water jet propeller is limited at one end by a fixing ring on the impeller shaft and at the other end by a gland of the thrust bearing seat to ensure its spring compression amount. Since the thrust bearing of the thrust bearing seat bears the axial thrust of the impeller shaft during operation, it is necessary to frequently disassemble and overhaul to ensure the safety and reliability of the water jet propeller. Each disassembly and overhaul will cause the impeller shaft to axially move, thus affecting the spring compression amount of the mechanical seal and the sealing effect of the mechanical seal. Content of the Utility Model
[0004] In view of the above defects existing in the prior art, the utility model provides a water jet propeller, which optimizes the structure, solves the problem of axial movement of the impeller shaft when overhauling the thrust bearing seat, and ensures the sealing effect of the mechanical seal.
[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:
[0006] A water jet propeller, comprising a housing and an impeller shaft installed with an impeller. The housing is provided with a suction pipe, a drain port and a shaft pipe that communicate with the inner cavity of the housing. The end of the shaft pipe is provided with a thrust bearing seat. One end of the impeller shaft is rotatably arranged in a rectifying seat inside the housing, and the other end of the impeller shaft passes through the shaft pipe and is arranged in the thrust bearing seat. A mechanical seal is arranged between the shaft pipe and the impeller shaft. The mechanical seal is sleeved on the impeller shaft. The shaft pipe is provided with a threaded hole, and a tightening bolt for tightening the impeller shaft is threadedly connected in the threaded hole. The tightening bolt is located at the side of the mechanical seal, and a sealing structure is arranged between the tightening bolt and the inner wall of the threaded hole.
[0007] Wherein, an annular boss is arranged on the outer wall of the shaft pipe, and the threaded hole penetrates through the boss and the shaft pipe.
[0008] Wherein, the threaded hole is a counterbore.
[0009] Among them, the sealing structure is a sealing ring, an annular mounting groove is provided on the tightening bolt, and the sealing ring is arranged in the annular mounting groove.
[0010] Among them, the sealing ring is an O-ring.
[0011] Among them, at least two tightening bolts are provided, and all the tightening bolts are arranged in a circumferential array with the central axis of the shaft tube as the axis.
[0012] Among them, a fixing ring is arranged on the impeller shaft, the mechanical seal is limited between the thrust bearing seat and the fixing ring, and the tightening bolt is located on the side of the fixing ring.
[0013] Among them, after the impeller shaft extends out of the thrust bearing seat, it is connected with a driving flange for connecting with a driving device.
[0014] Among them, the rectifying seat is provided with a mounting through hole, a water-lubricated bearing is arranged in the mounting through hole, the impeller shaft passes through the water-lubricated bearing and is connected with an axial end retaining ring with water passing holes, and the water-lubricated bearing is located between the impeller and the axial end retaining ring.
[0015] Among them, an annular limiting platform for axially limiting the axial end retaining ring is arranged on the inner wall of the mounting through hole.
[0016] By adopting the above technical solutions, the beneficial effects of the present utility model are as follows:
[0017] The water jet thruster provided by the present utility model optimizes the structure. By providing threaded holes on its shaft tube and threadedly connecting tightening bolts for tightening the impeller shaft in the threaded holes, when disassembling the thrust bearing seat for maintenance, the impeller shaft is tightened by the tightening bolts, effectively avoiding the influence of the axial movement of the impeller shaft on the spring compression amount of the mechanical seal and ensuring the sealing effect of the mechanical seal; by providing a sealing structure between the tightening bolt and the hole wall of the threaded hole, the sealing performance at the threaded hole is ensured. Compared with the prior art, the water jet thruster provided by the present utility model solves the problem of the axial movement of the impeller shaft during the maintenance of the thrust bearing seat and ensures the sealing effect of the mechanical seal. Description of the Drawings
[0018] Figure 1 is a schematic structural diagram of the water jet thruster of the present utility model;
[0019] Figure 2 is Figure 1 the sectional view taken along A-A in
[0020] Figure 3 is Figure 2 the enlarged view of a part of the structure in
[0021] In the figure: 1. housing; 11. first housing; 12. second housing; 13. third housing; 2. impeller; 3. impeller shaft; 31. fixing ring; 4. suction pipe; 5. drain port; 6. shaft pipe; 61. boss; 7. thrust bearing seat; 71. seat body; 72. gland; 73. thrust bearing; 8. rectifying seat; 9. mechanical seal; 10. tightening bolt; 14. sealing ring; 15. driving flange; 16. water lubricated bearing; 17. shaft end retaining ring. Specific Embodiment
[0022] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0023] As Figures 1 to 3 shown, this embodiment discloses a water jet propeller, which includes a housing 1 and an impeller shaft 3 installed with an impeller 2. A suction pipe 4, a drain port 5 and a shaft pipe 6 communicating with the inner cavity of the housing 1 are provided on the housing 1. A thrust bearing seat 7 is provided at the end of the shaft pipe 6. One end of the impeller shaft 3 is rotatably arranged in a rectifying seat 8 inside the housing 1, and the other end of the impeller shaft 3 passes through the shaft pipe 6 and is arranged in the thrust bearing seat 7; a mechanical seal 9 is provided between the shaft pipe 6 and the impeller shaft 3. The mechanical seal 9 is sleeved on the impeller shaft 3. A threaded hole is provided on the shaft pipe 6, and a tightening bolt 10 for tightening the impeller shaft 3 is threadedly connected in the threaded hole. The tightening bolt 10 is located at the side of the mechanical seal 9, and a sealing structure is provided between the tightening bolt 10 and the inner wall of the threaded hole.
[0024] The water jet propeller in this embodiment optimizes the structure. By providing a threaded hole on its shaft pipe 6 and threadedly connecting a tightening bolt 10 for tightening the impeller shaft 3 in the threaded hole, when disassembling the thrust bearing seat 7 for maintenance, the impeller shaft 3 is tightened by the tightening bolt 10, effectively avoiding the influence of the axial movement of the impeller shaft 3 on the spring compression amount of the mechanical seal 9 and ensuring the sealing effect of the mechanical seal 9; by providing a sealing structure between the tightening bolt 10 and the hole wall of the threaded hole, the sealing performance at the threaded hole is ensured. Compared with the prior art, the water jet propeller in this embodiment solves the problem of the axial movement of the impeller shaft 3 during the maintenance of the thrust bearing seat 7 and ensures the sealing effect of the mechanical seal.
[0025] For the convenience of assembly, the housing 1 in this embodiment adopts a split structure, including a first housing 11, a second housing 12, and a third housing 13 that are sequentially connected. The drain port 5 is provided on the first housing 11, the suction pipe 4 is provided on the third housing 13, the shaft tube 6 is provided on the suction pipe 4 and is connected to the inner cavity of the housing 1 through the suction pipe 4. The suction pipe 4, the shaft tube 6, and the third housing 13 are integrally provided. At the same time, the first housing 11, the second housing 12, the third housing 13, the drain port 5, and the shaft tube 6 are coaxially arranged.
[0026] In this embodiment, an annular boss 61 is provided on the outer wall of the shaft tube 6, and the threaded hole penetrates through the boss 61 and the shaft tube 6. With such a setting, the depth of the threaded hole is increased, thereby improving the assembly fastening force and reliability of the tightening bolt 10, and further improving the tightening effect when the tightening bolt 10 tightens the impeller shaft 3.
[0027] In order not to affect the appearance of the equipment and the external structure of the equipment, the threaded hole in this embodiment is preferably a counterbore.
[0028] The sealing structure in this embodiment is a sealing ring 14. An annular installation groove is provided on the tightening bolt 10, and the sealing ring 14 is arranged in the annular installation groove.
[0029] Since the O-ring has a self-sealing function and good sealing performance, the sealing ring 14 in this embodiment is preferably an O-ring.
[0030] At least two tightening bolts 10 are provided in this embodiment, and all the tightening bolts 10 are arranged in a circumferential array with the central axis of the shaft tube 6 as the axis. With such a setting, it is ensured that the tightening force received by the circumferential side of the impeller shaft 3 is more balanced, and the occurrence of the situation that the impeller shaft 3 is eccentrically tightened is avoided.
[0031] A fixing ring 31 is provided on the impeller shaft 3 in this embodiment. The mechanical seal 9 is limited between the thrust bearing seat 7 and the fixing ring 31, and the tightening bolt 10 is located on the side of the fixing ring 31. By arranging the tightening bolt 10 at a position close to the mechanical seal 9, the tightening support stability of the impeller shaft 3 at the mechanical seal 9 is improved, and further the axial movement of the impeller shaft 3 affecting the spring compression amount of the mechanical seal 9 is avoided.
[0032] Specifically, the thrust bearing seat 7 includes a seat body 71 and a gland 72 that jointly enclose an installation space, and a thrust bearing 73 arranged in the installation space. The impeller shaft 3 penetrates through the gland 72, the thrust bearing 73, and the seat body 71; the gland 72 of the thrust bearing seat 7 is arranged at the end of the shaft tube 6, and the mechanical seal 9 is axially limited between the gland 72 and the fixing ring 31.
[0033] For the convenience of connection with a driving device (not shown in the figure), the impeller shaft 3 in this embodiment extends out of the thrust bearing seat 7 and is connected with a driving flange 15 for connection with the driving device.
[0034] In this embodiment, the rectifying seat 8 is fixedly arranged on the first housing 11 through support ribs. An installation through-hole is arranged in the rectifying seat 8, and a water-lubricated bearing 16 is arranged in the installation through-hole. The impeller shaft 3 passes through the water-lubricated bearing 16 and is connected with an axial end retaining ring 17 with water passing holes. The water-lubricated bearing 16 is located between the impeller 2 and the axial end retaining ring 17. An annular limiting platform for axially limiting the axial end retaining ring 17 is arranged on the inner wall of the installation through-hole.
[0035] Traditional water jet thrusters do not have a water-lubricated bearing 16. By arranging the water-lubricated bearing 16 in this embodiment, the impeller shaft 3 is supported, the rotational accuracy of the impeller shaft 3 is ensured, and at the same time, the lubricity of water is fully utilized, greatly reducing the wear between the rectifying seat 8 and the impeller shaft 3 and extending the service life of each component.
[0036] During the high-speed operation of the impeller shaft 3, the water-lubricated bearing 16 is prone to slipping and deviating from the axis under the influence of torque and inertial force. By arranging the axial end retaining ring 17, the slipping and deviation of the water-lubricated bearing 16 from the axis are effectively avoided, thus ensuring the normal operation of the water jet thruster; at the same time, the axial end retaining ring 17 also has the function of stabilizing the position of the axial end of the impeller shaft 3, enabling the water jet thruster to achieve higher operation accuracy and efficiency; the arrangement of the annular limiting platform plays a limiting role to prevent the axial end retaining ring 17 from slipping during operation; and by arranging water passing holes on the axial end retaining ring 17, the water passing effect is achieved.
[0037] To ensure the water passing effect, multiple water passing holes are arranged in this embodiment, and all the water passing holes are arranged in a circumferential array with the axis of the axial end retaining ring 17 as the central axis. To further ensure the water passing effect, the water passing holes are preferably oblong in shape in this embodiment. In practical applications, the shape of the water passing holes is not limited.
[0038] When overhauling the thrust bearing seat 7, first screw the tightening bolt 10 to tighten the impeller shaft 3 to prevent the impeller shaft 3 from axially moving, and then disassemble the thrust bearing seat 7 for overhaul; after the overhaul is completed, screw the tightening bolt 10 to disengage the impeller shaft 3 so that the impeller shaft 3 can rotate normally.
[0039] In summary, the water jet thruster of the present utility model solves the problem of axial movement of the impeller shaft 3 when overhauling the thrust bearing seat 7 and ensures the sealing effect of the mechanical seal.
[0040] The present utility model is not limited to the above specific embodiments. Various changes made by those of ordinary skill in the art starting from the above concepts without creative efforts all fall within the protection scope of the present utility model.
Claims
1. A water jet propeller, comprising a housing and an impeller shaft installed with an impeller. A water suction pipe, a drain port and a shaft pipe communicating with the inner cavity of the housing are arranged on the housing. A thrust bearing seat is arranged at the end of the shaft pipe. One end of the impeller shaft is rotatably arranged in a rectifying seat inside the housing, and the other end of the impeller shaft passes through the shaft pipe and is arranged in the thrust bearing seat. A mechanical seal is arranged between the shaft pipe and the impeller shaft, and the mechanical seal is sleeved on the impeller shaft. It is characterized in that, a threaded hole is arranged on the shaft pipe, and a tightening bolt for tightening the impeller shaft is threadedly connected in the threaded hole. The tightening bolt is located at the side of the mechanical seal, and a sealing structure is arranged between the tightening bolt and the inner wall of the threaded hole.
2. The water jet propulsor according to claim 1, wherein, An annular boss is arranged on the outer wall of the shaft pipe, and the threaded hole penetrates through the boss and the shaft pipe.
3. The water jet propeller according to claim 2, characterized in that, The threaded hole is a counterbore.
4. The water jet propulsor according to claim 1, characterized in that, The sealing structure is a sealing ring, and an annular installation groove is arranged on the tightening bolt, and the sealing ring is arranged in the annular installation groove.
5. The water jet propeller according to claim 4, characterized in that, The sealing ring is an O-ring.
6. The water jet propulsor according to claim 1, wherein, At least two tightening bolts are arranged, and all the tightening bolts are arranged in a circumferential array with the central axis of the shaft pipe as the axis.
7. The water jet propeller according to claim 1, characterized in that, A fixing ring is arranged on the impeller shaft, the mechanical seal is limited between the thrust bearing seat and the fixing ring, and the tightening bolt is located at the side of the fixing ring.
8. The water jet propeller according to claim 1, characterized in that, After the impeller shaft extends out of the thrust bearing seat, it is connected with a driving flange for connecting with a driving device.
9. The water jet propulsor according to claim 1, characterized in that, The rectifying seat is provided with an installation through hole, a water lubricated bearing is arranged in the installation through hole, the impeller shaft passes through the water lubricated bearing and is connected with a shaft end retaining ring with water passing holes, and the water lubricated bearing is located between the impeller and the shaft end retaining ring.
10. The water jet propeller according to claim 9, characterized in that, An annular limiting platform for axially limiting the shaft end retaining ring is arranged on the inner wall of the installation through hole.