Automatic cooling method for gearbox of water-jet propeller

Abstract

According to the automatic cooling method for the gearbox of the water jet propulsion device, the impeller is driven to rotate through the main shaft of the gearbox, so that water flow enters the volute, high pressure is formed in the volute, and when the water flow passes through the jet holes, the water flow is jetted to the cooling copper pipe through the jet holes; lubricating oil in the cooling copper pipe exchanges heat with external high-pressure water flow; the oil pump of the lubricating oil is driven by the main shaft of the gear box, so that the rotating speed of the main shaft is higher, the flowing speed of water flow sprayed out of the cooling copper pipe is higher, the heat exchange efficiency is higher, the heat exchange efficiency of the cooling copper pipe is in direct proportion to the working rotating speed of the main shaft, and the working speed in the gear box is higher; and the heat exchange efficiency of the cooling copper pipe is higher.

Description

Technical Field

[0001] This invention relates to the field of waterjet propulsion technology, and more specifically to an automatic cooling method for a waterjet propulsion gearbox. Background Technology

[0002] When a waterjet propulsion unit is in operation, it is mostly submerged in water. Therefore, the usual cooling method is to directly exchange heat between the water and the propulsion unit's outer shell. However, this method has drawbacks: relying solely on heat exchange between the water and the propulsion unit's outer shell, and then between the outer shell and the working parts of the propulsion unit, results in very low heat exchange efficiency. Therefore, the traditional heat exchange technology has inherent limitations in its implementation.

[0003] Some improvements involve designing cooling pipes outside the water jet propulsion system. However, these cooling pipes also rely on the natural flow of water for heat exchange, so their heat exchange efficiency is not perfect. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide an automatic cooling method for a water jet propulsion gearbox, thereby solving the problem of low cooling efficiency of the water jet propulsion gearbox.

[0005] To solve the above-mentioned technical problems, the present invention provides an automatic cooling method for a water jet propulsion gearbox, comprising: Step S10: The power input shaft (14) of the gearbox (10) receives the horizontally input power; Step S20: The power input shaft (14) of the gearbox (10) drives the vertically arranged drive shaft (13) inside the gearbox (10) through the bevel gear transmission structure (15), and then the drive shaft (13) directly outputs power downward to drive the impeller inside the volute (25) to rotate. Step S30: The impeller rotates and drives the water flow into the volute (25), so that high pressure is formed inside the volute (25); Step S40: When the water flows through the top spray hole (23) inside the volute (25), it is sprayed upward through the spray hole (23) onto the large disc (20) where the cooling copper pipe (30) is located, and the exit direction of the spray hole (23) is directly pointing to the cooling copper pipe (30). Step S50: The hydraulic pump (40) is directly driven by the top of the drive spindle (13) of the gearbox (10), so that the lubricating oil in the lubricating oil chamber (12) is pumped into the cooling copper pipe (30) and heat exchanged with the water jet from the spray hole (23) through the pipe wall. In step S60, the lubricating oil in the cooling copper pipe (30) is driven by the hydraulic pump (40) and flows back to the bearing cavity (11) where the power input shaft (14) of the gearbox (10) is located, and then flows back into the gearbox (10). In step S70, the lubricating oil is transmitted via the power input shaft (14) and bevel gear transmission structure (15) to the lower part of the lubricating oil chamber (12) where the drive shaft (13) of the gearbox (10) is located.

[0006] The circumference of the large disc (20) is also provided with a downwardly positioned mounting well (27), which surrounds the volute (25) and maintains a gap between it and the volute (25) to allow water to flow outward from the gap.

[0007] A gap is maintained between the large disc (20) and the volute (25) to allow water to flow through and down the outer wall of the volute (25).

[0008] Step S70 also includes: an inner conical guide structure (16) designed inside the lubricating oil cavity (12) to make the lubricating oil converge, and then after passing through the diversion hole (17) at the bottom constriction position of the inner conical guide structure (16) to divert to the surrounding area, and then flow upward against the gap between the outer wall of the inner conical guide structure (16) and the inner wall of the gearbox (10) to the lubricating oil suction port of the lubricating oil cavity (12).

[0009] The lubricating oil suction outlet is located on the upper wall of the lubricating oil chamber (12) and is connected to the first outlet hole (22) through a pipeline.

[0010] The drive spindle (13) is connected to the hydraulic pump (40) via a connecting flange.

[0011] The cooling copper tube (30) is arranged in an annular groove on the lower surface of the large disc (20).

[0012] At the coiled position of the cooling copper tube (30), a concave annular groove is provided on the lower surface of the large disc (30), and the cooling copper tube (30) is embedded in the annular groove.

[0013] The lower edge of the cooling copper tube (30) is not higher than the lower surface of the large disk.

[0014] The annular groove is provided with a first outlet hole (22) that extends to the upper surface of the large disc. One end of the cooling copper pipe (30) is connected to the lubricating oil suction port of the lubricating oil chamber (12) of the gearbox (10) through the first outlet hole (22).

[0015] The annular groove is provided with a second outlet hole (21) that extends through to the upper surface of the large disc. The other end of the cooling copper pipe (30) is connected to the oil suction port of the hydraulic pump through the second outlet hole (21) and the second guide pipe (31).

[0016] The third guide pipe (33) is connected from the oil outlet of the hydraulic pump to the bearing cavity of the power input shaft (14) of the drive gearbox.

[0017] This invention provides an automatic cooling method for a water jet propulsion gearbox. The gearbox's main shaft drives an impeller to rotate, causing water to flow into the volute. This creates high pressure inside the volute, allowing the water to be sprayed through nozzles onto cooling copper pipes. This facilitates heat exchange between the lubricating oil inside the cooling copper pipes and the external high-pressure water flow. Simultaneously, the lubricating oil pump is driven by the gearbox's main shaft, resulting in a higher impeller speed and a higher water flow velocity sprayed onto the cooling copper pipes, thus increasing the heat exchange efficiency. Therefore, the heat exchange efficiency of the cooling copper pipes is directly proportional to the operating speed of the volute; the higher the operating speed within the gearbox, the higher the heat exchange efficiency of the cooling copper pipes. Attached Figure Description

[0018] Figure 1 This is a front sectional view of the water jet propulsion device of the present invention.

[0019] Figure 2 This is an axonometric view of the water jet propulsion device of the present invention.

[0020] In the picture: 10-Gearbox; 11-Bearing cavity; 12-Lubricating oil cavity; 13-Drive spindle; 14-Power input shaft; 15-Bevel gear transmission structure; 16-Internal conical guide structure; 17-Flow divider hole; 20-Large disc; 21-Second outlet hole; 22-First outlet hole; 23-Injection hole; 24-Annular groove; 25-Vortex; 27-Installation shaft; 30 - Cooling copper pipe; 31 - Second guide pipe; 32 - First guide pipe; 33 - Third guide pipe; 40 - Hydraulic pump. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] like Figure 1-2 As shown, the present invention provides an automatic cooling method for a water jet propulsion gearbox, comprising: In step S10, the power input shaft 14 of the gearbox 10 receives horizontally input power; this power typically comes from the engine, which is connected to the power input shaft 14 via a coupling. Step S20: The power input shaft 14 of the gearbox 10 drives the vertically arranged drive shaft 13 inside the gearbox 10 through the bevel gear transmission structure 15. The drive shaft 13 then directly outputs power downward to drive the impeller inside the volute 25 to rotate. The bevel gear transmission structure 15 converts the horizontally input power into vertically output power, thereby driving the impeller below to rotate. Step S30: The impeller rotates and drives the water flow into the volute 25, creating high pressure inside the volute 25. The water flow enters the volute 25 from the lower inlet and upwards, thus creating high pressure on the inner wall of the volute 25. In step S40, when the water flows through the top spray hole 23 inside the volute 25, a small portion of the water is sprayed upward through the spray hole 23 onto the large disc 20 where the cooling copper pipe 30 is located under the high pressure of the volute 25. The spray hole 23 is evenly designed around the circumference of the entire volute 25, and the arrangement of the spray hole 23 corresponds to the cooling copper pipe 30, so that the water sprayed from the spray hole 23 is directed towards the cooling copper pipe 30, and heat exchange is completed between the water and the cooling copper pipe, thereby reducing the temperature of the lubricating oil in the cooling copper pipe. Step S50: The top of the drive spindle 13 of the gearbox 10 directly drives the hydraulic pump 40, so that the lubricating oil in the lubricating oil chamber 12 is pumped into the cooling copper pipe 30, and heat is exchanged with the water jet from the spray hole 23 through the pipe wall. In step S60, the lubricating oil in the cooling copper pipe 30 is driven by the hydraulic pump 40 and flows back to the bearing cavity 11 where the power input shaft 14 of the gearbox 10 is located, and then flows back into the gearbox 10, thus completing the cooling effect on the bearing and bevel gear transmission structure. In step S70, the lubricating oil is transmitted via the power input shaft 14 and the bevel gear transmission structure 15 to the lower part of the lubricating oil chamber 12 where the drive spindle 13 of the gearbox 10 is located, thereby achieving the cooling effect on the drive spindle 13.

[0025] The large disc 20 is further provided with a downwardly oriented mounting well 27 around its circumference. The mounting well 27 surrounds the volute 25 and maintains a gap between itself and the volute 25 to allow water to flow outward through the gap. The mounting well 27 not only protects the volute 25 but also acts as an isolation barrier, preventing the water flow from directly mixing with water outside the mounting well. This ensures that the water flow can be directly sprayed onto the cooling copper pipe, exchange heat with the cooling copper pipe, and then flow downward along the gap. In this process, it prevents external water from interfering with the sprayed water flow.

[0026] A gap is maintained between the large disc 20 and the volute 25 to allow water to flow through and down the outer wall of the volute 25.

[0027] Step S70 also includes: an inner conical guide structure 16 designed inside the lubricating oil cavity 12, which allows the lubricating oil to converge, and then be diverted to the surrounding areas through the diversion hole 17 at the bottom constriction position of the inner conical guide structure 16, and then flow upwards against the current to the lubricating oil suction port of the lubricating oil cavity 12 along the gap between the outer wall of the inner conical guide structure 16 and the inner wall of the gearbox 10.

[0028] The lubricating oil suction outlet is located on the upper wall of the lubricating oil cavity 12 and is connected to the first outlet hole 22 through a pipeline.

[0029] The drive spindle 13 is connected to the hydraulic pump 40 via a connecting flange.

[0030] The cooling copper pipe 30 is arranged in an annular groove on the lower surface of the large disc 20.

[0031] At the coiled position of the cooling copper tube 30, a concave annular groove is provided on the lower surface of the large disc 30, and the cooling copper tube 30 is embedded in the annular groove.

[0032] The lower edge of the cooling copper pipe 30 is not higher than the lower surface of the large disk.

[0033] The annular groove is provided with a first outlet hole 22 that extends to the upper surface of the large disc. One end of the cooling copper pipe 30 is connected to the lubricating oil suction port of the lubricating oil chamber 12 of the gearbox 10 through the first outlet hole 22.

[0034] The annular groove is provided with a second outlet hole 21 that extends to the upper surface of the large disc. The other end of the cooling copper pipe 30 is connected to the oil suction port of the hydraulic pump through the second outlet hole 21 and the second guide pipe 31.

[0035] The third guide pipe 33 is connected from the hydraulic pump outlet to the bearing cavity of the power input shaft 14 of the drive gearbox.

[0036] This invention provides an automatic cooling method for a water jet propulsion gearbox. The gearbox's main shaft drives the volute to rotate, allowing water to flow into the volute and creating high pressure inside. This pressure causes the water to be sprayed through the nozzles onto the cooling copper pipes, where the lubricating oil inside the pipes exchanges heat with the high-pressure water. Simultaneously, the lubricating oil pump is driven by the gearbox's main shaft, resulting in a higher impeller speed and a higher water flow velocity sprayed onto the cooling copper pipes, thus increasing the heat exchange efficiency. Therefore, the heat exchange efficiency of the cooling copper pipes is directly proportional to the impeller's operating speed; the higher the operating speed within the gearbox, the higher the heat exchange efficiency of the cooling copper pipes.

[0037] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An automatic cooling method for a gearbox of a water-jet propulsion device, characterized in that, include: Step S10: The power input shaft (14) of the gearbox (10) receives the horizontally input power; Step S20: The power input shaft (14) of the gearbox (10) drives the vertically arranged drive shaft (13) inside the gearbox (10) through the bevel gear transmission structure (15), and then the drive shaft (13) directly outputs power downward to drive the impeller inside the volute (25) to rotate. Step S30: The impeller rotates and drives the water flow into the volute (25), so that high pressure is formed inside the volute (25); Step S40: When the water flows through the top spray hole (23) inside the volute (25), it is sprayed upwards onto the large disc (20) where the cooling copper pipe (30) is located through the spray hole (23), and the ejection direction of the spray hole (23) is directly pointing to the cooling copper pipe (30). Step S50: The hydraulic pump (40) is directly driven by the top of the drive spindle (13) of the gearbox (10), so that the lubricating oil in the lubricating oil chamber (12) is pumped into the cooling copper pipe (30) and heat exchanged with the water jet from the spray hole (23) through the pipe wall. In step S60, the lubricating oil in the cooling copper pipe (30) is driven by the hydraulic pump (40) and flows back to the bearing cavity (11) where the power input shaft (14) of the gearbox (10) is located, and then flows back into the gearbox (10). In step S70, the lubricating oil is transmitted via the power input shaft (14) and bevel gear transmission structure (15) to the lower part of the lubricating oil chamber (12) where the drive shaft (13) of the gearbox (10) is located. The circumference of the large disc (20) is also provided with a downwardly positioned mounting well (27), which surrounds the volute (25) and maintains a gap between it and the volute (25) to allow water to flow outward from the gap. A gap is maintained between the large disc (20) and the volute (25) to allow water to flow through and down the outer wall of the volute (25).

2. The automatic cooling method for a water jet propulsion gearbox according to claim 1, characterized in that, Step S70 also includes: an inner conical guide structure (16) designed inside the lubricating oil cavity (12) to make the lubricating oil converge, and then after passing through the diversion hole (17) at the bottom constriction position of the inner conical guide structure (16) to divert to the surrounding area, and then flow upward against the gap between the outer wall of the inner conical guide structure (16) and the inner wall of the gearbox (10) to the lubricating oil suction port of the lubricating oil cavity (12).

3. The automatic cooling method for a water jet propulsion gearbox according to claim 1, characterized in that, The lubricating oil suction outlet is located on the upper wall of the lubricating oil chamber (12) and is connected to the first outlet hole (22) through a pipeline.

4. The automatic cooling method for a waterjet propulsion gearbox according to claim 1, characterized in that, The drive spindle (13) is connected to the hydraulic pump (40) via a connecting flange.

5. The automatic cooling method for a waterjet propulsion gearbox according to claim 1, characterized in that, The cooling copper tube (30) is arranged in an annular groove on the lower surface of the large disc (20).

6. The automatic cooling method for a waterjet propulsion gearbox according to claim 1, characterized in that, At the coiled position of the cooling copper tube (30), a concave annular groove is provided on the lower surface of the large disc (30), and the cooling copper tube (30) is embedded in the annular groove.

7. The automatic cooling method for a waterjet propulsion gearbox according to claim 1, characterized in that, The lower edge of the cooling copper tube (30) is not higher than the lower surface of the large disk.

8. The automatic cooling method for a waterjet propulsion gearbox according to claim 1, characterized in that, The annular groove is provided with a first outlet hole (22) that extends to the upper surface of the large disc. One end of the cooling copper pipe (30) is connected to the lubricating oil suction port of the lubricating oil chamber (12) of the gearbox (10) through the first outlet hole (22).

9. An automatic cooling method for a waterjet propulsion gearbox according to claim 1, characterized in that, The annular groove is provided with a second outlet hole (21) that extends through to the upper surface of the large disc. The other end of the cooling copper pipe (30) is connected to the oil suction port of the hydraulic pump through the second outlet hole (21) and the second guide pipe (31).

10. An automatic cooling method for a waterjet propulsion gearbox according to claim 1, characterized in that, The third guide pipe (33) is connected from the oil outlet of the hydraulic pump to the bearing cavity of the power input shaft (14) of the drive gearbox.

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