Underwater trenching robot underwater motor heat dissipation system

Abstract

The utility model belongs to underwater motor heat dissipation technical field discloses a kind of underwater trenching robot underwater motor heat dissipation system, including compensator, hydraulic pipe, underwater motor and spiral heat dissipation copper pipe;The compensator is communicated with the internal oil cavity of underwater motor by hydraulic pipe, for balancing the internal and external pressure of underwater motor and providing hydraulic oil supplement;The spiral heat dissipation copper pipe both ends are connected the oil inlet and oil outlet of underwater motor respectively, form closed oil circulation flow channel;The spiral heat dissipation copper pipe is exposed to external environment, and heat exchange of oil and air or water is realized by increasing heat dissipation area;When underwater motor works, rotor rotation drives internal oil passive flow, and oil returns to motor interior after heat dissipation when flowing through spiral heat dissipation copper pipe;The utility model greatly prolongs oil flow path by the spiral structure of spiral heat dissipation copper pipe, increases heat dissipation area, and realizes oil turbulent flow state by optimizing pitch and pipe diameter ratio, significantly reduces motor temperature rise.

Description

Technical Field

[0001] This utility model relates to the field of underwater motor heat dissipation technology, and in particular to an underwater motor heat dissipation system for an underwater trenching robot. Background Technology

[0002] In the field of underwater robotics, especially underwater trenching robots, motor heat dissipation remains a key challenge restricting their long-term stable operation. Current technologies generally employ closed-loop oil cooling systems for underwater motors, relying on direct heat exchange between the internal oil and the external environment (seawater or air) for heat dissipation. However, this traditional cooling method has the following significant drawbacks: Traditional straight-pipe cooling structures suffer from low heat exchange efficiency between the oil and the external medium due to their small surface area and short heat conduction path, making it difficult to meet the continuous cooling requirements of high-power underwater motors. In underwater operating environments, external water pressure varies significantly with depth. Existing compensator structures (such as simple airbags or spring buffer devices) cannot dynamically adjust the pressure inside the motor's oil chamber, easily leading to seal failure or oil leakage. Furthermore, existing cooling systems lack protective designs against marine organisms and impurities clogging the pipes, making them prone to system failure due to blockage of the cooling pipes during long-term operation. Utility Model Content

[0003] The main objective of this invention is to provide a cooling system for the underwater motor of an underwater trenching robot, aiming to solve the technical problem that the traditional straight-pipe cooling structure has low heat exchange efficiency between the oil and the external medium due to its small surface area and short heat conduction path, making it difficult to meet the continuous heat dissipation requirements of high-power underwater motors.

[0004] To achieve the above-mentioned utility model objectives, the first aspect of this utility model proposes an underwater motor heat dissipation system for an underwater trenching robot, including a compensator, a hydraulic pipe, an underwater motor, and a spiral heat dissipation copper pipe. The compensator is connected to the internal oil chamber of the underwater motor via a hydraulic pipe, which is used to balance the internal and external pressure of the underwater motor and provide hydraulic oil replenishment. The spiral heat dissipation copper tube is connected to the oil inlet and oil outlet of the underwater motor at both ends, forming a closed oil circulation channel; The spiral heat dissipation copper tube is exposed to the external environment, and heat exchange between the oil and air or water is achieved by increasing the heat dissipation area. When the underwater motor is working, the rotor rotates, which drives the internal oil to flow passively. The oil is cooled by the spiral heat dissipation copper pipe and then returns to the motor.

[0005] Furthermore, the surface of the spiral heat dissipation copper pipe is provided with heat-enhancing fins, which are made of copper-aluminum composite material and are distributed in a spiral shape.

[0006] Furthermore, the ratio of the pitch to the diameter of the spiral heat dissipation copper tube is 1.5:1 to 3:1, and the diameter range of the spiral heat dissipation copper tube is 5-20mm.

[0007] Furthermore, it also includes temperature sensors and alarm systems; The temperature sensor is located inside the underwater motor or at the oil outlet to monitor the oil temperature in real time. The alarm system is connected to a temperature sensor and will issue an alarm when the temperature exceeds a preset threshold.

[0008] Furthermore, the compensator is a bladder-type compensator, pre-filled with nitrogen and equipped with a spring buffer structure.

[0009] Furthermore, the compensator is connected to the shaft end sealing chamber of the underwater motor via a hydraulic pipe.

[0010] Furthermore, the spiral heat dissipation copper pipe is equipped with a micro turbine structure inside; The micro-turbine structure is driven to rotate by the flow of oil, which enhances oil turbulence and improves heat exchange efficiency.

[0011] Furthermore, the outer wall of the spiral heat dissipation copper tube is coated with an anti-corrosion and thermally conductive coating, and the anti-corrosion and thermally conductive coating is composed of graphene composite material.

[0012] Furthermore, the spiral heat dissipation copper tube is fitted with a removable protective filter.

[0013] Furthermore, the detachable protective filter is woven from corrosion-resistant metal material and is fixed to the underwater motor with screws via a rectangular frame to prevent marine organisms or impurities from clogging the heat dissipation pipes.

[0014] Beneficial effects: 1. The underwater motor cooling system of the underwater trenching robot of this utility model greatly extends the oil flow path and increases the heat dissipation area through the spiral structure of the spiral heat dissipation copper pipe, and achieves the oil turbulence state by optimizing the ratio of screw pitch to pipe diameter, which significantly reduces the motor temperature rise.

[0015] 2. The underwater motor cooling system of the underwater trenching robot of this utility model improves the heat exchange efficiency significantly by combining heat dissipation fins with a micro turbine structure. The turbine is driven by oil to rotate and generate flow disturbance. At the same heat dissipation efficiency, energy is saved.

[0016] 3. The underwater motor cooling system of this utility model for the underwater trenching robot, connected to the shaft end sealing chamber via a bladder-type compensator, can maintain stable oil chamber pressure at a water depth of 2000 meters, extending its service life by 3 times compared to traditional compensators. Double-end mechanical seal contact ensures no oil leakage during long-term operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the underwater motor cooling system of an underwater trenching robot according to an embodiment of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of a spiral heat dissipation copper tube according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the underwater motor cooling system of an underwater trenching robot according to an embodiment of the present invention, after the installation of a detachable protective filter.

[0018] in: 1-Compensator; 2-Hydraulic pipe; 3-Underwater motor; 4-Spiral heat dissipation copper pipe; 41-Heat-enhancing fins; 42-Miniature turbine structure; 5-Removable protective filter.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly and specifically defined.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] Reference Figures 1-3 An embodiment of this utility model provides an underwater motor heat dissipation system for an underwater trenching robot, including a compensator 1, a hydraulic pipe 2, an underwater motor 3, and a spiral heat dissipation copper pipe 4; The compensator 1 is connected to the internal oil chamber of the underwater motor 3 through the hydraulic pipe 2, which is used to balance the internal and external pressure of the underwater motor 3 and provide hydraulic oil replenishment. The spiral heat dissipation copper pipe 4 is connected to the oil inlet and oil outlet of the underwater motor 3 at both ends, forming a closed oil circulation channel; The spiral heat dissipation copper pipe 4 is exposed to the external environment, and the heat exchange between the oil and air or water is achieved by increasing the heat dissipation area; When the underwater motor 3 is working, the rotor rotates, which drives the internal oil to flow passively. The oil is cooled by the spiral heat dissipation copper pipe 4 and then returns to the motor.

[0025] In this embodiment, the compensator 1 forms a dynamic pressure balance system with the internal oil chamber of the underwater motor 3 via the hydraulic pipe 2. When the external water pressure changes, the bladder-type compensator 1 adjusts the oil chamber pressure through the elastic deformation of the pre-filled nitrogen gas inside, ensuring the stability of the sealing structure. The spiral heat dissipation copper pipe 4 preferably adopts a double-layer nested structure, with an inner layer of Φ12mm copper pipe and an outer layer wrapped with a Φ16mm stainless steel protective layer. Both ends are connected to the motor inlet / outlet oil ports via flange quick connectors, forming a closed oil circulation loop. During system operation, the centrifugal force generated by the rotation of the motor rotor causes the oil to form a laminar flow within the spiral heat dissipation copper pipe 4. During the flow, the oil exchanges heat with the external seawater or air, and finally returns to the motor through the outlet to complete the cooling cycle. This structure, by increasing the length of the heat dissipation path and the exposed area, significantly improves the heat dissipation efficiency compared to the traditional straight pipe structure.

[0026] Optionally, the surface of the spiral heat dissipation copper pipe 4 is provided with heat-enhancing fins 41, which are made of copper-aluminum composite material and are distributed in a spiral shape.

[0027] It should be noted that copper-aluminum composite heat-enhancing fins 41 are set on the outer surface of the spiral heat dissipation copper pipe 4. These heat-enhancing fins 41 are formed using a centrifugal casting process. The copper layer is responsible for efficient heat conduction, while the aluminum layer provides an anti-corrosion protective layer. The composite structure increases the heat dissipation area by 2.3 times. This structure can increase the oil temperature drop rate by one-fifth within an ambient temperature range of -10℃ to +50℃, making it particularly suitable for rapid heat dissipation requirements in deep-sea low-temperature environments.

[0028] Optionally, the ratio of the pitch to the diameter of the spiral heat dissipation copper tube 4 is 1.5:1 to 3:1, and the diameter of the spiral heat dissipation copper tube 4 is in the range of 5-20mm.

[0029] It should be noted that when the pitch-to-diameter ratio is 2.4:1, the Reynolds number of the oil reaches the critical value of 2300, forming a turbulent state, at which point the heat transfer coefficient is optimal. Setting the pipe diameter range to 8-15mm ensures sufficient oil flow cross-section (minimum 0.5cm²) while maintaining structural rigidity (maximum deflection ≤0.2mm / m). Furthermore, this parameter configuration can maintain the motor housing temperature below 60℃ even in a 1000-meter water depth environment.

[0030] Optional features include temperature sensors and alarm systems; The temperature sensor is located inside the underwater motor 3 or at the oil outlet to monitor the oil temperature in real time. The alarm system is connected to a temperature sensor and will issue an alarm when the temperature exceeds a preset threshold.

[0031] It should be noted that the temperature sensor uses a PT100 armored platinum resistance thermometer, which can be embedded inside the insulation layer of the motor stator slot. The alarm system includes an audible and visual alarm module and a wireless transmission unit. When the oil temperature is detected to exceed 85°C for 30 consecutive seconds, the system activates a three-level alarm: ① LED flashing to indicate 70°C; ② Buzzer alarm at 80°C; ③ Automatic power cut-off and sending a fault signal at 85°C. This monitoring system reduces the motor overheat protection response time to 12 seconds and the failure downtime rate to 0.3 times / year.

[0032] Optionally, the compensator 1 is a bladder-type compensator, pre-filled with nitrogen and equipped with a spring buffer structure. The compensator 1 is connected to the shaft end sealing chamber of the underwater motor 3 via a hydraulic pipe 2.

[0033] It should be noted that the bladder-type compensator 1 adopts a composite structure of nitrile rubber inner liner and fluororubber outer layer, with the pre-filled nitrogen pressure set at 0.8MPa, and works in conjunction with a disc spring assembly to achieve double buffering. The shaft end sealing chamber adopts a double-end mechanical seal structure, with the dynamic ring made of SiC ceramic and the stationary ring made of graphite impregnated resin.

[0034] Optionally, the spiral heat dissipation copper pipe 4 is provided with a micro turbine structure 42 inside; The micro turbine structure 42 is driven to rotate by the flow of oil, which is used to enhance oil turbulence and improve heat exchange efficiency.

[0035] It should be noted that the micro-turbine structure 42 is composed of 3D-printed titanium alloy blades, with a blade height of 3mm and a blade span angle of 60°, and is arranged on the inner wall of the spiral heat dissipation copper pipe 4 via two mounting rods. When the oil flows, the micro-turbine structure 42 begins to rotate, generating flow disturbances, which greatly improves the heat dissipation efficiency.

[0036] Optionally, the outer wall of the spiral heat dissipation copper pipe 4 is coated with an anti-corrosion and thermally conductive coating, and the anti-corrosion and thermally conductive coating is composed of graphene composite material.

[0037] It should be noted that the anti-corrosion and thermally conductive coating is made of graphene / epoxy resin composite material with a graphene content of 15wt%. This anti-corrosion and thermally conductive coating has good corrosion resistance and thermal conductivity.

[0038] Optionally, a removable protective filter 5 is fitted over the spiral heat dissipation copper pipe 4. The removable protective filter 5 is woven from corrosion-resistant metal material and is fixed to the underwater motor 3 with screws via a rectangular frame to prevent marine organisms or impurities from clogging the heat dissipation pipe.

[0039] It should be noted that the detachable protective filter 5 is made of 316L stainless steel woven mesh with a pore size of 0.5mm and a mesh density of 100 meshes / in². The rectangular frame is fixed to the motor housing flange with hexagonal screws to ensure a seal. This design can filter suspended solids ≥0.3mm and allows for regular cleaning of the detachable protective filter 5, extending the cleaning cycle to 3 months, with a disassembly time of <2 minutes. It significantly reduces the decrease in heat dissipation efficiency caused by marine organism attachment.

[0040] Note: This implementation method achieves three major breakthroughs in the underwater motor 3 heat dissipation system through the above-mentioned structural innovations: ① Establishing a self-circulating heat dissipation system without additional energy consumption; ② Closed-loop control of pressure compensation and temperature monitoring; ③ Multiple protections to ensure long-term reliability in deep-sea environments.

[0041] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural or procedural transformations made based on the contents of the present utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A heat dissipation system for the underwater motor of an underwater trenching robot, characterized in that, It includes a compensator (1), a hydraulic pipe (2), an underwater motor (3), and a spiral heat dissipation copper pipe (4). The compensator (1) is connected to the internal oil chamber of the underwater motor (3) through a hydraulic pipe (2) to balance the internal and external pressures of the underwater motor (3) and provide hydraulic oil replenishment; The spiral heat dissipation copper pipe (4) is connected to the oil inlet and oil outlet of the underwater motor (3) at both ends, forming a closed oil circulation channel; The spiral heat dissipation copper pipe (4) is exposed to the external environment, and the heat exchange between the oil and the air or water is achieved by increasing the heat dissipation area; When the underwater motor (3) is working, the rotor rotates and drives the internal oil to flow passively. When the oil flows through the spiral heat dissipation copper pipe (4), it is cooled and then returns to the motor.

2. The underwater motor cooling system for the underwater trenching robot according to claim 1, characterized in that, The surface of the spiral heat dissipation copper pipe (4) is provided with heat-enhancing fins (41), which are made of copper-aluminum composite material and are distributed in a spiral shape.

3. The underwater motor cooling system for the underwater trenching robot according to claim 1, characterized in that, The ratio of the pitch to the diameter of the spiral heat dissipation copper tube (4) is 1.5:1 to 3:1, and the diameter range of the spiral heat dissipation copper tube (4) is 5-20mm.

4. The underwater motor cooling system for the underwater trenching robot according to claim 1, characterized in that, It also includes temperature sensors and alarm systems; The temperature sensor is installed inside the underwater motor (3) or at the oil outlet to monitor the oil temperature in real time; The alarm system is connected to a temperature sensor and will issue an alarm when the temperature exceeds a preset threshold.

5. The underwater motor cooling system for the underwater trenching robot according to claim 1, characterized in that, The compensator (1) is a bladder-type compensator, which is pre-filled with nitrogen and has a spring buffer structure.

6. The underwater motor cooling system for the underwater trenching robot according to claim 5, characterized in that, The compensator (1) is connected to the shaft end sealing chamber of the underwater motor (3) via a hydraulic pipe (2).

7. The underwater motor cooling system for the underwater trenching robot according to claim 1, characterized in that, The spiral heat dissipation copper pipe (4) is equipped with a micro turbine structure (42). The micro turbine structure (42) is driven to rotate by the flow of oil, which is used to enhance the turbulence of oil and improve the heat exchange efficiency.

8. The underwater motor cooling system for the underwater trenching robot according to claim 1, characterized in that, The outer wall of the spiral heat dissipation copper pipe (4) is coated with an anti-corrosion and heat-conducting coating, and the anti-corrosion and heat-conducting coating is composed of graphene composite material.

9. The underwater motor cooling system for the underwater trenching robot according to claim 1, characterized in that, The spiral heat dissipation copper tube (4) is fitted with a detachable protective filter (5).

10. The underwater motor cooling system for the underwater trenching robot according to claim 9, characterized in that, The detachable protective filter (5) is woven from corrosion-resistant metal material and is fixed to the underwater motor (3) by screws through a rectangular frame to prevent marine organisms or impurities from clogging the heat dissipation pipes.

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