A cooling system for a marine propulsion device and a marine propulsion device

Abstract

The present invention relates to the technical field of cooling systems, and provides a marine propulsion equipment cooling system and a marine propulsion equipment. The cooling system of the marine propulsion equipment is used to achieve heat dissipation and cooling of the marine propulsion equipment, and includes a first cooling circuit, a heat exchanger, and a second cooling circuit; the first cooling circuit is heat-transfer connected to the heat-generating component of the marine propulsion equipment, and the second cooling circuit is heat-transfer connected to the first cooling circuit through the heat exchanger, so as to achieve the cooling and heat dissipation of the marine propulsion equipment through the heat transfer among the heat-generating component, the first cooling circuit, the heat exchanger, and the second cooling circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling systems, and particularly to the cooling and heat exchange of heat-generating components of a marine propulsion device. Background Art

[0002] Marine propulsion equipment is usually used to provide propulsion power for inflatable rafts, speedboats, sailboats, fishing boats, canoes, etc. It generally uses an electric motor or an engine as its power source. The power source is connected to a propeller through a transmission shaft, and the propulsion power is provided by driving the propeller to rotate. When the electric motor or engine runs at high speed, a large amount of heat will be generated. If the heat cannot be discharged in time, it may cause the power source or other modules to malfunction, stop running or even be damaged due to overheating, reducing the reliability of the entire propulsion equipment. Therefore, an efficient and reliable cooling system is needed to cool down the power source or other modules.

[0003] Many traditional gasoline engines or diesel engines adopt external circulation cooling. For example, traditional outboard motors such as Yamaha and Mercury mainly adopt an open-loop circulation method, that is, a drive shaft drives a water pump to pump water from the natural water outside to cool the power source of the marine propulsion equipment. Although the open-loop circulation has a continuous supply of natural water to effectively cool the power source, the external environment has a great influence on the stability of the internal pipeline. For example, when passing through a turbid area, impurities in the water are easily sucked into the cooling flow channel along with the water flow, resulting in fouling and blockage of the flow channel, and ineffective cooling. In the sea, seawater has certain corrosiveness, which may corrode and damage the flow channel, making it difficult to maintain the subsequent machine and greatly shortening the service life of the machine.

[0004] There is also a closed-loop circulation method that uses an external / built-in water tank to circulate water inside the marine propulsion equipment to cool the power source. Although this method requires a simple structure and low cost, the cooling water tank has a poor cooling effect on the power source during long-term and high-power operation. And usually, to improve the heat dissipation efficiency of the engine / electric motor, it is necessary to increase the volume of the water tank. For an external water tank, a large amount of space inside the ship needs to be sacrificed, while the built-in water tank type closed-loop cooling may cause the head of the propulsion equipment to become larger and the overall weight to increase, which is not conducive to its disassembly, assembly and portability.

[0005] There is an urgent need for a cooling system and marine propulsion equipment with high reliability and good cooling efficiency to solve the above problems. Summary of the Invention

[0006] In a first aspect, the present invention provides a cooling system for realizing heat dissipation and cooling of a marine propulsion device. The cooling system includes a first cooling circuit, a heat exchanger, and a second cooling circuit. The first cooling circuit is heat-transfer connected to a heat-generating component of the marine propulsion device, and the second cooling circuit is heat-transfer connected to the first cooling circuit through the heat exchanger, so as to realize the cooling and heat dissipation of the marine propulsion device through the heat transfer among the heat-generating component, the first cooling circuit, the heat exchanger, and the second cooling circuit.

[0007] Optionally, a pump and a fluid supply source are arranged on the first cooling circuit. The heat exchanger, the pump, and the fluid supply source are connected in series through a connection channel to form a closed flow path, and the pump drives a cooling medium to flow in the closed flow path to constitute the first cooling circuit.

[0008] Optionally, a heat exchange driving device and a receiving cavity are arranged on the second cooling circuit. The heat exchanger, the heat exchange driving device, and the receiving cavity are connected in series to form an open flow path. The heat exchanger is arranged in the receiving cavity. The cooling system further includes a first cooling hole and a second cooling hole communicated with the receiving cavity. The receiving cavity is arranged in external cooling water, and the heat exchange driving device drives the external cooling water to flow in and out between the outside and the receiving cavity through the first cooling hole and the second cooling hole to exchange heat with the heat exchanger to constitute the second cooling circuit.

[0009] Optionally, the heat exchange driving device is a propeller of the marine propulsion device. One end of the first cooling hole and the second cooling hole is communicated with the receiving cavity, and the other ends respectively extend to the negative pressure areas on the front and rear sides of the propeller, and the suction action of the propeller is used to drive the external cooling water to flow in and out of the first cooling hole and the second cooling hole.

[0010] Optionally, the receiving cavity is integrally formed on the underwater housing of the marine propulsion device, and the outer contour of the heat exchanger matches the receiving cavity.

[0011] Optionally, the number of the first cooling holes is an even number, and the even number of the first cooling holes are symmetrically distributed on both sides of the underwater housing.

[0012] Optionally, the heat exchanger includes a heat exchange pipe and an upper cover plate. The heat exchange pipe penetrates through the upper cover plate and is fixedly and sealingly connected to the upper cover plate. The heat exchange pipe is a structure of one or more bent thin-walled pipes.

[0013] Optionally, two or more pairs of limit blocks arranged on opposite sides are provided between the heat exchanger and the receiving cavity. The limit blocks are provided with slot holes with one side open, and the heat exchange pipes are clamped in the slot holes of the limit blocks.

[0014] Optionally, the upper cover plate is hermetically abutted against the opening end face of the accommodating cavity, and the support frame of the marine propulsion device presses and fixes the upper cover plate on the underwater housing.

[0015] Optionally, the cooling system includes a control module, and further includes at least one of a temperature sensor, a pressure sensor, and a flow meter. The control module acquires the detection information of any one or more of the temperature sensor, the pressure sensor, and the flow meter and adjusts the rotation speed of the pump according to the information.

[0016] In a second aspect, the present invention provides a marine propulsion device, including any one of the above marine propulsion device cooling systems, and the heat generating components include one or more of an engine, an electric motor, a battery, and a motor driver.

[0017] The beneficial effects of the embodiments of the present invention are as follows:

[0018] The first cooling circuit uses a closed circulation cooling of the cooling medium, with high reliability, no wear on the flow channel and the heat generating components, and improved stability of the internal pipeline. The second cooling circuit further exchanges heat with the external cooling water through a heat exchanger, improving the cooling efficiency, reducing the volume of the fluid supply source, and making the entire system and device more reliable and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural block diagram showing the cooling system of the marine propulsion device according to the embodiment of the present invention;

[0020] Figure 2 A perspective view of an angle of the underwater part of the marine propulsion device according to the embodiment of the present invention

[0021] Figure 3 A structural diagram showing the heat exchanger according to the embodiment of the present invention;

[0022] Figure 4 A perspective view of another angle of the underwater part of the marine propulsion device according to the embodiment of the present invention;

[0023] Figure 5 Showing Figure 4 A cross-sectional view of the underwater part of the marine propulsion device shown along line A-A;

[0024] Figure 6 An exploded view of the underwater part (excluding the propeller) of the marine propulsion device according to the embodiment of the present invention;

[0025] Figure 7 Showing the marine propulsion device according to the embodiment of the present invention;

[0026] Figure 8 Showing another marine propulsion device according to the embodiment of the present invention;

[0027] Wherein:

[0028] 1. Heat exchanger; 111. Upper cover plate; 112. Heat exchange pipes; 113. Inlet pipe; 114. Outlet pipe;

[0029] 12. Accommodating cavity; 121. Step portion; 13. Sealing ring; 14. Hose clamp; 15. Limiting block;

[0030] 2. Heating component; 21. Driver; 22. Motor;

[0031] 3. Pump; 4. Fluid supply source;

[0032] 5. Underwater part of marine propulsion equipment; 51. Underwater housing; 52. Propeller; 53. First cooling hole; 54. Second cooling hole;

[0033] 6. Support frame. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0035] It should be noted that the various optional implementation manners introduced in the embodiments of the present invention can be combined with each other or implemented separately, and the embodiments of the present invention do not make any limitations in this regard.

[0036] Marine propulsion equipment usually consists of parts such as a power source, a controller, a propeller, a support rod, a gearbox, a battery, etc. The power source and the controller are the core components of the marine propulsion device. When they operate at high speed, a large amount of heat will be generated. At this time, if the heat cannot be discharged in time, it will cause the power source or the driver to overheat, which may further lead to the stoppage or even damage of the marine propulsion device.

[0037] Next, the technical solutions of the present invention will be further described in conjunction with the accompanying drawings and through specific implementation manners.

[0038] This embodiment provides a cooling system for marine propulsion equipment, which can cool the heating components in the marine propulsion equipment and achieve the heat dissipation and cooling of the marine propulsion equipment.

[0039] Such as Figure 1As shown, the cooling system of the marine propulsion equipment includes a first cooling circuit, a second cooling circuit and a heat exchanger 1. The first cooling circuit is heat-transfer connected to the heat-generating component 2 of the marine propulsion equipment, and the second cooling circuit is heat-transfer connected to the first cooling circuit through the heat exchanger 1, so as to realize the cooling and heat dissipation of the marine propulsion equipment through the heat transfer among the heat-generating component 2, the first cooling circuit, the heat exchanger 1 and the second cooling circuit.

[0040] A pump 3 and a fluid supply source 4 are arranged on the first cooling circuit. Among them, the pump 3, the fluid supply source 4 and the heat exchanger 1 are connected in series through the connection channel to form a closed channel. The pump 3 drives the cooling medium to flow in the closed flow channel to form the first cooling circuit, and the heat-generating component 2 is heat-transfer connected to the first cooling circuit to dissipate heat and cool the heat-generating component 2. Optionally, cooling channels are arranged inside the heat-generating component 2, and these cooling channels are connected in series to the closed flow channel through the connection channel. In this embodiment, the connection channel is a pipeline. In other embodiments, the connection between each component is not limited to being connected in series by a pipeline.

[0041] The heat-generating component 2 is usually a power source and a controller. In this embodiment, the heat-generating component 2 is a motor 22 and a driver 21. Depending on different marine propulsion equipment or marine propulsion equipment in different application scenarios, there are different heat-generating components 2, which are not limited to the above-mentioned motor 22 and driver 21. For example, it can be any one or more of a motor, an engine, a driver, a circuit board, a battery, an oil seal, a transmission shaft or other electronic devices.

[0042] The fluid supply source 4 provides a cooling medium for the cooling system of the marine propulsion equipment. The cooling medium can be a liquid, a liquid mixture or a gas, such as oil, water, a mixture of ethylene glycol and pure water, etc. As a preferred embodiment, the fluid supply source 4 selects a mixture of 50% ethylene glycol and 50% pure water, which has a good cooling effect and can play an anti-freezing role when the marine propulsion equipment passes through a low-temperature environment. The fluid supply source 4 is in the form of a box, and other fluid storage containers can also be selected.

[0043] The first cooling circuit transports the cooling medium through the pump 3. The pump 3 can be driven by a power source or have its own drive. When the pump has its own drive mechanism, it starts working after being powered. In this embodiment, the pump is a centrifugal pump with its own drive, and the centrifugal pump has PWM speed regulation. Inside the marine propulsion device, there are a control module, a temperature sensor, a pressure sensor, and a flowmeter. The temperature sensor, pressure sensor, and flowmeter are used to detect the temperature, pressure, and flow information in the system. The control module controls the centrifugal pump drive to change the speed according to the detected temperature, pressure, and flow information, and adjusts the heat dissipation power to achieve a heat dissipation effect that meets the requirements under different working conditions. In other embodiments, the pump 4 is not limited to a centrifugal pump. As a preferred embodiment, the fluid supply source 4 is arranged directly above the pump 3, which can prevent cavitation.

[0044] The cooling medium provided by the fluid supply source 4 is driven by the pump 3 to circulate in a closed flow path to form the first cooling circuit. The first cooling circuit is a closed-loop cooling circuit. The cooling medium flows through the heating component 2, absorbs the heat in the heating component 2, and after passing through the heat exchanger 1, exchanges heat with the outside world to reduce the temperature of the cooling medium in the first cooling circuit, thereby achieving the cooling of the heating component 2. It should be noted that there are various heating components 2, and the order in which the cooling medium flows through each heating component 2 can be freely adjusted. In this embodiment, since the cooling temperature required by the driver 21 is lower than that of the motor 22, the basic circulation path of the first cooling circuit is: heat exchanger 1 - driver 21 - motor 22 - heat exchanger 1, and the fluid supply source 4 and the pump 3 can be added at any intermediate position.

[0045] In this embodiment, a heat exchange driving device and a receiving cavity 12 are provided on the second cooling circuit. The receiving cavity 12, the heat exchanger 1, and the heat exchange driving device are connected in series to form an open flow path. The heat exchanger 1 is placed in the receiving cavity 12. The receiving cavity 12 is arranged in the external cooling water. A first cooling hole 53 and a second cooling hole 54 are communicated with the receiving cavity 12. The heat exchange driving device drives the external cooling water to flow in from the first cooling hole 53 or the second cooling hole 54, wash the heat exchanger 1 in the receiving cavity 12, and after heat exchange of the cooling medium in the first cooling circuit, flow out from the second cooling hole 53 or the first cooling hole 54. It should be noted that the receiving cavity 12 can be arranged in the underwater part 5 of the marine propulsion device, or a separate module can be provided and connected to the marine propulsion device.

[0046] As Figure 2As shown, the heat exchange driving device is a propeller 52. When the propeller 52 rotates, the propeller pushes water backward (or forward) and is subject to the reaction force of the water to provide a forward (or backward) thrust for the marine propulsion device. At the same time, a relative negative pressure will be generated on the front and back sides of the propeller 52. In other embodiments, the heat exchange driving device may also be a second water pump, which is arranged in the second cooling circuit and drives an external fluid such as external cooling water to flow through the heat exchanger to achieve heat exchange. By using the suction effect of the propeller 52 to drive the external cooling water to wash the heat exchanger 1, a set of power-driven water pump and pipeline can be omitted, reducing the volume of the fluid supply source. At the same time, the overall size of the marine propeller is made more compact, the weight is reduced, and it is convenient for transportation and carrying, thus further improving the user experience.

[0047] The underwater part 5 of the marine propulsion device includes an underwater housing 51, a propeller 52, a wave-breaking plate, a transmission shaft (not shown), and fins, etc. In this embodiment, the heat exchanger 1 is arranged in the accommodation cavity 12, and the accommodation cavity 12 is arranged in the underwater housing 51 of the underwater part 5 of the marine propulsion device. One end of the first cooling hole 53 and the second cooling hole 54 is connected to the accommodation cavity 12, and the other end extends to the negative pressure areas on the front and back sides of the propeller 52 respectively. Due to the pressure difference, the propeller 52 drives the external cooling water to flow in and out between the outside and the accommodation cavity 12 through the first cooling hole 53 and the second cooling hole 54, and exchanges heat with the heat exchanger 1 to form a second cooling circuit.

[0048] The first cooling hole 53 is arranged on the underwater housing 51. As a preferred embodiment, the number of the first cooling holes 53 is an even number, and the even number of the first cooling holes 53 are symmetrically distributed on both sides of the underwater housing 51 to make the pipeline flow passage smooth and reduce the flow passage resistance.

[0049] The second cooling hole 54 is arranged in the hub of the propeller 52, and a plurality of second cooling holes 54 extend along the axial direction of the propeller 52 and are evenly distributed along the circumferential direction of the propeller 52. In other embodiments, the way of heat exchange is not limited to opening holes to communicate with the external cooling water. For example, part of the cooling circuit can be immersed in water, or a fan can be arranged around the connection channel to cool the cooling medium in the connection channel by air cooling.

[0050] Due to the suction effect of the propeller 52 on the water flow, the water flow at the propeller disc is accelerated. According to Bernoulli's law, on the same streamline, when the velocity of water quality points increases, the pressure will inevitably decrease. When the propeller 52 rotates forward, the flow velocity at the cross-section of the end of the propeller hub far from the propeller shaft is relatively high and the pressure is relatively low, while the flow velocity at the underwater housing 51 is relatively low and the pressure is relatively high. The existence of the pressure difference causes external fluid such as external cooling water to flow from the high-pressure area to the low-pressure area, that is, the external cooling water continuously enters the accommodation cavity 12 through the first cooling hole 53 on the underwater housing 51 and is discharged from the second cooling hole 54, forming a second cooling circuit. After the second cooling circuit exchanges heat with the heat exchanger 1 sufficiently in the accommodation cavity 12, the heat is dissipated to the external environment, thereby reducing the temperature of the cooling medium inside the heat exchanger 1 and realizing the cooling of the cooling medium in the first cooling circuit.

[0051] When the propeller 52 rotates in reverse, on the contrary, the pressure at the cross-section of the end of the propeller hub far from the propeller shaft is relatively high, while the underwater housing 51 is a negative pressure area generated by the suction effect. The external cooling fluid continuously enters the accommodation cavity 12 from the second cooling hole 54, exchanges heat with the heat exchanger 1, and is discharged from the first cooling hole 53. It should be noted that when the propeller is in reverse thrust, the pressure difference in the suction negative pressure area can be increased by blade design and adjustable pitch propeller.

[0052] In this embodiment, since the water depth height difference is not large and the pressure difference mainly comes from the rotation of the propeller 52, the suction pressure difference angle and the optimal position are not obvious. The first cooling hole 53 can be opened at any position on the underwater housing 51. Preferably, the first cooling hole 53 and the second cooling hole 54 are arranged at the same height in the horizontal direction.

[0053] The heat exchanger 1 includes a heat exchange pipe 112 and an upper cover plate 111. The heat exchange pipe 112 passes through the upper cover plate 111 and is fixedly and sealedly connected to the upper cover plate 111. The cooling medium flows through the inner side of the heat exchange pipe 112, and the external cooling water flows through the outer side of the heat exchange pipe 112. The first cooling circuit and the second cooling circuit are heat transfer connected through the heat exchange pipe 112. As Figure 3 shown, the heat exchange pipe 112 is of a tubular structure and can also be replaced with common heat exchanger types such as a plate heat exchanger or a plate heat exchanger. In other embodiments, multiple heat exchangers 1 can also be arranged in series to improve the heat exchange efficiency. The heat exchanger 1 further includes an inlet pipe 113 and an outlet pipe 114. The heat exchange pipe 112 is connected to the inlet pipe 113 and the outlet pipe 114 through through holes in the upper cover plate 111. As Figure 6 shown, the inlet pipe 113 and the outlet pipe 114 are connected to the pipes passing through the cavity of the marine propulsion equipment support frame 6 through hose clamps 14.

[0054] The heat exchange pipe 112 is of a bent pipe structure with one or more pipes. In other embodiments, a straight pipe structure may also be adopted, and the bent pipes are arranged in a staggered and parallel manner. As a preferred embodiment, the heat exchange pipe 112 adopts a thin-walled pipe structure, and the bending radius of the heat exchange pipe 112 is designed according to the maximum size that the accommodation cavity 12 can accommodate, which maximally increases the heat exchange area, improves the heat exchange efficiency, reduces the thermal resistance, and will not cause excessive internal impedance to affect the flow rate of the heat exchanger 1.

[0055] As Figure 4 , Figure 5 shown, the accommodation cavity 12 is arranged inside the underwater housing 51, and the underwater housing 51 is usually a gearbox housing, and may also be a motor housing. When the underwater housing 51 is a gearbox housing, the accommodation cavity 12 is arranged separately from the gear transmission part in the gearbox to prevent impurities in the external cooling water from affecting its transmission.

[0056] The accommodation cavity 12 has an integrally formed inner contour, and the inner contour matches the outer contour of the heat exchanger 1. A step portion 121 is arranged in the direction away from the propeller 52 of the accommodation cavity 12, and the step portion 121 is at the same height as the upper cover plate 111.

[0057] As Figure 6 shown, during assembly, the heat exchanger 1 is placed vertically into the accommodation cavity 12, and the upper cover plate 111 can abut against the step portion 121 to limit the movement of the heat exchanger 1 in the vertical direction. Two or more pairs of limit blocks 15 arranged on opposite sides are provided between the heat exchanger 1 and the accommodation cavity 12. The limit blocks 15 are made of rubber material, and a slot hole with the same aperture as the heat exchange pipe 112 is opened on one side. The inclination angle of the limit block 15 is designed according to the shape of the heat exchange pipe 112, and the heat exchange pipe 112 is clamped in the slot hole of the limit block 15. The limit blocks 15 can prevent the heat exchanger 1 from shaking in the accommodation cavity 12, and at the same time can play a role in damping the heat exchange pipe 112, reducing noise, preventing friction between the walls of the heat exchange pipe 112, and preventing friction between the wall of the heat exchange pipe 112 and the inner wall of the accommodation cavity 12, thereby improving the stability of the cooling system of the marine propulsion equipment.

[0058] The support frame 6 is connected to the underwater housing 51 by bolts, so as to apply a downward pressing force to the heat exchanger 1. Combining the limitation of the heat exchanger 1 by the limit blocks 15 and the upper cover plate 111, the heat exchanger 1 can be fixed in the underwater housing 51, making its installation and disassembly convenient and having high maintainability.

[0059] To enable the negative pressure of the propeller 52 to better drive the external cooling water to flow in a predetermined direction, a sealing ring 13 having the same contour as the upper cover plate 111 is sleeved on the upper cover plate 111. The upper part of the cavity where the heat exchanger 1 is located is sealed through the sealing ring 13, so that the upper cover plate 111 is sealed with the opening section of the accommodating cavity 12, which can ensure that the negative pressure generated by the propeller 52 can more effectively drive the flow of the external cooling water in the accommodating cavity 12.

[0060] As a preferred embodiment, filters are provided at the first cooling hole 53 and the second cooling hole 54, which can avoid problems such as the heat exchanger 1 being easily worn due to poor water quality, sediment and debris, and the second cooling circuit being easily blocked.

[0061] The present invention also provides a marine propulsion device, including a marine propulsion device body and a marine propulsion device cooling system. The structure, working principle and beneficial effects of the marine propulsion device cooling system are the same as those of the first embodiment, and will not be elaborated here; as Figure 7 , Figure 8 shown, the marine propulsion device can place the motor and the driver on the upper part, transmit torque through the transmission shaft and gear transmission to drive the propeller to rotate, or place the motor in the underwater part of the marine propulsion device and directly drive the propeller to rotate by the motor.

[0062] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, it cannot be understood as a limitation to the present invention. In addition, "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0064] The above embodiments are described with reference to the accompanying drawings. Other different forms and embodiments are also feasible without departing from the principles of the present invention. Therefore, the present invention should not be construed as being limited to the embodiments presented herein. Rather, these embodiments are provided so that the present invention will be complete and entire, and will convey the scope of the present invention to those skilled in the art. In the drawings, component sizes and relative sizes may be exaggerated for clarity. The terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting. The terms "comprising" and / or "including" when used in this specification denote the presence of the stated features, integers, components, and / or assemblies, but do not preclude the presence or addition of one or more other features, integers, components, assemblies, and / or groups thereof. Unless otherwise indicated, when stating a value range, the range includes the upper and lower limits thereof and any sub-ranges therebetween.

[0065] The foregoing are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications are also within the scope of protection of the present invention.

Claims

1. A cooling system for a marine propulsion device, which is used to achieve heat dissipation and cooling of the marine propulsion device. Characterized in that, The cooling system includes a first cooling circuit, a heat exchanger and a second cooling circuit; the first cooling circuit is heat transfer connected to the heat generating component of the marine propulsion device, and the second cooling circuit is heat transfer connected to the first cooling circuit through the heat exchanger, so as to realize the cooling and heat dissipation of the marine propulsion device through the heat transfer between the heat generating component, the first cooling circuit, the heat exchanger and the second cooling circuit; A heat exchange driving device and a receiving cavity are arranged on the second cooling circuit; the heat exchanger is connected in series with the heat exchange driving device and the receiving cavity to form an open flow channel; the heat exchanger is arranged in the receiving cavity, and the cooling system further includes a first cooling hole and a second cooling hole communicated with the receiving cavity, the receiving cavity is arranged in the external cooling water, and the heat exchange driving device drives the external cooling water to flow in and out between the outside and the receiving cavity through the first cooling hole and the second cooling hole to exchange heat with the heat exchanger to form the second cooling circuit; The heat exchange driving device is the propeller of the marine propulsion device, one ends of the first cooling hole and the second cooling hole are communicated with the receiving cavity, and the other ends respectively extend to the negative pressure areas on the front and rear sides of the propeller, and the suction action of the propeller is used to drive the external cooling water to flow in and out of the first cooling hole and the second cooling hole; the first cooling hole is arranged on the underwater housing, and the second cooling hole is arranged in the propeller hub; The receiving cavity is integrally formed on the underwater housing of the marine propulsion device, and the outer contour of the heat exchanger matches the receiving cavity.

2. The cooling system according to claim 1, Characterized in that, A pump and a fluid supply source are arranged on the first cooling circuit; the heat exchanger is connected in series with the pump and the fluid supply source through a connection channel to form a closed flow channel, and the pump drives the cooling medium to flow in the closed flow channel to form the first cooling circuit.

3. The cooling system according to claim 2, Characterized in that, The number of the first cooling holes is even, and the even number of the first cooling holes are symmetrically distributed on both sides of the underwater housing.

4. The cooling system according to claim 3, Characterized in that, The heat exchanger includes a heat exchange pipe and an upper cover plate, the heat exchange pipe penetrates through the upper cover plate and is fixedly and sealedly connected with the upper cover plate, and the heat exchange pipe is a structure of one or more bent thin-walled pipes.

5. The cooling system according to claim 4, Characterized in that, Two or more pairs of limit blocks arranged on opposite sides are arranged between the heat exchanger and the receiving cavity, and the limit blocks are provided with slot holes with one side open, and the heat exchange pipes are clamped in the slot holes of the limit blocks.

6. The cooling system according to claim 4, Characterized in that, The upper cover plate is hermetically abutted against the opening end face of the receiving cavity, and the support frame of the marine propulsion device presses and fixes the upper cover plate on the underwater housing.

7. The cooling system according to any one of claims 2-6, Characterized in that, The cooling system includes a control module, and further includes at least one of a temperature sensor, a pressure sensor, and a flow meter. The control module acquires detection information of any one or more of the temperature sensor, the pressure sensor, and the flow meter, and adjusts the rotational speed of the pump according to the information.

8. A marine propulsion device, characterized in that it includes the cooling system according to any one of claims 1-7, and the heating component includes one or more of an engine, an electric motor, a battery, and a motor driver.

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