Internal circulation cooling structure of electric outboard engine

Abstract

The internal circulation cooling structure of the electric outboard engine comprises a cooling plate, a water cooling box, a cooling water pipe and a circulating pump, the cooling plate and the water cooling box are hung on an overwater support of the outboard engine, and the cooling water pipe and the circulating pump are installed in an underwater shell of the outboard engine; cooling liquid is stored in the water cooling box, a water outlet of the water cooling box is communicated with the water inlet end of the cooling water pipe, the water outlet end of the cooling water pipe is communicated with the water inlet end of the circulating pump, the water outlet end of the circulating pump is communicated with the water inlet end of the cooling plate, the water outlet end of the cooling plate is communicated with a water return port of the water cooling box, and a motor controller of the outboard engine is attached to the cooling plate. An internal circulation cooling mode is adopted, so that the blocking risk of a cooling loop can be effectively reduced, and the reliability of the cooling structure is improved; the cooling water pipe and the circulating pump are arranged in the underwater shell of the outboard engine, the occupied space of the overwater part can be saved, the cooling liquid can be fully cooled through external water flow, and the cooling effect is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of outboard motors, specifically to an internal circulation cooling structure for an electric outboard motor. Background Technology

[0002] The motor is the main power source of the electric outboard motor. The controller of the motor (especially the high-power motor) generates a lot of heat during operation, so it needs to be cooled to ensure its normal operation. Currently, common controller cooling structures are to place the motor controller in an underwater hull and let it be cooled by external water, or to place the motor controller in an above-water hull and cool it by fan cooling or water circulation pipe cooling.

[0003] As market demand for higher power outputs increases, the size of electric outboard motors also grows. This necessitates placing the motor controller within the submerged hull and relying on air or water cooling for heat dissipation. Common water cooling structures can be categorized into internal and external circulation cooling systems. Internal circulation cooling requires a large storage chamber to hold the coolant, taking up considerable space. Furthermore, the cooling process itself needs careful consideration, resulting in a bulky and aesthetically unappealing outboard motor. One challenge with external circulation cooling is that electric outboard motors frequently operate in seawater environments. Seawater evaporates and crystallizes easily. If the motor controller's cooling plate is poorly designed, water accumulation can easily occur, and the accumulated crystals can clog the cooling plate's channels over time. Utility Model Content

[0004] In view of this, an embodiment of the present invention provides an internal circulation cooling structure for an electric outboard motor to cool and dissipate heat from the motor controller.

[0005] This utility model provides an internal circulation cooling structure for an electric outboard motor, comprising a cooling plate, a water-cooled tank, cooling water pipes, and a circulation pump. The cooling plate and the water-cooled tank are mounted on the outboard motor's surface support, while the cooling water pipes and the circulation pump are installed inside the outboard motor's underwater hull. The water-cooled tank stores coolant. The outlet of the water-cooled tank is connected to the inlet of the cooling water pipe via an inlet pipe. The outlet of the cooling water pipe is connected to the inlet of the circulation pump. The outlet of the circulation pump is connected to the inlet of the cooling plate via an outlet pipe. The outlet of the cooling plate is connected to the return port of the water-cooled tank. The outboard motor's motor controller is attached to the cooling plate.

[0006] Optionally, the height of the water return port of the water-cooled box is higher than the height of its outlet.

[0007] Optionally, the top of the water-cooled box is provided with a one-way waterproof and breathable valve.

[0008] Optionally, the cooling water pipe is a spirally folded stainless steel pipe.

[0009] Optionally, the inlet end of the cooling water pipe is securely connected to the inlet pipe via a bulge, and the outlet end of the cooling water pipe is securely connected to the inlet end of the circulating pump via a welded water nozzle.

[0010] Optionally, the coolant may be an antifreeze windshield washer fluid.

[0011] The present invention has the following advantages: by placing the cooling water pipe and the circulation pump inside the underwater hull of the outboard motor, on the one hand, it can save the space occupied by the above-water part and reduce the volume of the above-water hull; on the other hand, it can also make full use of external water flow to cool the coolant, thus ensuring the cooling effect; and the internal circulation cooling method can effectively reduce the risk of blockage of the cooling circuit and improve the reliability of the cooling structure. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the water-cooled box in an embodiment of this utility model;

[0015] Figure 3 This is a schematic diagram of the cooling water pipe structure in an embodiment of this utility model;

[0016] Figure 4 This is a schematic diagram of the cooling cycle according to an embodiment of the present invention;

[0017] The numbers in the diagram represent:

[0018] 1. Cooling plate; 2. Water-cooled tank; 21. Outlet; 22. Return port; 23. Filler port; 24. One-way waterproof vent valve; 3. Cooling water pipe; 31. Bulge; 32. Welded water nozzle; 4. Circulation pump; 5. Surface support; 6. Underwater shell; 7. Inlet pipe; 8. Outlet pipe. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 As shown, an embodiment of this utility model provides an internal circulation cooling structure for an electric outboard motor, including a cooling plate 1, a water-cooled tank 2, cooling water pipes 3, and a circulation pump 4. The cooling plate 1 and the water-cooled tank 2 are mounted on the water-mounted support 5 of the outboard motor (the water-cooled tank 2 is obscured by the cooling plate 1 in the figure), while the cooling water pipes 3 and the circulation pump 4 are installed inside the underwater hull 6 of the outboard motor. The water-cooled tank 2 stores coolant. The outlet 21 of the water-cooled tank 2 is connected to the inlet of the cooling water pipe 3 via an inlet pipe 7. The outlet of the cooling water pipe 3 is connected to the inlet of the circulation pump 4. The outlet of the circulation pump 4 is connected to the inlet of the cooling plate 1 via an outlet pipe 8. The outlet of the cooling plate 1 is connected to the return port 22 of the water-cooled tank 2. The motor controller of the outboard motor is attached to the cooling plate 1 and can exchange heat with the cooling plate 1 for cooling.

[0021] like Figure 4 As shown, the coolant in the water-cooled tank 2 flows into the cooling water pipe 3 through the inlet pipe 7 for heat dissipation and cooling (the cooling water pipe 3 is completely underwater and can exchange heat with the external water flow). After cooling, the coolant is pumped to the cooling plate 1 by the circulation pump 4, carrying away the heat from the motor controller before flowing back to the water-cooled tank 2, thus forming a cooling cycle. Experimental verification shows that the best coolant to choose is an antifreeze glass cleaner that can withstand temperatures as low as -40℃. This avoids the defects of using natural water, such as corrosion; using pure water, such as freezing at low temperatures; and using antifreeze, such as poor thermal conductivity.

[0022] Furthermore, such as Figure 2 As shown, the height of the return water inlet 22 of the water-cooled tank 2 is higher than the height of its outlet 21. This allows for effective venting of gas from the pipes when adding coolant to the water-cooled tank 2 (the top of the water-cooled tank 2 has a liquid inlet 23). Additionally, the top of the water-cooled tank 2 is equipped with a one-way waterproof vent valve 24, which effectively prevents deformation of the water-cooled tank 2 due to gas expansion or contraction during summer or winter use.

[0023] Furthermore, such as Figure 3As shown, the cooling water pipe 3 can be made of spirally folded stainless steel, which can effectively increase the heat dissipation area and stroke, and improve the cooling effect. At the same time, in order to prevent the cooling water pipe 3 from falling off after long-term use, the water inlet end of the cooling water pipe 3 can be securely connected to the water inlet pipe 7 through the bulge 31, and the water outlet end of the cooling water pipe 3 can be securely connected to the water inlet end of the circulating pump 4 through the welded water nozzle 32, so as to ensure that the connection of the cooling water pipe 3 is more reliable.

[0024] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this utility model. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An internal circulation cooling structure for an electric outboard motor, characterized in that: The system includes a cooling plate, a water-cooled tank, cooling water pipes, and a circulating pump. The cooling plate and the water-cooled tank are mounted on the surface support of the outboard motor, while the cooling water pipes and the circulating pump are installed inside the underwater hull of the outboard motor. The water-cooled tank stores coolant. The outlet of the water-cooled tank is connected to the inlet of the cooling water pipe via an inlet pipe. The outlet of the cooling water pipe is connected to the inlet of the circulating pump via an outlet pipe. The outlet of the circulating pump is connected to the inlet of the cooling plate via an outlet pipe. The outlet of the cooling plate is connected to the return port of the water-cooled tank. The motor controller of the outboard motor is attached to the cooling plate.

2. The internal circulation cooling structure for an electric outboard motor according to claim 1, characterized in that: The height of the water return port of the water-cooled box is higher than the height of its water outlet.

3. The internal circulation cooling structure for an electric outboard motor according to claim 2, characterized in that: The top of the water-cooled box is equipped with a one-way waterproof and breathable valve.

4. The internal circulation cooling structure for an electric outboard motor according to claim 1, characterized in that: The cooling water pipe is made of spirally folded stainless steel.

5. The internal circulation cooling structure for an electric outboard motor according to claim 4, characterized in that: The inlet end of the cooling water pipe is securely connected to the inlet pipe via a bulge, and the outlet end of the cooling water pipe is securely connected to the inlet end of the circulating pump via a welded water nozzle.

6. The internal circulation cooling structure for an electric outboard motor according to claim 1, characterized in that: The coolant selected is antifreeze windshield washer fluid.

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