Controller cooling device for brushless submersible pump-based outboard motor

Abstract

This invention discloses a cooling device for an electric outboard motor controller based on a brushless submersible pump. The controller is housed within the surface casing of the electric outboard motor. The device comprises an underwater casing and an internal square filter screen, as well as a brushless submersible pump. The upper and lower ends of the underwater casing are connected to the surface casing and motor casing of the electric outboard motor, respectively. First water inlets are located at the left and right ends of the underwater casing. The square filter screen has mesh openings on its left, right, and lower surfaces, with the left and right surfaces connected to the first water inlets at the left and right ends of the underwater casing. The brushless submersible pump is positioned below the lower surface of the square filter screen and is connected to the controller via a cooling pipe. This invention utilizes a brushless submersible pump, which offers advantages such as small size, long lifespan, and stable pumping capacity. The design of two water inlets ensures sufficient water intake, and the pump inlet is positioned on the water-facing side with a water trough designed to ensure a relatively gentle water flow into the pump.

Description

Technical Field

[0001] This invention relates to the field of electric outboard motors, and particularly to a cooling device for an electric outboard motor controller based on a brushless submersible pump. Background Technology

[0002] In an electric outboard motor, the motor controller can be placed in an underwater hull and cooled by external water, or placed in an above-water hull and cooled by a small fan or by a water pump that circulates water through the controller's heat sink.

[0003] As market demand increases, the power of electric outboard motors is also increasing, leading to larger motor sizes. This necessitates placing the controller on the surface of the water. Water cooling technology can be divided into internal and external circulation. Internal circulation requires a large volume to store coolant, making the outboard motor bulky and aesthetically unappealing. The challenges of using external circulation water-cooled motor controllers include:

[0004] (1) The aquatic environment is very poor, with silt, algae, leaves, etc., which can easily cause the water pump to become clogged, leading to the failure of the cooling system. Therefore, we need to solve the problem of water pump clogging leading to cooling system failure;

[0005] (2) The working conditions of a brushless submersible pump are that the pump must be completely submerged in water to work, and the water flow needs to be relatively gentle and the water quality requirements are also very high. However, during the high-speed operation of the outboard motor, the propeller rotates at high speed, and the water flow is directly drawn away by the propeller. A vacuum state will be generated near the water pump inlet, and the water flow cannot enter the water pump. Therefore, we also need to solve the problem of insufficient water volume in the submersible pump. Summary of the Invention

[0006] The purpose of this invention is to provide a cooling device for an electric outboard motor controller based on a brushless submersible pump, which solves the problem of insufficient water volume in the submersible pump and ensures that the brushless submersible pump can obtain clean and stable cooling water to cool the controller of the electric outboard motor using external circulating water.

[0007] The technical solution of this invention is:

[0008] A cooling device for an electric outboard motor controller based on a brushless submersible pump is provided. The controller is placed in the surface housing of the electric outboard motor and includes an underwater housing and a square filter screen and a brushless submersible pump inside. The upper and lower ends of the underwater housing are respectively connected to the surface housing and the motor housing of the electric outboard motor. The left and right ends of the underwater housing are respectively provided with first water inlets. The left, right and lower ends of the square filter screen are respectively provided with mesh holes, wherein the left and right ends are respectively connected to the first water inlets at the left and right ends of the underwater housing. The brushless submersible pump is placed below the lower end of the square filter screen and is connected to the controller through a cooling pipe.

[0009] Preferably, a second water inlet is provided on the lower side wall of the water machine casing. The second water inlet is located above the square filter screen, and the upper surface of the square filter screen is also provided with mesh holes.

[0010] Preferably, the water flowing in from the first inlet enters the center of the square filter screen through the left and right end faces of the screen, and the water flowing in from the second inlet enters the center of the screen from the top end face of the screen. The water flowing from the center of the screen flows from the bottom end face of the screen to the inlet of the brushless submersible pump.

[0011] Preferably, the lower end face of the square filter screen is at least 2mm higher than the inlet of the brushless submersible pump.

[0012] Preferably, the front end face of the square filter screen is arc-shaped and fits into the conduit inside the housing; the rear end face of the square filter screen is also provided with mesh holes, and the water flow in the center of the filter screen flows out from both the lower end face and the rear end face at the same time.

[0013] Preferably, the second water inlet includes multiple mesh holes with a side length not exceeding 2mm, the mesh holes on the left and right end faces of the square filter screen have a side length not exceeding 3mm, and the mesh holes on the top, bottom, and rear end faces of the square filter screen are round holes with a diameter not exceeding 0.85mm.

[0014] Preferably, the square filter screen is fixedly installed to the conduit inside the housing by screws.

[0015] The advantages of this invention are:

[0016] 1. This invention uses a brushless submersible pump. The advantages of a brushless submersible pump are its small size, long life, and stable pumping volume. By designing two inlets, the water intake volume is guaranteed. The pump inlet is placed on the water-facing side and a water tank is designed to ensure that the water flow can enter the pump relatively smoothly.

[0017] 2. This invention designs two filtration channels. The channels pass through a filter capable of filtering large impurities before entering the center of the filter screen. The filter screen is designed with a pore size of 0.85mm to ensure that the water pump requires a filter screen mesh size ≤20 mesh, resulting in very clean filtered water.

[0018] 3. The filter screen of the present invention is fixed to the conduit connector with screws, which facilitates the cleaning and replacement of the filter screen.

[0019] In summary, these three points ensure that the brushless submersible pump can obtain clean and stable cooling water from the external circulating water system to cool the controller of the electric outboard motor. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 An exterior view of the cooling unit for an electric outboard motor controller based on a brushless submersible pump;

[0022] Figure 2 This is a cross-sectional view of the cooling unit for an electric outboard motor controller based on a brushless submersible pump.

[0023] Figure 3 This is a schematic diagram of the internal cooling device of an electric outboard motor controller based on a brushless submersible pump.

[0024] Figure 4 This is a schematic diagram of a square filter screen. Implementation

[0025] like Figure 1-4 As shown, the cooling device for the electric outboard motor controller based on a brushless submersible pump of the present invention includes an underwater housing 1 and a square filter screen 2 and a brushless submersible pump 3 inside it. The upper and lower ends of the underwater housing are respectively connected to the surface housing 4 and the motor housing 5 of the electric outboard motor. The left and right ends of the underwater housing 1 are respectively provided with first water inlets 11. The left, right, upper, lower and rear ends of the square filter screen 2 are respectively provided with mesh holes, wherein the left and right ends are respectively connected to the first water inlets 11 at the left and right ends of the underwater housing 1. The front end of the square filter screen 2 is set in an arc shape and fits with the conduit 6 inside the housing. The lower side wall of the surface housing 4 is provided with a second water inlet 41, which is located above the square filter screen 2. The brushless submersible pump 3 is placed below the lower end face of the square filter screen 2 and is connected to the controller through a cooling pipe. The controller is placed in the surface housing of the electric outboard motor.

[0026] There are two paths for water to flow through the square filter screen 2: water entering from the first inlet 11 enters the center of the filter screen through the left and right end faces of the square filter screen 2, and water entering from the second inlet 41 enters the center of the filter screen from the upper end face of the square filter screen 2; water in the center of the filter screen flows from the lower and rear end faces of the square filter screen to the inlet of the brushless submersible pump 3.

[0027] The lower end of the square filter screen 2 is at least 2mm higher than the inlet of the brushless submersible pump 3. The working principle of the brushless submersible pump 3 is to pump water by agitating the water flow with very small centrifugal blades. Therefore, the inlet of the brushless submersible pump 3 needs to be completely submerged in water, and the water flow should not be too turbulent to affect the rotation of the blades. The design of the lower end of the square filter screen 2 being at least 2mm higher than the water pump inlet can form a water tank. Furthermore, the inlet of the brushless submersible pump 3 faces the water-facing side. After the water flows in, the water flow speed will be relatively gentle and directly enter the water pump inlet, ensuring the working operation requirements of the water pump.

[0028] The second water inlet 41 on the water-based housing 4 includes six mesh holes with a side length of 2mm. The mesh holes on the left and right ends of the square filter screen 2 have a side length of 3mm, which can initially filter larger impurities. The mesh holes on the top, bottom, and rear ends of the square filter screen 2 are round holes with a diameter of 0.85mm and a distribution density of 20 meshes. This ensures that the water flowing into the brushless submersible pump 3 is relatively clean, guaranteeing the service life of the pump. At the same time, the square filter screen 2 is installed by screws fixed to the connector of the conduit 6, making it easy to clean and replace the filter screen.

[0029] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All modifications made according to the spirit and essence of the main technical solution of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A cooling device for a controller of an electric outboard motor based on a brushless submersible pump, the controller being disposed in a water over casing of the electric outboard motor, characterized in that, The utility model discloses a square filter screen of underwater shell and its inside, brushless submersible pump, underwater shell upper and lower two ends respectively connect the water shell of electric outboard motor, motor casing, underwater shell left and right two ends are equipped with first water inlet respectively, square filter screen left, right, lower end surface is equipped with mesh respectively, wherein left, right end surface is connected with the first water inlet of underwater shell left and right two ends respectively, brushless submersible pump is placed below square filter screen lower end surface, is connected through cooling pipe controller, The lower end side wall of the water shell is provided with a second water inlet, and the second water inlet is located above the square filter screen, and the upper end surface of the square filter screen is also provided with a mesh. The water flow entering from the first water inlet enters the filter screen center through the left and right end surfaces of the square filter screen, and the water flow entering from the second water inlet enters the filter screen center from the upper end surface of the square filter screen. The front end surface of the square filter screen is set to be arc-shaped and is fitted with the wire pipe in the shell. The lower end surface of the square filter screen is higher than the water inlet of the brushless submersible pump by more than 2 mm.

2. The brushless submersible pump-based controller cooling apparatus for an electric outboard motor according to claim 1, characterized by, The second water inlet includes a plurality of meshes with a side length of not more than 2 mm, the meshes on the left and right end surfaces of the square filter screen have a side length of not more than 3 mm, and the meshes on the upper, lower, and rear end surfaces of the square filter screen are circular holes with a hole diameter of not more than 0.85 mm.

3. The brushless submersible pump-based controller cooling apparatus for an electric outboard motor according to claim 1, characterized by The square filter screen is fixedly installed in the wire pipe in the shell through screws.

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