A heat dissipation mechanism of a sweeping robot

Abstract

This invention discloses a heat dissipation mechanism for a robotic vacuum cleaner, comprising: a housing, a brushless motor, and a cooling fan. The outer periphery of the brushless motor housing is provided with a heat sink assembly. The brushless motor is mounted within the housing via the heat sink assembly, and the output shaft of the brushless motor extends outward from the housing. An air inlet is located on one side of the housing, and an air outlet is located on the other side. The cooling fan is mounted on the air inlet. The housing has openings at both ends, each with a cover plate sealing the opening. In this invention, the brushless motor is mounted within the housing via the heat sink assembly, increasing the heat dissipation area. The heat sinks create an airflow channel, allowing airflow to contact and exchange heat with the heat sinks, thus improving heat dissipation efficiency. The cooling fan can operate independently, continuously dissipating heat from the brushless motor even when it is not in use, preventing problems such as shortened motor lifespan and demagnetization caused by high temperatures.

Description

Technical Field

[0001] This utility model relates to the field of sweeping robot technology, and in particular to a heat dissipation mechanism for a sweeping robot. Background Technology

[0002] Most robotic vacuum cleaners currently come equipped with a vacuuming device that sucks dust from the floor into a dust bag. To improve suction efficiency, manufacturers are constantly working to increase the suction power of this device. Due to the compact internal structure of robotic vacuum cleaners, the vacuuming device often uses a brushless motor. While brushless motors are small and have high speeds, they generate a lot of heat during operation, which can easily lead to burnout. There are two cooling methods. The first is to install a fan on the brushless motor's shaft, using the airflow generated by the motor's rotation to cool it. However, because the brushless motor drives the vacuuming device at high speed, the added fan requires high strength and dynamic balance. Furthermore, when the brushless motor stops working, there is no... The first method generates airflow, and the compact internal structure of the robotic vacuum cleaner results in slow natural heat dissipation. The brushless motor remains at a high temperature for an extended period when the machine is stopped, affecting its lifespan. A second method, such as the cooling device for a DC brushless motor in a household robotic vacuum cleaner disclosed in Chinese Patent Application No. 202310255113.5, uses a cooling fan to cool the brushless motor and allows it to continue operating even when the motor is stopped, overcoming the shortcomings of the first method. However, this patented solution delivers airflow through a flexible hose, resulting in low airflow velocity and insufficient air volume. Therefore, a cooling mechanism for the robotic vacuum cleaner is needed. This can be achieved by adding a cooling fan to the side of the brushless motor to increase airflow volume, and by installing heat sinks around the brushless motor to increase the heat dissipation area and improve cooling efficiency. Utility Model Content

[0003] To address the aforementioned issues, this invention proposes a heat dissipation mechanism for a sweeping robot. By adding a cooling fan to the side of the brushless motor, the airflow is increased, and heat sinks can be installed around the brushless motor to increase the heat dissipation area and improve heat dissipation efficiency.

[0004] This utility model is achieved through the following technical solution: This utility model proposes a heat dissipation mechanism for a sweeping robot, including: a shell, a brushless motor, and a cooling fan. The outer periphery of the shell of the brushless motor is provided with a heat sink assembly. The brushless motor is installed in the inner cavity of the shell through the heat sink assembly. The output shaft of the brushless motor extends outward from the shell. An air inlet is provided on one side of the shell, and an air outlet is provided on the other side of the shell. The cooling fan is installed on the air inlet. The shell has openings at both ends, and each opening at both ends is provided with a cover plate, which seals the opening.

[0005] Further, the heat sink group comprises a first heat sink and a second heat sink, wherein the first heat sink and the second heat sink are respectively arranged at the upper part and the lower part of the brushless motor, one end of the first heat sink and one end of the second heat sink are in close contact with the inner wall of the cover plate on one side of the housing, a gap of 1 cm to 2 cm is left between the other end of the first heat sink and the other end of the second heat sink and the cover plate on the other side of the housing, and the housing is divided into a n-shaped air duct by the first heat sink and the second heat sink.

[0006] Further, the heat sink group further comprises a short heat sink, one side of the short heat sink is connected to the brushless motor, the other side of the short heat sink is connected to the inner wall of the housing, and a gap of 1 cm to 2 cm is left between both ends of the short heat sink and the cover plate.

[0007] Further, the heat sink group is connected to the brushless motor by welding or is integrally formed with the housing of the brushless motor.

[0008] Further, an air outlet cover is arranged on the air outlet, the air outlet cover covers the outer periphery of the air outlet, and the air outlet cover is communicated with the exhaust duct of the sweeping robot through an air duct.

[0009] Further, a check sheet is arranged on the air outlet, the check sheet is made of silica gel, the check sheet covers the outer side of the air outlet, the upper end of the check sheet is clamped at the upper part of the air outlet by the air outlet cover, and the lower end of the check sheet can be lifted under the blowing of air flow.

[0010] Beneficial effects of the present utility model: the brushless motor is installed in the housing through the heat sink group, which increases the heat dissipation area; the air duct is formed by blocking of the heat sinks, so that air flow can contact the heat sinks for heat exchange, improving heat dissipation efficiency; the heat dissipation fan can operate independently, and can continuously dissipate heat for the brushless motor when the brushless motor is stopped, avoiding problems such as shortened service life and demagnetization of the brushless motor caused by high temperature. Description of Drawings

[0011] Figure 1 is a structural schematic diagram of the present utility model;

[0012] Figure 2 is a structural schematic diagram of the air outlet cover of the present utility model;

[0013] Figure 3 is a structural schematic diagram of the heat sink group of the present utility model;

[0014] Figure 4 is a structural schematic diagram of the first heat sink and the second heat sink;

[0015] Figure 5 is a structural schematic diagram of the check sheet of the present utility model;

[0016] Figure 6 is a structural schematic diagram of the air flow path;

[0017] In the diagram: 1-outer shell, 2-brushless motor, 3-cooling fan, 5-cover plate, 6-first heat sink, 7-second heat sink, 8-short heat sink, 9-exhaust shroud, 10-backflow preventer. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Throughout the description, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0019] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0020] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of the stated features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0021] like Figures 1 to 6 As shown, an embodiment of this utility model provides a heat dissipation mechanism for a sweeping robot, including: a shell 1, a brushless motor 2, and a cooling fan 3. The outer periphery of the shell of the brushless motor 2 is provided with a heat sink assembly, and the brushless motor 2 is installed in the inner cavity of the shell 1 through the heat sink assembly. The output shaft of the brushless motor 2 extends outward from the shell 1. An air inlet is provided on one side of the shell 1, and an air outlet is provided on the other side of the shell 1. The cooling fan 3 is installed on the air inlet. The shell 1 has openings at both ends, and cover plates 5 are provided on the openings at both ends, and the cover plates 5 cover the openings.

[0022] The outer casing 1 is installed inside the sweeping robot, and the brushless motor 2 is mainly used for driving the dust suction device of the sweeping robot. When the brushless motor 2 operates, the coil generates a large amount of heat, causing the temperature of the brushless motor 2 to rise. At this time, the heat dissipation fan 3 is started, and sends external airflow into the outer casing 1 from the air inlet. Inside the outer casing 1, the airflow flows in a n-shaped path due to the obstruction of the first heat sink 6 and the second heat sink 7, so that the airflow fully contacts the heat sinks on the heat sink group, thereby taking away heat through the airflow and achieving the purpose of air cooling and temperature reduction. The heat-exchanged airflow is communicated with the exhaust duct of the sweeping robot through the air outlet cover 9 and the air duct, and the air duct is a square air duct of 50 mm × 30 mm, which has low airflow resistance, facilitates rapid airflow flow, and improves heat dissipation efficiency. The heat dissipation fan 3 can rotate independently, and can continue to rotate for heat dissipation after the brushless motor 2 is shut down, effectively avoiding the problem that heat cannot be dissipated after the brushless motor 2 is shut down, reducing the demagnetization speed of the permanent magnet in the brushless motor due to high temperature, and improving the service life of the brushless motor 2.

[0023] In a specific embodiment, as Figure 3 , Figure 4 , Figure 6 shows, the heat sink group comprises a first heat sink 6 and a second heat sink 7, the first heat sink 6 and the second heat sink 7 are respectively arranged at the upper part and the lower part of the brushless motor 2, one end of the first heat sink 6 and one end of the second heat sink 7 are closely attached to the inner wall of the cover plate 5 on one side of the outer casing 1, and a gap of 1 cm to 2 cm is reserved between the other end of the first heat sink 6 and the other end of the second heat sink 7 and the cover plate 5 on the other side of the outer casing 1. The outer casing 1 is divided into a n-shaped air duct by the first heat sink 6 and the second heat sink 7. Since one end of the first heat sink 6 and one end of the second heat sink 7 are closely attached to the inner wall of the cover plate 5 on one side of the outer casing 1, airflow cannot flow through this position. After entering the outer casing 1, the airflow can only flow to the gap first, bypass the obstruction of the first heat sink 6 and the second heat sink 7, then flow to the other side of the outer casing 1, and then be discharged from the air outlet. The n-shaped air duct can prolong the heat exchange time between the airflow and the heat sinks, so as to realize sufficient heat exchange.

[0024] In a specific embodiment, as Figure 3 shows, the heat sink group further comprises a short heat sink 8, one side of the short heat sink 8 is connected with the brushless motor 2, the other side of the short heat sink 8 is connected with the inner wall of the outer casing 1, and a gap of 1 cm to 2 cm is reserved between both ends of the short heat sink 8 and the cover plate 5. The short heat sink 8 is mainly used for increasing the heat exchange area and improving the heat dissipation efficiency. In addition, the short heat sink 8 also plays a role in fixing the brushless motor 2, so that the connection between the brushless motor 2 and the outer casing 1 is firm.

[0025] In a preferred embodiment, the heat sink assembly is connected to the brushless motor 2 by welding or integrally formed with the housing of the brushless motor 2. Both the heat sink assembly and the housing of the brushless motor 2 are made of metal. Since the heat sink needs to conduct heat, to ensure rapid heat conduction between the heat sink assembly and the housing of the brushless motor 2, the heat sink assembly can be connected to the brushless motor 2 by welding or integral forming. This allows the heat from the brushless motor 2 to be quickly conducted to the heat sink assembly, increasing the heat dissipation area.

[0026] In a preferred embodiment, such as Figure 2 As shown, an air outlet hood 9 is provided on the air outlet. The air outlet hood 9 covers the outer periphery of the air outlet, and the air outlet hood 9 is connected to the exhaust pipe of the sweeping robot through the air duct. The air outlet hood 9 can be easily connected to the air duct to exhaust hot air. The air duct is a 50mm×30mm square air duct with a large cross-sectional area, which facilitates the flow of air. The exhaust pipe of the sweeping robot refers to the channel for exhausting dust after the vacuuming device has sucked up the dust. Using this exhaust pipe to exhaust hot air can realize the flow of air, reduce the length of the air duct, and improve the space utilization rate.

[0027] In a preferred embodiment, such as Figure 5 As shown, a backflow preventer 10 is provided on the air outlet. The backflow preventer 10 is made of silicone and covers the outside of the air outlet. The upper end of the backflow preventer 10 is clamped to the upper part of the air outlet by the air outlet cover 9, and the lower end of the backflow preventer 10 can be lifted by the airflow. Since the air outlet cover 9 is connected to the exhaust pipe of the robot vacuum cleaner through the air duct, when the brushless motor 2 just starts to work, the temperature of the brushless motor 2 is low, so the cooling fan 3 does not work. The airflow in the exhaust pipe of the robot vacuum cleaner may enter the outer casing 1 along the air duct, but... Although the airflow in the exhaust pipe of the robot vacuum cleaner is filtered, it still carries dust. Long-term flow into the outer shell 1 can easily cause dust to adhere to the heat sink, reducing heat exchange efficiency. Therefore, a backflow preventer 10 is provided on the air outlet. When the airflow generated by the cooling fan 3 is discharged through the air outlet, it can blow the lower end of the backflow preventer 10 up and discharge it. When the airflow in the exhaust pipe of the robot vacuum cleaner enters, it will press the backflow preventer 10 tightly against the air outlet, thereby preventing the airflow from entering the outer shell 1 and realizing one-way control of the airflow.

[0028] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A heat dissipation mechanism of a robot sweeper, characterized in that, Comprising: a housing (1), a brushless motor (2), and a heat dissipation fan (3), wherein a heat sink group is arranged on the outer periphery of the housing of said brushless motor (2), said brushless motor (2) is installed in the inner cavity of the housing (1) via the heat sink group, and the output shaft of the brushless motor (2) extends outward from the housing (1); an air inlet is provided on one side of said housing (1), an air outlet is provided on the other side of said housing (1), said heat dissipation fan (3) is installed on the air inlet, both ends of said housing (1) are open, and cover plates (5) are respectively provided on the openings at both ends, and the cover plates (5) seal the openings; said heat sink group comprises a first heat sink (6) and a second heat sink (7), said first heat sink (6) and said second heat sink (7) are respectively arranged at the upper and lower parts of the brushless motor (2), one end of said first heat sink (6) and one end of said second heat sink (7) are closely attached to the inner wall of the cover plate (5) on one side of the housing (1), a gap of 1 cm to 2 cm is left between the other end of the first heat sink (6) and the other end of the second heat sink (7) and the cover plate (5) on the other side of the housing (1), and the housing (1) is divided into a "\u25ce"-shaped air duct by the first heat sink (6) and the second heat sink (7); an air outlet cover (9) is provided on the air outlet, the air outlet cover (9) covers the outer periphery of the air outlet, and the air outlet cover (9) is communicated with the exhaust pipe of the sweeping robot via an air duct; a non-return sheet (10) is provided on the air outlet, the non-return sheet (10) is made of silica gel, the non-return sheet (10) covers the outer side of the air outlet, the upper end of the non-return sheet (10) is clamped at the upper part of the air outlet by the air outlet cover (9), and the lower end of the non-return sheet (10) can be lifted under the blowing of airflow.

2. The heat dissipation mechanism of the sweeping robot according to claim 1, wherein, said heat sink group further comprises a short heat sink (8), one side of said short heat sink (8) is connected to the brushless motor (2), the other side of said short heat sink (8) is connected to the inner wall of the housing (1), and a gap of 1 cm to 2 cm is left between both ends of said short heat sink (8) and the cover plates (5).

3. The heat dissipation mechanism of the sweeping robot according to claim 2, wherein, said heat sink group is connected with the brushless motor (2) by welding or is integrally formed with the housing of the brushless motor (2).

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