Air duct structure beneficial to heat dissipation of electrical component and heating device

Abstract

The utility model discloses an air duct structure beneficial to heat dissipation of electrical components, which comprises a shell, a heat dissipation air duct is arranged in the shell, the heat dissipation air duct comprises an air inlet and an air outlet which are communicated with the outside, airflow in the heat dissipation air duct flows from the air inlet to the air outlet, and an electrical cavity is arranged in the heat dissipation air duct and is close to the air inlet. The fan is communicated with the air inlet and the air outlet; an electric appliance element is arranged in the electric appliance cavity, and airflow flowing from the air inlet to the air outlet firstly flows through the electric appliance element. According to the utility model, the electric appliance cavity is arranged at the air inlet, so that airflow flows through the electric appliance cavity after entering the heat dissipation air channel from the air inlet, the airflow does not exchange heat with parts in the heat dissipation air channel, the temperature of the airflow is lowest, and the temperature difference between the airflow and an electric appliance element is maximum; the heat exchange efficiency between the electric appliance elements is improved by cooling the electric appliance elements through airflow, and the heat dissipation effect of the electric appliance elements is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of household appliances, specifically relating to an air duct structure and heating device that facilitates heat dissipation of electrical components. Background Technology

[0002] Most household appliances have heating functions, especially kitchen appliances, which frequently need to heat food. During use, the internal electrical components of these appliances generate heat, especially those with heating functions. This can cause the internal temperature of the appliances to rise, leading to burns in the high-temperature environment and consequently shortening the lifespan of the components.

[0003] In existing technologies, such as patent document CN216020654U, a food processor with a heat dissipation duct is disclosed. This duct dissipates heat from the motor by placing a cooling fan below the motor. However, this heat dissipation structure primarily targets the motor. During operation, other electrical components also generate heat, making it difficult for this structure to adequately cool them. This can easily lead to overheating of other components, consequently shortening their lifespan. Summary of the Invention

[0004] To address the problems in the existing technology, this utility model proposes an air duct structure and heating device that facilitates heat dissipation of electrical components. By placing the electrical cavity at the air inlet, when the airflow enters the heat dissipation air duct from the air inlet, it first flows through the electrical cavity, allowing the airflow to dissipate heat from the electrical components inside the electrical cavity at the lowest temperature, thereby improving the heat dissipation effect of the electrical components.

[0005] This invention is achieved as follows: a duct structure for facilitating heat dissipation of electrical components includes a housing, within which a heat dissipation duct is provided, and the heat dissipation duct has an air inlet and an air outlet connecting to the outside.

[0006] The initial section of the heat dissipation duct is provided with a closed or semi-closed electrical cavity, which contains electrical components. The air inlet of the electrical cavity is aligned in a straight line with and directly connected to the air inlet.

[0007] An enclosed electrical cavity refers to an electrical cavity with enclosed side panels on its periphery and top and bottom sides. A semi-enclosed electrical cavity refers to an electrical cavity with at least one enclosed side panel on its periphery and top and bottom sides. However, enclosed does not mean sealed; an enclosed electrical cavity can still communicate with the outside world.

[0008] The electrical cavity has an outlet at its air outlet, and the housing also has a hollow cavity. The outlet connects the electrical cavity to the hollow cavity, forming the middle section of the heat dissipation duct. A venting pipe is located at the rear of the heat dissipation duct. A stirring assembly and a fan are sequentially arranged within the venting pipe along the airflow direction. The inlet of the venting pipe connects to the hollow cavity, and the outlet extends to the air outlet. The fan accelerates the airflow within the heat dissipation duct, allowing cool air from the outside to quickly enter and cool air to quickly exit, preventing the high-temperature air from lingering and improving the heat dissipation effect. Furthermore, the fan draws air from the middle section of the duct towards the venting pipe, increasing the airflow within the venting pipe and allowing the air to carry away more heat, further enhancing the heat dissipation effect of the stirring assembly.

[0009] External airflow passes directly through the air inlet into the electrical cavity and over the surface of the electrical components. It then enters the cavity through the notch and is finally discharged through the exhaust duct and outlet. When airflow flows from the air inlet into the heat dissipation duct, it does not exchange heat with the components within the duct, resulting in the lowest airflow temperature. At this point, the temperature difference between the airflow and the electrical components is maximized. The airflow cools the electrical components, improving the heat exchange efficiency between them and thus enhancing the heat dissipation effect of the electrical components.

[0010] Preferably, the electrical cavity is further provided with heat dissipation fins adapted to the electrical component. The heat dissipation fins are located above the electrical component and are thermally connected to it. The heat dissipation fins increase the heat dissipation area of ​​the electrical component. When the airflow passes through the heat dissipation fins, it can make full contact with the fins, allowing the heat on the fins to be carried away more quickly. After the heat is quickly carried away from the fins, the heat from the electrical component can be quickly transferred to the heat dissipation fins, further improving the heat dissipation efficiency of the electrical component.

[0011] Specifically, the electrical cavity has multiple ventilation holes on its sidewall corresponding to the air inlet. These ventilation holes correspond to the heat dissipation fins, and the openings of the ventilation holes are smaller than the openings of the air inlet. Because the openings of the ventilation holes are smaller than the openings of the air inlet, when airflow passes through the ventilation holes, the ventilation holes throttle the airflow. According to the Joule-Thomson effect, when the gas pressure decreases during throttling, if the Joule-Thomson coefficient is positive, the gas will absorb heat and expand, leading to a temperature drop. For most gases, such as air, the Joule-Thomson coefficient is positive at normal temperature and pressure. Therefore, when the airflow passes through the ventilation holes, the airflow cools down, further increasing the temperature difference between the airflow and the electrical components, thereby further improving the heat exchange efficiency between the airflow and the electrical components, and ultimately improving the heat dissipation efficiency of the electrical components.

[0012] Specifically, a filter chamber is provided between the air inlet and the electrical cavity, and the filter chamber contains a breathable filter unit that covers the ventilation holes. The filter unit is used to filter the airflow entering the heat dissipation duct to reduce dust entering the electrical cavity. This ensures ventilation of the electrical cavity while also protecting it from dust, thus preventing dust from reducing the heat dissipation effect of the electrical components or even causing short circuits.

[0013] Preferably, the rear section of the heat dissipation duct further includes a noise-reducing section, which is located after and connected to the exhaust duct. The noise-reducing section has an inclined air guide at its first end. The noise-reducing section reduces noise when the airflow exits the exhaust port, improving the quietness of the heat dissipation duct. The air guide directs the airflow within the noise-reducing section towards the exhaust port, allowing the airflow within the noise-reducing section to be quickly discharged from the exhaust port.

[0014] Specifically, the silencing section is meandering, in an S-shape, a near-S-shape, or a wave shape, and its end connects to the air outlet. The meandering silencing section alters the airflow direction within it, thereby reducing the airflow velocity and the turbulence intensity generated by the high-speed airflow, thus lowering the noise generated by the airflow.

[0015] Preferably, the stirring assembly includes a drive shaft adapted to the fan, and the fan is driven by the drive shaft, so that the fan and the stirring assembly start and stop synchronously. By driving the fan to rotate through the stirring assembly, the fan can operate normally without an additional power source, which not only reduces the cost of the air duct structure but also reduces the heat generated within the heat dissipation duct, thereby improving the heat dissipation effect of the heat dissipation duct.

[0016] Preferably, the electrical cavity also includes a circuit board, on which the electrical components are mounted. The circuit board also has ventilation holes connecting its upper and lower sides. These ventilation holes create an airflow channel between the upper and lower sides of the circuit board. When airflow passes through the electrical cavity, this channel increases the airflow circulation rate within the cavity, further enhancing its heat dissipation effect.

[0017] A heating device includes the aforementioned air duct structure, which improves the heat dissipation effect of the heating device.

[0018] Preferably, it also includes a stirring chamber, wherein a rotating blade is provided in the stirring chamber extending from bottom to top, and the rotating blade is connected to the stirring assembly in a driving connection; a heating unit is provided below the stirring chamber and installed in the heat dissipation duct, and the heating unit is connected to the stirring chamber in a heat transfer connection.

[0019] The beneficial effects of this utility model are:

[0020] This utility model proposes an air duct structure and heating device that facilitates heat dissipation of electrical components. By placing the electrical cavity at the air inlet, when the airflow enters the heat dissipation air duct from the air inlet, it first flows through the electrical cavity. The airflow does not exchange heat with the components in the heat dissipation air duct, and the temperature of the airflow is at its lowest. At this time, the temperature difference between the airflow and the electrical components reaches its maximum. The airflow cools the electrical components, improving the heat exchange efficiency between them, thereby improving the heat dissipation effect of the electrical components. Attached Figure Description

[0021] Figure 1 This is an overall sectional view of the air duct structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the airflow direction after the air duct structure of this utility model is concealed by the shell;

[0023] Figure 3 This is an isometric side sectional view of the concealed housing of the air duct structure of this utility model.

[0024] Figure 4 for Figure 3 An enlarged schematic diagram of point a;

[0025] Figure 5 This is an overall cross-sectional view of the heating device of this utility model.

[0026] Figure label:

[0027] 1. Shell; 2. Stirring chamber; 3. Heating unit; 4. Rotating blade; 11. Air inlet; 12. Air outlet; 13. Electrical cavity; 14. Filter chamber; 15. Container cavity; 16. Exhaust duct; 17. Silencing section; 131. Electrical components; 132. Heat dissipation fins; 133. Circuit board; 134. Ventilation hole; 161. Stirring assembly; 162. Fan; 171. Air guide section; 1331. Air passage hole. Detailed Implementation

[0028] 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 a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1

[0030] like Figures 1-4 As shown, a heat dissipation duct structure for electrical component 131 includes a housing 1, within which a heat dissipation duct is provided. The heat dissipation duct has an air inlet 11 and an air outlet 12 that connect to the outside.

[0031] The initial section of the heat dissipation duct is provided with a closed or semi-closed electrical cavity 13, which contains electrical components 131. The air inlet of the electrical cavity 13 is aligned in a straight line with the air inlet 11 and is directly connected.

[0032] A closed electrical cavity 13 refers to an electrical cavity 13 having enclosed side plates on its periphery and both the top and bottom sides. A semi-closed electrical cavity 13 refers to an electrical cavity 13 having no enclosed side plate on at least one side of its periphery and both the top and bottom sides. However, being closed does not mean being sealed; a closed electrical cavity 13 can still communicate with the outside world.

[0033] In this embodiment, the electrical cavity 13 is further provided with heat dissipation fins 132 adapted to the electrical component 131. The heat dissipation fins 132 are located above the electrical component 131 and are thermally connected to the electrical component 131. The heat dissipation fins 132 increase the heat dissipation area of ​​the electrical component 131. When the airflow passes through the heat dissipation fins 132, it can fully contact the heat dissipation fins 132, allowing the heat on the heat dissipation fins 132 to be carried away by the airflow more quickly. After the heat on the heat dissipation fins 132 is quickly carried away, the heat of the electrical component 131 can be quickly transferred to the heat dissipation fins 132, further improving the heat dissipation efficiency of the electrical component 131.

[0034] Specifically, the electrical cavity 13 has multiple ventilation holes 134 on its sidewall corresponding to the air inlet 11. These ventilation holes 134 correspond to the heat dissipation fins 132, and their openings are smaller than the openings of the air inlet 11. Because the openings of the ventilation holes 134 are smaller than those of the air inlet 11, when airflow passes through the ventilation holes 134, the ventilation holes throttle the airflow. According to the Joule-Thomson effect, when the gas pressure decreases during throttling, if the Joule-Thomson coefficient is positive, the gas will absorb heat and expand, leading to a temperature drop. For most gases, such as air, the Joule-Thomson coefficient is positive at normal temperature and pressure. Therefore, when the airflow passes through the ventilation holes 134, the airflow will cool down, further increasing the temperature difference between the airflow and the electrical component 131, thereby further improving the heat exchange efficiency between the airflow and the electrical component 131, and ultimately improving the heat dissipation efficiency of the electrical component 131.

[0035] Specifically, a filter chamber 14 is provided between the air inlet 11 and the electrical cavity 13. The filter chamber 14 contains a breathable filter unit that covers the ventilation hole 134. The filter unit filters the airflow entering the heat dissipation duct to reduce dust entering the electrical cavity 13. This ensures ventilation of the electrical cavity 13 while maintaining its dustproof properties, thus preventing dust from reducing the heat dissipation effect of the electrical component 131 or even causing a short circuit.

[0036] In this embodiment, a circuit board 133 is also provided inside the electrical cavity 13, and the electrical components 131 are mounted on the circuit board 133. The circuit board 133 is also provided with ventilation holes 1331, which connect the upper and lower sides of the circuit board 133. These ventilation holes create an airflow channel between the upper and lower sides of the circuit board 133. When the airflow passes through the electrical cavity 13, the airflow channel increases the airflow circulation rate within the electrical cavity 13, further improving the heat dissipation effect of the electrical cavity 13.

[0037] The electrical cavity 13 has an opening at its air outlet. The housing 1 also has a hollow cavity 15. The opening connects the electrical cavity 13 to the cavity 15, making the cavity 15 the middle section of a heat dissipation duct. The rear section of the heat dissipation duct has an exhaust pipe 16. Along the airflow direction, a stirring assembly 161 and a fan 162 are sequentially arranged within the exhaust pipe 16. The input end of the exhaust pipe 16 connects to the cavity 15, and the output end extends to the air outlet 12. The fan 162 accelerates heat dissipation. The airflow velocity within the duct allows outside air to quickly enter the cooling duct as a low-temperature airflow, and also allows the high-temperature airflow formed after heat absorption to quickly exit the cooling duct, preventing the high-temperature airflow from lingering within the cooling duct and thus improving the cooling effect of the cooling duct. On the other hand, by using a suction method, the airflow in the middle section of the cooling duct converges towards the suction pipe 16, increasing the airflow within the suction pipe 16, thereby allowing the airflow to carry away more heat and further improving the cooling effect of the stirring component 161.

[0038] External airflow passes directly through the air inlet 11, through the electrical cavity 13, and over the surface of the electrical component 131. It then enters the cavity 15 through the notch and is finally discharged through the exhaust duct 16 and the air outlet 12. When airflow flows from the air inlet 11 into the heat dissipation duct, the airflow does not exchange heat with the components within the duct, resulting in the lowest airflow temperature. At this point, the temperature difference between the airflow and the electrical component 131 reaches its maximum. The airflow cools the electrical component 131, improving the heat exchange efficiency between them and thus enhancing the heat dissipation effect of the electrical component 131.

[0039] In this embodiment, the rear section of the heat dissipation duct further includes a noise-reducing section 17. The noise-reducing section 17 is located after the exhaust duct 16 and is connected to the exhaust duct 16. The first end of the noise-reducing section 17 is provided with an inclined air guide 171. The noise-reducing section 17 is used to reduce the noise when the airflow is discharged from the air outlet 12, thereby improving the quietness of the three-way air duct. The air guide 171 is used to guide the airflow in the noise-reducing section 17 to the air outlet 12, so that the airflow in the noise-reducing section 17 can be quickly discharged from the air outlet 12.

[0040] Specifically, the silencing section 17 is meandering in an S-shape, and its end is connected to the air outlet 12. The meandering silencing section 17 alters the airflow direction within it, thereby reducing the airflow velocity and the turbulence intensity, thus lowering the noise generated by the airflow.

[0041] In this embodiment, the stirring assembly 161 includes a drive shaft adapted to the fan 162. The fan 162 is connected to the drive shaft, enabling the fan 162 and the stirring assembly 161 to start and stop synchronously. By driving the fan 162 to rotate through the stirring assembly 161, the fan 162 can operate normally without an additional power source. This not only reduces the cost of the air duct structure but also reduces the heat generated within the heat dissipation duct, thereby improving the heat dissipation effect of the heat dissipation duct.

[0042] Example 2

[0043] like Figure 5 As shown, a heating device includes the air duct structure in Embodiment 1, which improves the heat dissipation effect of the heating device.

[0044] In this embodiment, a stirring chamber 2 is also included, and a rotating blade 4 is provided inside the stirring chamber 2 extending from bottom to top; a heating unit 3 is provided below the stirring chamber 2 and installed in the heat dissipation duct 1, and the heating unit 3 is thermally connected to the stirring chamber 2.

[0045] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A wind channel structure for facilitating heat dissipation of an electrical component, comprising a housing, a heat dissipation wind channel being provided in the housing, the heat dissipation wind channel being provided with an air inlet and an air outlet which are in communication with the outside, characterized in that: an initial section of the heat dissipation wind channel is provided with a closed or semi-closed electrical component cavity, the electrical component cavity is provided with the electrical component, an air inlet end of the electrical component cavity is in linear alignment with the air inlet and directly communicates with the air inlet, an air outlet end of the electrical component cavity is provided with an aperture, a hollow cavity is further provided in the housing, the aperture communicates the electrical component cavity with the cavity, and the cavity forms a middle section of the heat dissipation wind channel, a rear section of the heat dissipation wind channel is provided with an air extraction pipeline, a stirring assembly and a fan are sequentially provided in the air extraction pipeline along the airflow direction, an input end of the air extraction pipeline communicates with the cavity, and an output end of the air extraction pipeline extends to the air outlet. External airflow linearly penetrates the electrical component cavity through the air inlet, flows through the surface of the electrical component, enters the cavity through the aperture, and is finally discharged through the air outlet by the air extraction pipeline. A heat dissipation fin which is adapted to the electrical component is further provided in the electrical component cavity, the heat dissipation fin is provided above the electrical component and is in heat transfer connection with the electrical component.

2. The air duct structure according to claim 1, wherein A plurality of ventilation holes are provided on the side wall of the electrical component cavity corresponding to the air inlet, the ventilation holes correspond to the heat dissipation fin, and the opening of the ventilation holes is smaller than the opening of the air inlet.

3. The air duct structure according to claim 2, wherein A filter cavity is further provided between the air inlet and the electrical component cavity, a gas-permeable filter unit is provided in the filter cavity, and the filter unit covers the ventilation holes.

4. The air duct structure according to claim 3, wherein The rear section of the heat dissipation wind channel further comprises a sound attenuation section, the sound attenuation section is provided behind the air extraction pipeline and communicates with the air extraction pipeline, and a wind guide part which is obliquely arranged is provided at the leading end of the sound attenuation section.

5. The air duct structure according to claim 1, wherein The sound attenuation section is arranged in a meandering manner, in an S shape, a similar S shape or a wave shape, and the trailing end of the sound attenuation section communicates with the air outlet.

6. The air duct structure according to claim 5, wherein The stirring assembly comprises a transmission shaft which is adapted to the fan, the fan is in transmission connection with the transmission shaft, so that the fan and the stirring assembly are synchronously started and stopped.

7. The air duct structure according to claim 1, wherein A circuit board is further provided in the electrical component cavity, the electrical component is mounted on the circuit board, and a ventilation hole is further provided on the circuit board, the ventilation hole communicates the upper and lower sides of the circuit board.

8. The air duct structure according to claim 1, wherein The wind channel structure according to any one of claims 1-8 is included.

9. A heating device, characterized by A stirring cavity is further included, a rotary cutter which extends into the stirring cavity from bottom to top is provided in the stirring cavity, the rotary cutter is in transmission connection with the stirring assembly, a heating unit is provided below the stirring cavity and is mounted in the heat dissipation wind channel, and the heating unit is in heat transfer connection with the stirring cavity.

10. A heating device according to claim 9, wherein ​

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