Self-cleaning extractor hood

Abstract

The utility model provides a kind of self-cleaning range hood, including impeller, impeller is made of conductive material, self-cleaning range hood further include coil, coil is used to pass into alternating current to produce varying magnetic field, impeller is arranged in magnetic field, and moves in magnetic field to cut magnetic field;The above-mentioned self-cleaning technology does not need additional waterway design, completely eliminates the risk of water leakage and the risk of electric leakage due to water leakage.In addition, impeller moves in magnetic field to cut magnetic field, and then closed induction current (i.e. eddy current) will be generated in impeller, joule heat is generated due to resistance, thereby for heating impeller, to heat and melt oil dirt on impeller, finally, molten oil dirt is effectively stripped under the action of centrifugal force generated by high-speed rotation of impeller.Such setting generates electricity using magnetic field, energy consumption is small, and induction current is directly generated on impeller, without transmission loss, further reduce energy consumption, and heat conversion efficiency is relatively high.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliances, and in particular to a self-cleaning range hood. Background Technology

[0002] In existing range hoods, stubborn grease easily accumulates inside the fan system over time, adhering to the impeller, volute, and duct surfaces. This leads to a series of problems, including reduced airflow, decreased air pressure, and continuously increasing energy consumption. To address these issues, current range hood self-cleaning technologies typically employ high-temperature steam cleaning and thermal radiation degreasing techniques to achieve automatic cleaning.

[0003] High-temperature water-based cleaning technology uses a spray arm to precisely spray high-temperature steam onto the impeller surface, utilizing the thermal energy and penetrating power of the steam to quickly dissolve stubborn oil stains. Subsequently, the powerful impact of high-pressure water jets thoroughly washes away the dissolved oil stains, thus achieving cleaning.

[0004] Thermal radiation degreasing technology integrates heating modules (such as metal heating wires or ceramic coatings) on the impeller surface to instantly heat the impeller to over 100°C, rapidly dissolving the oil stains. Subsequently, the centrifugal force generated by the high-speed rotation of the impeller throws the dissolved oil stains off the impeller surface and smoothly discharges them through the oil guide groove, thereby achieving degreasing.

[0005] However, the aforementioned high-temperature water-based cleaning requires regular replacement of the water in the tank. Hard water is prone to producing scale, and some models may experience leakage due to insufficient waterproofing design. The thermal degreasing technology relies on the continuous heating of the heating module, resulting in low heat conversion efficiency and relatively high energy consumption. Utility Model Content

[0006] The technical problem to be solved by this utility model is to overcome the defects of existing technologies, such as high-temperature water-based cleaning causing leakage and low thermal conversion efficiency and relatively high energy consumption of hot-wave degreasing technology, and to provide a self-cleaning range hood.

[0007] The present invention solves the above-mentioned technical problems through the following technical solution:

[0008] A self-cleaning range hood includes an impeller made of a conductive material. The self-cleaning range hood also includes a coil for passing an alternating current to generate a changing magnetic field. The impeller is positioned in the magnetic field and is able to move in the magnetic field to cut the magnetic field.

[0009] In this solution, the aforementioned self-cleaning technology requires no additional water system design, completely eliminating the risk of water leakage and the risk of electrical leakage due to water leakage. Furthermore, the impeller moves within the magnetic field, cutting through the magnetic field, thereby generating a closed-loop induced current (i.e., eddy current) within the impeller. This eddy current generates Joule heat due to resistance, which is used to heat the impeller and melt the grease on it. Finally, the molten grease is effectively stripped off by the centrifugal force generated by the high-speed rotation of the impeller. This setup utilizes a magnetic field to generate electricity, resulting in low energy consumption. Moreover, the induced current is generated directly on the impeller, eliminating transmission losses and further reducing energy consumption, leading to high thermal conversion efficiency.

[0010] Preferably, the self-cleaning range hood also includes a volute, and the impeller is installed inside the volute via a rotating shaft and a mounting bracket. The impeller is sleeved on the rotating shaft, and the rotating shaft is mounted on the mounting bracket.

[0011] In this context, along the axial direction of the rotating shaft or along the axial direction parallel to the rotating shaft, the side of the impeller closer to the mounting bracket is called the proximal side, and the side farther from the mounting bracket is called the distal side.

[0012] The coil is mounted on the proximal side and / or the distal side.

[0013] In this scheme, the installation positions of the impeller and the coil are conducive to the magnetic field generated by the coil penetrating the thickness of the impeller, and also make it easier for the impeller to cut the magnetic field, which is conducive to achieving high thermal conversion efficiency with low energy consumption.

[0014] Preferably, the coil is mounted on the proximal side and is disposed on the mounting bracket.

[0015] In this design, installing the coil on the near side will not have a significant impact on the air intake. Furthermore, the range hood in this application mainly relies on the far side for air intake, meaning that the above arrangement can minimize the impact on the air intake efficiency of the range hood.

[0016] Preferably, the coils are arranged in a ring along the rotational trajectory of the impeller.

[0017] In this design, the coils are arranged in a ring along the rotation trajectory of the impeller. On the one hand, this matches the shape of the impeller, which can maximize the magnetic field range. On the other hand, since the mounting bracket is close to the impeller, the magnetic field is close to the impeller, thereby improving the efficiency of generating induced current on the impeller.

[0018] Preferably, the proximal end is the side furthest from the user, and the distance between the coil and the blade of the impeller near the user is 10-15cm.

[0019] In this design, the coil is positioned far from the user to prevent discomfort caused by the magnetic field generated by the coil. Additionally, this arrangement keeps the coil away from the air intake, minimizing its impact on airflow.

[0020] Preferably, the alternating current is provided by a frequency converter so that the current frequency and magnetic field strength of the alternating current are adjustable.

[0021] In this solution, the current frequency and magnetic field strength of the alternating current are adjustable. This setting can adjust the current frequency and magnetic field strength of the alternating current to the most suitable level according to the amount and difficulty of removing oil stains, so as to prevent the oil stains from being not completely removed or the alternating current energy from being wasted.

[0022] Preferably, the current frequency is in the range of 50Hz-500Hz, and the magnetic field strength is in the range of 0.1T-1T;

[0023] And / or, the self-cleaning range hood also includes a temperature safety valve and a temperature sensor, the temperature sensor being mounted on the impeller and used to detect the temperature of the impeller;

[0024] The temperature safety valve is configured to disconnect the power supply to the coil when the temperature detected by the temperature sensor exceeds 200°C.

[0025] In this design, the current frequency ranges from 50Hz to 500Hz, and the magnetic field strength ranges from 0.1T to 1T. This configuration reduces energy consumption while effectively removing grease. Furthermore, the self-cleaning range hood includes a temperature safety valve and a temperature sensor. The temperature sensor is mounted on the impeller and is used to detect its temperature. The temperature safety valve is configured to disconnect the inverter power supply to the coil when the temperature detected by the temperature sensor exceeds 200℃. This configuration ensures that the heating temperature does not exceed the limit, thereby preventing localized overheating damage to the impeller and avoiding grease carbonization.

[0026] Preferably, a motor is installed inside the volute, and the motor is used to drive the impeller to rotate;

[0027] The surface of the motor or the exterior of the motor is equipped with an electromagnetic shielding structure.

[0028] In this solution, the electromagnetic shielding structure can suppress magnetic field leakage and prevent interference with the operation of the motor's internal magnetic field.

[0029] Preferably, the impeller is made of a conductive metal, such as stainless steel or aluminum alloy.

[0030] In this design, the conductive metal is stainless steel or aluminum alloy, which results in good conductivity.

[0031] Preferably, the coil is an electromagnetic coil.

[0032] In this design, the coil is an electromagnetic coil to increase the strength and range of the magnetic field it generates, thereby improving the efficiency of the impeller in generating current.

[0033] The significant advantages of this invention are as follows: the self-cleaning technology eliminates the need for additional water system design, completely preventing the risk of water leakage and subsequent electrical leakage. Furthermore, the impeller's movement within the magnetic field cuts the magnetic field, generating a closed-loop induced current (eddy current) within the impeller. This eddy current, due to resistance, produces Joule heat, which heats the impeller to melt the grease deposits. Finally, the molten grease is effectively stripped away by the centrifugal force generated by the impeller's high-speed rotation. This design utilizes a magnetic field to generate electricity, resulting in low energy consumption. Moreover, the induced current is directly generated on the impeller, eliminating transmission losses and further reducing energy consumption, leading to high thermal conversion efficiency. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of a self-cleaning range hood according to an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the internal structure of a self-cleaning range hood according to an embodiment of the present invention.

[0036] Figure 3 This is a schematic diagram of another internal structure of a self-cleaning range hood according to an embodiment of the present invention.

[0037] Figure 4 This is a three-dimensional structural diagram of a coil according to an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] Self-cleaning range hood 100

[0040] Impeller 1

[0041] Coil 2

[0042] Rotation axis 3

[0043] Mounting bracket 4 Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and by way of embodiments, but the present invention is not limited to the scope of the embodiments thereon.

[0045] like Figure 1-4 As shown, this embodiment provides a self-cleaning range hood 100. The self-cleaning range hood 100 includes an impeller 1 made of a conductive material. The self-cleaning range hood 100 also includes a coil 2, which is used to pass an alternating current to generate a changing magnetic field. The impeller 1 is placed in the magnetic field and can move in the magnetic field to cut the magnetic field.

[0046] In this embodiment, the self-cleaning technology eliminates the need for additional water system design, completely preventing the risk of water leakage and subsequent electrical leakage. Furthermore, the impeller 1 moves within the magnetic field, cutting through it, thereby generating a closed-loop induced current (i.e., eddy current) within the impeller 1. This current generates Joule heating due to resistance, which heats the impeller 1 to melt the grease deposits. Finally, the molten grease is effectively stripped off by the centrifugal force generated by the high-speed rotation of the impeller 1. This setup utilizes a magnetic field to generate electricity, resulting in low energy consumption. The induced current is directly generated on the impeller 1, eliminating transmission losses and further reducing energy consumption, leading to high thermal conversion efficiency. The aforementioned magnetic field can also be generated by other components, such as magnets. Figure 1-2 As shown, the self-cleaning range hood 100 also includes a volute housing. An impeller 1 is mounted inside the volute housing via a rotating shaft 3 and a mounting bracket 4. The impeller 1 is sleeved on the rotating shaft 3, which is mounted on the mounting bracket 4. Along the axial direction of the rotating shaft 3 or along an axial direction parallel to the rotating shaft 3, the side of the impeller 1 closer to the mounting bracket 4 is the proximal side, and the side farther from the mounting bracket 4 is the distal side. Depending on actual installation requirements, the coil 2 can be installed on the proximal side and / or the distal side.

[0047] In this embodiment, the installation positions of the impeller 1 and the coil 2 are conducive to the magnetic field generated by the coil 2 penetrating the thickness of the impeller 1, and make it easier for the impeller 1 to cut the magnetic field, which is conducive to achieving a higher thermal conversion efficiency with lower energy consumption.

[0048] It should be noted that both the proximal and distal sides can receive air, but the distal side is the primary air intake side, and as... Figure 2-3 As shown, the mounting bracket has multiple cutouts to facilitate the entry of air.

[0049] Specifically, in this embodiment, such as Figure 3 As shown, coil 2 is mounted on the near end side and is mounted on the mounting bracket 4.

[0050] In this embodiment, the installation of coil 2 on the near end side will not have a significant impact on the air intake. In addition, the range hood of this application mainly relies on the far end side for air intake, which means that the above arrangement can minimize the impact on the air intake efficiency of the range hood.

[0051] It should be noted that the mounting bracket 4 is also ring-shaped to match the shape of the coil 2.

[0052] like Figure 3 As shown, coil 2 is distributed in a ring along the rotation trajectory of impeller 1.

[0053] In this embodiment, the coil 2 is arranged in a ring along the rotation trajectory of the impeller 1. On the one hand, it matches the shape of the impeller 1 and can maximize the magnetic field range. On the other hand, since the mounting bracket 4 is close to the impeller 1, the magnetic field is close to the impeller 1, thereby improving the generation efficiency of induced current on the impeller 1.

[0054] like Figure 1-2 As shown, the near end is the side away from the user, and the distance between the coil 2 and the blade of the impeller 1 near the user is 10-15cm.

[0055] In this embodiment, the above-described arrangement positions the coil 2 at a distance from the user to prevent the magnetic field generated by the coil 2 from causing discomfort to the user. Furthermore, this arrangement keeps the coil 2 away from the air inlet, which helps to reduce its impact on the airflow.

[0056] The alternating current is provided by a frequency converter so that the current frequency and magnetic field strength of the alternating current can be adjusted.

[0057] In this embodiment, the current frequency and magnetic field strength of the alternating current are adjustable. This setting can adjust the current frequency and magnetic field strength of the alternating current to the most suitable level according to the amount of oil stains, the difficulty of removing them, etc., so as to prevent the oil stains from being not completely removed or the alternating current energy from being wasted.

[0058] It should be noted that the variable frequency power supply (not shown in the attached diagram) can be installed outside or inside the range hood, as long as it is guaranteed not to be damaged by the high temperature inside the range hood.

[0059] Preferably, the current frequency ranges from 50Hz to 500Hz, and the magnetic field strength ranges from 0.1T to 1T. Furthermore, the self-cleaning range hood 100 also includes a temperature safety valve and a temperature sensor. The temperature sensor is mounted on the impeller 1 and is used to detect the temperature of the impeller 1. The temperature safety valve is configured to disconnect the power supply to the coil 2 when the temperature detected by the temperature sensor exceeds 200°C.

[0060] In this embodiment, the current frequency ranges from 50Hz to 500Hz, and the magnetic field strength ranges from 0.1T to 1T. This setting can reduce energy consumption while effectively removing oil stains.

[0061] For example, in actual use, the strength of the magnetic field can be adjusted accordingly for different airflow rates. As an example, in low airflow mode (airflow ≤ 10m³ / min), the magnetic field strength is selected as 0.2T and the magnetic field frequency as 100Hz; in high airflow mode (airflow greater than or equal to 20m³ / min), the magnetic field strength is selected as 0.4T and the magnetic field frequency as 300Hz.

[0062] In addition, the self-cleaning range hood 100 also includes a temperature safety valve and a temperature sensor. The temperature sensor is installed on the impeller 1 and is used to detect the temperature of the impeller 1. The temperature safety valve is configured to disconnect the power supply to the coil 2 when the temperature detected by the temperature sensor exceeds 200°C. The above settings ensure that the heating temperature does not exceed the limit, thereby preventing local overheating damage to the impeller 1 and avoiding carbonization of oil stains.

[0063] Of course, as an alternative, when the temperature detected by the temperature sensor exceeds 200°C, the temperature of impeller 1 can also be reduced by decreasing the current frequency.

[0064] An electric motor is installed inside the volute, which drives the impeller 1 to rotate; an electromagnetic shielding structure is provided on the surface of the motor or on the outside of the motor.

[0065] In this embodiment, the electromagnetic shielding structure can suppress magnetic field leakage and prevent interference with the operation of the internal magnetic field of the motor.

[0066] It should be noted that the electromagnetic shielding structure mentioned above can be a coating on the surface of the motor or other components; in addition, a physical isolation component is also provided on the outside of the motor to prevent the motor from coming into contact with any other structure of the range hood and to prevent affecting the operation of the motor.

[0067] Impeller 1 is made of conductive metal, which is stainless steel or aluminum alloy.

[0068] In this embodiment, the conductive metal is stainless steel or aluminum alloy, resulting in good conductivity. Conversely, the presence of non-metallic materials or coatings may block eddy current paths, affecting the cleaning effect.

[0069] In this embodiment, as a preferred configuration, coil 2 is an electromagnetic coil.

[0070] In this embodiment, coil 2 is an electromagnetic coil to increase the strength and range of the magnetic field it generates, thereby improving the efficiency of the impeller 1 in generating current.

[0071] Compared to traditional water-based heating and thermal radiation degreasing technologies, the self-cleaning technology proposed in this embodiment requires no additional water circuit design, completely eliminating the risk of water leakage, and also eliminating the need for consumables such as resistance wires. The system has a significantly improved level of automation, eliminating the need for water addition and drainage operations, effectively reducing safety hazards. Especially in hard-to-reach areas such as impeller gaps that are difficult to cover by high-temperature water-based cleaning technologies, this solution can still efficiently complete the cleaning task.

[0072] This embodiment also has the following advantages:

[0073] 1. The impeller 1 direct heating technology is adopted, which significantly improves thermal efficiency, reduces energy consumption, and does not require external heat source support;

[0074] 2. Impeller 1 is made of highly conductive material and combined with an external electromagnetic shielding layer to effectively eliminate magnetic field interference and ensure stable operation of the equipment;

[0075] 3. Completely eliminate water system design to avoid the risk of water leakage; simplify operation procedures and reduce safety hazards;

[0076] 4. The magnetic field parameters are intelligently adjusted according to the air volume mode to optimize heating efficiency and enhance oil removal effect.

[0077] The self-cleaning range hood 100 can be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the self-cleaning range hood 100 to perform corresponding operations, thereby realizing the intelligent control of the self-cleaning range hood 100 and improving the user experience.

[0078] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0079] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A self-cleaning range hood, comprising an impeller, characterized in that, The impeller is made of a conductive material. The self-cleaning range hood also includes a coil, which is used to pass an alternating current to generate a changing magnetic field. The impeller is disposed in the magnetic field and can move in the magnetic field to cut the magnetic field. The strength of the magnetic field can be adjusted for different air volumes.

2. The self-cleaning range hood as described in claim 1, characterized in that, The self-cleaning range hood also includes a volute, and the impeller is installed inside the volute via a rotating shaft and a mounting bracket. The impeller is sleeved on the rotating shaft, and the rotating shaft is mounted on the mounting bracket. Wherein, along the axial direction of the rotating shaft or along the axial direction parallel to the rotating shaft, the side of the impeller closer to the mounting bracket is the proximal side, and the side farther from the mounting bracket is the distal side; The coil is mounted on the proximal side and / or the distal side.

3. The self-cleaning range hood as described in claim 2, characterized in that, The coil is mounted on the proximal side and is disposed on the mounting bracket.

4. The self-cleaning range hood as described in claim 3, characterized in that, The coils are arranged in a ring along the rotational trajectory of the impeller.

5. The self-cleaning range hood as described in claim 3, characterized in that, The proximal end is the side away from the user, and the distance between the coil and the end of the impeller blade closest to the user is 10-15cm.

6. The self-cleaning range hood as described in claim 1, characterized in that, The alternating current is provided by a frequency converter so that the current frequency and the strength of the magnetic field are adjustable.

7. The self-cleaning range hood as described in claim 6, characterized in that, The frequency of the current is in the range of 50Hz-500Hz, and the strength of the magnetic field is in the range of 0.1T-1T. And / or, the self-cleaning range hood further includes a temperature safety valve and a temperature sensor, the temperature sensor being disposed on the impeller and used to detect the temperature of the impeller; The temperature safety valve is configured to disconnect the power supply to the coil from the frequency converter when the temperature detected by the temperature sensor exceeds 200°C.

8. The self-cleaning range hood as described in claim 6, characterized in that, The self-cleaning range hood also includes a volute, inside which a motor is installed to drive the impeller to rotate; An electromagnetic shielding structure is provided on the surface of the motor or on the exterior of the motor.

9. The self-cleaning range hood as described in claim 1, characterized in that, The impeller is made of a conductive metal, which is stainless steel or aluminum alloy.

10. The self-cleaning range hood according to any one of claims 1-9, characterized in that, The coil is an electromagnetic coil.

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