Range hood and control method

Abstract

The invention belongs to the technical field of household appliances, and particularly relates to a range hood and a control method. The range hood comprises a fan frame and a fan structure arranged in the fan frame, the fan structure comprises a volute, a driver, an impeller and a heat conduction piece, the volute is provided with an air cavity, an air inlet and an air outlet which are both communicated with the air cavity are formed in the surface of the volute, the impeller is located in the air cavity, and the driver is connected with the volute and used for driving the impeller to rotate. Air flows into the air cavity from the air inlet and flows out of the air cavity from the air outlet; one end of the heat conduction piece makes contact with the heating end of the driver, and the other end of the heat conduction piece makes contact with the volute so that heat generated by the driver can be conducted to the volute through the heat conduction piece. According to the valve, heat of the driver can be conducted to the volute, and the energy-saving effect is achieved; and the temperature of the driver can be reduced, so that the stability of the performance of the driver is improved, and the service life of the driver is prolonged.

Description

Technical Field

[0001] The present invention belongs to the field of household electrical appliance technology equipment, and in particular relates to a range hood and a control method thereof. Background Art

[0002] At present, a large amount of oil will be deposited on the inner surface of the volute of the range hood during long-term use. In order to clean the oil, the traditional cleaning solution is to heat the volute through an electric heating film to increase the temperature of the volute, thereby softening the oil and allowing it to flow out.

[0003] However, in traditional cleaning solutions, on the one hand, the electric heating film itself is an additional energy consumption unit, and the electric heating film needs to consume additional electrical energy, resulting in an increase in the overall energy consumption of the range hood.

[0004] On the other hand, the motor of the range hood generates a large amount of heat during operation. The motor is fixed to the bottom plate of the volute by screws and shock-absorbing rubber pads. The shock-absorbing rubber pads have certain heat insulation and shock-absorbing effects, so that the heat emitted by the motor is mainly dissipated into the air in the form of thermal radiation, resulting in low heat dissipation efficiency of the motor, and leading to reduced working efficiency, performance degradation and shortened life of the motor. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a range hood, aiming to solve the problem of how to save energy and improve the life and working efficiency of the range hood.

[0006] To achieve the above objectives, the technical solution adopted in this application is:

[0007] 18. The fan assembly as claimed in claim 17, wherein the fan is mounted on a linking member and the linking member is connected to the chassis to form a circuitous bearing. The circuitous bearing comprises a first heat conducting portion and a second heat conducting portion connected to the chassis. The first heat conducting portion is arranged on the chassis to surround the fan and is used to conduct heat to the chassis. The second heat conducting portion is connected to the chassis to form a circuitous bearing.

[0008] In some embodiments, the first heat conducting portion is in a sleeve shape and covers the heat generating end of the driver.

[0009] In some embodiments, the first heat conducting portion is arranged in a spiral shape around the heat generating end of the driver.

[0010] In some embodiments, a heat-conducting groove is formed at the heat-generating end of the driver, the shape of the heat-conducting groove extension path is adapted to the shape of the first heat-conducting portion, and the first heat-conducting portion is at least partially located in the heat-conducting groove.

[0011] In some embodiments, the second heat conducting portion includes a connecting segment and a flat segment, the flat segment is arranged around the circumference of the volute, and the connecting segment connects the first heat conducting portion and the flat segment.

[0012] In some embodiments, the heat conducting element is a hollow structure, and is filled with a heat conducting agent.

[0013] In some embodiments, the range hood further includes an electric heating film connected to the outer surface of the volute.

[0014] In some embodiments, the volute includes two spaced-apart cover plates and an arc-shaped enclosure connected between the two cover plates. The two cover plates and the arc-shaped enclosure together form the wind cavity and the air outlet. The driver is installed on one of the cover plates, and the other cover plate is provided with the air inlet. The heat conductor is connected to the arc-shaped enclosure.

[0015] In a second aspect, a control method is provided for controlling the range hood, the control method comprising the following steps:

[0016] S1: Obtain the rotation speed v1 of the driver, the current temperature T1 of the volute, and the duration t1 of the temperature T1;

[0017] S2: Determine whether the range hood can enter the self-cleaning mode. If the determination result is no, the range hood does not enter the self-cleaning mode. If the determination result is yes, execute step S3;

[0018] S3: starting the electric heating film to heat the volute to a temperature T2 and keep it warm for a first holding time of t2;

[0019] S4: increasing the rotation speed of the driver to v2, where v2 is greater than v1, and obtaining the operating time t3 of the driver operating at the rotation speed v2;

[0020] S5: Determine whether the t3 satisfies a preset value. If the determination result is yes, turn off the range hood. If the determination result is no, execute step S3.

[0021] In some embodiments, the temperature T1 ranges from 50 to 60 degrees Celsius, and the temperature T2 ranges from 80 to 85 degrees Celsius.

[0022] The beneficial effects of this application are: the heat generated by the driver is conducted to the volute through the heat conductor, and on the one hand, the heat of the driver itself is used to heat the volute to soften and remove oil stains, thereby avoiding the consumption of additional electricity and achieving energy saving; on the other hand, the heat conductor can improve the heat dissipation efficiency of the driver, reduce the driver temperature, thereby improving the driver's working efficiency, stabilizing the driver's performance, and increasing the driver's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 1 is a schematic diagram of the three-dimensional structure of the fan structure of the range hood provided in an embodiment of the present application;

[0025] Figure 2 is a schematic three-dimensional structural diagram of a fan structure of a range hood provided by another embodiment of the present application;

[0026] Figure 3 yes Figure 2 A cross-sectional schematic diagram of a fan structure;

[0027] Figure 4 yes Figure 2 A schematic diagram of the three-dimensional structure of the heat conducting member of the fan structure;

[0028] Figure 5 yes Figure 2 Schematic diagram of the three-dimensional structure of the electric heating film of the fan structure;

[0029] Figure 6 This is a schematic diagram of the self-cleaning process of a range hood provided in another embodiment of the present application.

[0030] Among them, the reference numerals in the figures are:

[0031] 100. Fan structure; 10. Volute; 11. Air inlet; 12. Air outlet; 13. Air cavity; 14. Cover plate; 15. Arc-shaped enclosure; 40. Electric heating film; 30. Heat-conducting element; 20. Impeller; 31. First heat-conducting part; 321. Connecting section; 322. Flat section; 32. Second heat-conducting part; 50. Driver. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit this application.

[0033] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first" and "second" are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0034] See also Figures 1 to 3 , an embodiment of the present application provides a range hood and a control method for controlling the range hood, wherein the range hood can generate negative pressure to extract smoke oil.

[0035] The range hood includes a fan frame and a fan structure 100 disposed within the fan frame. The fan structure 100 includes a volute 10, a driver 50, an impeller 20, and a heat conductor 30. The volute 10 has an air cavity 13. An air inlet 11 and an air outlet 12 are formed on a surface of the volute 10, both communicating with the air cavity 13. It is understood that the air inlet 11 and the air outlet 12 can be located on two different surfaces of the volute 10. Air can flow into the air cavity 13 from the air inlet 11 and flow out of the air cavity 13 from the air outlet 12. Of course, smoke oil mixed in the air can flow into the air cavity 13 along with the air and then flow out of the air cavity 13 through the air outlet 12.

[0036] See also Figures 1 to 3 The impeller 20 is located in the air cavity 13 and is rotatably connected to the inner wall of the air cavity 13 and can rotate under external force. The driver 50 is connected to the volute 10 and is used to drive the impeller 20 to rotate, so that air flows into the air cavity 13 from the air inlet 11 and flows out of the air cavity 13 at the air outlet 12; that is, the driver 50 is used to provide rotational power to the impeller 20 to rotate the impeller 20.

[0037] See also Figures 1 to 3One end of the heat conductor 30 contacts the heat-generating end of the driver 50, and the other end of the heat conductor 30 contacts the volute 10, so that the heat generated by the driver 50 is transferred to the volute 10 through the heat conductor 30. It is understood that the heat conductor 30 is made of a thermally conductive material with good thermal conductivity. Through the heat conductor 30, the heat generated by the driver 50 can be transferred to the volute 10, thereby heating the volute 10 and softening the oil stains adhered to the inner wall of the air cavity 13, so that the oil stains can be discharged from the air cavity 13. At the same time, the heat dissipation effect of the driver 50 can be improved, so that the driver 50 maintains a lower operating temperature, and the operating efficiency and reliability of the driver 50 are improved.

[0038] See also Figures 1 to 3 In the embodiment of the present application, the heat generated by the driver 50 is transferred to the volute 10 through the heat conductor 30. On the one hand, the heat of the driver 50 itself is used to heat the volute 10 to soften and remove oil stains, thereby avoiding the consumption of additional electricity and achieving energy saving. On the other hand, the heat conductor 30 can improve the heat dissipation efficiency of the driver 50, reduce the temperature of the driver 50, thereby improving the working efficiency of the driver 50, stabilizing the performance of the driver 50, and increasing the service life of the driver 50.

[0039] See also Figures 1 to 3 Alternatively, the heat conductor 30 can be made of copper. Copper has excellent thermal conductivity, primarily due to the high concentration of free electrons within copper. This allows electrons to efficiently transfer heat energy as they migrate within the crystal lattice, thereby rapidly dissipating heat. Compared to common metals such as iron, stainless steel, and aluminum, copper not only has a higher thermal conductivity but also excellent thermal stability, maintaining high thermal conductivity over a wide temperature range. Furthermore, copper is abundant and inexpensive.

[0040] See also Figures 1 to 3 Optionally, the driver 50 is a motor mounted on the outer surface of the volute 10, with a shock-absorbing pad positioned between the motor and the volute 10. The motor drives the impeller 20 to rotate at high speed, creating negative pressure to extract and discharge the oil smoke. The motor is also resistant to oil and high temperatures, has low noise, and is highly stable.

[0041] Optionally, the material of the motor housing is metal or plastic, which is not limited here and can be selected according to actual conditions. The heat conducting member 30 can reduce the winding resistance of the motor, thereby improving the service life and working efficiency of the motor.

[0042] See also Figures 1 to 3In some embodiments, the heat conducting member 30 includes a first heat conducting portion 31 and a second heat conducting portion 32 connected to the first heat conducting portion 31 , the first heat conducting portion 31 is arranged around the heating end of the driver 50 , and one end of the second heat conducting portion 32 is arranged along the circumference of the volute 10 .

[0043] See also Figures 1 to 3 Optionally, the first heat conducting portion 31 is disposed around the heat generating end of the driver 50 to increase the contact area between the heat conducting member 30 and the heat generating end, thereby transferring the heat generated by the driver 50 to the first heat conducting portion 31 as much as possible. The second heat conducting portion 32 is arranged along the circumference of the volute 10 to evenly transfer heat to the volute 10, thereby uniformly heating the entire volute 10. This not only improves the efficiency of heat conduction, but also evenly distributes heat on the volute 10, enhancing the softening and cleaning effects on oil stains.

[0044] See also Figures 1 to 3 In some embodiments, the first heat conducting portion 31 is in a sleeve shape and covers the heating end of the driver 50 .

[0045] Optionally, the first heat-conducting part 31 can be a heat-conducting sleeve made of metal copper, which is wrapped around the heating end of the driver 50, and there can be thermal grease or thermal paste between the heat-conducting sleeve and the heating end of the driver 50 to ensure close contact with the heating end, increase the heat exchange area, and improve the heat conduction rate, so as to more effectively transfer the heat of the driver 50 to the volute 10.

[0046] See also Figures 1 to 3 In some embodiments, the first heat conducting portion 31 is arranged in a spiral shape around the heat generating end of the driver 50 .

[0047] Optionally, the first heat conducting part 31 can be made of a metal copper wire, processed by sheet metal technology, and arranged in a spiral shape around the heating end of the driver 50, extending the heat contact path and increasing the heat exchange surface, thereby enhancing the heat conduction capacity, thereby more efficiently conducting the heat of the driver 50 to the volute 10, and improving the overall heating and heat dissipation effects.

[0048] See also Figures 1 to 3 In some embodiments, a heat-conducting groove is provided at the heating end of the driver 50 , and the shape of the heat-conducting groove extension path is adapted to the shape of the first heat-conducting portion 31 , and the first heat-conducting portion 31 is at least partially located in the heat-conducting groove.

[0049] See also Figures 1 to 3Optionally, the heat conduction groove is located on the outer surface of the heating end. The heat conduction groove can increase the contact area between the driver 50 and the first heat conduction part 31, and the heat conduction groove can also realize the positioning and fixation of the first heat conduction part 31. During the operation and vibration of the motor, the first heat conduction part 31 and the heating end of the driver 50 can always maintain good contact, thereby improving the stability and effectiveness of heat conduction.

[0050] See also Figures 1 to 3 In some embodiments, the second heat-conducting portion 32 includes a connecting section 321 and a flat section 322. The flat section 322 is arranged around the circumference of the volute 10, and the connecting section 321 connects the first heat-conducting portion 31 and the flat section 322. That is, the two ends of the connecting section 321 are respectively connected to the first heat-conducting portion 31 and the flat section 322, so that heat from the first heat-conducting portion 31 can be transferred to the flat section 322 through the connecting section 321.

[0051] Optionally, the flat section 322 is flat as a whole, for example, the flat section 322 has a length of 800 mm, a width of 10 mm, and a thickness of 3 mm.

[0052] See also Figures 1 to 3 Optionally, the surface determined in the length and width directions of the flat section 322 fits the side surface of the volute 10, so that the flat section 322 maintains a sufficient contact area with the volute 10, improves the heat conduction efficiency and allows the heat to be evenly conducted to the volute 10, and can make the heat evenly distributed, thereby improving the heating effect of the volute 10 and enhancing the softening efficiency of the oil.

[0053] It is understandable that the flat section 322 can be fixed to the volute 10 by screws or riveting.

[0054] See also Figures 1 to 3 In some embodiments, the heat conducting member 30 is hollow and filled with a heat conducting agent. The heat conducting agent may be water or alcohol.

[0055] Optionally, the heat conductor 30 is hollow and filled with a heat conductor, utilizing the convection and heat conduction properties of the liquid to enhance the heat transfer rate, so that the heat of the driver 50 is transferred to the volute 10 more quickly, achieving higher energy-saving efficiency and heat dissipation performance of the driver 50.

[0056] See also Figures 2 to 4 Optionally, the first heat conducting portion 31 and the second heat conducting portion 32 are made of hollow copper tubes, and are filled with water or alcohol. When the range hood is operating normally, the motor temperature is less than or equal to 85°C. At room temperature, the maximum motor temperature is approximately 110°C. The boiling point of the heat conducting agent meets the heat conduction requirements, allowing for easy convection and heat conduction within the first heat conducting portion 31 and the second heat conducting portion 32.

[0057] Optionally, the heat conducting agent in the first heat conducting part 31 and the second heat conducting part 32 can circulate under the driving of an external force, thereby effectively conducting the heat of the driver 50 to the volute 10 .

[0058] See also Figures 4 and 5 In some embodiments, the range hood further includes an electric heating film 40 , which is connected to the outer surface of the volute 10 .

[0059] Optionally, the electric heating film 40 is flexible, allowing it to bend and conform to the outer surface of the volute 10. The electric heating film 40 acts as an auxiliary heating means, combining with the heat conduction of the heat conductive element 30 to improve the temperature rise efficiency of the volute 10 and enhance the oil cleaning effect. It is understood that the electric heating film 40 and the heat conductive element 30 can heat the volute 10 simultaneously, increasing the temperature rise rate of the volute 10.

[0060] See also Figures 4 and 5 Optionally, the electric heating film 40 can be bonded to the outside of the volute 10 by double-sided tape. The length of the electric heating film 40 is 900 mm, the width is 100 mm, the heating resistance is 140 ohms, and the power is 120 W.

[0061] Optionally, a temperature sensor is further provided on the volute 10, and the temperature sensor is used to detect the temperature of the volute 10. The temperature sensor may be a planar temperature sensor, and the temperature sensor may be fixed or riveted to the volute 10 by a fixing bracket or screws.

[0062] See also Figures 1 to 3 In some embodiments, the volute 10 includes two spaced-apart cover plates 14 and an arc-shaped enclosure 15 connected between the two cover plates 14 . The two cover plates 14 and the arc-shaped enclosure 15 together form the air cavity 13 and the air outlet 12 . The driver 50 is installed on one of the cover plates 14 , and the other cover plate 14 is provided with the air inlet 11 . The heat conductor 30 is connected to the arc-shaped enclosure 15 .

[0063] See also Figures 1 to 3 Optionally, an air inlet 11 is provided on one of the cover plates 14, so that the fan structure 100 is in a single air inlet mode. Alternatively, air inlets 11 may be provided on both cover plates 14, so that the fan structure 100 can achieve a front-to-back dual air inlet mode.

[0064] The range hood of the present application can adopt the heat conduction mode of the electric heating film 40 for heating and the heat conducting member 30, and can utilize the heat generated during the operation of the motor itself, which can not only reduce the temperature rise of the motor, but also reduce the power consumption of the electric heating film 40, thereby achieving the purpose of energy saving and increasing the service life of the motor.

[0065] See also Figures 1 to 3 , combined with the above structure, the working process of the range hood is explained below:

[0066] When the range hood is operating normally, the temperature of the motor is transferred to the volute 10, thereby increasing the temperature of the arc-shaped enclosure 15 of the volute 10. The temperature sensor identifies the current temperature and duration of the volute 10. When the range hood ends normal operation, the controller determines whether to enable self-cleaning. If the user has set it to be intelligently enabled, self-cleaning is enabled. If the user has set it not to be enabled, a message will be displayed indicating that the cleaning state is currently available. When the self-cleaning function is intelligently enabled, the electric heating film 40 only needs to increase the temperature of the volute 10 by a certain value based on the heating of the heat conductor 30, thereby effectively reducing the power-on time of the electric heating film 40 and reducing the power consumption of the electric heating film 40.

[0067] The method for judging whether cleaning is completed is to judge by the temperature duration, which avoids the situation where the cleaning efficiency of the fixed time program decreases in winter and electricity is wasted in summer.

[0068] The range hood can also actively turn on the self-cleaning function (when the range hood is not working properly and is in a cold state). When the electric heating film 40 completes the first working cycle, the heat generated by the rotation of the motor will also be added to the subsequent cleaning cycle, effectively reducing the working time of the subsequent working cycle of the electric heating film 40 and reducing power consumption.

[0069] See also Figure 6 The present invention also proposes a control method for controlling a range hood. The specific structure of the range hood refers to the above embodiment. Since this control method adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0070] See also Figure 6 , the control method comprises the following steps:

[0071] S1: Obtain the rotation speed v1 of the driver 50, the current temperature T1 of the volute 10, and the duration t1 of the temperature T1;

[0072] S2: Determine whether the range hood can enter the self-cleaning mode. If the determination result is no, the range hood does not enter the self-cleaning mode. If the determination result is yes, execute step S3;

[0073] S3: starting the electric heating film 40 to heat the volute 10 to a temperature T2 and keeping the temperature therein. The first holding time is t2.

[0074] S4: Increase the rotation speed of the driver 50 to v2, where v2 is greater than v1, and obtain the operating time t3 of the driver 50 operating at the rotation speed v2;

[0075] S5: Determine whether the t3 satisfies a preset value. If the determination result is yes, turn off the range hood. If the determination result is no, execute step S3.

[0076] See also Figure 6 , it can be understood that, when the range hood is working normally, the temperature of the motor will be transferred to the volute 10 and heat the arc-shaped enclosing plate 15 of the volute 10 to increase the temperature of the arc-shaped enclosing plate 15. The current temperature T1 of the volute 10 can be obtained by the temperature sensor, and the duration t1 of the temperature T1 can be obtained by the timer. After the range hood is working normally;

[0077] See also Figure 6 , determine whether the range hood can turn on the self-cleaning mode. If the user sets it to be able to turn on automatically, then it enters the self-cleaning mode; if the user sets it not to be turned on, the display screen of the range hood can display a reminder that it can enter the cleaning state, and the range hood executes the current process, such as continuing to maintain the smoking mode, or maintaining the cooling mode.

[0078] See also Figure 6 When the self-cleaning mode is activated, the electric heating film 40 begins heating the volute 10. The electric heating film 40 only needs to raise the cleaning temperature by the difference between T2 and T1, effectively reducing the power-on time of the electric heating film 40 and lowering power consumption. By maintaining the temperature at T2 for t2, the volute 10 is fully heated, softening the oil stains on it.

[0079] By increasing the rotation speed of the motor, the oil on the impeller 20 is separated from the impeller 20 under the action of centrifugal force. Among them, v1 can be 1400 rpm and v2 can be 3600 rpm.

[0080] The motor maintains the speed v2 for a time t3, and the temperature of the volute 10 is maintained at T2, so that the oil stains are completely cleaned. When the time t3 reaches the preset value, the range hood self-cleaning is completed and the range hood automatically shuts off. Among them, t1 is 15 minutes, t2 is 4 minutes, and t3 is 20 minutes.

[0081] Optionally, the control method of the present application avoids the fixed time program of the traditional scheme by judging the temperature duration, which leads to reduced cleaning efficiency in winter and waste of electricity in summer.

[0082] The present application provides that the range hood can also actively turn on the self-cleaning mode (the range hood is not working normally and is in a cold state). After the electric heating film 40 completes the heating of the volute 10 to the T2 temperature, the heat generated by the high-speed rotation of the motor will also be added to the subsequent cleaning cycle, effectively reducing the working time of the subsequent electric heating film 40 working cycle and reducing power consumption.

[0083] In some embodiments, the temperature T1 ranges from 50 to 60 degrees Celsius, and the temperature T2 ranges from 80 to 85 degrees Celsius.

[0084] The above are merely optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A range hood, characterized in that: include:

19. The fan frame as claimed in claim 18, wherein the fan structure comprises a volute, a driver, an impeller and a heat conductor, the volute having an air cavity, an air inlet and an air outlet both connected to the air cavity being opened on the surface of the volute, the impeller being located in the air cavity, the driver being connected to the volute and being used to drive the impeller to rotate, wherein air flows from the air inlet into the air cavity and flows out of the air cavity at the air outlet; one end of the heat conductor is in contact with the heating end of the driver, and the other end of the heat conductor is in contact with the volute, so that the heat generated by the driver is conducted to the volute through the heat conductor; the heat conductor comprises a first heat conducting part and a second heat conducting part connected to the first heat conducting part, the first heat conducting part being arranged around the heating end of the driver, and one end of the second heat conducting part being arranged along the circumference of the volute.

2. The range hood according to claim 1, wherein: The first heat conducting portion is in a sleeve shape and covers the heat-generating end of the driver.

3. The range hood according to claim 1, wherein: The first heat conducting portion is arranged in a spiral shape around the heat generating end of the driver.

4. The range hood according to claim 3, wherein: A heat-conducting groove is formed at the heat-generating end of the driver. The shape of the extension path of the heat-conducting groove matches the shape of the first heat-conducting portion. The first heat-conducting portion is at least partially located in the heat-conducting groove.

5. The range hood according to any one of claims 1 to 4, characterized in that: The second heat conducting portion includes a connecting section and a flat section. The flat section is arranged around the circumference of the volute. The connecting section connects the first heat conducting portion and the flat section.

6. The range hood according to any one of claims 1 to 4, characterized in that: The heat conducting member is a hollow structure and is filled with a heat conducting agent.

7. The range hood according to any one of claims 1 to 4, characterized in that: The range hood further comprises an electric heating film, which is connected to the outer surface of the volute.

8. The range hood according to any one of claims 1 to 4, characterized in that: The volute includes two spaced-apart cover plates and an arc-shaped enclosure connected between the two cover plates. The two cover plates and the arc-shaped enclosure together form the air cavity and the air outlet. The driver is installed on one of the cover plates, and the other cover plate is provided with the air inlet. The heat conductor is connected to the arc-shaped enclosure.

9. A control method for controlling the range hood according to claim 7, characterized in that: The control method comprises the following steps: S1: Obtain the rotation speed v1 of the driver, the current temperature T1 of the volute, and the duration t1 of the temperature T1; S2: Determine whether the range hood can enter the self-cleaning mode. If the determination result is no, the range hood does not enter the self-cleaning mode. If the determination result is yes, execute step S3; S3: starting the electric heating film to heat the volute to a temperature T2 and keep it warm for a first holding time of t2; S4: increasing the rotation speed of the driver to v2, where v2 is greater than v1, and obtaining the operating time t3 of the driver operating at the rotation speed v2; S5: Determine whether the t3 satisfies a preset value. If the determination result is yes, turn off the range hood. If the determination result is no, execute step S3.

10. The control method according to claim 9, wherein: The temperature T1 ranges from 50 to 60 degrees Celsius, and the temperature T2 ranges from 80 to 85 degrees Celsius.

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