A range hood and control method

Abstract

The application discloses a kind of range hood, including shell, which is provided with air duct in the shell, the air duct is communicated suction port and exhaust port, and is provided with exhaust fan in air duct, exhaust port connects exhaust pipe, electric check valve is provided on the exhaust pipe, the electric check valve has the valve leaf that can be turned over, and the valve leaf receiving surface that can be attached with the edge of valve leaf, the edge of valve leaf is elastic material, valve leaf has the first state of being attached to valve leaf receiving surface, valve leaf has the second state with opening angle in the range of plus or minus 5 degrees;Range hood has the second state of the opening angle of the valve leaf of its electric check valve in the range of plus or minus 5 degrees, the second state opens exhaust fan to clean valve leaf and its receiving surface, by the second state of range hood, it can effectively prevent range hood under the use of day by day, the valve leaf of electric check valve and valve leaf receiving surface cover a layer of high viscosity dirt, can effectively avoid the problem that the valve leaf of electric check valve is closed and not opened.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of range hood, and particularly relates to a range hood and a control method. BACKGROUND

[0002] The check valve used in the range hood includes an ordinary check valve opened by the wind force of the range hood and an intelligent electric check valve opened by the motor drive. No matter which check valve, the oil fume accumulated day by day will cover a layer of high-viscosity oil dirt on the valve plate and the valve plate bearing surface. The ordinary check valve opened by the wind force of the range hood will cause the valve plate to be covered with oil stains, resulting in the problems of oil fume backflow due to the valve plate not being tightly closed and the self oil fume not being discharged due to the valve plate not being opened. The intelligent electric check valve will also be affected by the high-viscosity oil dirt covering the valve plate and the valve plate bearing surface, resulting in the problems of the valve plate not being tightly closed and the valve plate not being opened. SUMMARY

[0003] The present application aims to provide a range hood and a control method, which aims to improve the problem that the valve plate and the valve plate bearing surface are covered with a layer of high-viscosity oil dirt due to the oil fume accumulated day by day, resulting in the problems of the valve plate not being tightly closed and the valve plate not being opened.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a range hood is provided, which comprises a shell, a wind channel is arranged in the shell, the wind channel is communicated with an air inlet and an air outlet, a smoke exhaust fan is arranged in the wind channel, the air outlet is connected with a smoke exhaust pipe, an electric check valve is arranged on the smoke exhaust pipe, the electric check valve has a reversible valve plate and a valve plate bearing surface which can be attached to the edge of the valve plate, the edge of the valve plate is made of elastic material, the valve plate has a first state of being attached to the valve plate bearing surface, and the valve plate has a second state of an opening angle within the range of plus or minus 5 degrees.

[0005] Optionally, in the first state, the elastic material is in contact with the valve plate bearing surface, and the elastic material has elastic deformation; in the second state, there is a gap between the edge of the valve plate and the bearing surface, the gap is used for ventilation and oil guiding, and the third state is a cooking oil fume exhaust state.

[0006] Optionally, in the second state, the smoke exhaust fan is opened and exhausts air from the air outlet to the outside of the electric check valve.

[0007] According to the second aspect of the present application, a control method of a range hood is provided, the range hood has a control device and a timer, when the exhaust fan is turned off, the control device triggers the timer to count time, when the time exceeds a preset time T, the range hood enters a standby state, T is 20-36 hours; when the range hood is in the standby state, a condition of turning on the range hood is tracked, the control device controls the electric check valve to switch the valve plate to a second state, and the exhaust fan is turned on to run at a low speed for 10-30 minutes.

[0008] Optionally, the range hood further has a heating fan and a heating wire electrically connected to the control device, the wind blown by the heating fan is heated by the heating wire and then blown to the valve plate and the valve plate receiving surface of the electric check valve; when the control device controls the electric check valve to switch the valve plate to the second state, the control device first controls the heating fan and the heating wire to be started to blow hot wind to the valve plate and the valve plate receiving surface of the electric check valve, and the heating time is 1-3 minutes; after the heating is completed, the control device controls the exhaust fan to be turned on to run at a low speed for 10-30 minutes.

[0009] Optionally, the condition of turning on the range hood is that, after the timer reaches the preset time T, the timer is restarted, and the exhaust fan is started to run at a low speed when the exhaust fan is not turned on within a time of 1.5T.

[0010] Or

[0011] The condition of turning on the range hood is that the range hood enters a user away-from-home mode, or the range hood detects that a user is away from home.

[0012] Optionally, the range hood has a PM2.5 detection device, and the condition of turning on the range hood is that the PM2.5 detection device detects that the PM2.5 exceeds a threshold value, and then the exhaust fan is started to run at a low speed.

[0013] Optionally, when the exhaust fan is turned on, the timer is stopped; and after the exhaust fan is turned off, a new round of counting is started.

[0014] Optionally, the opening angle of the valve plate is repeatedly rotated from 5 degrees to 85 degrees; and when the angle of the valve plate is between 10 degrees and 70 degrees, the drive motor of the electric check valve is accelerated to increase the angular velocity of the valve plate; the drive motor of the electric check valve is heated before being accelerated; when the valve plate is opened and the opening angle of the valve plate reaches 5 degrees, the rotation speed of the drive motor of the electric check valve is reduced to 50-80% of the normal rotation speed.

[0015] Optionally, the receiving surface has a heating film, when the trigger condition is that the new timing time exceeds 1.5T, the heating film is first started to increase the temperature of the receiving surface and the edge of the valve plate, and the heating time is T1, wherein T1 is 0.5-5 minutes; when the trigger condition is that the detection value of PM2.5 exceeds the threshold value or the range hood enters the user's away mode, the trigger condition of the range hood is reached, the heating film is started to heat, and the heating time is T1, wherein T1 is 0.5-5 minutes.

[0016] The range hood provided by the application has a second state in which the opening angle of the valve plate of the electric check valve thereof is within the range of plus or minus 5 degrees, and in the second state, the exhaust fan is started to clean the valve plate and the receiving surface thereof. Through the second state of the range hood, it can be effectively prevented that a layer of oil stain with high viscosity is covered on the valve plate and the receiving surface of the valve plate of the electric check valve due to the daily use of the range hood, and the problem that the valve plate of the electric check valve cannot be tightly closed or cannot be opened can be effectively avoided. Other advantages of the application are described in the subsequent specification. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a perspective view of the range hood of an embodiment of the application;

[0018] Figure 2 is a first electric control structure block diagram of the range hood in the embodiment of the application;

[0019] Figure 3 is a perspective view of the electric check valve of the embodiment of the application;

[0020] Figure 4 is a structure schematic view of the valve plate of the electric check valve in the embodiment of the application in the first state;

[0021] Figure 5 is a structure schematic view of the valve plate of the electric check valve in the embodiment of the application in the second state;

[0022] Figure 6 is a structure schematic view of the valve plate of the electric check valve in the embodiment of the application in the third state;

[0023] Figure 7 is a structure schematic view of the valve plate of the electric check valve in the embodiment of the application in the fourth state;

[0024] Figure 8 is a second electric control structure block diagram of the range hood in the embodiment of the application;

[0025] Figure 9 is a flow chart of the control method of the range hood in the embodiment of the application;

[0026] Figure 10is a third electric control structure block diagram of the range hood in the embodiment of the application.

[0027] Reference signs: 1, housing; 2, electric check valve; 21, valve body; 22, driving motor; 23, valve piece; 24, connecting flange; 25, circular ring groove structure; 26, receiving part; 3, coaming. DETAILED DESCRIPTION

[0028] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] The following will be further described in combination with the drawings and specific embodiments:

[0030] Embodiment 1, a range hood, as shown in Figure 1 and Figure 2As shown, including the shell 1, which is provided with the air duct, air duct communication suction port and exhaust port, and in the air duct is provided with exhaust fan, shell 1 on the narrow long suction port is provided with communication air duct suction port. Shell 1 is provided with the fence 3, the fence 3 surrounds part of the air duct and the air duct exhaust port. The air duct exhaust port is provided with electric check valve 2, the electric check valve 2 is provided with a circular ring groove structure 25 for installing the exhaust pipe away from the air duct exhaust port. The shell 1 has an electrical accommodation cavity, and the PM2.5 detection device accommodation cavity is provided in the electrical accommodation cavity. The PM2.5 detection device accommodation cavity is independent of the electrical accommodation cavity and is not communicated with the electrical accommodation cavity. The shell wall at the upper end of the PM2.5 detection device accommodation cavity is provided with air holes, and the PM2.5 detection device accommodation cavity can communicate with the atmosphere through the air holes. The electrical accommodation cavity is provided with a control device and a timer, and the PM2.5 detection device accommodation cavity is provided with a PM2.5 detection device. The exhaust fan, PM2.5 detection device and timer are electrically connected with the control device. The control device uses MCU chip, and the PM2.5 detection device is provided with an air fan. The external air can be sucked into the PM2.5 detection device accommodation cavity through the air holes, and the PM2.5 detection device can detect the PM2.5 of the external air. When the PM2.5 of the external air exceeds the set value, the PM2.5 detection device will send a signal to the MCU chip of the range hood, and the MCU chip will control the gear of the exhaust fan after receiving the signal sent by the PM2.5 detection device. In this way, the range hood is more intelligent. When the cooking personnel's hands are contaminated with more oil stains, it is not convenient to directly adjust the gear of the exhaust fan with hands, and when the gear of the exhaust fan is low, the oil smoke will escape or scatter more. The escaping oil smoke will be detected by the PM2.5 detection device, and the PM2.5 detection device will send a signal to the MCU chip, and the MCU chip will automatically control the gear of the exhaust fan. Therefore, the PM2.5 detection device can automatically detect whether the PM2.5 content in the external air exceeds the standard, and automatically adjust the gear of the exhaust fan when the PM2.5 content in the external air exceeds the standard, which effectively improves the practicality, intelligence and environmental protection of the range hood.

[0031] As Figure 3 and Figure 4As shown, the electric check valve 2 includes a valve body 21, a drive motor 22 and a valve plate 23, the lower end of the valve body 21 is provided with a connecting flange 24 for mounting the electric check valve on the range hood body, the upper end of the valve body 21 is provided with a circular ring groove structure 25 for connecting the exhaust hood pipe, the inner wall of the valve body 21 is provided with a receiving part 26 for receiving the valve plate 23, the valve plate 23 is closed, and the surface of the receiving part 26 in contact with the valve plate 23 is the valve plate receiving surface. The drive motor 22 is installed on the outer wall of the valve body 21, the valve plate 23 is rotatably installed inside the valve body 21 and connected with the drive motor 22, the drive motor 22 can drive the valve plate 23 to flip. The edge of the valve plate 23 is made of elastic material, when the valve plate 23 is closed, the elastic material of the edge of the valve plate 23 is pressed to produce elastic deformation, which can effectively improve the sealing effect, that is, improve the closing effect of the electric check valve 2. As shown in Figure 2 As shown, the electric check valve 2 is electrically connected with the MCU chip of the range hood, and the operation of the electric check valve 2 is controlled by the MCU chip. During cooking, the MCU chip first controls the electric check valve 2 to open, and then controls the exhaust fan to start, or the MCU chip controls the electric check valve 2 to open at the same time as controlling the exhaust fan to start. When the range hood is turned off, the MCU chip first controls the exhaust fan to stop, and then controls the electric check valve 2 to close.

[0032] In this embodiment, the range hood has three states, namely the first state, the second state and the third state, and the valve plate 23 of the electric check valve 2 also has three states, namely the first state, the second state and the third state. The three states of the range hood and the three states of the valve plate 23 correspond one by one. The first state of the valve plate 23 is that the opening angle of the valve plate 23 is 0 degree, as shown in Figure 4 At this time, the edge of the valve plate 23 adheres to the valve plate receiving surface of the receiving part 26, at this time the range hood is in the first state of stopping working, in this state, a seal is formed between the valve plate 23 and the valve plate receiving surface of the receiving part 26, which can effectively prevent the backflow of oil fume in the public flue. The second state of the valve plate 23 is that the opening angle of the valve plate 23 is within the range of plus or minus 5 degrees, as shown in Figure 5 At this time, there is a small gap between the edge of the valve plate 23 and the valve plate receiving surface, at this time the range hood is in the second state of cleaning the valve plate 23 and the valve plate receiving surface of the receiving part 26, in this state, the MCU chip of the range hood controls the exhaust fan to open, and exhausts air from the exhaust port to the outside of the electric check valve, the exhaust air passes through the gap between the edge of the valve plate 23 and the valve plate receiving surface, and at the same time blows and cleans the oil stains on the valve plate 23 and the valve plate receiving surface of the receiving part 26. The third state of the valve plate 23 is that the opening angle of the valve plate 23 is within the range of 85 degrees to 90 degrees, as shown in Figure 6 At this time, there is a large gap between the edge of the valve plate 23 and the valve plate receiving surface, which is suitable for exhausting oil fume, at this time the range hood is in the third state of cooking and exhausting oil fume.

[0033] As Figure 5 shown, the valve plate 23 can be divided into left half valve plate and right half valve plate, the receiving part 26 is divided into left half receiving part and right half receiving part, the left half receiving part is located at the lower side of the left half valve plate, the right half receiving part is located at the upper side of the right half valve plate, the upper end surface of the left half receiving part is the valve plate receiving surface, the lower end surface of the right half receiving part is the valve plate receiving surface. In the second state, the valve plate 23 is opened counterclockwise, and the opening angle is controlled within 5 degrees. The MCU chip of the range hood controls the opening of the exhaust fan. Since the gap between the edge of the valve plate 23 and the valve plate receiving surface is very small at this time, the wind speed will increase sharply when the exhaust air of the exhaust fan passes through the gap. The oil stains on the lower surface of the valve plate 23, especially the oil stains at the edge position of the lower end surface of the left half valve plate, can be effectively removed. The oil stains on the upper end surface of the left half receiving part can be effectively removed. The oil stains on the lower end surface of the right half receiving part can be effectively removed. The oil stains on the upper end surface of the right half valve plate, especially the oil stains at the edge position of the upper end surface of the right half valve plate, can be effectively removed. Therefore, the oil stains on the valve plate receiving surface of the receiving part 26 and the contact position between the valve plate 23 and the valve plate receiving surface can be effectively removed, that is, the position where the valve plate 23 contacts the receiving part 26 is free of oil stains, and the valve plate 23 and the receiving part 26 will not stick together, and the problem of affecting the rotation of the valve plate 23 will not occur. Therefore, through the second state of the range hood, it can effectively prevent the valve plate 23 of the electric check valve 2 from covering a layer of high-viscosity oil stains on the valve plate receiving surface, and effectively avoid the problem of the valve plate 23 of the electric check valve 2 being unable to close tightly and being unable to open.

[0034] Embodiment 3, a range hood, as Figure 1 shown and Figure 8As shown, including the shell 1, which is provided with the air duct, air duct communication suction and exhaust, and in the air duct is provided with exhaust fan, shell 1 is provided with the narrow and long suction port of the air duct suction port. Shell 1 is provided with the coaming 3, coaming 3 surrounds part of the air duct and the air duct exhaust. The air duct exhaust is provided with electric check valve 2, the end of electric check valve 2 away from the air duct exhaust is provided with a circular ring groove structure 25 for installing the exhaust pipe. Electric check valve 2 is located in the coaming 3, coaming 3 is also provided with heating fan and electric heating wire, the air duct wall of the part of the air duct surrounded by coaming 3 is provided with hot air through hole communicated with electric heating wire, the outside of hot air through hole has an inclined pipe arranged obliquely downward, the air blown by heating fan is heated by electric heating wire and then enters the air duct obliquely upward through the inclined pipe and the hot air through hole, and blows to the valve plate of electric check valve and the valve plate receiving surface. The hot air through hole is provided with a check valve for preventing oil fume from flowing back into the electric heating wire. The shell 1 has an electrical accommodation cavity, and the PM2.5 detection device accommodation cavity which is independent and not communicated with the electrical accommodation cavity is arranged in the electrical accommodation cavity. The shell wall at the upper end of the PM2.5 detection device accommodation cavity is provided with air permeable holes, and the PM2.5 detection device accommodation cavity is communicated with the atmosphere through the air permeable holes. The electrical accommodation cavity is provided with a control device and a timer, and the PM2.5 detection device is arranged in the PM2.5 detection device accommodation cavity. The exhaust fan, the heating fan, the electric heating wire, the PM2.5 detection device and the timer are electrically connected with the control device. The control device uses MCU chip, the PM2.5 detection device is provided with an air induction fan, which can suck the external air into the PM2.5 detection device accommodation cavity through the air permeable holes, the PM2.5 detection device detects the PM2.5 in the sucked external air, when the PM2.5 in the external air exceeds the set value, the PM2.5 detection device sends a signal to the MCU chip of the extractor hood, and the MCU chip automatically controls the gear of the exhaust fan after receiving the signal sent by the PM2.5 detection device. Therefore, the PM2.5 detection device can automatically detect whether the PM2.5 content in the external air exceeds the standard, and automatically adjust the gear of the exhaust fan when the PM2.5 content in the external air exceeds the standard, thereby improving the practicality, intelligence and environmental protection of the extractor hood.

[0035] Example 4: In this example, the range hood has four states: first state, second state, third state, and fourth state. The valve plate 23 of the electric check valve 2 also has four states: first state, second state, third state, and fourth state. The four states of the range hood correspond one-to-one with the four states of the valve plate 23. The first state of the valve plate 23 is when its opening angle is 0 degrees. Figure 4 As shown, at this time, the edge of the valve plate 23 is attached to the valve plate receiving surface of the receiving part 26. The range hood is in its first stopped state. In this state, a seal is formed between the valve plate 23 and the valve plate receiving surface of the receiving part 26, effectively preventing backflow of fumes from the common flue. The second state of the valve plate 23 is when the opening angle of the valve plate 23 is within ±5 degrees. Figure 5 As shown, there is a small gap between the edge of valve plate 23 and the valve plate receiving surface at this time. The range hood is in the second state of cleaning valve plate 23 and the valve plate receiving surface of the receiving part 26. In this state, the MCU chip of the range hood first controls the start of the heating fan and heating wire to blow hot air onto the valve plate 23 and the valve plate receiving surface of the receiving part 26, softening or melting the grease on these surfaces. After heating, the MCU chip of the range hood controls the exhaust fan to turn on and exhaust air from the exhaust port to the outside of the electric check valve. This exhaust air passes through the gap between the edge of valve plate 23 and the valve plate receiving surface, blowing away the grease on the valve plate receiving surface of the receiving part 26 and at the junction of valve plate 23 and the valve plate receiving surface. This method of softening the grease first and then cleaning with air can more effectively remove the grease from the valve plate receiving surface and the junction of valve plate 23 and the valve plate receiving surface. The third state of valve plate 23 is that the opening angle of valve plate 23 is within the range of 85 degrees to 90 degrees, such as... Figure 6 As shown, at this time, there is a large gap between the edge of valve plate 23 and the valve plate receiving surface, which is suitable for exhausting oil fumes. At this time, the range hood is in the third state of cooking fume extraction. The fourth state of valve plate 23 is when the opening angle of valve plate 23 is within the range of 5 degrees to 85 degrees, as shown... Figure 7As shown, in this state, the opening angle of valve plate 23 rotates repeatedly within the range of 5 degrees to 85 degrees. Within this range, the rotating shaft of drive motor 22 may become contaminated with oil and become blocked. Rotation can reduce oil adhesion between the rotating shaft and the shaft hole, thus reducing blockage. This state also includes an oil-slinging state where the drive motor 22 of electric check valve 2 accelerates to increase the angular velocity of valve plate 23. In the oil-slinging state, the opening angle of valve plate 23 is between 10 degrees and 70 degrees. Before the oil-slinging state begins, the MCU chip of the range hood first controls the start of the heating fan and heating wire to blow hot air onto valve plate 23 to soften or melt the oil on valve plate 23. After heating is complete, the MCU chip of the range hood controls the drive motor 22 of electric check valve 2 to accelerate to increase the angular velocity of valve plate 23. In the fourth state, when the range hood is turned on and the opening angle of the valve plate 23 reaches 5 degrees, the rotation speed of the drive motor 22 is reduced to 50-80% of its normal speed. This reduction in rotation speed within the 0-5 degree range increases the stall torque. In this fourth state, the range hood is in a state where the valve plate 23 accelerates oil removal.

[0036] Example 5, as Figure 2 and Figure 9 As shown, this embodiment provides a control method for a range hood. The range hood includes a control device and a timer, and the control device uses an MCU chip. The specific control method is as follows:

[0037] S100. When the exhaust fan is turned off, the control device triggers a timer. After the timer exceeds a preset time T, it enters a standby state, where T is between 20 and 36 hours. Specifically, T can be 20 hours, 26.5 hours, 29.4 hours, 33 hours, 35.1 hours, 36 hours, etc. The timer stops when the exhaust fan is turned on. A new timer begins after the exhaust fan is turned off.

[0038] S200. When in the standby state, the control device tracks and triggers the start-up conditions of the range hood, and controls the electric check valve 2 to switch the valve plate 23 to the second state.

[0039] S300: Turn on the exhaust fan and run it at low speed for 10-30 minutes. Specifically, the low speed running time of the exhaust fan can be 10 minutes, 12 minutes, 15 minutes, 19.5 minutes, 25 minutes, 28 minutes, 30 minutes, etc.

[0040] In some exemplary embodiments, the condition for triggering the smoke exhaust fan to start is that after the timer reaches a preset time T, the timer is restarted, and if the smoke exhaust fan does not start within a time period exceeding 1.5T, then the smoke exhaust fan is started and runs at low speed.

[0041] In some exemplary embodiments, the condition for triggering the range hood to start is that the range hood enters a user-away mode or the range hood detects that the user is away. Some families have smart homes, and the user-away mode is a common mode of the smart home, which is often provided by a home central controller, or an access control system, or a user voice command. The user-away mode is that the noise and vibration generated by the starting of the exhaust fan will not adversely affect the user.

[0042] In the above two exemplary embodiments, the problem that the valve plate 23 cannot be opened due to the mutual adhesion of oil stains at the contact position of the valve plate 23 and the valve plate receiving surface can be prevented when the range hood is not used for a long time.

[0043] In some exemplary embodiments, the range hood has a PM2.5 detection device, and the condition for triggering the range hood to start is that the PM2.5 detection device detects that the PM2.5 exceeds a threshold value, and then the exhaust fan is started to run at a low speed. In this way, air pollutants generated by household items in the home and air pollutants accidentally entering the home can be discharged.

[0044] Embodiment 6, as shown in Figure 8 and Figure 9 The present embodiment provides a control method for a range hood, which has a control device and a timer, and also has a heating fan and a heating wire electrically connected to the control device, and the control device is an MCU chip. The control method is as follows:

[0045] S100, when the exhaust fan is turned off, the control device triggers the timer to start timing, and when the timing exceeds a preset time T, the standby start state is entered, T is 20-36 hours, and specifically, T can be 20 hours, 26.5 hours, 29.4 hours, 33 hours, 35.1 hours, 36 hours, etc. When the exhaust fan is started, the timing is stopped. After the exhaust fan is turned off, a new round of timing starts.

[0046] S200, when in the standby start state, the condition for triggering the range hood to start is tracked, and the control device controls the electric check valve 2 to switch the valve plate 23 to the second state.

[0047] S300, the control device first controls the starting of the heating fan and the heating wire to blow hot air to heat the valve plate 23 and the valve plate receiving surface of the electric check valve 2, and after heating for 1-3 minutes, the control device controls the starting of the exhaust fan to run at a low speed for 10-30 minutes. Specifically, the running time of the exhaust fan at a low speed can be 10 minutes, 12 minutes, 15 minutes, 19.5 minutes, 25 minutes, 28 minutes, 30 minutes, etc.

[0048] The heating of the valve plate 23 and the valve plate receiving surface of the electric anti-backflow valve 2 can soften the oil stains on the valve plate 23 and the valve plate receiving surface, and the softened oil stains can be removed by blowing. The method of softening the oil stains first and then blowing to clean can more effectively remove the oil stains on the valve plate receiving surface and the edge position of the valve plate 23.

[0049] Embodiment 7, as shown in Figure 9 and Figure 10 The embodiment provides a control method of a range hood, the range hood has a control device and a timer, and further has a heating film electrically connected to the control device, the control device is an MCU chip, and the heating film covers the valve plate receiving surface of the electric anti-backflow valve 2. The control method specifically includes the following steps.

[0050] S100, when the smoke exhaust fan is turned off, the control device triggers the timer to start timing, and when the timing exceeds a preset time T, the range hood enters a standby start state, T is 20 hours-36 hours, specifically, T can be 20 hours, 26.5 hours, 29.4 hours, 33 hours, 35.1 hours, 36 hours, etc. When the smoke exhaust fan is turned on, the timing is stopped. After the smoke exhaust fan is turned off, a new round of timing starts.

[0051] S200, when in the standby start state, a smoke fan start condition is tracked and triggered, and the control device controls the electric anti-backflow valve 2 to switch the valve plate 23 to the second state.

[0052] S300, the smoke exhaust fan is started to run at a low wind speed for 10-30 minutes, specifically, the running time of the smoke exhaust fan at a low wind speed can be 10 minutes, 12 minutes, 15 minutes, 19.5 minutes, 25 minutes, 28 minutes, 30 minutes, etc.

[0053] In some exemplary embodiments, the range hood has a PM2.5 detection device, the triggering condition is that the detection value of the PM2.5 detection device exceeds a threshold value, and the control device controls the heating film to be powered on and started, and the heating film heats the valve plate receiving surface and the edge position of the valve plate 23 in contact with the valve plate receiving surface for 0.5-5 minutes.

[0054] In some exemplary embodiments, the triggering condition is that the range hood enters a user away-from-home mode, and the control device controls the heating film to be powered on and started, and the heating film heats the valve plate receiving surface and the edge position of the valve plate 23 in contact with the valve plate receiving surface for 0.5-5 minutes.

[0055] In the above two exemplary embodiments, the first heating can soften the oil stains on the valve plate receiving surface and the edge position of the valve plate 23, which can effectively avoid the problem that the valve plate receiving surface and the valve plate 23 are adhered to each other and cannot be opened, and can more effectively remove the oil stains on the valve plate receiving surface and the edge position of the valve plate 23.

[0056] The preferred embodiments of the present application have been described above with the intent to enable those skilled in the art to make and use it. Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Accordingly, the true scope of the present application is not limited to the embodiments described herein but is only limited to the scope of the claims together with the full range of equivalents to which such claims are entitled.

Claims

1. A control method of a range hood, the range hood comprising a housing, a duct arranged in the housing, the duct communicating with an air inlet and an air outlet, and a smoke exhaust fan arranged in the duct, the air outlet being connected to a smoke exhaust pipe, and a motorized check valve being arranged on the smoke exhaust pipe, the motorized check valve having a valve flap which can be turned, and a valve flap receiving surface which can be attached to the edge of the valve flap, the edge of the valve flap being made of elastic material, the valve flap having a first state of being attached to the valve flap receiving surface, and a second state of having an opening angle within a range of plus or minus 5 degrees, characterized in that: the opening angle of the valve flap is repeatedly turned from 5 degrees to 85 degrees, and when the opening angle of the valve flap is between 10 degrees and 70 degrees, the drive motor of the motorized check valve is accelerated to increase the angular velocity of the valve flap, the drive motor of the motorized check valve is heated before being accelerated, and when the valve flap is opened and the opening angle of the valve flap reaches 5 degrees, the rotation speed of the drive motor of the motorized check valve is reduced to 50-80% of the normal rotation speed.

2. The control method of the range hood according to claim 1, characterized in that: in the first state, the elastic material is in contact with the valve flap receiving surface, and the elastic material has elastic deformation, in the second state, there is a gap between the edge of the valve flap and the receiving surface, the gap being used for ventilation and oil guiding, and the third state is a cooking and oil fume exhausting state.

3. The control method of the range hood according to claim 2, characterized in that: in the second state, the smoke exhaust fan is turned on, and air is exhausted from the air outlet to the outside of the motorized check valve.

4. The control method of the range hood according to any one of claims 1-3, characterized in that: the range hood has a control device and a timer, when the smoke exhaust fan is turned off, the control device triggers the timer to count time, when the counted time exceeds a preset time T, a standby state is entered, T being 20 hours-36 hours, when the standby state is entered, a condition for triggering the range hood to be turned on is tracked, the control device controls the motorized check valve to switch the valve flap to the second state, and the smoke exhaust fan is turned on to run at a low speed for 10-30 minutes.

5. The control method of the range hood according to claim 4, characterized in that: the range hood further has a heating fan and a heating wire which are electrically connected to the control device, the air blown by the heating fan is heated by the heating wire, and then blown to the valve flap and the valve flap receiving surface of the motorized check valve, when the control device controls the motorized check valve to switch the valve flap to the second state, the control device first controls the heating fan and the heating wire to be started, hot air is blown to the valve flap and the valve flap receiving surface of the motorized check valve to heat, and the heating time is 1-3 minutes, after the heating is completed, the control device controls the smoke exhaust fan to be turned on to run at a low speed for 10-30 minutes.

6. The control method of the range hood according to claim 4, characterized in that: the condition for triggering the range hood to be turned on is that, after the timer reaches the preset time T, the timer is restarted, and if the smoke exhaust fan is not turned on within a time of 1.5T, the smoke exhaust fan is started to run at a low speed. ​ ​ ​ ​ ​ ​ ​ The trigger condition for starting the range hood is that the range hood enters a user-away mode or the range hood detects that a user is away.

7. The control method of claim 4, wherein the range hood has a PM2.5 detection device, and the trigger condition for starting the range hood is that the PM2.5 detection device detects that the PM2.5 exceeds a threshold value, and the exhaust fan is started to run at a low speed.

8. The control method of claim 4, wherein when the exhaust fan is started, the timing is stopped; and when the exhaust fan is stopped, a new round of timing is started.

9. The control method of any one of claims 5-8, wherein the receiving surface has a heating film, and when the trigger condition is that the new timing exceeds 1.5T, the heating film is first started to increase the temperature of the receiving surface and the edge of the valve sheet, and the heating time is T1, wherein T1 is 0.5-5 minutes; and when the trigger condition is that the detected value of the PM2.5 exceeds a threshold value or the range hood enters a user-away mode, the heating film is started to heat, and the heating time is T1, wherein T1 is 0.5-5 minutes. ​ ​ ​

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