Control method for preventing smoke from escaping from a range hood

Abstract

This invention relates to a control method for preventing smoke escape from a range hood, comprising the following steps: After the range hood is started, the current cooking status information is acquired, and then the smoke baffle is opened to a suitable opening angle range according to the acquired current cooking status information. When the smoke baffle is in the first opening angle range, the smoke baffle is rotated along the opening direction by the smoke baffle driving device so that the first side of the smoke baffle contacts the panel. When the smoke baffle is in the second opening angle range, the panel contacts the first side of the smoke baffle by a combination of the panel driving device moving the panel and the smoke baffle rotating. When the smoke baffle is in the third opening angle range, the panel driving device moves the panel until it contacts the first side of the smoke baffle. The advantage is that it solves the problem of smoke escape from the gap on the first side of the smoke baffle, and also ensures that the deflection angle of the smoke baffle is adapted to the actual cooking conditions.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a control method for preventing smoke escape from a range hood. Background Technology

[0002] Based on the distribution of the smoke inlets and their overall appearance, range hoods are mainly divided into top-mounted range hoods and side-mounted range hoods. Top-mounted range hoods have their smoke inlets located directly above the cooktop. As the fumes rise and approach the inlet, they are quickly sucked in. These hoods are generally quite deep, and because the panel is close to the user's forehead, there is often a problem of bumping one's forehead. Side-mounted range hoods have their smoke inlets located diagonally above the cooktop. Because the inlets are closer to the cooktop, the fumes are quickly sucked in as soon as they begin to rise. These hoods usually have a rotating smoke-collecting flap; once the flap is turned on, the fumes are extracted, and when the range hood is turned off, the flap automatically closes. For example, Chinese utility model patent application CN202220760103.8 (authorization announcement number: CN217635799U) discloses a side-suction range hood. This type of range hood has the following problems: because the flap is hinged to the range hood casing, a gap is left between the hinge and the casing to prevent jamming during rotation. When the range hood is first turned off, there is still grease inside the hood and in the duct, and the gap between the hinge and the casing easily causes residual grease to overflow. Some products use chamfered glass panels or an aluminum strip between the baffle and adjacent glass panels to adjust the gap, but this wastes costs and disrupts the overall aesthetic of the panel.

[0003] One method to reduce the gap is to increase the opening angle of the smoke baffle. However, this introduces several problems: as the opening angle increases, there is a risk of smoke escaping from the front of the baffle; the negative pressure zone shifts upward, reducing the smoke extraction effect and exacerbating smoke escape; and it also obstructs the user's view while cooking. Therefore, how to adapt and control the deflection angle of the smoke baffle according to actual cooking conditions has become a pressing technical problem for those in this field. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a control method for preventing smoke from escaping from a range hood, which can adapt and control the deflection angle of the smoke baffle according to the actual cooking conditions, in light of the current state of the technology.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a control method for preventing smoke escape in a range hood, the range hood including a casing and a smoke baffle, an air inlet is provided on the front side wall of the casing and a panel is provided in the area above the air inlet, the smoke baffle is driven by a smoke baffle driving device and can be rotatably mounted on the casing around a first axis extending left and right, and can open and close the air inlet, the smoke baffle has a first side adjacent to the first axis and a second side away from the first axis, the panel is driven by a panel driving device and can move closer to or away from the first side of the smoke baffle when it is in the open state, including the following steps: After the range hood is turned on, it acquires the current cooking status information and divides the cooking status into three cooking modes according to the intensity of the cooking process: a first cooking mode, a second cooking mode, and a third cooking mode. The intensity of the cooking process increases sequentially from the first cooking mode to the third cooking mode. Then, based on the acquired current cooking status information, the smoke baffle opens to a suitable opening angle range. The opening angle range of the smoke baffle includes a first opening angle range corresponding to the first cooking mode, a second opening angle range corresponding to the second cooking mode, and a third opening angle range corresponding to the third cooking mode. The first opening angle range, the second opening angle range, and the third opening angle range increase sequentially. When the smoke baffle is in the first opening angle range, the smoke baffle is rotated along the opening direction by the smoke baffle drive device, so that the first side of the smoke baffle contacts the panel. When the smoke baffle is in the second opening angle range, the panel is moved by the panel drive device and the smoke baffle is rotated by the smoke baffle drive device, so that the panel contacts the first side of the smoke baffle. When the smoke baffle is in the third opening angle range, the panel drive device moves the panel until it contacts the first side of the smoke baffle.

[0006] Preferably, the process of bringing the panel into contact with the first side edge of the smoke baffle through a combination of the panel driving device moving the panel and the smoke baffle driving device rotating the smoke baffle includes the following steps: Obtain the oil fume concentration at the bottom front side of the smoke baffle within the second opening angle range, and determine the oil fume concentration. Is it less than the set threshold? : If so, first open the smoke baffle to the set angle. The concentration of oil fumes in front of the smoke baffle is checked again. If the concentration of oil fumes is still less than the preset threshold, the oil fume concentration will be checked again. Repeat the above rotation and detection steps until the oil fume concentration value exceeds the preset threshold for the first time. Or the first side of the smoke baffle contacts the panel, if it passes the first After the first rotation, the detected oil fume concentration exceeded the preset threshold for the first time. Furthermore, before the first side of the smoke baffle contacts the panel, the smoke baffle rotates at a set angle in the direction of its closure. The panel moves forward until it contacts the first side of the smoke baffle, and then the oil fume concentration at the bottom front of the smoke baffle is detected. If the detected oil fume concentration is less than a preset threshold... Then the panel will stop responding; If not, move the panel forward a certain distance first. The oil fume concentration at the bottom front of the smoke baffle is detected again. If the detected oil fume concentration is still not less than the preset threshold, the oil fume concentration will be checked again. Repeat the panel shifting and detection steps described above until the oil fume concentration detection value is lower than the preset threshold for the first time. Or the panel contacts the first side of the smoke baffle, if the first After the second shift, the detected oil fume concentration value was lower than the preset threshold for the first time. Furthermore, before the first side of the smoke baffle contacts the panel, the smoke baffle is rotated in the opening direction until it contacts the panel. Then, the oil fume concentration at the bottom front of the smoke baffle is detected. If the detected oil fume concentration value is not less than the preset threshold... If the smoke baffle stops moving, then check if the range hood fan speed is at its highest setting. If not, increase the fan speed by one level and check the smoke concentration at the bottom front of the smoke baffle. Repeat this process until the smoke concentration is below a preset threshold. If the detected oil fume concentration is still greater than the preset threshold even when the fan is at its highest setting, If the smoke escapes, the range hood will issue a smoke escape warning.

[0007] Considering that the burner's heat output corresponds to the intensity of cooking, the range hood and cooktop's knobs are linked. The current cooking status is obtained by monitoring the knob's rotation angle, which can be detected by force sensors. Generally, a larger knob rotation angle results in greater heat output. However, for cooktops with adjustable upper and lower flame settings, the heat output is highest at the middle knob angle and relatively lower at the initial or maximum angle, allowing for adjustments to the cooking status accordingly.

[0008] As another way to obtain pre-cooking status information, the current cooking status information can be obtained by detecting the amount of cooking fumes using a fume detection device. This fume detection device can be a visual detection device or other existing fume concentration sensors.

[0009] As an improvement, a pressure sensor is installed on the first side of the smoke baffle. When the smoke baffle rotates outward and contacts the first side of the smoke baffle, or when the panel moves forward and contacts the first side of the smoke baffle, the pressure sensor identifies this and controls the corresponding smoke baffle drive device and panel drive device to stop moving. With a pressure sensor installed on the rear side of the smoke baffle, when the smoke baffle flips to its maximum angle and contacts the panel, or when the panel moves forward to its maximum distance and contacts the smoke baffle, it stops moving, ensuring the safety of the smoke baffle and panel.

[0010] As a further improvement, an anti-collision pad is also provided on the first side of the smoke baffle.

[0011] To simplify the structure of the panel driving device, the area above the air inlet on the front side wall of the housing is referred to as the mounting wall. The driving device is a linear motion mechanism mounted on the mounting wall. The panel moves in a direction perpendicular to the mounting wall under the drive of the linear motion mechanism. It is conceivable that the movement process of "the panel moving closer to or away from the first side of the smoke baffle in the open state" is not limited to linear movement in a direction perpendicular to the mounting wall. It can also be linear movement in a front-back direction, or deflection movement (including fixed-axis rotation or non-fixed-axis rotation).

[0012] To improve the accuracy of panel movement, the linear motion mechanism includes a drive motor and a lead screw and slider assembly. The lead screw and slider assembly includes a lead screw and a slider. The lead screw is connected to the output shaft of the drive motor and can rotate around its own axis under the drive of the drive motor. The slider is disposed on the panel and is threadedly connected to the lead screw.

[0013] In order to make the panel as close as possible to or fit against the mounting wall, the drive motor is located on the side of the mounting wall facing the inside of the housing, and the mounting wall has a first clearance opening at a position corresponding to the slider. The slider is located on the back of the panel and can extend into the housing through the first clearance opening.

[0014] As an improvement, the panel includes a panel body and a panel support, the panel support being located on the back of the panel body, and the slider being located on the side of the panel support opposite to the panel body.

[0015] As an improvement, the front sidewall of the housing is tilted backward from top to bottom, and the panel is also tilted backward from top to bottom.

[0016] Compared with the prior art, the advantages of this invention are as follows: This invention solves the problem of smoke leakage through the gap between the smoke baffle and the panel by combining the rotation of the smoke baffle, the movement of the panel, and the adjustment of the fan speed. Specifically, it selects and combines the rotation of the smoke baffle and the movement of the panel based on the acquired cooking status information. Thus, while solving the problem of smoke leakage through the gap on the first side of the smoke baffle, it also ensures that the deflection angle of the smoke baffle is adapted to the actual cooking conditions. This not only alleviates the risk of smoke leakage on the front side of the smoke baffle, but also avoids the discomfort during cooking caused by excessive forward or backward deflection of the smoke baffle, thereby improving the user experience. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a range hood according to an embodiment of the present invention; Figure 2 This is a left view of the range hood according to an embodiment of the present invention (the panel is in its initial position). Figure 3 This is a left view of a range hood according to an embodiment of the present invention (the panel is in a state of being moved outwards). Figure 4 This is a vertical sectional view of the range hood according to an embodiment of the present invention, cut along the front-to-back direction; Figure 5 This is a vertical sectional view of the range hood according to an embodiment of the present invention, cut along the front-to-back direction; Figure 6 This is a vertical sectional view of the range hood according to an embodiment of the present invention, cut along the front-to-back direction; Figure 7 This is a schematic diagram showing parameters such as the panel movement distance and the deflection angle of the smoke baffle in an embodiment of the present invention. Figure 8 This is a flowchart of a control method for preventing smoke escape from a range hood according to an embodiment of the present invention. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0020] Figures 1-8A preferred embodiment of the range hood and its control method of the present invention is shown. The range hood includes a housing 10 and a centrifugal fan disposed within the housing 10. The housing 10 generally includes a fan frame 11 and a smoke collection hood 12 disposed at the bottom of the fan frame 11, with the inner cavity of the fan frame 11 communicating with the inner cavity of the smoke collection hood 12. An air intake is provided on the front side wall of the smoke collection hood 12, through which external smoke can enter the smoke collection hood 12. The centrifugal fan is disposed within the fan frame 11. When the centrifugal fan operates, it generates negative pressure, allowing external oil fumes to be drawn into the smoke collection hood 12 through the air intake. An oil filter is also provided at the air intake of the smoke collection hood 12 for filtering oil fumes. An oil cup 16 is provided at the bottom of the smoke collection hood 12. The oil cup 16 is an elongated strip extending laterally, used to collect oil stains flowing down from the smoke collection hood 12. The front of the smoke hood 12 is also provided with a smoke baffle 20 that can deflect back and forth relative to the smoke hood 12. The smoke baffle 20 is connected to the main body of the smoke hood 12 through a smoke baffle movement mechanism 21. Specifically, it can deflect forward to open the aforementioned air intake and deflect backward to block and close the aforementioned air intake. The smoke baffle movement mechanism 21 that drives the smoke baffle 20 to deflect can adopt a conventional hinge movement mechanism in the prior art, which will not be described in detail here. Generally speaking, the smoke baffle 20 rotates along a first axis extending left and right, and the center of rotation is located inside the housing 10. Therefore, as the smoke baffle 20 opens to a larger angle, the gap between the inner side of the smoke baffle 20 and the panel of the upper area of ​​the air inlet 120 of the smoke hood 12 will gradually decrease.

[0021] In this embodiment, the front sidewall of the smoke hood 12 slopes backward from top to bottom. The area of ​​the front sidewall of the smoke hood 12 above the air inlet 120 is designated as the mounting wall 121. A panel is provided on the mounting wall 121, and the size of the panel is substantially the same as the size of the mounting wall 121. The mounting wall 121 and the panel also slope backward from top to bottom. The smoke baffle 20 is a strip plate extending left and right, having a first side 201 adjacent to the first axis and a second side 202 away from the first axis.

[0022] A driving device is also provided on the mounting wall 121 of the smoke hood 12. The driving device is a linear motion mechanism mounted on the mounting wall 121. The linear motion mechanism includes a drive motor 41 and a lead screw and slider assembly. A mounting plate with its extension direction basically perpendicular to the mounting wall 121 is provided on the inner side wall of the mounting wall 121. The drive motor 41 is fixed on the mounting plate. The lead screw and slider assembly includes a lead screw 42 and a slider 43. The lead screw 42 is connected to the output shaft of the drive motor 41 and can rotate around its own axis under the drive of the drive motor 41. The extension direction of the lead screw 42 is basically perpendicular to the mounting wall 121. The panel includes a panel body 131 and a panel bracket 132 attached to the back of the panel body 131. For aesthetic reasons, the panel body 131 is a glass plate. The slider 43 is located on the side of the panel bracket 132 away from the panel body 131 and is threadedly connected to the lead screw 42. When the drive motor 41 rotates forward and backward, the panel moves in a direction perpendicular to the mounting wall 121 under the drive of the lead screw and slider assembly, so that it can move closer to or away from the first side 201 of the smoke baffle 20 in the open state. When the panel moves closer to the first side 201 of the smoke baffle 20, the gap between the panel and the first side 201 of the smoke baffle 20 becomes smaller or can be eliminated, which can effectively improve or avoid the problem of oil fumes escaping here.

[0023] The drive motor 41 is located on the side of the mounting wall 121 facing the inside of the housing 10, and a first clearance opening 1211 is provided on the mounting wall 121 at a position corresponding to the slider 43. The slider 43 is located on the back of the panel. The opening size of the first clearance opening 1211 is large enough to allow the slider 43 to pass through the first clearance opening 1211 and extend into the smoke hood 12. In this way, the panel can be as close as possible to or fit against the mounting wall 121 in the initial position. When the smoke baffle 20 is in the closed state, the protrusion height of the front side of the smoke baffle 20 and the front side of the panel can also be consistent, ensuring the overall aesthetics and refinement of the front of the smoke hood 12.

[0024] A compressible smoke-proof foam 14 is provided between the panel and the mounting wall 121, which can be restored after pressure release. When the panel moves back and forth relative to the mounting wall 121, the smoke-proof foam 14 remains in a filled state, preventing oil fumes from leaking through the gap between the panel and the mounting wall 121. Preferably, the smoke-proof foam 14 can be provided only along the left-right direction between the bottom edge of the panel and the bottom edge of the mounting wall 121.

[0025] The back of the panel bracket 132 is also provided with a flap 1321 extending toward the mounting wall 121. The extension direction of the flap 1321 is basically perpendicular to the panel bracket 132. Specifically, the flap 1321 can be formed by stamping the panel bracket 132. There are two flaps 1321, which are respectively provided on the left and right sides of the back of the panel bracket 132. The mounting wall 121 has a second clearance opening 1212 at the position corresponding to the two flaps 1321. The bottom edge of the second clearance opening 1212 is also provided with a guide support plate 1213 extending toward the inside of the housing 10. The extension direction of the guide support plate 1213 is basically perpendicular to the mounting wall 121. The guide support plate 1213 can also be formed by stamping the mounting wall 121. The flap 1321 is also provided with a freely rotating roller 1322. The flap 1321 is located above the guide support plate 1213. When the panel moves back and forth, the roller 1322 on the flap 1321 can roll into contact with the guide support plate 1213, thereby ensuring the stability of the panel movement.

[0026] A limiting stop 1323 is also provided at the end of the flip plate 1321 away from the panel. The limiting stop 1323 is located on the side of the mounting wall 121 facing the inside of the housing 10. The limiting stop 1323 can limit the extreme position of the panel's outward movement. That is, when the panel moves outward a certain distance, the limiting stop 1323 on the flip plate 1321 can contact the mounting wall 121, and the outward movement of the panel ends, thereby increasing the reliability and stability of the panel's translational movement.

[0027] An anti-collision pad is also provided at the first side 201 of the smoke baffle 20. The anti-collision pad can be made of flexible material such as rubber to ensure the safety of the smoke baffle 20 and the panel. Furthermore, a pressure sensor is also provided at the first side 201 of the smoke baffle 20. The pressure sensor, the drive device, and the control system of the range hood are electrically connected. The control system can control the drive device to stop operating when the pressure signal transmitted by the pressure sensor reaches a set value. Similarly, the smoke baffle movement mechanism 21 used to drive the smoke baffle 20 to deflect, the pressure sensor, and the control system of the range hood are also electrically connected. The control system can control the smoke baffle movement mechanism 21 to stop operating when the pressure signal transmitted by the pressure sensor reaches a set value. With the pressure sensor installed on the rear side of the smoke baffle 20, when the smoke baffle 20 flips to its maximum angle and contacts the panel, or when the panel moves forward to its maximum distance and contacts the smoke baffle 20, the movement stops, ensuring the safety of the smoke baffle 20 and the panel.

[0028] Generally, the movement of the panel can be adjusted by the user through control buttons, but this process is relatively cumbersome. Preferably, in this embodiment, in order to automatically control the rotation of the smoke baffle 20 and / or the movement of the panel and / or the raising and lowering of the airflow level according to the oil fume concentration on the front and rear sides of the smoke baffle 20, thereby effectively alleviating the problem of smoke escaping from the front and rear sides of the smoke baffle 20, a first oil fume sensor 31 is also provided on the back of the smoke baffle 20 near the first side 201 and a second oil fume sensor 32 is provided near the second side 202. The first oil fume sensor 31, the second oil fume sensor 32, the smoke baffle movement mechanism 21 and the drive device are all electrically connected to the control system of the range hood, so that the control system can control the movement of the smoke baffle movement mechanism 21 to adjust the opening angle of the smoke baffle 20 and / or control the drive device to adjust the movement distance of the panel according to the oil fume concentration signal transmitted by the first oil fume sensor 31 and the second oil fume sensor 32.

[0029] The smoke control method for the range hood in this embodiment includes the following steps: After the range hood is started, it acquires the current cooking status information and categorizes the cooking state into three cooking modes based on the intensity of the cooking process: a first cooking mode, a second cooking mode, and a third cooking mode. The intensity of the cooking process increases sequentially from the first to the third cooking mode. Then, based on the acquired cooking status information, the smoke baffle 20 opens to a suitable angle range. The opening angle range of the smoke baffle 20 includes a first opening angle range corresponding to the first cooking mode, a second opening angle range corresponding to the second cooking mode, and a third opening angle range corresponding to the third cooking mode. These opening angle ranges increase sequentially. To ensure effective smoke collection, the smoke baffle 20 tilts forward and downward within each of the aforementioned opening angle ranges. Furthermore, when acquiring the current cooking status information, the specific opening angle of the smoke baffle 20 is generally the midpoint of the corresponding opening angle range (first, second, or third opening angle range). When the smoke baffle 20 is in the first opening angle range, the smoke baffle 20 is rotated in the opening direction by the smoke baffle driving device, so that the first side 201 of the smoke baffle 20 contacts the panel. When the smoke baffle 20 is in the second opening angle range, the panel is moved by the panel driving device and the smoke baffle 20 is rotated by the smoke baffle driving device, so that the panel contacts the first side 201 of the smoke baffle 20. When the smoke baffle 20 is in the third opening angle range, the panel driving device moves the panel until it contacts the first side 201 of the smoke baffle 20.

[0030] More specifically, when the current cooking state is detected to be in the first cooking mode, the smoke baffle gradually opens and stops when it reaches the set opening angle within the first opening angle range. At this time, since the cooking conditions are relatively less intense, increasing the set opening angle of the smoke baffle makes it less likely for fumes to escape from the front. Furthermore, after increasing the set angle, the front of the smoke baffle can move forward significantly, meaning the negative pressure zone can also move forward significantly. Therefore, it is possible to simply rotate the smoke baffle until its first side contacts the panel. Once the first side of the smoke baffle contacts the panel, the concentration of fumes in front of the smoke baffle is detected, and this can be monitored over time. The concentration of cooking fumes is detected N times, and the minimum value is taken as the concentration value. If this concentration value is less than a preset threshold, the oil fume concentration is considered zero. The range hood will continue to operate under this condition, and if the concentration is not less than the preset threshold... The system checks if the range hood's fan speed is at its highest setting. If not, it increases the fan speed by one level and checks the oil fume concentration in front of the baffle plate again. This process is repeated until the oil fume concentration is below a preset threshold. If the detected value of the oil fume concentration is still not less than the preset threshold even at the highest setting... If this happens, the range hood will issue a warning to alert the user.

[0031] When the second cooking mode is detected, the smoke baffle gradually opens and stops when it reaches the set opening angle within the second opening angle range. At this time, the intensity of the cooking condition is moderate. The panel can be moved by the panel drive device and the smoke baffle can be rotated by the smoke baffle drive device to make the panel contact the first side of the smoke baffle. The specific steps are as follows: Obtain the oil fume concentration at the bottom front side of the smoke baffle within the second opening angle range, and determine the oil fume concentration. Is it less than the set threshold? : If so, first open the smoke baffle to the set angle. The concentration of oil fumes in front of the smoke baffle is checked again. If the concentration of oil fumes is still less than the preset threshold, the oil fume concentration will be checked again. Repeat the steps of opening and rotating the smoke baffle and detecting the oil fume concentration in front of the smoke baffle until the oil fume concentration value exceeds the preset threshold for the first time. Or the first side of the smoke baffle contacts the panel, if it passes the first After the first rotation, the detected oil fume concentration exceeded the preset threshold for the first time. Furthermore, before the first side of the smoke baffle contacts the panel, the smoke baffle rotates at a set angle in the direction of its closure. At this point, the total angle of rotation of the smoke baffle is The panel moves forward until it contacts the first side of the smoke baffle, and then the oil fume concentration at the bottom front of the smoke baffle is detected. If the detected oil fume concentration is less than a preset threshold... If the panel stops moving, then the panel will no longer move; in order to achieve precise control of the panel's forward movement, the panel movement distance is... It can be obtained from the corresponding functional relationship: The center of rotation of the smoke baffle is denoted as For the contact point with the panel Its radius of rotation is Its length If the panel remains stationary, the smoke baffle will be at its open angle. Continue opening from there, increasing the angle to... At this time, the opening angle of the smoke baffle is Contact point After rotating and coming into contact with the panel, the contact point is... ,but The angle of rotation is Its angle is When both the smoke baffle and the panel move, the angle by which the smoke baffle rotates increases is... The increased distance by moving the panel is Point A on the smoke baffle contacts the panel.

[0032] Establish an angle and length The functional relationship between them, such as Figure 7 As shown, the center of rotation In the panel The normal projection on is , With panel The intersection point is .exist In this context, the following geometric relationships exist:

[0033] in, This is the initial opening angle, which is a measurable value.

[0034] exist In this context, the following geometric relationships exist:

[0035] By combining the two formulas above, the angle can be obtained. and length The functional relationship between them is as follows:

[0036]

[0037]

[0038]

[0039] set up , It can be seen and All are constant values, angles and length The final functional relationship between them is as follows: .

[0040] If not, move the panel forward a certain distance first. The oil fume concentration at the bottom front of the smoke baffle is detected again. If the detected oil fume concentration is still not less than the preset threshold, the oil fume concentration will be checked again. Repeat the steps of moving the panel forward and detecting the oil fume concentration at the bottom front of the smoke baffle until the oil fume concentration detection value is lower than the preset threshold for the first time. Or the panel contacts the first side of the smoke baffle, if the first After the second shift, the detected oil fume concentration value was lower than the preset threshold for the first time. Furthermore, the first side of the smoke baffle has not yet made contact with the panel; at this point, the total distance the panel has shifted is... The smoke baffle rotates in the opening direction until it contacts the panel, and then the oil fume concentration at the bottom front of the smoke baffle is detected. If the detected oil fume concentration is not less than the preset threshold... If the smoke baffle stops moving, then check if the range hood fan speed is at its highest setting. If not, increase the fan speed by one level and check the smoke concentration at the bottom front of the smoke baffle. Repeat this process until the smoke concentration is below a preset threshold. If the detected oil fume concentration is still greater than the preset threshold even when the fan is at its highest setting, If the smoke escapes, the range hood will issue a smoke escape warning.

[0041] When the current cooking state is detected to be in the third cooking mode, the smoke baffle gradually opens and stops when it is rotated to the set opening angle within the third opening angle range. At this time, the cooking process is relatively intense. Even if the opening angle of the smoke baffle is increased by a small amount, the risk of oil fumes escaping from the front side will increase. Therefore, it is selected to move only the panel so that the first side of the smoke baffle contacts the panel.

[0042] Considering that the heat output of the stove burner corresponds to the intensity of cooking, this embodiment links the range hood to the stove's rotary switch. The current cooking status information is obtained by the rotation angle of the stove's rotary switch, which can be obtained using a force sensor or similar device. Generally, the larger the rotation angle of the stove's rotary switch, the greater the heat output. However, for stoves with adjustable upper and lower flames, the heat output is highest when the switch is at the middle angle, and relatively lower at the initial or maximum angle, allowing for adjustments to the cooking status information accordingly. Alternatively, the current cooking status information can also be obtained by detecting the amount of oil fumes using a fume detection device. This fume detection device can be a visual detection device or other existing oil fume concentration sensors.

Claims

1. A control method for preventing smoke from escaping from a range hood, the range hood comprising a housing and a smoke baffle, a front side wall of the housing being provided with an air inlet and a panel being arranged above a region of the air inlet, the smoke baffle being arranged on the housing and being capable of rotating about a first axis extending leftward and rightward under the drive of a smoke baffle driving device, and being capable of opening and closing the air inlet, the smoke baffle having a first side edge adjacent to the first axis and a second side edge away from the first axis, the panel being capable of moving toward or away from the first side edge of the smoke baffle in an open state under the drive of a panel driving device, characterized in that Includes the following steps: After the range hood is turned on, it acquires the current cooking status information and divides the cooking status into three cooking modes according to the intensity of the cooking process: a first cooking mode, a second cooking mode, and a third cooking mode. The intensity of the cooking process increases sequentially from the first cooking mode to the third cooking mode. Then, based on the acquired current cooking status information, the smoke baffle opens to a suitable opening angle range. The opening angle range of the smoke baffle includes a first opening angle range corresponding to the first cooking mode, a second opening angle range corresponding to the second cooking mode, and a third opening angle range corresponding to the third cooking mode. The first opening angle range, the second opening angle range, and the third opening angle range increase sequentially. When the smoke baffle is in the first opening angle range, the smoke baffle is rotated along the opening direction by the smoke baffle drive device, so that the first side of the smoke baffle contacts the panel. When the smoke baffle is in the second opening angle range, the panel is moved by the panel drive device and the smoke baffle is rotated by the smoke baffle drive device, so that the panel contacts the first side of the smoke baffle. When the smoke baffle is in the third opening angle range, the panel drive device moves the panel until it contacts the first side of the smoke baffle.

2. The control method for preventing smoke escape from a range hood according to claim 1, characterized in that: The process of bringing the panel into contact with the first side edge of the smoke baffle through a combination of actions involving moving the panel via a panel driving device and rotating the smoke baffle via a smoke plate driving device includes the following steps: Obtain the oil fume concentration at the bottom front side of the smoke baffle within the second opening angle range, and determine the oil fume concentration. Is it less than the set threshold? : If so, first open the smoke baffle to the set angle. The concentration of oil fumes in front of the smoke baffle is checked again. If the concentration is still less than the preset threshold, the oil fume concentration will be checked again. Repeat the steps of opening and rotating the smoke baffle and detecting the oil fume concentration in front of the smoke baffle until the oil fume concentration value exceeds the preset threshold for the first time. Or the first side of the smoke baffle contacts the panel, if it passes the first After the first rotation, the detected oil fume concentration exceeded the preset threshold for the first time. Furthermore, before the first side of the smoke baffle contacts the panel, the smoke baffle rotates at a set angle in the direction of its closure. The panel moves forward until it contacts the first side of the smoke baffle, and then the oil fume concentration at the bottom front of the smoke baffle is detected. If the detected oil fume concentration is less than a preset threshold... Then the panel will stop responding; If not, then first move the panel forward a certain distance. The oil fume concentration at the bottom front of the smoke baffle is detected again. If the detected oil fume concentration is still not less than the preset threshold, the oil fume concentration will be checked again. Repeat the steps of moving the panel forward and detecting the oil fume concentration at the bottom front of the smoke baffle until the oil fume concentration detection value is lower than the preset threshold for the first time. Or the panel contacts the first side of the smoke baffle, if the first After the second shift, the detected oil fume concentration value was lower than the preset threshold for the first time. Furthermore, before the first side of the smoke baffle contacts the panel, the smoke baffle is rotated in the opening direction until it contacts the panel. Then, the oil fume concentration at the bottom front of the smoke baffle is detected. If the detected oil fume concentration value is not less than the preset threshold... If the smoke baffle stops moving, then check if the range hood fan speed is at its highest setting. If not, increase the fan speed by one level and check the smoke concentration at the bottom front of the smoke baffle. Repeat this process until the smoke concentration is below a preset threshold. If the detected oil fume concentration is still greater than the preset threshold even when the fan is at its highest setting, If the smoke escapes, the range hood will issue a smoke escape warning.

3. The control method for preventing smoke escape from a range hood according to claim 1 or 2, characterized in that: The range hood is linked to the knob switch of the cooktop, and the current cooking status information is obtained by rotating the knob switch of the cooktop.

4. The control method for preventing smoke escape from a range hood according to claim 1 or 2, characterized in that: The current cooking status information is obtained by detecting the amount of oil fumes using an oil fume detection device.

5. The control method for preventing smoke escape from a range hood according to claim 1 or 2, characterized in that: A pressure sensor is provided on the first side of the smoke baffle. When the smoke baffle rotates outward and contacts the first side of the smoke baffle, or when the panel moves forward and contacts the first side of the smoke baffle, the pressure sensor recognizes this and controls the corresponding smoke baffle drive device and panel drive device to stop moving.

6. The control method for preventing smoke escape from a range hood according to claim 1 or 2, characterized in that: The smoke baffle is also provided with a collision protection pad on the first side.

7. The control method for preventing smoke escape from a range hood according to claim 1 or 2, characterized in that: The front side wall of the housing, located above the air inlet, is referred to as the mounting wall. The panel driving device is a linear motion mechanism mounted on the mounting wall. The panel moves in a direction perpendicular to the mounting wall under the drive of the linear motion mechanism.

8. The control method for preventing smoke escape from a range hood according to claim 7, characterized in that: The linear motion mechanism includes a drive motor and a lead screw and slider assembly. The lead screw and slider assembly includes a lead screw and a slider. The lead screw is connected to the output shaft of the drive motor and can rotate around its own axis under the drive of the drive motor. The slider is disposed on the panel and is threadedly connected to the lead screw.

9. The control method for preventing smoke escape from a range hood according to claim 8, characterized in that: The drive motor is located on the side of the mounting wall facing the inside of the housing, and a first clearance opening is provided on the mounting wall at a position corresponding to the slider. The slider is located on the back of the panel and can extend into the housing through the first clearance opening.

10. The control method for preventing smoke escape from a range hood according to claim 9, characterized in that: The panel includes a panel body and a panel support. The panel support is located on the back of the panel body, and the slider is located on the side of the panel support opposite to the panel body.

11. The control method for preventing smoke escape from a range hood according to claim 1, characterized in that: The front sidewall of the housing slopes backward from top to bottom, and the panel also slopes backward from top to bottom.

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