Range hood

Abstract

The invention provides a range hood which comprises a range hood body provided with an air inlet, a folding smoke gathering plate, a user detector and a control device, the folding smoke gathering plate has an opening position and a folding position in the pivoting process, the folding smoke gathering plate comprises a first smoke gathering plate and a second smoke gathering plate, the upper end of the first smoke gathering plate is connected to the range hood body, and the lower end of the second smoke gathering plate is connected to the user detector. The lower end of the first smoke gathering plate is connected to the second smoke gathering plate, and the second smoke gathering plate can pivot relative to the first smoke gathering plate in the front-back direction. The user detector is used for detecting whether a user exists in front of the range hood or not, and the control device is used for controlling the effective pivoting radius of the folding smoke gathering plate to be a first value when the user detector detects that no user exists in front of the range hood and controlling the effective pivoting radius of the folding smoke gathering plate to be a second value when the user detector detects that a user exists in front of the range hood. The second smoke gathering plate is controlled to pivot downwards, so that the effective pivot radius has a second value smaller than the first value. Therefore, the user view is enlarged and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a range hood. Background Art

[0002] Range hoods are widely used as kitchen appliances. Cooking with cooking utensils produces fumes, which can be effectively reduced by using a range hood. This not only reduces the amount of fumes inhaled, protecting health, but also helps maintain a clean kitchen.

[0003] As the temperature of the cookware rises during cooking, the area over which the fumes spread increases. For example, when stewing or stir-frying over low heat, the fumes produced may only correspond to the size of the pot opening. However, when stir-frying over high heat, the fumes spread under the influence of the heat, causing the area of ​​the fumes to exceed the pot opening. Some existing range hoods are designed with a smoke-collecting plate to guide the fumes. The range hood can adjust the smoke-collecting area according to the size of the fumes, thereby enhancing the smoke-collecting effect.

[0004] However, these range hoods typically don't consider whether the smoke trap obstructs the user's view when operating. Even if the smoke trap is made of transparent material to facilitate viewing through the trap, fumes and moisture will condense and accumulate on the trap while the user is cooking, limiting the user's field of vision and resulting in a poor user experience. Summary of the Invention

[0005] In order to at least partially solve the problems existing in the prior art, some embodiments of the present invention provide a range hood, comprising: a range hood main body, wherein an air inlet is provided on the range hood main body; a foldable smoke collecting plate, wherein the air inlet is located behind the foldable smoke collecting plate, and the foldable smoke collecting plate is pivotally connected to the range hood main body around a predetermined axis, wherein the foldable smoke collecting plate has an open position and a retracted position during pivoting, wherein the open position is located in front of the retracted position, and the foldable smoke collecting plate comprises a first smoke collecting plate and a second smoke collecting plate, wherein the upper end of the first smoke collecting plate is connected to the range hood main body, and the lower end of the first smoke collecting plate is connected to the second smoke collecting plate, The second smoke collecting plate is pivotable in a forward-backward direction relative to the first smoke collecting plate; a user detector is configured to detect the presence of a user in front of the range hood; and a control device is configured to, when the foldable smoke collecting plate is in the open position: when the user detector detects the absence of a user in front of the range hood, control the effective pivot radius of the foldable smoke collecting plate to a first value, where the pivot radius is the linear distance between the lower end of the second smoke collecting plate and a predetermined axis; and when the user detector detects the presence of a user in front of the range hood, control the second smoke collecting plate to pivot downward so that the effective pivot radius has a second value that is smaller than the first value. Thus, while cooking, the user can control the range hood so that the foldable smoke collecting plate moves from a retracted position to an unfolded position. When the foldable smoke collecting plate is in the unfolded position and the absence of a user is detected in front of the range hood, the second smoke collecting plate is extended outward, thereby providing a sufficiently large smoke collecting range for the first and second smoke collecting plates in this position and achieving a better smoke collecting effect. When the presence of a user is detected in front of the range hood, the second smoke collecting plate is retracted, thereby increasing the user's field of view and improving the user experience.

[0006] For example, when the effective pivot radius of the foldable smoke collecting plate is a first value, the horizontal distance between the lower end of the second smoke collecting plate and the back surface of the range hood body is greater than a first preset value, which is greater than or equal to 50 cm. Therefore, when the foldable smoke collecting plate is in this position, it can contain oil smoke emitted upward from the cookware under various cooking conditions.

[0007] For example, when the effective pivot radius of the foldable smoke collecting plate is the second value, the horizontal distance between the lower end of the second smoke collecting plate and the back surface of the range hood body is greater than a second preset value, which is greater than or equal to 50 cm. This ensures optimal smoke extraction while ensuring a clear view for the user.

[0008] For example, the foldable smoke collecting plate has multiple opening positions, and the acute angle between the first smoke collecting plate and the horizontal plane has different third values ​​when the foldable smoke collecting plate is in different opening positions. The range hood also includes a smoke sensor for detecting smoke concentration. The control device is configured to control the foldable smoke collecting plate to different opening positions based on the smoke concentration, such that the third value is negatively correlated with the smoke concentration. The first smoke collecting plate can be maintained at any angle between the stowed position and the maximum opening position, and the second smoke collecting plate can also be maintained at any angle within its range of travel. This allows the optimal position for smoke collection and avoiding view obstruction to be determined by precisely adjusting the pivot angle of the first smoke collecting plate and coordinating it with the pivot angle of the second smoke collecting plate. Optionally, the first smoke collecting plate can be pivoted to multiple angles, for example, at 30, 60, and 90 degrees from the horizontal plane. The second smoke collecting plate can also be pivoted to multiple angles. In this case, the view obstruction and smoke collection performance of the range hood at each angle can be determined with a relatively small number of experiments, simplifying the control logic.

[0009] Exemplarily, the control device is further configured to adjust the acute angle between the second smoke collecting plate and the horizontal plane to have different fourth values ​​when the foldable smoke collecting plate is in different unfolded positions, such that the fourth value is positively correlated with the concentration of cooking smoke. Therefore, the greater the cooking smoke, the closer the lower end of the second smoke collecting plate is to the cookware, thereby providing a better smoke collection effect.

[0010] Illustratively, when the foldable smoke collecting plate is in the open position, the acute angle between the first smoke collecting plate and the horizontal plane has a third value. During the pivoting process, the foldable smoke collecting plate also has a stir-frying position. In this stir-frying position, the acute angle between the first smoke collecting plate and the horizontal plane has a fifth value, which is less than the third value. The range hood also includes a smoke sensor for detecting smoke concentration. The control device is configured to control the foldable smoke collecting plate to the stir-frying position when the smoke concentration exceeds a preset threshold, and to control the foldable smoke collecting plate to the open position when the smoke concentration is less than or equal to the preset threshold. Optionally, the length of the first smoke collecting plate is such that, at its maximum pivot angle, it can fully cover the range of smoke emitted during stir-frying. In this case, the second smoke collecting plate can be controlled to be in a vertical position so that its lower end is as close to the cookware as possible to provide better smoke collection. Optionally, the length of the first smoke collecting plate is insufficient to fully cover the range of smoke emitted during stir-frying at its maximum pivot angle, requiring the second smoke collecting plate to cooperate with it to cover the range of smoke emitted. At this time, it is necessary to control the angle between the second smoke collecting plate and the vertical direction so that the sum of the length of the second smoke collecting plate in the horizontal direction and the length of the first smoke collecting plate in the horizontal direction can cover the divergence range of the oil smoke. In some exemplary embodiments, when the first smoke collecting plate is pivoted to a certain angle, it is possible to make the second smoke collecting plate not affect the user's line of sight at any pivot angle. In this case, the range hood can arbitrarily adjust the pivot angles of the first and second smoke collecting plates within this range to provide the best smoke collecting effect without having to consider affecting the user's line of sight.

[0011] Exemplarily, the distance between the lower end of the first cigarette collecting plate and the predetermined axis is less than L, Here, x0 is the horizontal distance from the predetermined axis to the back of the range hood body; y0 is the vertical height from the predetermined axis to the top of the cookware; h is the vertical height from eye level to the top of the cookware; a is the horizontal distance from the back edge of the cookware to the wall; and l is the horizontal distance from eye level to the back edge of the cookware. This allows the range hood to control the pivot angles of the first and second smoke traps based on the hood installation and the user's height.

[0012] For example, the range hood further includes a height detector for detecting the height of a user in front of the range hood. The control device is further configured to determine the downward pivot angle of the second cigarette collecting plate based on the height detected by the height detector when the foldable cigarette collecting plate is in the open position. This allows the range hood to more accurately avoid obstructing the user's view, providing a better user experience.

[0013] For example, the angle at which the second cigarette collecting plate pivots downward is positively correlated with the height of the user, thereby avoiding blocking the user's sight.

[0014] For example, when the foldable smoke collecting plate is in the unfolded position, the angle between the first smoke collecting plate and the second smoke collecting plate is less than or equal to 180 degrees. When the first smoke collecting plate is nearly vertical (e.g., the third value is greater than 45 degrees), the angle between the second smoke collecting plate and the first smoke collecting plate is relatively larger, for example, greater than 135 degrees, or even up to 180 degrees, so that the first smoke collecting plate and the second smoke collecting plate as a whole can guide the oil smoke toward the air inlet. The angle between the first smoke collecting plate and the second smoke collecting plate is not greater than 180 degrees to avoid the direction of the oil smoke being guided by the first smoke collecting plate being opposite to the direction of the oil smoke being guided by the second smoke collecting plate, causing the oil smoke to be guided away from the air inlet by the second smoke collecting plate.

[0015] Exemplarily, the control device is further configured to: when the foldable cigarette collecting plate is in the open position:

[0016] When the height detected by the height detector is less than a preset height value, the acute angle between the first cigarette holding plate and the horizontal plane is set to a fifth value; and when the height detected by the height detector is greater than or equal to the preset height value, the acute angle between the first cigarette holding plate and the horizontal plane is set to a sixth value, with the sixth value being greater than the fifth value. In this case, the first cigarette holding plate can be controlled to pivot so that the lower portion of the second cigarette holding plate is out of the user's sight. In the above embodiment, out of the user's sight can be prioritized, while the smoke-holding effect can be a secondary consideration.

[0017] For example, the range hood further includes a distance sensor disposed on the range hood body for detecting the height of the cookware. The control device is further configured to determine the downward pivot angle of the second smoke collecting plate based on the height between the distance sensor and the cookware when the foldable smoke collecting plate is in the open position. This allows the second smoke collecting plate to be more accurately hidden from the user's line of sight, thereby enabling the second smoke collecting plate to achieve a better smoke collecting effect.

[0018] For example, the angle at which the second smoke collecting plate pivots downward is positively correlated with the height from the distance measuring sensor to the cookware, thereby providing a sufficient smoke collecting range while avoiding affecting the user's sight.

[0019] For example, the control device is further configured to, when the foldable smoke trap is in the open position: when the height from the distance sensor to the cookware is greater than a preset height, set the acute angle between the first smoke trap and the horizontal plane to a seventh value; and when the height from the distance sensor to the cookware is less than or equal to the preset height, set the acute angle between the first smoke trap and the horizontal plane to an eighth value, with the eighth value being greater than the seventh value. In this way, the range hood can adapt to cooking conditions with cookware of different heights.

[0020] For example, when the foldable smoke collecting plate is in the retracted position, the first smoke collecting plate and the second smoke collecting plate at least partially cover the air inlet, thereby at least partially covering the air inlet, thereby preventing the backflow of oil smoke from the common flue, or preventing the dripping of condensed oil from the range hood body.

[0021] This summary introduces a series of simplified concepts that will be further described in the detailed description. This summary is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0022] The advantages and features of the present invention are described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following drawings of the present invention are hereby incorporated into the present invention for understanding the present invention. The drawings show embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0024] Figure 1 A schematic diagram of a usage scenario of a range hood according to an exemplary embodiment of the present invention;

[0025] Figure 2 A schematic diagram of a usage scenario of a range hood according to another exemplary embodiment of the present invention;

[0026] Figure 3A and Figure 3BSchematic diagrams of a first and a second folding cigarette collecting plate of a cigarette hood according to another exemplary embodiment of the present invention pivoting to different angles around a predetermined axis;

[0027] Figure 4 Schematic diagram comparing the positions of the folded cigarette collecting plate of a cigarette hood according to an exemplary embodiment of the present invention when users have different heights;

[0028] Figure 5 Schematic diagram comparing the positions of the folded smoke-collecting plate of a range hood according to an exemplary embodiment of the present invention when the cooker is at different heights;

[0029] Figure 6 Based on Figure 2 Schematic diagram of the pivoting principle of the first and second cigarette collecting plates in the illustrated embodiment;

[0030] Figures 7 to 12 Schematic diagram of the positions of the folded smoke collecting plate of a range hood under different cooking conditions according to an exemplary embodiment of the present invention.

[0031] The above drawings include the following reference numerals:

[0032] 100. Range hood; 101. Range hood body; 102. Air inlet; 103. Folding smoke collecting plate; 110. First smoke collecting plate; 120. Second smoke collecting plate; 130. User detector; 140. Oil fume sensor; 200. Cookware; 300. User. DETAILED DESCRIPTION

[0033] In the following description, a large amount of detail is provided to facilitate a thorough understanding of the present invention. However, it will be appreciated by those skilled in the art that the following description merely illustrates preferred embodiments of the present invention, and that the present invention may be practiced without one or more of these details. Furthermore, to avoid confusion with the present invention, some technical features well known in the art have not been described in detail.

[0034] To provide a thorough understanding of the embodiments of the present invention, a detailed description of the structure will be provided in the following description. It should be understood that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described below in detail, but in addition to these detailed descriptions, the present invention may also have other embodiments.

[0035] An embodiment of the present invention provides a range hood, which will be described in detail below with reference to the accompanying drawings.

[0036] like Figure 1As shown, the range hood 100 includes a range hood main body 101, on which an air inlet 102 is provided. The range hood main body 101 can be fixed to the wall by expansion screws or the like, and the cooker is positioned below the range hood main body 101. A fan can be provided inside the range hood main body 101 to draw in the oil smoke below through the air inlet 102. The upper portion of the range hood main body 101 can be connected to a public oil smoke duct in a residence. The range hood 100 may further include a foldable smoke collecting plate 103, and the air inlet 102 is located behind the foldable smoke collecting plate 103. The foldable smoke collecting plate 103 is pivotally connected to the range hood main body 101 around a predetermined axis, and the foldable smoke collecting plate 103 has an open position and a retracted position during the pivoting process, with the open position being located in front of the retracted position. It should be noted that the air inlet 102 is located behind the foldable smoke collecting plate 103, which means that the predetermined axis for the pivoting of the foldable smoke collecting plate 103 is set in front of the air inlet 102. In other words, the part where the foldable smoke collecting plate 103 is installed to the range hood body 101 is in front of the air inlet 102, rather than the entire part of the foldable smoke collecting plate 103 being located in front of the air inlet 102 in any state.

[0037] The foldable smoke collecting plate 103 may include a first smoke collecting plate 110 and a second smoke collecting plate 120. The upper end of the first smoke collecting plate 110 is connected to the range hood body 101, and the lower end of the first smoke collecting plate 110 is connected to the second smoke collecting plate 120. The second smoke collecting plate 120 is pivotable relative to the first smoke collecting plate 110 in a forward and backward direction. When the foldable smoke collecting plate 103 is in the open position, the first smoke collecting plate 110 and the second smoke collecting plate 120 are both extended forward, providing a larger smoke collecting area. In other words, the smoke collecting plate has a larger projected area on the horizontal plane, so that a larger range of oil smoke can be completely collected and directed to the air inlet 102.

[0038] The range hood 100 may also include a user detector 130, which is used to detect the presence of a user 300 in front of the range hood 100. Optionally, the user detector 130 may include an infrared sensor to detect the presence of an object in front of the range hood 100, thereby determining the presence of the user 300. Optionally, the user detector 130 may include a distance sensor. Based on the distance information detected by the distance sensor, the user 300 may be determined to be absent from the range hood 100 when the distance information is greater than a preset threshold, or to be present in front of the range hood 100 when the distance information is less than the preset threshold. The preset threshold may be less than the distance between the range hood body 101 and the wall directly opposite it. Optionally, the user detector 130 may also include a sensor such as a millimeter-wave radar to accurately obtain information about the user 300, including but not limited to the presence of the user 300 in front of the range hood 100 and the user's height. For ease of understanding, the user's height is not described below. The user's height can be considered to be an average height (165 cm). In the following embodiment of determining the user's height by a height detector, the users can also be roughly divided into those above 165 cm and those below 165 cm.

[0039] The range hood 100 may include a control device, which may include a controller and actuators such as motors and electric cylinders. Optionally, the actuator may be arranged inside the range hood body 101, driving the first smoke collecting plate 110 and the second smoke collecting plate 120 through structures such as connecting rods. Optionally, at least one of the actuators may be arranged on the first smoke collecting plate 110, moving with the pivoting of the first smoke collecting plate 110 and driving the second smoke collecting plate 120 to pivot. The controller may be constructed using electronic components such as comparators, registers, and digital logic circuits, or may be implemented using processor chips such as single-chip microcomputers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic arrays (PLAs), and application-specific integrated circuits (ASICs), and their peripheral circuits.

[0040] The control device can be configured to control the effective pivot radius of the foldable smoke collecting plate 103 to a first value when the foldable smoke collecting plate 103 is in the open position and the user detector 130 detects that the user 300 is not in front of the range hood 100. The pivot radius is the straight-line distance between the lower end of the second smoke collecting plate 120 and the predetermined axis. It should be understood that if the user 300 is not in front of the range hood 100, there is no need to consider whether the smoke collecting plate will block the user's 300 line of sight. In this case, the angles of the first and second smoke collecting plates 110, 120 can be controlled to ensure that the smoke collecting plates provide an optimal smoke collection effect. The control device is further configured to control the second smoke collecting plate 120 to pivot downward, such that the effective pivot radius has a second value that is smaller than the first value, when the foldable smoke collecting plate 103 is in the open position and the user detector 130 detects that the user 300 is in front of the range hood 100. This reduces the probability that the lower end of the second smoke collecting plate 120 will block the user's 300 line of sight, thereby providing the user 300 with a better view of the cooking process.

[0041] Thus, while cooking, user 300 can control the range hood 100 to move the foldable smoke collecting plate 103 from the retracted position to the unfolded position. When the foldable smoke collecting plate 103 is in the unfolded position and it is detected that the user 300 is not in front of the range hood 100, the second smoke collecting plate 120 is extended outward, so that the first and second smoke collecting plates 110, 120 have a sufficiently large smoke collecting range in this position, achieving a better smoke collecting effect. If the user 300 is detected in front of the range hood 100, the second smoke collecting plate 120 is retracted, thereby increasing the user's field of view and improving the user experience.

[0042] For example, when the foldable smoke collecting plate 103 is in the retracted position, the first smoke collecting plate 110 and the second smoke collecting plate 120 at least partially cover the air inlet 102. This can at least partially cover the air inlet 102, thereby preventing the backflow of oil smoke from the common flue or preventing condensed oil from dripping from the range hood body 101.

[0043] For example, when the effective pivot radius of the foldable smoke-collecting plate 103 is at a first value, the horizontal distance between the lower end of the second smoke-collecting plate 120 and the back of the range hood body 101 is greater than a first preset value, which is greater than or equal to 35 cm. Typically, the maximum size of the cookware 200 used by the user 300 can be determined; typically, cookware is no larger than 30 cm. The distance between the rear edge of the cookware 200 and the wall can also be determined, generally ranging from 8 to 15 cm. For example, if the user uses a smaller cookware 200, the rear edge of the cookware 200 may be approximately 15 cm from the wall. The distance between the front surface of the range hood body 101 and the wall is approximately 35 cm. When the first preset value is 35 cm, the extension range of the foldable smoke-collecting plate 103 can be within the front surface of the range hood body 101. Alternatively, the first preset value can be 45 cm or even 50 cm. In this case, the extension range of the foldable smoke-collecting plate 103 can extend beyond the front surface of the range hood body 101, even past the front edge of the cookware 200. When the foldable smoke collecting plate 103 is in this position, it can cover the oil smoke emitted upward from the cookware 200 under various cooking conditions.

[0044] Exemplarily, when the effective pivot radius of the foldable smoke collecting plate 103 is the second value, the horizontal distance between the lower end of the second smoke collecting plate 120 and the back of the range hood body 101 is greater than the second preset value. In some embodiments, when the effective pivot radius of the foldable smoke collecting plate 103 is the second value, in order to avoid blocking the sight of the user 300, the second preset value is less than 35 cm, thereby sacrificing part of the smoke collecting effect to ensure that the user 300 has sufficient field of vision. In a preferred embodiment, the second preset value is greater than or equal to 35 cm. In an embodiment not shown, the second preset value can also reach 45 cm or even 50 cm. In this way, the best oil smoke absorption effect can be provided while ensuring the field of vision of the user 300.

[0045] For example, the foldable cigarette collecting plate 103 has multiple opening positions, and the acute angle between the first cigarette collecting plate 110 and the horizontal plane has different third values ​​when the foldable cigarette collecting plate 103 is in different opening positions. Alternatively, the pivoting of the foldable cigarette collecting plate 103 can be continuous. In other words, the first cigarette collecting plate 110 can be maintained at any angle between the stowed position and the maximum opening position, and the second cigarette collecting plate 120 can also be maintained at any angle within its range of travel. This allows for precise adjustment of the pivot angle of the first cigarette collecting plate 110 and coordination with the pivot angle of the second cigarette collecting plate 120 to determine the optimal position for smoke collection and avoiding obstruction of vision. Alternatively, the first cigarette collecting plate 110 can be pivoted to multiple angles, for example, at 30, 60, and 90 degrees from the horizontal plane. The second cigarette collecting plate 120 can also be pivoted to multiple angles. In this case, the degree of obstruction of vision and the smoke collection performance of the range hood 100 at each angle can be determined with a relatively small number of experiments, simplifying the control logic.

[0046] The range hood 100 also includes a smoke sensor 140 for detecting smoke concentration. The smoke sensor 140 may include an infrared smoke sensor 140, an ionization smoke sensor, or other existing or future sensors. The control device is configured to control the foldable smoke collecting plate 103 to different opening positions based on smoke concentration, such that the third value is negatively correlated with the smoke concentration. To improve smoke collection, the second smoke collecting plate 120 must have a sufficient angle with the horizontal to prevent smoke from escaping from the edge of the second smoke collecting plate 120. Furthermore, the second smoke collecting plate 120 significantly impacts the user 300's line of sight. Therefore, the horizontal distance between the lower end of the second smoke collecting plate 120 and the back of the range hood body 101 is significantly affected by adjusting the pivot angle of the first smoke collecting plate 110. As described above, the greater the smoke concentration, the greater the range of its diffusion. The smaller the acute angle between the first smoke collecting plate 110 and the horizontal plane, the longer the horizontal distance the first smoke collecting plate 110 extends from the pivot axis, thus increasing the range it can cover. Optionally, when the first smoke collecting plate 110 is at the maximum pivot angle, it can completely cover the maximum smoke emission range under the current cooking conditions.

[0047] Exemplarily, the control device is further configured to adjust the acute angle between the second smoke collecting plate 120 and the horizontal plane to different fourth values ​​when the foldable smoke collecting plate 103 is in different unfolded positions, such that the fourth value is positively correlated with the smoke concentration. The closer the edge of the second smoke collecting plate 120 is to the cookware 200, the better the smoke collection effect. Based on the pivoting of the first smoke collecting plate 110, the fourth value is positively correlated with the smoke concentration, such that the greater the smoke, the closer the lower end of the second smoke collecting plate 120 is to the cookware 200, providing a better smoke collection effect.

[0048] For example, the range hood 100 may also include a height detector for detecting the height of the user 300 in front of the range hood 100. Typically, since the user 300 needs to operate a spatula or the handle of the pot 200 to cook, the distance between the user 300 and the range hood 100 can be roughly determined. Therefore, the angle at which the foldable smoke collecting plate 103 does not obstruct the user's view can be determined based on factors such as the user's height.

[0049] As described above, in some embodiments, the person detector may have the function of detecting a person's height. In other embodiments, the person detector and the height detector may be separate components. The height detector includes, but is not limited to, a camera module equipped with machine vision, an ultrasonic detection module, and a radar module. Specifically, due to the potential for error in the installation height of the range hood 100, the range hood 100 may not accurately detect the height of the user 300, but may instead detect whether the user 300 is above a certain plane or below a certain plane. This plane may be associated with the range hood 100. Optionally, the height detector can more accurately detect the height of the user 300, for example, to the nearest centimeter or even millimeter. Alternatively, the height detector can roughly determine whether the user 300 is above or below a certain height. Exemplarily, the height detector may include a first ranging sensor and a second ranging sensor, with the first ranging sensor disposed below the second ranging sensor. When the distance information detected by the first ranging sensor is less than a preset threshold and the distance information detected by the second ranging sensor is greater than the preset threshold, it is determined that the user 300 is in the first height range; and when the distance information detected by the first ranging sensor is less than the preset threshold and the distance information detected by the second ranging sensor is less than the preset threshold, it is determined that the user 300 is in the second height range.

[0050] The control device is also used to determine the angle at which the second cigarette collecting plate 120 pivots downwards according to the height detected by the height detector when the folding cigarette collecting plate 103 is in the open position. It is easy to understand that based on the height of the user, the approximate height of the user's eyes can be determined. Figure 4 As shown, the height of user 300' is higher than the height of user 300, which makes it more likely that their vision will be blocked. In other words, the taller the user, the smaller the angle range that the second cigarette collecting plate 120 can pivot without blocking the user's vision. As a result, the range hood 100 can more accurately avoid blocking the user's vision, and the user 300 can have a better experience. Figure 4 For example, the angle at which the second cigarette collecting plate 120 pivots downward may be positively correlated with the height, thereby avoiding blocking the sight of the user 300 .

[0051] For example, when the foldable smoke collecting plate 103 is in the open position, the angle between the first smoke collecting plate 110 and the second smoke collecting plate 120 is less than or equal to 180 degrees. As described above, the second smoke collecting plate 120 needs to prevent oil smoke from overflowing from its edge. Therefore, when the first smoke collecting plate 110 is close to horizontal (for example, the third value is not greater than 45 degrees), the angle between the second smoke collecting plate 120 and the first smoke collecting plate 110 is relatively small, for example, not greater than 135 degrees. This prevents oil smoke flowing along the second smoke collecting plate 120 from being directed away from the air inlet 102 by the second smoke collecting plate 120. When the first smoke collecting plate 110 is close to vertical (for example, the third value is greater than 45 degrees), the angle between the second smoke collecting plate 120 and the first smoke collecting plate 110 is relatively large, for example, greater than 135 degrees, or even up to 180 degrees. This allows the first and second smoke collecting plates 110, 120 as a whole to guide oil smoke toward the air inlet 102. The angle between the first smoke collecting plate 110 and the second smoke collecting plate 120 is not greater than 180 degrees, so as to avoid the direction in which the first smoke collecting plate 110 guides the oil smoke being opposite to the direction in which the second smoke collecting plate 120 guides the oil smoke, causing the oil smoke to be guided away from the air inlet 102 under the guidance of the second smoke collecting plate 120.

[0052] Exemplarily, the control device is further configured to, when the folding cigarette holding plate 103 is in the open position: when the height detected by the height detector is less than a preset height value, make the acute angle between the first cigarette holding plate 110 and the horizontal plane have a fifth value; and when the height detected by the height detector is greater than or equal to the preset height value, make the acute angle between the first cigarette holding plate 110 and the horizontal plane have a sixth value, which is greater than the fifth value. Figure 2 In the illustrated embodiment, only the second cigarette holding plate 120 can be adjusted to avoid obstructing the user's 300 line of sight. However, for users 300 taller than a certain height, even if the second cigarette holding plate 120 is pivoted to a vertical position, it will still obstruct the user's 300 line of sight. In this case, the first cigarette holding plate 110 can be pivoted so that the lower portion of the second cigarette holding plate 120 is out of the user's 300 line of sight. In this embodiment, obstructing the user's 300 line of sight can be prioritized, while smoke-holding effectiveness can be a secondary consideration.

[0053] In some exemplary embodiments, the range hood 100 may be integrated with the cooktop, for example, installed as an integrated cooktop. In this case, the distance between the range hood 100 and the cooktop 200 is predetermined. In some embodiments, the range hood 100 and the cooktop can be installed at the specified distance. However, in actual use, there are often no strict installation specifications for the distance between the range hood 100 and the cooktop, resulting in the range hood 100 being too close or too far from the cooktop. This can seriously affect the degree to which the foldable smoke trap 103 obstructs the user 300's view. For example, the range hood 100 further includes a distance sensor disposed on the range hood body 101 for detecting the height of the cooktop 200. The distance sensor may include an infrared distance sensor, a laser distance sensor, an ultrasonic distance sensor, or the like. In one specific embodiment, the control device of the range hood 100 may calculate the height difference between the user's 300 eyes and the cooktop 200 based on the height measured by the distance sensor to the cooktop 200, the height of the distance sensor to a predetermined horizontal plane, and the height of the user's 300 height above the horizontal plane as detected by the height detector. Optionally, the range hood 100 can also detect the distance between itself and the user 300. Based on the approximate distance between the user 300 and the range hood 100, and the height of the user's 300 eyes, a virtual line can be set between the point where the user's 300 eyes are located and the rear edge of the cookware 200, thereby determining the field of vision of the user 300. When the folding smoke collecting plate 103 intersects this line, it means that the folding smoke collecting plate 103 will block the user's 300 field of vision, and vice versa. The control device is also used to determine the downward pivot angle of the second smoke collecting plate 120 based on the height from the distance sensor to the cookware 200 when the folding smoke collecting plate 103 is in the open position. In this way, the user's 300 field of vision can be avoided more accurately, and on this basis, the second smoke collecting plate 120 can be controlled to achieve a better smoke collecting effect. Figure 5 As shown, for example, the angle at which the second smoke collecting plate 120 pivots downward may be positively correlated with the height from the distance measuring sensor to the cookware 200. This provides a sufficient smoke collecting range while avoiding affecting the user's 300 sight.

[0054] Exemplarily, the control device is further configured to, when the foldable smoke-collecting plate 103 is in the open position and the height from the distance sensor to the cookware 200 is greater than a preset height value, set the acute angle between the first smoke-collecting plate 110 and the horizontal plane to a seventh value; and, when the height from the distance sensor to the cookware 200 is less than or equal to the preset height value, set the acute angle between the first smoke-collecting plate 110 and the horizontal plane to an eighth value, with the eighth value being greater than the seventh value. As will be readily understood, the higher the height of the cookware 200, the smaller the slope of the line connecting the user's 300 eye point and the rear edge of the cookware 200. If the height of the user's 300 eye point remains constant (assuming the user's 300 height remains unchanged), this will cause the overall height of this virtual connecting line to increase. This significantly increases the likelihood that the second smoke-collecting plate 120 will obstruct the user's 300 line of sight. At certain pivot angles of the first smoke-collecting plate 110, even when the second smoke-collecting plate 120 is in a vertical position, obstruction of the user's 300 line of sight is unavoidable. At this time, the angle between the first smoke collecting plate 110 and the horizontal plane can be adjusted so that the first smoke collecting plate 110 and the second smoke collecting plate 120 are out of sight of the user 300. Thus, the range hood 100 can be adapted to cooking conditions with pots 200 of different heights.

[0055] Combined with reference Figure 3A and Figure 3B , when the first cigarette collecting plate 110 and the second cigarette collecting plate 120 are in a straight line, as the angle of the first cigarette collecting plate 110 changes, the edge trajectory of the second cigarette collecting plate 120 may form a sector with the predetermined axis as the center, and the radius R of this sector may be the sum of the lengths of the first cigarette collecting plate 110 and the second cigarette collecting plate 120. Optionally, the first cigarette collecting plate 110 may not be connected to the end of the second cigarette collecting plate 120. In this case, the radius of the sector may be smaller than the sum of the lengths of the first cigarette collecting plate 110 and the second cigarette collecting plate 120. The point of the edge of this sector is the farthest distance that the edge of the second cigarette collecting plate 120 can reach. When the second cigarette collecting plate 120 has a certain angle with the first cigarette collecting plate 110, when the first cigarette collecting plate 110 drives the second cigarette collecting plate 120 to pivot around the axis, the radius of the edge trajectory of the second cigarette collecting plate 120 is smaller than the above-mentioned sector radius. As Figure 3A As shown, when the included angle between the second cigarette collecting plate 120 and the first cigarette collecting plate 110 is small, the radius of the edge track of the second cigarette collecting plate 120 is R1. Figure 3B As shown, when the angle between the second smoke collecting plate 120 and the first smoke collecting plate 110 is large, the radius of the edge trajectory of the second smoke collecting plate 120 is R2, and the radius of R2 is significantly larger than the radius of R1. It is important to note that the second smoke collecting plate 120 does not extend toward the air inlet 102 of the range hood 100, thereby avoiding affecting the smoke collection effect. Therefore, when the angle between the second smoke collecting plate 120 and the first smoke collecting plate 110 is the largest, the second smoke collecting plate 120 is in a vertical position, and the first smoke collecting plate 110 is at its maximum pivotable angle.

[0056] Optionally, when the control device controls the pivoting of the first smoke collecting plate 110, if it determines that there is no user 300 in front of the range hood 100, the second smoke collecting plate 120 may not need to be controlled to adjust its angle, thereby simplifying the control logic. If a portion of the actuator is located on the first smoke collecting plate 110, the first and second smoke collecting plates 110, 120 can always extend in a straight line. If the entire actuator is located on the range hood body 101, when the first smoke collecting plate 110 moves, the second smoke collecting plate 120 may change its angle in response to the movement of the first smoke collecting plate 110. Optionally, the control device can control the first and second smoke collecting plates 110, 120 to cover a larger area centered on the cookware 200, with the lower end of the second smoke collecting plate 120 positioned as close to the cookware 200 as possible. In short, the effective pivot radius formed by the trajectory of the lower end of the second smoke collecting plate 120 can be sufficiently large to ensure effective smoke collection.

[0057] When it is determined that there is a user 300 in front of the range hood 100, in order to avoid blocking the sight of the user 300, the pivot angle of the first cigarette collecting plate 110 and the pivot angle of the second cigarette collecting plate 120 can be solved based on the following formula. Figure 6 For example, the control device can make the distance between the lower end of the first cigarette collecting plate 110 and the predetermined axis less than L. The coordinates of point P are (x0, y0), the slope of the virtual line is h / l, and the distance from point P to the virtual line can be calculated. Where x0 is the horizontal distance from the predetermined axis to the back of the range hood body 101; y0 is the vertical height from the predetermined axis to the top of the cookware 200; h is the vertical height from the eye level to the top of the cookware 200; a is the horizontal distance from the back edge of the cookware 200 to the wall; and l is the horizontal distance from the eye level to the back edge of the cookware 200. Point O can be used as the origin of the coordinate system.

[0058] When the range hood 100 is installed, the position of the predetermined axis is fixed. As mentioned above, the distance between the front surface of the range hood body 101 and the wall is approximately 35 cm. Therefore, under normal circumstances, the horizontal distance x0 from the predetermined axis to the back of the range hood body 101 is approximately 25-35 cm. The vertical height y0 from the predetermined axis to the top surface of the cookware 200 is typically 45-55 cm. The horizontal distance a from the rear edge of the cookware 200 to the wall is approximately 8-15 cm. The vertical height from the human eye to the top surface of the cookware 200 is approximately 60-70 cm. Assuming the height of the cookware remains unchanged, if the user is 165 cm tall, the vertical height from the human eye to the top surface of the cookware 200 is approximately 60 cm. If the user is 175 cm tall, the vertical height from the human eye to the top surface of the cookware 200 is approximately 70 cm.

[0059] Because the height of the cabinets usually selected when installing the stove is based on the user's height, this prevents shorter users from using a higher-positioned stove, or taller users from using a lower-positioned stove. Therefore, the vertical height from the human eye to the top surface of the pot 200 usually does not exceed the above range. As mentioned above, since the user needs to operate the stove while cooking, the user's standing position can be roughly determined due to the length of their arm and the convenience of operation. When cooking, some users may also lean forward to better observe the dish. Therefore, it can be determined that the horizontal distance from the human eye position to the rear edge of the pot 200 is usually between 50 and 70 cm. On the other hand, even if the user's eye position is farther from the rear edge of the pot 200, the smoke trap is less likely to block the user's view.

[0060] In this way, the range hood 100 can control the pivot angles of the first and second cigarette collecting plates 110 and 120 according to the installation conditions of the range hood 100 and the height of the user 300. Specifically, the working state of the cigarette collecting plate in the open position can be as follows: Figure 7-10 The schematic diagram is shown. Figure 7 and Figure 9 The position of the folding cigarette collecting plate 103 when the range hood 100 detects the presence of a user 300 in front of it, Figure 8 and Figure 10 The position of the folding cigarette collecting plate 103 when the range hood 100 detects that there is no user 300 in front of it. Figure 9 and Figure 10 In the case shown, the oil smoke concentration is greater than Figure 7 and Figure 8 The situation shown.

[0061] For example, when the foldable smoke trapping plate 103 is in the open position, the acute angle between the first smoke trapping plate 110 and the horizontal plane has a third value. During the pivoting process, the foldable smoke trapping plate 103 also has a stir-frying position. In this position, the acute angle between the first smoke trapping plate 110 and the horizontal plane has a fifth value, which is smaller than the third value. In this case, the first smoke trapping plate 110 can be extended as far forward as possible to provide the largest possible smoke trapping range. The control device can also be configured to control the foldable smoke trapping plate 103 to the stir-frying position when the oil smoke concentration exceeds a preset threshold, and to control the foldable smoke trapping plate 103 to the open position when the oil smoke concentration is less than or equal to the preset threshold. As described above, the length of the first smoke trapping plate 110 can optionally be such that, at its maximum pivot angle, it completely covers the oil smoke emission range during stir-frying. In this case, the second smoke trapping plate 120 can be controlled to be in a vertical position so that the lower end of the second smoke trapping plate 120 is as close as possible to the cookware 200, providing a better smoke trapping effect. Optionally, the length of the first smoke collecting plate 110 is not enough to completely cover the divergence range of oil smoke during stir-frying at the maximum pivot angle, and the second smoke collecting plate 120 is required to cooperate with it to cover the divergence range of oil smoke. At this time, it is necessary to control the angle between the second smoke collecting plate 120 and the vertical direction so that the sum of the length of the second smoke collecting plate 120 in the horizontal direction and the length of the first smoke collecting plate 110 in the horizontal direction can cover the divergence range of oil smoke. In some exemplary embodiments, when the first smoke collecting plate 110 is pivoted to a certain angle, it is possible that the second smoke collecting plate 120 does not affect the line of sight of the user 300 at any pivot angle. In this case, the range hood 100 can arbitrarily adjust the pivot angles of the first smoke collecting plate 110 and the second smoke collecting plate 120 within this range to provide the best smoke collecting effect without considering affecting the line of sight of the user 300. In the stir-frying position, the positions of the first smoke collecting plate 110 and the second smoke collecting plate 120 are as follows: Figure 11-12 Schematically shown, where Figure 11 The folding smoke collecting plate 103 is in the stir-frying position when the range hood 100 detects that there is a user 300 in front of it. Figure 12 The stir-frying position is where the folded smoke collecting plate 103 is when the range hood 100 detects that there is no user 300 in front of it.

[0062] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front", "back", "up", "down", "left", "right", "horizontal", "vertical", "vertical", "horizontal", "top", "bottom", etc. are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside" and "outside" refer to the inside and outside relative to the outline of each component itself.

[0063] For ease of description, area-relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the regional positional relationship between one or more components or features shown in the figures and other components or features. It should be understood that area-relative terms include not only the orientation of the components as described in the figures, but also different orientations in use or operation. For example, if the components in the drawings are inverted as a whole, the situation where the components are "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Thus, the exemplary term "above" may include both the orientations "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this document is intended to include all of these situations.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, parts, components and / or combinations thereof.

[0065] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0066] The present invention has been described through the above-described embodiments. However, it should be understood that the above-described embodiments are for illustrative and illustrative purposes only and are not intended to limit the present invention to the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments and that various variations and modifications may be made based on the teachings of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A range hood, characterized in that: include: A range hood body, wherein the range hood body is provided with an air inlet; A foldable cigarette collecting plate, the air inlet is located behind the foldable cigarette collecting plate, the foldable cigarette collecting plate is pivotally connected to the range hood body around a predetermined axis, and the foldable cigarette collecting plate has an open position and a retracted position during pivoting, the open position is located in front of the retracted position, The foldable cigarette collecting plate includes a first cigarette collecting plate and a second cigarette collecting plate, wherein the upper end of the first cigarette collecting plate is connected to the range hood body, and the lower end of the first cigarette collecting plate is connected to the second cigarette collecting plate, and the second cigarette collecting plate is pivotable in the front-to-back direction relative to the first cigarette collecting plate; A user detector, the user detector is used to detect whether there is a user in front of the range hood; as well as A control device, wherein the control device is used when the folding cigarette collecting plate is in the open position: When the user detector detects that there is no user in front of the smoke machine, the effective pivot radius of the foldable cigarette collecting plate is controlled to be a first value, where the effective pivot radius is the straight-line distance from the lower end of the second cigarette collecting plate to the predetermined axis; and When the user detector detects that there is a user in front of the range hood, the second cigarette collecting plate is controlled to pivot downward so that the effective pivot radius has a second value that is smaller than the first value.

2. The range hood according to claim 1, characterized in that: When the effective pivot radius of the folding smoke collecting plate is the first value, the horizontal distance between the lower end of the second smoke collecting plate and the back of the range hood body is greater than a first preset value, and the first preset value is greater than or equal to 35 cm.

3. The range hood according to claim 1, characterized in that: When the effective pivot radius of the folding smoke collecting plate is the second value, the horizontal distance between the lower end of the second smoke collecting plate and the back of the range hood body is greater than a second preset value, and the second preset value is greater than or equal to 35 cm.

4. The range hood according to claim 1, characterized in that: There are multiple opening positions, and when the foldable cigarette collecting plate is in different opening positions, the acute angle between the first cigarette collecting plate and the horizontal plane has different third values; The range hood also includes a fume sensor for detecting fume concentration; The control device is used to control the foldable smoke collecting plate to be in different opening positions according to the oil smoke concentration, so that the third value is negatively correlated with the oil smoke concentration.

5. The range hood according to claim 4, characterized in that: The control device is further configured to enable the acute angle between the second smoke collecting plate and the horizontal plane to have different fourth values ​​when the foldable smoke collecting plate is in different opened positions, so that the fourth value is positively correlated with the oil smoke concentration.

6. The range hood according to claim 1, characterized in that: When the foldable cigarette collecting plate is in the opened position, the acute angle between the first cigarette collecting plate and the horizontal plane has a third value; The foldable cigarette collecting plate further has a stir-frying position during the pivoting process. In the stir-frying position, the acute angle between the first cigarette collecting plate and the horizontal plane has a fifth value, which is smaller than the third value. The range hood also includes a fume sensor for detecting fume concentration. The control device is used to control the foldable smoke-collecting plate to be in the stir-frying position when the oil smoke concentration is greater than a preset threshold, and to control the foldable smoke-collecting plate to be in the open position when the oil smoke concentration is less than or equal to the preset threshold.

7. The range hood according to claim 1, characterized in that: The distance R between the lower end of the first smoke collecting plate and the predetermined axis is less than L. in, x0 is the horizontal distance from the predetermined axis to the back of the range hood body; y0 is the vertical height from the predetermined axis to the top surface of the cookware; h is the vertical height from the human eye position to the top surface of the cookware; a is the horizontal distance from the back edge of the pot to the wall; l is the horizontal distance from the human eye position to the back edge of the cookware.

8. The range hood according to claim 1, characterized in that: The range hood further comprises a height detector, which is used to detect the height of a user in front of the range hood; The control device is further configured to determine the downward pivoting angle of the second cigarette collecting plate according to the height detected by the height detector when the folding cigarette collecting plate is in the open position.

9. The range hood according to claim 8, characterized in that: The downward pivoting angle of the second cigarette collecting plate is positively correlated with the height.

10. The range hood according to claim 8, characterized in that: When the foldable cigarette collecting plate is in the opened position, the angle between the first cigarette collecting plate and the second cigarette collecting plate is less than or equal to 180 degrees.

11. The range hood according to claim 8, characterized in that: The control device is further configured to: when the foldable cigarette collecting plate is in the open position: When the height detected by the height detector is less than a preset height value, the acute angle between the first cigarette collecting plate and the horizontal plane has a fifth value; and When the height detected by the height detector is greater than or equal to the preset height value, the acute angle between the first cigarette collecting plate and the horizontal plane has a sixth value, and the sixth value is greater than the fifth value.

12. The range hood according to claim 1, characterized in that: The range hood further comprises a distance measuring sensor provided on the range hood body, the distance measuring sensor being used to detect the height of the pot. The control device is further configured to determine the downward pivoting angle of the second smoke collecting plate according to the height from the distance measuring sensor to the cookware when the foldable smoke collecting plate is in the open position.

13. The range hood according to claim 12, characterized in that: The downward pivoting angle of the second smoke collecting plate is positively correlated with the height from the distance measuring sensor to the cookware.

14. The range hood according to claim 12, characterized in that: The control device is further configured to: when the foldable cigarette collecting plate is in the open position: When the height from the distance measuring sensor to the cookware is greater than a preset height value, the acute angle between the first smoke collecting plate and the horizontal plane has a seventh value; and When the height from the distance measuring sensor to the cookware is less than or equal to the preset height value, the acute angle between the first smoke collecting plate and the horizontal plane has an eighth value, and the eighth value is greater than the seventh value.

15. The range hood according to claim 1, characterized in that: When the foldable cigarette collecting plate is in the retracted position, the first cigarette collecting plate and the second cigarette collecting plate at least partially cover the air inlet.

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