Range hood and smoke barrier motion control method thereof

Abstract

The invention relates to a range hood and a smoke barrier movement control method thereof, an oil smoke suction fan is mounted in a casing of the range hood, a smoke inlet is formed in the lower part of the casing, a smoke barrier is mounted on the front side of the smoke inlet, the smoke barrier can be driven by a turnover mechanism to turn over so as to open or close the smoke inlet, the smoke barrier comprises a first smoke barrier and a second smoke barrier, and the first smoke barrier and the second smoke barrier are arranged in the casing. The second smoke barrier can be turned over synchronously with the first smoke barrier, a distance sensor used for detecting obstacles in the movement direction of the smoke barrier is installed on the second smoke barrier, and the second smoke barrier can stretch out and draw back relative to the first smoke barrier according to information detected by the distance sensor. The second smoke barrier of the range hood can do corresponding telescopic motion according to the detected obstacle to avoid the steamer, the automation degree is high, in addition, the smoke barrier motion control method of the range hood can automatically adjust the opening angle of the smoke barrier and the air volume of the oil smoke suction fan according to the height of a user, the cooking comfort is improved, and the user experience is improved. The contradiction between the sight blocking effect and the oil smoke sucking effect is automatically solved.

Description

Technical Field

[0001] The invention relates to an oil fume purification device, in particular to a range hood and a method for controlling movement of a smoke baffle thereof. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. A centrifugal fan installed inside the range hood absorbs and exhausts oil fumes, and uses a filter to filter out some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, sucking the oil fumes under the range hood into the fan. After being accelerated by the fan, the fumes are collected by the volute and guided to be discharged outdoors.

[0003] In order to prevent the escape of oil smoke and thus improve the effect of oil smoke extraction, traditional range hoods are usually provided with a smoke baffle at the air inlet to guide the flow of oil smoke. After adding the smoke baffle, the smoke baffle can be used to prevent the escape of oil smoke. For example, the "Anti-return air mechanism of a range hood" disclosed in the Chinese invention patent application with application number 201610201000.2 (application publication number CN104776478A) includes an oil receiving bottom tank, a range hood body, a baffle, an opening and closing panel, a flue casing and a smoke baffle. The baffle is provided on the range hood body, the opening and closing panel is connected to the range hood body through a rotating shaft, a flue casing is provided above the range hood body, a cavity is provided inside the range hood body, and a smoke baffle is provided on the range hood body. The size and flip angle of the smoke baffle of the above-mentioned existing range hoods are fixed. Therefore, when in working state, the smoke collection area is also fixed, resulting in little difference in the oil fume extraction effect. In this case, the oil fume extraction effect is usually improved by increasing the rotation speed of the fan system, which will cause energy waste. At the same time, the width and flip angle of the smoke baffle must be designed to take into account the field of vision of the cook. However, after the width and flip angle are determined, the height samples of all users are not taken into account, and the width and flip angle of the smoke baffle cannot be automatically adjusted according to the height of the user to ensure the user's excellent cooking field of vision.

[0004] In addition, the smoke baffle of a general range hood is fixed in size and angle for the same machine to facilitate production, improve versatility and reduce the types of materials. However, when the machine is installed in different users' homes, the installation height will be different to match the cabinets, and the heights of steamers used in different users' homes will be different (such as 2-layer, 3-layer, etc.). Due to the changes in the height of the hanging machine and the height of the users, some people may feel obviously depressed during use because the smoke baffle blocks part of their sight, or the smoke baffle may hit the pot when it is opened. Therefore, it is necessary to avoid hitting the pot during the opening and closing process and adjust the angle according to the height of the person or the installation height to adapt to the viewing angle. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a range hood with a retractable and rotatable smoke baffle in view of the above-mentioned existing technical status.

[0006] The second technical problem to be solved by the present invention is to provide a control method for the range hood according to the above-mentioned prior art status.

[0007] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a range hood, comprising a casing, a range hood fan is installed inside the casing, a smoke inlet is opened at the lower part of the casing, a smoke baffle is installed on the front side of the smoke inlet, and the smoke baffle can be flipped under the drive of a flipping mechanism to open or close the smoke inlet, characterized in that: the smoke baffle includes a first smoke baffle and a second smoke baffle installed on the first smoke baffle, the second smoke baffle can be flipped synchronously with the first smoke baffle, a distance sensor for detecting obstacles in the movement direction of the smoke baffle is installed on the second smoke baffle, and the second smoke baffle can make telescopic movements relative to the first smoke baffle according to information detected by the distance sensor.

[0008] Preferably, the first smoke shield is arranged on the outer side of the second smoke shield, and under the drive of the driving mechanism, the second smoke shield can extend downward to the lower edge of the first smoke shield, and can be retracted upward until the lower edge of the second smoke shield is flush or substantially flush with the lower edge of the first smoke shield. In this way, when the second smoke shield is driven by the driving mechanism to extend forward from the first smoke shield, the smoke shielding effect can be improved, and when it is retracted backward, the size of the smoke shield can be shortened to avoid obstacles or improve the user's field of vision.

[0009] The driving mechanism may have various structures. Preferably, the driving mechanism is a linear motor installed between the first baffle plate and the second smoke baffle plate, and the second smoke baffle plate slides up and down relative to the first smoke baffle plate under the drive of the linear motor.

[0010] In order to enable the smoke shield to sense obstacles within different ranges, the lower edge of the second smoke shield is installed with a first distance sensor and a second distance sensor for detecting obstacles in the movement direction of the smoke shield. The first distance sensor and the second distance sensor have different sensing angles.

[0011] Further preferably, the first distance sensor and the second distance sensor are arranged side by side, and the first distance sensor is arranged on the inner side of the second distance sensor.

[0012] As a preferred embodiment of any of the above schemes, the casing includes an upper box body and a smoke collecting hood installed at the bottom of the upper box body, the bottom of the smoke collecting hood has an inclined surface extending obliquely downward from front to rear, and the smoke inlet and smoke baffle are arranged on the inclined surface.

[0013] As a preferred solution, a camera for identifying the height information of the user during the cooking process is installed at the front of the housing.

[0014] Further preferably, a rotatable distance sensor for identifying the height information of the user during the cooking process is installed on the front of the housing.

[0015] The technical solution adopted by the present invention to solve the above second technical problem is: a method for controlling the movement of a smoke baffle of a range hood, characterized in that: the control method is applied to the range hood, and the on / off smoke baffle detection and movement control of the control method include the following steps:

[0016] S1. Open or close the smoke damper;

[0017] S2, the first distance sensor and the second distance sensor acquire sensor information corresponding to the movement direction;

[0018] S3, calculating the obstacle distance d in the corresponding motion direction;

[0019] S4, judging whether d>d1 is established, d1 is a reference value;

[0020] If yes, the smoke shield is flipped open and the process proceeds to step S5;

[0021] If not, the second smoke shield is retracted relative to the first smoke shield; and it is determined whether it is retracted to the shortest position, if so, it remains stationary and returns to step S4; if not, it continues to be retracted and returns to step S4;

[0022] S5, judging whether the smoke shield is turned over in place;

[0023] If yes, the second smoke baffle is extended, and then the process goes to step S6;

[0024] If not, return to step S2;

[0025] S6. End this round of adjustment.

[0026] Further preferably, the calibration mode of the control method comprises the following steps:

[0027] S101, entering the position and air volume calibration mode, and inputting the camera height h0 of the range hood in the current on-hook state;

[0028] S102, the smoke baffle of the range hood is opened to the maximum angle, and the range hood fan is operated at the default gear;

[0029] S103, the camera takes a picture including the user's head;

[0030] S104, calculating the height deviation value h1 of the user's head relative to the camera installation plane based on the image, where a height above the camera is positive and a height below the camera is negative, and determining the user's height H=h0+h1;

[0031] S105, according to the current hanging height and the user's height information, look up a table to determine the appropriate opening angle of the smoke shield;

[0032] S106, the flip mechanism adjusts the smoke shield to a preliminarily set angle, and checks whether the user is satisfied. If not, the user is prompted to adjust the extension distance of the second smoke shield to achieve a specific viewing angle;

[0033] S107, according to the determined opening angle and extension distance of the smoke shield, a table is looked up to determine the air volume button value or gear current value for the user;

[0034] S108, storing the user's angle picture together with the user information and the air volume button value according to the correlation relationship, so as to facilitate the start of the query;

[0035] S109, exit calibration mode and enter normal operation.

[0036] Further preferably, the smoke baffle movement control method of the range hood comprises the following steps:

[0037] S201, start the range hood;

[0038] S202, the camera obtains camera information;

[0039] S203, comparing the current user;

[0040] S204, determining whether there is calibration data obtained in the calibration mode;

[0041] If yes, the corresponding angle and air volume information are read and driven to execute, and then the process goes to step S205;

[0042] If not, the calibration mode is entered and the process returns to step S204 to continue the determination;

[0043] S205, the camera takes pictures and compares the position information of the smoke shield;

[0044] S206, determining whether the smoke baffle is fully opened;

[0045] If yes, then end this round of adjustment and then return to step S202;

[0046] If not, return to step S205.

[0047] Further preferably, a calibration mode of a range hood smoke baffle motion control method comprises the following steps:

[0048] S301, entering the position and air volume calibration mode, inputting the height h0 of the rotatable distance sensor of the range hood in the current on-hook state;

[0049] S302, the smoke baffle of the range hood is opened to the maximum angle, and the range hood fan operates at the default gear;

[0050] S303, measuring the height difference of the user and the offset value relative to the rotatable distance sensor;

[0051] S304, calculating the user's height H=h0+h1;

[0052] S305, according to the current hanging height and the user's height information, look up a table to determine the appropriate opening angle of the smoke shield;

[0053] S306, the flip mechanism adjusts the smoke shield to a preliminarily set angle, and checks whether the user is satisfied. If not, the user is prompted to adjust the extension distance of the second smoke shield to achieve a specific viewing angle;

[0054] S307, according to the determined opening angle and extension distance of the smoke shield, a table is looked up to determine the air volume button value or gear current value for the user;

[0055] S308, storing the user's angle picture together with the user information and the air volume button value according to the correlation relationship, so as to facilitate the start of the query;

[0056] S309, exit calibration mode and enter normal operation.

[0057] Further preferably, the smoke baffle movement control method of the range hood comprises the following steps:

[0058] S401, range hood start;

[0059] S402, the rotatable distance sensor obtains the user's height information through a subroutine;

[0060] S403, comparing current height;

[0061] S404, determining whether there is calibration data obtained in the calibration mode;

[0062] If yes, the corresponding angle and air volume information are read and driven to execute, and then the process goes to step S405;

[0063] If not, the calibration mode is entered and the process returns to step S404 to continue the determination;

[0064] S405, the camera takes pictures and compares the position information of the smoke shield;

[0065] S406, determining whether the smoke baffle is fully opened;

[0066] If yes, then end this round of adjustment and then return to step S4402;

[0067] If not, return to step S405.

[0068] Further preferably, the subroutine of obtaining the user's height information in step S402 specifically includes the following steps:

[0069] S501, detection starts;

[0070] S502, the rotatable distance sensor is activated;

[0071] S503, the rotatable distance sensor rotates;

[0072] S504: Whether the detection within the rotation range is completed;

[0073] If yes, proceed to step S505;

[0074] If not, wait and then return to step S503;

[0075] S505, determining whether there is data within the effective distance;

[0076] If yes, then obtain the distance data L of the highest point in the segment of the data within the effective distance and the corresponding relative horizontal angle α; then proceed to step S506;

[0077] If not, the user is not in the cooking area, and then returns to step S502;

[0078] S506, calculating the horizontal height difference d1=L×sinα of the user's head relative to the sensor;

[0079] S507, read the sensor installation height h0 from the memory, and calculate the user's height H=h0+d1;

[0080] S508: Feedback the height value or the user's absence information.

[0081] Compared with the existing design, the advantages of the present invention are: the smoke baffle of the range hood includes a first smoke baffle and a second smoke baffle installed on the first smoke baffle, the second smoke baffle can be flipped synchronously with the first smoke baffle, and the distance sensor installed on the second smoke baffle can be used to detect obstacles in the movement direction of the smoke baffle, so that the second smoke baffle can make corresponding telescopic movements according to the detected obstacles to avoid the steamer, and the degree of automation is high. In addition, the smoke baffle movement control method of the range hood can automatically adjust the opening angle, telescopic distance and air volume of the smoke exhaust fan of the smoke baffle according to the user's height, thereby improving cooking comfort and automatically solving the contradiction between blocking the line of sight and the smoke exhaust effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 It is a structural schematic diagram of a range hood according to an embodiment of the present invention (in a shutdown state with the second smoke baffle extended);

[0083] Figure 2 It is a structural schematic diagram of a range hood according to an embodiment of the present invention (in a shutdown state with the second smoke baffle retracted);

[0084] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0085] Figure 4 It is a structural schematic diagram of the range hood according to an embodiment of the present invention (in the powered-on state with the second smoke baffle retracted);

[0086] Figure 5 It is a structural schematic diagram of a range hood according to an embodiment of the present invention (in a powered-on state with the second smoke baffle extended);

[0087] Figure 6 A schematic diagram of the structure of a smoke baffle according to an embodiment of the present invention;

[0088] Figure 7 for Figure 6 A magnified schematic diagram of part B;

[0089] Figure 8 It is a structural schematic diagram of an existing range hood in which a pot is knocked over when the smoke baffle is opened;

[0090] Fig. 9 A schematic diagram of the structure of a range hood according to an embodiment of the present invention for preventing a smoke baffle from hitting a pot;

[0091] Fig.10 This is a schematic structural diagram of a range hood smoke shield extending out to block part of the field of vision according to an embodiment of the present invention;

[0092] Fig.11 It is a structural schematic diagram of the range hood according to the embodiment of the present invention, in which the smoke baffle of the range hood is retracted to increase the field of view;

[0093] Fig.12 A flow chart of detection and motion control of the smoke baffle of a range hood on / off according to an embodiment of the present invention;

[0094] Fig.13 is a flow chart of a calibration mode of a range hood according to an embodiment of the present invention;

[0095] Fig.14 is a flow chart of the use process of the range hood according to an embodiment of the present invention;

[0096] Fig.15 is a flow chart of another calibration mode of the range hood according to an embodiment of the present invention;

[0097] Fig.16 is a flow chart of another use process of the range hood according to an embodiment of the present invention;

[0098] Fig.17 Flow chart of the subroutine for obtaining user height information according to an embodiment of the present invention. DETAILED DESCRIPTION

[0099] The present invention is further described in detail below with reference to the accompanying drawings.

[0100] like Figures 1 to 7 As shown, the range hood of this embodiment includes a casing 1, a range hood fan (not shown) is installed inside the casing 1, the casing 1 includes an upper box body 11 and a smoke collecting hood 12 installed at the bottom of the upper box body 11, the bottom of the smoke collecting hood 12 has an inclined surface extending obliquely downward from front to rear, a smoke inlet 2 is opened on the inclined surface, a smoke baffle 3 is installed on the front side of the smoke inlet 2, and the smoke baffle 3 can be flipped under the drive of the flip mechanism 4 to open or close the smoke inlet 2.

[0101] The smoke baffle 3 of this embodiment includes a first smoke baffle 31 and a second smoke baffle 32 installed on the first smoke baffle 31, and the second smoke baffle 32 can be turned over synchronously with the first smoke baffle 31. The first smoke baffle 31 is arranged on the outer side of the second smoke baffle 32. Under the drive of the driving mechanism, the second smoke baffle 32 can extend downward to the lower edge of the first smoke baffle 31, and can be retracted upward until the lower edge of the second smoke baffle 32 is flush or approximately flush with the lower edge of the first smoke baffle 31. The driving mechanism of this embodiment is a linear motor 5 installed between the first baffle and the second smoke baffle 32. Under the drive of the linear motor 5, the second smoke baffle 32 slides up and down relative to the first smoke baffle 31.

[0102] A distance sensor for detecting obstacles in the moving direction of the smoke shield 3 is installed on the second smoke shield 32. The second smoke shield 32 can perform telescopic movement relative to the first smoke shield 31 according to the information detected by the distance sensor. Specifically, the distance sensor includes a first distance sensor 61 and a second distance sensor 62 installed on the lower edge of the second smoke shield 32. The first distance sensor 61 and the second distance sensor 62 are arranged side by side, and the first distance sensor 61 is arranged on the inner side of the second distance sensor 62. The first distance sensor 61 and the second distance sensor 62 have different sensing angles.

[0103] like Figure 8 As shown, the existing range hood has the phenomenon that the high pot 8 is hit during the opening process of the smoke baffle.

[0104] like Fig. 9 As shown, during the opening process of the smoke shield 3, when the first distance sensor 61 detects the existence of the high pot 8, the second smoke shield 32 retracts first, and after the smoke shield 3 as a whole passes over the high pot 8, the second smoke shield 32 extends to the specified position.

[0105] like Fig.10 As shown, a camera 7 is installed on the front side of the smoke hood 12 to identify the height information of the user during cooking. The height difference d1=L×sinα between the head of the user 9 and the camera 7 is calculated. If the installation height of the camera 7 is h0, the height of the user 9 H=h0+d1. For users 9 of different heights, the change in the height of the machine and the height may cause some people to feel obviously depressed during use because the smoke shield 3 blocks part of their sight, such as Fig.10 The user viewing angle is 30°. In addition, a rotatable distance sensor can be used instead of a camera to detect the height of the cooking user and adjust the smoke shield during cooking to reduce line of sight obstruction.

[0106] like Fig.11 As shown, under the premise that the opening angle of the smoke baffle 3 remains unchanged, the second smoke baffle 32 is Fig.10 On the basis of retracting a certain distance upward, the viewing angle of the user 9 can be increased, such as increased to 32°. However, at this time, since the size of the smoke shield 3 becomes smaller, the shortening of the smoke shield 3 will cause a loss of negative pressure coverage. In order to avoid the fume suction effect, the air volume of the fume suction fan needs to be increased.

[0107] like Fig.12 As shown, the smoke baffle detection and motion control of the range hood on / off in this embodiment includes the following steps:

[0108] S1, open or close the smoke baffle 3;

[0109] S2, the first distance sensor 61 and the second distance sensor 62 obtain sensor information corresponding to the movement direction;

[0110] S3, calculating the obstacle distance d in the corresponding motion direction;

[0111] S4, judging whether d>d1 is established, d1 is a reference value;

[0112] If yes, the smoke baffle 3 is flipped open, and then the process goes to step S5;

[0113] If not, the second smoke baffle 32 is retracted relative to the first smoke baffle 31; and it is determined whether it is retracted to the shortest position. If so, it remains stationary and returns to step S4; if not, it continues to be retracted and returns to step S4;

[0114] S5, judging whether the smoke baffle 3 is turned over in place;

[0115] If yes, the second smoke baffle 32 is extended, and then the process goes to step S6;

[0116] If not, return to step S2;

[0117] S6. End this round of adjustment.

[0118] like Fig.13 As shown, the range hood camera recognizes the height of the user 9, and the smoke baffle 3 opens a specific angle or retracts a specific distance according to the height information of the user 9. The user needs to calibrate for the first time, and the calibration mode includes the following steps:

[0119] S101, entering the position and air volume calibration mode, inputting the height h0 of the camera 7 when the range hood is currently on-hook;

[0120] S102, the smoke baffle 3 of the range hood is opened to the maximum angle, and the range hood fan operates at the default gear;

[0121] S103, the camera 7 takes a picture including the user's head;

[0122] S104, calculating the height deviation value h1 of the user's head relative to the installation plane of the camera 7 based on the image, where a height above the camera 7 is positive and a height below the camera 7 is negative, and determining the user's height H=h0+h1;

[0123] S105, according to the current hanging height and the user's height information, look up a table to determine the appropriate opening angle of the smoke shield 3;

[0124] S106, the flip mechanism 4 adjusts the smoke shield 3 to a preliminarily set angle, and checks whether the user is satisfied. If not, the user is prompted to adjust the extension distance of the second smoke shield 32 to achieve a specific viewing angle;

[0125] S107, according to the determined opening angle and extension distance of the smoke shield 3, a table is looked up to determine the air volume button value or gear current value for the user;

[0126] S108, storing the user's angle picture together with the user information and the air volume button value according to the correlation relationship, so as to facilitate the start of the query;

[0127] S109, exit calibration mode and enter normal operation.

[0128] like Fig.14 As shown, the operation process of the control method is as follows:

[0129] S201, start the range hood;

[0130] S202, camera 7 obtains camera 7 information;

[0131] S203, comparing the current user;

[0132] S204, determining whether there is calibration data obtained in the calibration mode;

[0133] If yes, the corresponding angle and air volume information are read and driven to execute, and then the process goes to step S205;

[0134] If not, the calibration mode is entered and the process returns to step S204 to continue the determination;

[0135] S205, the camera 7 takes a photo to compare the position information of the smoke shield 3;

[0136] S206, judging whether the smoke baffle 3 is fully opened;

[0137] If yes, then end this round of adjustment and then return to step S202;

[0138] If not, return to step S205.

[0139] In addition, if a rotatable distance sensor is used instead of a camera to identify the height information of the user 9 during the cooking process, the smoke shield 3 is opened to a specific angle or extended to a specific distance according to the height information of the user 9. Fig.15 As shown, the calibration mode of the control method includes the following steps:

[0140] S301, entering the position and air volume calibration mode, inputting the height h0 of the rotatable distance sensor of the range hood in the current on-hook state;

[0141] S302, the smoke baffle 3 of the range hood is opened to the maximum angle, and the range hood fan operates at the default gear;

[0142] S303, measuring the height difference of the user and the offset value relative to the rotatable distance sensor;

[0143] S304, calculating the user's height H=h0+h1;

[0144] S305, according to the current hanging height and the user's height information, look up a table to determine the appropriate opening angle of the smoke shield 3;

[0145] S306, the flip mechanism 4 adjusts the smoke shield 3 to a preliminarily set angle, and checks whether the user is satisfied. If not, the user is prompted to adjust the extension distance of the second smoke shield 32 to achieve a specific viewing angle;

[0146] S307, according to the determined opening angle and extension distance of the smoke shield 3, a table is looked up to determine the air volume button value or gear current value for the user;

[0147] S308, storing the user's angle picture together with the user information and the air volume button value according to the correlation relationship, so as to facilitate the start of the query;

[0148] S309, exit calibration mode and enter normal operation.

[0149] like Fig.16 As shown, the operation process of the control method is as follows:

[0150] S401, range hood start;

[0151] S402, the rotatable distance sensor obtains the user's height information through a subroutine;

[0152] S403, comparing current height;

[0153] S404, determining whether there is calibration data obtained in the calibration mode;

[0154] If yes, the corresponding angle and air volume information are read and driven to execute, and then the process goes to step S405;

[0155] If not, the calibration mode is entered and the process returns to step S404 to continue the determination;

[0156] S405, the camera 7 takes a photo to compare the position information of the smoke baffle 3;

[0157] S406, judging whether the smoke baffle 3 is fully opened;

[0158] If yes, then end this round of adjustment and then return to step S4402;

[0159] If not, return to step S405.

[0160] like Fig.17 As shown, the subroutine of step S402 for obtaining the user's height information specifically includes the following steps:

[0161] S501, detection starts;

[0162] S502, the rotatable distance sensor is activated;

[0163] S503, the rotatable distance sensor rotates;

[0164] S504: Whether the detection within the rotation range is completed;

[0165] If yes, proceed to step S505;

[0166] If not, wait and then return to step S503;

[0167] S505, determining whether there is data within the effective distance;

[0168] If yes, then obtain the distance data L of the highest point in the segment of the data within the effective distance and the corresponding relative horizontal angle α; then proceed to step S506;

[0169] If not, the user is not in the cooking area, and then returns to step S502;

[0170] S506, calculating the horizontal height difference d1=L×sinα of the user's head relative to the sensor;

[0171] S507, read the sensor installation height h0 from the memory, and calculate the user's height H=h0+d1;

[0172] S508: Feedback the height value or the user's absence information.

[0173] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A range hood, comprising a housing (1), a range hood fan installed inside the housing (1), a smoke inlet (2) opened at the lower part of the housing (1), a smoke baffle (3) installed at the front side of the smoke inlet (2), the smoke baffle (3) being able to perform a flipping movement under the drive of a flipping mechanism (4) to open or close the smoke inlet (2), characterized in that: The smoke shield (3) comprises a first smoke shield (31) and a second smoke shield (32) mounted on the first smoke shield (31); the second smoke shield (32) can be turned over synchronously with the first smoke shield (31); a distance sensor for detecting obstacles in the moving direction of the smoke shield (3) is mounted on the second smoke shield (32); the second smoke shield (32) can perform telescopic movement relative to the first smoke shield (31) according to information detected by the distance sensor.

2. The range hood according to claim 1, characterized in that: The first smoke shield (31) is arranged on the outer side surface of the second smoke shield (32); when driven by the driving mechanism, the second smoke shield (32) can extend downward to the lower edge of the first smoke shield (31), and can retract upward until the lower edge of the second smoke shield (32) is flush with the lower edge of the first smoke shield (31).

3. The range hood according to claim 2, characterized in that: The driving mechanism is a linear motor (5) installed between the first baffle plate and the second smoke baffle plate (32); the second smoke baffle plate (32) slides up and down relative to the first smoke baffle plate (31) under the drive of the linear motor (5).

4. The range hood according to claim 1, characterized in that: The distance sensor comprises a first distance sensor (61) and a second distance sensor (62) which are installed on the lower edge of the second smoke baffle (32); the first distance sensor (61) and the second distance sensor (62) have different sensing angles.

5. The range hood according to claim 4, characterized in that: The first distance sensor (61) and the second distance sensor (62) are arranged side by side, and the first distance sensor (61) is arranged on the inner side of the second distance sensor (62).

6. The range hood according to any one of claims 1 to 5, characterized in that: The casing (1) comprises an upper box body (11) and a smoke collecting hood (12) mounted on the bottom of the upper box body (11); the bottom of the smoke collecting hood (12) has an inclined surface extending obliquely downward from front to rear; the smoke inlet (2) and the smoke baffle (3) are arranged on the inclined surface.

7. The range hood according to claim 1, characterized in that: A camera (7) for identifying the height information of the user during the cooking process is installed on the front of the housing (1).

8. The range hood according to claim 7, characterized in that: A rotatable distance sensor for identifying the height information of a user during the cooking process is installed on the front of the housing (1).

9. A method for controlling the movement of a smoke baffle (3) of a range hood, characterized in that: The control method is applied to the range hood according to claim 4 or 5, and the detection and motion control of the smoke baffle (3) for opening and closing the range hood in the control method comprises the following steps: S1, opening or closing the smoke baffle (3); S2, a first distance sensor (61) and a second distance sensor (62) acquire sensor information corresponding to a movement direction; S3, calculating the obstacle distance d in the corresponding motion direction; S4, judging whether d>d1 is established, d1 is a reference value; If yes, the smoke baffle (3) is flipped open and the process proceeds to step S5; If not, the second smoke baffle (32) is retracted relative to the first smoke baffle (31); and it is determined whether it is retracted to the shortest position. If so, it remains stationary and returns to step S4; if not, it continues to be retracted and returns to step S4; S5, judging whether the smoke baffle (3) is turned over in place; If yes, the second smoke baffle (32) is extended, and then the process goes to step S6; If not, return to step S2; S6. End this round of adjustment.

10. A method for controlling the movement of a smoke baffle (3) of a range hood, characterized in that: The control method is applied to the range hood according to claim 7, and the calibration mode of the control method comprises the following steps: S101, entering the position and air volume calibration mode, inputting the height h0 of the camera (7) in the current on-hook state of the range hood; S102, the smoke baffle (3) of the range hood is opened to the maximum angle, and the range hood fan is operated at the default gear; S103, the camera (7) takes a picture including the user's head; S104, calculating the height deviation value h1 of the user's head relative to the installation plane of the camera (7) based on the image, where a height above the camera (7) is positive and a height below the camera (7) is negative, and determining the user's height H=h0+h1; S105, according to the current hanging height and the user's height information, look up a table to determine the appropriate opening angle of the smoke shield (3); S106, the flip mechanism (4) adjusts the smoke shield (3) to a preliminarily set angle, and checks whether the user is satisfied with the adjustment. If the user is not satisfied, the user is prompted to adjust the extension distance of the second smoke shield (32) to achieve a specific viewing angle; S107, according to the determined opening angle and extension distance of the smoke shield (3), a table is consulted to determine the key values ​​of each air volume or the current value of each gear position for the user; S108, storing the user's angle picture together with the user information and the air volume button value according to the correlation relationship, so as to facilitate the start of the query; S109, exit calibration mode and enter normal operation.

11. The method for controlling the movement of the smoke baffle (3) of a range hood according to claim 10, characterized in that The steps include: S201, start the range hood; S202, the camera (7) obtains the camera (7) information; S203, comparing the current user; S204, determining whether there is calibration data obtained in the calibration mode; If yes, the corresponding angle and air volume information are read and driven to execute, and then the process goes to step S205; If not, the calibration mode is entered and the process returns to step S204 to continue the determination; S205, the camera (7) takes a photo and compares the position information of the smoke shield (3); S206, judging whether the smoke baffle (3) is fully opened; If yes, then end this round of adjustment and then return to step S202; If not, return to step S205.

12. A method for controlling the movement of a smoke baffle (3) of a range hood, characterized in that: The control method is applied to the range hood according to claim 8, and the calibration mode of the control method comprises the following steps: S301, entering the position and air volume calibration mode, inputting the height h0 of the rotatable distance sensor of the range hood in the current on-hook state; S302, the smoke baffle (3) of the range hood is opened to the maximum angle, and the range hood fan is operated at the default gear; S303, measuring the height difference of the user and the offset value relative to the rotatable distance sensor; S304, calculating the user's height H=h0+h1; S305, according to the current hanging height and the user's height information, look up a table to determine the appropriate opening angle of the smoke shield (3); S306, the flip mechanism (4) adjusts the smoke shield (3) to a preliminarily set angle, and checks whether the user is satisfied with the adjustment. If the user is not satisfied, the user is prompted to adjust the extension distance of the second smoke shield (32) to achieve a specific viewing angle; S307, according to the determined opening angle and extension distance of the smoke shield (3), a table is consulted to determine the key values ​​of each air volume or the current value of each gear position for the user; S308, storing the user's angle picture together with the user information and the air volume button value according to the correlation relationship, so as to facilitate the start of the query; S309, exit calibration mode and enter normal operation.

13. The method for controlling the movement of the smoke baffle (3) of a range hood according to claim 12, characterized in that The steps include: S401, range hood start; S402, the rotatable distance sensor obtains the user's height information through a subroutine; S403, comparing current height; S404, determining whether there is calibration data obtained in the calibration mode; If yes, the corresponding angle and air volume information are read and driven to execute, and then the process goes to step S405; If not, the calibration mode is entered and the process returns to step S404 to continue the determination; S405, the camera (7) takes a photo and compares the position information of the smoke shield (3); S406, judging whether the smoke baffle (3) is fully opened; If yes, then end this round of adjustment and then return to step S4402; If not, return to step S405.

14. The method for controlling the movement of the smoke baffle (3) of a range hood according to claim 13, characterized in that: The subroutine of step S402 for obtaining the user's height information specifically includes the following steps: S501, detection starts; S502, the rotatable distance sensor is activated; S503, the rotatable distance sensor rotates; S504: Whether the detection within the rotation range is completed; If yes, proceed to step S505; If not, wait and then return to step S503; S505, determining whether there is data within the effective distance; If yes, then obtain the distance data L of the highest point in the segment of the data within the effective distance and the corresponding relative horizontal angle α; then proceed to step S506; If not, the user is not in the cooking area, and then returns to step S502; S506, calculating the horizontal height difference d1=L×sinα of the user's head relative to the sensor; S507, read the sensor installation height h0 from the memory, and calculate the user's height H=h0+d1; S508: Feedback the height value or the user's absence information.

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