A range hood and a control method thereof

Abstract

This invention discloses a range hood and its control method. The range hood includes a housing with an air inlet on the front side. It also includes a smoke baffle and a motion mechanism that drives the smoke baffle to rotate relative to the housing, thereby opening and closing the air inlet. The motion mechanism includes a main motor, a rocker arm fixed to the smoke baffle, and a connecting bracket fixed within the housing. The connecting bracket is fixed to a connecting shaft, and the rocker arm is rotatably connected to the connecting bracket via the connecting shaft. The portion of the rocker arm connected to the connecting shaft is clamped axially along the connecting shaft by the connecting bracket. The motion mechanism further includes a damping adjustment mechanism for adjusting the rotational damping between the rocker arm and the connecting shaft, thereby allowing the smoke baffle to operate at a constant speed. The damping adjustment mechanism includes an adjusting element disposed on the connecting shaft and an auxiliary motor for driving the adjusting element closer to or further from the connecting bracket, thereby changing the rotational damping between the rocker arm and the connecting shaft by altering the force between the connecting bracket and the rocker arm.

Description

Technical Field

[0001] This invention relates to an oil fume purification device, and more particularly to a range hood and a control method for the range hood. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. Generally, range hoods include top-mounted and side-mounted types. Side-mounted range hoods utilize the principle of vortex air pressure to absorb most of the cooking fumes close to the stove in an arc, reducing adverse health effects. Furthermore, since the power source is closer to the stove, it doesn't significantly reduce the suction efficiency.

[0003] To achieve better smoke collection, a flip-up smoke baffle is usually installed at the air inlet of a side-draft range hood. The baffle opens when the range hood is working and closes when it is turned off. Commonly used drive mechanisms for smoke baffles are electric push rods or motors. The baffle's rotating shaft generally has no damping or very low constant damping. Taking a motor-driven mechanism as an example, in this type of range hood, when the smoke baffle opens, the first half (from the start of opening until the baffle reaches its vertical position, where its center of gravity is at its lowest point) is driven by the baffle's gravity, resulting in a faster motor speed and a faster opening speed. In the second half (from the baffle's vertical position to its maximum opening angle), the motor drives the baffle, and the opening speed decreases. Therefore, the baffle's speed is unstable throughout the entire operation. The first half of the process generates significant noise due to the high motor speed, while the second half sees reduced noise due to the lower motor speed. This variation in noise level during the movement of the smoke baffle deteriorates the sound quality.

[0004] For undamped rotating shafts, when the smoke baffle reaches the vertical position, its driving force changes from gravity to motor drive, and the motor changes from passive to active drive. At this point, due to the backlash in the transmission mechanism, the smoke baffle will experience noticeable jerking, negatively impacting the user experience. This phenomenon is caused by the large and inconsistent load transmitted from the smoke baffle to the motor.

[0005] Therefore, there is also a type of range hood, such as the flip drive mechanism and range hood disclosed in Chinese Patent Application No. 202020081713.6. The flip drive mechanism is used to drive the flip panel to flip, and includes: a drive assembly, including a drive motor and a gear reducer, the shaft of the drive motor being connected to the input shaft of the gear reducer; a hinge assembly, which is connected to the output shaft of the gear reducer and the flip panel respectively, and the drive assembly drives the flip panel to flip through the hinge assembly; and a damping element, configured to apply a damping torque to the output shaft to prevent the flip panel from flipping outward.

[0006] In this type of drive mechanism, the damping force applied by the damping component (shim) during the operation of the smoke baffle remains constant, which can reduce the jerking phenomenon during operation. However, the load applied to the motor by the smoke baffle varies during operation, meaning the total load is variable. Therefore, it is impossible to achieve a constant speed for the smoke baffle during operation and thus improve the effect of reducing motor noise. Furthermore, it cannot achieve arbitrary hovering. To achieve arbitrary hovering, the shim damping must be greater than the point of maximum load during the operation of the smoke baffle. This results in a large damping torque throughout the entire operation of the smoke baffle, leading to either very low smoke baffle speed or the need for a motor with very high torque, resulting in low efficiency. Summary of the Invention

[0007] The first technical problem to be solved by the present invention is to provide a range hood that achieves a constant speed of the baffle plate during operation, in order to address the shortcomings of the prior art.

[0008] The second technical problem to be solved by the present invention is to provide a control method for the above-mentioned range hood.

[0009] The technical solution adopted by the present invention to solve the first technical problem mentioned above is as follows: a range hood, including a housing, wherein an air inlet is provided on the front side of the housing; the range hood further includes:

[0010] Smoke baffle; and

[0011] The motion mechanism drives the smoke baffle to rotate relative to the housing, thereby opening and closing the air inlet;

[0012] The motion mechanism includes a main motor, a rocker arm fixed to the smoke baffle, and a connecting bracket fixed inside the housing. The connecting bracket is fixed to a connecting shaft, and the rocker arm is rotatably connected to the connecting bracket via the connecting shaft. The portion of the rocker arm connected to the connecting shaft is clamped by the connecting bracket along the axial direction of the connecting shaft. Its characteristic is that:

[0013] The motion mechanism further includes a damping adjustment mechanism for adjusting the rotational damping between the rocker arm and the connecting shaft, thereby enabling the smoke baffle to operate at a constant speed. The damping adjustment mechanism includes:

[0014] Adjusting element, mounted on connecting shaft; and

[0015] An auxiliary motor is used to drive the adjusting component closer to or further away from the connecting bracket, thereby changing the rotational damping between the rocker arm and the connecting shaft by altering the force between the connecting bracket and the rocker arm.

[0016] By setting a damping adjustment mechanism, a constant load can be output, ensuring that the speed of the smoke baffle remains constant during operation. This allows the main motor to run at a relatively low speed, improving sound quality and eliminating the jerking problem of the smoke baffle in the vertical position. Furthermore, as long as the rotational damping is set to a constant value greater than the load of the main motor, the smoke baffle can be suspended at any position regardless of the type of motor driven.

[0017] Furthermore, the rocker arm is sleeved on the connecting shaft and rotatably connected to the connecting shaft;

[0018] When the adjusting member presses against the connecting bracket, the rotational damping between the rocker arm and the connecting shaft increases; when the adjusting member moves away from the connecting bracket, the rotational damping between the rocker arm and the connecting shaft decreases.

[0019] Preferably, to facilitate the linear movement of the adjusting component driven by the auxiliary motor, the adjusting component is a nut, the connecting shaft is threadedly connected to the adjusting component, and the auxiliary motor drives the adjusting component to rotate, thereby causing the adjusting component to move linearly along the axial direction of the connecting shaft, thus moving closer to or away from the connecting bracket.

[0020] To facilitate better clamping of the connecting bracket and the rocker arm, the motion mechanism also includes two spacer sleeves, which are arranged on both sides of the connection between the rocker arm and the connecting shaft. There are also two connecting brackets, which are respectively arranged on the side of the spacer sleeves that are far apart from each other, thereby clamping the spacer sleeves toward the rocker arm.

[0021] To facilitate the adjustment of the force applied to the connecting bracket by the adjusting member, the motion mechanism further includes a first washer, a second washer, and an elastic member. The adjusting member, the first washer, the elastic member, and the second washer are sequentially sleeved on the outer periphery of the connecting shaft along the axial direction of the connecting shaft, and the first washer and the second washer clamp the elastic member between them. The first washer is located close to the adjusting member, and the connecting bracket is located on the side of the second washer away from the first washer.

[0022] Preferably, the elastic element is a wave-shaped washer or a spring washer.

[0023] Preferably, the adjusting component is a nut, the connecting shaft is threadedly connected to the adjusting component, and the auxiliary motor drives the adjusting component to rotate, causing the adjusting component to move linearly along the axial direction of the connecting shaft, thereby moving closer to or away from the connecting bracket. The mating parts between the connecting shaft and the first and second shims are both flat shaft portions, which can prevent the first shims, the second shims, and the connecting shaft from rotating with the adjusting component when the adjusting component rotates, thus avoiding the introduction of other load fluctuations.

[0024] To facilitate quantitative adjustment of rotational damping, the auxiliary motor also includes an output shaft, a rotor, a pressure sensor, and a motor housing. The rotor is housed inside the motor housing, and the output shaft rotates synchronously with the rotor. The output shaft extends from the end of the motor housing near the connecting shaft and can be connected to the adjusting component. The pressure sensor is mounted on the rotor and abuts against the end of the motor housing through which the output shaft extends.

[0025] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a control method for a range hood as described above, characterized by comprising the following steps:

[0026] 1) Upon powering on, the main motor rotates forward, preparing to drive the smoke baffle to open;

[0027] Alternatively, when the machine is turned off, the main motor reverses to prepare to drive the smoke baffle to close.

[0028] 2) Detect the current rotation angle φ of the main motor. z ;

[0029] 3) Query and retrieve the pre-stored data related to φ z corresponding φ zi , and with φ zi The corresponding auxiliary motor rotor pressure F i and auxiliary motor rotation angle φ fi ;

[0030] 4) The auxiliary motor rotates at the corresponding angle φ fi ;

[0031] 5) The current pressure F detected by the pressure sensor of the auxiliary motor s The result of the query is φ zi Corresponding F i Compare, if F s ≠F i Proceed to step 6), if F s =F i If so, it will detect whether the motion mechanism has reached the correct position and shut it off after reaching the correct position;

[0032] 6) Continue to judge F s With F i The size is adjusted by adjusting the rotational damping by adjusting the angle of the auxiliary motor based on the comparison results. After adjustment, the motion mechanism is checked to see if it has reached the correct position, and then shut off after reaching the correct position.

[0033] In step 6), if F s <F i Proceed to step 6.1), if F s >F i If so, proceed to step 6.2);

[0034] 6.1) The auxiliary motor rotates at a preset reference adjustment angle Δβ, causing the adjusting component to move toward the connecting bracket, thereby increasing the rotational damping;

[0035] 6.2) The auxiliary motor rotates at a preset reference adjustment angle Δβ, causing the adjustment component to move toward the connecting bracket, thereby reducing rotational damping.

[0036] Furthermore, it also includes step 7), which follows step 6), to obtain the current rotation angle φ of the main motor again. z and make it with φ zi Compare, if φ z <φ zi Then return to step 5), if φ z ≥φ zi (Go back to step 2).

[0037] Further, in step 5), if F s =F i Then proceed to step 8):

[0038] Check if the main motor is stalled. If yes, proceed to step 9). If no, the auxiliary motor does not operate, and return to step 7.

[0039] 9) Determine if the current rotation angle of the main motor is in place. If it is, turn off the main motor. If not, report an error and turn off the main motor.

[0040] Furthermore, if the main motor is turned off directly during the operation of the motion mechanism, the smoke baffle will hover in any position.

[0041] Furthermore, in step 3), the pre-stored φ zi F i and φ fi The method of obtaining it is:

[0042] First, the entire process of the main motor driving the smoke baffle to move is discretized into n parts. Therefore, each time the main motor rotates to a certain angle φ... zi The corresponding main motor load T will be obtained. zi Thus, the rotation angle of the main rotating motor is divided into φ. z1 φ z1 ……φ zi ……φ zn The main motor load T zi Divided into T z1 T z1 ...T zi ...T zn , i = 1 to n;

[0043] Then, based on the required constant load, and according to the formula: constant load = rotational damping + T zi The test determined the rotational damping required by the auxiliary motor at different rotation angles of the main motor, with each rotational damping corresponding to a rotor pressure F of the auxiliary motor. i and auxiliary motor rotation angle φ fi Thus, the rotor pressure of the auxiliary motor is divided into F1, F1...F i ...F n The rotation angle of the auxiliary motor is divided into φ f1 φ f1 ……φ fi ……φ fn .

[0044] Further, in step 3), if φ z Falling into φ zi-1 and φ zi Within the range between, then take φ. zi This is the current rotation angle of the main motor.

[0045] Compared with the prior art, the advantages of the present invention are: by setting a damping adjustment mechanism, a constant load can be output, so that the speed of the smoke baffle is constant during operation, the main motor can run at a relatively low speed, the sound quality is improved, and the problem of the smoke baffle jerking in the vertical position can be eliminated. Moreover, as long as the rotational damping is set to a constant value greater than the load of the main motor, the smoke baffle can be suspended at any position regardless of the type of motor drive. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of a range hood according to an embodiment of the present invention;

[0047] Figure 2 This is a cross-sectional view of a range hood according to an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the smoke baffle and its movement mechanism of a range hood according to an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the movement mechanism of the smoke baffle of the range hood according to an embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the smoke baffle and part of the moving mechanism of the range hood according to an embodiment of the present invention;

[0051] Figure 6 This is an exploded structural diagram of the first fixed bracket, rotating shaft assembly, and rocker arm of the motion mechanism of the range hood according to an embodiment of the present invention;

[0052] Figure 7 for Figure 6 A schematic diagram of the rotating shaft assembly in the motion mechanism;

[0053] Figure 8 for Figure 7 An exploded view of the rotating shaft assembly;

[0054] Figure 9 This is a cross-sectional view of the auxiliary motor and rotating shaft assembly of the motion mechanism of the range hood according to an embodiment of the present invention;

[0055] Figure 10 This is a schematic diagram of the auxiliary motor hidden housing of the motion mechanism of the range hood according to an embodiment of the present invention;

[0056] Figure 11 This is a control flowchart of a range hood according to an embodiment of the present invention. Detailed Implementation

[0057] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0058] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0059] See Figures 1-6 A range hood, specifically a side-suction type, includes a housing 1 and a fan (not shown), the fan being partially or entirely housed within the housing 1. An air inlet 11 is provided on the front side of the housing 1, and a smoke baffle 2 is provided at the air inlet 11. The smoke baffle 2 can rotate relative to the housing 1, thereby opening and closing the air inlet 11.

[0060] The range hood also includes a motion mechanism for driving the smoke baffle 2 to flip, comprising a main motor 31, a transmission mechanism, a first fixed bracket 33, an auxiliary motor 34, a second fixed bracket 35, and an adjusting component 36. Both the first fixed bracket 33 and the second fixed bracket 35 are fixedly installed within the housing 1. The main motor 31 can be mounted on the first fixed bracket 33, while the auxiliary motor 34 can be mounted on the second fixed bracket 35. The first fixed bracket 33 includes a generally U-shaped bracket body 331 and a connecting bracket 332 extending from the bracket body 331. The main motor 31 is mounted on the bracket body 331. The main motor 31 is a motor with a stroke detection mechanism, which can employ existing technologies, such as the combination of a commonly used Hall effect sensor and a magnet, to detect the rotation angle output by the main motor 31.

[0061] The transmission mechanism includes a crank 321, a connecting rod 322, a rocker arm 323, and a connecting shaft assembly 324. The output end of the main motor 31 extends into the bracket body 331. One end of the crank 321 can be connected to the output end of the main motor 31, allowing the crank 321 to be driven to rotate by the main motor 31. The other end of the crank 321 is rotatably connected to one end of the connecting rod 322, and the other end of the connecting rod 322 is rotatably connected to the rocker arm 323. A smoke baffle bracket 21 is provided on the side of the smoke baffle 2 facing inwards from the housing 1, and the rocker arm 323 is also fixed to the smoke baffle 2 via the smoke baffle bracket 21. Alternatively, the transmission mechanism can retain only the connecting rod 322 and the rocker arm 323, or only the rocker arm 323.

[0062] The aforementioned connecting shaft assembly 324 is mounted on the first fixed bracket 33, see [reference]. Figures 4 to 10 The assembly includes a connecting shaft 3241, a first washer 3242, a second washer 3243, an elastic element 3244, and a spacer sleeve 3246. The connecting shaft 3241 is connected to a connecting bracket 332 of the first fixed bracket 33, and its axis extends in the left-right direction. There may be two connecting brackets 332, which are arranged at intervals along the axial direction of the connecting shaft 3241. The rocker arm 323 is rotatably connected to the connecting shaft 3241, and the aforementioned spacer sleeves 3246 are respectively provided on both sides of the connection position between the rocker arm 323 and the connecting shaft 3241 to clamp the rocker arm 323 in the axial direction. The two connecting brackets 332 are respectively arranged on the side of the spacer sleeves 3246 that are far away from each other, thereby clamping the spacer sleeves 3246 toward the rocker arm 323. Adjusting member 36, first washer 3242, elastic member 3244, and second washer 3243 are sequentially sleeved on the outer periphery of connecting shaft 3241 along its axial direction, and the first washer 3242 and second washer 3243 clamp the elastic member 3244 between them. The elastic member 3244 can be a wave-shaped washer, a spring washer, etc. The adjusting member 36 is located at the end of connecting shaft 3241 near the auxiliary motor 34, and is preferably a nut.

[0063] The output motor 34 and the adjusting member 36 constitute a damping adjustment mechanism for adjusting the rotational damping between the rocker arm 323 and the connecting shaft 3241. The auxiliary motor 34 has an output shaft 341, which is connected to the adjusting member 36 and can rotate synchronously. The end of the connecting shaft 3241 that mates with the adjusting member 36 has an external thread 3247, thereby making the connecting shaft 3241 and the adjusting member 36 threadedly connected. The mating points of the connecting shaft 3241 with the connecting bracket 332 of the first fixed bracket 33, the first washer 3242 and the second washer 3243 are all flat shaft portions 3248 (not pure cylinders), which can prevent the first washer 3242, the second washer 3243 and the connecting shaft 3241 from rotating with the adjusting member 36 when the adjusting member 36 rotates, thus avoiding the introduction of other load fluctuations. The adjusting member 36 may not be a nut, as long as the output of the auxiliary motor 34 can be transmitted to the adjusting member 36 to make it move along the axial direction of the connecting shaft 3241. For example, auxiliary motor 34 can work with lead screws, nuts, etc. to output linear motion.

[0064] The auxiliary motor 34 also includes a rotor 342, a pressure sensor 343, and a motor housing 344. The rotor 342 is disposed inside the motor housing 344. The output shaft 341 rotates synchronously with the rotor 342. The output shaft 341 extends out of the motor housing 344 near the connecting shaft assembly 324 and can be connected to the adjusting member 36. The pressure sensor 343 is disposed on the rotor 342 and abuts against the end of the motor housing 344 through which the output shaft 341 extends.

[0065] When the auxiliary motor 34 rotates in the forward direction, the adjusting member 36 pushes the first shim 3242 to compress the elastic member 3244, then compresses the second shim 3243, and finally compresses the connecting bracket 332 of the first fixed bracket 33. The first fixed bracket 33 and the spacer sleeve 3246 together press the rocker arm 323, increasing the frictional resistance between the rocker arm 323 and the connecting shaft 3241 when the rocker arm 323 rotates, forming rotational damping T. At this time, because the auxiliary motor 34 is fixed, the axial movement of the rotor 342 will press the pressure sensor 343 towards the end of the motor housing 344.

[0066] The above-mentioned mechanism constitutes the active end of the motion mechanism. The motion mechanism also includes a driven end, which has only a first fixed bracket 33, a rocker arm 323 and a connecting shaft assembly 324 (wherein, the connecting shaft assembly 324 may not include the adjusting member 36).

[0067] The auxiliary motor 34 drives the adjusting component 36 to rotate, which in turn compresses the elastic component 3244 and the connecting bracket 332, generating rotational damping T. The smoke baffle 2 transmits the main motor load T to the main motor 31. z It is necessary to ensure that the rotational damping T + the main motor load T z=Constant load, thus ensuring that the smoke baffle 2 operates at a constant speed during opening and closing. The rotational damping T can be set to be greater than the main motor load T. z A constant value, thus the smoke baffle 2 can be suspended at any position.

[0068] Considering safety and user experience, the operating speed of the motion mechanism of the smoke baffle 2 is generally slow, and the inertial force during the movement of the smoke baffle 2 can be ignored. Referring to Table 1, the entire process of the main motor 31 driving the smoke baffle 2 is discretized into n parts. Therefore, for each rotation of the main motor 31 by an angle φ zi The corresponding main motor load T will be obtained. i After designing the entire motion mechanism, the load curve of the main motor 31 can be obtained through CREO simulation. Based on this, it can be decomposed into n parts (discrete according to the required accuracy; the higher the accuracy requirement, the larger n is; the lower the accuracy requirement, the smaller n is). After the design is completed, based on the required constant load (corresponding to the running speed of the smoke baffle 2), multiple experiments can be conducted to test the rotational damping T required by the auxiliary motor 34 at different rotation angles of the main motor 31. Simultaneously, since the rotor 342 of the auxiliary motor 34 also compresses the pressure sensor 343, it outputs a pressure signal. That is, one rotational damping T corresponds to one rotor pressure F of the auxiliary motor 34, and one rotation angle φ of the auxiliary motor 34. f .

[0069] See Table 1 below, which shows the parameters obtained after dispersing the entire movement process of the smoke baffle 2.

[0070] <![CDATA[Main motor load T z > <![CDATA[T z1 ]]> <![CDATA[T z2 ]]> …… <![CDATA[T zi ]]> …… <![CDATA[T zn ]]> Rotational damping T Auxiliary motor rotor pressure F <![CDATA[F1]]> <![CDATA[F2]]> …… <![CDATA[F i ]]> …… <![CDATA[F n ]]> <![CDATA[Rotation angle φ of the auxiliary motor f > <![CDATA[φ f1 ]]> <![CDATA[φ f2 ]]> …… <![CDATA[φ fi ]]> …… <![CDATA[φ fn ]]>

[0071] Table 1 Discrete parameters of each drive mechanism

[0072] See Figure 11 The control method for the range hood of the present invention includes the following steps:

[0073] 1) Upon powering on, the main motor 31 rotates forward accordingly, preparing to drive the smoke baffle 2 to open;

[0074] Alternatively, when the machine is turned off, the main motor 31 will reverse accordingly, preparing to drive the smoke baffle 2 to close.

[0075] 2) The stroke detection mechanism of the main motor 31 obtains the current rotation angle φ of the main motor 31. z The data is transmitted to the central processing unit of the range hood's control module.

[0076] 3) The central processing unit queries the pre-set array table (i.e., Table 1, which can pre-set several array tables with different constant load sizes, such as slow, medium, and fast (the speed can be customized by the user), thereby controlling the opening speed of the smoke baffle, i.e., the user can select multiple smoke baffle operating speeds) and first queries φ. z Which angle range does it fall into, for example, φ? zi-1 and φ zi Between, take φ zi As the current rotation angle of the main motor 31 (i.e., taking the upward value), the corresponding rotor pressure F of the auxiliary motor 34 can then be retrieved. i and auxiliary motor rotation angle φ fi ;

[0077] 4) Based on the results obtained from the lookup array table, the auxiliary motor 34 rotates by the corresponding angle φ. fi ;

[0078] 5) The current pressure F detected by the pressure sensor 343 of the auxiliary motor 34 s F obtained from the query i Compare, if F s ≠F i Proceed to step 6), if F s =F i Then proceed to step 8);

[0079] 6) Continue to judge F s With F i The magnitude of F is determined by adjusting the rotational damping T based on the comparison results. After adjusting the rotational damping T once, proceed to step 7). The specific adjustment method is as follows: If F s <F i Proceed to step 6.1), if F s >F i If so, proceed to step 6.2);

[0080] 6.1) The auxiliary motor 34 rotates forward (or reverses) at a preset reference adjustment angle Δβ (which can be set according to the required accuracy), causing the adjusting member 36 to move towards the elastic member 3244, thereby increasing the rotational damping T;

[0081] 6.2) The auxiliary motor 34 reverses (or can rotate forward) by a preset reference adjustment angle Δβ, thereby reducing the rotational damping T;

[0082] 7) Obtain the current rotation angle φ of the main motor 31 again through the stroke detection mechanism. z and make it with φ zi Compare, if φ z <φ ziThis indicates that after the adjustment steps in the previous steps, the rotation angle of the main motor 31 is still φz. i-1 and φ zi If the condition is such that the rotational damping T is not met, then return to step 5), that is, continue to finely adjust the rotational damping T; if φ z ≥φ zi This indicates that after the adjustment steps in the previous steps, the rotation angle of the main motor 31 is no longer φ. zi-1 and φ zi Then return to step 2);

[0083] 8) If F s =F i If the main motor 31 has reached its position, then check whether the main motor 31 has reached its position. If it has, but it is still uncertain whether the motion mechanism has reached its position, because there may be other factors that cause the motion mechanism to be stuck, then proceed to step 9); if not, it means that the main motor 31 has not reached its position, then the auxiliary motor 34 will not move, and return to step 7).

[0084] Optionally, the main motor 31 can be checked to see if its current operating current is greater than or equal to the stall current. The current of the main motor 31 can be checked using conventional methods. The stall current is the current value determined after the main motor 31 is manufactured. If it is, it means that the main motor 31 has stalled and has reached the operating position. If not, it means that the main motor 31 has not stalled.

[0085] 9) Determine whether the current rotation angle of the main motor 31 is in place, i.e., φ z Is it equal to φ? zn If yes, it means the motion mechanism has been in place, and the next step is to directly shut down the main motor 31. If no, it means the motion mechanism has not been in place, indicating that it was blocked by other factors during operation (such as encountering the user). The next step is to report an error and shut down the main motor 31.

[0086] Whether the main motor 31 of the motion mechanism has reached the correct position can also be determined by the limit switch signal.

[0087] During the movement of the above-mentioned motion mechanism, the hovering function can be directly activated, that is, the main motor 31 can be directly turned off, so that the smoke baffle 2 can be stopped at any position. Therefore, the user can stop the smoke baffle 2 at any position according to the needs of the cooking scenario.

Claims

1. A control method for a range hood, the range hood comprising a housing (1), wherein an air inlet (11) is provided on the front side of the housing (1); the range hood further comprising: Smoke baffle (2); as well as The motion mechanism drives the smoke baffle (2) to flip relative to the housing (1), thereby opening and closing the air inlet (11); The motion mechanism includes a main motor (31), a rocker arm (323) fixed to the smoke baffle (2), and a connecting bracket (332) fixed inside the housing (1). The connecting bracket (332) is fixed to a connecting shaft (3241), and the rocker arm (323) is rotatably connected to the connecting bracket (332) via the connecting shaft (3241). The part of the rocker arm (323) connected to the connecting shaft (3241) is clamped by the connecting bracket (332) along the axial direction of the connecting shaft (3241). The characteristic feature is that: The motion mechanism further includes a damping adjustment mechanism for adjusting the rotational damping between the rocker arm (323) and the connecting shaft (3241) so that the smoke baffle (2) runs at a constant speed. The damping adjustment mechanism includes: Adjusting element (36) is provided on connecting shaft (3241); and An auxiliary motor (34) is used to drive the adjusting member (36) to move closer to or away from the connecting bracket (332), thereby changing the rotational damping between the rocker arm (323) and the connecting shaft (3241) by changing the force between the connecting bracket (332) and the rocker arm (323); the auxiliary motor (34) also includes an output shaft (341), a rotor (342), a pressure sensor (343) and a motor housing (344), the rotor (342) is disposed inside the motor housing (344), the output shaft (341) rotates synchronously with the rotor (342), the output shaft (341) protrudes from the end of the motor housing (344) near the connecting shaft (3241) and can be connected to the adjusting member (36), the pressure sensor (343) is disposed on the rotor (342) and abuts against the end of the motor housing (344) through which the output shaft (341) protrudes; The control method includes the following steps: 1) When the machine is turned on, the main motor (31) rotates forward, ready to drive the smoke baffle (2) to open; Alternatively, when the machine is turned off, the main motor (31) reverses to prepare to drive the smoke baffle (2) to close. 2) Detect the current rotation angle φ of the main motor (31) z ; 3) Query and retrieve the pre-stored data related to φ z corresponding φ zi , and with φ zi Corresponding auxiliary motor (34) rotor pressure F i and auxiliary motor rotation angle φ fi ; 4) The auxiliary motor (34) rotates by the corresponding angle φ fi ; 5) The current pressure F detected by the pressure sensor (343) of the auxiliary motor (34) s The result of the query is φ zi Corresponding F i Compare, if F s ≠F i Proceed to step 6), if F s =F i If so, it will detect whether the motion mechanism has reached the correct position and shut it off after reaching the correct position; 6) Continue to judge F s With F i The size is adjusted according to the comparison result, and the rotational damping is adjusted by adjusting the rotation angle of the auxiliary motor (34). After adjustment, the motion mechanism is checked to see if it is in place, and then it is turned off after it is in place.

2. The control method for a range hood according to claim 1, characterized in that: In step 6), if F s <F i Proceed to step 6.1), if F s >F i If so, proceed to step 6.2); 6.1) The auxiliary motor (34) rotates at a preset reference adjustment angle Δβ, causing the adjustment component (36) to move toward the connecting bracket (332), thereby increasing the rotational damping; 6.2) The auxiliary motor (34) rotates at a preset reference adjustment angle Δβ, causing the adjustment component (36) to move toward the connecting bracket (332), thereby reducing rotational damping.

3. The control method for a range hood according to claim 2, characterized in that: It also includes step 7), which follows step 6), to obtain the current rotation angle φ of the main motor (31) again. z and make it with φ zi Compare, if φ z <φ zi Then return to step 5), if φ z ≥φ zi (Go back to step 2).

4. The control method for a range hood according to claim 3, characterized in that: In step 5), if F s =F i Then proceed to step 8): Check if the main motor (31) is stalled. If yes, proceed to step 9). If no, the auxiliary motor (34) does not operate and return to step 7. 9) Determine whether the current rotation angle of the main motor (31) is in place. If yes, turn off the main motor (31). If no, report an error and turn off the main motor (31).

5. The control method for a range hood according to claim 1, characterized in that: If the main motor (31) is turned off directly during the operation of the motion mechanism, the smoke baffle (2) will be suspended in any position.

6. The control method for a range hood according to claim 1, characterized in that: In step 3), the pre-stored φ zi F i and φ fi The method of obtaining it is: First, the entire process of the main motor (31) driving the smoke baffle (2) to move is discretized into n parts. Therefore, the main motor (31) rotates to an angle φ. zi The corresponding main motor load T will be obtained. zi Thus, the rotation angle component of the rotating main motor (31) is obtained as φ. z1 φ z1 ……φ zi ……φ zn The main motor load T zi Divided into T z1 T z1 ...T zi ...T zn , i = 1 ~ n; Then, based on the required constant load, and according to the formula: constant load = rotational damping + T zi The test determined the rotational damping required by the auxiliary motor (34) at different rotation angles of the main motor (31), with each rotational damping corresponding to an auxiliary motor rotor pressure F. i and auxiliary motor rotation angle φ fi Thus, the rotor pressure of the auxiliary motor is divided into F1, F1...F i ...F n The rotation angle of the auxiliary motor is divided into φ f1 φ f1 ……φ fi ……φ fn .

7. The control method for a range hood according to claim 6, characterized in that: In step 3), if φ z Falling into φ zi-1 and φ zi Within the range between, then take φ. zi This serves as the rotation angle of the current main motor (31).

8. The control method for a range hood according to claim 1, characterized in that: The rocker arm (323) is sleeved on the connecting shaft (3241) and rotatably connected to the connecting shaft (3241); When the adjusting member (36) presses against the connecting bracket (332), the rotational damping between the rocker arm (323) and the connecting shaft (3241) increases; when the adjusting member (36) moves away from the connecting bracket (332), the rotational damping between the rocker arm (323) and the connecting shaft (3241) decreases.

9. The control method for a range hood according to claim 8, characterized in that: The adjusting member (36) is a nut, the connecting shaft (3241) is threadedly connected to the adjusting member (36), and the auxiliary motor (34) drives the adjusting member (36) to rotate, thereby causing the adjusting member (36) to move linearly along the axial direction of the connecting shaft (3241), thus moving closer to or away from the connecting bracket (332).

10. The control method for a range hood according to claim 1, characterized in that: The motion mechanism also includes two spacer sleeves (3246), which are arranged on both sides of the connection between the rocker arm (323) and the connecting shaft (3241). There are also two connecting brackets (332), which are respectively arranged on the side of the spacer sleeves (3246) that are far apart from each other, so as to clamp the spacer sleeves (3246) to the rocker arm (323).

11. The control method for a range hood according to claim 1, characterized in that: The motion mechanism further includes a first washer (3242), a second washer (3243), and an elastic element (3244). The adjusting element (36), the first washer (3242), the elastic element (3244), and the second washer (3243) are sequentially sleeved on the outer periphery of the connecting shaft (3241) along the axial direction. The first washer (3242) and the second washer (3243) clamp the elastic element (3244) between them. The first washer (3242) is located close to the adjusting element (36), and the connecting bracket (332) is located on the side of the second washer (3243) away from the first washer (3242).

12. The control method for a range hood according to claim 11, characterized in that: The elastic element (3244) is a wave-shaped gasket or a spring pad.

13. The control method for a range hood according to claim 11, characterized in that: The adjusting member (36) is a nut, the connecting shaft (3241) is threadedly connected to the adjusting member (36), and the auxiliary motor (34) drives the adjusting member (36) to rotate, thereby causing the adjusting member (36) to move linearly along the axial direction of the connecting shaft (3241), thus moving closer to or away from the connecting bracket (332). The mating points between the connecting shaft (3241) and the first washer (3242) and the second washer (3243) are both flat shaft portions (3248).

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