A range hood and its control method

Abstract

This invention relates to a range hood and its control method. The range hood includes: a housing with an air inlet on its front side; a baffle plate constrained relative to the housing and positioned in front of the air inlet to open or close the air inlet; a drive mechanism; and a transmission mechanism, the power input end of which is driven and connected to the drive mechanism, and the power output end of which is driven and connected to the baffle plate. Driven by the drive mechanism, the transmission mechanism drives the baffle plate to rotate. The invention is characterized by further including: a magnetorheological damper, comprising a cylinder containing a magnetorheological element, a piston rod constrained within the cylinder in a reciprocating manner, and a coil wound around the piston rod. The free end of the piston rod extends from a first end of the cylinder and is rotatably connected to the transmission mechanism, and the second end of the cylinder is rotatably connected to the inner wall of the housing. This range hood controls the operating speed of the baffle plate by changing the current of the magnetorheological damper, preventing the entire machine from shaking due to excessive speed of the baffle plate.

Description

TECHNICAL FIELD

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

[0002] The existing near-suction type range hood or European-near integrated type range hood is the mainstream product on the market, and its basic form is to remove oil fume by opening the smoke baffle. The opening and closing of the smoke baffle is realized by a drive motion system such as an electric push rod or a worm gear reducer motor.

[0003] The opening and closing speed of the smoke baffle of the existing range hood is basically determined by the power of the drive motor and the form of the motion mechanism. Once the design scheme of the drive motor and the motion mechanism is determined, the motion speed of the smoke baffle is basically determined. When the motor output torque (speed) selected at the design time does not match the actual operation of the smoke baffle motion mechanism, it will cause problems such as jamming, shaking, loose closing, large motor gear box noise, etc. during the opening and closing process of the smoke baffle. To solve this technical problem, a kind of performance test method of motion mechanism of smoke baffle of range hood is disclosed in Chinese patent application No. CN 201811115630.8 (application publication No. CN 110939958A), which can monitor the torque and speed required during the opening and closing process of the smoke baffle in real time. Through the reverse design principle, relevant data is provided for parameter selection in motor design, so that the design parameters of the motor are more matched with the actual operation, thereby effectively avoiding the shaking, jamming, etc. of the smoke baffle during the opening and closing process, reducing the noise during operation, improving the stability of motor operation, and also can be used for detecting the operation failure of the smoke baffle.

[0004] Although the above method can solve the problems such as shaking and jamming of the smoke baffle during the opening and closing process, the above method still has the following use limitations: due to the influence of environmental temperature and other external factors, such as different seasons or regions, the viscosity of the oil in the drive motor reducer of the motion mechanism will change, thereby causing the output power to fluctuate, and the opening speed of the smoke baffle of the range hood may also be different, which may affect the user experience. Therefore, further improvement is needed for the existing technology. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a range hood capable of keeping the opening speed of the smoke baffle stable to avoid the shaking of the whole machine caused by the too fast opening speed of the smoke baffle.

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

[0007] The present application solves the first technical problem by adopting the technical scheme of a range hood, comprising:

[0008] a housing having an air inlet on a front side thereof;

[0009] a smoke baffle constrained in front of the air inlet in a rotatable manner relative to the housing, so as to open or close the air inlet;

[0010] a driving mechanism located behind the smoke baffle;

[0011] a transmission mechanism located behind the smoke baffle, a power input end of the transmission mechanism being connected to the driving mechanism for driving, and a power output end of the transmission mechanism being connected to the smoke baffle for driving, so that the smoke baffle is driven to rotate by the transmission mechanism under the driving of the driving mechanism;

[0012] characterized in that it further comprises:

[0013] a magneto-rheological damper comprising a cylinder containing a magneto-rheological body, a piston rod constrained in the cylinder in a reciprocating manner, and a coil wound around the piston rod, a free end of the piston rod extending from a first end of the cylinder and being connected to the transmission mechanism for rotation, and a second end of the cylinder being connected to an inner wall of the housing for rotation.

[0014] In order to facilitate winding of the coil, at least one winding drum for winding the coil is arranged in the cylinder, and the winding drum is sleeved on the piston rod.

[0015] In order to play a sealing role and prevent the magneto-rheological body from leaking out, the first end of the cylinder is open, and a first sealing ring constrained on the inner wall of the cylinder is arranged at the opening, the first sealing ring being sleeved on the piston rod, and the first sealing ring being capable of being in sealing connection with the piston rod during reciprocating movement of the piston rod.

[0016] In order to further improve the sealing performance, a second sealing ring constrained on the inner wall of the cylinder is further arranged at a position adjacent to the second end of the cylinder, the second sealing ring being sleeved on the piston rod, and the second sealing ring being capable of being in sealing connection with the piston rod during reciprocating movement of the piston rod.

[0017] In order to realize the opening of the smoke baffle, the transmission mechanism comprises a transmission frame and a connecting rod, the transmission frame comprises a first connecting arm and a second connecting arm arranged oppositely, the connecting rod is located between the first connecting arm and the second connecting arm, the first end of the first connecting arm and the first end of the second connecting arm are connected and connected with the power output shaft of the driving mechanism, the second end of the first connecting arm and the second end of the second connecting arm are respectively locked or unlocked with the connecting rod through adjusting devices, and the second end of the first connecting arm and the second end of the second connecting arm can move forward and backward relative to the connecting rod when the second end of the first connecting arm and the second end of the second connecting arm are unlocked; the front end of the connecting rod is rotationally connected with the back of the smoke baffle, and the rear end of the connecting rod is rotationally connected with the free end of the piston rod.

[0018] In order to realize the opening angle adjustment and angle locking of the smoke baffle, the adjusting device is an adjusting shaft, the connecting rod is provided with a long hole for inserting the adjusting shaft along the length direction, at least one positioning hole is arranged on the long hole, the adjusting shaft can move along the extension direction of the long hole, and has the following two states: in the first state, the adjusting shaft is inserted into the positioning hole so that the transmission frame and the connecting rod are relatively locked; in the second state, the adjusting shaft is separated from the positioning hole so that the transmission frame and the connecting rod are unlocked.

[0019] In order to realize the installation of the driving mechanism, the housing is further provided with a mounting frame located behind the smoke baffle and used for fixedly mounting the driving mechanism, the mounting frame comprises two side plates arranged oppositely and forming a containing space therebetween, the two side plates are respectively provided with a through hole for penetrating the power output shaft of the driving mechanism, and the first end of the first connecting arm and the first end of the second connecting arm are arranged in the containing space and fixed on the power output shaft of the driving mechanism.

[0020] The technical scheme adopted by the present application to solve the second technical problem is: a control method of the above-mentioned range hood, the driving mechanism is a driving motor, and the control method comprises the following steps:

[0021] Step 1: turn on the range hood, collect the output power change curve of the driving motor during the process that the smoke baffle is opened from the beginning to the complete opening, and mark it as the first output power curve Pa;

[0022] Step 2: turn off the range hood, collect the output power change curve of the driving motor during the process that the smoke baffle is closed from the beginning to the complete closing, and mark it as the second output power curve Pb;

[0023] Step 3: according to the same method in steps 1 and 2, the first output power curve Pa and the second output power curve Pb corresponding to n range hoods are respectively collected, the average value of the n first output power curves Pa is obtained, and the first output power average curve is obtained. The average value of the n second output power curves Pb is obtained, and the second output power average curve is obtained.

[0024] Step 4, collecting the output power of the driving motor in real time;

[0025] Step 5, judging whether the current output power Pi of the driving motor is 0, if yes, turning to Step 4; if no, turning to Step 6;

[0026] Step 6, comparing the current output power Pi of the driving motor with the output power value at the same time in the first output power average curve and the output power value at the same time in the second output power average curve respectively;

[0027] Step 7, judging that the current smoke baffle is in an abnormal state or a normal state according to the comparison result, and performing the following operations according to different working states:

[0028] if the current smoke baffle is in the normal state, updating and storing the input current of the magneto-rheological damper in the action state of the smoke baffle, and ending, wherein the action state of the smoke baffle includes the first action state corresponding to the process that the smoke baffle is opened from the beginning to the complete opening in Step 1 and the second action state corresponding to the process that the smoke baffle is closed from the beginning to the complete closing in Step 2;

[0029] if the current smoke baffle is in the abnormal state, adjusting the input current of the magneto-rheological damper, and turning to Step 8;

[0030] Step 8, obtaining the output power of the driving motor after the input current of the magneto-rheological damper is adjusted, comparing the output power with the output power average curve in the action state of the smoke baffle, and turning to Step 7.

[0031] In the above scheme, the abnormal state of the smoke baffle in Step 7 includes an abnormal opening state and an abnormal closing state, and the normal state of the smoke baffle includes a normal opening state and a normal closing state.

[0032] To realize the working state judgment of the smoke baffle, the comparison in Step 6 is specifically as follows:

[0033] Step 6-1, judging whether is less than a first preset value ε1, if yes, determining that the current smoke baffle is in the normal opening state; if no, turning to Step 6-2;

[0034] Step 6-2, judging whether is less than a second preset value ε2, if yes, turning to determine that the current smoke baffle is in the normal closing state; if no, turning to Step 6-3;

[0035] ​​Step 6-3, judging whether less than If yes, it is determined that the current smoke baffle is in an abnormal opening state; if no, it is determined that the current smoke baffle is in an abnormal closing state.

[0036] To solve the abnormal opening of the smoke baffle, if the current smoke baffle is in the abnormal opening state, the control logic in steps 7 and 8 is specifically as follows:

[0037] Step 7-1, increasing or decreasing the input current of the magnetorheological damper, recording the adjusted input current of the magnetorheological damper as Ia, and judging whether Ia is within a preset range [Ia min , Ia max ], Ia min being a preset minimum value of the input current of the magnetorheological damper when the smoke baffle is in the first action state, and Ia max being a preset maximum value of the input current of the magnetorheological damper when the smoke baffle is in the first action state, if yes, proceeding to step 7-2; if no, fault alarm, and ending.

[0038] Step 7-2, judging whether the difference between the output power Pi' of the driving motor after the current adjustment of the magnetorheological damper and is less than a first preset value ε1, if yes, it is determined that the current smoke baffle is in a normal opening state, and the current input current Ia of the magnetorheological damper is stored; if no, proceeding to step 7-1.

[0039] To solve the abnormal closing of the smoke baffle, if the current smoke baffle is in the abnormal closing state, the control logic in steps 7 and 8 is specifically as follows:

[0040] Step 7-a, increasing or decreasing the input current of the magnetorheological damper, recording the adjusted input current of the magnetorheological damper as Ib, and judging whether Ib is within a preset range [Ib min , Ib max ], Ib min being a preset minimum value of the input current of the magnetorheological damper when the smoke baffle is in the second action state, and Ib max being a preset maximum value of the input current of the magnetorheological damper when the smoke baffle is in the second action state, if yes, proceeding to step 7-b; if no, fault alarm, and ending.

[0041] Step 7-b, judging whether the difference between the output power Pi' of the driving motor after the current adjustment of the magnetorheological damper and is less than a second preset value ε2, if yes, it is determined that the current smoke baffle is in a normal closing state, and the current input current Ib of the magnetorheological damper is stored; if no, proceeding to step 7-a.

[0042] Compared with the prior art, the advantages of the present application are that: by applying a certain current to the magneto-rheological damper, the coil generates a constant magnetic field, under the action of the magnetic field, the flow characteristics of the magneto-rheological body will change, thereby changing the movement resistance of the piston rod in the magneto-rheological body. Therefore, by changing the current of the magneto-rheological damper, the purpose of controlling the damping of the magneto-rheological damper can be achieved to control the operating speed of the smoke baffle, avoid the case that the smoke baffle shakes the shell or even the whole machine after reaching the position due to too fast speed, and also can keep the opening speed of the smoke baffle of the range hood within a fixed speed range under the influence of environmental temperature and other external factors, thereby improving the user experience; in addition, the magneto-rheological damper can also be pre-adjusted to match the use habits of users, so as to meet the needs of different users for the operating speed of the smoke baffle of the range hood. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 It is a structural schematic view of the range hood in the embodiment of the present application (the side of the shell is omitted);

[0044] Figure 2 It is a structural schematic view of the movement mechanism for driving the movement of the smoke baffle in the range hood; Figure 1

[0045] Figure 3 It is a sectional view of the movement mechanism; Figure 2

[0046] Figure 4 It is a sectional view of the magneto-rheological damper in the range hood. Figure 2 DETAILED DESCRIPTION The present application will be further described in detail below with reference to the embodiments of the drawings.

[0047] As shown in the drawings, the range hood in the embodiment includes a shell 1, a smoke baffle 2, a movement mechanism for driving the movement of the smoke baffle 2, and a magneto-rheological damper 4.

[0048] Figures 1 to 4 The shell 1 has an air inlet 11 on the front side; the smoke baffle 2 is constrained in front of the air inlet 11 in a manner capable of rotating relative to the shell 1, so as to open or close the air inlet 11; the movement mechanism includes a driving mechanism 31 and a transmission mechanism 32, both of which are located behind the smoke baffle 2; in the embodiment, the driving mechanism 31 is a driving motor, the power input end of the transmission mechanism 32 is drivingly connected with the driving mechanism 31, and the power output end of the transmission mechanism 32 is drivingly connected with the smoke baffle 2, so as to drive the smoke baffle 2 to rotate through the transmission mechanism 32 under the driving of the driving mechanism 31.

[0049] As shown in the drawings, the range hood in the embodiment includes a shell 1, a smoke baffle 2, a movement mechanism for driving the movement of the smoke baffle 2, and a magneto-rheological damper 4.

[0050] As shown in the drawings, the range hood in the embodiment includes a shell 1, a smoke baffle 2, a movement mechanism for driving the movement of the smoke baffle 2, and a magneto-rheological damper 4. Figure 2 Figure 3 ​​​​As shown, the transmission mechanism 32 in the embodiment includes a transmission frame and a connecting rod 322, the transmission frame includes a first connecting arm 3211 and a second connecting arm 3212 arranged in opposite intervals, the connecting rod 322 is located between the first connecting arm 3211 and the second connecting arm 3212, the first end of the first connecting arm 3211 and the first end of the second connecting arm 3212 are connected and connected with the power output shaft of the driving mechanism 31, the second end of the first connecting arm 3211 and the second end of the second connecting arm 3212 are respectively locked or unlocked with the connecting rod 322 through the adjusting device, and the second end of the first connecting arm 3211 and the second end of the second connecting arm 3212 can move forward and backward relative to the connecting rod 322 when the second end of the first connecting arm 3211 and the second end of the second connecting arm 3212 are unlocked with the connecting rod 322; the front end of the connecting rod 322 is rotatably connected with the back of the smoke baffle 2, and the rear end of the connecting rod 322 is rotatably connected with the free end of the piston rod 42. In addition, the housing 1 is also provided with a mounting frame 6 located behind the smoke baffle 2 and for fixedly mounting the driving mechanism 31, the mounting frame 6 includes two side plates 61 arranged in opposite intervals, and a containing space 60 is formed between the two side plates 61, and the two side plates 61 are respectively provided with through holes for the power output shaft of the driving mechanism 31 to pass through, and the first end of the first connecting arm 3211 and the first end of the second connecting arm 3212 are arranged in the containing space 60 and fixed on the power output shaft of the driving mechanism 31.

[0051] As shown in the drawings, Figure 3 In the embodiment, the adjusting device is an adjusting shaft 5, the connecting rod 322 is provided with a long hole 3221 along the length direction for inserting the adjusting shaft 5, at least one positioning hole 3222 is arranged on the long hole 3221, the adjusting shaft 5 can move along the extension direction of the long hole 3221, and has the following two states: in the first state, the adjusting shaft 5 is inserted into the positioning hole 3222 to relatively lock the transmission frame and the connecting rod 322; in the second state, the adjusting shaft 5 is separated from the positioning hole 3222 to unlock the transmission frame and the connecting rod 322. The specific structure and working process of the adjusting shaft 5 can refer to the disclosure of the patent with the patent number ZL202121149348.9 (the authorized announcement number is CN 215863594U) applied by the applicant in the prior application, which will not be expanded here.

[0052] As shown in the drawings, Figure 4 The magnetorheological damper 4 in the embodiment includes a cylinder 41 containing a magnetorheological body inside, a piston rod 42 reciprocally movable in the cylinder 41, and a coil 43 wound around the piston rod 42, the free end of the piston rod 42 extends from the first end of the cylinder 41 and is rotatably connected with the transmission mechanism 32 (corresponding to the rear end of the connecting rod 322 being connected), and the second end of the cylinder 41 is rotatably connected with the inner wall of the housing 1 (corresponding to being rotatably connected with the back plate of the housing 1). Figure 1 In the cylinder 41, at least one winding cylinder 44 is arranged for the coil 43 to wind around Figure 4The middle winding drum 44 is two and is arranged in the cylinder body 41 at intervals, and the winding drum 44 is sleeved on the piston rod 42.

[0053] The first end of the cylinder body 41 is open, and a first sealing ring 45 capable of being constrained on the inner wall of the cylinder body 41 is arranged at the opening, the first sealing ring 45 is sleeved on the piston rod 42, and the first sealing ring 45 can be in sealing connection with the piston rod 42 during reciprocating movement of the piston rod 42; in addition, a second sealing ring 46 capable of being constrained on the inner wall of the cylinder body 41 is arranged at a position adjacent to the second end of the cylinder body 41, the second sealing ring 46 is sleeved on the piston rod 42, and the second sealing ring 46 can be in sealing connection with the piston rod 42 during reciprocating movement of the piston rod 42.

[0054] The working principle of the magneto-rheological damper 4 in the embodiment is as follows: the cylinder body 41 is filled with a magneto-rheological body, a certain current is applied to the magneto-rheological damper 4, the coil 43 generates a constant magnetic field, under the action of the magnetic field, the flow characteristics of the magneto-rheological body change, so that the movement resistance of the piston rod 42 in the magneto-rheological body changes. Therefore, by changing the current of the magneto-rheological damper 4, the purpose of controlling the damping of the magneto-rheological damper 4 can be achieved, so as to control the running speed of the smoke baffle 2, and avoid the situation that the body or even the whole machine shakes after reaching the position due to the too fast speed of the smoke baffle.

[0055] The control method of the above range hood includes the following steps:

[0056] Step 1, turn on the range hood, collect the output power change curve of the driving motor during the process that the smoke baffle is opened from the beginning to completely open, and mark it as the first output power curve Pa;

[0057] Step 2, turn off the range hood, collect the output power change curve of the driving motor during the process that the smoke baffle is closed from the beginning to completely close, and mark it as the second output power curve Pb;

[0058] Step 3, according to the same method in steps 1 and 2, respectively collect the first output power curve Pa and the second output power curve Pb corresponding to n range hoods, and take the average of the n first output power curves Pa to obtain the first output power average curve Take the average of the n second output power curves Pb to obtain the second output power average curve

[0059] Step 4, collect the output power of the driving motor in real time;

[0060] Step 5, judge whether the current output power Pi of the driving motor is 0, if yes, go to step 4; if no, go to step 6;

[0061] Step 6, compare the current output power Pi of the driving motor with the output power value of the first output power average curve at the same time and the output power value of the second output power average curve at the same time respectively. Pi can be understood as the output power average corresponding to the i th minute from the start of opening of the smoke screen, and Pi is also the output power corresponding to the i th minute from the start of opening or closing of the smoke screen, Pi can be understood as the output power average corresponding to the i th minute from the start of closing of the smoke screen.

[0062] In this embodiment, the comparison process is as follows:

[0063] Step 6-1, determine whether is less than the first preset value ε1, if yes, it is determined that the current smoke screen is in a normal opening state, if no, it is transferred to step 6-2; the first preset value ε1 is obtained according to experiments;

[0064] Step 6-2, determine whether is less than the second preset value ε2, if yes, it is transferred to determine that the current smoke screen is in a normal closing state, if no, it is transferred to step 6-3; the second preset value ε2 is obtained according to experiments;

[0065] Step 6-3, determine whether is less than if yes, it is determined that the current smoke screen is in an abnormal opening state, if no, it is determined that the current smoke screen is in an abnormal closing state;

[0066] Step 7, according to the comparison result, it is determined that the current smoke screen is in an abnormal state or a normal state, and according to different working states, the following operations are performed:

[0067] If the current smoke screen is in a normal state, the input current of the magneto-rheological damper corresponding to the action state of the smoke screen is updated and stored, and the process is ended, wherein the action state of the smoke screen includes the first action state corresponding to the opening of the smoke screen from the start to the completion in step 1 and the second action state corresponding to the closing of the smoke screen from the start to the completion in step 2;

[0068] If the current smoke screen is in an abnormal state, the input current of the magneto-rheological damper is adjusted, and the process is transferred to step 8;

[0069] Step 8, the output power of the driving motor after the adjustment of the input current of the magneto-rheological damper is obtained, and it is compared with the output power average curve corresponding to the action state of the smoke screen, and the process is transferred to step 7.

[0070] The normal state of the smoke baffle includes a normal open state and a normal closed state, and the abnormal state of the smoke baffle includes an abnormal open state and an abnormal closed state.

[0071] If the current smoke baffle is in the abnormal open state, the control logic in steps 7 and 8 is specifically as follows:

[0072] Step 7-1, the input current of the magneto-rheological damper is increased or decreased, the adjusted input current of the magneto-rheological damper is recorded as Ia, and it is determined whether Ia is within a preset range [Ia min , Ia max ], Ia min is a preset minimum value of the input current of the magneto-rheological damper when the smoke baffle is in the first action state, Ia max is a preset maximum value of the input current of the magneto-rheological damper when the smoke baffle is in the first action state, if yes, the process proceeds to step 7-2, and if no, a fault alarm is given and the process ends.

[0073] Step 7-2, it is determined whether the difference between the output power Pi' of the driving motor after the magneto-rheological damper current is adjusted and is less than a first preset value ε1, if yes, it is determined that the current smoke baffle is in the normal open state, and the input current Ia of the magneto-rheological damper is stored, and if no, the process proceeds to step 7-1.

[0074] If the current smoke baffle is in the abnormal closed state, the control logic in steps 7 and 8 is specifically as follows:

[0075] Step 7-a, the input current of the magneto-rheological damper is increased or decreased, the adjusted input current of the magneto-rheological damper is recorded as Ib, and it is determined whether Ib is within a preset range [Ib min , Ib max ], Ib min is a preset minimum value of the input current of the magneto-rheological damper when the smoke baffle is in the second action state, Ib max is a preset maximum value of the input current of the magneto-rheological damper when the smoke baffle is in the second action state, if yes, the process proceeds to step 7-b, and if no, a fault alarm is given and the process ends.

[0076] Step 7-b, it is determined whether the difference between the output power Pi' of the driving motor after the magneto-rheological damper current is adjusted and is less than a second preset value ε2, if yes, it is determined that the current smoke baffle is in the normal closed state, and the input current Ib of the magneto-rheological damper is stored, and if no, the process proceeds to step 7-a.

[0077] In this embodiment, the running speed of the smoke baffle is not easy to collect directly, so the output power of the driving motor is collected to indirectly reflect the opening speed of the smoke baffle, and it is judged that the abnormal motion speed of the smoke baffle occurs in the opening or closing stage, which is closer to the current output power value and the output power value in the opening or closing stage. Therefore, the current of the magnetorheological damper 4 can be changed to control the damping of the magnetorheological damper 4, so as to control the running speed of the smoke baffle 2, and avoid the situation that the body or even the whole machine shakes after the smoke baffle reaches the position due to too fast speed.

Claims

1. A control method of a range hood, the range hood comprising: a housing (1) having an air inlet (11) at a front side thereof; a baffle plate (2) rotatably constrained in front of the air inlet (11) so as to open or close the air inlet (11); a driving mechanism (31) located behind the baffle plate (2); a transmission mechanism (32) located behind the baffle plate (2), a power input end of the transmission mechanism (32) being drivingly connected with the driving mechanism (31), and a power output end of the transmission mechanism (32) being drivingly connected with the baffle plate (2), the baffle plate (2) being driven to rotate by the transmission mechanism (32) under the driving of the driving mechanism (31); characterized in that further comprising: a magneto-rheological damper (4) comprising a cylinder (41) in which a magneto-rheological body is accommodated, a piston rod (42) reciprocally constrained in the cylinder (41), and a coil (43) wound on the piston rod (42), a free end of the piston rod (42) extending from a first end of the cylinder (41) and being rotatably connected with the transmission mechanism (32), and a second end of the cylinder (41) being rotatably connected with an inner wall of the housing (1); the driving mechanism (31) being a driving motor, the control method of the range hood comprising the following steps: Step 1, opening the range hood, collecting a variation curve of the output power of the driving motor in the process that the baffle plate is opened from the beginning to the completion, and recording the variation curve as a first output power curve Pa; Step 2, closing the range hood, collecting a variation curve of the output power of the driving motor in the process that the baffle plate is closed from the beginning to the completion, and recording the variation curve as a second output power curve Pb; Step 3, according to the same method in step 1 and step 2, the first output power curve Pa and the second output power curve Pb corresponding to n range hood are collected respectively, and the first output power curve Pa is averaged to obtain the first output power average curve The second output power curve Pb is averaged to obtain the second output power average curve Step 4, collecting the output power of the driving motor in real time; Step 5, judging whether the current output power Pi of the driving motor is 0, if yes, turning to Step 4, and if no, turning to Step 6; Step 6, compare the current output power Pi of the drive motor with the output power value at the same time in the first output power average curve and the second output power average curve respectively respectively ; Step 7, judging that the current baffle plate is in an abnormal state or a normal state according to the comparison result, and performing the following operations according to different working states: if the current baffle plate is in the normal state, updating and storing the input current of the magneto-rheological damper corresponding to the action state of the baffle plate, and ending, wherein the action state of the baffle plate comprises the first action state corresponding to the process that the baffle plate is opened from the beginning to the completion in Step 1 and the second action state corresponding to the process that the baffle plate is closed from the beginning to the completion in Step 2; if the current baffle plate is in the abnormal state, adjusting the input current of the magneto-rheological damper, and turning to Step 8; Step 8, obtaining the output power of the driving motor after the input current of the magneto-rheological damper is adjusted, comparing the output power with a mean curve of the output power corresponding to the action state of the baffle plate, and turning to Step 7.

2. The control method according to claim 1, characterized by: At least one winding cylinder (44) for winding the coil (43) is further arranged in the cylinder (41), and the winding cylinder (44) is sleeved on the piston rod (42).

3. The control method according to claim 2, characterized in that: The first end of the cylinder (41) has an open end, and a first sealing ring (45) is arranged on the inner wall of the cylinder (41) and is sleeved on the piston rod (42) and can be in sealing connection with the piston rod (42) during reciprocating movement of the piston rod (42).

4. The control method according to claim 3, characterized in that: A second sealing ring (46) is also arranged on the inner wall of the cylinder (41) adjacent to the second end of the cylinder (41), and the second sealing ring (46) is sleeved on the piston rod (42) and can be in sealing connection with the piston rod (42) during reciprocating movement of the piston rod (42).

5. The control method according to any one of claims 1 to 4, characterized in that: The transmission mechanism (32) includes a transmission frame and a connecting rod (322), the transmission frame includes a first connecting arm (3211) and a second connecting arm (3212) arranged in opposite directions, and the connecting rod (322) is located between the first connecting arm (3211) and the second connecting arm (3212), the first end of the first connecting arm (3211) and the first end of the second connecting arm (3212) are connected and connected with the power output shaft of the driving mechanism (31), the second end of the first connecting arm (3211) and the second end of the second connecting arm (3212) are respectively locked or unlocked with the connecting rod (322) through adjusting devices, and the second end of the first connecting arm (3211) and the second end of the second connecting arm (3212) can move forward and backward relative to the connecting rod (322) when the second end of the first connecting arm (3211) and the second end of the second connecting arm (3212) are unlocked with the connecting rod (322); the front end of the connecting rod (322) is rotatably connected with the back of the smoke baffle (2), and the rear end of the connecting rod (322) is rotatably connected with the free end of the piston rod (42).

6. The control method according to claim 5, characterized in that: The adjusting device is an adjusting shaft (5), the connecting rod (322) is provided with a long hole (3221) along the length direction for inserting the adjusting shaft (5), at least one positioning hole (3222) is arranged on the long hole (3221), the adjusting shaft (5) can move along the extension direction of the long hole (3221), and has the following two states: in the first state, the adjusting shaft (5) is inserted into the positioning hole (3222) to relatively lock the transmission frame and the connecting rod (322); in the second state, the adjusting shaft (5) is separated from the positioning hole (3222) to unlock the transmission frame and the connecting rod (322).

7. The control method according to claim 6, characterized in that: The housing (1) is also provided with a mounting frame (6) behind the smoke baffle (2) and for fixedly mounting the driving mechanism (31), the mounting frame (6) includes two side plates (61) arranged in opposite directions, and a containing space (60) is formed between the two side plates (61), the two side plates (61) are respectively provided with through holes for the power output shaft of the driving mechanism (31) to pass through, and the first end of the first connecting arm (3211) and the first end of the second connecting arm (3212) are arranged in the containing space (60) and fixed on the power output shaft of the driving mechanism (31).

8. The control method according to claim 1, characterized by: The abnormal state of the smoke baffle in step 7 includes an abnormal open state and an abnormal close state, and the normal state of the smoke baffle includes a normal open state and a normal close state.

9. The control method according to claim 8, characterized in that: The comparison specific process in step 6 is: Step 6-1, judging whether it is less than a first preset value ε1, if yes, it is determined that the current smoke screen is in a normal open state; if no, it goes to step 6-2. Step 6-2, judging whether it is less than a second preset value ε2, if yes, it is determined that the current smoke baffle is in a normal closing state, if no, it is transferred to step 6-3. Step 6-3, judging whether less than If yes, it is determined that the current smoke screen is in an abnormal open state; if no, it is determined that the current smoke screen is in an abnormal closed state.

10. The control method according to claim 9, characterized in that: If the current smoke baffle is in the abnormal open state, the control logic in steps 7 and 8 is specifically: Step 7-1, increase or decrease the input current of the magneto-rheological damper, record the adjusted input current of the magneto-rheological damper as Ia, and determine whether Ia is within a preset range [Ia min , Ia max ], Ia min is the preset minimum value of the input current of the magneto-rheological damper when the smoke screen is in the first action state, and Ia max is the preset maximum value of the input current of the magneto-rheological damper when the smoke screen is in the first action state. If yes, go to step 7-2; if no, issue a fault alarm and end. Step 7-2, calculate the difference between the output power Pi' of the driving motor after the current adjustment of the magnetorheological damper and a first preset value ε1. If yes, it is determined that the current smoke screen is in a normal opening state, and the input current Ia of the magnetorheological damper is stored. If no, it is continued to step 7-1.

11. The control method according to claim 9 or 10, characterized by: If the current smoke baffle is in the abnormal close state, the control logic in steps 7 and 8 is specifically: If the current smoke baffle is in the abnormal close state, the control logic in steps 7 and 8 is specifically: Step 7-a, increase or decrease the input current of the magneto-rheological damper, the input current of the adjusted magneto-rheological damper is recorded as Ib, and it is judged whether Ib is within a preset range [Ib min , Ib max ], Ib min is the preset minimum value of the input current of the magneto-rheological damper when the smoke screen is in the second action state, and Ib max is the preset maximum value of the input current of the magneto-rheological damper when the smoke screen is in the second action state, if yes, go to step 7-b, if no, alarm, end; Step 7-b, whether the difference between the output power Pi' of the driving motor after the current adjustment of the magnetorheological damper and is less than the second preset value ε2, if yes, it is determined that the current smoke screen is in the normal closing state, and the input current Ib of the magnetorheological damper is stored; if no, it is continued to step 7-a.

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