CN113834103B

CN113834103B - Range hood and control method thereof

Info

Publication number: CN113834103B
Application number: CN202111050815.7A
Authority: CN
Inventors: 何立博
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-09-08
Filing date: 2021-09-08
Publication date: 2023-08-18
Anticipated expiration: 2041-09-08
Also published as: CN113834103A

Abstract

The invention discloses a range hood and a control method thereof, wherein the range hood comprises a fume collecting hood, a fan frame arranged above the fume collecting hood and a fan system arranged in the fan frame, an air inlet is formed in the fume collecting hood, a fixed filter screen is arranged at the air inlet, a smoke guide plate assembly is arranged below the fixed filter screen, and the smoke guide plate assembly comprises a main smoke guide plate positioned in the middle; the method is characterized in that: a movable filter screen is arranged below the fan system in the fan frame and transversely extends, and the movable filter screen can move up and down and left and right, so that the air inlet states of a left side channel and a right side channel below the fan system in the fan frame and the gap between the movable filter screen and a fixed filter screen are changed; the smoke guide plate assembly further comprises a first auxiliary smoke guide plate positioned on the left side of the main smoke guide plate and a second auxiliary smoke guide plate positioned on the right side of the main smoke guide plate, and the first auxiliary smoke guide plate and the second auxiliary smoke guide plate can rotate around the axis extending from front to back.

Description

Range hood and control method thereof

Technical Field

The invention relates to a lampblack purifying device, in particular to a range hood and a control method of the range hood.

Background

The range hood has become one of the indispensable kitchen appliances in modern families. The range hood works by utilizing the fluid dynamics principle, and the range hood sucks and discharges oil smoke through a centrifugal fan arranged in the range hood and filters part of grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor for driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, and oil smoke below the range hood is sucked into the fan and is collected by the volute after being accelerated by the fan to be guided to be discharged out of the room.

The common range hood comprises a top suction type and a side suction type, the top suction type range hood adopts a lampblack rising principle, a negative pressure area is generated right above a cooking bench, and lampblack which naturally rises is generated during cooking is sucked and discharged.

Therefore, a smoke guide plate is arranged below an air inlet of the top-suction type range hood to form a ring-suction type structure, and the wall-attached effect is utilized to improve the smoke suction effect. The top-draft type range hood with the smoke guide plate disclosed in the Chinese patent with the application number of 201410419676.4 comprises a machine body, a smoke collecting hood and the smoke guide plate, wherein the smoke collecting hood is connected with the machine body, a fan is arranged in the machine body, an air inlet is formed in the smoke collecting hood, the smoke guide plate is arranged opposite to the air inlet of the smoke collecting hood and is fixed on the smoke collecting hood through a bracket or a buckle, and a distance exists between the smoke guide plate and the smoke collecting hood to form a smoke channel.

The range hood adopting the smoke guide plate does not drip oil, has better oil smoke suction effect and has wider and wider application in recent years. The existing range hood adopting the smoke guide plate has the following defects:

1. when the traditional range hood is used on a common double-range, the air quantity or the area of an air inlet cannot be adjusted to adapt to the cooking condition because the cooking smoke quantity difference between the quick-frying side and the soup cooking side is large;

2. although the air inlet of some range hoods is regulated along with the size of the oil smoke, two sets of driving motors are generally needed to be respectively realized, so that the cost is high, the stability is poor and the popularization difficulty is high.

Disclosure of Invention

The first technical problem to be solved by the invention is to provide the range hood aiming at the defects in the prior art, so that the distribution of the air inlet area and the resistance can be realized to adapt to the cooking condition, and the oil fume suction effect is improved.

The second technical problem to be solved by the invention is to provide a control method of the range hood.

The technical scheme adopted by the invention for solving the first technical problem is as follows: the smoke exhaust ventilator comprises a smoke collecting hood, a fan frame arranged above the smoke collecting hood and a fan system arranged in the fan frame, wherein an air inlet is formed in the smoke collecting hood, a fixed filter screen is arranged at the air inlet, a smoke guide plate assembly is arranged below the fixed filter screen, and the smoke guide plate assembly comprises a main smoke guide plate positioned in the middle; the method is characterized in that:

A movable filter screen is arranged below the fan system in the fan frame and transversely extends, and the movable filter screen can move up and down and left and right, so that the air inlet states of a left side channel and a right side channel below the fan system in the fan frame and the gap between the movable filter screen and a fixed filter screen are changed;

the smoke guide plate assembly further comprises a first auxiliary smoke guide plate positioned on the left side of the main smoke guide plate and a second auxiliary smoke guide plate positioned on the right side of the main smoke guide plate, and the first auxiliary smoke guide plate and the second auxiliary smoke guide plate can rotate around the axis extending from front to back.

For the motion of the automatic drive movable filter screen of being convenient for, the inside motion that can drive movable filter screen that still is provided with of fan frame, motion includes output gear, slider fixed block, fixed bolster and first slider, the fixed bolster sets up the inboard at the fan frame fixedly, first slider and fixed bolster sliding fit can reciprocate along the fixed bolster, first slider is connected with output gear rotation, output gear's axis of rotation extends along the fore-and-aft direction, slider fixed block rotates with output gear's eccentric position and is connected to can drive by output gear and reciprocate and control the ground, the slider fixed block still is used for being connected fixedly with movable filter screen.

The motion mechanism further comprises a driving wheel, a gear limiting frame and a driving mechanism for driving the driving wheel to rotate along an axis extending forwards and backwards, the driving wheel is meshed with the output gear, the driving wheel is connected with the output gear through the gear limiting frame, and the gear limiting frame is fixedly connected with the driving wheel and is rotationally connected with the center of the output gear.

In order to facilitate the rotation of the driving output gear, the motion mechanism further comprises a second sliding block, the sliding block fixing block is in sliding fit with the second sliding block and can move up and down along the second sliding block, and the second sliding block can be driven by the sliding block fixing block to move left and right.

Preferably, the movable filter screen and the auxiliary smoke guide plates share the same driving mechanism, stability of the moving mechanism is improved, the moving mechanism further comprises a first sliding rod, a second sliding rod and pushing blocks, the first sliding rod is provided with two sliding rods and is respectively and fixedly arranged on the left side and the right side of the second sliding rod, the second sliding rod is provided with two sliding rods and is respectively arranged on the left side and the right side in the fan frame, the second sliding rods longitudinally extend and downwardly extend to the lower portion of the air inlet, each second sliding rod corresponds to one pushing block, the pushing blocks are arranged on the main smoke guide plates, when the first sliding rod moves in the direction away from the other first sliding rod, the second sliding rod can be pushed to move in the direction away from the other pushing blocks, and accordingly, the corresponding auxiliary smoke guide plates are driven to rotate, and each auxiliary smoke guide plate keeps open to be in a flattening trend.

For the left and right movement of the first slide bar of being convenient for drives the downward movement of second slide bar, first slide bar is the shape of buckling, a part of first slide bar extends along left and right direction and another part then extends along fore-and-aft direction after buckling, the bottom surface of the part of extending around the first slide bar is slope form and by the side that is close to each other upwards slope gradually to the side that keeps away from each other, the upper end of second slide bar can cooperate with the part of extending around the first slide bar of relevant position for first slide bar can promote the second slide bar and move downwards.

In order to facilitate the downward movement of the second slide bar to drive the pushing block to move left and right, the lower end face of the second slide bar is gradually inclined upwards from one end close to each other to the other end far away from the other end, and the upper end face of the pushing block is gradually inclined upwards from one end close to each other to the other end far away from the other end, so that the second slide bar can push the pushing block to move.

In order to convert the linear motion of the pushing block into the rotation of the auxiliary smoke guide plate, the motion mechanism further comprises a rack arranged on the upper surface of the main smoke guide plate, a transmission gear meshed with the rack and a transmission shaft rotationally connected with the main smoke guide plate, wherein the transmission shaft can rotate around an axis extending forwards and backwards, the rack extends in the left-right direction, each auxiliary smoke guide plate corresponds to one rack and the transmission shaft, the pushing block is arranged at the end part of each rack, which is close to each other, and the pushing block and the rack synchronously move, and the transmission gear is arranged on the transmission shaft in a winding manner and can synchronously rotate; each auxiliary smoke guide plate is fixedly connected with the transmission shaft on the corresponding side so as to synchronously rotate.

In order to facilitate automatic resetting of the auxiliary smoke guide plate, the motion mechanism further comprises two supports and elastic pieces, wherein the supports are arranged between the two pushing blocks, each support corresponds to one pushing block, the elastic pieces are connected between each support and the corresponding pushing block, and the elastic pieces apply force to the pushing blocks to enable the pushing blocks to keep moving towards the supports, so that the corresponding auxiliary smoke guide plate keeps flattening.

The first technical scheme adopted by the invention for solving the second technical problem is as follows: the control method of the range hood is characterized by comprising the following steps: the method comprises the following steps:

1) Starting the range hood, and operating in a default gear;

2) Acquiring the current left-side oil smoke concentration ya and right-side oil smoke concentration yb;

3) Comparing ya with yb, setting comparison reference values m1 and m2, wherein m1 represents a preset difference lower limit value, m2 represents a preset difference upper limit value, and controlling accordingly according to the comparison result:

3.1 If the difference between ya and yb exceeds m2, comparing ya and yb, and controlling accordingly according to the result of the comparison, in this step, the gap between the movable screen and the fixed screen in the large oil smoke scene is also controlled to be larger than the gap between the movable screen and the fixed screen in the small oil smoke scene:

3.1 If the difference between ya and yb is larger than m2, indicating that the oil concentration at two sides has obvious large difference, marking the larger value in ya and yb as yd, comparing the larger value with a preset oil smoke concentration threshold y1, and performing corresponding control according to the comparison result:

3.1.1 If yd > y1, representing a large oil smoke scene with larger difference on the left side and the right side, comparing ya with yb, and controlling correspondingly according to the comparison result:

3.1.1.1 If ya is greater than yb, controlling the first auxiliary smoke guide plate on the left side to be opened and flattened, enabling the movable filter screen to be positioned in the right side channel, closing the movable filter screen by folding the second auxiliary smoke guide plate on the right side, and then entering the step 4);

3.1.1.2 If ya is less than yb, controlling the second auxiliary smoke guide plate on the right side to be opened and flattened, enabling the movable filter screen to be positioned in the left side channel, closing the first auxiliary smoke guide plate on the left side by folding, and then entering the step 4);

3.1.2 If yd is less than or equal to y1, representing a small oil smoke scene with larger difference on the left side and the right side, comparing ya with yb, and correspondingly controlling according to the comparison result:

3.1.2.1 If ya is greater than yb, controlling the first auxiliary smoke guide plate on the left side to be opened and flattened, enabling the movable filter screen to be positioned in the right side channel, closing the movable filter screen by folding the second auxiliary smoke guide plate on the right side, and then entering the step 4);

3.1.2.2 If ya is less than yb, controlling the first auxiliary smoke guide plate on the left side to be opened and flattened, enabling the movable filter screen to be positioned in the right side channel, closing the movable filter screen by folding the second auxiliary smoke guide plate on the right side, and then entering the step 4);

3.2 If the difference between ya and yb is between m1 and m2, the lampblack concentration at both sides is considered to have smaller difference, and the rotation angles of the two auxiliary smoke guide plates are determined according to ya and yb;

3.3 If the difference between ya and yb is smaller than m1, the lampblack concentration at two sides is considered to be no difference, the larger value in ya and yb is marked as yd, yd is compared with a preset lampblack concentration threshold y1, corresponding control is carried out according to the comparison result, in the step, the gap between a movable filter screen and a fixed filter screen in a large lampblack scene is also controlled to be larger than the gap between the movable filter screen and the fixed filter screen in a small lampblack scene, and the two auxiliary smoke guide plates are opened to be flattened:

3.3.1 If yd > y1, representing a scene of about big oil smoke, controlling the dynamic filter screen to be positioned at the middle position in the left-right direction, and then entering the step 4);

3.3.2 If yd is less than or equal to y1, representing a scene of about little oil smoke, controlling the movable filter screen to be positioned at the middle position in the left-right direction, and then entering the step 4);

4) Acquiring current position information of the movable filter screen and each auxiliary smoke guide plate;

5) Judging whether the current positions of the movable filter screen and each auxiliary smoke guide plate are matched with the current cooking scene, if yes, returning to the step 2), if not, driving the movable filter screen and each auxiliary smoke guide plate to the corresponding state, and returning to the step 4 after waiting for a time interval delta ta.

Preferably, in step 3), ifJudging that the difference between ya and yb exceeds m2; if-> Judging that the difference between ya and yb is between m1 and m2; if->The difference between ya and yb is considered to be less than m1.

The second technical scheme adopted by the invention for solving the second technical problem is as follows: the control method of the range hood is characterized by comprising the following steps: the method comprises the following steps:

1) Starting the range hood, and operating in a default gear;

3.1 If (1)Indicating that the oil concentration at two sides has obvious large difference, marking the larger value of ya and yb as yd, and comparing the larger value with the preset oil smoke concentrationThreshold y1 is compared, and corresponding control is carried out according to the comparison result:

5) Judging whether the current positions of the movable filter screen and each auxiliary smoke guide plate are matched with the current cooking scene, if yes, entering the step 6), if not, driving the movable filter screen and each auxiliary smoke guide plate to a corresponding state, and returning to the step 4 after waiting for a time interval delta ta;

6) Acquiring the current flow Qm flowing through the fan system (3);

7) Judging whether Qm is in [ Qx, qd ] of the corresponding cooking scene, wherein Qx and Qd are respectively the upper limit value and the lower limit value of the corresponding cooking scene, if yes, entering step 8), and if no, entering step 9);

8) Continuing monitoring, judging whether the monitoring times s=s+1 are met or not, judging whether the monitoring times s is equal to or greater than s1, if yes, writing, storing, updating and updating preset values of the gear and the position of the current scene, resetting the s=0, and returning to the step 2); if not, continuing to monitor, and returning to the step 2);

9) If Qm > Qd, go to step 10), if Qm < Qx, go to step 12);

10 Judging whether the gear or the rotating speed of the fan system of the current range hood is the lowest, if so, entering the step 11); if not, the 1 st gear is turned down, and the step 6) is returned;

11 Judging whether the gap between the movable filter screen and the fixed filter screen is minimum, and if so, prompting maintenance; if not, driving the movable filter screen to move downwards, reducing the gap, and returning to the step 6);

12 Judging whether the gear or the rotating speed of the fan system of the current range hood is highest, if so, entering a step 13); if not, the 1 st gear is turned up, and the step 6) is returned;

13 Judging whether the gap between the movable filter screen and the fixed filter screen is maximum, if so, prompting cleaning, if not, driving the movable filter screen to move upwards, enlarging the gap, and returning to the step 6).

The third technical scheme adopted by the invention for solving the second technical problem is as follows: the control method of the range hood is characterized by comprising the following steps: the method comprises the following steps:

1) The range hood stands by;

2) Recording a group of left and right temperature information, and obtaining a left temperature value and a right temperature value;

3) Judging whether 2 groups of temperature values at different times exist or not, if so, entering a step 4); if not, returning to the step 2) after waiting for the time interval delta t;

4) Calculating a left temperature change slope kL= (TL 2-TL 1)/deltat, and calculating a right temperature change slope kR= (TR 2-TR 1)/deltat; TL2 and TL1 are two sets of left temperature values, with TL2 time after, TR2 and TR1 are two sets of right temperature values, with TR2 time after;

5) Reading a stored left side temperature change slope reference value kLa and a right side temperature change slope reference value kRa;

6) Comparing kL with kLa, kR and kRa respectively, if |kL| > kLa and kL is positive, starting the range hood to absorb the smoke, and entering the step 8); if |kL| > kLa and kL is negative, or |kL|+.ltoreq kLa, then go to step 7); if the I kR I is more than kRa and the kR is positive, starting the range hood to absorb the fume, and entering the step 8); if |kR| > kRa and kR is negative, or |kR|+. kRa, then go to step 7);

7) Judging whether TR2 is smaller than a preset right-side temperature reference value Tra and TL2 is smaller than a preset left-side temperature reference value TLa, if so, not starting the range hood, and if not, starting the range hood to absorb the range hood, and entering step 8);

8) Comparing kL with kR, if kL-kR > kθ, indicating a cooking scene mainly comprising left side fume, and entering step 9); if the I kL-kR I is less than kθ, the same cooking scene on the left side and the right side is indicated, and the step 9 is entered; if kR-kL > kθ, the cooking scene mainly comprising right-side oil smoke is shown, and step 9 is entered; kθ is a threshold value of a preset temperature change slope difference value;

9) Judging whether the temperature value is suddenly changed, if so, adjusting to the position of the large oil smoke in the corresponding cooking scene to operate, defaulting a fan system to a large gear, and entering the step 10); if not, adjusting to the small oil smoke position in the corresponding cooking scene to run, defaulting a fan system to a small gear, and entering a step 10);

10 Acquiring current position information of the movable filter screen and each auxiliary smoke guide plate;

11 Judging whether the position matches the current cooking scene, if so, entering the step 12), if not, driving the movable filter screen (4) and each auxiliary smoke guide plate to the corresponding position, and returning to the step 10 after waiting for a time interval delta ta;

12 Obtaining the flow Qm of the current fan system;

13 Judging whether Qm is within [ Qx, qd ] of the corresponding cooking scene, wherein Qx and Qd are respectively the upper limit value and the lower limit value of the corresponding cooking scene, if yes, entering step 14), and if no, entering step 15);

14 If yes, writing and updating preset values in the gear and the position of the current cooking scene and resetting s=0; if not, continuing to monitor, and returning to the step 2);

15 If Qm > Qd, enter step 16), if Qm < Qx, enter step 18);

16 Judging whether the gear or the rotating speed of the fan system of the current range hood is the lowest, if so, entering the step 17); if not, the 1 st gear is turned down, and the step is returned to the step 12);

17 Judging whether the gap between the movable filter screen and the fixed filter screen is minimum, and if so, prompting maintenance; if not, driving the movable filter screen to move downwards, reducing the gap, and returning to the step 12);

18 Judging whether the gear or the rotating speed of the fan system of the current range hood is highest, if so, entering a step 19); if not, the 1 st gear is turned up, and the step is returned to the step 12);

19 Judging whether the gap between the movable filter screen and the fixed filter screen is maximum, if so, prompting cleaning, if not, driving the movable filter screen to move upwards, enlarging the gap, and returning to the step 12).

Preferably, in step 9), if the scene is a large oil smoke scene, when the left side or the right side is mainly used for exhausting oil smoke, the channel of the movable filter screen on the side opposite to the large oil smoke is controlled, the auxiliary smoke guide plate on the same side with the movable filter screen is folded and closed, and the auxiliary smoke guide plate on the other side is kept open to be in a flattened state; when the left side and the right side are the same, the movable filter screen is controlled to be positioned at the middle position in the left-right direction, and the two auxiliary smoke guide plates are opened; if the small oil smoke scene is the small oil smoke scene, when the left side or the right side is mainly used for exhausting oil smoke, controlling a channel of the movable filter screen on the opposite side of the small oil smoke, and closing an auxiliary smoke guide plate on the same side of the movable filter screen; when the left side and the right side are the same, the movable filter screen is controlled to be positioned at the middle position in the left-right direction, and the two auxiliary smoke guide plates are opened to be flattened; in the step, the gap between the movable filter screen and the fixed filter screen in the large oil smoke scene is larger than the gap between the movable filter screen and the fixed filter screen in the small oil smoke scene.

The fourth technical scheme adopted by the invention for solving the second technical problem is as follows: the control method of the range hood is characterized by comprising the following steps: the method comprises the following steps:

1) Starting the range hood, defaulting to gear or balancing operation on the left side and the right side;

2) Acquiring current oil smoke amounts at the left side and the right side;

3) Judging whether the difference of the oil smoke amounts at the left side and the right side is larger than a preset threshold value, if so, entering the step 4), and if not, entering the step 6);

4) The control filter screen is positioned at one side of the large oil smoke, the auxiliary smoke guide plate at the side is unfolded to be flattened, and the auxiliary smoke guide plate at the other side is folded and closed;

5) Waiting for a time interval delta t, reading the positions of the movable filter screen and each auxiliary smoke guide plate, judging whether the positions of the movable filter screen (4) and each auxiliary smoke guide plate are in accordance with a cooking state, if so, returning to the step 2), and if not, repeating the step;

6) Reading the positions of the current movable filter screen and each auxiliary smoke guide plate;

7) Judging whether the positions of the current movable filter screen and each auxiliary smoke guide plate accord with the cooking state, if so, returning to the step 2), and if not, driving the movable filter screen and each auxiliary smoke guide plate to run to the corresponding position;

8) And (3) waiting for a time interval delta t, reading the positions of the movable filter screen and each auxiliary smoke guide plate again, judging whether the positions of the movable filter screen and each auxiliary smoke guide plate meet the cooking state or not, if so, returning to the step (2), and if not, repeating the step.

Compared with the prior art, the invention has the advantages that: the double-layer filter screen gap can be adjusted, the movable filter screens in the air inlet state at the left side and the right side can be adjusted, the secondary smoke guide plate can be turned over, flow distribution can be realized through turning over the secondary smoke guide plate, the oil filtering capacity can be further adjusted by matching with the change of the double-layer filter screen gap, and the multiple scene use is met; the moving of the movable filter screen and the overturning of the secondary smoke guide plate are realized through a set of moving mechanism, so that the stability is high and the cost is low.

Drawings

Fig. 1 is a schematic view of a range hood according to an embodiment of the present invention in a first state;

fig. 2 is a cross-sectional view of a range hood according to an embodiment of the present invention in a first state;

fig. 3 is a schematic view of a moving filter screen and a smoke guide plate of the range hood of fig. 2;

FIG. 4 is a schematic exploded view of the dynamic screen of FIG. 3 and a portion of the movement mechanism of the smoke guide assembly;

FIG. 5 is a schematic view of a portion of the components of FIG. 4;

FIG. 6 is an exploded view of the smoke guide plate assembly and a portion of the movement mechanism of FIG. 3;

fig. 7 is a sectional view of a range hood according to an embodiment of the present invention in a second state;

FIG. 8 is a schematic view of the moving filter and smoke guide of the range hood of FIG. 7;

Fig. 9 is a schematic view of a range hood according to an embodiment of the present invention in a third state;

fig. 10 is a sectional view of a range hood according to an embodiment of the present invention in a third state;

FIG. 11 is a schematic view of the moving filter and smoke guide of the range hood of FIG. 10;

fig. 12 is a schematic view of a range hood according to an embodiment of the present invention in a fourth state;

fig. 13 is a cross-sectional view of a range hood according to an embodiment of the present invention in a fourth state;

fig. 14 is a schematic view of a moving filter screen and a smoke guide plate of the range hood of fig. 13;

fig. 15 is a schematic view of a range hood in a fifth state according to an embodiment of the present invention;

fig. 16 is a sectional view of a range hood according to an embodiment of the present invention in a fifth state;

fig. 17 is a schematic view of a moving filter screen and a smoke guide plate of the range hood of fig. 16;

fig. 18 is a sectional view of a range hood according to an embodiment of the present invention in a sixth state;

fig. 19 is a schematic view of a range hood according to an embodiment of the present invention in a seventh state;

fig. 20 is a sectional view of a range hood according to an embodiment of the present invention in a seventh state;

fig. 21 is a sectional view of a range hood according to an embodiment of the present invention in an eighth state;

fig. 22 is a flowchart of a first control method of the range hood according to the embodiment of the present invention;

Fig. 23 is a flowchart of a second control method of the range hood according to the embodiment of the present invention;

fig. 24 is a flowchart of a third control method of the range hood according to the embodiment of the present invention;

fig. 25 is a flowchart of a fourth control method of the range hood according to the embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present 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", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present invention may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.

Referring to fig. 1 to 6, the range hood is a top-draft range hood and comprises a fume collecting hood 1 and a fan frame 2 arranged above the fume collecting hood 1, wherein a fan system 3 is arranged in the fan frame 2. The fume collecting hood 1 is provided with an air inlet 11, so that fume can enter the fan frame 2 from the air inlet 11 in the rising process and is discharged by the fan system 3. The bottom of the fume collecting hood 1 is upwards sunken to form a fume collecting cavity 12, and an air inlet 11 is positioned at the top of the fume collecting cavity 12.

The space in the fan frame 2 below the fan system 3 is divided into a left side channel and a right side channel. The fan frame 2 is located below the fan system 3, that is, on the oil smoke flow path, a movable filter screen 4 is arranged at the upstream of the fan system 3, and the movable filter screen 4 is preferably in a flat plate shape and can move inside the fan frame 2. The air inlet 11 is provided with a fixed filter screen 5, and the fixed filter screen 5 can be tapered from top to bottom, and is fixed at the air inlet 11. The lower part of the fixed filter screen 5 is provided with a smoke guide plate assembly, and the smoke guide plate assembly can be the same as the smoke guide plate assembly in the prior art, and the oil smoke enters the inside of the fan frame 2 through the air inlet 11 from the periphery of the smoke guide plate assembly and the passage between the smoke collecting covers 1.

The movable filter screen 4 is a plate member having mesh holes, and can change resistance, and can move inside the fan frame 2. The movable filter screen 4 is provided with meshes 41, so that the movable filter screen 4 forms a grid mesh. The width of the movable filter screen 4 in the left-right direction is smaller than the width of the fan frame 2 in the left-right direction.

The smoke-guiding plate assembly comprises a main smoke-guiding plate 61 located in the middle, a first auxiliary smoke-guiding plate 62 located on the left side of the main smoke-guiding plate 61 and a second auxiliary smoke-guiding plate 63 located on the right side of the main smoke-guiding plate 61.

The inside of the fan frame 2 is also provided with a movement mechanism for driving the movable filter screen 4 and the two auxiliary smoke guide plates to move, wherein the part of the movement mechanism for driving the movable filter screen 4 comprises a driving wheel 71, an output gear 72, a gear limiting frame 73, a slide block fixing block 74, a fixing bracket 75, a transmission rod 76, a first slide block 77, a second slide block 78 and a driving mechanism 88. The fixing bracket 75 is provided inside the fan frame 2, and may be directly connected to the fan frame 2 or indirectly connected to the fan frame 2 through a mounting plate or the like. In the present embodiment, the fixing bracket 75 is provided at the rear side in the fan frame 2. The drive mechanism 88 is a rotary drive mechanism, preferably a motor, the output of which may be directly or indirectly coupled to the eccentric position of the drive wheel 71 to drive the drive wheel 71 in rotation. The driving mechanism 88 can pass through the fixed bracket 75 to be connected with the driving wheel 71, and the driving mechanism 88 can be connected and fixed with the fixed bracket 75 or the fan frame 2.

The driving wheel 71 and the output gear 72 are provided on the front side of the fixed bracket 75, the output gear 72 is meshed with the driving wheel 71, the output gear 72 is a driven wheel, and the rotation shafts of both gears extend in the front-rear direction. The driving wheel 71 and the output gear 72 are further connected through a gear limiting frame 73, the gear limiting frame 73 is arranged at the rear side of the driving wheel 71 and the output gear 72, the gear limiting frame 73 is fixedly connected with the driving wheel 71 and is rotationally connected with the center of the output gear 72, the relative positions of the driving wheel 71 and the output gear 72 are limited through the gear limiting frame 73, and separation of the two gears is avoided. The fixing bracket 75 is provided with a first guide groove 751 extending up and down, and the first slider 77 is slidably engaged with the first guide groove 751 and is slidable up and down along the first guide groove 751. The first slider 77 is rotatably connected to the output gear 72, preferably to the center of the output gear 72.

The second slider 78 is disposed at the front side of the output gear 72, and has a T-shape, and a second guide groove 781 extending up and down is provided on a longitudinally extending portion of the second slider 78, and the slider fixing block 74 is slidably engaged with the second guide groove 781 and is slidable up and down along the second guide groove 781. The slider fixing block 74 passes through the second guide groove 781 to be rotatably coupled to the eccentric position of the output gear 72. The transmission rod 76 is arranged at the front side of the second sliding block 78, the upper end of the transmission rod 76 is fixedly connected with the sliding block fixing block 74, and the lower end of the transmission rod 76 is fixedly connected with the movable filter screen 4. In the present embodiment, the movable screen 4 has a rectangular shape, and the transmission rod 76 is connected to the middle position in the left-right direction of the movable screen 4. The dynamic screen 4 remains transversely extended throughout the course of the movement.

When the driving mechanism 88 drives the driving wheel 71 to rotate, the output gear 72 is driven to rotate, and the output gear 72 is slidably connected with the fixed bracket 75 through the first sliding block 77 due to the eccentric connection between the driving wheel 71 and the driving mechanism 88, so that the output gear 72 can also move up and down along the fixed bracket 75; since the slider fixed block 74 is eccentrically coupled to the output gear 72, the slider fixed block 74 rotates with the output gear 72 and rotates, driving the transmission rod 76 and the second slider 78 to move up and down and left and right, and the second slider 78 moves in the left and right and up and down directions and is separated in time.

The above-mentioned components of the movement mechanism are used for driving the movable filter screen 4 to move, and the movement mechanism also comprises components for driving the two auxiliary smoke guide plates to move, and the components comprise a first sliding rod 79, a second sliding rod 80, a rack 81, a transmission gear 82, an elastic piece 83 and a pushing block 84. The two first sliding bars 79 are respectively and fixedly arranged at the left and right sides of the transverse part of the second sliding block 78, the first sliding bars 79 are in a bent shape, one part of the first sliding bars 79 extends along the left and right direction, the other part of the first sliding bars extends along the front and rear direction after bending, and preferably, the first sliding bars 79 are in an L shape and the two first sliding bars 79 are symmetrically arranged. The bottom surface of the portion of the first slide bar 79 extending forward and backward is inclined, and gradually inclined upward from the side closer to each other to the side farther from each other. The second slide bar 80 likewise has two, which are arranged on the left and right sides in the fan frame 2, respectively, and the second slide bar 80 can have a bar shape, particularly preferably extends in the vertical direction in the longitudinal direction and extends downward below the air intake 11. The upper end of the second slide bar 80 can be engaged with the front-rear extending portion of the first slide bar 79 at the corresponding position, and the upper end of the second slide bar 80 is inclined to be engaged with the first slide bar 79. Thus, when the first slide bar 79 moves, the second slide bar 80 can be pushed to move downward.

The above-described racks 81 are provided on the upper surface of the main smoke guide 61, and the first auxiliary smoke guide 62 and the second auxiliary smoke guide 63 correspond to one rack 81, respectively, and the racks 81 extend in the left-right direction. The end portions of the racks 81 close to each other are provided with the above-described push blocks 84, and the upper end surfaces of the push blocks 84 are fitted to the lower end surfaces of the second slide bars 80. The lower end surface of the second slide bar 80 is gradually inclined upward from the end close to each other to the end far away, and the upper end surface of the push block 84 is also gradually inclined upward from the end close to each other to the end far away. Thus, when the second slide bar 80 is pushed downward, the pushing block 84 can be pushed to move away from the other pushing block 84, thereby driving the rack 81 to move away from the other rack 81. The driving gears 82 are engaged with the racks 81, which may be disposed on the upper surface of the main smoke guide 81 at positions near the left and right sides, and each driving gear 82 corresponds to one rack 81, whereby when the rack 81 moves leftwards or rightwards, the driving gears 82 may be driven to rotate, so that the corresponding auxiliary smoke guide is folded and closed.

The upper surface of the main smoke guide 61 is also provided with brackets 85 at positions near the left and right, respectively, and the brackets 85 are provided with transmission shafts 86, the transmission shafts 86 extending in the front-rear direction and being rotatable about their own axes with respect to the brackets 85. The transmission gear 82 is sleeved on the periphery of the transmission shaft 86 and is fixedly connected, so that the transmission gear 82 can drive the transmission shaft 86 to rotate. The first auxiliary smoke-guiding plate 62 and the second auxiliary smoke-guiding plate 63 are respectively connected with the transmission shaft 86 at corresponding positions, thereby being capable of rotating along with the transmission shaft 86. In the present embodiment, the first auxiliary smoke guide plate 62 and the second auxiliary smoke guide plate 63 are connected to the transmission shaft 86 through the boss 64, respectively.

The elastic member 83 is preferably a spring in the present embodiment, and the movement mechanism further includes two holders 87, which are provided between the two push blocks 84, one push block 84 for each holder 87. The elastic member 83 described above is connected between each of the holders 87 and the corresponding push block 84. The force exerted by the elastic member 83 on the push block 84 keeps it in a tendency to move towards the seat 87, thereby keeping the corresponding auxiliary smoke-guiding plate in a tendency to open (flattened, horizontal or near horizontal condition). When the external force is removed (in this embodiment, the force applied to the pushing block 84 by the second sliding block 78 through the first sliding rod 79 and the second sliding rod 80) after the auxiliary smoke guide plate is forced to be folded and closed, the pushing block 84 is reset under the action of the second elastic member 83, so that the auxiliary smoke guide plate, the second sliding rod 80 and the first sliding rod 79 are reset.

The first slide bar 79 on the second slide block 78 presses the second slide bar 80 to overcome the spring force and drive the left and right auxiliary smoke guide plates to turn over through the gear-rack transmission, and the angle can be accurately controlled, and the second slide bar 79 can independently move up and down when not pressed, so that the gap between the brake filter screen 4 and the fixed filter screen 5 can be controlled to be adjusted.

In this embodiment, the linkage between the movable filter screen 4 and the auxiliary smoke guide plate is realized by combining a driving mechanism 88 with a gear, a sliding block, etc., and the movable filter screen 4 and the auxiliary smoke guide plate which can be replaced can also be independently driven to move up and down, move left and right and rotate by two or three sets of driving mechanisms 88 respectively, and at this time, the driving mechanism 88 correspondingly selects a linear driving mechanism or a rotary driving mechanism for adaptation. Further, the transmission gear 82 and the rack 81 are used as the linear-rotary motion converting mechanism, and alternatively, other linear-rotary motion converting mechanisms such as a combination of worm gears, a cylindrical cam mechanism, and the like may be employed.

In the actual use process, the single-side quick-frying condition of the kitchen range under the range hood is more, but the other side is not used or smoke is not fed, and the cooking state can be switched between big and small smoke. The oil filtering capacity and the resistance are a pair of contradictions related to the oil filtering capacity and the resistance, and the oil filtering capacity and the resistance are difficult to be compatible with each other on a common range hood, and in the invention, the gap between the filter screens 5 can be adjusted and fixed according to the condition of working condition oil smoke through the movement of the movable filter screen 4, so that the resistance and the oil filtering capacity are changed, the problems that large oil smoke needs large air quantity and oil filtering can be ignored temporarily, small oil smoke needs to mainly solve the contradiction of oil filtering, the oil smoke is preferentially ensured by large oil smoke, and the oil filtering is preferentially ensured by small oil smoke are solved. The side with the oil smoke is opened and the uncooled side is closed by the movement of the auxiliary smoke guide plate.

In the invention, the large oil smoke and the small oil smoke refer to the actual working state flow of the range hood after being installed at the user's home, the flow can be defined according to the laboratory test condition, and the flow dividing line can be preferably between 6 and 10m ³ And/min. Depending on the height of the hanging machine and the type of the machine, such as the standard installation of the top-suction type range hood (the installation range is 650-750mm defined by national standard), the flow limit of 700mm from the table surface can be 9m ³ While when the installation height is adjusted to 750mm, the parting line thereof needs to be lifted to 10m ³ Left and right to reduce oil smoke escape.

Referring to fig. 2, in the first operating state of the range hood according to the present invention, the range hood is suitable for the case of about cooking conditions, and is small in oil smoke, at this time, the second slider 78 is located at the middle position, the slider fixing block 74 is located at the lowest position of the second guide slot 751, the movable filter screen 4 is located at the middle position in the left-right direction, and the gap between the movable filter screen 4 and the fixed filter screen 5 is smaller, at this time, the oil filtering is preferential, and the oil filtering is sufficient, so as to improve the oil separation index; the first slider 77 and the first slider bar 79 are not in contact, and the two auxiliary smoke baffle plates are in an opened state (opened means almost flush with the main smoke guide plate 61), so that the channels on both sides are consistent, and the negative pressure is more expanded relative to the common range hood.

Referring to fig. 6 to 8, in the second operating state of the range hood according to the present invention, the range hood is suitable for the case of about cooking conditions, and is almost the same as the case of big oil smoke, at this time, the second slide block 78 is located at the middle position, the slide block fixing block 74 is located at the uppermost position of the second guide slot 751, the movable filter screen 4 is located at the middle position in the left-right direction, and the gap between the movable filter screen 4 and the fixed filter screen 5 is larger, at this time, the air intake is preferential, the oil smoke is fully discharged, and the sucked index is improved; the first slider 77 and the first slider bar 79 are not in contact, and the two auxiliary smoke baffle plates are in an opened state (opened means almost flush with the main smoke guide plate 61), so that the channels on both sides are consistent, and the negative pressure is more expanded relative to the common range hood.

Referring to fig. 9 to 11, in a third operating state of the range hood according to the present invention, the range hood is suitable for a case where the difference between the left and right cooking states is small and the left side is small, at this time, the second slider 78 is located at a right position, the slider fixing block 74 is located in the middle of the second guide groove 751, the movable filter screen 4 is located at a right position, and the gap between the movable filter screen 4 and the fixed filter screen 5 is small, at this time, the oil filtering is prioritized and the oil filtering is sufficiently performed; the first slide bar 79 and the second slide bar 80 on the right side are contacted to push the first slide bar and the second slide bar to slide downwards, and the auxiliary smoke baffle on the right side is in an inward closing state (preferably vertical) so that the left side is a main air inlet channel. Vice versa, see fig. 15-17.

Referring to fig. 12 to 14, in a fourth state of the range hood according to the present invention, the range hood is adapted to a case where the difference between the left and right cooking states is large, and the left side is large and the right side is small, at this time, the second driven wheel 74 is driven to a position located at a lower middle of the right side of the fixed gear 71, the fixed bracket 75 extends vertically to a middle position located in the left and right direction, the movable filter screen 4 is close to the right side, and the gap between the movable filter screen and the fixed filter screen 5 is small, at this time, the oil filtration is prioritized, and the oil filtration is sufficiently performed; the first slider 77 on the right side contacts with the first sliding bar 79 to push the first slider to slide downwards, and the auxiliary smoke baffle on the right side is in an inward turnover state (preferably at an angle of 60 degrees with respect to the horizontal direction), so that the left side is a main air inlet channel. Vice versa, see fig. 19 and 20.

Referring to fig. 21, an eighth state of the operation of the range hood according to the present invention is that the opening angle of the first auxiliary smoke guide plate 62 on the left side is increased, for example, 40 ° from the horizontal, and the left side is slightly smaller than the right side on the basis of fig. 19 and 20.

The range hood provided by the invention has the following control methods. The first control method can set position sensors on the second sliding block 78, and the two oil smoke sensors can be combined for use, wherein the two oil smoke sensors can be respectively set at the bottoms of the left side and the right side of the fume collecting hood 1, and the fume collecting hood has no power or current detection feedback. Referring to fig. 22, the method specifically comprises the following steps:

1) Starting the range hood, and operating in a default gear;

2) Reading oil smoke sensor information, including information of a left oil smoke sensor a and a right oil smoke sensor b, to obtain current left oil smoke concentration ya and right oil smoke concentration yb;

3) Comparing whether the current oil smoke concentration detected by the oil smoke sensor has obvious difference or not, and correspondingly controlling according to the comparison result, wherein ya represents the oil smoke concentration value at the left side, yb represents the oil smoke concentration value at the right side, the reference values are m1 and m2, wherein m1 represents the preset difference lower limit value, m2 represents the preset difference upper limit value, the relation between the difference proportion of the oil smoke concentration values at the left side and the right side and the gap can be obtained in advance through experiments or experience values and stored in a control module of the range hood, and in the step, the gap between the movable filter screen 4 and the fixed filter screen 5 in a large oil smoke scene is also controlled to be larger than the gap between the movable filter screen 4 and the fixed filter screen 5 in a small oil smoke scene:

3.1 If (1)If the oil concentration at two sides has obvious large difference, the larger value in ya and yb is marked as yd, the larger value is compared with a preset oil smoke concentration threshold y1, and corresponding control is carried out according to the comparison result:

3.1.1 If yd > y1, representing a large oil smoke scene with large difference on the left side and the right side, comparing ya with ub, and controlling correspondingly according to the comparison result:

3.1.1.1 If ya > yb, controlling the first auxiliary smoke guide plate 62 on the left to be opened and flattened, positioning the movable filter screen 4 on the right channel, closing the second auxiliary smoke guide plate 63 on the right by folding, and then entering the step 4);

3.1.1.2 If ya < yb, controlling the second auxiliary smoke guide 63 on the right to be opened and flattened, positioning the movable filter screen 4 in the left passage while the first auxiliary smoke guide 62 on the left is closed by folding, and then proceeding to step 4);

3.1.2.1 If ya > yb, controlling the first auxiliary smoke guide plate 62 on the left to be opened and flattened, positioning the movable filter screen 4 on the right channel, closing the second auxiliary smoke guide plate 63 on the right by folding, and then entering the step 4);

3.1.2.2 If ya < yb, controlling the second auxiliary smoke guide 63 on the right to be opened and flattened, positioning the movable filter screen 4 in the left passage while the first auxiliary smoke guide 62 on the left is closed by folding, and then proceeding to step 4);

3.2 If (1)The oil smoke concentration on both sides is considered to have smaller difference, and both sides are according to +.>And->The size and relative proportion of the two auxiliary smoke guide plates, and the position of the movable filter screen 4 is also determined by the linkage with the auxiliary smoke guide plates;

3.3 If (1)If the oil smoke concentration at two sides is not different, marking the larger value of ya and yb as yd, comparing the larger value with a preset oil smoke concentration threshold value y1, and according to the ratioThe result is to control correspondingly, in this step, the gap between the movable filter screen 4 and the fixed filter screen 5 in the big oil smoke scene is larger than the gap between the movable filter screen 4 and the fixed filter screen 5 in the small oil smoke scene, and the two auxiliary smoke guide plates are opened to be flattened:

3.3.1 If yd > y1, representing a scene of about big oil smoke, controlling the movable filter screen 4 to be positioned at the middle position in the left-right direction, and then entering the step 4);

3.3.2 If yd is less than or equal to y1, representing a scene of about little oil smoke, controlling the movable filter screen 4 to be positioned at the middle position in the left-right direction, and then entering the step 4);

4) The current position information of the movable filter screen 4 and each auxiliary smoke guide plate is obtained through the respective position sensors on the movable filter screen, the first auxiliary smoke guide plate 62 and the second auxiliary smoke guide plate 63;

5) Judging whether the current positions of the movable filter screen 4 and each auxiliary smoke guide plate are matched with the current cooking scene, if yes, returning to the step 2), if not, driving the movable filter screen 4 and each auxiliary smoke guide plate to the corresponding state by the driving mechanism 88, and returning to the step 4 after waiting for a time interval delta ta.

In the above control flow, use is made ofThe comparison reference value is because the oil smoke concentration value of the oil smoke sensor is considered to be relatively large in dynamic change, the oil smoke concentration value needs to be converted into a certain characteristic range, and a preset value is conveniently set when the oil smoke sensor leaves a factory and is relatively well compared with the preset value. Thus consider conversion to [0,1 ]]In the range of (1), the thresholds of m1, m2 and the like are conveniently set. Meanwhile, the denominator adopts the value obtained by subtracting the oil smoke concentration values detected by the two sensors, and the size can reflect the relative difference (big difference, small difference and larger difference); however, when the values of two different environments or different cooking stages are compared, the problem that the dynamic change of the oil smoke concentration value is relatively large may result in that the two stage values cannot be directly compared by using the front and rear sets of subtracted values, for example, the oil smoke concentration values of ya, yb, ya ', yb' are different by more than ten times, even hundreds of times.

Therefore, in the present embodiment, the adoption ofI.e. the comparison ranges can be all converted to 0,1]In, the left and right difference can be presented, so that the comparison of the left and right cooking differences under different cooking conditions of different moments, different user environments and different fuming cooking is convenient.

For example:

time a ya=100, yb=700, and the unit may be mg/m ³ Or other unified units;

at time B ya=1000, yb=5000, the unit may be mg/m ³ Or other uniform units.

If the difference between the two times before and after the direct comparison is carried out, the difference is 600VS 4000 which is different by 1 order of magnitude and cannot be compared. By adopting the comparison method of the invention, the difference of the A moment is |100-700|/|100+700|=0.75, the difference of the B moment is |1000-5000|/|1000+5000|=0.66, and the two can be conveniently compared, and the obvious difference of the A moment is larger.

The second control method is different from the first control method in that the range hood has power or current detection feedback and can adjust air quantity or gear. Referring to fig. 23, the method specifically comprises the following steps:

1) Starting the range hood, and operating in a default gear;

3.2 If (1)The oil smoke concentration on both sides is considered to have smaller difference, and both sides are according to +.>Andthe size and relative proportion of the two auxiliary smoke guide plates, and the position of the movable filter screen 4 is also determined by the linkage with the auxiliary smoke guide plates;

3.3 If (1)If the oil smoke concentration on two sides is not different, the larger value in ya and yb is marked as yd, the larger value is compared with a preset oil smoke concentration threshold y1, corresponding control is carried out according to the comparison result, in the step, the gap between the movable filter screen 4 and the fixed filter screen 5 in a large oil smoke scene is also controlled to be larger than the gap between the movable filter screen 4 and the fixed filter screen 5 in a small oil smoke scene, and the two auxiliary smoke guide plates are opened to be flattened:

5) Judging whether the current positions of the movable filter screen 4 and each auxiliary smoke guide plate are matched with the current cooking scene, if yes, entering a step 6), if not, driving the movable filter screen 4 and each auxiliary smoke guide plate to a corresponding state by a driving mechanism 88, and returning to the step 4 after waiting for a time interval delta ta;

6) Acquiring current power or rotating speed and power or rotating speed coefficient of the current position, and calculating to obtain the current flow Qm flowing through the fan system 3;

7) Judging whether Qm is in [ Qx, qd ] of the corresponding scene, wherein Qx and Qd are respectively the upper limit value and the lower limit value of the corresponding scene, if yes, entering step 8), and if no, entering step 9);

9) Judging whether Qm is larger or smaller, if Qm is larger, namely Qm > Qd, entering step 10), and if Qm is smaller, namely Qm < Qx, entering step 12);

10 Judging whether the gear or the rotating speed of the fan system 3 of the current range hood is the lowest, if so, entering the step 11); if not, the 1 st gear is turned down, and the step 6) is returned;

11 Judging whether the gap between the movable filter screen 4 and the fixed filter screen 5 is minimum, if so, prompting maintenance; if not, driving the movable filter screen 4 to move downwards, reducing the gap, and returning to the step 6);

13 Judging whether the gap between the movable filter screen 4 and the fixed filter screen 5 is maximum, if yes, prompting cleaning, if not, driving the movable filter screen 4 to move upwards, adjusting the gap, and returning to the step 6).

The third control method is different from the range hood structure utilized by the second control method in that the second sliding block 78 is not provided with a position sensor, the driving mechanism 88 is only used for detecting the rotation step, or the rotation angle is calculated based on the rotation speed and the time product to judge the positions of the movable filter screen and the auxiliary smoke guide plate, the range hood is provided with a temperature sensor, the range hood can be automatically switched to be in a range hood state, and whether the current mode is met or not is confirmed in the middle according to feedback of air quantity calculation so as to adjust the state. Referring to fig. 24, the method specifically comprises the following steps:

1) The range hood stands by, and the temperature sensor monitors operation;

2) Recording a group of left and right temperature information, and acquiring the value of a left temperature sensor L and the value of a right temperature sensor R;

3) Judging whether 2 groups of different time values exist, if so, entering a step 4); if not, returning to the step 2) after waiting for the time interval delta t;

4) Calculating left-right temperature change slopes, a left-side temperature change slope kL= (TL 2-TL 1)/Δt and a right-side temperature change slope kR= (TR 2-TR 1)/Δt; TL2 and TL1 are values of two sets of left side temperature sensors, wherein TL2 time is later, TR2 and TR1 are values of two sets of right side temperature sensors, wherein TR2 time is later;

5) Reading stored left and right temperature change slope reference values kLa and kRa;

6) Comparing kL with kLa, kR and kRa respectively, if |kL| > kLa and kL is positive, starting the range hood to smoke, and entering the step 8); if |kL| > kLa and kL is negative, or |kL|+.ltoreq kLa, then go to step 7); if the I kR I is more than kRa and the kR is positive, starting the smoke exhaust ventilator to smoke, and entering the step 8); if |kR| > kRa and kR is negative, or |kR|+. kRa, then go to step 7);

7) Judging whether TR2 is smaller than a preset right-side temperature reference value Tra and TL2 is smaller than a preset left-side temperature reference value TLa, if so, not starting the range hood, if not, starting the range hood to smoke, and entering step 8);

8) Comparing kL and kR, if kL-kR > kθ, indicating that the left smoking is the main smoking, and entering step 9); if the I kL-kR I is less than kθ, the left side and the right side are the same, and the step 9 is entered; if kR-kL > kθ, then the right smoking is the main smoking, and step 9 is entered; kθ is a threshold value of a preset temperature change slope difference value;

9) Judging whether temperature value suddenly changes, if yes, adjusting the movable filter screen 4 and each auxiliary smoke guide plate to a large oil smoke position in a corresponding cooking state for operation, and if the left side or the right side is used as a main part, controlling a channel of the movable filter screen 4 on the opposite side, closing the auxiliary smoke guide plates on the same side as the movable filter screen 4 (the auxiliary smoke guide plates on the other side are kept open and are in a flattening state), wherein a larger gap is reserved between the movable filter screen 4 and the fixed filter screen 5, and if the left side and the right side are the same, controlling the movable filter screen 4 to be positioned at a middle position in the left-right direction, and opening both the auxiliary smoke guide plates; a fan system defaults to a large gear, and the step 10) is entered; if not, the movable filter screen 4 and each auxiliary smoke guide plate are adjusted to the corresponding cooking state to run at the small oil smoke position, at the moment, if the left side or the right side is mainly used for sucking oil smoke, the channel of the movable filter screen 4 on the opposite side is controlled, the auxiliary smoke guide plates on the same side with the movable filter screen 4 are closed (the auxiliary smoke guide plates on the other side are kept open and are in a flattening state), a small gap is reserved between the movable filter screen 4 and the fixed filter screen 5, and if the left side and the right side are the same, the movable filter screen 4 is controlled to be positioned at the middle position in the left-right direction, and the two auxiliary smoke guide plates are opened; a fan system defaults to a small gear, and the step 10) is entered; in the step, the gap between the movable filter screen 4 and the fixed filter screen 5 in the large oil smoke scene is larger than the gap between the movable filter screen 4 and the fixed filter screen 5 in the small oil smoke scene;

11 Judging whether the position matches the current cooking scene, if yes, entering step 12), if not, driving each movable filter screen to a corresponding state by the driving mechanism 76, and returning to step 10) after waiting for a time interval delta ta;

12 Acquiring current power or rotating speed and power or rotating speed coefficient of the current position, and calculating to obtain the flow Qm of the fan system 3 flowing through the range hood at present;

13 Judging whether Qm is in [ Qx, qd ] of the corresponding scene, wherein Qx and Qd are respectively the upper limit value and the lower limit value of the corresponding scene, if yes, entering step 14), and if no, entering step 15);

14 If yes, writing and updating preset values of gears and positions of the current scene, and resetting s=0; if not, continuing to monitor, and returning to the step 2);

15 Judging whether Qm is larger or smaller, if so, namely Qm > Qd, entering step 16), and if so, namely Qm < Qx, entering step 18);

16 Judging whether the gear or the rotating speed of the fan system 3 of the current range hood is the lowest, if so, entering a step 17); if not, the 1 st gear is turned down, and the step is returned to the step 12);

17 Judging whether the gap between the movable filter screen 4 and the fixed filter screen 5 is minimum, if so, prompting maintenance; if not, driving the movable filter screen 4 to move downwards, reducing the gap, and returning to the step 12);

18 Judging whether the gear or the rotating speed of the fan system 3 of the current range hood is highest, if so, entering a step 19); if not, the 1 st gear is turned up, and the step is returned to the step 12);

19 Judging whether the gap between the movable filter screen 4 and the fixed filter screen 5 is maximum, if so, prompting maintenance; if not, the movable filter screen 4 is driven to move upwards, the gap is widened, and the step returns to the step 12).

In the fourth control method, the rotation step is detected only by the driving mechanism, or the rotation angle is calculated based on the rotation speed and the time product, so that the position of the second sliding block is obtained, and the mode selected by the user or the feedback value of other sensors can be accepted. Referring to fig. 25, the method specifically comprises the following steps:

2) User input or electric feedback of a smoke stove or smoke, an infrared sensor and the like, a cooking state is obtained, and finally the cooking state is reflected as the current oil smoke quantity on the left side and the right side;

3) Judging whether the difference of the oil smoke amounts at the left side and the right side is larger than a preset threshold value, if so, comparing the oil smoke amounts or the temperatures, wherein the judging mode can be as described in a first control method, a second control method and a third control method, and also can adopt a judging method commonly used in the field; if yes, the obvious difference exists between the two sides, the step 4) is entered, and if not, the step 6) is entered;

4) The driving mechanism is started to control the movable filter screen 4 to be positioned on one side of the large oil smoke, the auxiliary smoke guide plate on the side is opened to be flattened, and the auxiliary smoke guide plate on the other side is closed in a furling way;

5) Waiting for a time interval delta t, reading the position of the movable filter screen 4 (simultaneously acquiring the position of each auxiliary smoke guide plate) according to the rotation step or the angle of the driving mechanism, judging whether the movable filter screen 4 and each auxiliary smoke guide plate are adjusted to be in place by the movement mechanism, if so, returning to the step 2), and if not, repeating the step;

6) Reading the position of the current movable filter screen 4 (simultaneously obtaining the position of each auxiliary smoke guide plate) according to the rotation step or the angle of the driving mechanism;

7) Judging whether the positions of the current movable filter screen 4 and each auxiliary smoke guide plate are in accordance with the cooking state, if yes, returning to the step 2), and if not, driving the movable filter screen 4 and each auxiliary smoke guide plate to run to the corresponding position;

8) And (4) waiting for a time interval delta t, reading the position of the movable filter screen 4 again (simultaneously acquiring the position of each auxiliary smoke guide plate), judging whether the movable filter screen 4 and each auxiliary smoke guide plate are adjusted to be in place by the movement mechanism, if so, returning to the step (2), and if not, repeating the step.

Claims

1. The utility model provides a range hood, includes collection petticoat pipe (1), sets up fan frame (2) and fan system (3) of setting in fan frame (2) above collection petticoat pipe (1), set up air intake (11) on collection petticoat pipe (1), air intake (11) department is provided with fixed filter screen (5), the below of fixed filter screen (5) is provided with smoke guide plate subassembly, smoke guide plate subassembly is including main smoke guide plate (61) that are located the centre; the method is characterized in that:

A movable filter screen (4) is arranged below the fan system (3) in the fan frame (2), the movable filter screen (4) transversely extends, and the movable filter screen (4) can move up and down and left and right, so that the air inlet states of a left side channel and a right side channel below the fan system (3) in the fan frame (2) and the gap between the movable filter screen (4) and a fixed filter screen (5) are changed;

the smoke guide plate assembly further comprises a first auxiliary smoke guide plate (62) positioned at the left side of the main smoke guide plate (61) and a second auxiliary smoke guide plate (63) positioned at the right side of the main smoke guide plate (61), and the first auxiliary smoke guide plate (62) and the second auxiliary smoke guide plate (63) can rotate around an axis extending forwards and backwards so as to open and close an air inlet channel at the corresponding side;

the fan frame (2) is internally provided with a movement mechanism capable of driving the movable filter screen (4), the movement mechanism comprises an output gear (72), a slide block fixing block (74), a fixing support (75) and a first slide block (77), the fixing support (75) is fixedly arranged on the inner side of the fan frame (2), the first slide block (77) is in sliding fit with the fixing support (75) and can move up and down along the fixing support (75), the first slide block (77) is rotationally connected with the output gear (72), the rotation axis of the output gear (72) extends along the front-back direction, the slide block fixing block (74) is rotationally connected with the eccentric position of the output gear (72), so that the slide block fixing block (74) can be driven by the output gear (72) to move up and down and left and right, and the slide block fixing block (74) is also used for being fixedly connected with the movable filter screen (4);

The motion mechanism further comprises a second sliding block (78), the sliding block fixing block (74) is in sliding fit with the second sliding block (78) and can move up and down along the second sliding block (78), and the second sliding block (78) can be driven by the sliding block fixing block (74) to move left and right;

the motion mechanism further comprises a first sliding rod (79), a second sliding rod (80) and pushing blocks (84), wherein the first sliding rod (79) is provided with two pushing blocks and is respectively and fixedly arranged on the left side and the right side of the second sliding rod (78), the second sliding rod (80) is provided with two pushing blocks and is respectively arranged on the left side and the right side in the fan frame (2), the second sliding rod (80) longitudinally extends and downwardly extends to the lower portion of the air inlet (11), each second sliding rod (80) corresponds to one pushing block (84), the pushing blocks (84) are arranged on the main smoke guide plate (61), the second sliding rod (80) can be pushed to downwardly move when the first sliding rod (79) moves in the direction far away from the other first sliding rod (79), and the pushing blocks (84) can be pushed to move in the direction far away from the other pushing blocks (84) when the second sliding rod (80) downwardly so as to drive the corresponding auxiliary smoke guide plates to rotate, and each auxiliary smoke guide plate keeps open to be in a flattened trend.

2. The range hood of claim 1, wherein: the motion mechanism further comprises a driving wheel (71), a gear limiting frame (73) and a driving mechanism (88) for driving the driving wheel (71) to rotate along an axis extending forwards and backwards, the driving wheel (71) is meshed with the output gear (72), the driving wheel (71) is connected with the output gear (72) through the gear limiting frame (73), and the gear limiting frame (73) is fixedly connected with the driving wheel (71) and is rotatably connected with the center of the output gear (72).

3. The range hood of claim 1, wherein: the first slide bar (79) is the shape of buckling, a part of first slide bar (79) extends along left and right direction and another part then extends along fore-and-aft direction after buckling, the bottom surface of the part that extends around first slide bar (79) is the slope form and by the side that is close to each other upwards slope gradually to the side that is away from each other, the upper end of second slide bar (80) can cooperate with the part that extends around first slide bar (79) of relevant position for first slide bar (79) can promote second slide bar (80) to move downwards.

4. A range hood according to claim 3, wherein: the lower end face of the second sliding rod (80) gradually inclines upwards from the end close to each other to the end far away, and the upper end face of the pushing block (84) gradually inclines upwards from the end close to each other to the end far away, so that the second sliding rod (80) can push the pushing block (84) to move.

5. A range hood according to claim 3, wherein: the motion mechanism further comprises a rack (81) arranged on the upper surface of the main smoke guide plate (61), a transmission gear (82) meshed with the rack (81) and a transmission shaft (86) rotationally connected with the main smoke guide plate (61), the transmission shaft (86) can rotate around an axis extending forwards and backwards, the rack (81) extends in the left-right direction, each auxiliary smoke guide plate corresponds to one rack (81) and the transmission shaft (86), the pushing block (84) is arranged at the end part, close to each other, of the rack (81), of the rack, the pushing block (84) and the rack (81) synchronously move, and the transmission gear (82) is wound on the transmission shaft (86) to synchronously rotate; each auxiliary smoke guide plate is fixedly connected with a transmission shaft (86) on the corresponding side so as to synchronously rotate.

6. The range hood of claim 1, wherein: the motion mechanism further comprises two supports (87) and elastic pieces (83), wherein the supports (87) are arranged between the two pushing blocks (84), each support (87) corresponds to one pushing block (84), the elastic pieces (83) are connected between each support (87) and the corresponding pushing block (84), and the elastic pieces (83) keep the trend of the pushing blocks (84) moving towards the supports (87) due to the force exerted by the elastic pieces (83), so that the corresponding auxiliary smoke guide plates keep the flattening trend.

7. A control method of a range hood according to any one of claims 1 to 6, characterized by: the method comprises the following steps:

1) Starting the range hood, and operating in a default gear;

3.1 If the difference between ya and yb exceeds m2, then ya and yb are compared and controlled accordingly according to the result of the comparison, and in this step, the gap between the movable screen (4) and the fixed screen (5) in the large oil smoke scene is also controlled to be larger than the gap between the movable screen (4) and the fixed screen (5) in the small oil smoke scene:

3.1.1.1 If ya > yb, controlling the first auxiliary smoke guide plate (62) on the left side to be opened and flattened, enabling the movable filter screen (4) to be positioned in the right side channel, and enabling the second auxiliary smoke guide plate (63) on the right side to be folded and closed, and then entering the step 4);

3.1.1.2 If ya < yb, controlling the second auxiliary smoke guide plate (63) on the right side to be opened and flattened, and enabling the movable filter screen (4) to be positioned in the left channel, and enabling the first auxiliary smoke guide plate (62) on the left side to be folded and closed, and then entering the step 4);

3.1.2.1 If ya > yb, controlling the first auxiliary smoke guide plate (62) on the left side to be opened and flattened, enabling the movable filter screen (4) to be positioned in the right side channel, and enabling the second auxiliary smoke guide plate (63) on the right side to be folded and closed, and then entering the step 4);

3.1.2.2 If ya < yb, controlling the first auxiliary smoke guide plate (62) on the left side to be opened and flattened, enabling the movable filter screen (4) to be positioned in the right side channel, and enabling the second auxiliary smoke guide plate (63) on the right side to be folded and closed, and then entering the step 4);

3.3 If the difference between ya and yb is smaller than m1, the oil smoke concentration at two sides is considered to be no difference, the larger value in ya and yb is marked as yd, yd is compared with a preset oil smoke concentration threshold y1, corresponding control is carried out according to the comparison result, in the step, the gap between a movable filter screen (4) and a fixed filter screen (5) in a large oil smoke scene is also controlled to be larger than the gap between the movable filter screen (4) and the fixed filter screen (5) in a small oil smoke scene, and the two auxiliary smoke guide plates are opened to be flattened:

3.3.1 If yd > y1, representing a scene of about big oil smoke, controlling the dynamic filter screen (4) to be positioned at the middle position in the left-right direction, and then entering the step 4);

3.3.2 If yd is less than or equal to y1, representing a scene of about little oil smoke, controlling the dynamic filter screen (4) to be positioned at the middle position in the left-right direction, and then entering the step 4);

4) Acquiring current position information of the movable filter screen (4) and each auxiliary smoke guide plate;

5) Judging whether the current positions of the movable filter screen (4) and each auxiliary smoke guide plate are matched with the current cooking scene, if yes, returning to the step 2), if not, driving the movable filter screen (4) and each auxiliary smoke guide plate to the corresponding state, and returning to the step 4 after waiting for a time interval delta ta.

8. The control method of a range hood according to claim 7, wherein: in step 3), ifJudging that the difference between ya and yb exceeds m2; if->Judging that the difference between ya and yb is between m1 and m2; if->The difference between ya and yb is considered to be less than m1.

9. A control method of a range hood according to any one of claims 1 to 6, characterized by: the method comprises the following steps:

1) Starting the range hood, and operating in a default gear;

5) Judging whether the current positions of the movable filter screen (4) and each auxiliary smoke guide plate are matched with the current cooking scene, if so, entering the step 6), if not, driving the movable filter screen (4) and each auxiliary smoke guide plate to the corresponding state, and returning to the step 4 after waiting for a time interval Ata;

6) Acquiring the current flow Qm flowing through the fan system (3);

9) If Qm > Qd, go to step 10), if Qm < Qx, go to step 12);

10 Judging whether the gear or the rotating speed of a fan system (3) of the current range hood is the lowest, if so, entering a step 11); if not, the 1 st gear is turned down, and the step 6) is returned;

11 Judging whether the gap between the movable filter screen (4) and the fixed filter screen (5) is minimum, and if so, prompting maintenance; if not, driving the movable filter screen (4) to move downwards, reducing the gap, and returning to the step 6);

12 Judging whether the gear or the rotating speed of a fan system (3) of the current range hood is highest, if so, entering a step 13); if not, the 1 st gear is turned up, and the step 6) is returned;

13 Judging whether the gap between the movable filter screen (4) and the fixed filter screen (5) is maximum, if so, prompting cleaning, and if not, driving the movable filter screen (4) to move upwards, enlarging the gap, and returning to the step 6).

10. The control method of a range hood according to claim 9, wherein: in step 3), ifJudging that the difference between ya and yb exceeds m2; if->Judging that the difference between ya and yb is between m1 and m2; if->The difference between ya and yb is considered to be less than m1.

11. A control method of a range hood according to any one of claims 1 to 6, characterized by: the method comprises the following steps:

1) The range hood stands by;

9) Judging whether the temperature value is suddenly changed, if so, adjusting to the large oil smoke position under the corresponding cooking scene to operate, defaulting a fan system (3) to a large gear, and entering a step 10); if not, adjusting to the small oil smoke position in the corresponding cooking scene to run, and enabling the fan system (3) to default a small gear to enter the step 10);

10 Acquiring current position information of the movable filter screen (4) and each auxiliary smoke guide plate;

12 Obtaining the flow Qm of the current fan system (3);

15 If Qm > Qd, enter step 16), if Qm < Qx, enter step 18);

16 Judging whether the gear or the rotating speed of a fan system (3) of the current range hood is the lowest, if so, entering a step 17); if not, the 1 st gear is turned down, and the step is returned to the step 12);

17 Judging whether the gap between the movable filter screen (4) and the fixed filter screen (5) is minimum, and if so, prompting maintenance; if not, driving the movable filter screen (4) to move downwards, reducing the gap, and returning to the step 12);

18 Judging whether the gear or the rotating speed of a fan system (3) of the current range hood is highest, if so, entering a step 19); if not, the 1 st gear is turned up, and the step is returned to the step 12);

19 Judging whether the gap between the movable filter screen (4) and the fixed filter screen (5) is maximum, if so, prompting cleaning, and if not, driving the movable filter screen (4) to move upwards, enlarging the gap, and returning to the step 12).

12. The control method of a range hood according to claim 11, wherein: in the step 9), if the scene is a large oil smoke scene, when the left side or the right side is mainly used for exhausting oil smoke, a channel of the movable filter screen (4) on the opposite side to the large oil smoke is controlled, an auxiliary smoke guide plate on the same side with the movable filter screen (4) is folded and closed, and the auxiliary smoke guide plate on the other side is kept open to be in a flattened state; when the left side and the right side are the same, the movable filter screen (4) is controlled to be positioned at the middle position in the left-right direction, and the two auxiliary smoke guide plates are opened; if the small oil smoke scene is the small oil smoke scene, when the left side or the right side is mainly used for exhausting oil smoke, a channel of the movable filter screen (4) positioned at the opposite side of the small oil smoke is controlled, and an auxiliary smoke guide plate at the same side of the movable filter screen (4) is folded and closed; when the left side and the right side are the same, the movable filter screen (4) is controlled to be positioned at the middle position in the left-right direction, and the two auxiliary smoke guide plates are opened to be flattened; in the step, the gap between the movable filter screen (4) and the fixed filter screen (5) in the large oil smoke scene is larger than the gap between the movable filter screen (4) and the fixed filter screen (5) in the small oil smoke scene.

13. A control method of a range hood according to any one of claims 1 to 6, characterized by: the method comprises the following steps:

2) Acquiring current oil smoke amounts at the left side and the right side;

4) The control filter screen (4) is positioned at one side of the large oil smoke, the auxiliary smoke guide plate at the side is opened to be flattened, and the auxiliary smoke guide plate at the other side is folded and closed;

5) Waiting for a time interval delta t, reading the positions of the movable filter screen (4) and each auxiliary smoke guide plate, judging whether the positions of the movable filter screen (4) and each auxiliary smoke guide plate are in accordance with a cooking state, returning to the step 2) if yes, and repeating the step if no;

6) Reading the positions of a current movable filter screen (4) and each auxiliary smoke guide plate;

7) Judging whether the positions of the current movable filter screen (4) and each auxiliary smoke guide plate are in accordance with the cooking state, if yes, returning to the step 2), and if not, driving the movable filter screen (4) and each auxiliary smoke guide plate to run to the corresponding position;

8) And (3) waiting for a time interval delta t, reading the positions of the movable filter screen (4) and each auxiliary smoke guide plate again, judging whether the positions of the movable filter screen (4) and each auxiliary smoke guide plate are in accordance with the cooking state, if so, returning to the step (2), and if not, repeating the step.