CN113834103A

CN113834103A - Range hood and control method thereof

Info

Publication number: CN113834103A
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: 2021-12-24
Anticipated expiration: 2041-09-08
Also published as: CN113834103B

Abstract

The invention discloses a range hood and a control method thereof, and the range hood comprises a smoke collecting hood, a fan frame arranged above the smoke collecting hood and a fan system arranged in the fan frame, wherein the smoke collecting hood is provided with an air inlet, 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 extends transversely, and the movable filter screen can move up and down and left and right, so that the air inlet states of a left channel and a right channel below the fan system in the fan frame and the gaps between the movable filter screen and the fixed filter screen are changed; lead cigarette board subassembly still including lieing in leading the left first supplementary cigarette board of leading cigarette board and lieing in leading the supplementary cigarette board of second on cigarette board right side, first supplementary cigarette board of leading and the supplementary cigarette board homoenergetic of second are rotated around the axis that extends around.

Description

Range hood and control method thereof

Technical Field

The invention relates to an oil fume purification 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 household electrical appliances in modern families. The range hood works by utilizing the fluid dynamics principle, sucks and exhausts oil smoke through a centrifugal fan arranged in the range hood, and filters partial grease particles by using a filter screen. The centrifugal fan comprises a volute, an impeller arranged in the volute and a motor driving the impeller to rotate. When the impeller rotates, negative pressure suction is generated in the center of the fan, oil smoke below the range hood is sucked into the fan, accelerated by the fan and then collected and guided by the volute to be discharged out of a room.

The top-suction type range hood adopts an oil smoke rising principle, a negative pressure area is generated right above a cooking bench to suck and exhaust naturally rising oil smoke generated during cooking, and the range hood has the advantages of fashionable and concise appearance, larger air volume, larger space and capability of capturing the oil smoke far away from the cooking bench, and has the defects that the installation height is far away from the cooking bench, and the oil smoke above a pot is easy to be disturbed by ambient air to cause the escape of the oil smoke to the periphery under the cooking state with small oil smoke volume, so that the oil smoke suction effect is poor.

Therefore, a smoke guide plate is generally arranged below an air inlet of the top-suction range hood to form an annular suction structure, and the oil smoke suction effect is improved by utilizing the coanda effect. The top suction type range hood with the smoke guide plate disclosed in the chinese patent with the application number of 201410419676.4 comprises a body, a smoke collecting hood and the smoke guide plate, wherein the smoke collecting hood is connected with the body, a fan is arranged in the body, an air inlet is arranged on the smoke collecting hood, the smoke guide plate is arranged right opposite to the air inlet of the smoke collecting hood and 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.

Because the range hood adopting the smoke guide plate does not drip oil and has better oil smoke absorption effect, the range hood has more and more extensive application in recent years. The existing range hood adopting the smoke guide plate often has the following disadvantages:

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

2. although the air inlet of some range hoods is adjusted along with the size of oil smoke, two sets of driving motors are generally needed to realize the adjustment respectively, 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 a range hood aiming at the defects in the prior art, which can realize the matching of the distribution of air inlet areas and resistance to cooking conditions and improve the oil smoke absorption effect.

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

The technical scheme adopted by the invention for solving the first technical problem is as follows: a range hood 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 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 extends transversely, and the movable filter screen can move up and down and left and right, so that the air inlet states of a left channel and a right channel below the fan system in the fan frame and the gaps between the movable filter screen and the fixed filter screen are changed;

lead cigarette board subassembly still including lieing in leading the left first supplementary cigarette board of leading cigarette board and lieing in leading the supplementary cigarette board of second on cigarette board right side, first supplementary cigarette board of leading and the supplementary cigarette board homoenergetic of second are rotated around the axis that extends around.

Move the motion of filter screen for the convenience of automatic drive, fan frame inside still is provided with the motion that can drive and move the filter screen, 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 and can reciprocate along the fixed bolster, first slider rotates with output gear to be connected, output gear's axis of rotation extends along the fore-and-aft direction, the slider fixed block rotates with output gear's off-centre position to can be driven by output gear and move from top to bottom and left and right sides, the slider fixed block still be used for with move the filter screen and be connected fixedly.

The motion mechanism further comprises a driving wheel, a gear limiting frame and a driving mechanism used for driving the driving wheel to rotate along the axis extending from front to back, 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 connected with the center of the output gear in a rotating mode.

In order to drive the output gear to rotate, the moving 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 plate share the same driving mechanism, so that the stability of the movement mechanism is improved, the motion mechanism also comprises a first slide bar, a second slide bar and a pushing block, the first slide bar is provided with two slide bars which are respectively and fixedly arranged at the left side and the right side of the second slide block, the second sliding rods are provided with two sliding rods which are respectively arranged at the left side and the right side in the fan frame, the second sliding rods longitudinally extend and downwards extend to the lower part of the air inlet, each second sliding rod corresponds to one pushing block, the pushing blocks are arranged on the main smoke guiding plate, when the first slide bar moves towards the direction far away from the other first slide bar, the second slide bar can be pushed to move downwards, when the second slide bar moves downwards, the pushing block can be pushed to move away from the other pushing block, thereby driving the corresponding auxiliary smoke guide plates to rotate, and keeping each auxiliary smoke guide plate open to be in a flattening trend.

In order to facilitate the left and right movement of the first slide bar to drive the second slide bar to move downwards, the first slide bar is bent, one part of the first slide bar extends along the left and right direction, the other part of the first slide bar extends along the front and back direction after being bent, the bottom surface of the part extending front and back of the first slide bar is inclined and gradually inclines upwards from one side close to one side away from the other side, and the upper end of the second slide bar can be matched with the part extending front and back of the first slide bar at the corresponding position, so that the first slide bar can push the second slide bar to move downwards.

In order to facilitate the downward movement of the second sliding rod to drive the pushing block to move left and right, the lower end face of the second sliding rod gradually inclines upwards from one end close to the lower end face of the second sliding rod to one end far away from the lower end face of the second sliding rod, and the upper end face of the pushing block gradually inclines upwards from one end close to the upper end face of the pushing block to one end far away from the lower end face of the second sliding rod, so that the second sliding rod 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 plates, the motion mechanism further comprises racks arranged on the upper surface of the main smoke guide plate, transmission gears meshed with the racks and transmission shafts in rotary connection with the main smoke guide plate, the transmission shafts can rotate around axes extending forwards and backwards, the racks extend in the left-right direction, each auxiliary smoke guide plate corresponds to one rack and one transmission shaft, the pushing blocks are arranged at the end parts of the racks close to each other, the pushing blocks and the racks move synchronously, and the transmission gears are arranged on the transmission shafts in a winding manner and can rotate synchronously; each auxiliary smoke guide plate is connected and fixed with the transmission shaft on the corresponding side and can synchronously rotate.

In order to facilitate the automatic resetting of the auxiliary smoke guide plate, the motion mechanism further comprises two supports and an elastic member, the two supports are arranged between the two pushing blocks, each support corresponds to one pushing block, the elastic member is connected between each support and the corresponding pushing block, and the elastic member applies force to the pushing blocks to keep the pushing blocks in a trend of moving towards the supports, so that the corresponding auxiliary smoke guide plate is kept in a flat-open trend.

The first technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood is characterized in that: the method comprises the following steps:

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

2) acquiring the current left oil smoke concentration ya and the current right oil smoke concentration yb;

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

3.1) if the difference between ya and yb exceeds m2, comparing ya and yb, and controlling correspondingly according to the comparison result, wherein in the step, the gap between the movable filter screen and the fixed filter screen under the large oil smoke scene is also controlled to be larger than the gap between the movable filter screen and the fixed filter screen under the small oil smoke scene:

3.1) if the difference between ya and yb is larger than m2, which indicates that the oil concentrations on the two sides are obviously large, taking the larger value of ya and yb as yd, comparing the value with a preset oil smoke concentration threshold value y1, and performing corresponding control according to the comparison result:

3.1.1) if yd is larger than y1, then representing large oil smoke scenes with large difference on the left and the right sides, then comparing ya and yb, and controlling correspondingly according to the comparison result:

3.1.1.1) if ya is more than yb, controlling the first auxiliary smoke guide plate on the left side to be kept open and flattened, positioning the movable filter screen in the right channel, and simultaneously closing the second auxiliary smoke guide plate on the right side in a furled mode, 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 kept open and flattened, positioning the movable filter screen in the left channel, and simultaneously closing the first auxiliary smoke guide plate on the left side in a furled mode, 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 large difference between the left side and the right side, then comparing ya and yb, and controlling correspondingly according to the comparison result:

3.1.2.1) if ya is more than yb, controlling the first auxiliary smoke guide plate on the left side to be kept open and flattened, positioning the movable filter screen in the right channel, and simultaneously closing the second auxiliary smoke guide plate on the right side in a furled mode, 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 kept open and flattened, enabling the movable filter screen to be positioned in the right channel, and simultaneously closing the second auxiliary smoke guide plate on the right side in a furled mode, and then entering the step 4);

3.2) if the difference between ya and yb is between m1 and m2, considering that the oil smoke concentrations at two sides are slightly different, and determining the rotation angles of the two auxiliary smoke guide plates according to ya and yb;

3.3) if the difference between ya and yb is less than m1, then the oil smoke concentration on both sides is considered to be not different, then take the bigger value in ya and yb to record as yd, compare yd with preset oil smoke concentration threshold value y1, carry out corresponding control according to the result of comparison, in this step, still control the clearance between the movable filter screen and the fixed filter screen under the big oil smoke scene to be greater than the clearance between the movable filter screen and the fixed filter screen under the little oil smoke scene, two auxiliary smoke guide plates are opened and are flattened:

3.3.1) if yd is larger than y1, indicating a left and right almost big oil smoke scene, controlling the movable filter screen to be positioned at the middle position in the left and right direction, and then entering the step 4);

3.3.2) if yd is less than or equal to y1, representing a left-right small oil smoke scene, 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) and (3) judging whether the current positions of the movable filter screen and the auxiliary smoke guide plates are matched with the current cooking scene, if so, returning to the step 2), otherwise, driving the movable filter screen and the auxiliary smoke guide plates to the corresponding states, and after waiting for a time interval delta ta, returning to the step 4).

Preferably, in step 3), if

Judging that the difference between ya and yb exceeds m 2; if it is not

The difference between ya and yb is judged to be between m1 and m 2; if it is not

Then ya and yb are considered to differ less than m 1.

The second technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood is characterized in that: the method comprises the following steps:

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

3.1) if

And if the oil concentration on the two sides is obviously different, taking the larger value of ya and yb as yd, comparing the yd with a preset oil smoke concentration threshold value y1, and performing corresponding control according to the comparison result:

5) judging whether the current positions of the movable filter screen and the auxiliary smoke guide plates are matched with the current cooking scene or not, if so, entering the step 6), otherwise, driving the movable filter screen and the auxiliary smoke guide plates to be in corresponding states, 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 and lower limit values of the corresponding cooking scene, if yes, entering step 8), and if not, entering step 9);

8) continuing monitoring, wherein the monitoring frequency s is s +1, judging whether s is greater than or equal to s1, s1 is a preset threshold value for the monitoring frequency, if so, writing the gear and the position of the current scene into a storage updating preset value, resetting s to be 0, and then 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 a fan system of the current range hood is the lowest or not, and if so, entering the step 11); if not, the 1 st gear is adjusted 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 a fan system of the current range hood is highest, if so, entering the step 13); if not, the 1 st gear is increased, and the step 6) is returned;

13) and (4) judging whether the gap between the movable filter screen and the fixed filter screen is the maximum, if so, prompting to clean, otherwise, driving the movable filter screen to move upwards, increasing the gap, and returning to the step 6).

Preferably, in step 3), if

Judging that the difference between ya and yb exceeds m 2; if it is not

Then ya and yb are considered to differ less than m 1.

The third technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood is characterized in that: the method comprises the following steps:

1) standby of the range hood;

2) recording a group of left and right temperature information, and acquiring a left temperature value and a right temperature value;

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

4) calculating the left temperature change slope kL ═ TL2-TL1)/Δ t, and calculating the right temperature change slope kR ═ TR2-TR1)/Δ t; TL2 and TL1 are two sets of left side temperature values, where TL2 times later, and TR2 and TR1 are two sets of right side temperature values, where TR2 times later;

5) reading the stored left temperature change slope reference value kLa and the right temperature change slope reference value kRa;

6) respectively comparing kL with kLa, kR and kRa, if the kL is greater than kLa and the kL is positive, starting the range hood to suck the oil smoke, and entering the step 8); if | kL | is more than kLa and kL is negative, or | kL | is less than or equal to kLa, then entering step 7); if the absolute value of kR is more than kRa and kR is positive, starting the range hood to suck the oil smoke and entering the step 8); if | kR | is > kRa and kR is negative, or | kR | ≦ kRa, then proceed 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 suck oil smoke, and entering step 8);

8) comparing kL and kR, if kL-kR is larger than k theta, indicating a cooking scene mainly comprising left-side oil smoke absorption, and entering the step 9); if the | kL-kR | is less than k theta, the same cooking scenes on the left side and the right side are represented, and the step 9) is carried out; if kR-kL is more than k theta, the cooking scene mainly including oil smoke absorption at the right side is represented, and the step 9) is carried out; k theta is a threshold value of a preset temperature change slope difference value;

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

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

11) judging whether the position is matched with the current cooking scene, if so, entering the step 12), otherwise, 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) acquiring the flow Qm of the current fan system;

13) judging whether Qm is in [ Qx, Qd ] of the corresponding cooking scene, wherein Qx and Qd are respectively the upper and lower limit values of the corresponding cooking scene, if yes, entering step 14), and if not, entering step 15);

14) continuing monitoring, wherein the monitoring frequency s is s +1, judging whether s is greater than or equal to s1, s1 is a preset threshold value for the monitoring frequency, if so, writing the gear and the position of the current cooking scene into a storage updating preset value, and resetting s to be 0; if not, continuing to monitor, and returning to the step 2);

15) if Qm > Qd, go to step 16), if Qm < Qx, go to step 18);

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

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 a fan system of the current range hood is highest, if so, entering a step 19); if not, the 1 st gear is increased, and the step 12) is returned;

19) and (4) judging whether the gap between the movable filter screen and the fixed filter screen is the maximum, if so, prompting to clean, otherwise, driving the movable filter screen to move upwards, increasing the gap, and returning to the step 12).

Preferably, in step 9), if the large-oil smoke scene is adopted, when oil smoke absorption is mainly performed on the left side or the right side, the movable filter screen is controlled to be positioned in the channel on the opposite side of the large-oil smoke, the auxiliary smoke guide plate on the same side with the movable filter screen is closed, and the auxiliary smoke guide plate on the other side is kept opened and is 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 scene is a small oil smoke scene, when oil smoke is absorbed mainly on the left side or the right side, the channel of the movable filter screen on the opposite side of the small oil smoke is controlled, and the auxiliary smoke guide plate on the same side with the movable filter screen is closed; 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 and flattened; in this 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 solution adopted by the present invention to solve the second technical problem is: a control method of the range hood is characterized in that: the method comprises the following steps:

1) starting the range hood, and operating the range hood in a default gear or in a balanced manner on the left side and the right side;

2) acquiring the current oil smoke amount of the left side and the right side;

3) judging whether the difference of the oil smoke amount of the left side and the oil smoke amount of 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 brake filter screen is positioned on one side of the large oil smoke, the auxiliary smoke guide plate on the side is unfolded and flattened, and the auxiliary smoke guide plate on 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 the 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 are in accordance 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 operate to the corresponding position;

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

Compared with the prior art, the invention has the advantages that: by arranging the movable filter screen which can adjust the gap between the double-layer filter screens and can also adjust the air inlet states of the left side and the right side and the auxiliary second-stage smoke guide plate which can be overturned, the flow distribution can be realized by overturning the second-stage smoke guide plate, the oil filtering capability can be further adjusted by matching with the change of the gap between the double-layer filter screens, and the use in multiple scenes is met; the moving of the filter screen and the overturning of the second-stage smoke guide plate are realized through one set of motion mechanism, 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 sectional view of the range hood according to the embodiment of the present invention in a first state;

FIG. 3 is a schematic view of the moving mechanism of the dynamic filter screen and the smoke deflector of the range hood of FIG. 2;

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

FIG. 5 is a partial component schematic view of FIG. 4;

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

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

FIG. 8 is a schematic view of the moving mechanism of the dynamic filter screen and the smoke deflector of the range hood of FIG. 7;

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

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

FIG. 11 is a schematic view of the moving mechanism of the dynamic filter screen and the smoke deflector of the range hood of FIG. 10;

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

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

FIG. 14 is a schematic view of the moving mechanism of the dynamic filter screen and the smoke deflector of the range hood of FIG. 13;

fig. 15 is a schematic view of a range hood in a fifth and fourth 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 the moving mechanism of the dynamic filter screen and the smoke deflector 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 in a seventh state according to the embodiment of the present invention;

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

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like 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 is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, but are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and that the directional terms are used for purposes of illustration and are not to be construed as limiting, for example, because the disclosed embodiments of the present invention may be oriented in different directions, "lower" is not necessarily limited to a direction opposite to or coincident with the direction of gravity. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1 to 6, a range hood, which is a ceiling range hood, includes a fume collecting hood 1 and a fan frame 2 disposed above the fume collecting hood 1, and a fan system 3 is disposed in the fan frame 2. The smoke collecting cover 1 is provided with an air inlet 11, so that the oil smoke can enter the fan frame 2 from the air inlet 11 in the upward 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 the 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 channel and a right channel. A movable filter screen 4 is arranged in the fan frame 2 below the fan system 3, namely on the oil smoke flow path and at the upstream of the fan system 3, and the movable filter screen 4 is preferably in a flat plate shape and can move in the fan frame 2. The air inlet 11 is provided with a fixed filter screen 5, and the fixed filter screen 5 can be a cone which is gradually reduced from top to bottom and is fixed at the air inlet 11. A smoke guide plate component is arranged below the fixed filter screen 5, and as in the prior art, oil smoke enters the fan frame 2 from the periphery of the smoke guide plate component and a channel between the smoke collecting cover 1 through the air inlet 11.

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

The smoke guide plate assembly includes a main smoke guide plate 61 located in the middle, a first auxiliary smoke guide plate 62 located on the left side of the main smoke guide plate 61, and a second auxiliary smoke guide plate 63 located on the right side of the main smoke guide 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 limit 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 on the inner side of the fan frame 2, and may be directly connected to the fan frame 2 or indirectly connected to the fan frame 2 via a mounting plate or the like. In the present embodiment, the fixing bracket 75 is provided at the rear side in the blower frame 2. The drive mechanism 88 is a rotary drive mechanism, preferably a motor, the output of which may be directly or indirectly connected to the eccentric position of the capstan 71, thereby driving the capstan 71 to rotate. The driving mechanism 88 can be connected with the driving wheel 71 through the fixing bracket 75, and the driving mechanism 88 itself can be connected and fixed with the fixing bracket 75 or the fan frame 2.

The drive pulley 71 and the output gear 72 are disposed on the front side of the fixed bracket 75, the output gear 72 is engaged with the drive pulley 71, the output gear 72 is a driven pulley, and the rotational axes 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 on the rear side of the driving wheel 71 and the rear side of the output gear 72, the gear limiting frame 73 is fixedly connected with the driving wheel 71 and is in rotating connection with the center of the output gear 72, the relative position of the driving wheel 71 and the output gear 72 is limited through the gear limiting frame 73, and separation of the two gears is avoided. The fixed bracket 75 is provided with a first guide groove 751 extending up and down, and the first slider 77 is in sliding fit with the first guide groove 751 and can slide up and down along the first guide groove 751. The first slide 77 is rotationally connected to the output gear 72, preferably to the centre of the output gear 72.

The second slider 78 is arranged on the front side of the output gear 72 and is in a T shape, a second guide groove 781 extending up and down is formed in the longitudinal extension portion of the second slider 78, and the slider fixing block 74 is in sliding fit with the second guide groove 781 and can slide up and down along the second guide groove 781. The slider fixing block 74 is rotatably coupled to the eccentric position of the output gear 72 through the second guide groove 781. The transmission rod 76 is arranged at the front side of the second slide block 78, the upper end of the transmission rod 76 is fixedly connected with the slide block fixing block 74, and the lower end of the transmission rod 76 is fixedly connected with the movable filter screen 4. In this embodiment, the movable screen 4 has a rectangular shape, and the transmission lever 76 is attached to a position intermediate in the left-right direction of the movable screen 4. The moving screen 4 remains laterally extended throughout the course of the movement.

When the driving mechanism 88 drives the driving wheel 71 to rotate, so as to drive the output gear 72 to rotate, since the driving wheel 71 is eccentrically connected with the driving mechanism 88, and the output gear 72 is slidably connected with the fixed bracket 75 through the first slide block 77, the output gear 72 can also move up and down along the fixed bracket 75; since the slider fixing block 74 is eccentrically coupled to the output gear 72, the slider fixing block 74 rotates with the output gear 72 and can rotate on its own axis, thereby moving the transmission rod 76 and the second slider 78 up and down and left and right, and the second slider 78 moves in left and right and up and down directions with a temporal separation.

The above-mentioned components of the motion mechanism are used for driving the moving filter screen 4 to move, and the motion mechanism further comprises components for driving two auxiliary smoke guide plates to move, including a first slide bar 79, a second slide bar 80, a rack 81, a transmission gear 82, an elastic element 83 and a pushing block 84. The two first slide bars 79 are respectively and fixedly disposed at left and right sides of a transverse portion of the second slider 78, the first slide bars 79 are bent, one portion of the first slide bars 79 extends along the left-right direction, the other portion of the first slide bars 79 extends along the front-back direction after being bent, preferably, the first slide bars 79 are L-shaped, and the two first slide bars 79 are symmetrically disposed. The bottom surfaces of the portions of the first slide bars 79 extending forward and rearward are inclined, and are gradually inclined upward from the sides close to each other to the sides away from each other. The second slide bar 80 is also provided with two, which are respectively arranged at the left and right sides in the fan frame 2, and the second slide bar 80 may be rod-shaped, and particularly preferably extends in the vertical direction in the longitudinal direction and extends downward below the air inlet 11. The upper end of the second slide bar 80 can be engaged with a portion of the first slide bar 79 extending forward and backward at a corresponding position, and the upper end surface of the second slide bar 80 is inclined to match 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 rack 81 is 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 rack 81 extends in the left-right direction. The mutually adjacent ends of the racks 81 are provided with the above-mentioned pushing blocks 84, and the upper end surfaces of the pushing blocks 84 are engaged with 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 from each other, 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 from each other. Therefore, when the second sliding rod 80 is pushed downwards, the pushing block 84 can be pushed to move away from the other pushing block 84, so as to drive the rack 81 to move away from the other rack 81. The transmission gears 82 are meshed with the racks 81, and can be arranged on the upper surface of the main smoke guide plate 81 close to the left side and the right side, and each transmission gear 82 corresponds to one rack 81, so that when the racks 81 move leftwards or rightwards, the transmission gears 82 can be driven to rotate, and the corresponding auxiliary smoke guide plate is closed.

The upper surface of the main smoke guiding plate 61 is provided with brackets 85 at positions close to the left side and the right side, respectively, and the brackets 85 are provided with transmission shafts 86, wherein the transmission shafts 86 extend in the front-rear direction and can rotate around the axes of the transmission shafts relative 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 guide plate 62 and the second auxiliary smoke guide 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 respectively connected with the transmission shaft 86 through bushings 64.

The elastic member 83 is preferably a spring in this embodiment, and the moving mechanism further includes two support seats 87, the two support seats 87 are disposed between the two pushing blocks 84, and each support seat 87 corresponds to one pushing block 84. The above-mentioned elastic member 83 is connected between each support 87 and the corresponding pusher block 84. The force exerted by the elastic member 83 on the pusher block 84 keeps it tending to move towards the seat 87, thereby keeping the corresponding auxiliary smoke guide plate open (flattened, horizontal or near horizontal). After the auxiliary smoke guide plate is closed by force, when the external force disappears (in this embodiment, the force applied to the pushing block 84 by the second slider 78 through the first sliding rod 79 and the second sliding rod 80), 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 turning of the left and right auxiliary smoke guide plates through the gear rack transmission, and the angle can be accurately controlled, and the left and right auxiliary smoke guide plates can independently move up and down when not pressed, so that the gap adjustment between the brake filter screen 4 and the fixed filter screen 5 is controlled.

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

In the practical use process, the condition of frying on one side of the kitchen range under the range hood is more, but the other side is not used or has no smoke, and the cooking state can be switched between big smoke and small smoke. The oil filtering capability and the resistance are a pair of related contradictions, and the common range hood is difficult to consider both the oil filtering capability and the resistance, but in the invention, the gap between the filter screens 5 can be adjusted and fixed according to the oil smoke condition under working conditions through the movement of the movable filter screen 4, so that the resistance and the oil filtering capability are changed, the contradiction that large oil smoke needs large air volume and oil filtering can be temporarily ignored is solved, small oil smoke needs to be mainly solved, the effect that the large oil smoke preferentially ensures oil smoke absorption is realized, and the small oil smoke preferentially ensures oil filtering is realized. The side with oil smoke is opened and the uncooked side is closed by the movement of the auxiliary smoke guide plate.

In the invention, the large oil fume and the small oil fume refer to the actual working state flow of the range hood installed at the home of a user, the flow can be defined according to the laboratory test condition, and the preferable dividing line of the flow can be 6-10 m³And/min. According to the difference between different on-hook heights and machine types, for example, the ceiling type range hood is installed according to the standard (the installation range is 650-750mm defined by the national standard), the flow limit of 700mm from the platform surface may be 9m³And when the mounting height thereof is adjusted to 750mm, the boundary thereof needs to be lifted up to 10m³The oil smoke escape is reduced.

Referring to fig. 2, a first operating state of the range hood of the present invention is suitable for a case where the cooking conditions are almost right and left and both are small 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 groove 751, the movable filter screen 4 is located at the middle position in the right and left direction, and the gap between the movable filter screen and the fixed filter screen 5 is small, at this time, oil filtration is performed preferentially, sufficient filtration is performed, and the index of oil-fat separation degree is improved; the first sliding block 77 is not in contact with the first sliding rod 79, the two auxiliary smoke baffles are in an open state (the open state means almost flush with the main smoke baffle 61), the consistency of channels on two sides is ensured, and the negative pressure is more expanded relative to the common range hood.

Referring to fig. 6 to 8, the second operating state of the range hood of the present invention is suitable for the case of large oil smoke in both left and right cooking states, at this time, the second slider 78 is located at the middle position, the slider fixing block 74 is located at the uppermost position of the second guide groove 751, the movable filter screen 4 is located at the middle position in the left and right direction, and the gap between the movable filter screen and the fixed filter screen 5 is large, at this time, air intake is prioritized, oil smoke is sufficiently discharged, and the index of clean suction is improved; the first sliding block 77 is not in contact with the first sliding rod 79, the two auxiliary smoke baffles are in an open state (the open state means almost flush with the main smoke baffle 61), the consistency of channels on two sides is ensured, and the negative pressure is more expanded relative to the common range hood.

Referring to fig. 9 to 11, a third operating state of the range hood of the present invention is suitable for a case where a difference between left and right cooking states is small and there is little oil smoke on the left side, at this time, the second slider 78 is located near the right, the slider fixing block 74 is located in the middle of the second guide groove 751, the movable filter screen 4 is located near the right, and a gap between the movable filter screen 4 and the fixed filter screen 5 is small, at this time, oil filtration is performed preferentially, and sufficient filtration is performed; the first 79 and second 80 slide bars on the right side contact and push them to slide downwards, and the auxiliary smoke barrier on the right side is in an inward folded closed 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, a fourth operating state of the range hood of the present invention is suitable for a situation where a difference between left and right cooking states is large, and the left side has large oil smoke and the right side has small oil smoke, at this time, the second driven wheel 74 is driven to a position lower than the middle of the right side of the fixed gear 71, the fixed bracket 75 extends vertically to a middle position in the left-right direction, the movable filter screen 4 is close to the right side, and a gap between the movable filter screen 4 and the fixed filter screen 5 is small, at this time, oil filtration is performed preferentially, and sufficient filtration is performed; the first sliding block 77 on the right side contacts with the first sliding rod 79 to push the sliding rod to slide downwards, and the auxiliary smoke baffle on the right side is in an inwards reversed state (preferably 60 degrees from 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, in an eighth operating state of the range hood of the present invention, on the basis of fig. 19 and 20, an opening angle of the first auxiliary smoke guide plate 62 on the left side is increased, for example, 40 ° is formed with the horizontal direction, and the left side is slightly smaller than the right side.

The range hood of the invention has the following control methods. In the first control method, the second slider 78 can be provided with a position sensor, and the position sensor is used in combination with a left oil smoke sensor and a right oil smoke sensor, the two oil smoke sensors can be respectively arranged at the bottoms of the left side and the right side of the smoke collecting hood 1, and the range hood has no power or current detection feedback. Referring to fig. 22, the method specifically includes 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 current right oil smoke concentration yb;

3) whether the oil smoke concentrations detected by the current oil smoke sensors are obviously different or not is compared, and corresponding control is performed according to the comparison result, ya represents the oil smoke concentration value on the left side, yb represents the oil smoke concentration value on the right side, the reference values are m1 and m2, m1 represents a preset difference lower limit value, m2 represents a preset difference upper limit value, the relation between the difference proportion and the gap of the oil smoke concentration values on the left side and the right side 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 under the 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 under the small oil smoke scene:

3.1) if

3.1.1) if yd is larger than y1, indicating a large oil smoke scene with large difference between the left side and the right side, then comparing ya and ub, and controlling correspondingly according to the comparison result:

3.1.1.1) if ya is more than yb, controlling the first auxiliary smoke guide plate 62 at the left side to be kept open and unfolded, positioning the movable filter screen 4 at the right channel, simultaneously closing the second auxiliary smoke guide plate 63 at the right side in a furled mode, and then entering the step 4);

3.1.1.2) if ya < yb, controlling the right second auxiliary smoke guide plate 63 to be opened and flattened, and the movable filter screen 4 to be positioned in the left channel, and simultaneously closing the left first auxiliary smoke guide plate 62 in a folding way, and then entering the step 4);

3.1.2.1) if ya is more than yb, controlling the first auxiliary smoke guide plate 62 at the left side to be kept open and unfolded, positioning the movable filter screen 4 at the right channel, simultaneously closing the second auxiliary smoke guide plate 63 at the right side in a furled mode, and then entering the step 4);

3.1.2.2) if ya < yb, controlling the right second auxiliary smoke guide plate 63 to be opened and flattened, and the movable filter screen 4 to be positioned in the left channel, and simultaneously closing the left first auxiliary smoke guide plate 62 in a folding way, and then entering the step 4);

3.2) if

The oil smoke concentration on the two sides is considered to be slightly different, and the two sides are provided with oil smokeAccording to

And

the size and relative proportion of the two auxiliary smoke guide plates determine the rotation angle 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

Then think that both sides oil smoke concentration is not different, then take ya and yb in great value record as yd, compare it with preset oil smoke concentration threshold value y1, carry out corresponding control according to the result of comparison, in this step, still control the clearance between movable filter screen 4 and the fixed filter screen 5 under the big oil smoke scene and be greater than the clearance between movable filter screen 4 and the fixed filter screen 5 under the little oil smoke scene, two supplementary smoke deflector open and be the exhibition flat:

3.3.1) if yd is larger than y1, indicating a left and right almost big oil smoke scene, controlling the movable filter screen 4 to be positioned at the middle position in the left and right direction, and then entering the step 4);

3.3.2) if yd is less than or equal to y1, representing a left-right small oil smoke scene, 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 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 the auxiliary smoke guide plates are matched with the current cooking scene or not, if so, returning to the step 2), otherwise, driving the movable filter screen 4 and the auxiliary smoke guide plates to the corresponding states by the driving mechanism 88, and after waiting for a time interval delta ta, returning to the step 4).

In the above control flow, use is made of

As a reference value for comparison, this is because the oil smoke sensing is taken into considerationThe dynamic change of the oil smoke concentration value of the device is large, the oil smoke concentration value needs to be converted into a certain characteristic range, and a preset value is conveniently set when the device leaves a factory and is well compared with the preset value. Thus, it is considered to convert it into [0,1 ]]Within the range of (3), it is convenient to set the thresholds of m1, m2, and the like. Meanwhile, the denominator adopts a value obtained by subtracting the oil smoke concentration values detected by the two sensors, and the relative difference (large difference, small difference and larger difference) can be reflected by the size of the denominator; however, when the values in two different environments or different cooking stages are compared, it may be that the two stage values cannot be compared directly by using the subtracted values of the front and rear two groups, such as the oil smoke concentration values of ya, yb, ya 'and yb', because the values in the two stages are greatly changed dynamically.

Therefore, in the present embodiment, it is considered to adopt

Namely, the comparison range can be converted into 0,1]In addition, the left and right cooking differences can be presented, and the left and right cooking differences under different times, different user environments and different fuming cooking conditions can be conveniently compared.

For example:

the unit of ya is 100, yb is 700 at time A, and may be mg/m³Or other uniform units;

the unit of ya is 1000, yb is 5000, and the unit can be mg/m at the time B³Or other uniform unit.

If the difference between the two moments before and after the direct comparison is carried out, the difference is about 1 order of magnitude between 600VS 4000, and the comparison cannot be carried out. By adopting the comparison method of the invention, the difference |100 |/|100+700| -0.75 at the time A, and the difference |1000 |/| -5000| -0.66 at the time B can be found to be convenient for comparison, and obviously, the difference between the left and the right at the time A is larger.

The second control method is different from the range hood structure used by the first control method in that the range hood has power or current detection feedback and can adjust air volume or gears. Referring to fig. 23, the method specifically includes the following steps:

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

3.1) if

3.2) if

Then the oil smoke concentration on the two sides is considered to be slightly different according to

And

3.3) if

5) judging whether the current positions of the movable filter screen 4 and the auxiliary smoke guide plates are matched with the current cooking scene or not, if so, entering the step 6), otherwise, driving the movable filter screen 4 and the auxiliary smoke guide plates to the corresponding states by the driving mechanism 88, and returning to the step 4 after waiting for a time interval delta ta);

6) acquiring current power or rotation speed and a power or rotation speed coefficient of a 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 and lower limit values of the corresponding scene, if yes, entering step 8), and if not, entering step 9);

9) judging whether Qm is larger or smaller, if larger, namely Qm is larger than Qd, entering step 10), and if smaller, namely Qm is smaller than 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 or not, and if so, entering the step 11); if not, the 1 st gear is adjusted 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 or not, 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);

13) and (4) judging whether the gap between the movable filter screen 4 and the fixed filter screen 5 is the maximum, if so, prompting to clean, otherwise, driving the movable filter screen 4 to move upwards, increasing the gap, and returning to the step 6).

The third control method is different from the range hood structure used by the second control method in that the second slider 78 does not have a position sensor, the rotation step is detected only by the driving mechanism 88, 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 used by the temperature sensor, the range hood can automatically switch the range hood state on and off, and whether the current mode is met or not is confirmed according to the feedback of the air volume calculation, so that the state is adjusted. Referring to fig. 24, the method specifically includes the following steps:

1) the range hood is in standby state, and the temperature sensor monitors operation;

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

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

4) calculating left and right temperature change slopes, wherein the left temperature change slope kL is (TL2-TL1)/Δ t and the right temperature change slope kR is (TR2-TR1)/Δ t; TL2 and TL1 are values of two groups of left side temperature sensors, wherein TL2 is time later, and TR2 and TR1 are values of two groups of right side temperature sensors, wherein TR2 is time later;

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

6) respectively comparing kL with kLa, kR and kRa, if the kL is greater than kLa and the kL is positive, starting the range hood to smoke, and entering the step 8); if | kL | is more than kLa and kL is negative, or | kL | is less than or equal to kLa, then entering step 7); if the absolute value of kR is more than kRa and kR is positive, starting the range hood to smoke and entering the step 8); if | kR | is > kRa and kR is negative, or | kR | ≦ kRa, then proceed 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 is more than ktheta, indicating that smoking on the left side is dominant, and entering the step 9); if the | kL-kR | is less than k theta, the left side and the right side are the same, and the step 9) is carried out; if kR-kL is more than ktheta, indicating that smoking on the right side is dominant, and entering step 9); k theta is a threshold value of a preset temperature change slope difference value;

9) judging whether the temperature value changes suddenly or not, if so, adjusting the movable filter screen 4 and each auxiliary smoke guide plate to operate at a large smoke position in a corresponding cooking state, controlling a channel of the movable filter screen 4 at the opposite side if the left-side or right-side oil smoke absorption is taken as a main part, closing the auxiliary smoke guide plate at the same side with the movable filter screen 4 in a furled mode (the auxiliary smoke guide plate at the other side is kept opened and is in a flattened state), and controlling the movable filter screen 4 to be located at the middle position in the left-right direction and opening both the two auxiliary smoke guide plates if the left side and the right side are the same; a fan system defaults to a large gear, and the step 10) is carried out; if not, adjusting the movable filter screen 4 and each auxiliary smoke guide plate to operate at a small oil smoke position in a corresponding cooking state, controlling a channel of the movable filter screen 4 on the opposite side if oil smoke absorption on the left side or the right side is mainly performed, closing the auxiliary smoke guide plates on the same side with the movable filter screen 4 (the auxiliary smoke guide plates on the other side are kept opened and are in a flattened state), and controlling the movable filter screen 4 to be positioned at the middle position in the left-right direction if the left side and the right side are the same, so that both the two auxiliary smoke guide plates are opened; a fan system defaults to a small gear, and the step 10) is carried out; in the step, the gap between the movable filter screen 4 and the fixed filter screen 5 in a large oil smoke scene is larger than the gap between the movable filter screen 4 and the fixed filter screen 5 in a small oil smoke scene;

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

12) acquiring current power or rotation speed and the power or rotation speed coefficient of the current position, and calculating to obtain the current flow Qm of the fan system 3 flowing through the range hood;

13) judging whether Qm is in [ Qx, Qd ] of the corresponding scene, wherein Qx and Qd are respectively the upper and lower limit values of the corresponding scene, if yes, entering step 14), and if not, entering step 15);

14) continuing monitoring, wherein the monitoring frequency s is s +1, judging whether s is greater than or equal to s1, s1 is a preset threshold value for the monitoring frequency, and if so, writing the gear and the position of the current scene into a storage updating preset value and resetting s to be 0; if not, continuing to monitor, and returning to the step 2);

15) judging whether Qm is larger or smaller, if larger, namely Qm is larger than Qd, entering step 16), and if smaller, namely, Qm is smaller than 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 or not, and if so, entering the step 17); if not, the 1 st gear is adjusted down, and the step 12) is returned;

17) judging whether the gap between the movable filter screen 4 and the fixed filter screen 5 is minimum or not, 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 the fan system 3 of the current range hood is highest, if so, entering a step 19); if not, the 1 st gear is increased, and the step 12) is returned;

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

In the fourth control method, the position of the second slider is obtained by only detecting the rotation step by the driving mechanism or calculating the rotation angle based on the product of the rotation speed and the time, and the user can select a mode or receive feedback values of other sensors. Referring to fig. 25, the method specifically includes the following steps:

2) the cooking state is obtained by user input or smoke stove electric feedback or smoke and infrared sensors and the like, and is finally reflected as the current oil smoke amount on the left side and the right side;

3) judging whether the difference of the oil smoke amount of the left side and the oil smoke amount of the right side is larger than a preset threshold value, if the oil smoke amount or the temperature is compared, judging modes can be the first control method, the second control method and the third control method, and judging methods commonly used in the field can also be adopted; if yes, indicating that the two sides have obvious difference, entering step 4), and if not, entering step 6);

4) the driving mechanism is started to control the movable filter screen 4 to be positioned at one side of the large oil smoke, the auxiliary smoke guide plate at the side is unfolded and 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 position of the movable filter screen 4 (simultaneously acquiring the positions of the auxiliary smoke guide plates) according to the rotation or angle of the driving mechanism, judging whether the moving mechanism adjusts the movable filter screen 4 and the auxiliary smoke guide plates in place, returning to the step 2 if the position is in place, and repeating the step if the position is not in place;

6) reading the position of the current movable filter screen 4 (simultaneously acquiring the positions of the auxiliary smoke guide plates) according to the rotation steps or angles of the driving mechanism;

7) judging whether the current positions of the movable filter screen 4 and the auxiliary smoke guide plates are in accordance with the cooking state, if so, returning to the step 2), and if not, driving the movable filter screen 4 and the auxiliary smoke guide plates to move to corresponding positions;

8) waiting for the time interval delta t, reading the position of the movable filter screen 4 again (simultaneously acquiring the positions of the auxiliary smoke guide plates), judging whether the moving mechanism adjusts the movable filter screen 4 and the auxiliary smoke guide plates in place, if so, returning to the step 2), and if not, repeating the step.

Claims

1. A range hood comprises a smoke collecting hood (1), a fan frame (2) arranged above the smoke collecting hood (1) and a fan system (3) arranged in the fan frame (2), wherein an air inlet (11) is formed in the smoke collecting hood (1), a fixed filter screen (5) is arranged at the position of the air inlet (11), a smoke guide plate assembly is arranged below the fixed filter screen (5), and the smoke guide plate assembly comprises a main smoke guide plate (61) positioned in the middle; 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) extends transversely, and the movable filter screen (4) can move up and down and left and right, so that the air inlet states of a left channel and a right channel below the fan system (3) in the fan frame (2) and the gaps between the movable filter screen (4) and the fixed filter screen (5) are changed;

the cigarette guide plate assembly further comprises a first auxiliary cigarette guide plate (62) located on the left side of the main cigarette guide plate (61) and a second auxiliary cigarette guide plate (63) located on the right side of the main cigarette guide plate (61), and the first auxiliary cigarette guide plate (62) and the second auxiliary cigarette guide plate (63) can rotate around the axis extending in the front-back direction.

2. The range hood of claim 1, wherein: the inside motion that can drive and move filter screen (4) that still is provided with of fan frame (2), motion includes output gear (72), slider fixed block (74), fixed bolster (75) and first slider (77), fixed bolster (75) set up the inboard at fan frame (2) fixedly, first slider (77) and fixed bolster (75) sliding fit and can reciprocate along fixed bolster (75), first slider (77) rotate with output gear (72) and be connected, the axis of rotation of output gear (72) extends along the fore-and-aft direction, slider fixed block (74) rotate with the off-centre position of output gear (72) and are connected to can be driven by output gear (74) and move about and from top to bottom, slider fixed block (74) still are used for being connected fixedly with moving filter screen (4).

3. The range hood of claim 2, wherein: the motion mechanism further comprises a driving wheel (71), a gear limiting frame (73) and a driving mechanism (88) used for driving the driving wheel (71) to rotate along the axis extending back and forth, 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 rotationally connected with the center of the output gear (72).

4. A range hood according to claim 2 or 3, wherein: the moving 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.

5. The range hood of claim 4, wherein: the movement mechanism further comprises a first sliding rod (79), a second sliding rod (80) and pushing blocks (84), the first sliding rod (79) is provided with two sliding rods and is fixedly arranged at the left side and the right side of the second sliding block (78) respectively, the second sliding rod (80) is provided with two sliding rods and is arranged at the left side and the right side in the fan frame (2) respectively, the second sliding rods (80) extend longitudinally and extend downwards below 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), when the first sliding rod (79) moves towards a direction far away from the other first sliding rod (79), the second sliding rod (80) can be pushed to move downwards, when the second sliding rod (80) moves downwards, the pushing blocks (84) can be pushed towards a direction far away from the other pushing block (84), and accordingly the corresponding auxiliary smoke guide plate is driven to rotate, each auxiliary smoke guide plate is opened to be flattened.

6. The range hood of claim 5, wherein: the first sliding rod (79) is bent, one part of the first sliding rod (79) extends along the left-right direction, the other part of the first sliding rod (79) extends along the front-back direction after being bent, the bottom surface of the part, extending back and forth, of the first sliding rod (79) is inclined and gradually inclines upwards from one side close to one side away from the other side, the upper end of the second sliding rod (80) can be matched with the part, extending back and forth, of the first sliding rod (79) at the corresponding position, and therefore the first sliding rod (79) can push the second sliding rod (80) to move downwards.

7. The range hood of claim 5, wherein: the lower end face of the second sliding rod (80) is gradually inclined upwards from one end close to each other to one end far away from each other, and the upper end face of the pushing block (84) is gradually inclined upwards from one end close to each other to one end far away from each other, so that the second sliding rod (80) can push the pushing block (84) to move.

8. The range hood of claim 5, wherein: the movement mechanism further comprises a rack (81) arranged on the upper surface of the main cigarette guiding plate (61), a transmission gear (82) meshed with the rack (81) and a transmission shaft (86) rotatably connected with the main cigarette guiding plate (61), the transmission shaft (86) can rotate around an axis extending back and forth, the rack (81) extends in the left-right direction, each auxiliary cigarette guiding plate corresponds to one rack (81) and the transmission shaft (86), the pushing blocks (84) are arranged at the end parts of the racks (81) close to each other, the pushing blocks (84) and the racks (81) move synchronously, and the transmission gear (82) is wound on the transmission shaft (86) and can rotate synchronously; each auxiliary smoke guide plate is fixedly connected with a transmission shaft (86) on the corresponding side and can synchronously rotate.

9. The range hood of claim 5, wherein: the movement mechanism further comprises a support (87) and an elastic member (83), the support (87) is provided with two supports and is arranged between the two pushing blocks (84), each support (87) corresponds to one pushing block (84), the elastic member (83) is connected between each support (87) and the corresponding pushing block (84), and the elastic member (83) applies force to the pushing blocks (84) to keep the pushing blocks (84) in a trend of moving towards the supports (87), so that the corresponding auxiliary smoke guide plates are kept in a flattening trend.

10. A control method of a range hood as claimed in any one of claims 1 to 9, wherein: 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, comparing ya and yb, and controlling the gap between the movable filter screen (4) and the fixed filter screen (5) under the large oil smoke scene to be larger than the gap between the movable filter screen (4) and the fixed filter screen (5) under the small oil smoke scene according to the comparison result:

3.1.1.1) if ya is more than yb, controlling the first auxiliary smoke guide plate (62) at the left side to be kept open and flattened, positioning the movable filter screen (4) in a right channel, simultaneously closing the second auxiliary smoke guide plate (63) at the right side in a furled mode, and then entering the step 4);

3.1.1.2) if ya is less than yb, controlling the second auxiliary smoke guide plate (63) on the right side to be kept open and flattened, and positioning the movable filter screen (4) in the left channel, and simultaneously closing the first auxiliary smoke guide plate (62) on the left side in a furled mode, and then entering the step 4);

3.1.2.1) if ya is more than yb, controlling the first auxiliary smoke guide plate (62) at the left side to be kept open and flattened, positioning the movable filter screen (4) in a right channel, simultaneously closing the second auxiliary smoke guide plate (63) at the right side in a furled mode, and then entering the step 4);

3.1.2.2) if ya is less than yb, controlling the first auxiliary smoke guide plate (62) at the left side to be kept open and flattened, positioning the movable filter screen (4) in the right channel, simultaneously closing the second auxiliary smoke guide plate (63) at the right side in a furled mode, and then entering the step 4);

3.3) if the difference between ya and yb is less than m1, then the oil smoke concentrations on two sides are considered to be not different, then the larger value in ya and yb is taken to be recorded as yd, yd is compared with a preset oil smoke concentration threshold value y1, corresponding control is performed according to the comparison result, in the step, the gap between the movable filter screen (4) and the fixed filter screen (5) in the 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 the small oil smoke scene, and the two auxiliary smoke guide plates are opened to be flattened:

3.3.1) if yd is larger than y1, indicating a left and right almost big oil smoke scene, controlling the movable filter screen (4) to be positioned at the middle position in the left and right direction, and then entering the step 4);

3.3.2) if yd is less than or equal to y1, representing a left-right small oil smoke scene, 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) acquiring current position information of the movable filter screen (4) and each auxiliary smoke guide plate;

5) and 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, returning to the step 2), otherwise, driving the movable filter screen (4) and each auxiliary smoke guide plate to be in a corresponding state, and after waiting for a time interval delta ta, returning to the step 4).

11. The control method of the range hood according to claim 10, characterized in that: in step 3), if

Judging that the difference between ya and yb exceeds m 2; if it is not

Then ya and yb are considered to differ less than m 1.

12. A control method of a range hood as claimed in any one of claims 1 to 9, wherein: the method comprises the following steps:

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

3.1) if

5) judging whether the current positions of the movable filter screen (4) and the auxiliary smoke guide plates are matched with the current cooking scene or not, if so, entering a step 6), otherwise, driving the movable filter screen (4) and the auxiliary smoke guide plates to be in corresponding states, 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);

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 or not, and if so, entering the step 11); if not, the 1 st gear is adjusted 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 or not, 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 step 13); if not, the 1 st gear is increased, and the step 6) is returned;

13) and (3) judging whether the gap between the movable filter screen (4) and the fixed filter screen (5) is the maximum, if so, prompting to clean, if not, driving the movable filter screen (4) to move upwards, increasing the gap, and returning to the step 6).

13. The control method of the range hood according to claim 12, wherein: in step 3), if

Judging that the difference between ya and yb exceeds m 2; if it is not

Then ya and yb are considered to differ less than m 1.

14. A control method of a range hood as claimed in any one of claims 1 to 9, wherein: the method comprises the following steps:

1) standby of the range hood;

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

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

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

15) if Qm > Qd, go to step 16), if Qm < Qx, go to step 18);

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

17) judging whether the gap between the movable filter screen (4) and the fixed filter screen (5) is minimum or not, 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 increased, and the step 12) is returned;

19) and (3) judging whether the gap between the movable filter screen (4) and the fixed filter screen (5) is the maximum or not, if so, prompting to clean, otherwise, driving the movable filter screen (4) to move upwards, increasing the gap, and returning to the step 12).

15. The control method of the range hood according to claim 14, wherein: in the step 9), if the large oil smoke scene is adopted, when the left side or the right side oil smoke absorption is taken as the main part, the movable filter screen (4) is controlled to be positioned in a channel on the opposite side of the large oil smoke, the auxiliary smoke guide plate on the same side with the movable filter screen (4) is closed, and the auxiliary smoke guide plate on the other side is kept opened and is in a flattening 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 scene is a small oil smoke scene, when oil smoke is mainly absorbed on the left side or the right side, the movable filter screen (4) is controlled to be positioned in a channel on the opposite side of the small oil smoke, and the auxiliary smoke guide plate on the same side with the movable filter screen (4) is closed in a furled mode; 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 and 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.

16. A control method of a range hood as claimed in any one of claims 1 to 9, wherein: the method comprises the following steps:

2) acquiring the current oil smoke amount of the left side and the right side;

4) the movable filter screen (4) is controlled 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;

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 the 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 (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 so, returning to the step 2), and if not, driving the movable filter screen (4) and each auxiliary smoke guide plate to operate to the corresponding position;

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