CN216079971U

CN216079971U - Fume exhaust fan

Info

Publication number: CN216079971U
Application number: CN202122073194.6U
Authority: CN
Inventors: 何立博
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-03-18
Anticipated expiration: 2031-08-31

Abstract

The utility model discloses a range hood, which 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, and a fixed filter screen is arranged at the air inlet, and the range hood is characterized in that: the below that is located fan system in the fan frame is provided with moves the filter screen, it transversely extends to move the filter screen, move the filter screen and can move from top to bottom and from side to change the air inlet state of the left and right sides in the fan frame and move the clearance between filter screen and the fixed filter screen. Compared with the prior art, the utility model has the advantages that: through setting up both can adjust the double-deck filter screen clearance, also can adjust the filter screen that moves of left and right sides air inlet state, and then adjust resistance and oil strain ability, adapt to the multi-scene operating mode of different cooks.

Description

Fume exhaust fan

Technical Field

The utility model relates to an oil fume purification device, in particular to a 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.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is to provide the range hood aiming at the defects in the prior art, which can realize the matching of the air inlet area and the distribution of resistance to the cooking condition and improve the oil smoke absorption effect.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a range hood, includes collection petticoat pipe, sets up in the fan frame of collection petticoat pipe top and sets up the fan system in the fan frame, the air intake has been seted up on the collection petticoat pipe, air intake department is provided with fixed filter screen, its characterized in that: the below that is located fan system in the fan frame is provided with moves the filter screen, it transversely extends to move the filter screen, move the filter screen and can move from top to bottom and from side to change the air inlet state of the left and right sides in the fan frame and move the clearance between filter screen and the fixed filter screen.

Preferably, for the movement track of injecing the movable filter screen, range hood still includes the motion that is used for driving the movable filter screen motion, motion includes the base of fixing in the fan frame, can set up the slider portal on the base and can be along the slider portal horizontal slip's slider from top to bottom with sliding, the slider is connected fixedly with the movable filter screen.

Preferably, for the slider and the slider portal sliding fit, the slider portal is provided with a sliding groove, the sliding groove extends in the left-right direction, and the slider can slide along the sliding groove.

In order to facilitate the mechanism to simultaneously realize the up-down and left-right movement of the movable filter screen, the movement mechanism further comprises a chain moving along the ring shape, the sliding block is rotationally connected with one section of the chain, and the rotating shaft of the sliding block extends in the front-back direction, so that the sliding block can move up and down and left and right simultaneously along with the movement of the chain.

Preferably, the ring shape is rectangular.

In order to facilitate the movement of the driving chain, the movement mechanism further comprises a driving wheel and three driven wheels, the driving wheel is rotatably arranged on the base through a driving shaft, the driven wheels are rotatably arranged on the base through driven shafts, the driving shaft and the driven shafts extend in the front-rear direction, the driving shaft and the three driven shafts form four corners of a rectangle, and the chain is wound on the driving wheel and the driven wheels and can be driven by the driving wheel to move.

In order to drive the driving wheel to rotate, the movement mechanism further comprises a driving mechanism, and the driving mechanism is used for driving the driving shaft to rotate around the axis of the driving shaft.

Compared with the prior art, the utility model has the advantages that: the movable filter screens 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 are arranged, so that the resistance and the oil filtering capability are adjusted, and the multi-scene working conditions of different cookings are adapted; the driving wheel drives the chain of the annular moving path, and a set of mechanism realizes the up-down and left-right movement of the movable filter screen; the position of the movable filter screen is adjusted in a direction unchanged mode by utilizing the chain rotating shaft and the sliding block.

Drawings

FIG. 1 is a schematic view of a range hood according to an embodiment of the present invention;

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 a dynamic filter screen and a movement mechanism thereof of the range hood of FIG. 2;

FIG. 4 is an exploded view of FIG. 3;

fig. 5 is a sectional view of the range hood in the second state according to the embodiment of the present invention;

fig. 6 is a sectional view of the range hood according to the embodiment of the present invention in a third state;

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

fig. 8 is a sectional view of the range hood according to the embodiment of the present invention in a fifth state;

fig. 9 is a sectional view of a range hood according to an embodiment of the present invention in a sixth state;

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

fig. 11 is a sectional view of the range hood according to the embodiment of the present invention in an eighth state;

fig. 12 is a first control flowchart of the range hood according to the embodiment of the present invention;

fig. 13 is a second control flowchart of the range hood according to the embodiment of the present invention;

fig. 14 is a third control flowchart of the range hood according to the embodiment of the present invention;

fig. 15 is a fourth control flowchart 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 4, a range hood is a ceiling range hood, and 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.

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. The smoke guide plate 6 is arranged below the fixed filter screen 5, and as in the prior art, oil smoke enters the fan frame 2 through the air inlet 11 from a channel between the periphery of the smoke guide plate 6 and the smoke collection cover 1.

The moving screen 4 is a plate with mesh holes, able to vary the resistance, movable inside the fan frame 2, preferably in the form of a flat plate. For this purpose, a movement mechanism for driving the movable filter screen 4 to move is further arranged inside the fan frame 2, and comprises a driving wheel 71, a driven wheel 72, a chain 73, a slide block 74, a slide block door frame 75, a driving mechanism 76 and a base 77. Wherein, base 77 can be fixed in the rear side in fan frame 2, and drive wheel 71 and driven wheel 72 all are connected with base 77 rotation. The capstan 71 is rotatably connected to the base 77 via a drive shaft 711, the capstan 71 is fixedly connected to the drive shaft 711, and the drive mechanism 76 is a rotary drive mechanism, such as a motor, having an output end directly or indirectly connected to the drive shaft 711, for driving the drive shaft 711 to rotate about its axis, so as to drive the capstan 71 to rotate relative to the base 77. Driven wheel 72 is rotatably connected to base 77 via driven shaft 721, driven wheel 72 is fixedly connected to driven shaft 721, and driven shaft 721 is rotatable about its axis. The drive shaft 711 and the driven shaft 721 described above each extend in the front-rear direction.

In the present embodiment, the driving pulley 71 has one, and the driven pulley 72 has three, and the driving shaft 711 and the three driven shafts 721 constitute four corners of a rectangle. The driving pulley 71 and the driven pulley 72 are both chain wheels, and the chain 73 is in a closed ring shape and is wound on the driving pulley 71 and the driven pulley 72.

The slide door frame 75 is provided on the base 77 to be slidable up and down, and has a slide groove 751 formed thereon, the slide groove 751 extends in the left-right direction, and the slide 74 is slidably engaged with the slide door frame 75 to be slidable left and right along the slide groove 751. The movable filter screen 4 is fixedly connected with a sliding block 74, and the sliding block 74 is also rotatably connected with one section of the chain 73.

When the driving mechanism 76 is started, the driving wheel 71 can be driven to rotate, so that the chain 73 is driven to move, the sliding block 74 (including the movable filter screen 4 fixed on the sliding block) is driven to move up and down, left and right, and the left and right cooking state difference of the position adaptation of the filter screen assembly (the movable filter screen 4 and the fixed filter screen 5) can be realized.

The movable filter screen 4 moves up and down along with the sliding block 74, and can only move up and down to adjust the gap between the movable filter screen 4 and the fixed filter screen 5 to adapt to the change of the left and right cooking air inlet proportion. The dynamic screen 4 is maintained in a laterally extended state, such as a horizontal or near horizontal state, during the movement.

In this embodiment, the up-down movement and the left-right movement of the movable filter screen 4 are realized by one driving mechanism 76 in combination with a wheel disc, a chain and the like, alternatively, the movable filter screen 4 may also be independently driven by two sets of driving mechanisms 76 to move up-down and left-right, and at this time, the driving mechanism 76 is correspondingly selected from a linear driving mechanism or a rotary driving mechanism for adaptation.

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 two are difficult to be considered on the common range hood, but in the utility model, the gap between the movable filter screen 4 and the fixed filter screen 5 can be adjusted according to the oil smoke condition of the working condition, 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 oil smoke is preferentially ensured to be absorbed, and the oil filtering is preferentially ensured to be carried out by small oil smoke.

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, in a first operating state of the range hood of the present invention, when the concentration difference between the left and right oil fumes is large, and the left oil fume is mainly used as the left oil fume, and the overall oil fume is in a large cooking state, the movable filter screen 4 moves to the rightmost side, increasing the right resistance, so that the main flow is on the left side, the gap between the movable filter screen 4 and the fixed filter screen 5 is large, and oil fume absorption is preferred.

Referring to fig. 5, in a second operating state of the range hood of the present invention, when the cooking state is that the oil smoke concentration difference between the left side and the right side is large, the left side oil smoke is mainly used, and the oil smoke in the whole oil smoke is small, the movable filter screen 4 moves to the rightmost side, the resistance of the right side is increased, so that the main flow is on the left side, the gap between the movable filter screen 4 and the fixed filter screen 5 is small, and oil filtration is preferred.

Referring to fig. 6, in a third operating state of the range hood of the present invention, when the concentration difference between the left and right oil fumes is large, and the left oil fume is mainly used as the left oil fume, and the whole oil fume is in a large cooking state, the movable filter screen 4 moves to the rightmost side, the right resistance is increased, so that the main flow is on the left side, the gap between the movable filter screen 4 and the fixed filter screen 5 is large, and oil fume absorption is preferred.

Referring to fig. 7, in a fourth operating state of the range hood of the present invention, when the concentration difference between the left and right oil fumes is not particularly large, and the left oil fume is mainly used, and the right side has partial oil fume, and the whole oil fume is in a large cooking state, the movable filter screen 4 moves to the right side to increase the right side resistance, so that the main flow is on the left side, the gap between the movable filter screen 4 and the fixed filter screen 5 is large, and oil fume absorption is preferred.

Referring to fig. 8, in a fifth operating state of the range hood of the present invention, when the cooking state has a small difference between the concentrations of the oil smoke on the left and right sides and a large amount of oil smoke, the movable filter screen 4 moves to the middle, the resistances on the left and right sides are similar, so that the main flow is uniformly distributed on the left and right sides, the gap between the movable filter screen 4 and the fixed filter screen 5 is large, and oil smoke absorption is preferred.

Referring to fig. 9, in a sixth operating state of the range hood of the present invention, when the concentration difference between the left and right oil fumes is not particularly large, and the cooking state is mainly the right oil fume, and the left side has partial oil fume, and the whole oil fume is large, the movable filter screen 4 moves to the left side, and the resistance of the left side is increased, so that the main flow rate is on the right side, the gap between the movable filter screen 4 and the fixed filter screen 5 is large, and the oil fume absorption is preferential, which is opposite to the correspondence of fig. 7.

Referring to fig. 10, in a seventh operating state of the range hood of the present invention, when the cooking state is that the oil smoke concentration difference between the left side and the right side is large, mainly the oil smoke on the right side, and the oil smoke on the whole is equally large, the movable filter screen 4 moves to the leftmost side, the resistance on the left side is increased, so that the main flow is on the right side, the gap between the movable filter screen 4 and the fixed filter screen 5 is large, and the oil smoke absorption is preferential, which is opposite to the correspondence of fig. 2.

Referring to fig. 11, in an eighth operating state of the range hood of the present invention, when the cooking state is that the difference between the concentrations of the oil smoke on the left and right sides is small and the whole oil smoke is small, the movable filter screen 4 moves to the middle, the resistances on the left and right sides are similar, so that the main flow is uniformly distributed on the left and right sides, the gap between the movable filter screen 4 and the fixed filter screen 5 is small, and oil filtration is preferred.

Therefore, the movable filter screen 4 can move between the left side and the right side in the fan frame 2, so that air enters from the left side, the right side or both sides, and the air inlet resistance of the left side and the right side is changed; further, the resistance and the oil filtering capability are changed by moving up and down to change the gap with the fixed screen 5.

The range hood of the utility model has the following control methods. In the first control method, a position sensor can be arranged on the movable filter screen 4, the position sensor is used in combination with a left oil smoke sensor and a right oil smoke sensor, the range hood has no power or current detection feedback, and the two oil smoke sensors can be respectively arranged at the bottoms of the left side and the right side of the smoke collection cover 1. Referring to fig. 12, the method specifically includes the following steps:

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

2) reading information of the oil smoke sensors, including information of a left oil smoke sensor a and information of a right oil smoke sensor b;

3) comparing whether the oil smoke concentration detected by the current oil smoke sensor is obviously different, and correspondingly controlling according to the comparison result, wherein m1 and m2 respectively represent preset difference threshold values, ya represents the oil smoke concentration value on the left side, and yb represents the oil smoke concentration value on the right side:

3.1) if

The oil smoke concentration on the two sides is considered to be slightly different, and the left side and the right side are based on

And

determining the position of the movable filter screen 4 by looking up a table of the size and relative proportion of the movable filter screen, and entering step 5) if the reference is that the large side is fully opened;

3.2) if

If the oil smoke concentrations on the two sides are not different, the larger value of ya and yb is taken as yd, the yd is compared with a preset oil smoke concentration threshold value y1, if yd is not more than y1, the left side and the right side are regarded as small smoke scenes, and if yd is more than y1, the left side and the right side are regarded as large smoke scenes, and the step 5 is carried out);

3.3) if

Considering that the oil smoke concentrations on the left side and the right side are greatly different, comparing the magnitudes of ya and yb, and controlling according to the comparison result:

3.3.1) if ya > yb, the channel on the left side is opened, the movable filter screen 4 moves to the right side, and the step 4) is carried out;

3.3.2) if ya is less than yb, the channel on the right side is opened, the movable filter screen 4 moves to the left side, and the step 4) is carried out;

4) taking a larger value of ya and yb, recording as yd, comparing with a set oil smoke concentration threshold value y1, or inquiring built-in storage, judging whether the scene is a big smoke scene, a middle smoke scene or a small smoke scene, and then entering step 5);

5) acquiring current position information of the movable filter screen 4 through a position sensor;

6) judging whether the position is matched with the current cooking scene, if so, returning to the step 2), otherwise, driving the movable filter screen 4 to a corresponding state by the driving mechanism 75, and after waiting for the time interval delta ta, returning to the step 5).

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. 13, the method specifically includes the following steps:

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

3.1) if

And

3.2) if

Considering that the oil smoke concentrations on the two sides are not different, taking the larger value of ya and yb as yd, comparing the yd with a preset oil smoke concentration threshold value y1, if yd is less than or equal to y1, considering that the left side and the right side are almost small smoke scenes, and if yd is more than y1, considering that the left side and the right side are almost large smoke scenes,entering step 5);

3.3) if

6) judging whether the position is matched with the current cooking scene, if so, entering the step 7), if not, driving the movable filter screen 4 to a corresponding state by the driving mechanism 75, and returning to the step 5 after waiting for a time interval delta ta;

7) acquiring current position information of the movable filter screen 4 through a position sensor;

8) judging whether the position is matched with the current cooking scene, if so, entering the step 9), if not, driving the movable filter screen 4 to a corresponding state by the driving mechanism 75, and returning to the step 7 after waiting for a time interval delta ta;

9) 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;

10) 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 11), and if not, entering step 12);

11) 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);

12) judging whether Qm is larger or smaller, if larger, namely Qm is larger than Qd, entering step 13), and if smaller, namely, Qm is smaller than Qx, entering step 13);

13) judging whether the gear or the rotating speed of a fan system of the current range hood is the lowest, and if so, entering step 14); if not, the 1 st gear is adjusted down, and the step 9) is returned;

14) judging whether the gap between the current movable filter screen 4 and the fixed filter screen 5 is minimum or not, and if so, prompting maintenance; if not, lowering the movable filter screen 4, reducing the air inlet channel, and returning to the step 9);

15) judging whether the gear or the rotating speed of a fan system of the current range hood is highest, and if so, entering step 16); if not, the 1 st gear is increased, and the step 9) is returned;

16) and (4) judging whether the gap between the current movable filter screen 4 and the fixed filter screen 5 is the maximum, if so, prompting to clean, otherwise, lifting the movable filter screen 4, enlarging the air inlet channel, and returning to the step 9).

The third control method is different from the range hood structure used in the second control method in that the range hood is only used for detecting the rotation step by the driving mechanism 75, or the rotation angle is judged based on the rotation speed and the time product, the range hood is provided with a temperature sensor for use, the range hood can automatically switch the range hood on and off to take the range hood, 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. 14, 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 similar, 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, if so, adjusting to the position of the big smoke in each state to operate, defaulting the big gear of the fan system, and entering the step 10); if not, adjusting to the small smoke position in each state to operate, defaulting the small gear of the fan system, and entering the step 10);

10) obtaining the current position information of the movable filter screen 4 through the rotation step or angle of the motor;

11) judging whether the position matches the current cooking scene, if yes, entering step 12), if not, driving the smoke guide plate 41 to the corresponding state by the driving mechanism 75, and returning to step 10 after waiting for the 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 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 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 contact ratio of the current movable filter screen 4 and the fixed filter screen 5 is the maximum, if so, prompting maintenance; if not, lowering the movable filter screen 4, reducing the air inlet channel, 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 judging whether the contact ratio of the current movable filter screen 4 and the fixed filter screen 5 is minimum, if so, prompting to clean, otherwise, lifting the filter screen 4, enlarging the air inlet channel, and returning to the step 12).

The fourth control method, which only detects the rotation step by the driving mechanism or calculates the rotation angle based on the product of the rotation speed and the time, can accept the user selection mode or other sensor feedback values. Referring to fig. 15, the method specifically includes 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) the cooking state is acquired by user input or smoke stove electric feedback or smoke and infrared sensors and the like;

3) judging whether the left side and the right side have obvious difference, if yes, entering the step 4), and if not, entering the step 6);

4) the driving mechanism 75 drives the movable filter screen 4 to rotate to the small oil smoke side, and then the size of the gap between the movable filter screen 4 and the fixed filter screen 5 is determined by looking up a table according to the ratio of the large oil smoke value to the set oil smoke concentration threshold value;

5) waiting for the time interval delta t, reading the position of the driving mechanism 75 or the movable filter screen 4 again, judging whether the moving mechanism adjusts the movable filter screen 4 to be in place, if so, returning to the step 2), and if not, repeating the step;

6) reading the position of the current movable filter screen 4 according to the rotation step or the angle of the driving mechanism 75;

7) judging whether the position of the current movable filter screen 4 accords with the cooking state, if so, returning to the step 2), and if not, operating the driving mechanism 75 to the corresponding state;

8) waiting for the time interval delta t, reading the position of the driving mechanism 75 or the movable filter screen 4 again, judging whether the moving mechanism adjusts the movable filter screen 4 to be in place, 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) in collection petticoat pipe (1) top, air intake (11) have been seted up on collection petticoat pipe (1), air intake (11) department is provided with fixed filter screen (5), its characterized in that: the utility model discloses a fan system, including fan frame (2), the below that is located fan system (3) in fan frame (2) is provided with moves filter screen (4), move filter screen (4) and transversely extend, move filter screen (4) and remove about and from top to bottom to change the air inlet state of the left and right sides in fan frame (2) and move the clearance between filter screen (4) and fixed filter screen (5).

2. The range hood of claim 1, wherein: the range hood is characterized by further comprising a moving mechanism for driving the movable filter screen (4) to move, wherein the moving mechanism comprises a base (77) fixed in the fan frame (2), a sliding block door frame (75) capable of being arranged on the base (77) in a vertically sliding mode, and a sliding block (74) capable of sliding left and right along the sliding block door frame (75), and the sliding block (74) is fixedly connected with the movable filter screen (4).

3. The range hood of claim 2, wherein: a sliding groove (751) is formed in the sliding block door frame (75), the sliding groove (751) extends in the left-right direction, and the sliding block (74) can slide along the sliding groove (751).

4. The range hood of claim 2, wherein: the movement mechanism further comprises a chain (73) moving along the ring shape, the sliding block (74) is rotatably connected with one section of the chain (73), and a rotating shaft of the sliding block (74) extends in the front-rear direction, so that the sliding block (74) can move up and down and left and right simultaneously along with the movement of the chain (73).

5. The range hood of claim 4, wherein: the ring shape is rectangular.

6. The range hood of claim 5, wherein: the movement mechanism further comprises a driving wheel (71) and three driven wheels (72), the driving wheel (71) is rotatably arranged on the base (77) through a driving shaft (711), the driven wheels (72) are rotatably arranged on the base (77) through driven shafts (721), the driving shaft (711) and the driven shafts (721) both extend in the front-rear direction, the driving shaft (711) and the three driven shafts (721) form four corners of a rectangle, and the chain (73) is wound on the driving wheel (71) and the driven wheels (72) and can be driven by the driving wheel (71) to move.

7. The range hood of claim 6, wherein: the movement mechanism further comprises a driving mechanism (76), and the driving mechanism (76) is used for driving the driving shaft (711) to rotate around the axis of the driving shaft.