CN113639294A - Range hood and control method thereof - Google Patents
Range hood and control method thereof Download PDFInfo
- Publication number
- CN113639294A CN113639294A CN202111008843.2A CN202111008843A CN113639294A CN 113639294 A CN113639294 A CN 113639294A CN 202111008843 A CN202111008843 A CN 202111008843A CN 113639294 A CN113639294 A CN 113639294A
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- Prior art keywords
- screen plate
- range hood
- oil smoke
- gear
- movable screen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2078—Removing cooking fumes movable
- F24C15/2092—Removing cooking fumes movable extendable or pivotable
Abstract
The invention discloses a range hood and a control method thereof, 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, and a fixed filter screen is arranged at the air inlet, and the range hood is characterized in that: the range hood further comprises a moving mechanism for driving the moving screen plate to move, the moving mechanism comprises a moving mechanism comprising a linear-rotary motion conversion mechanism, the linear-rotary motion conversion mechanism comprises a first conversion part and a second conversion part, the moving screen plate is connected and fixed with the first conversion part and can synchronously move in the up-and-down direction, and when the first conversion part and the second conversion part are matched, the first conversion part rotates around an axis extending from front to back and drives the moving screen plate to rotate, so that the screen portion and the plate portion of the moving screen plate can switch positions on the left side and the right side in the fan frame, and gaps between the moving screen plate and the fixed filter screen can be adjusted.
Description
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: 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: a movable screen plate is arranged in the fan frame below the fan system, the movable screen plate comprises a net part and a plate part which are arranged along the length direction, the range hood also comprises a motion mechanism for driving the moving screen plate to move, the motion mechanism comprises a linear-rotary motion conversion mechanism, the linear-to-rotary motion converting mechanism includes a first converting member and a second converting member, the movable net plate is connected and fixed with the first conversion component and can synchronously move in the vertical direction, the first conversion component and the second conversion component can be selectively matched, when the first conversion component is matched with the second conversion component, the first conversion component rotates around the axis extending back and forth and drives the movable screen plate to rotate, thereby make the net part and the board of moving the otter board can be in the left and right sides switching position of fan frame, can also adjust the clearance between moving otter board and the fixed filter screen.
In order to be convenient for arranging a gear which can rotate and move up and down, the motion mechanism further comprises a lifting block and a connecting rod, the lifting block can move in the up-down direction, the connecting rod extends forwards and backwards to pass through the lifting block and can rotate relative to the lifting block, and two ends of the connecting rod, which penetrate out of the lifting block, are respectively connected and fixed with the movable screen plate and the first conversion part.
In order to stably drive the lifting block to lift, the movement mechanism further comprises a support fixedly arranged on the inner side of the fan frame and a driving mechanism, a sliding groove extending up and down is formed in the support, and the lifting block is in sliding fit with the support so as to be driven by the driving mechanism to move up and down along the sliding groove.
In order to facilitate the first conversion part and the second conversion part to be selectively matched, the first conversion part is a gear, the second conversion part is a rack, the motion mechanism further comprises a shifting rod, the shifting rod comprises a rod body arranged in the lifting block, a shifting part which penetrates out of the lifting block and is used for shifting the lifting block forwards and backwards and a clamping part which penetrates out of the lifting block, the gear is clamped between the clamping parts, the gear can rotate relative to the clamping part and can move forwards and backwards along with the clamping part, and the rack is fixedly arranged on the support, so that the gear is meshed with or separated from the rack when moving forwards and backwards.
For the convenience of automatically shifting the shifting lever, the upper end and the lower end of the support are respectively provided with a gear shifting auxiliary fork, the downward end opening of the gear shifting auxiliary fork above the support forms a first guide groove which is sunken from bottom to top, the front end of the first guide groove is gradually inclined backward from bottom to top, the upward end opening of the gear shifting auxiliary fork below the support forms a second guide groove which is sunken from top to bottom, the rear end of the second guide groove is gradually inclined forward from top to bottom, the rack is located between the two gear shifting auxiliary forks in the up-down direction, and the length of the rack in the up-down direction is smaller than that of the part, between the two gear shifting auxiliary forks, of the sliding groove on the support.
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, and controlling according to the comparison result:
3.1) if the difference between ya and yb exceeds a threshold, comparing ya and yb, and controlling accordingly according to the comparison result:
3.1.1) if ya > yb, controlling the net part of the movable screen plate to be positioned in a left channel in the fan frame, the plate part to be positioned in a right channel in the fan frame to close the right channel, the left channel to work unilaterally, and the movable screen plateAnd the gap between the fixed filter screen
And determining, and then entering step 4); y1 is a preset oil smoke concentration threshold;
3.1.2) if ya < yb, controlling the net part of the movable screen plate to be positioned in the right channel in the fan frame, the plate part to be positioned in the left channel in the fan frame to close the left channel, the right channel to work unilaterally, and the gap between the movable screen plate and the fixed filter screen according to
And determining, and then entering step 4); y1 is a preset oil smoke concentration threshold;
3.2) if ya and yb are not different, controlling the movable screen plate to be positioned at the middle position in the left-right direction in the fan frame and to be in a vertical or nearly vertical state, and then entering the step 4);
4) acquiring current position information of a moving screen plate;
5) and judging whether the position is matched with the current cooking scene, if so, returning to the step 2), otherwise, driving the moving screen plate (4) to the corresponding position, 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 the threshold value, if
Ya and yb are considered to be no difference, where m1 represents a preset difference threshold.
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;
2) acquiring the current left oil smoke concentration ya and the current right oil smoke concentration yb;
3) comparing ya and yb, and controlling according to the comparison result:
3.1) if the difference between ya and yb exceeds a threshold, comparing ya and yb, and controlling accordingly according to the comparison result:
3.1.1) if ya > yb, controlling the net part of the movable screen plate to be positioned in the left channel in the fan frame, the plate part to be positioned in the right channel in the fan frame to close the right channel, the left channel to work unilaterally, and the gap between the movable screen plate and the fixed filter screen according to
And determining, and then entering step 4); y1 is a preset oil smoke concentration threshold;
3.1.2) if ya < yb, controlling the net part of the movable screen plate to be positioned in the right channel in the fan frame, the plate part to be positioned in the left channel in the fan frame to close the left channel, the right channel to work unilaterally, and the gap between the movable screen plate and the fixed filter screen according to
And determining, and then entering step 4); y1 is a preset oil smoke concentration threshold;
3.2) if ya and yb are not different, controlling the movable screen plate to be positioned at the middle position in the left-right direction in the fan frame and to be in a vertical or nearly vertical state, and then entering the step 4);
4) acquiring current position information of a moving screen plate;
5) judging whether the position is matched with the current cooking scene, if so, entering the step 6), otherwise, driving the moving screen plate to the corresponding position, 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;
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 11), if Qm < Qx, go back to step 6);
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 of an air inlet channel between the current movable screen plate and the fixed filter screen is minimum or not, and if so, prompting maintenance; if not, the movable screen plate is lowered, the air inlet channel is reduced, and the step 6 is returned to);
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 air inlet channel gap between the current movable screen plate and the fixed filter screen is the maximum, if so, prompting to clean, otherwise, heightening the movable screen plate, enlarging the air inlet channel, and returning to the step 6).
Preferably, in step 3), if
Judging that the difference between ya and yb exceeds the threshold value, if
Ya and yb are considered to be no difference, where m1 represents a preset difference threshold.
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 moving screen plate;
11) judging whether the current position of the movable screen plate is matched with the current cooking scene, if so, entering the step 12), otherwise, driving the movable screen 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 current moving screen plate and the fixed filter screen is minimum or not, and if so, prompting maintenance; if not, the movable screen plate is lowered, the gap is reduced, and the step 12) is returned;
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 current movable screen plate and the fixed filter screen is the maximum, if so, prompting to clean, otherwise, heightening the movable screen plate, enlarging the gap, and returning to the step 12).
Preferably, in step 9), when the cooking device is in a single-side cooking scene mainly involving left-side or right-side oil smoke absorption, the net part of the movable net plate is located at the corresponding oil smoke absorption side, the plate part closes the other side, and the gap between the movable net plate and the fixed filter screen at the large oil smoke position is larger than the gap between the movable net plate and the fixed filter screen at the small oil smoke position; when the absolute value kL-kR is less than k theta, the movable screen plate is positioned at the middle position in the left and right direction of the fan frame and is in a vertical or nearly vertical state.
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 net part of the movable net plate is driven to rotate to one side of the large oil smoke, and the other side of the movable net plate is closed by the plate part;
5) waiting for the time interval delta t, reading the position of the movable screen plate again, judging whether the position of the movable screen plate accords with the cooking state, if so, returning to the step 2), and if not, repeating the step;
6) reading the position of the current moving screen plate;
7) judging whether the position of the current moving screen plate accords with the cooking state, if so, returning to the step 2), and if not, driving the moving screen plate to run to the corresponding position;
8) waiting for the time interval delta t, reading the position of the movable screen plate again, judging whether the position of the movable screen plate accords 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 screen plate, the gap between the double-layer filter screens can be adjusted, and the air inlet states of the left side and the right side can also be adjusted, so that the resistance and the oil filtering capability are adjusted, and the multi-scene working conditions of different cooking are adapted; the movable screen plate has a turning and reversing function, so that the function can be utilized to further carry out filter screen self-cleaning, oil contamination in use is thrown away when the machine is turned off, and active maintenance and cleaning-free are realized.
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 a moving screen plate of the range hood of FIG. 2;
FIG. 4 is an exploded schematic view of the movement mechanism of the range hood motorized mesh panel 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 partial schematic view of a moving mechanism of a moving screen plate of the range hood of FIG. 5;
fig. 7 is a sectional view of the range hood according to the embodiment of the present invention in a third state;
FIG. 8 is a partial schematic view of a moving mechanism of a moving screen plate of the range hood of FIG. 7;
fig. 9 is a sectional view of the range hood according to the embodiment of the present invention in a fourth state;
FIG. 10 is a partial schematic view of a moving mechanism of a moving screen plate of the range hood of FIG. 9;
fig. 11 is a sectional view of the range hood according to the embodiment of the present invention in a fifth state;
FIG. 12 is a partial schematic view of a moving mechanism of a moving screen plate of the range hood of FIG. 11;
fig. 13 is a sectional view of a range hood according to an embodiment of the present invention in a sixth state;
FIG. 14 is a partial schematic view of a moving mechanism of a moving screen plate of the range hood of FIG. 13;
fig. 15 is a flowchart of a first control method of the range hood according to the embodiment of the present invention;
fig. 16 is a flowchart of a second control method of the range hood according to the embodiment of the present invention;
fig. 17 is a flowchart of a third control method of the range hood according to the embodiment of the present invention;
fig. 18 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 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.
The space in the fan frame 2 below the fan system 3 is divided into a left channel and a right channel. The fan frame 2 is located below the fan system 3, that is, on the oil smoke flow path, the moving screen plate 4 is located at the upstream of the fan system 3, and the moving screen plate 4 is preferably in a flat plate shape and can move inside the fan frame 2. The air inlet 11 is provided with a fixed filter screen 5, and the fixed filter screen 5 can be 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 assembly and the smoke collection cover 1.
The movable net plate 4 is rectangular, and as shown in fig. 2, the left-right direction is the length direction of the movable net plate 4. The moving mesh plate 4 includes a mesh portion 41 and a plate portion 42 arranged in the longitudinal direction, and preferably, the mesh portion 41 and the plate portion 42 each occupy half of the longitudinal direction. The net portion 41 is provided with a mesh 411. The movable mesh plate 4 can rotate in the fan frame 2 around an axis extending back and forth. The web portion 41 mates with the left and right side channels, respectively, and the plate portion 42 also mates with the left and right side channels, respectively.
The inside of the fan frame 2 is also provided with a movement mechanism for driving the moving screen plate 4 to move, which comprises a bracket 71, a lifting block 72, a deflector rod 73, a gear 74, a rack 75, a connecting rod 76 and a driving mechanism 77. The support 71 is fixedly disposed on the inner side of the fan frame 2, and may be directly connected and fixed to the inner side of the fan frame 2, or may be connected and fixed to the inner side of the fan frame 2 by a mounting plate or the like. In the present embodiment, the bracket 71 is disposed at the rear side in the fan frame 2, and the above-mentioned movable mesh plate 4 is disposed at the front side of the bracket 71.
A slide groove 711 extending vertically is formed in the bracket 71, and the lift block 72 is slidably engaged with the bracket 71 so as to be movable vertically along the slide groove 711. The connecting rod 76 extends forwards and backwards through the lifting block 72, can rotate relative to the lifting block 72, and is connected and fixed with the movable mesh plate 4 through the end part of the front side of the lifting block 72. Preferably, the movable net plate 4 is rectangular, and the connecting rod 76 is connected to the middle position of the movable net plate 4 in the length direction. The end of the link 76 passing to the rear side of the lifting block 72 is connected to the gear 74, preferably to the center of the gear 74, and can rotate synchronously with the gear 74.
The driving lever 73 is partially arranged in the lifting block 72, a through hole 721 is formed in one side of the lifting block 72, which is far away from the sliding groove 711, the driving lever 73 comprises a rod body 731 arranged in the lifting block 72, a shifting portion 732 capable of penetrating out of the lifting block 72 from the through hole 721 and a clamping portion 733 penetrating out of the rear side of the lifting block 72, and the shifting portion 732 and the clamping portion 733 are both arranged on the rod body 731. The toggle lever 73 can be moved forward and backward relative to the lift block 72 by operating the toggle portion 732. The gear 74 is held between the holding portions 733 so as to be rotatable with respect to the holding portions 733 and movable forward and backward with the holding portions 733. A rack 75 is fixedly arranged on the bracket 71 and can be engaged with the gear 74. Thus, the link 76, gear 74 and lever 73 can move up and down with the elevator block 72.
The upper end and the lower end of the bracket 71 are respectively provided with a gear shift auxiliary fork 712, wherein the downward end of the upper gear shift auxiliary fork 712 is opened to form a first guide groove 713 which is concave from bottom to top, and the front end of the first guide groove 713 is gradually inclined backwards from bottom to top. The downward gear shift auxiliary fork 712 has an opening at its upward end to form a second guide slot 714 recessed from top to bottom, and the rear end of the second guide slot 714 is inclined forward from top to bottom. The rack 75 is located between the two gear shift auxiliary forks 712 in the up-down direction, and the length of the rack 75 in the up-down direction is smaller than the length of the portion of the slide groove 711 of the bracket 71 located between the two gear shift auxiliary forks 712, thereby allowing the rack 75 to mesh with only one of the stages when the gear 74 moves up and down with the elevator block 72.
The driving mechanism 77 is a linear driving mechanism, such as a combination of an electric push rod and a motor screw nut, and the output end of the linear driving mechanism can be directly or indirectly connected with the lifting block 72, so as to drive the lifting block 72 to move up and down along the sliding groove 711 on the bracket 71.
When the driving mechanism 77 drives the lifting block 72 to lift, when the gear 74 is engaged with the rack 75, the gear 74 rotates along the axis extending back and forth, the movable screen plate 4 can be driven to rotate by the connecting rod 76, and when the gear 74 and the rack 75 are staggered up and down and are not engaged, the movable screen plate 4 only moves up and down along with the lifting block 72. When the striking part 732 of the striking lever 73 contacts the upper gear shift auxiliary fork 712, it can move backward under the guiding action of the first guide groove 713, so that the gear 74 and the rack 75 are shifted forward and backward, and can thereby bypass the rack 75 when moving up and down. When the toggle part 732 of the toggle lever 73 contacts the lower gear shift assist fork 712, it can move forward under the guidance of the second guide groove 714 so that the gear 74 and the rack 75 are flush in the front-rear direction, so that the gear 74 can mesh with the rack 75.
In the present embodiment, the up-and-down movement and rotation of the rotating member are realized by one driving mechanism 77 in combination with a gear, a rack, a gear changed into an auxiliary fork, and the like, and alternatively, the gear 74 may be independently driven by two sets of driving mechanisms 77 to move up-and-down and rotate (in this case, one set of driving mechanism 77 is a rotation driving mechanism). Further, the gear 74 and the rack 75 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 capacity 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 invention, the air inlet main channel can be adjusted by rotating the movable screen plate 4 according to the oil smoke condition of the working condition through the movement of the movable screen plate 4, so that the channel with larger area is positioned at the large oil smoke side, the system resistance can be changed by adjusting the gap between the filter screens according to the smoke volume or the system resistance, the large oil smoke preferentially ensures the oil smoke absorption, and the small oil smoke preferentially ensures the oil filtering.
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 cooking situations with cooking states (characteristic values of temperature, temperature variation, oil smoke, etc.) on the left and right sides being similar, the lifting block 72 is located near the upper end of the chute 711, the gears 74 are engaged with each other near the upper ends of the racks 75, and at this time, the movable screen 4 is rotated to a vertical state under the action of the gears and the racks and is located at the middle position in the left and right direction in the fan frame 2, so that the resistance of the left and right channels in the fan frame 2 is consistent, and the air volume is also consistent.
Referring to fig. 5 and 6, the second operating state of the range hood of the present invention is suitable for cooking situations where the difference between the left and right sides is large, the right side has a main oil smoke absorption effect, and the whole oil smoke is moderately large, at this time, the gear 74 is located at the rear side of the rack 75, the net portion 41 of the movable screen plate 4 is located in the right channel of the blower frame 2, and the left channel is closed by the plate portion 42, so that the main flow is at the right side, the left side has a large resistance, and the gap between the movable screen plate 4 and the fixed filter screen 5 is large, and the oil smoke absorption is preferred. Vice versa, see fig. 11 and 12.
Referring to fig. 7 and 8, in a third operating state of the range hood of the present invention, based on fig. 5 and 6, the lifting block 72 continues to move downward, and since the gear 74 and the rack 75 are not engaged, the moving screen plate 4 only moves downward along with the lifting block 72 until the shifting portion 732 of the shifting lever 73 enters the bottom end of the second guiding groove 714, the shifting lever 73 drives the gear 74 to move forward, so as to prepare for the next reversing, the gap between the moving screen plate 4 and the fixed screen 5 is small, and oil filtering is preferred. Vice versa, see fig. 13 and 14.
The range hood of the invention has the following control methods. In the first control method, a position sensor can be arranged on the movable screen plate 4 and used in combination with a left oil smoke sensor and a right oil smoke sensor, and both 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; the range hood has no power or current detection feedback. Referring to fig. 15, 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, and obtaining the current left oil smoke concentration and the current right oil smoke concentration; and reading the stored soot concentration threshold y 1;
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 represents a preset difference threshold value, 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
Indicating a significant large difference in oil concentration on both sides, then ya and yb are compared and controlled accordingly according to the comparison:
3.1.1) if ya > yb, controlling the moving screen plate 4The net part 41 is located at the left side passage, the plate part 42 is located at the right side passage to close the right side passage, the left side passage works unilaterally, and the gap between the movable net plate 4 and the fixed net 5 can be determined according to the gap
The determination, such as the presetting of a table,
corresponding to the gaps one by one, and then entering the step 4);
3.1.2) if ya < yb, the net part 41 of the movable net plate 4 is controlled to be positioned in the right channel, the plate part 42 is positioned in the left channel to close the left channel, the right channel is operated unilaterally, and the gap between the movable net plate 4 and the fixed screen 5 can be determined according to
The determination, such as the presetting of a table,
corresponding to the gaps one by one, and then entering the step 4);
3.2) if
If the oil smoke concentration on the two sides is not different, the movable screen plate 4 is controlled to be positioned at the middle position in the left-right direction in the fan frame 2 and to be in a vertical or nearly vertical state, and then the step 4) is carried out;
4) acquiring current position information of the moving screen plate 4 through a position sensor and an angle sensor on the moving screen plate 4;
5) judging whether the position is matched with the current cooking scene, if so, returning to the step 2), otherwise, driving the movable screen plate 4 to the corresponding position by the driving mechanism 77, and after waiting for the 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 consideration is given toThe dynamic change of the oil smoke concentration value of the oil smoke sensor 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 oil smoke sensor 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. 16, 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, and obtaining the current left oil smoke concentration and the current right oil smoke concentration; and reading the stored soot concentration threshold y 1;
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 represents a preset difference threshold value, 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
Indicating a significant large difference in oil concentration on both sides, then ya and yb are compared and controlled accordingly according to the comparison:
3.1.1) if ya > yb, the net part 41 of the moving net plate 4 is controlled to be positioned in the left-hand channel, the plate part 42 is positioned in the right-hand channel to close the right-hand channel, the left-hand channel is operated unilaterally, and the gap between the moving net plate 4 and the fixed screen 5 can be determined according to
The determination, such as the presetting of a table,
corresponding to the gaps one by one, and then entering the step 4);
3.1.2) if ya < yb, the net part 41 of the movable net plate 4 is controlled to be positioned in the right channel, the plate part 42 is positioned in the left channel to close the left channel, the right channel is operated unilaterally, and the gap between the movable net plate 4 and the fixed screen 5 can be determined according to
The determination, such as the presetting of a table,
corresponding to the gaps one by one, and then entering the step 4);
3.2) if
If the oil smoke concentration on the two sides is not different, the movable screen plate 4 is controlled to be positioned at the middle position in the left-right direction in the fan frame 2 and to be in a vertical or nearly vertical state, and then the step 4) is carried out;
4) acquiring current position information of the moving screen plate 4 through a position sensor and an angle sensor on the moving screen plate 4;
5) judging whether the position is matched with the current cooking scene, if so, entering the step 6), if not, driving the movable screen plate 4 to the corresponding position by the driving mechanism 77, 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);
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) 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 of an air inlet channel between the current movable screen plate 4 and the fixed filter screen 5 is minimum or not, and if so, prompting maintenance; if not, the movable screen plate 4 is lowered, the air inlet channel is reduced, and the step 6 is returned to);
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 air inlet channel gap between the movable screen plate 4 and the fixed filter screen 5 is the maximum or not, if so, prompting to clean, otherwise, heightening the movable screen plate 4, enlarging the air inlet channel, 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 range hood detects the rotating step only by the driving mechanism, or the rotating angle is calculated based on the rotating speed and the time product to judge the position of the movable screen plate 4, the range hood is provided with a temperature sensor for use, the range hood can automatically switch the on-off range hood state, 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. 17, 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 temperature values with different time exist, 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 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 temperature values suddenly change or not, if so, adjusting the positions of the large oil smoke in various states to operate, namely when the large oil smoke on the left side exists, controlling the net part 41 of the movable net plate 4 to be positioned on the left side and the gap between the net part and the fixed filter screen 5 to be larger, closing the channel on the right side by the plate part 42, and when the large oil smoke on the right side exists, defaulting a large gear by the fan system 3, and entering the step 10); if not, adjusting the small oil smoke position to each state to operate, namely when the left side small oil smoke exists, controlling the net part 41 of the movable net plate 4 to be positioned at the left side and the gap between the net part and the fixed filter screen 5 to be smaller, closing the right side channel by the plate part 42, and when the right side small oil smoke exists, on the contrary, defaulting the small gear of the fan system 3, and entering the step 10); when the absolute value kL-kR is less than k theta, the movable screen plate 4 is positioned at the middle position in the left-right direction of the fan frame 2 and is in a vertical or nearly vertical state;
10) obtaining current position information through the motor rotation step or angle of the driving mechanism 77 corresponding to the moving screen plate 4;
11) judging whether the position is matched with the current cooking scene, if so, entering the step 12), if not, driving the moving screen plate 4 to the corresponding position by the driving mechanism 77, and returning to the 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 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 current moving screen plate 4 and the fixed filter screen 5 is minimum or not, and if so, prompting maintenance; if not, the movable screen plate 4 is lowered, the air inlet channel is reduced, and the step 12 is returned to);
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) and (4) judging whether the gap between the movable screen plate 4 and the fixed filter screen 5 is the maximum or not, if so, prompting to clean, otherwise, heightening the movable screen plate 4, enlarging the air inlet channel, and returning to the step 12).
In the fourth control method, the driving mechanism detects the rotating steps, or the rotating angle is calculated based on the product of the rotating speed and the time, so that the user can select a mode or other sensor feedback values. Referring to fig. 18, 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 obtained by user input or smoke stove electric feedback or smoke and infrared sensors, and all the cooking states can be summarized as the amount of oil smoke;
3) judging whether the difference between the left side and the right side is larger than a preset threshold value, if so, indicating that obvious difference exists, and if not, indicating that the two sides are almost cooking scenes, for example, comparing the oil smoke quantity or the temperature, wherein the judgment mode can be the first control method, the second control method and the third control method, or the judgment method commonly used in the field can be adopted; if yes, entering step 4), if no, entering step 6);
4) the driving mechanism 77 is started, the net part 41 of the movable net plate 4 is turned to the side of the large oil smoke, and the other side is closed by the plate part 42;
5) waiting for the time interval delta t, reading the position of the driving mechanism 77 or the movable screen plate 4 again, judging whether the moving mechanism adjusts the movable screen plate 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 moving screen plate 4 according to the step or angle of the motor of the driving mechanism 77;
7) judging whether the position of the movable screen plate 4 at present accords with the cooking state, if so, returning to the step 2), and if not, driving the movable screen plate 4 to move to the corresponding position;
8) waiting for the time interval delta t, reading the position of the driving mechanism 77 or the movable screen plate 4 again, judging whether the moving mechanism adjusts the movable screen plate 4 to be in place, if so, returning to the step 2), and if not, repeating the step.
Claims (12)
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 range hood is characterized in that a movable screen plate (4) is arranged below the fan system (3) in the fan frame (2), the movable screen plate (4) comprises a net part (41) and a plate part (42) which are arranged along the length direction, the range hood further comprises a moving mechanism for driving the movable screen plate (4) to move, the moving mechanism comprises a linear-rotary motion converting mechanism, the linear-rotary motion converting mechanism comprises a first converting part and a second converting part, the movable screen plate (4) is connected and fixed with the first converting part and can synchronously move in the up-down direction, the first converting part and the second converting part can be selectively matched, when the first converting part and the second converting part are matched, the first converting part rotates around an axis extending from front to back and drives the movable screen plate (4) to rotate, so that the net part (41) and the plate part (42) of the movable screen plate (4) can be switched between the left side and the right side in the fan frame (2), the gap between the movable screen plate (4) and the fixed filter screen (5) can be adjusted.
2. The range hood of claim 1, wherein: the movement mechanism further comprises a lifting block (72) and a connecting rod (76), the lifting block (72) can move in the up-down direction, the connecting rod (76) extends through the lifting block (72) back and forth and can rotate relative to the lifting block (72), and two ends, penetrating out of the lifting block (72), of the connecting rod (76) are respectively connected and fixed with the rotating screen plate (4) and the first conversion component.
3. The range hood of claim 2, wherein: the moving mechanism further comprises a support (71) fixedly arranged on the inner side of the fan frame (2) and a driving mechanism (77), a sliding groove (711) extending up and down is formed in the support (71), and the lifting block (72) is in sliding fit with the support (71) and can be driven by the driving mechanism (77) to move up and down along the sliding groove (711).
4. The range hood of claim 3, wherein: the first conversion part is a gear (74), the second conversion part is a rack (75), the moving mechanism further comprises a shifting lever (73), the shifting lever (73) comprises a lever body (731) arranged in the lifting block (72), a shifting part (732) penetrating out of the lifting block (72) for shifting forward and backward and a clamping part (733) penetrating out of the lifting block (72), the shifting part (732) and the clamping part (733) are both arranged on the lever body (731), the gear (74) is clamped between the clamping parts (733), the gear (74) can rotate relative to the clamping part (733) and can move forward and backward along with the clamping part (733), and the rack (75) is fixedly arranged on the support (71), so that the gear (74) is meshed with or separated from the rack (75) when moving forward and backward.
5. The range hood of claim 4, wherein: the upper end and the lower end of the support (71) are respectively provided with a gear position changing auxiliary fork (712), the downward end of the upper gear position changing auxiliary fork (712) is opened to form a first guide groove (713) which is concave from bottom to top, the front end of the first guide groove (713) is gradually inclined backward from bottom to top, the upward end of the lower gear position changing auxiliary fork (712) is opened to form a second guide groove (714) which is concave from top to bottom, the rear end of the second guide groove (714) is gradually inclined forward from top to bottom, the rack (75) is positioned between the two gear position changing auxiliary forks (712) in the up-down direction, and the length of the rack (75) in the up-down direction is smaller than the length of the part, between the two gear position changing auxiliary forks (712), of the sliding groove (711) on the support (71).
6. A control method of a range hood as claimed in any one of claims 1 to 5, wherein: 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, and controlling according to the comparison result:
3.1) if the difference between ya and yb exceeds a threshold, comparing ya and yb, and controlling accordingly according to the comparison result:
3.1.1) if ya > yb, the net part (41) of the movable screen plate (4) is controlled to be positioned in the left channel in the fan frame (2), the plate part (42) is positioned in the right channel in the fan frame (2) to close the right channel, the left channel works unilaterally, and the gap between the movable screen plate (4) and the fixed screen (5) works according to the conditions that ya > yb
And determining, and then entering step 4); y1 is a preset oil smoke concentration threshold;
3.1.2) if ya < yb, controlling the net part (41) of the movable screen plate (4) to be positioned in the right channel in the fan frame (2), the plate part (42) to be positioned in the left channel in the fan frame (2) to close the left channel, the right channel to work unilaterally, and the gap between the movable screen plate (4) and the fixed filter screen (5) according to
And determining, and then entering step 4); y1 is a preset oil smoke concentration threshold;
3.2) if ya and yb are not different, controlling the movable screen plate (4) to be positioned at the middle position in the left-right direction in the fan frame (2) and to be in a vertical or nearly vertical state, and then entering the step 4);
4) acquiring current position information of the moving screen plate (4);
5) and judging whether the position is matched with the current cooking scene, if so, returning to the step 2), otherwise, driving the moving screen plate (4) to the corresponding position, and after waiting for a time interval delta ta, returning to the step 4).
7. The control method of the range hood according to claim 6, characterized in that: in step 3), if
Judging that the difference between ya and yb exceeds the threshold value, if
Ya and yb are considered to be no difference, where m1 represents a preset difference threshold.
8. A control method of a range hood as claimed in any one of claims 1 to 5, wherein: 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, and controlling according to the comparison result:
3.1) if the difference between ya and yb exceeds a threshold, comparing ya and yb, and controlling accordingly according to the comparison result:
3.1.1) if ya > yb, the net part (41) of the movable screen plate (4) is controlled to be positioned in the left channel in the fan frame (2), the plate part (42) is positioned in the right channel in the fan frame (2) to close the right channel, the left channel works unilaterally, and the gap between the movable screen plate (4) and the fixed screen (5) works according to the conditions that ya > yb
And determining, and then entering step 4); y1 is a preset oil smoke concentration threshold;
3.1.2) if ya < yb, controlling the net part (41) of the movable screen plate (4) to be positioned in the right channel in the fan frame (2), the plate part (42) to be positioned in the left channel in the fan frame (2) to close the left channel, the right channel to work unilaterally, and the gap between the movable screen plate (4) and the fixed filter screen (5) according to
And determining, and then entering step 4); y1 is a preset oil smoke concentration threshold;
3.2) if ya and yb are not different, controlling the movable screen plate (4) to be positioned at the middle position in the left-right direction in the fan frame (2) and to be in a vertical or nearly vertical state, and then entering the step 4);
4) acquiring current position information of the moving screen plate (4);
5) judging whether the position is matched with the current cooking scene, if so, entering the step 6), otherwise, driving the movable screen plate (4) to the corresponding position, 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 11), if Qm < Qx, go back to step 6);
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 of an air inlet channel between the current movable screen plate (4) and the fixed filter screen (5) is minimum or not, and if so, prompting maintenance; if not, the movable screen plate (4) is lowered, the air inlet channel is reduced, and the step 6 is returned;
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 (3) judging whether the air inlet channel gap between the current movable screen plate (4) and the fixed filter screen (5) is the maximum, if so, prompting to clean, otherwise, heightening the movable screen plate (4), enlarging the air inlet channel, and returning to the step 6).
9. The control method of the range hood according to claim 8, characterized in that: in step 3), if
Judging that the difference between ya and yb exceeds the threshold value, if
Ya and yb are considered to be no difference, where m1 represents a preset difference threshold.
10. A control method of a range hood as claimed in any one of claims 1 to 5, wherein: 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 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 moving screen plate (4);
11) judging whether the current position of the movable screen plate (4) is matched with the current cooking scene, if so, entering the step 12), otherwise, driving the movable screen plate (4) 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 (3);
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 (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 current moving screen plate (4) and the fixed filter screen (5) is minimum or not, and if so, prompting maintenance; if not, the movable screen plate (4) is lowered, the gap is reduced, and the step 12 is returned;
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 screen plate (4) and the fixed filter screen (5) is the largest or not, if so, prompting to clean, otherwise, heightening the movable screen plate (4), enlarging the gap and returning to the step (12).
11. The control method of the range hood according to claim 10, characterized in that: in the step 9), when the cooking scene is in a single-side cooking scene mainly taking oil smoke absorption on the left side or the right side, the net part (41) of the movable screen plate (4) is positioned on the corresponding oil smoke absorption side, the plate part (42) closes the other side, and the gap between the movable screen plate (4) and the fixed filter screen (5) at the position of large oil smoke is larger than the gap between the movable screen plate (4) and the fixed filter screen (5) at the position of small oil smoke; when the | kL-kR | is less than k theta, the movable screen plate (4) is positioned at the middle position in the left-right direction of the fan frame (2) and is in a vertical or nearly vertical state.
12. A control method of a range hood as claimed in any one of claims 1 to 5, wherein: 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 net part (41) of the movable net plate (4) is driven to rotate to one side with large oil smoke, and the other side is closed by a plate part (42);
5) waiting for the time interval delta t, reading the position of the movable screen plate (4) again, judging whether the position of the movable screen plate (4) accords with the cooking state, if so, returning to the step 2), and if not, repeating the step;
6) reading the position of the current moving screen plate (4);
7) judging whether the position of the current moving screen plate (4) accords with the cooking state, if so, returning to the step 2), and if not, driving the moving screen plate (4) to move to the corresponding position;
8) and waiting for the time interval delta t, reading the position of the movable screen plate (4) again, judging whether the position of the movable screen plate (4) accords with the cooking state, returning to the step 2 if the position of the movable screen plate accords with the cooking state, and repeating the step if the position of the movable screen plate does not accord with the cooking state.
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