Range hood and control method thereof

Abstract

The invention discloses an extractor hood and a control method thereof.The extractor hood comprises an exhaust fume collecting hood, a first plate and a second plate, and an exhaust fume inlet is formed in the exhaust fume collecting hood; the first plate piece and the second plate piece can be in the following working states: in the first working state, the first plate piece and the second plate piece are arranged below a smoke inlet in parallel in the left-right direction of the range hood, and the first plate piece and the second plate piece are tightly attached or close to each other, so that the smoke deflector for annular suction is integrally formed; in the second working state, one plate extends downwards from the left side or the position close to the left side of the exhaust fume collecting hood, the other plate extends downwards from the right side or the position close to the right side of the exhaust fume collecting hood, and therefore all the plates form baffles; and in the third working state, one plate is located below the smoke inlet to form an annular suction smoke guide plate, and the other plate extends downwards from the corresponding side position of the smoke collecting hood to form a baffle.

Description

Technical Field

[0001] The present invention relates to an oil fume purification device, in particular to a range hood and a control method for the range hood. Background Art

[0002] A range hood is a kitchen appliance for purifying the kitchen environment. It can quickly extract and discharge the waste generated by stove combustion and the oil fumes produced during the cooking process outdoors, reduce pollution, and purify the air.

[0003] The top - suction range hood has little intrusion into the operation space above the cooker and is relatively easy to match with the cabinet. However, because its smoke inlet is relatively far from the smoke source, when facing external interfering airflows such as the opening and closing of doors and windows or someone walking by, its anti - interference ability is poor. Although in recent years, some products have replaced the original middle - inlet net with a negative - pressure - expanding plate, making its negative - pressure area expand and descend to a certain extent. For example, a smoke - guiding mechanism disclosed in a Chinese invention patent with the application number 202410327435.0 includes a smoke - guiding plate. An oil - collecting port is opened on the smoke - guiding plate, and an oil cup is arranged below the oil - collecting port. The oil cup is detachably fixed to the smoke - guiding plate through at least one hook member arranged on the smoke - guiding plate. The air inlets are designed symmetrically left and right, and the external airflows entering the fan assembly are basically symmetrical. When only one burner is turned on, the oil fumes are mainly concentrated on the left side (or the right side, taking the left side as an example). The proportion of mixed oil fumes on the left side is high, but the air still enters normally on the right side, resulting in a large waste of flow rate, weakening its anti - interference ability (when people walk or a side wind blows) and the capturing ability of the oil fumes after they rise and overflow. The anti - interference ability still needs to be improved urgently. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a range hood with an adjustable air - inlet path and strong anti - interference ability in view of the deficiencies of the above - mentioned existing technologies.

[0005] The second technical problem to be solved by the present invention is to provide a control method for the above - mentioned range hood.

[0006] The technical solution adopted by the present invention to solve the above - mentioned first technical problem is as follows: A range hood includes a smoke - collecting hood, a first plate member, and a second plate member. The smoke - collecting hood is formed with a smoke inlet, and it is characterized in that:

[0007] The first plate member and the second plate member can be in the following working states:

[0008] The first working state: The first plate member and the second plate member are arranged side by side in the left - right direction of the range hood below the smoke inlet, and the first plate member and the second plate member are in contact or close to each other, so as to integrally form a smoke - guiding plate for annular suction;

[0009] The second working state: one of the plates extends downward from the left side of the smoke hood or a position close to the left side, and the other plate extends downward from the right side of the smoke hood or a position close to the right side, so that each plate is constituted as a baffle;

[0010] The third working state: one of the plates is located below the smoke inlet to form a circular smoke guide plate, and the other plate extends downward from the corresponding side position of the smoke collecting hood to form a baffle.

[0011] By setting up two panels that can change their position relative to the smoke hood, the air inlet path is changed, taking into account the advantages of traditional top suction and side suction, and improving the anti-interference ability, the cooking space can be returned to the user without the interference of side traffic and window airflow, which is convenient for users to carry out cooking operations that take up a lot of space such as high pot steaming. When stir-frying is still needed in a strong interference environment such as opening and closing doors and windows and walking traffic, the interference side can be switched to the baffle state to maximize the anti-side interference ability and sacrifice part of the cooking space to achieve a better oil fume absorption effect.

[0012] Preferably, in order to facilitate switching of the plate to a desired position, the first plate and the second plate respectively perform non-fixed axis rotation relative to the smoke collecting hood.

[0013] In order to facilitate the driving of the plate members to move, the range hood further comprises a movement mechanism, and each plate member corresponds to a movement mechanism.

[0014] Preferably, the movement mechanism includes a driving mechanism and a driving connecting rod driven to rotate by the driving mechanism, the driving connecting rod is rotatably connected to the smoke hood and the corresponding plate respectively, and the driving connecting rod includes at least two connecting rods rotatably connected end to end.

[0015] Preferably, the driving connecting rod comprises a first connecting rod and a second connecting rod connected end to end, the first connecting rod is also connected to the smoke collecting hood, and the second connecting rod is also connected to the corresponding plate, and the driving mechanism is in transmission connection with the first connecting rod to drive the first connecting rod to rotate.

[0016] Preferably, in order to improve the movement stability of the plate, the movement mechanism further includes a driven connecting rod, which is rotatably connected to the smoke hood and the corresponding plate respectively, and the driven connecting rod also includes at least two connecting rods rotatably connected end to end.

[0017] The technical solution adopted by the present invention to solve the second technical problem is: a control method of the range hood as described above, characterized in that: the control method comprises the following steps:

[0018] 1) The range hood starts and runs at the default gear;

[0019] 2) Obtain the air flow velocities on the left and right sides of the smoke collecting hood, which are Qa and Qb respectively; obtain the oil fume concentration values on the left and right sides of the smoke collecting hood, which are ya and yb respectively;

[0020] 3) Denote the larger value among ya and yb as yd, and compare yd with a preset first oil fume concentration threshold y1. If yd ≤ y1, proceed to step 4); if yd > y1, then proceed to step 5);

[0021] 4) Judge it as a small smoke scenario, maintain the current state of each plate member, and then proceed to step 8);

[0022] 5) Judge it as a large smoke scenario, and compare whether there is an obvious difference between the two air flow values. If so, proceed to step 6); if not, then proceed to step 7);

[0023] 6) Switch the plate member on the side with the larger air flow to the baffle state, and then proceed to step 8);

[0024] 7) Compare yd with a preset second oil fume concentration threshold y2. If yd ≤ y2, maintain the current state of each plate member, and then proceed to step 8); if yd > y2, then both plate members are switched to the baffle state, and then proceed to step 8); y2 > y1;

[0025] 8) Obtain the position information of the two plate members;

[0026] 9) Judge whether the position matches the current cooking scenario. If not, switch the plate member to the corresponding state, wait for a certain period of time, and then return to step 2).

[0027] To avoid misjudgment, in step 5), if then it indicates an obvious difference. If then it indicates no obvious difference, and m1 is a preset difference value threshold.

[0028] Preferably, for the convenience of detecting each value, air flow sensors are respectively arranged on both sides of the smoke collecting hood to obtain air flow velocity values, oil fume sensors are respectively arranged on the left and right sides of the smoke collecting hood to obtain oil fume concentration values, and position sensors are respectively arranged on the left and right sides of the smoke collecting hood to obtain the positions of the corresponding plate members.

[0029] Compared with the prior art, the advantages of the present invention are: by setting two plates that can change their positions relative to the smoke hood, the air inlet path is changed, the advantages of traditional top suction and side suction are taken into account, and the anti-interference ability is improved, so that the cooking space can be returned to the user without the interference of side traffic and window airflow, which is convenient for users to perform cooking operations that take up a large space such as high pot steaming. When stir-frying is still needed in a strong interference environment such as opening and closing doors and windows and walking traffic, the interference side can be switched to the baffle state to improve the anti-side interference ability as much as possible, and sacrifice part of the cooking space to achieve a better oil fume absorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a range hood in a first working state according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of one of the rectifiers of the range hood according to the embodiment of the present invention after being flipped relative to the first working state (third working state);

[0032] Figure 3 for Figure 2 A cross-sectional view of

[0033] Figure 4 for Figure 3 A schematic diagram of the partial enlargement of Ⅰ;

[0034] Figure 5 for Figure 3 A partial II enlarged schematic diagram of

[0035] Figure 6 is a schematic diagram of a range hood in a second working state according to an embodiment of the present invention;

[0036] Figure 7 4 is a control flow chart of the range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the disclosed embodiments of the present invention can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0039] See Figures 1 to 5 , an oil fume extractor, which is a top - suction type oil fume extractor, includes a smoke collecting hood 1, a first plate member 21 and a second plate member 22. The smoke collecting hood 1 is formed with a smoke inlet 11. The fan system of the oil fume extractor and the like are not shown in the figure, which is the same as the prior art.

[0040] The first plate member 21 and the second plate member 22 are arranged along the left - right direction of the oil fume extractor (the left - right direction relative to the user in the installation state). When the oil fume extractor is in the first working state, the first plate member 21 and the second plate member 22 are located below the smoke inlet 11 and are arranged side by side. See Figure 1 , the first plate member 21 is located on the left side of the second plate member 22. The right edge of the first plate member 21 and the left edge of the second plate member 22 can be in close contact or close proximity (only leaving a small movement gap). At this time, the first plate member 21 and the second plate member 22 as a whole function as a ring - suction smoke guiding plate (ring - suction means that the oil fume is sucked upward from the periphery of the plate member into the smoke inlet 11). The oil fume enters the smoke inlet 11 upward along the periphery of the plate member formed by the first plate member 21 and the second plate member 22, realizing negative - pressure outward expansion, so that the negative - pressure area of the top - suction type oil fume extractor moves downward from the inside of the smoke collecting hood 1 to the lower end of the bottom area of the smoke collecting hood 1, increasing the downward extension of the smoke - control area and reducing the escape of oil fume. When the oil fume extractor is in the second working state, the first plate member 21 extends downward from the left side or a position close to the left side of the smoke collecting hood 1 (allowing it to be inclined and not perpendicular to the horizontal plane), and the second plate member 22 extends downward from the right side or a position close to the right side of the smoke collecting hood 1 (allowing it to be inclined and not perpendicular to the horizontal plane). See Figure 6The lowest position of the first plate 21 is located on the left side of the left burner (not shown) of the stove, and the lowest position of the second plate 22 is located on the right side of the right burner (not shown) of the stove. At this time, the oil smoke rises upward and directly enters the smoke inlet 11. The first plate 21 and the second plate 22 act as baffles on the left and right sides to reduce the interference of the side airflow, further improve the anti-interference ability, reduce the external airflow interference when people walk and doors and windows are opened, and improve the oil smoke extraction effect and system stability (the range hood can be turned off when not in use without affecting the appearance experience).

[0041] To facilitate the movement of the first plate 21 and the second plate 22, the range hood further includes a motion mechanism, and each plate corresponds to a motion mechanism. The motion mechanism is a variable rotation center multi-link mechanism, so that the corresponding plate performs non-fixed axis rotation. The motion mechanism includes a driving mechanism, a driving connecting rod 31 and a driven connecting rod 32 to achieve the position switching of the corresponding plate. The driving mechanism is not shown in the figure, and can be a commonly used motor to drive the above-mentioned driving connecting rod 31 to rotate. One end of the driving connecting rod 31 is rotationally connected to the smoke hood 1, and the other end is rotationally connected to the corresponding plate. One end of the driven connecting rod 32 is rotationally connected to the smoke hood 1, and the other end is rotationally connected to the corresponding plate, so that the movement of the corresponding plate is stable. The connection points of the driving connecting rod 31 and the driven connecting rod 32 with the smoke hood 1 do not overlap, and the connection points of the driving connecting rod 31 and the driven connecting rod 32 with the corresponding plate do not overlap. The driving connecting rod 31 and the driven connecting rod 32 are rotationally connected. In order to realize the movement of the variable rotation center, the driving connecting rod 31 includes at least two connecting rods connected to each other in rotation. In this embodiment, it includes a first connecting rod 311 and a second connecting rod 312 connected end to end. The first connecting rod 311 is also connected to the smoke hood 1, and the second connecting rod 312 is also connected to the corresponding plate. The driving mechanism is connected to the first connecting rod 311 in a transmission manner and can drive the first connecting rod 311 to rotate. The driven connecting rod 32 also includes at least two connecting rods connected to each other in rotation. In this embodiment, it includes a third connecting rod 321 and a fourth connecting rod 322 connected to each other in rotation. The third connecting rod 321 is also connected to the smoke hood 1, and the fourth connecting rod 322 is also connected to the corresponding plate. The third connecting rod 321 is connected to the second connecting rod 312 in rotation. The rotation axis of each connecting rod extends in the front-to-back direction.

[0042] Through the above design, the range hood can be maintained in the plate state when there is no lateral interference or in the closed state, meeting the large space requirements such as high pot cooking and better matching with the static appearance, and retaining the advantages of normal plate negative pressure expansion and downward movement on the side; when there is lateral interference, the connecting rod can be driven to rotate, and the plate can be deformed into a pure baffle on the side (isolating the interfering airflow, and wrapping the oil smoke from the source in the lower area of ​​the smoke hood, reducing the impact of side wind, human movement, etc. on the airflow, further increasing the smoke cage range, and improving the oil smoke extraction effect. The motion mechanism meets completely different user scenario requirements at different positions, achieving a balance between the oil smoke extraction effect adapted to multiple working conditions and the sense of intrusion into the operating space.

[0043] Since the two plate members are driven independently, when there is air flow interference on only one side, one of the plate members can also be switched in position, and the range hood is in the third working state. As shown in Figure 2 and Figure 3 shown, it shows a mode where there is air flow interference on the right side and still requires high-fume cooking such as stir-frying. At this time, the first plate member 21 on the left side remains in the annular smoke guide plate state, while the second plate member 22 on the right side is switched to a baffle.

[0044] In addition, Figure 6 the state shown can also facilitate the internal cleaning of the range hood or intermediate cooking. For intermediate cooking, the fumes are wrapped from the source in the lower area of the smoke collecting hood, reducing the influence of side winds, people walking, etc. on the air flow, further improving the smoke enclosure range and the fume extraction effect. At this time, the flow rate is the largest in the middle.

[0045] It can also be combined with side air flow detection, infrared, smoke sensors, etc. to achieve control. For example, air flow sensors are respectively arranged on the left and right sides of the smoke collecting hood 1, and smoke sensors can also be respectively arranged on the left and right sides of the smoke collecting hood 1. Position sensors for detecting the positions of the corresponding plate members can also be respectively arranged on the left and right sides of the smoke collecting hood 1. Each type of sensor is an existing sensor, and the arrangement positions and detection methods are also the same as those in the prior art. Refer to Figure 7 , including the following steps:

[0046] 1) The range hood is started and operates at the default gear;

[0047] 2) Read the detection values of the two air flow sensors, which are Qa (the air flow speed value on the left side) and Qb (the air flow speed value on the right side) respectively. The general range is ∈[0.05, 20 m / s]; mainly considering that it can cover the convection speed of ordinary doors and windows and the walking speed of people - in strong wind weather (such as when the wind force reaches level 6, the wind speed can reach 10.8 - 13.8 m / s), there will also be a flow rate of 0.5 - 2 m / s per second on high floors when there is no wind on the ground. And when people are busy walking in the kitchen, the walking frequency may increase to 100 - 120 steps per minute, and the step length may be slightly reduced to about 0.4 - 0.6 m. At this time, the speed is about 0.7 - 1.4 m per second;

[0048] Read the detection values of the two smoke sensors, which are ya (the smoke concentration value on the left side) and yb (the smoke concentration value on the right side) respectively;

[0049] 3) Denote the larger value among ya and yb as yd, and compare it with the preset first smoke concentration threshold y1. If yd ≤ y1, go to step 4); if yd > y1, then go to step 5); y1 can be obtained through experiments and set according to experience or requirements to distinguish between high-fume scenarios and low-fume scenarios;

[0050] 4) Determine it is a small-smoke scenario, maintain the current state of each plate member, and then proceed to step 8);

[0051] 5) Determine it is a large-smoke scenario, compare whether there is an obvious difference between the two airflow values. If there is an obvious difference, indicating that the side airflow is obvious, proceed to step 6). If it indicates that there is no obvious difference, indicating that the side airflow is not obvious, proceed to step 7); m1 is the preset difference value threshold, which can be set according to experience, sensor accuracy or requirements; alternatively, the difference between the two can also be used as the judgment criterion.

[0052] 6) Switch the plate member on the side with obvious side airflow (the side with larger airflow) to the baffle state, and then proceed to step 8);

[0053] 7) Compare yd with the preset second oil fume concentration threshold y2. If yd ≤ y2, maintain the current state of each plate member, and then proceed to step 8); if yd > y2, both plate members are switched to the baffle state, and then proceed to step 8); y2 > y1, which can be set according to experience or requirements. Exceeding y2 means that even without side airflow interference, excessive absolute oil fume volume will cause oil fume to escape, such as excessive oil fume volume caused by stir-frying.

[0054] 8) Read the position information of the two plate members through two position sensors;

[0055] 9) Determine whether the position matches the current cooking scenario (the scenario determined in steps 3 and 7). If not, the driving mechanism flips the plate member to the corresponding state, waits for a certain time Δta, and then returns to step 2). Δta can be set as needed.

Claims

1. A range hood, comprising a smoke collecting hood (1), a first plate (21) and a second plate (22), wherein the smoke collecting hood (1) is formed with a smoke inlet (11), characterized in that: The first plate (21) and the second plate (22) can be in the following working states: A first working state: the first plate member (21) and the second plate member (22) are arranged side by side below the smoke inlet (11) along the left-right direction of the range hood, and the first plate member (21) and the second plate member (22) are closely attached or close to each other, so that the whole constitutes a circular smoke guide plate; The second working state: one of the plates extends downward from the left side of the smoke hood (1) or a position close to the left side, and the other plate extends downward from the right side of the smoke hood (1) or a position close to the right side, so that each plate is formed into a baffle; The third working state: one of the plates is located below the smoke inlet (11) to form a circular smoke guide plate, and the other plate extends downward from a corresponding side position of the smoke collecting hood (1) to form a baffle.

2. The range hood according to claim 1, characterized in that: The first plate member (21) and the second plate member (22) respectively perform non-fixed axis rotation relative to the smoke collecting hood (1).

3. The range hood according to claim 2, characterized in that: The range hood further comprises a motion mechanism, and each plate corresponds to a motion mechanism.

4. The range hood according to claim 3, characterized in that: The motion mechanism comprises a driving mechanism and a driving connecting rod (31) driven to rotate by the driving mechanism, wherein the driving connecting rod (31) is respectively rotatably connected to the smoke collecting hood (1) and the corresponding plate, and the driving connecting rod (31) comprises at least two connecting rods rotatably connected end to end.

5. The range hood according to claim 4, characterized in that: The driving connecting rod (31) comprises a first connecting rod (311) and a second connecting rod (312) connected end to end, the first connecting rod (311) is also connected to the smoke collecting hood (1), and the second connecting rod (312) is also connected to a corresponding plate member, and the driving mechanism is connected to the first connecting rod (311) in a transmission manner to drive the first connecting rod (311) to rotate.

6. The range hood according to claim 4, characterized in that: The movement mechanism further comprises a driven connecting rod (32), wherein the driven connecting rod (32) is rotatably connected to the smoke collecting hood (1) and the corresponding plate respectively, and the driven connecting rod (32) also comprises at least two connecting rods rotatably connected end to end.

7. A control method for a range hood according to any one of claims 1 to 6, characterized in that: The control method comprises the following steps: 1) The range hood starts and runs at the default gear; 2) obtaining the air flow velocities on the left and right sides of the smoke hood (1), which are Qa and Qb respectively; obtaining the oil smoke concentration values ​​on the left and right sides of the smoke hood (1), which are ya and yb respectively; 3) The larger value of ya and yb is recorded as yd, and yd is compared with the preset first oil smoke concentration threshold y1. If yd≤y1, go to step 4); if yd>y1, go to step 5); 4) Determine that it is a small smoke scene, maintain the current state of each panel, and then go to step 8); 5) Determine whether it is a heavy smoke scene, compare the two airflow values ​​to see if there is an obvious difference, if yes, go to step 6), if not, go to step 7); 6) The plate on the side with larger airflow is switched to baffle state, and then proceed to step 8); 7) Compare yd with the preset second oil smoke concentration threshold y2. If yd≤y2, maintain the current state of each plate, and then enter step 8); if yd>y2, both plates are switched to the baffle state, and then enter step 8); y2>y1; 8) Obtaining the position information of the two panels; 9) Determine whether the position matches the current cooking scene. If not, switch the panel to the corresponding state, wait for a certain period of time, and return to step 2).

8. The control method of the range hood according to claim 7, characterized in that: In step 5), if If there is a significant difference It means there is no obvious difference, and m1 is the preset difference value threshold.

9. The control method of the range hood according to claim 7, characterized in that: Airflow sensors are respectively arranged on both sides of the smoke hood (1) to obtain airflow velocity values, oil fume sensors are respectively arranged on the left and right sides of the smoke hood (1) to obtain oil fume concentration values, and position sensors are respectively arranged on the left and right sides of the smoke hood (1) to obtain positions of corresponding panels.

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