Oil screen device for range hood and range hood

Abstract

The utility model relates to an oil screen device for a range hood and the range hood. The oil screen device comprises a fixed frame, a filter screen and a filter screen, the tobacco guide leaves are sequentially arranged in the fixing frame at intervals in the left-right direction, all the tobacco guide leaves extend in the front-back direction, and the front end and the rear end of each tobacco guide leaf are rotationally connected to the front side and the rear side of the fixing frame; the fixing frame is divided into a left smoke guiding area and a right smoke guiding area in the left-right direction, all the smoke guiding leaves located in the left smoke guiding area are connected through a first connecting rod assembly and can be driven by the first connecting rod assembly to deflect together, and all the smoke guiding leaves located in the right smoke guiding area are connected through a second connecting rod assembly and can be driven by the second connecting rod assembly to deflect together. The first connecting rod assembly and the second connecting rod assembly are linked, so that the deflection angle of each tobacco guide leaf in the left tobacco guide area can be changed along with the change of the deflection angle of each tobacco guide leaf in the right tobacco guide area. The system has the advantage that flow can be reasonably distributed according to cooking conditions on the left side and the right side.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to an oil net device for range hoods and the range hood. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. In order to improve the oil fume extraction effect, a grille oil net that can change the direction of smoke extraction is often provided at the air inlet of the range hood. For example, the "Oil Net for Range Hood and Range Hood" with application number CN202221611897.8 (authorization announcement number: CN217876021U) discloses a grille-style oil net device, in which the grille bars of the oil net can be synchronously deflected under the action of a linkage rod, thereby changing the air inlet direction of the oil net, so as to control the direction of smoke extraction according to the location where the oil fume is generated, thereby improving the smoking effect.

[0003] However, the existing grille oil net structure often adopts a control method that is neither open nor closed, and does not consider how to distribute the flow when cooking on both sides, nor how to optimize the flow channel to ensure that each grille of the grille net is in a structural state with minimal impact on the flow field while meeting the flow distribution requirements.

[0004] Therefore, the oil net of the existing range hood needs further improvement. Utility Model Content

[0005] The first technical problem to be solved by the utility model is to provide an oil net device for a range hood which can reasonably distribute the flow rate according to the cooking conditions on the left and right sides in view of the current status of the prior art.

[0006] The second technical problem to be solved by the utility model is to provide a range hood using the above oil net device in view of the current status of the prior art.

[0007] The technical solution adopted by the utility model to solve the first technical problem is: an oil net device for a range hood, comprising:

[0008] Fixed frame;

[0009] The smoke guide blades are arranged in the fixed frame at intervals in the left-right direction, each of the smoke guide blades extends in the front-back direction, and the front and rear ends of each smoke guide blade are rotatably connected to the front and rear sides of the fixed frame, and two adjacent smoke guide blades form a smoke inlet channel;

[0010] The fixed frame is divided into a left smoke guide area and a right smoke guide area in the left and right directions. The smoke guide blades located in the left smoke guide area are connected by a first connecting rod assembly and can be deflected together under the drive of the first connecting rod assembly. The smoke guide blades located in the right smoke guide area are connected by a second connecting rod assembly and can be deflected together under the drive of the second connecting rod assembly. The first connecting rod assembly and the second connecting rod assembly are linked so that the deflection angle of each smoke guide blade in the left smoke guide area can change with the change of the deflection angle of each smoke guide blade in the right smoke guide area.

[0011] The smoke guide blades in the left smoke guide area and the right smoke guide area are respectively connected by the first connecting rod assembly and the second connecting rod assembly, thereby realizing the deflection angle control of the smoke guide blades in the left and right areas, wherein the first connecting rod assembly and the second connecting rod assembly are arranged in linkage, so that when the smoke guide blades in one of the smoke guide areas are deflected, the smoke guide blades in the other smoke guide area can also be deflected accordingly, thereby making the air volume control of the left and right smoke guide areas have multiple options to meet the needs of different cooking conditions and improve the user experience.

[0012] In order to facilitate the linkage control of the smoke guide blades in the left and right smoke guide zones, the deflection direction of the smoke guide blades in the left smoke guide zone is opposite to the deflection direction of the smoke guide blades in the right smoke guide zone, so that the deflection angle of the smoke guide blades in the left smoke guide zone relative to the vertical plane decreases as the deflection angle of the smoke guide blades in the right smoke guide zone relative to the vertical plane increases, or the deflection angle of the smoke guide blades in the left smoke guide zone relative to the vertical plane increases as the deflection angle of the smoke guide blades in the right smoke guide zone relative to the vertical plane decreases.

[0013] In order to adapt to different cooking conditions, preferably, the first connecting rod assembly and the second connecting rod assembly are linked so that each smoke guide blade in the left smoke guide area and the right smoke guide area has at least the following states:

[0014] In the first state, the smoke inlet flow channel formed by the smoke guide blades in one of the left and right smoke guide areas is open, and the deflection angle of the smoke guide blades in the smoke guide area relative to the vertical plane is the smallest, and the deflection angle of the smoke guide blades in the other smoke guide area relative to the vertical plane is the largest and they overlap in sequence to close the corresponding smoke inlet flow channel;

[0015] In the second state, the smoke inlet flow channels formed by the smoke guide blades in the left smoke guide area and the right smoke guide area are both open, wherein the deflection angle of the smoke guide blades in one smoke guide area relative to the vertical plane is greater than the deflection angle of the smoke guide blades in the other smoke guide area relative to the vertical plane;

[0016] In the third state, the smoke inlet channels formed by the smoke guide blades in the left and right smoke guide areas are both open, wherein the deflection angles of the smoke guide blades in one smoke guide area relative to the vertical plane are consistent with the deflection angles of the smoke guide blades in the other smoke guide area relative to the vertical plane.

[0017] In order to effectively improve the oil fume absorption effect in the single-sided cooking state, in the above-mentioned first state, each smoke guide blade in the smoke guide area in which the smoke inlet channel is opened extends vertically.

[0018] In order to ensure the range hood effect when cooking on the left and right sides, in the third state, the inclination direction of each smoke guide blade in the left smoke guide area is opposite to the inclination direction of each smoke guide blade in the right smoke guide area.

[0019] In order to simplify the structure of the connecting rod assembly, the first connecting rod assembly includes a first connecting rod extending in the left and right directions, and the ends of each smoke guide blade located in the left smoke guide area are rotatably connected to corresponding positions in the length direction of the first connecting rod at a position deviated from its rotation axis, and the second connecting rod assembly includes a second connecting rod extending in the left and right directions, and the ends of each smoke guide blade located in the left smoke guide area are rotatably connected to corresponding positions in the length direction of the second connecting rod at a position deviated from its rotation axis.

[0020] In order to facilitate the control of the deflection angle of the smoke guide plate and ensure the accuracy of the angle control of the smoke guide blades, each of the smoke guide blades has two opposite side edges, the position where the first connecting rod is connected to the end of each smoke guide blade in the left smoke guide area is adjacent to the side edge of the corresponding smoke guide blade, and the position where the second connecting rod is connected to the end of each smoke guide blade in the right smoke guide area is adjacent to the side edge of the corresponding smoke guide blade.

[0021] In order to realize the linkage between the smoke guide blades in the left and right smoke guide areas, the two adjacent smoke guide blades in the left smoke guide area and the right smoke guide area are respectively recorded as the first blade and the second blade, the first blade and the second blade both have a first side and a second side relative to each other, the first connecting rod is rotatably connected to the end of the first blade at a position adjacent to its first side, the second connecting rod is rotatably connected to the end of the second blade at a position adjacent to its first side, the first blade and the second blade are also connected by a third connecting rod, the end of the first blade at a position adjacent to its second side is rotatably connected to the first end of the third connecting rod, and the end of the second blade at a position adjacent to its second side is rotatably connected to the second end of the third connecting rod.

[0022] In order to realize the rotational connection between the first connecting rod, the second connecting rod and the corresponding smoke guide blades, the end of each smoke guide blade is provided with a pin shaft extending along the length direction of the smoke guide blade at a position adjacent to its two side edges. The first connecting rod is rotationally connected to the pin shaft located on the same side of each smoke guide blade in the left smoke guide area, and the second connecting rod is rotationally connected to the pin shaft located on the same side of each smoke guide blade in the right smoke guide area.

[0023] Generally speaking, the deflection angle of each smoke guide blade can be adjusted manually, but in order to facilitate user adjustment and improve user experience, it also includes a driving device, the power output end of which is connected to the smoke guide blade, the first connecting rod assembly or the second connecting rod assembly, thereby driving each of the smoke guide blades to deflect.

[0024] The technical solution adopted by the utility model to solve the second technical problem is: a range hood, including a casing and an oil net arranged at the air inlet of the casing, wherein the oil net adopts the above-mentioned oil net device for range hoods.

[0025] The technical solution adopted by the utility model to solve the second technical problem is: a range hood, including a casing and an oil net arranged at the air inlet of the casing, the oil net adopts the above-mentioned oil net device, and the casing is also provided with a detection device for detecting the cooking status on the left and right sides. The detection device and the drive device are electrically connected to the control system of the range hood. The control system of the range hood can control the action of the drive device according to the cooking status signal transmitted by the detection device, thereby driving the smoke guide blades of the oil net device to deflect.

[0026] The above-mentioned detection device can be an infrared temperature sensor for detecting temperature signals on the left and right sides, or an image recognition device for detecting the cooking status on the left and right sides, etc. The above-mentioned flow distribution scheme of the range hood is combined with intelligent recognition (which can be infrared temperature sensing, or image recognition and other technical solutions) to make conditional judgments on the temperature peak value, thereby controlling the flow regulation of the grille oil net. Compared with the traditional single-opening and single-suction flow regulation scheme, it is more intelligent and targeted, and the flow can be flexibly adjusted.

[0027] Compared with the prior art, the advantages of the utility model are as follows: the smoke guide blades in the left smoke guide area and the right smoke guide area are respectively connected by the first connecting rod assembly and the second connecting rod assembly, thereby realizing the deflection angle control of the smoke guide blades in the left and right areas, wherein the first connecting rod assembly and the second connecting rod assembly are arranged in linkage, so that when the smoke guide blades in one of the smoke guide areas are deflected, the smoke guide blades in the other smoke guide area can also be deflected accordingly, thereby making the air volume control of the left and right smoke guide areas have multiple options to meet the needs of different cooking conditions and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the three-dimensional structure of the oil net device of an embodiment of the utility model;

[0029] Figure 2 It is a three-dimensional structural schematic diagram of the oil screen device of the embodiment of the utility model from another angle;

[0030] Figure 3 This is a front view of the oil screen device according to an embodiment of the utility model;

[0031] Figure 4 This is a schematic diagram of the three-dimensional structure of the oil screen device of the utility model embodiment after the fixing frame is omitted;

[0032] Figure 5 It is a vertical cross-sectional view of the oil screen device of the embodiment of the utility model cut along the left and right directions (the smoke guide blade is in the first state);

[0033] Figure 6 It is a vertical cross-sectional view of the oil screen device of the embodiment of the utility model cut along the left and right directions (the smoke guide blade is in the second state);

[0034] Figure 7 It is a vertical cross-sectional view of the oil screen device of the embodiment of the utility model cut along the left and right directions (the smoke guide blade is in the third state);

[0035] Figure 8 It is a schematic diagram of the three-dimensional structure of the range hood according to an embodiment of the utility model. DETAILED DESCRIPTION

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0037] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0038] Figure 1-Figure 8 The oil net device for a range hood and a preferred embodiment of the range hood of the utility model are shown. The range hood includes a housing 40 and a centrifugal fan arranged in the housing 40. The housing 40 generally includes a fan frame 41 and a fume hood 42 arranged at the bottom of the fan frame 41. The inner cavity of the fan frame 41 is connected to the inner cavity of the fume hood 42. Figure 8 A top suction range hood is shown, and an air inlet (not shown) is provided at the bottom of the fume hood 42, through which external smoke can enter the fume hood 42. A centrifugal fan is provided in the fan frame 41, and negative pressure is generated when the centrifugal fan is running, and external oil smoke can be sucked into the fume hood 42 through the air inlet. An oil net device is also provided at the air inlet of the fume hood 42 for filtering oil smoke.

[0039] See also Figure 1-Figure 4The oil net device includes a fixed frame 10 and a plurality of smoke guide blades 30 arranged in the fixed frame 10. The fixed frame 10 is a square frame as a whole, and the smoke guide blades 30 are arranged in sequence along the left and right directions, and each smoke guide blade 30 extends along the left and right directions. The front and rear ends of each smoke guide blade 30 are rotatably connected to the front and rear sides of the fixed frame 10. Specifically, each smoke guide blade 30 has two opposite side edges extending along its length direction. Two adjacent smoke guide blades 30 are set with a suitable spacing in the left and right directions, so that when the two smoke guide blades 30 are deflected to a basically horizontal state, the side edges of the two smoke guide blades 30 can be sealed and contacted, and when in a non-horizontal state, there is a flow channel gap between the two smoke guide blades 30 for smoke to pass through, and the flow channel gap is the smoke inlet flow channel. The deflection angle of the smoke guide blade 30 is different (that is, the inclination direction is different), and the corresponding guide direction of the smoke inlet flow channel is different.

[0040] Continue to see Figure 4 A rotating shaft 34 extending along the length direction is provided at the middle position of both ends of each smoke guide blade 30, and shaft holes for the rotating shaft 34 to be rotatably installed are provided at the front and rear sides of the fixed frame 10. In addition, for universal considerations, a pin 33 extending along the length direction is provided at both ends of each smoke guide blade 30 adjacent to its side edge, and the pin 33 can be used to be rotatably connected with the first connecting rod 21, the second connecting rod 22 and the third connecting rod 23 (detailed description below).

[0041] Adapting to the conventional left and right burners, the fixed frame 10 is divided into a left smoke guide area 11 and a right smoke guide area 12 in the left and right directions, wherein the area of ​​the left smoke guide area 11 and the right smoke guide area 12 is substantially the same. The smoke guide blades 30 located in the left smoke guide area 11 are connected by a first connecting rod assembly, and can deflect together under the drive of the first connecting rod assembly. Specifically, the first connecting rod assembly includes a first connecting rod 21, which extends in the left and right directions and is rotatably connected to the pins 33 located at the same end and the same side of the smoke guide blades 30 in the left smoke guide area 11, that is, the first connecting rod 21 is provided with a plurality of shaft holes for the pins 33 to be rotatably arranged therein at positions corresponding to the smoke guide blades 30 along its length direction. Similarly, the smoke guide blades 30 located in the right smoke guide area 12 are connected by a second connecting rod assembly and can deflect together under the drive of the second connecting rod assembly. Specifically, the second connecting rod assembly includes a second connecting rod 22, which extends in the left-right direction and is rotatably connected to the pin shaft 33 located at the same end and on the same side of the smoke guide blades 30 in the right smoke guide area 12. That is, the second connecting rod 22 has a plurality of axial holes for the pin shaft 33 to rotatably be arranged therein at positions corresponding to the smoke guide blades 30 along its length direction.

[0042] In this embodiment, the first connecting rod assembly is linked with the second connecting rod assembly so that the deflection angle of each smoke guide blade 30 of the left smoke guide area 11 can change with the deflection angle of each smoke guide blade 30 of the right smoke guide area 12. Specifically, the deflection direction of each smoke guide blade 30 of the left smoke guide area 11 is opposite to the deflection direction of each smoke guide blade 30 of the right smoke guide area 12, so that the deflection angle of each smoke guide blade 30 of the left smoke guide area 11 relative to the vertical plane decreases as the deflection angle of each smoke guide blade 30 of the right smoke guide area 12 relative to the vertical plane increases, or the deflection angle of each smoke guide blade 30 of the left smoke guide area 11 relative to the vertical plane increases as the deflection angle of each smoke guide blade 30 of the right smoke guide area 12 relative to the vertical plane decreases. In order to realize the linkage control of each smoke guide blade 30 of the left smoke guide area 11 and each smoke guide blade 30 of the right smoke guide area 12, the two adjacent smoke guide blades 30 of the left smoke guide area 11 and the right smoke guide area 12 are respectively recorded as the first blade 30a and the second blade 30b, wherein the first blade 30a and the second blade 30b both have a first side 31 and a second side 32 opposite to each other, the first connecting rod 21 is rotatably connected to the pin 33 at the end of the first blade 30a adjacent to the first side 31 thereof, and the second connecting rod 22 is rotatably connected to the pin 33 at the end of the second blade 30b adjacent to the first side 31 thereof. The first blade 30a and the second blade 30b are also connected through the third connecting rod 23, specifically, the pin 33 at the end of the first blade 30a adjacent to the second side 32 thereof is rotatably connected to the first end of the third connecting rod 23, and the pin 33 at the end of the second blade 30b adjacent to the second side 32 thereof is rotatably connected to the second end of the third connecting rod 23.

[0043] Considering the need for angle control between the smoke guide blades 30 of the left smoke guide area 11 and the corresponding smoke guide blades 30 of the left smoke guide area 11, the distance between the first blade 30a and the second blade 30b can be reasonably designed according to actual needs. When the distance between the first blade 30a and the second blade 30b is large, one or more corresponding smoke guide blades 30 not participating in the linkage can be set between the two. The smoke guide blades 30 are recorded as third blades 30c. Figure 3 It is shown in FIG. 1 that a third blade 30c is arranged between the two.

[0044] The oil screen device of this embodiment also includes a driving device, which can be a driving motor, and the output shaft of the driving motor is directly or indirectly connected to the rotating shaft 34 of a smoke guide blade 30 of the left smoke guide area 11 (or the right smoke guide area 12), so that when the smoke guide blade is deflected, the other smoke guide blades 30 of the left smoke guide area 11 and the right smoke guide area 12 will also be deflected accordingly. Of course, the driving device can also use other driving mechanisms, connected to the first connecting rod assembly or the second connecting rod assembly, so as to drive each of the smoke guide blades 30 to deflect.

[0045] Driven by the driving device, each smoke guide blade 30 of the left smoke guide area 11 and the right smoke guide area 12 of this embodiment has at least the following states:

[0046] In the first state, the smoke inlet flow channel formed by each smoke guide blade 30 in one of the left smoke guide area 11 and the right smoke guide area 12 is open, and the deflection angle of each smoke guide blade 30 in the smoke guide area relative to the vertical plane is the smallest, and the deflection angle of each smoke guide blade 30 in the other smoke guide area relative to the vertical plane is the largest and overlaps in sequence to close the corresponding smoke inlet flow channel, such as Figure 5 3 shows that the smoke guide blades 30 of the left smoke guide area 11 are folded and closed, while the smoke guide blades 30 of the right smoke guide area 12 are opened and basically arranged vertically, which is suitable for cooking only on the right side.

[0047] In the second state, the smoke inlet flow channels formed by the smoke guide blades 30 in the left smoke guide area 11 and the right smoke guide area 12 are both open, wherein the deflection angle of each smoke guide blade 30 in one smoke guide area relative to the vertical plane is greater than the deflection angle of each smoke guide blade 30 in the other smoke guide area relative to the vertical plane. A small deflection angle of the smoke guide blade 30 relative to the vertical plane means that the deviation angle of the smoke inlet flow channel relative to the vertical plane is small, and the smoke inlet is relatively smooth. A large deflection angle of the smoke guide blade 30 relative to the vertical plane means that the deviation angle of the smoke inlet flow channel relative to the vertical plane is large, and the smoke inlet is relatively unsmooth. Figure 6 It shows that the smoke inlet of the left smoke guide area 11 is not smooth, while the smoke inlet of the right smoke guide area 12 is relatively smooth, that is, the air volume distribution is biased towards the right side, which is suitable for the situation where cooking on the right side is relatively bad.

[0048] In the third state, the smoke inlet flow channels formed by the smoke guide blades 30 in the left smoke guide area 11 and the right smoke guide area 12 are both open, wherein the deflection angle of each smoke guide blade 30 in one smoke guide area relative to the vertical plane is consistent with the deflection angle of each smoke guide blade 30 in the other smoke guide area relative to the vertical plane. Figure 7 The third state is shown, in which the smoke intake conditions of the left smoke guide area 11 and the right smoke guide area 12 are equivalent, that is, the air volume on the left and right sides is evenly distributed, which is suitable for the situation where the cooking conditions on the left and right sides are consistent.

[0049] The housing 40 of the range hood of this embodiment is also provided with a detection device for detecting the cooking status on the left and right sides. The detection device and the driving device are electrically connected to the control system of the range hood. The control system of the range hood can control the driving device to move according to the cooking status signal transmitted by the detection device, thereby driving the smoke guide blades 30 of the oil net device to deflect. The above-mentioned detection device can be an infrared temperature sensor 43 for detecting the temperature signal on the left and right sides or an image recognition device for detecting the cooking status on the left and right sides, etc., see Figure 8, an infrared temperature sensor 43 is provided on the housing 40. The above flow distribution scheme of the range hood cooperates with intelligent recognition (which can be infrared temperature sensing, or image recognition and other technical solutions) to make conditional judgment on the temperature peak, thereby controlling the flow regulation of the grille oil net. Compared with the traditional single-opening and single-suction flow regulation scheme, it is more intelligent and targeted, and the flow can be flexibly adjusted.

[0050] The control method of the oil screen device of the range hood of this embodiment is as follows:

[0051] After the range hood is started, the infrared temperature sensor 43 on the housing 40 detects the temperature field changes of the cooking stove in real time.

[0052] If it is detected that cooking is being done on both sides of the stove area and the temperature difference is lower than the threshold value T1 set by the system, the driving device starts and adjusts the corresponding connecting rod to make the opening angles of the left and right smoke guide blades 30 consistent, ensuring the same suction on the left and right sides.

[0053] If the temperature difference between the two sides of the stove area is detected to be greater than the threshold value T1 set by the system, for example, the temperature on the left side (Ta) is high and the temperature on the right side (Tb) is low, but both temperatures are higher than the threshold value B, it is judged that both sides are cooking, and the cooking condition on the left side is worse, then the corresponding connecting rod is adjusted to increase the air inlet area on the left side and reduce the air inlet area on the right side. Different adjustment angles can be set according to the different temperature difference values ​​on both sides to make the air inlet area ratios on both sides different. For example:

[0054] If Ta>Tb, and Ta-Tb<T1, it is considered that the cooking conditions of the two cooking points are basically the same, and the flow distribution ratio of the two cooking points is 1:1;

[0055] If Ta>Tb, and T1<Ta-Tb<T2, the flow distribution ratio is 2:1;

[0056] If Ta>Tb, and T2<Ta-Tb<T3, the flow distribution ratio is 3:1;

[0057] If the temperature difference between the two sides of the stove area is greater than the threshold T1 set by the system, for example, the temperature on the left side is high and the temperature on the right side is low, and the temperature on the right side is lower than the threshold T min , it is judged that the right stove is closed and the left stove is cooking. At this time, adjust the corresponding connecting rod to close the right air inlet and open the left air inlet to the maximum.

[0058] Among them, T1, T2, and T3 are the temperature difference judgment thresholds set in advance. The thresholds and their corresponding flow distribution ratios can obtain the best values ​​through simulation experiments or prototype experiments, and no specific numerical restrictions are made here. The specific hierarchical division of the temperature difference (i.e., how many judgment conditions are divided into) can also select the most suitable situation according to the technical maturity, calculation time, etc.

[0059] The oil net device of the present embodiment has the smoke guide blades 30 of the left smoke guide area 11 and the right smoke guide area 12 connected by the first connecting rod assembly and the second connecting rod assembly respectively, so as to realize the deflection angle control of the smoke guide blades 30 in the left and right areas, wherein the first connecting rod assembly and the second connecting rod assembly are arranged in linkage, so that when the smoke guide blades 30 in one of the smoke guide areas are deflected, the smoke guide blades 30 in the other smoke guide area can also be deflected accordingly, thereby providing a variety of options for the air volume control of the left and right smoke guide areas, meeting the needs of different cooking conditions, and improving the user experience.

Claims

1. An oil net device for a range hood, comprising: Fixed frame (10); The smoke guide blades (30) are arranged in the fixed frame (10) at intervals in the left-right direction, each of the smoke guide blades (30) extends in the front-back direction, and the front and rear ends of each smoke guide blade (30) are rotatably connected to the front and rear sides of the fixed frame (10), and two adjacent smoke guide blades (30) form a smoke inlet channel; The invention is characterized in that: the fixed frame (10) is divided into a left smoke guide area (11) and a right smoke guide area (12) in the left and right directions; the smoke guide blades (30) located in the left smoke guide area (11) are connected by a first connecting rod assembly and can be deflected together under the drive of the first connecting rod assembly; the smoke guide blades (30) located in the right smoke guide area (12) are connected by a second connecting rod assembly and can be deflected together under the drive of the second connecting rod assembly; the first connecting rod assembly and the second connecting rod assembly are linked so that the deflection angle of the smoke guide blades (30) in the left smoke guide area (11) can change with the change of the deflection angle of the smoke guide blades (30) in the right smoke guide area (12).

2. The oil screen device for a range hood according to claim 1, characterized in that: The deflection direction of each smoke guide blade (30) of the left smoke guide zone (11) is opposite to the deflection direction of each smoke guide blade (30) of the right smoke guide zone (12), so that the deflection angle of each smoke guide blade (30) of the left smoke guide zone (11) relative to the vertical plane decreases as the deflection angle of each smoke guide blade (30) of the right smoke guide zone (12) relative to the vertical plane increases, or the deflection angle of each smoke guide blade (30) of the left smoke guide zone (11) relative to the vertical plane increases as the deflection angle of each smoke guide blade (30) of the right smoke guide zone (12) relative to the vertical plane decreases.

3. The oil screen device for a range hood according to claim 2, characterized in that: The first connecting rod assembly and the second connecting rod assembly are linked to each other so that each smoke guide blade (30) of the left smoke guide area (11) and the right smoke guide area (12) has at least the following state: In a first state, the smoke inlet flow channel formed by the smoke guide blades (30) in one of the left smoke guide area (11) and the right smoke guide area (12) is open, and the deflection angle of the smoke guide blades (30) in the smoke guide area relative to the vertical plane is the smallest, while the deflection angle of the smoke guide blades (30) in the other smoke guide area relative to the vertical plane is the largest and they overlap in sequence to close the corresponding smoke inlet flow channel; In the second state, the smoke inlet flow channels formed by the smoke guide blades (30) in the left smoke guide area (11) and the right smoke guide area (12) are both open, wherein the deflection angle of the smoke guide blades (30) in one smoke guide area relative to the vertical plane is greater than the deflection angle of the smoke guide blades (30) in the other smoke guide area relative to the vertical plane; In the third state, the smoke inlet flow channels formed by the smoke guide blades (30) in the left smoke guide area (11) and the right smoke guide area (12) are both open, wherein the deflection angle of the smoke guide blades (30) in one smoke guide area relative to the vertical plane is consistent with the deflection angle of the smoke guide blades (30) in the other smoke guide area relative to the vertical plane.

4. The oil screen device for a range hood according to claim 3, characterized in that: In the above-mentioned first state, each smoke guiding blade (30) in the smoke guiding area of ​​the open smoke inlet channel extends vertically.

5. The oil screen device for a range hood according to claim 3, characterized in that: In the third state, the inclination direction of each smoke guide blade (30) in the left smoke guide zone (11) is opposite to the inclination direction of each smoke guide blade (30) in the right smoke guide zone (12).

6. The oil screen device for a range hood according to any one of claims 1 to 5, characterized in that: The first connecting rod assembly includes a first connecting rod (21) extending in the left-right direction, and the ends of each smoke guide blade (30) located in the left smoke guide area (11) are rotatably connected to different positions in the length direction of the first connecting rod (21) at a position deviating from its rotation axis. The second connecting rod assembly includes a second connecting rod (22) extending in the left-right direction, and the ends of each smoke guide blade (30) located in the left smoke guide area (11) are rotatably connected to different positions in the length direction of the second connecting rod (22) at a position deviating from its rotation axis.

7. The oil screen device for a range hood according to claim 6, characterized in that: Each of the smoke guide blades (30) has two opposite side edges, and the position where the first connecting rod (21) is connected to the end of each smoke guide blade (30) of the left smoke guide area (11) is adjacent to the side edge of the corresponding smoke guide blade (30), and the position where the second connecting rod (22) is connected to the end of each smoke guide blade (30) of the right smoke guide area (12) is adjacent to the side edge of the corresponding smoke guide blade (30).

8. The oil screen device for a range hood according to claim 7, characterized in that: The two adjacent smoke guide blades (30) of the left smoke guide area (11) and the right smoke guide area (12) are respectively recorded as a first blade (30a) and a second blade (30b); the first blade (30a) and the second blade (30b) both have a first side edge (31) and a second side edge (32) opposite to each other; the first connecting rod (21) is rotatably connected to the end of the first blade (30a) at a position adjacent to the first side edge (31); the second connecting rod (22) is rotatably connected to the end of the second blade (30b) at a position adjacent to the first side edge (31); the first blade (30a) and the second blade (30b) are also connected via a third connecting rod (23); the end of the first blade (30a) at a position adjacent to the second side edge (32) is rotatably connected to the first end of the third connecting rod (23); the end of the second blade (30b) at a position adjacent to the second side edge (32) is rotatably connected to the second end of the third connecting rod (23).

9. The oil screen device for a range hood according to claim 7, characterized in that: The ends of each of the smoke guide blades (30) are provided with a pin shaft (33) extending along the length direction of the smoke guide blade (30) at positions adjacent to the two side edges thereof; the first connecting rod (21) is rotatably connected to the pin shaft (33) located on the same side of each of the smoke guide blades (30) in the left smoke guide area (11); and the second connecting rod (22) is rotatably connected to the pin shaft (33) located on the same side of each of the smoke guide blades (30) in the right smoke guide area (12).

10. The oil screen device for a range hood according to claim 1, characterized in that: It also comprises a driving device, the power output end of which is connected to the smoke guide blades (30), the first connecting rod assembly or the second connecting rod assembly, thereby driving each of the smoke guide blades (30) to deflect.

11. A range hood, comprising a housing (40) and an oil net arranged at an air inlet of the housing (40), wherein the oil net is the oil net device for a range hood according to any one of claims 1 to 9.

12. A range hood, comprising a casing (40) and an oil net arranged at the air inlet of the casing (40), wherein the oil net adopts the oil net device for range hoods as described in claim 10, and the casing (40) is also provided with a detection device for detecting the cooking status on the left and right sides, the detection device and the drive device are both electrically connected to the control system of the range hood, and the control system of the range hood can control the action of the drive device according to the cooking status signal transmitted by the detection device, thereby driving the smoke guide blades (30) of the oil net device to deflect.

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