Air inlet plate for range hood and range hood

Abstract

The air inlet plate is used for being installed on the front portion of an exhaust fume collecting hood of the extractor hood, an air inlet is formed in the air inlet plate and extends in the left-right direction of the air inlet plate, and the air inlet area of the air inlet is gradually increased from the left end to the right end to the middle area. And the upper edge of the air inlet is constructed to be inclined upwards from the left end and the right end to the middle position, so that an inverted V-shaped structure is formed. The thin range hood has the advantages that through the collaborative design of the inverted-V-shaped upper edge of the air inlet and the increase of the air inlet area in the middle, the problems that the suction force in the middle of an air inlet of an existing thin range hood is weak and is easily hindered by a physical structure are solved, the air inlet efficiency distribution is remarkably optimized, the oil smoke escape rate is effectively reduced, and the overall suction and exhaust efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to an air inlet plate for a range hood and the range hood. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. Due to kitchen space limitations, a thin range hood with a small front-to-back depth has emerged. This hood includes a fume hood with an air vent plate and a smoke shield that can be pivoted relative to the air vent plate. The air vent plate has an air inlet. The back-and-forth pivoting of the smoke shield can shield the air vent plate, hiding it or exposing it. When the air vent plate is exposed, external fumes can enter the fume hood through the air inlet. However, existing range hoods still suffer from poor overall suction and exhaust performance due to uneven distribution of suction pressure generated by the fan system at the air inlet.

[0003] In order to solve the above technical problems, the Chinese utility model patent with authorization announcement number CN220152809U discloses an air outlet plate and a range hood, which includes a casing, the casing is formed with a smoke collecting chamber and is provided with a mounting port connected to the smoke collecting chamber, the air outlet plate is connected to the casing and sealed at the mounting port; an air inlet for connecting to the smoke collecting chamber is provided on the air outlet plate, and the air inlet is used to allow external oil smoke to pass through and enter the smoke collecting chamber; the air inlet extends along the left and right directions of the air outlet plate, and in the up and down directions, the size of the air inlet located in the middle of the air outlet plate is smaller than the size of the air inlet located at the left and right ends of the air outlet plate.

[0004] However, the air vent plate in the above patent still has certain shortcomings: the upper edge of the air inlet of the air vent plate in the above patent is gradually inclined downward from the left and right ends to the middle. For this air inlet structure, a downward-extending oil guide plate needs to be set in the middle position to facilitate guiding the oil downward. The setting of the oil guide plate will inevitably lead to the obstruction of the air intake in the middle area of the air inlet, and an effective capture cyclone cannot be formed, which weakens the effect of the oil smoke gathering to the middle. In particular, when a large amount of oil smoke rises, there is a situation where the smoke cannot be captured in time by the air inlet and escapes. Utility Model Content

[0005] The first technical problem to be solved by the present invention is to provide an air inlet plate for a range hood that can effectively reduce the escape of oil smoke in response to the current status of the existing technology.

[0006] The second technical problem to be solved by the present invention is to provide a range hood using the above-mentioned air inlet plate in view of the current status of the existing technology.

[0007] The technical solution adopted by the present invention to solve the first technical problem is as follows: an air inlet plate for a range hood, which is mounted on the front portion of the range hood, the air inlet plate having an air inlet extending in the left-right direction of the air inlet plate. The air inlet area of the air inlet gradually increases from the left and right ends to the middle region, and the upper edge of the air inlet is constructed to tilt upward from the left and right ends to the middle position, thereby forming an inverted V-shaped structure. To prevent oil on the back of the air inlet plate from dripping directly onto the upper edge of the air inlet, the upper edge of the air inlet further comprises a first oil guide flange that folds backward and extends. To smoothly guide the oil on the back of the air inlet plate to both sides and to the bottom, the air inlet further comprises left and right opposing side edges, both of which extend vertically and have second oil guide flanges that fold backward and extend, with the left and right ends of the first oil guide flange connected to the tops of the left and right second oil guide flanges.

[0008] The portion of the upper edge of the above-mentioned air inlet that extends upward in an inclined manner may be an edge structure consisting of a straight line, or an edge structure consisting of at least two straight lines (with different inclination angles) connected in sequence, or an edge structure consisting of one or more curved lines, etc., as long as it has an overall tendency to "incline upward from the left end (or right end) to the middle position".

[0009] The "inverted V-shaped structure" of the upper edge of the above-mentioned air inlet is not limited to the direct intersection of the tops of the two left and right inclined sections of the upper edge to form a corresponding angle, but can also be: the tops of the two left and right inclined sections are connected by a horizontally extending straight edge or curved edge.

[0010] This application solves the problem of weak suction in the middle of the existing thin range hood air inlet and susceptibility to physical structure obstruction through the coordinated design of the "inverted V-shaped upper edge" and "increased air inlet area in the middle" of the air inlet, significantly optimizes the air intake efficiency distribution, especially strengthens the negative pressure and cyclone intensity in the core area of the oil fume, and eliminates the interference of the middle oil guide plate on the airflow, thereby achieving maximum suction in the central area where the oil fume is most intensely generated and needs to be captured most efficiently, ultimately effectively reducing the oil fume escape rate and improving the overall suction and exhaust efficiency.

[0011] Taking into account the inclination angle of the upper edge of the air inlet relative to the horizontal direction, if the angle is too small (<5°), it may not be able to effectively guide the oil, while if it is too large (≥60°), it may cause the structure to be abrupt and take up space, and it may not be able to effectively gather the oil smoke. Therefore, the value range of the above-mentioned inclination angle should be reasonably designed. The inclination angle of the upper edge of the air inlet relative to the horizontal direction is recorded as α, where the value range of α is: 5°≤α<60°.

[0012] Considering that the asymmetric design of the air inlet may lead to uneven suction on both sides, affect the uniformity of oil fume capture, and greatly affect the appearance of the range hood (when in use, the air inlet plate is visible from the outside), the upper edge of the air inlet is arranged symmetrically in the left and right directions.

[0013] To prevent oil from stagnating at the junction of the two oil-guiding flanges, the left and right ends of the first oil-guiding flange and the tops of the left and right second oil-guiding flanges are each designed with a smooth, arc-shaped structure. This arc-shaped connection eliminates dead spots, improves oil flow, and facilitates cleaning.

[0014] In order to maximize the air inlet area of the air inlet and facilitate the installation of the bottom of the air inlet plate (usually provided with a guide plate to avoid interference problems), the air inlet is a non-enclosed opening that passes through the lower edge of the air inlet plate.

[0015] The above-mentioned "non-enclosed opening" can be understood as the lower part of the air inlet being connected to the lower edge of the air inlet plate to form an open channel, that is, the air inlet extends downward to the bottom edge of the air inlet plate, forming a "U-shaped" gap.

[0016] Considering the limited front-to-back dimensions of thin range hoods, to further reduce fume escape, the front side of the air inlet plate has a partially rearwardly recessed smoke buffer chamber. The left-right dimensions of at least the upper region of the smoke buffer chamber gradually decrease from bottom to top. At least a portion of the air inlet is positioned below the region where the smoke buffer chamber resides. An auxiliary air intake is also provided above the region where the smoke buffer chamber resides on the air inlet plate. When a large amount of fume rises quickly during cooking, it may not be possible to immediately inhale all of it. In this case, some fume can enter the region where the smoke buffer chamber resides and be drawn in and discharged through the upper auxiliary air intake, effectively preventing fume escape caused by the inability to be promptly drawn in and discharged by the lower air inlet.

[0017] To further enhance the efficiency of the auxiliary air intakes on the upper portion of the air inlet plate, at least two auxiliary air intakes are positioned sequentially along the left and right sides of the plate. Each auxiliary air intake is a strip-shaped opening extending in that direction. The auxiliary air intakes, spaced apart and arranged as strips extending in that direction, also allow for more rapid capture of oil fumes that are not readily absorbed and discharged by the lower air inlet.

[0018] The technical solution adopted by the present invention to solve the second technical problem is: a range hood, comprising a fume hood and a panel connected to the front top of the fume hood so as to be rotatable forward and backward, the front opening of the fume hood being provided with the above-mentioned air inlet plate, the panel having at least a first state and a second state as its rotational position changes:

[0019] In the first state, the panel covers the front of the smoke hood, and the lower edge of the panel extends to the bottom of the smoke hood, thereby shielding the air inlet plate;

[0020] In the second state, the panel is deflected forward relative to the smoke collecting hood and opened, thereby exposing the air inlet.

[0021] The panel is a single, large unit, with the opening and closing mechanism located at the top of the hood, rather than in the middle. This design effectively avoids the fume leakage that would otherwise occur when the panel is opened and closed in the middle, and also maintains the flow of fume intake. The large panel also effectively collects fumes when open, minimizing their escape.

[0022] Compared with the prior art, the advantages of the present invention are as follows: the upper edge of the air inlet of the air inlet plate of the present invention is inclined upward from the two ends to the middle (inverted V shape), and the structure in which the air inlet area gradually increases from the two ends to the middle increases the opening height and area of the middle area of the air inlet synchronously, which greatly improves the air intake flux in this area and significantly enhances the suction intensity of the fan system in the core area where the oil smoke rises most concentratedly (corresponding to the top of the stove). At the same time, since the upper edge of the air inlet is gradually inclined upward from the two sides to the middle, the airflow gradually gathers towards the middle during the process of being sucked into the air inlet. In particular, since the air inlet area of the air inlet becomes larger and larger from the two sides to the middle, according to the Bernoulli principle, the pressure is lower where the air flow velocity is faster, and the airflow on the upper sides of the left and right areas of the air inlet will also gather towards the middle. At this time, the airflow in front of the air inlet can form a rotating capture cyclone, which actively draws the diffusing oil smoke into the cavity, overcoming the problem of insufficient suction caused by wind resistance or obstruction of the oil guide plate in the traditional small middle opening, and preventing oil smoke from escaping from both sides. On the other hand, in the preferred embodiment, the air inlet plate of the present application utilizes the inverted V-shaped upper edge structure itself in conjunction with the oil guide flange to guide the oil along the trend, and the condensed oil droplets can slide down to the left and right sides along the inclined surface, which effectively avoids the need for additional downward extending oil guide plates in the middle area of the air inlet for oil guidance in the prior art. After removing this physical obstacle, the air inlet in the key central area is unobstructed, and the airflow can enter smoothly, concentratedly and at high speed, maximizing the utilization of the air inlet area of the area, effectively improving the instantaneous smoke capture efficiency and optimizing the airflow path. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the air inlet plate of an embodiment of the utility model;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the air inlet plate of an embodiment of the utility model from another angle;

[0025] Figure 3 This is a front view of the air inlet plate of an embodiment of the utility model;

[0026] Figure 4 for Figure 3 A cross-sectional view of the air inlet plate taken along AA;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the range hood according to an embodiment of the present invention, with the panel in a closed state;

[0028] Figure 6 A vertical cross-sectional view of the range hood according to an embodiment of the present invention taken along the front-to-back direction;

[0029] Figure 7 This is a schematic diagram of the three-dimensional structure of the range hood according to the embodiment of the utility model after omitting components such as the panel;

[0030] Figure 8 This is a schematic diagram of the three-dimensional structure of the range hood according to an embodiment of the present invention, in which the panel is in a forward-deflected and open state. DETAILED DESCRIPTION

[0031] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0032] In the specification and claims of the present invention, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0033] Figures 1-8A preferred embodiment of the range hood and air inlet plate of the present invention is shown. The range hood includes a housing and a fan system 11 disposed within the housing. The fan system 11 typically employs a centrifugal fan. The housing typically includes a fan frame 10 and a fume hood 20 disposed at the bottom of the fan frame 10. The interior of the fan frame 10 communicates with the interior of the fume hood 20. An air inlet 31 is provided on the front sidewall of the fume hood 20, through which external fumes can enter the fume hood 20. The centrifugal fan is disposed within the fan frame 10. When the centrifugal fan is in operation, it generates negative pressure, allowing external fumes to be drawn into the fume hood 20 through the air inlet 31. An oil cup (not shown in the accompanying drawings) is provided at the bottom of the fume hood 20. The oil cup is a long strip extending from side to side, and is used to collect grease that flows down from the fume hood 20. The front portion of the smoke hood 20 is further provided with a panel 50 that can be pivoted forward and backward relative to the smoke hood 20. The panel 50 is connected to the main body of the smoke hood 20 via a hinge mechanism. Specifically, the panel 50 can be pivoted forward to open the air inlet 31 and pivoted backward to block and close the air inlet 31. The hinge mechanism for pivoting the smoke shield can be a conventional hinge mechanism known in the art and will not be described further herein.

[0034] See also Figure 7 In this embodiment, the front and rear depths of the smoke hood 20 are basically the same, that is, when the panel 50 is in the covered state, the smoke hood 20 is basically a flat box extending vertically. The air inlet chamber defined in the smoke hood 20 is also basically a chamber structure extending vertically. The left and right dimensions of the smoke hood 20 are larger than the left and right dimensions of the fan frame 10. Therefore, the left and right sides of the smoke hood 20 have shoulders protruding to the left or right respectively relative to the fan frame 10. A connection port is provided at the top of the smoke hood 20 that communicates with the bottom of the fan frame 10, so that the vertical air inlet chamber formed inside the smoke hood 20 is connected to the inner cavity of the fan frame 10.

[0035] See also Figure 1-Figure 4 as well as Figure 7 An air inlet plate 30 is located at the front opening of the fume hood 20. This plate 30 forms the front sidewall of the fume hood 20. Together with the left and right sidewalls and the rear wall of the fume hood, the plate 30 defines a vertically extending air inlet chamber 21. The plate 30 includes an air inlet port 31 at the bottom and an auxiliary air intake port 32 at the top, providing omnidirectional, vertical suction and exhaust of cooking fumes.

[0036] The panel 50 of this embodiment basically deflects forward and backward with its top edge (or a horizontal axis parallel to its top edge) as the rotation axis. Specifically, the panel 50 has at least a first state and a second state as its rotational position relative to the smoke hood changes: in the first state, the panel 50 covers the front of the smoke hood 20 and is basically in a vertical extension state, and the upper edge of the panel 50 is basically flush with the top of the smoke hood 20, while the lower edge extends to the bottom of the smoke hood 20, thereby blocking the air inlet 31 and the auxiliary air intake 32 together. Generally speaking, an oil cup is usually provided at the bottom of the smoke hood 20. The panel 50 may or may not block the oil cup, but the lower edge of the panel 50 extends at least to the position of the oil cup of the smoke hood 20, thereby completely blocking the air inlet plate 30. In the second state, the panel 50 is deflected forward relative to the smoke hood 20 and opened, thereby exposing the air inlet plate 30. Of course, the air inlet 31 and the auxiliary air suction port 32 on the air inlet plate 30 are also exposed to absorb and exhaust oil smoke. The panel 50 of this embodiment adopts a whole glass panel, wherein the hinge movement mechanism for driving the opening and closing of the panel 50 is at the top of the smoke hood 20 rather than the middle area. This design effectively avoids the oil smoke leakage problem caused by being set in the middle area, and will not affect the suction of oil smoke, that is, the smoothness of the flow field. In addition, the panel 50 of this embodiment adopts a large panel design, which can also effectively gather oil smoke when it is open, reducing escape.

[0037] In some embodiments, a partial area of the front side of the air inlet plate 30 is recessed backward to form a smoke buffer chamber 33. Figure 1 As shown, a section of the lower portion of the smoke buffer chamber 33 of the air inlet plate 30 is essentially rectangular, meaning that the left and right dimensions of this section are essentially the same. The lower portion of the smoke buffer chamber 33 extends left and right to the left and right edges of the air inlet plate 30. Correspondingly, the air inlet 31 at the lower portion of the air inlet plate 30 extends left and right, with a portion of the air inlet 31 also occupying the lower portion of the smoke buffer chamber 33. Furthermore, the two opposing side edges 312 of the air inlet 31 also extend essentially vertically and are adjacent to the left and right edges of the lower portion of the smoke buffer chamber 33. The upper portion of the smoke buffer chamber 33 resembles an isosceles trapezoid, meaning that the left and right dimensions of the upper portion of the smoke buffer chamber 33 gradually decrease from bottom to top, forming an inverted V-shaped smoke buffer space. The upper portion of the air inlet 31 on the air inlet plate 30 is located in the upper area of the smoke buffer chamber 33 , and the auxiliary air inlet 32 of the air inlet plate 30 is also located in the upper area of the smoke buffer chamber 33 and above the air inlet 31 .

[0038] In some embodiments, two auxiliary air intakes 32 are spaced apart, each extending in a strip-shaped pattern. These two auxiliary air intakes 32 correspond to the dual cooking zones, enhancing the efficiency of collecting top fume. During cooking, large amounts of rising fume can be temporarily stored in the fume buffer chamber 33. Fumes that are not drawn in or out by the air inlet 31 are guided toward the auxiliary air intakes 32 by the flue gas buffer chamber 33's tapering structure, where they are drawn in through the upper auxiliary air intake 32, preventing them from escaping.

[0039] The top edge 300 and left and right edges 301 of the air inlet plate 30 protrude forward relative to the main body of the air inlet plate 30, providing support when closed with the panel 50. This forward-protruding design of the top edge 300 and left and right edges 301 of the air inlet plate 30 also causes the main body of the air inlet plate 30 to be relatively concave, forming a secondary buffer chamber 34 that enhances the buffering effect of oil smoke.

[0040] The air inlet area of the air inlet 31 of the air inlet plate 30 of this embodiment gradually increases from the left and right ends to the middle area, and the upper edge 310 of the air inlet 31 is constructed to be inclined upward from the left and right ends to the middle position, thereby forming an inverted V-shaped structure. Among them, the portion of the upper edge 310 of the above-mentioned air inlet 31 that extends upward in an inclined manner can be an edge structure composed of a straight line, or an edge structure composed of at least two straight lines (with different inclination angles) connected in sequence, or an edge structure composed of one or more curved lines, etc., as long as it has a tendency of "inclined upward from the left end (or right end) to the middle position" as a whole. In addition, the "inverted V-shaped structure" of the above-mentioned air inlet 31 can refer to the tops of the two inclined left and right sections of the upper edge 310 directly intersecting to form a corresponding angle, such as Figure 1 The upper edge 310 shown in FIG may also be: the tops of the two inclined sections are connected by a horizontally extending straight edge or a curved edge.

[0041] See also Figure 3 The inclination angle formed by the upper edge 310 of the air inlet 31 relative to the horizontal direction should be reasonably designed. For example, if the angle is too small (<5°), the oil may not be effectively diverted, while if the angle is too large (≥60°), the structure may become abrupt and occupy space, and it may not effectively gather the oil smoke. For this reason, in some embodiments, the value range of the inclination angle formed by the upper edge 310 of the air inlet 31 relative to the horizontal direction should be reasonably designed. Specifically, the inclination angle of the upper edge 310 of the air inlet 31 relative to the horizontal direction is recorded as α, where the value range of α is: 5°≤α<60°, preferably, α=10°.

[0042] The upper edge 310 of the air inlet 31 of the air inlet plate 30 of this embodiment is inclined upward from both ends to the middle (inverted V shape), and the structure in which the air inlet area gradually increases from both ends to the middle causes the opening height and area of the middle region of the air inlet 31 to increase synchronously, which greatly improves the air inlet flux in this region and significantly enhances the suction intensity of the fan system 11 in the core region (corresponding to the top of the stove) where the oil smoke is most concentrated. At the same time, since the upper edge of the air inlet 31 gradually inclines upward from both sides to the middle, the airflow gradually gathers toward the middle during the process of being sucked into the air inlet 31. In particular, since the air inlet area of the air inlet 31 becomes larger and larger from both sides to the middle, according to Bernoulli's principle, the pressure is smaller where the air flow velocity is faster, and the airflow on the upper side of the left and right regions of the air inlet 31 will also gather toward the middle. At this time, the airflow in front of the air inlet 31 can form a rotating capture cyclone (such as Figure 7 The diffused oil smoke roll is actively sucked into the cavity, overcoming the problem of insufficient suction caused by wind resistance or oil guide plate obstruction in the traditional small middle opening, and preventing the oil smoke from escaping from both sides.

[0043] In some embodiments, the upper edge 310 of the air inlet 31 further includes a first oil-guiding flange 311 that folds backward and extends. This flange 311, like the upper edge 310 of the air inlet 31, is also roughly shaped like an inverted V. To smoothly guide the oil from both sides to the bottom, the left and right side edges 312 of the air inlet 31 each include a second oil-guiding flange 313 that folds backward and extends. The left and right ends of the first oil-guiding flange 311 connect with the tops of the left and right second oil-guiding flanges 313. This allows oil on the back of the air inlet plate 30 to be directed to the left and right sides via the first oil-guiding flange 311 and then downward via the second oil-guiding flange 313 to the oil cup at the bottom, thereby preventing oil on the back of the air inlet plate 30 from dripping directly onto the upper edge 310 of the air inlet 31.

[0044] The air inlet plate 30 utilizes the inverted V-shaped upper edge 310 structure itself in conjunction with the above-mentioned first oil-guiding flange 311 to guide oil along the trend, and condensed oil droplets can slide to the left and right sides along the inclined surface. This effectively avoids the need for an additional downward-extending oil guide plate in the middle area of the air inlet 31 for oil guidance in the prior art. After removing this physical obstacle (oil guide plate), the air intake in the key area in the middle of the air inlet 31 is unobstructed, and the airflow can enter smoothly, concentratedly and at high speed, maximizing the utilization of the air intake area of this area, effectively improving the instantaneous smoke capture efficiency, and optimizing the airflow path.

[0045] Of course, in some embodiments, to prevent oil from stagnating at the junction of the two oil-guiding flanges (i.e., the first oil-guiding flange 311 and the second oil-guiding flange 313), the portions where the left and right ends of the first oil-guiding flange 311 connect with the tops of the left and right second oil-guiding flanges 313 are each constructed as a smoothly transitioned arc-shaped structure. The arc-shaped connection between the two oil-guiding flanges eliminates dead angles, improves oil flow, and facilitates cleaning.

[0046] See also Figure 6 and Figure 7 In this embodiment, the smoke hood 20 is further provided with a deflector 40 at the air inlet 31. The bottom edge of the deflector 40 is connected to the bottom of the smoke hood 20 and corresponds to the air inlet 31 at the lower portion of the air inlet plate 30. The deflector 40 extends upward and rearward as a whole, guiding the airflow at the air inlet 31 to smoothly enter the chamber and reduce inlet turbulence noise.

[0047] See also Figure 1 To facilitate installation of the deflector plate 40 (primarily to avoid interference), the air inlet 31 on the air inlet plate 30 of this embodiment is an open opening extending through the lower edge of the air inlet plate 30. "Open opening" means that the lower portion of the air inlet 31 communicates with the lower edge of the air inlet plate 30, forming an open channel. In other words, the air inlet 31 extends downward to the bottom edge of the air inlet plate 30, forming a "U-shaped" gap.

Claims

1. An air inlet plate for a range hood, for installation at the front of a smoke collecting hood (20) of the range hood, the air inlet plate (30) being provided with an air inlet (31), characterized in that: The air inlet (31) is arranged to extend in the left-right direction of the air inlet plate (30), and the air inlet area of the air inlet (31) gradually increases from the left and right ends to the middle area, and the upper edge (310) of the air inlet (31) is constructed to be inclined upward from the left and right ends to the middle position, thereby forming an inverted V-shaped structure; The upper edge (310) of the air inlet (31) further comprises a first oil-guiding flange (311) that is folded and extended backward. The air inlet (31) further comprises left and right opposite side edges (312), both of the side edges (312) extend vertically and both have a second oil-guiding flange (313) folded and extended backward, and the left and right ends of the first oil-guiding flange (311) are connected to the tops of the left and right second oil-guiding flanges (313).

2. The air inlet plate for a range hood according to claim 1, characterized in that: The inclination angle of the upper edge (310) of the air inlet (31) relative to the horizontal direction is recorded as α, wherein the value range of α is: 5°≤α<60°.

3. The air inlet plate for a range hood according to claim 2, characterized in that: The upper edges (310) of the air inlets (31) are symmetrically arranged in the left-right direction.

4. The air inlet plate for a range hood according to claim 1, characterized in that: The corresponding connecting portions of the left and right ends of the first oil-guiding flange (311) and the tops of the left and right second oil-guiding flanges (313) are both constructed as arc-shaped structures with smooth transitions.

5. The air inlet plate for a range hood according to any one of claims 1 to 4, characterized in that: The air inlet (31) is a non-enclosed opening extending through the lower edge of the air inlet plate (30).

6. The air inlet plate for a range hood according to any one of claims 1 to 4, characterized in that: The front side surface of the air inlet plate (30) is provided with a smoke buffer chamber (33) which is partially recessed backwards, and the left and right dimensions of at least the upper area of the smoke buffer chamber (33) gradually decrease from bottom to top. At least part of the air inlet (31) is arranged at the lower part of the area where the smoke buffer chamber (33) is located, and an auxiliary air suction port (32) is also provided at the upper part of the area where the smoke buffer chamber (33) is located on the air inlet plate (30).

7. The air inlet plate for a range hood according to claim 6, characterized in that: There are at least two auxiliary air suction ports (32) arranged in sequence along the left-right direction, and each auxiliary air suction port (32) is a strip-shaped port extending along the left-right direction.

8. A range hood comprising a fume hood (20) and a panel (50) connected to the top of the front side of the fume hood (20) so as to be rotatable forward and backward, characterized in that: An air inlet plate (30) is provided at the front opening of the smoke collecting hood (20), and the air inlet plate (30) is an air inlet plate for a range hood according to any one of claims 1 to 7. The panel (50) has at least a first state and a second state as its rotation position changes: In the first state, the panel (50) covers the front of the smoke collecting hood (20), and the lower edge of the panel (50) extends to the bottom of the smoke collecting hood (20), thereby shielding the air inlet plate (30); In the second state, the panel (50) is deflected forward relative to the smoke collecting hood (20) and opened, thereby exposing the air inlet (31).

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