Range hood

Abstract

The present application relates to the technical field of range hood, and particularly relates to a range hood. The range hood comprises a smoke collecting hood, and a first air inlet and two second air inlets are arranged side by side along the length direction of the lower part of the front side plate of the smoke collecting hood, and the first air inlet is located between the two second air inlets. Along the height direction of the smoke collecting hood, the bottom wall of the first air inlet is higher than the bottom wall of the second air inlet, so as to form a non-air inlet area between the two second air inlets. Three air inlets are arranged along the length direction of the front side plate of the smoke collecting hood, and the first air inlet is located between the two second air inlets. The oil fume rises to the upper middle part of the smoke collecting hood and is sucked through the first air inlet. The non-air inlet area forms a negative pressure environment in the corresponding smoke collecting cavity area of the smoke collecting hood, and the smoke suction amount of the two second air inlets is increased. By arranging the above three air inlets in the lower part of the smoke collecting hood, the smoke suction efficiency of the range hood is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of range hood, in particular to a range hood. BACKGROUND

[0002] The range hood is a device for sucking and exhausting the oil fume generated in the cooking process, and has gradually become an essential household appliance for purifying the kitchen environment.

[0003] The front side of the smoke collecting cover of the range hood is generally provided with a lower air inlet. Since the middle position of the lower air inlet is on the main air inlet flow path of the fan assembly, the oil fume generated by the burners on the left and right sides below the range hood inevitably rises to the upper middle position of the lower air inlet. However, the existing lower air inlet structure is single, mostly in the form of a long slot or a straight slot, which cannot form effective targeted smoke suction, thereby limiting the smoke suction efficiency of the range hood. SUMMARY

[0004] One of the technical problems solved by the present application is to provide a range hood which can effectively solve the technical problem of low smoke suction efficiency caused by the single structure of the air inlet of the range hood in the prior art.

[0005] The above technical problem is solved by the following technical scheme:

[0006] The range hood comprises a smoke collecting cover, and a first air inlet and two second air inlets are arranged side by side in the length direction of the lower part of the front side plate of the smoke collecting cover, and the first air inlet is located between the two second air inlets. In the height direction of the smoke collecting cover, the bottom wall of the first air inlet is higher than the bottom wall of the second air inlet, so as to form a non-air inlet area between the two second air inlets.

[0007] The range hood according to the present application has the following beneficial effects compared with the background art:

[0008] Three air inlets are arranged in the length direction of the front side plate of the smoke collecting cover, and the first air inlet is located between the two second air inlets. In the height direction of the smoke collecting cover, the bottom wall of the first air inlet is higher than the bottom wall of the second air inlet, so that the oil fume generated by the burners below the smoke collecting cover rises to the upper middle position of the smoke collecting cover and is sucked through the first air inlet. The non-air inlet area below the first air inlet is a solid non-hole part of the front side plate, so that the non-air inlet area forms a negative pressure environment in the corresponding smoke collecting cavity area in the smoke collecting cover, increases the smoke suction amount of the two second air inlets on both sides of the non-air inlet area, and makes the oil fume generated by the burners on the left and right sides distributed to the corresponding second air inlets respectively. By arranging the above three air inlets in the lower part of the smoke collecting cover, the smoke suction efficiency of the range hood is improved.

[0009] In one of the embodiments, the length of the first air inlet gradually decreases from top to bottom along the height direction of the fume hood, and the second air inlet is arranged to be inclined towards the first air inlet from top to bottom.

[0010] In one of the embodiments, the second side wall of the second air inlet close to the first air inlet comprises a first section and a second section connected at an angle;

[0011] The first section is arranged to be inclined towards the first air inlet from top to bottom along the height direction of the fume hood and extends to the height of the bottom wall of the first air inlet, and the second section is arranged to be inclined towards the non-air inlet area from bottom to top along the height direction of the fume hood and extends to the height of the top of the non-air inlet area.

[0012] In one of the embodiments, the area of the first air inlet is S1, the sum of the areas of the first air inlet and the two second air inlets is S, and 0.1≤S1 / S≤0.2;

[0013] And / or, along the height direction of the fume hood, the height of the second air inlet is H, and the height of the non-air inlet area is h, and 1 / 3≤h / H≤2 / 3.

[0014] In one of the embodiments, the fume hood comprises:

[0015] An air inlet plate, the first air inlet and the two second air inlets are arranged on the air inlet plate, and the air inlet plate is arranged to be inclined towards the inside of the fume hood from top to bottom along the height direction of the fume hood;

[0016] An oil guide plate, the oil guide plate is arranged to be inclined towards the inside of the fume hood from bottom to top along the height direction of the fume hood and at an angle with the air inlet plate, and the top end of the oil guide plate is connected to the bottom end of the air inlet plate.

[0017] In one of the embodiments, a flow regulating member is arranged in the fume hood, and the two ends of the flow regulating member along the width direction of the fume hood are arranged at the inner side wall of the non-air inlet area and the inner side wall of the back plate of the fume hood, respectively;

[0018] The flow regulating member comprises a first flow regulating plate and two second flow regulating plates respectively arranged at the two sides of the first flow regulating plate along the length direction of the fume hood, all of which are arranged to be inclined towards the back plate from bottom to top along the height direction of the fume hood, and the first flow regulating plate is arranged opposite to the first air inlet; the two second flow regulating plates are arranged to be inclined from the side connected to the first flow regulating plate towards the side away from the first flow regulating plate from top to bottom.

[0019] In one embodiment, along the direction from the front side plate to the back plate, the width of the first rectifying plate gradually decreases, and the width of the second rectifying plate gradually increases.

[0020] In one embodiment, damping holes are provided on the first rectifying plate and the two second rectifying plates.

[0021] In one embodiment, a sound absorbing layer is provided on the inner sidewalls of the first rectifier plate and the two second rectifier plates, and the sound absorbing layer covers the damping hole.

[0022] In one embodiment, two guide plates are arranged at intervals along the length direction inside the smoke hood, and the guide plates are inclined from bottom to top toward the rectifying member along the height direction of the smoke hood, and the guide plates and the second rectifying plates are arranged in a one-to-one correspondence so that a drainage channel is formed between the guide plates and the corresponding second rectifying plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a first structural schematic diagram of a range hood with the smoke collecting plate opened provided by an embodiment of the present invention;

[0024] Figure 2 is a partial structural diagram of a front side panel provided by an embodiment of the present invention;

[0025] Figure 3 is a cross-sectional view of a smoke collection hood provided by an embodiment of the present invention;

[0026] Figure 4 1 is a schematic structural diagram of a rectifier provided in an embodiment of the present invention;

[0027] Figure 5 This is a second structural schematic diagram of the range hood with the smoke collecting plate opened provided by an embodiment of the present invention.

[0028] The names and numbers of the components in the figure are as follows:

[0029] 100, smoke hood; 10, front side panel; 20, back panel; 30, smoke collecting plate; 200, bellows;

[0030] 1. Air inlet plate; 11. First air inlet; 12. Second air inlet; 121. First side wall; 122. Second side wall; 1221. First section; 1222. Second section; 13. Non-air inlet area; 14. Inclined area; 2. Oil guide plate; 3. Rectifier; 31. First rectifier plate; 32. Second rectifier plate; 33. Damping hole; 4. Guide plate. DETAILED DESCRIPTION

[0031] For the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved, the technical solutions of the present application are further illustrated below in conjunction with the accompanying drawings and through specific embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the present application, but not to limit the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings, but not all.

[0032] In the description of the present application, unless explicitly defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless explicitly defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0034] In the description of the present embodiment, the terms "up", "down", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, which is only for the purpose of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.

[0035] The technical solutions of the present application are further illustrated below in conjunction with the accompanying drawings and through specific embodiments.

[0036] As Figure 1As shown, the oil fume machine of the embodiment comprises a smoke collecting hood 100 and a wind box 200. The smoke collecting hood 100 comprises a front side plate 10, a back plate 20, a smoke collecting plate 30, etc. A lower air inlet is formed in the bottom of the front side plate 10. The smoke collecting plate 30 is movably installed on the front side plate 10 and opens or closes the lower air inlet by manual or automatic mode. When the oil fume machine is not working, the smoke collecting plate 30 covers the lower air inlet. When the oil fume machine is working, the smoke collecting plate 30 flips relative to the front side plate 10 and opens the lower air inlet to suck the oil fume generated by the stove below the smoke collecting hood 100 into the smoke collecting cavity of the smoke collecting hood 100. The wind box 200 is installed on the top of the smoke collecting hood 100. A fan assembly is installed in the wind box 200 to discharge the oil fume in the smoke collecting cavity to the outdoor. The stove below the smoke collecting hood 100 is usually spaced two or more along the length direction (left-right direction in the figure) of the smoke collecting hood 100.

[0037] Since the middle position of the lower air inlet is on the main air inlet flow path of the fan assembly, the oil fume generated by the stoves on the left and right sides below the oil fume machine inevitably rises to the upper middle position of the lower air inlet. The existing lower air inlet structure is single, mostly long strip hole, vertical hole, etc., which cannot form effective targeted smoke suction, limiting the smoke suction efficiency of the oil fume machine.

[0038] To solve the above problems, as shown in Figure 1 and Figure 2 In the oil fume machine of the embodiment, the lower part of the front side plate 10 of the smoke collecting hood 100 is provided with a first air inlet 11 and two second air inlets 12 side by side along the length direction, and the first air inlet 11 is located between the two second air inlets 12. Along the height direction (up-down direction in the figure) of the smoke collecting hood 100, the bottom wall of the first air inlet 11 is higher than the bottom wall of the second air inlet 12 to form a non-air inlet area 13 between the two second air inlets 12. Three air inlets are provided on the front side plate 10 of the smoke collecting hood 100 along the length direction, and the first air inlet 11 is located between the two second air inlets 12. Along the height direction of the smoke collecting hood 100, the bottom wall of the first air inlet 11 is higher than the bottom wall of the second air inlet 12, and the oil fume generated by the stoves below the smoke collecting hood 100 rises to the upper middle position of the smoke collecting hood 100 and is sucked through the first air inlet 11. The non-air inlet area 13 below the first air inlet 11 is a solid non-hole part of the front side plate 10, so that the corresponding smoke collecting cavity area of the smoke collecting hood 100 in the non-air inlet area 13 forms a negative pressure environment, increasing the smoke suction amount of the two second air inlets 12 on both sides of the non-air inlet area 13, so that the oil fume generated by the stoves on the left and right sides is respectively distributed to the corresponding second air inlets 12. By providing the above three air inlets at the lower part of the smoke collecting hood 100, the smoke suction efficiency of the oil fume machine is improved.

[0039] It should be noted that the bellows 200 is mounted at the middle of the top of the fume hood 100 along its length. Therefore, the middle of the front panel 10 is located in the main air inlet path of the fan assembly within the bellows 200. This causes the cooking fumes to inevitably rise to the upper middle position of the three air inlets, allowing the first air inlet 11 to draw in smoke in a targeted manner, improving smoke extraction efficiency. Furthermore, a negative pressure environment is created within the smoke collection chamber corresponding to the non-air inlet area 13, increasing the suction force of the second air inlets 12 on the left and right sides, thereby increasing the amount of smoke extracted through the second air inlets 12.

[0040] like Figure 2 As shown, along the height direction of the smoke hood 100, the length of the first air inlet 11 gradually decreases from top to bottom, and the first side wall 121 of the second air inlet 12 away from the first air inlet 11 is tilted from top to bottom toward the first air inlet 11. Specifically, the first air inlet 11 is an inverted trapezoidal structure. The first side walls 121 of the two second air inlets 12 are tilted from top to bottom toward the first air inlet 11, so that the overall air inlet formed by the three air inlets has a trapezoidal structure with a small lower end and a large upper end, so as to better absorb the oil smoke rising to the upper middle part of the three air inlets, thereby increasing the amount of smoke from the three air inlets and thus improving the smoke extraction efficiency of the range hood.

[0041] In one embodiment, the second side wall 122 of the second air inlet 12 near the first air inlet 11 includes a first section 1221 and a second section 1222 connected at an angle. The first section 1221 is tilted from top to bottom toward the first air inlet 11 along the height direction of the smoke hood 100 and extends to the height of the bottom wall of the first air inlet 11. The second section 1222 is tilted from bottom to top toward the non-air inlet area 13 along the height direction of the smoke hood 100 and extends to the height of the top of the non-air inlet area 13. By providing the second section 1222, the intersection or crossing of the first sections 1221 of the two second side walls 122 when extending from top to bottom is avoided, and the area of ​​the non-air inlet area 13 is increased, so that the negative pressure area of ​​the non-air inlet area 13 is diffused toward the second air inlet 12 on the left and right sides, so as to increase the smoking volume and smoking efficiency of the second air inlet 12.

[0042] In one embodiment, the area of ​​the first air inlet 11 is S1, and the sum of the areas of the first air inlet 11 and the two second air inlets 12 is S, then 0.1≤S1 / S≤0.2. Specifically, the ratio of the area of ​​the first air inlet 11 to the air inlet area of ​​the lower portion of the front side panel 10 is 10%, 12%, 14%, 16%, 18%, or 20%, etc., to ensure the amount of smoke entering the first air inlet 11. If the area of ​​the first air inlet 11 is too small, the amount of smoke entering the first air inlet 11 is reduced, thereby lowering the smoking efficiency. If the area of ​​the first air inlet 11 is too large, the area of ​​the non-air inlet area 13 and the two second air inlets 12 is reduced, thereby reducing the amount of smoke entering the two second air inlets 12 and lowering the smoking efficiency.

[0043] It should be noted that the top walls of the first air inlet 11 and the second air inlet 12 are arranged at the same height. Along the height direction of the smoke hood 100, the sum of the height of the first air inlet 11 and the height h of the non-air inlet area 13 is the height of the second air inlet 12. Along the height direction of the smoke hood 100, the height of the second air inlet 12 is H, and the height of the non-air inlet area 13 is h. Therefore, 1 / 3 ≤ h / H ≤ 2 / 3. This ensures that the first air inlet 11 and the non-air inlet area 13 have appropriate heights, preventing the areas of the first air inlet 11 and the non-air inlet area 13 from being too large or too small, which may affect the smoking efficiency of the three air inlets.

[0044] like Figure 2 and Figure 3 As shown, the smoke hood 100 includes an air inlet plate 1 and an oil deflector plate 2. The air inlet plate 1 is provided with a first air inlet 11 and two second air inlets 12. The air inlet plate 1 is tilted downward from top to bottom along the height direction of the smoke hood 100, toward the interior of the smoke hood 100. The oil deflector plate 2 is tilted upward from bottom to top along the height direction of the smoke hood 100, toward the interior of the smoke hood 100, and is arranged at an angle to the air inlet plate 1. The top end of the oil deflector plate 2 is connected to the bottom end of the air inlet plate 1. Since both the air inlet plate 1 and the oil deflector plate 2 are tilted toward the interior of the smoke hood 100, the air inlet plate 1 and the oil deflector plate 2 are recessed within the smoke hood 100. One end of the smoke collecting plate 30 is hinged to the front side panel 10. When the smoke collecting plate 30 closes the air inlet, it covers the front of the air inlet plate 1 and the oil deflector plate 2. The smoke collecting plate 30 and the outer surface of the front side panel 10 are coplanar to ensure the aesthetic appearance of the range hood.

[0045] Specifically, because the first sidewall 121 of the second air inlet 12, which is away from the first air inlet 11, is tilted downward from top to bottom toward the first air inlet 11, the left and right sides of the air inlet plate 1 have inclined areas 14, i.e., solid, unperforated areas. This fully utilizes the oil smoke adhesion effect and increases the inhalation rate of the second air inlet 12. The air inlet plate 1 is connected to the oil deflector 2 at an angle, and the oil deflector 2 is tilted downward to guide the oil on the air inlet plate 1 through the oil deflector 2 to the oil collection box below the smoke collection hood 100.

[0046] In one of the embodiments, the included angle between the air inlet plate 1 and the oil guide plate 2 is α, and 120°≤α≤175°. The included angle α can be 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160°, 170°, or 175°, etc. When the front side plate 10 of the smoke collecting hood 100 is installed with the smoke gathering plate 30, the included angle α can be selected to be relatively large, so that the three air inlets are more forward, which is beneficial to improve the smoke suction efficiency. When the front side plate 10 of the smoke collecting hood 100 is not installed with the smoke gathering plate 30, the included angle α can be selected to be relatively small, that is, the recessed depth of the air inlet plate 1 and the oil guide plate 2 in the smoke collecting hood 100 is increased, which is beneficial to the gathering of the smoke, thereby improving the smoke suction efficiency.

[0047] As shown in Figure 3 and Figure 4 , the smoke collecting hood 100 is provided with a flow regulating member 3, which is respectively arranged at the inner side wall of the non-air inlet area 13 and the inner side wall of the back plate 20 of the smoke collecting hood 100 along the two ends of the width direction of the smoke collecting hood 100. The flow regulating member 3 includes a first flow regulating plate 31 and two second flow regulating plates 32 respectively located on both sides of the first flow regulating plate 31 along the length direction of the smoke collecting hood, all of which are arranged to be inclined from bottom to top towards the back plate 20 along the height direction of the smoke collecting hood 100, and the first flow regulating plate 31 is arranged opposite to the first air inlet 11. Both of the two second flow regulating plates 32 are arranged to be inclined from top to bottom towards the side away from the first flow regulating plate 31 from the side connected with the first flow regulating plate 31 to the opposite side. By arranging the flow regulating member 3, the oil fume at the lower air inlet of the smoke collecting hood 100 is drained to the upper middle part of the smoke collecting hood 100 (the position near the upper middle part of the smoke collecting hood 100), and then enters the air bellow 200 through the air outlet at the top of the smoke collecting hood 100.

[0048] As shown in Figure 3 , the front end of the flow regulating member 3 is installed on the inner side wall of the non-air inlet area 13 by welding or the like, and the rear end of the flow regulating member 3 is installed on the back plate 20 by welding or the like. Along the height direction of the smoke collecting hood 100, the top end of the flow regulating member 3 is located at about the same height as the tail end of the top air inlet of the smoke collecting hood 100, so that the oil fume in the smoke collecting hood 100 is drained to the top air inlet of the smoke collecting hood 100 by the flow regulating member 3 from the bottom air inlet, thereby improving the smoke suction efficiency. At the same time, under the flow regulating action of the flow regulating member 3, the wind speed of the second air inlet 12 can be increased by about 0.3m / s-0.5m / s, which can improve the smoke suction effect of the top air inlet of the smoke collecting hood 100 without weakening the smoke suction effect of the bottom air inlet.

[0049] As shown in Figure 4 and Figure 5As shown, the first rectifying plate 31 is opposite to the first air inlet 11, and the front end of the first rectifying plate 31 abuts against the bottom wall of the first air inlet 11, so that the oil fume at the first air inlet 11 is guided to the middle upper part of the smoke hood 100 through the upper surface of the first rectifying plate 31. The two second rectifying plates 32 are symmetrically arranged on the left and right sides of the first rectifying plate 31, the left second rectifying plate 32 is inclined to the right side, and the front end of the left second rectifying plate 32 is close to the second section 1222 of the left second air inlet 12, the right second rectifying plate 32 is inclined to the left side, and the front end of the right second rectifying plate 32 is close to the second section 1222 of the right second air inlet 12, so that the oil fume at the left and right second air inlets 12 is guided to the middle upper part of the smoke hood 100 along the upper surface of the corresponding second rectifying plate 32, respectively.

[0050] As shown in the drawings, Figure 4 As shown, the width of the first rectifying plate 31 gradually decreases in the direction from the front plate 10 to the back plate 20, and the width of the second rectifying plate 32 gradually increases. Through the above arrangement, the first rectifying plate 31 has the characteristics of large front end and small rear end, and the second rectifying plate 32 has the characteristics of small front end and large rear end, so that the front end face of the rectifying member 3 is quadrangular, and the rear end face is roughly triangular. Because the flow of oil fume in the rear area of the smoke collecting cavity is larger and relatively concentrated than that in the front area, the second rectifying member 3 is arranged in the structure of small front end and large rear end, which is more convenient for rectifying the oil fume in the rear area of the smoke collecting cavity, improves the rectifying effect, reduces the probability of turbulence of the oil fume in the smoke hood 100, and is beneficial to reduce the turbulence noise of the range hood.

[0051] As shown in the drawings, Figure 4 As shown, the first rectifying plate 31 and the two second rectifying plates 32 are each provided with a damping hole 33. The first rectifying plate 31 and the two second rectifying plates 32 are each provided with a plurality of damping holes 33 in an array, so as to form a porous sound-absorbing structure on the three rectifying plates, thereby reducing the noise of the range hood. Specifically, the diameter of the damping hole 33 is 1mm-5mm, and the perforation rate of the damping hole 33 is between 6%-24%, so as to maintain a high perforation rate, improve the acoustic impedance of the rectifying plate, and thus improve the high-frequency sound-absorbing effect of the rectifying plate.

[0052] In one embodiment, the inner side walls of the first rectifying plate 31 and the two second rectifying plates 32 are each attached with a sound-absorbing layer, and the sound-absorbing layer covers the damping hole 33. By attaching the sound-absorbing layer to the rectifying plate, the sound-absorbing and noise-reducing performance of the rectifying plate is further improved. The sound-absorbing layer is made of sound-absorbing material and is fixed to the inner side wall of the rectifying plate by adhesion or the like. The sound-absorbing material can be acoustic foam or sponge, which is not limited here.

[0053] As shown in the drawings, Figure 5As shown, two flow guides 4 are arranged in the length direction of the smoke hood 100, the flow guides 4 are arranged in the height direction of the smoke hood 100 from bottom to top and inclined to the rectifier 3, and the flow guides 4 are arranged one by one corresponding to the second rectifier plates 32, so that the flow guides 4 and the corresponding second rectifier plates 32 form a flow guide channel. Specifically, the two spaced flow guides 4 of the embodiment are symmetrically arranged on the left and right sides of the rectifier 3, and each flow guide 4 is parallel or approximately parallel to the corresponding second rectifier plate 32. The flow guide channel formed by the flow guide 4 and the second rectifier plate 32 makes the oil fume sucked by the two second air inlets 12 flow from the bottom of the flow guide channel to the middle and upper part of the smoke hood 100, avoiding the oil fume from flowing irregularly in the smoke cavity and colliding to produce noise, and avoiding the oil fume from flowing turbulently on the inner side of the non-air inlet area 13, realizing the directional flow of the oil fume in the smoke cavity, reducing the probability of the oil fume flowing irregularly and colliding to produce noise, and improving the noise of the range hood.

[0054] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments. Various changes and modifications can be made without departing from the spirit and scope of the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A range hood, characterized in that: The range hood comprises a smoke collecting hood (100), wherein a first air inlet (11) and two second air inlets (12) are arranged side by side along the length direction at the lower portion of the front side panel (10) of the smoke collecting hood (100), and the first air inlet (11) is located between the two second air inlets (12); along the height direction of the smoke collecting hood (100), the bottom wall of the first air inlet (11) is higher than the bottom wall of the second air inlet (12), so as to form a non-air inlet area (13) between the two second air inlets (12), so that the non-air inlet area (13) forms a negative pressure environment in the corresponding smoke collecting cavity area in the smoke collecting hood (100), so as to increase the amount of smoke smoke from the two second air inlets (12) on both sides of the non-air inlet area (13).

2. The range hood according to claim 1, characterized in that: Along the height direction of the smoke collecting hood (100), the length of the first air inlet (11) gradually decreases from top to bottom, and the second air inlet (12) is arranged to be inclined from top to bottom toward the first air inlet (11) away from the first side wall (121) of the first air inlet (11).

3. The range hood according to claim 2, characterized in that: The second side wall (122) of the second air inlet (12) close to the first air inlet (11) comprises a first section (1221) and a second section (1222) connected at an angle; The first section (1221) is tilted from top to bottom along the height direction of the smoke hood (100) toward the first air inlet (11) and extends to the height where the bottom wall of the first air inlet (11) is located; the second section (1222) is tilted from bottom to top along the height direction of the smoke hood (100) toward the non-air inlet area (13) and extends to the height where the top of the non-air inlet area (13) is located.

4. The range hood according to claim 1, characterized in that: The area of ​​the first air inlet (11) is S1, and the sum of the areas of the first air inlet (11) and the two second air inlets (12) is S, then 0.1≤S1 / S≤0.2; And / or, along the height direction of the smoke collecting hood (100), the height of the second air inlet (12) is H, the height of the non-air inlet area (13) is h, and then 1 / 3≤h / H≤2 / 3.

5. The range hood according to claim 1, characterized in that: The fume hood (100) comprises: An air inlet plate (1), the air inlet plate (1) being provided with the first air inlet (11) and two second air inlets (12), the air inlet plate (1) being arranged to be inclined from top to bottom toward the interior of the smoke collecting hood (100) along the height direction of the smoke collecting hood (100); An oil guide plate (2), the oil guide plate (2) is inclined from bottom to top toward the interior of the smoke hood (100) along the height direction of the smoke hood (100) and is arranged at an angle to the air inlet plate (1), and the top end of the oil guide plate (2) is connected to the bottom end of the air inlet plate (1).

6. The range hood according to any one of claims 1 to 5, characterized in that: A flow straightening member (3) is provided in the smoke collecting hood, and two ends of the flow straightening member (3) along the width direction of the smoke collecting hood (100) are respectively provided on the inner side wall of the non-air inlet area (13) and the inner side wall of the back plate (20) of the smoke collecting hood (100); The rectifying member (3) comprises a first rectifying plate (31) and two second rectifying plates (32) respectively located on both sides of the first rectifying plate (31) along the length direction of the smoke collecting hood. The three rectifying plates are all arranged to be tilted from bottom to top toward the back plate (20) along the height direction of the smoke collecting hood (100). The first rectifying plate (31) is arranged to face the first air inlet (11). The two second rectifying plates (32) are both arranged to be tilted from one side connected to the first rectifying plate (31) toward the other side opposite thereto and from top to bottom toward the side away from the first rectifying plate (31).

7. The range hood according to claim 6, characterized in that: Along the direction from the front side plate (10) to the back plate (20), the width of the first rectifying plate (31) gradually decreases, and the width of the second rectifying plate (32) gradually increases.

8. The range hood according to claim 6, characterized in that: Damping holes (33) are provided on the first rectifier plate (31) and the two second rectifier plates (32).

9. The range hood according to claim 8, characterized in that: The inner side walls of the first rectifier plate (31) and the two second rectifier plates (32) are both provided with a sound-absorbing layer, and the sound-absorbing layer is covered on the damping hole (33).

10. The range hood according to claim 6, characterized in that: Two guide plates (4) are arranged at intervals along the length direction in the smoke collecting hood (100), and the guide plates (4) are arranged obliquely from bottom to top toward the rectifying member (3) along the height direction of the smoke collecting hood (100), and the guide plates (4) and the second rectifying plates (32) are arranged in a one-to-one correspondence, so that a drainage channel is formed between the guide plates (4) and the corresponding second rectifying plates (32).

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