Range hood

Abstract

The utility model discloses a range hood. The range hood comprises: a box body, the box body is provided with a containing cavity, the box body comprises a smoke suction surface, and the smoke suction surface is provided with an upper air inlet and a lower air inlet which are communicated with the containing cavity; wherein the lower air inlet is located at the bottom end of the upper air inlet, and when the range hood is in a working state, the air volume of the lower air inlet is larger than that of the upper air inlet. The range hood provided by the utility model is simple in structure, small in size and low in cost, and can achieve the same smoke suction effect by using small air volume, so that the hearing noise of a user can be reduced, oil smoke overflow can be reduced, and the smoke suction stability can be improved.

Description

TECHNICAL FIELD

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

[0002] The range hood is arranged above the kitchen stove, and is used for extracting and discharging the oil fume generated during the cooking of food by a user. Generally, a smoke exhaust fan is arranged in the housing of the range hood, and an air inlet is arranged on the smoke suction plate. When the range hood is working, the smoke exhaust fan is started, the oil fume generated during the cooking process is sucked into the air collecting cavity of the air collecting box through the air inlet by the smoke exhaust fan, and then is discharged by the smoke exhaust fan.

[0003] In the prior art, in order to achieve a better smoke suction effect, a larger air volume is generally used. However, a larger air volume will cause a larger noise of the range hood. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a range hood to solve the technical problem in the prior art that in order to achieve a better smoke suction effect, a larger air volume is generally used, but a larger air volume will cause a larger noise of the range hood.

[0005] To solve the above technical problem, one technical scheme adopted by the present application is to provide a range hood, wherein the range hood comprises a box body, the box body is formed with a containing cavity, the box body comprises a smoke suction surface, the smoke suction surface is provided with an upper air inlet and a lower air inlet which are in communication with the containing cavity; the lower air inlet is located at the bottom end of the upper air inlet, and the air volume of the lower air inlet is greater than that of the upper air inlet in the working state of the range hood.

[0006] Further, the included angle between the upper air inlet and the horizontal plane is not less than 10 degrees, and the lower air inlet is vertically arranged.

[0007] Further, the air volume of the lower air inlet is negatively related to the distance from the front end of the upper air inlet to the wall.

[0008] Further, the ratio of the air volume of the lower air inlet to the total air volume of the range hood is greater than or equal to 60% in the working state of the range hood.

[0009] Further, the smoke suction surface is concave to form a first groove, and the upper air inlet is arranged on the groove wall of the first groove.

[0010] Further, the first groove comprises a first groove wall and a second groove wall which are connected in sequence, the first groove wall is located between the second groove wall and the lower air inlet, the upper air inlet comprises a main air inlet and a secondary air inlet, the main air inlet is arranged on the first groove wall, the secondary air inlet is arranged on the second groove wall, the area of the main air inlet is greater than that of the secondary air inlet, and / or the flow passage resistance corresponding to the main air inlet is smaller than that corresponding to the secondary air inlet.

[0011] Further, the included angle between the first groove wall and the horizontal plane in the installed state of the range hood is less than 30 degrees and greater than 10 degrees.

[0012] Further, the second groove is formed in the smoke suction surface, and the second groove includes a third groove wall and a fourth groove wall connected by a bend, the third groove wall is located between the fourth groove wall and the upper air inlet, and the lower air inlet is arranged on the fourth groove wall.

[0013] Further, the range hood has a first distance between the end of the upper air inlet away from the wall surface and the wall surface in the installed state, and has a second distance between the end of the lower air inlet away from the wall surface and the wall surface, wherein the first distance is greater than the second distance.

[0014] Further, a lower flow resistance member is arranged at the lower air inlet, the lower flow resistance member is used for blocking the flue gas, and the lower flow resistance member separates the lower air inlet into a first lower air inlet and a second lower air inlet arranged transversely; and / or an upper flow resistance member is arranged at the upper air inlet, the upper flow resistance member is used for blocking the flue gas, and the upper flow resistance member separates the upper air inlet into a first upper air inlet and a second upper air inlet arranged along the transverse direction.

[0015] Further, the distance between the bottom end of the lower air inlet and the cooking surface is greater than or equal to 200 mm and less than or equal to 480 mm, the height of the lower air inlet in the vertical direction is greater than or equal to 50 mm and less than or equal to 150 mm, and the average distance between the lower air inlet and the wall surface is greater than or equal to 30 mm and less than or equal to 150 mm in the installed state of the range hood; the distance between the end of the upper air inlet away from the wall surface and the wall surface is greater than or equal to 230 mm.

[0016] The beneficial effects of the present application: different from the prior art, the range hood provided by the present application comprises a box body, wherein the box body forms a containing cavity, the box body comprises a smoke suction surface, and the smoke suction surface is provided with an upper air inlet and a lower air inlet communicating with the containing cavity; wherein the lower air inlet is located at the bottom end of the upper air inlet, and the air volume of the lower air inlet is greater than that of the upper air inlet in the working state of the range hood. The range hood provided by the present application has simple structure and low cost, reduces the overflow of oil fume, and improves the stability of the range hood. In the application, the negative pressure generated by the airflow passing through the lower air inlet is provided to the flue gas as a force, so that the depth and width of the flue gas reaching the height of the upper air inlet are smaller, thereby reducing the volume of the range hood; by reasonably configuring the air volume ratio of the upper air inlet and the lower air inlet, a smaller air volume can be used to achieve the same smoke suction effect, thereby reducing the user's hearing noise. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art based on the drawings without creative effort should fall within the protection scope of the present application.

[0018] Figure 1 is a structural schematic view of an embodiment of the range hood provided by the present application;

[0019] Figure 2 is a structural schematic view of another embodiment of the range hood provided by the present application;

[0020] Figure 3 is a structural schematic view of another embodiment of the range hood provided by the present application.

[0021] BRIEF DESCRIPTION OF DRAWINGS: 10, range hood; 11, box body; 111, smoke suction surface; 101, upper air inlet; 102, lower air inlet; 15, first groove; 151, first groove wall; 152, second groove wall; 1011, main air inlet; 1012, auxiliary air inlet; 14, second groove; 141, third groove wall; 142, fourth groove wall; 16, lower flow resistance member; 17, upper flow resistance member; 1013, first upper air inlet; 1014, second upper air inlet; 1021, first lower air inlet; 1022, second lower air inlet; 18, opening and closing plate; 21, top plate; 22, first side plate; 23, second side plate; 24, bottom plate; 25, smoke suction plate; 251, first smoke suction plate; 252, second smoke suction plate. DETAILED DESCRIPTION

[0022] In order to make the above objectives, features and advantages of the present application more apparent and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the protection scope of the present application.

[0023] The terms "first", "second", and the like in the specification are used to distinguish between similar objects, not to describe a particular sequential order. Moreover, the terms "include", and "have", and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a list of steps or units is not limited to the listed steps or units, but can optionally further include additional steps or units not listed, or can optionally further include other steps or units inherent to such process, method, product, or device.

[0024] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described herein are combinable with each other.

[0025] The design of the range hood is to collect and discharge the oil fume generated during cooking from the kitchen. Its main working principle is to drive the oil fume to flow with the discharged air flow by discharging the air in the kitchen, so as to be collected and discharged through the smoke machine. For the same product, although larger air volume can make the smoke suction effect better, it will also bring larger noise, and make the indoor gas quickly discharged, resulting in insufficient air supply, reverse taste and other phenomena.

[0026] The present application provides a range hood with two different height air inlets. Through the design of the air inlet part flow channel of the range hood, the smoke suction effect of the range hood is improved, so that better smoke suction effect can be achieved with smaller air volume. The range hood provided by the present application will be described in detail below.

[0027] Please refer to Figure 1 as shown, Figure 1 is a structural schematic view of an embodiment of the range hood provided by the present application. Specifically, the range hood 10 includes a box body 11 and a fan (not shown in the figure).

[0028] As Figure 1 shown, the box body 11 includes a top plate 21, a first side plate 22, a second side plate 23, a smoke suction plate 25 and a bottom plate 24. Among them, one end of the smoke suction plate 25 is connected with the first side plate 22, the other end of the smoke suction plate 25 is connected with the second side plate 23, and the first side plate 22, the second side plate 23 and the smoke suction plate 25 are arranged between the top plate 21 and the bottom plate 24. The top plate 21, the first side plate 22, the second side plate 23, the smoke suction plate 25 and the bottom plate 24 are arranged to form a receiving cavity.

[0029] The receiving cavity is part of the air duct of the range hood 10. The fan of the range hood 10 can be located within this receiving cavity. In other embodiments, the fan can also be located in other locations within the air duct, for example, the fan can also be located in the air collection cavity of the air collection box at the top of the housing 11. When the range hood 10 is installed, the outer wall of the smoke extraction plate 25 is the smoke extraction surface 111, which faces the cooking area of ​​the stove.

[0030] Among them, Figure 1 In the illustrated embodiment, the smoking surface 111 is an inclined plane. In other embodiments, for example, as shown... Figure 2 As shown, Figure 2 This is a schematic diagram of another embodiment of the range hood 10 provided in this application. The smoke extraction surface 111 can also be two surfaces that are bent and connected. In other embodiments, the smoke extraction surface 111 can be a curved surface. The shape of the smoke extraction surface 111 can be set according to actual needs, and is not specifically limited here.

[0031] like Figure 1 As shown, the smoking surface 111 is provided with an upper air inlet 101 and a lower air inlet 102 that communicate with the accommodating cavity.

[0032] The lower air inlet 102 is located at the bottom of the upper air inlet 101, and the two are spaced apart. That is, the upper air inlet 101 and the lower air inlet 102 are at different heights from the cooktop surface, with the distance between the lower air inlet 102 and the cooktop surface being less than the distance between the upper air inlet 101 and the cooktop surface. Both the lower air inlet 102 and the upper air inlet 101 can be used to absorb cooking fumes. A certain amount of airflow enters the range hood through both the upper air inlet 101 and the lower air inlet 102, although generally, but not necessarily, fumes enter the range hood through both inlets. Functionally, the lower air inlet 102 mainly changes the direction of fumes flow, while the upper air inlet 101 mainly discharges any fumes that are not drawn in by the lower air inlet 102.

[0033] The design principle of the upper air inlet 101 and the lower air inlet 102 of the present application is that the smoke is additionally displaced during the process of rising due to the airflow generated by the work of the range hood 10. The minimum air volume of the range hood is obtained when the additional displacement is 0, at which time all the smoke is discharged by the force (i.e. the upper air inlet 101 acts). However, since the smoke itself occupies a large space, the minimum air volume requires that the range hood 10 has a large size in the depth direction and has no obvious forced flow after the air inlet to prevent the pressure from affecting the upstream flow to cause smoke to run, thereby affecting the appearance of the range hood and the overall beauty of the kitchen. Therefore, in the present application, the lower air inlet 102 is designed, which provides the smoke with a force by the negative pressure generated by the airflow so that the depth and width of the smoke are smaller when it reaches the height of the upper air inlet 101, thereby reducing the size of the range hood 10. The depth here refers to the length of the smoke in the direction perpendicular to the wall surface. The width refers to the length of the smoke in the direction from the left end to the right end of the range hood 10.

[0034] Further, the air volume of the lower air inlet 102 is greater than that of the upper air inlet 101 in the working state of the range hood 10 to achieve the smoke exhaust effect at the minimum air volume. The minimum air volume can be less than 13 cubic meters.

[0035] Optionally, the ratio of the air volume of the lower air inlet 102 to the total air volume of the range hood 10 is greater than or equal to 60% in the working state of the range hood 10. Preferably, the ratio of the air volume of the lower air inlet 102 to the total air volume of the range hood 10 is greater than or equal to 75%. Further, the air volume ratio of the upper air inlet 101 to the lower air inlet 102 can be between 3.5:6.5 and 1.5:8.5 to achieve the smoke exhaust effect at the minimum air volume.

[0036] Optionally, the air volume ratio of the upper air inlet 101 and the lower air inlet 102 can be achieved by the area ratio of the two air inlets (such as reducing the air passage area of the upper air inlet 101 grille) or by increasing the flow resistance structure in the whole machine. The implementation structure of the air volume ratio is within the scope of those skilled in the art and will not be described in detail here.

[0037] Further, the angle between the upper air inlet 101 and the horizontal plane is not less than 10 degrees. In the case that the smoke-sucking surface 111 does not have the opening and closing plate 18, the angle between the upper air inlet 101 and the horizontal plane is less than 30 degrees, and in the case that the smoke-sucking surface 111 has the opening and closing plate 18, the angle between the upper air inlet 101 and the horizontal plane is less than 45 degrees. The lower air inlet 102 is vertically arranged to avoid the risk of oil path and smoke acceleration caused by the air exhaust of the lower air inlet 102. Such an arrangement makes the lower air inlet 102 generate a force pointing to the wall surface on the smoke; when the upper air inlet 101 does not have the opening and closing plate 18, no force or only a vertically upward force is generated on the smoke; and when the upper air inlet 101 has the opening and closing plate 18, an additional force away from the opening and closing plate 18 is provided.

[0038] Further, the air volume of the lower air inlet 102 is negatively correlated with the distance from the front end of the upper air inlet 101 to the wall surface. That is, the greater the distance from the front end of the upper air inlet 101 to the wall surface, the smaller the air volume of the lower air inlet 102 can be designed.

[0039] In the design of the upper air inlet 101 and the lower air inlet 102 of the range hood 10, to meet the air volume requirement, the following relationships should be met: the higher the lower air inlet 102 (the greater the distance from the cooktop surface), the greater the air volume required by the lower air inlet 102; the closer the lower air inlet 102 to the wall surface, the greater the air volume required by the lower air inlet 102; the closer the front end of the upper air inlet 101 to the wall surface, the greater the air volume required by the lower air inlet 102.

[0040] Based on the above design principles, through experimental detection, the design size parameters of the upper air inlet 101 and the lower air inlet 102 are obtained as follows:

[0041] In the installed state of the range hood 10, the distance between the bottom end of the lower air inlet 102 and the cooktop surface is greater than or equal to 200 mm and less than or equal to 480 mm, so as to ensure that the suction force acts early.

[0042] The height of the lower air inlet 102 in the vertical direction is greater than or equal to 50 mm and less than or equal to 150 mm, so as to ensure that the flow rate is fast enough, and thus the size and strength of the negative pressure area are sufficient to affect the smoke to the designed size.

[0043] The height of the lower air inlet 102 is not less than 50 mm, so as to prevent the flow rate from being too fast to cause excessive noise or howling.

[0044] The average distance between the lower air inlet 102 and the wall surface is greater than or equal to 30 mm and less than or equal to 150 mm, so as to ensure the effect of the lower air inlet 102 on the smoke source away from the wall surface.

[0045] The distance between the end of the upper air inlet 101 far from the wall (front end) and the wall is not less than 200mm in the installed state of the range hood 10. Preferably, the distance between the end of the upper air inlet 101 far from the wall and the wall is greater than or equal to 230mm to ensure that the flue gas affected by the lower air inlet 102 can be discharged without the need for a large air volume to further change its movement trajectory. However, for a form adjacent to the upper air inlet 101 with an opening and closing plate 18 to assist the flue gas into the range hood 10, the distance should be not less than 180mm, and the distance between the front end of the opening and closing plate 18 and the wall should be not less than 270mm in the opened state of the opening and closing plate 18. The distance between the front end of the upper air inlet 101 and the corresponding necessary structure and the wall is not greater than 300mm, and preferably not greater than 250mm to ensure the aesthetics of the whole machine.

[0046] Further, the left and right to points of the upper air inlet 101 should exactly meet the flue gas movement to the height reachable range to meet the requirement of flue gas being discharged by the natural flow, and at the same time, the air volume is more concentrated. In some embodiments, the distance between the left and right to points and the central axis of the range hood 10 is preferably between 300-350mm.

[0047] The above-described size is the size corresponding to the minimum exhaust air volume, and the minimum size corresponding to the exhaust air volume not being too large to meet the smoking effect.

[0048] Further, in Figure 1 In the embodiment shown, the smoke suction surface 111 is concave to form a first groove 15, and the upper air inlet 101 is arranged on the groove wall of the first groove 15. In order to meet the design requirement of flue gas being discharged by the natural flow at the upper air inlet 101, the angle between the upper air inlet 101 and the horizontal plane should be as small as possible, and therefore, the first groove 15 is designed to be concave in the smoke suction surface 111.

[0049] Specifically, the first groove 15 includes a first groove wall 151 and a second groove wall 152 connected in sequence, and the first groove wall 151 and the second groove wall 152 are connected by bending. The first groove wall 151 is located between the top plate 21 and the second groove wall 152, that is, the first groove wall 151 is located on the side of the second groove wall 152 far from the lower air inlet 102.

[0050] As Figure 1As shown, the upper air inlet 101 includes a main air inlet 1011 and a secondary air inlet 1012, the main air inlet 1011 is arranged on the first groove wall 151, the secondary air inlet 1012 is arranged on the second groove wall 152, the area of the main air inlet 1011 is larger than that of the secondary air inlet 1012, and / or the flow channel resistance corresponding to the main air inlet 1011 is smaller than that corresponding to the secondary air inlet 1012. That is, in order to meet the design requirement that the flue gas is discharged smoothly at the upper air inlet 101, the angle between the upper air inlet 101 and the horizontal plane should be as small as possible, so the first concave groove 15 is designed, and the angle between the first groove wall 151 and the horizontal plane in the installed state of the range hood 10 is less than 30 degrees and greater than 10 degrees. The main air inlet 1011 is the main air interval of the upper air inlet 101, and the relatively vertical surface of the first concave groove 15 serves as the secondary air inlet of the upper air inlet 101, which reduces the air flow distribution by reducing the flow area.

[0051] Optionally, as shown in Figure 1 The range hood 10 can also be provided with an opening and closing plate 18 at the top end of the upper air inlet 101. The purpose of designing the opening and closing plate 18 is to control the radiation range of the negative pressure area of the upper air inlet 101, so as to obtain the same smoke suction effect by smaller air volume of the upper air inlet 101 and the distance to the wall. Among them, the distance from the front end of the opening and closing plate 18 to the wall in the open state is not more than 400mm, preferably not more than 350mm, so as to ensure the appearance of the whole machine and avoid blocking the line of sight of the cook. Among them, the front end of the opening and closing plate 18 refers to the end of the opening and closing plate 18 away from the wall.

[0052] Further, as shown in Figure 1 The smoke suction surface 111 is concave to form a second groove 14, the second groove 14 includes a third groove wall 141 and a fourth groove wall 142 connected by bending, the third groove wall 141 is located between the fourth groove wall 142 and the upper air inlet 101, the lower air inlet 102 is arranged on the fourth groove wall 142, and the third groove wall 141 is horizontally arranged. In terms of performance, the upper part of the lower air inlet 102 has a horizontal flow guide surface, so that the negative pressure area provided by the lower air inlet 102 is forced, thereby enhancing the suction effect of the lower air inlet 102 on the flue gas.

[0053] Further, the range hood 10 has a first distance between the end of the upper air inlet 101 away from the wall and the wall and a second distance between the end of the lower air inlet 102 away from the wall and the wall in the installed state, wherein the first distance is greater than the second distance. That is, the upper air inlet 101 is farther away from the wall, so that more rising flue gas is sucked by the upper air inlet 101, reducing the overflow of oil smoke.

[0054] Further, as shown in Figure 2 The middle part of the lower air inlet 102 and the upper air inlet 101 can be provided with a flow resistance structure to make the negative pressure area stronger near the smoke source.

[0055] Specifically, as shown in Figure 2 A lower flow resistance member 16 is arranged at the lower air inlet 102, and the lower flow resistance member 16 is used to block the flue gas. The lower flow resistance member 16 divides the lower air inlet 102 into a first lower air inlet 1021 and a second lower air inlet 1022 arranged in a transverse direction. The lower flow resistance member 16 is arranged in the middle of the lower air inlet 102, so that the negative pressure area is stronger near the position of the smoke source. Optionally, the width of the lower flow resistance member 16 is between 100-250mm.

[0056] As shown in Figure 2 An upper flow resistance member 17 is arranged at the upper air inlet 101, and the upper flow resistance member 17 is used to block the flue gas. The upper flow resistance member 17 divides the upper air inlet 101 into a first upper air inlet 1013 and a second upper air inlet 1014 arranged in a transverse direction, so that the air volume distribution of the upper air inlet 101 corresponds to the smoke source. Optionally, the width of the upper flow resistance member 17 is between 100-300mm.

[0057] The above design principle can be applied to different shapes of range hoods 10, such as Figure 1 a triangular range hood as shown. Figure 1 As shown in

[0058] The above design principle can also be applied to the range hood 10 of this shape. Specifically, as shown in Figure 2 The above design principle can also be applied to the range hood 10 of this shape. Specifically, as shown in Figure 2 The smoke suction plate 25 of the range hood 10 includes a first smoke suction plate 251 and a second smoke suction plate 252, and the first smoke suction plate 251 is bently connected to the second smoke suction plate 252. The upper air inlet 101 is arranged on the first smoke suction plate 251, and the lower air inlet 102 is arranged on the second smoke suction plate 252. The first smoke suction plate 251 is arranged obliquely, and the distance between the first smoke suction plate 251 and the cooktop gradually decreases along the direction from the front end to the rear end of the first smoke suction plate 251. The second smoke suction plate 252 is arranged vertically. According to actual tests, Figure 1 the range hood 10 shown in Figure 2 the range hood 10 shown in

[0059] As shown in Figure 3 In other embodiments, the above design principle can also be applied to L-shaped range hoods. Specifically, in Figure 3In the shown embodiment, the range hood 10 comprises a top plate 21, a connecting plate (not marked in the figure), a first smoke suction plate 251 and a second smoke suction plate 252 connected in sequence, wherein the top plate 21, the connecting plate, the first smoke suction plate 251 and the second smoke suction plate 252 surround to form a containing cavity, the first smoke suction plate 251 is provided with an upper air inlet 101 communicated with the containing cavity, the upper air inlet 101 is arranged towards the cooktop, the second smoke suction plate 252 is provided with a lower air inlet 102 communicated with the containing cavity, and the second smoke suction plate 252 is vertically arranged. According to the above design principle, the range hood 10 can achieve better smoke suction effect through smaller air volume.

[0060] It can be understood that based on the design principle of the above-mentioned range hood 10, the shape of the range hood 10 can also be other shapes, which are not listed here.

[0061] In summary, the range hood 10 provided by the present application has simple structure and low cost, reduces oil smoke overflow and improves the stability of the range hood 10. In the application, the negative pressure generated by the airflow passing through the lower air inlet 102 is provided to the flue gas as a force, so that when the flue gas reaches the height of the upper air inlet 101, its depth and width are smaller, thereby reducing the volume of the range hood 10; by reasonably configuring the air volume ratio of the upper air inlet 101 and the lower air inlet 102, the same smoke suction effect can be achieved using smaller air volume, thereby reducing the user's hearing noise.

[0062] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A range hood, characterized in that, The range hood includes: The housing has a cavity, and the housing includes a smoke extraction surface, which is provided with an upper air inlet and a lower air inlet communicating with the cavity. The lower air inlet is located at the bottom of the upper air inlet, and in the working state of the range hood, the air volume of the lower air inlet is greater than that of the upper air inlet.

2. The range hood according to claim 1, characterized in that, The angle between the upper air inlet and the horizontal plane is not less than 10 degrees, and the lower air inlet is vertically arranged.

3. The range hood according to claim 1, characterized in that, The air volume of the lower air inlet is negatively correlated with the distance from the front end of the upper air inlet to the wall.

4. The range hood according to any one of claims 1-3, characterized in that, In the operating state, the ratio of the air volume at the lower air inlet to the total air volume of the range hood is greater than or equal to 60%.

5. The range hood according to claim 1, characterized in that, The smoking surface is recessed to form a first groove, and the upper air inlet is located on the groove wall of the first groove.

6. The range hood according to claim 5, characterized in that, The first groove includes a first groove wall and a second groove wall connected in sequence. The first groove wall is located between the second groove wall and the lower air inlet. The upper air inlet includes a main air inlet and a secondary air inlet. The main air inlet is located on the first groove wall, and the secondary air inlet is located on the second groove wall. The area of ​​the main air inlet is larger than the area of ​​the secondary air inlet, and / or the flow resistance corresponding to the main air inlet is smaller than the flow resistance corresponding to the secondary air inlet.

7. The range hood according to claim 6, characterized in that, When the range hood is installed, the angle between the first groove wall and the horizontal plane is less than 30 degrees and greater than 10 degrees.

8. The range hood according to claim 1, characterized in that, The smoking surface is recessed to form a second groove, the second groove including a third groove wall and a fourth groove wall that are bent and connected. The third groove wall is located between the fourth groove wall and the upper air inlet, the lower air inlet is located on the fourth groove wall, and the third groove wall is horizontally arranged.

9. The range hood according to claim 1, characterized in that, When the range hood is installed, there is a first distance between the upper air inlet (away from the wall) and the wall, and a second distance between the lower air inlet (away from the wall) and the wall. Wherein, the first distance is greater than the second distance.

10. The range hood according to claim 1, characterized in that, A lower flow obstruction element is provided at the lower air inlet. The lower flow obstruction element is used to block the flue gas and divides the lower air inlet into a first lower air inlet and a second lower air inlet arranged horizontally; and / or, An upper flow obstruction is provided at the upper air inlet. The upper flow obstruction is used to block the flue gas and divides the upper air inlet into a first upper air inlet and a second upper air inlet arranged in a horizontal direction.

11. The range hood according to claim 1, characterized in that, The range hood in the installed state The distance between the bottom of the lower air inlet and the stove surface is greater than or equal to 200mm and less than or equal to 480mm, the vertical height of the lower air inlet is greater than or equal to 50mm and less than or equal to 150mm, and the average distance between the lower air inlet and the wall is greater than or equal to 30mm and less than or equal to 150mm. The distance between the end of the upper air inlet away from the wall and the wall is greater than or equal to 230mm.

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