Exhaust fume collecting hood assembly and range hood

Abstract

The utility model belongs to the technical field of kitchen utensils, and discloses an exhaust fume collecting hood assembly and a range hood, a smoke inlet adopts a long-strip hole, the maximum length of the long-strip hole is limited to be more than eight times of the maximum width of the long-strip hole, so that the smoke inlet forms a long-strip-shaped slit-type smoke inlet, the smoke flow rate is increased by utilizing the design of the slit-type smoke inlet, and the smoke flow rate is increased by utilizing the design of the slit-type smoke inlet; smoke generated by cooking can rapidly enter the smoke collecting shell through the slit smoke inlet, the smoke diffusion range is reduced, and the smoke suction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a smoke collection hood assembly and a range hood. Background Technology

[0002] Range hoods are common household appliances in kitchens. They are usually installed above the stove to quickly remove the waste produced by the stove and the harmful fumes generated during cooking. They condense the fumes and collect the condensed oil. After condensation treatment, the fumes are discharged outdoors to purify the air, reduce pollution, and provide safety protection against poisoning and explosion.

[0003] A range hood consists of a smoke collection housing and a fan. The smoke collection housing has an air duct inside, and one end of the air duct forms an air inlet. When the fan is started, it creates a negative pressure at the air inlet, and the outside air around the air inlet is drawn into the air inlet under the action of the negative pressure.

[0004] With the development of range hoods, current technology proposes to place the range hood body at the bottom of the cabinet, making full use of the space at the bottom of the cabinet through body design. In order to embed the body into the cabinet, the depth of the smoke collection shell needs to be reduced, but this reduces the range hood's ability to collect and suck up oil fumes. As a result, some oil fumes drift upwards and escape from the negative pressure zone of the air inlet, escaping in all directions. This is especially serious when the amount of oil fumes is too large, affecting the kitchen environment and the user's physical and mental health. Utility Model Content

[0005] The purpose of this utility model is to provide a smoke collection hood assembly and a range hood that can improve the smoke extraction effect of the smoke collection hood assembly.

[0006] To achieve this objective, in a first aspect, the present invention provides a smoke collection hood assembly, including a smoke collection housing with a smoke inlet and a baffle installed on the smoke collection housing. The baffle covers at least part of the smoke inlet to form at least one smoke inlet. The smoke inlet is an elongated hole, and the maximum length of the elongated hole is greater than eight times the maximum width of the elongated hole.

[0007] As one possible implementation of the above-mentioned smoke collection hood assembly, multiple smoke inlets are provided, including two first smoke inlets and two second smoke inlets. The two first smoke inlets are arranged opposite to each other and spaced apart along the front-to-back direction of the range hood, and the two second smoke inlets are arranged opposite to each other and spaced apart along the left-to-right direction of the range hood.

[0008] At least one first smoke inlet has a length of L1 in the left-right direction and a width of W1 in the front-back direction, where L1 > 8 * W1; and / or, at least one second smoke inlet has a length of L2 in the front-back direction and a width of W2 in the left-right direction, where L2 > 8 * W2.

[0009] As one possible implementation of the above-mentioned smoke hood assembly, one of the first smoke inlets is a forward smoke inlet, and the other first smoke inlet is a rear smoke inlet, with the forward smoke inlet located in front of the rear smoke inlet along the front-rear direction;

[0010] The width of the forward smoke inlet in the front direction is greater than the width of the rear smoke inlet in the front direction, or the width of the forward smoke inlet in the front direction is less than the width of the rear smoke inlet in the front direction.

[0011] As one possible implementation of the aforementioned smoke hood assembly, the width W1 of the forward smoke inlet along the front-to-back direction includes W 11 50mm≤W 11 ≤70mm;

[0012] And / or, the width W1 of the rear smoke inlet along the front-to-back direction includes W 12 30mm≤W 12 ≤50mm;

[0013] And / or, 590mm≤L2≤615mm;

[0014] And / or, 315mm≤W2≤355mm.

[0015] As one possible implementation of the above-mentioned smoke hood assembly, the cross-section of the first smoke inlet and the cross-section of the second smoke inlet adjacent to it along the circumference of the smoke collection shell are connected or not connected, and the cross-section of the first smoke inlet and the cross-section of the second smoke inlet are perpendicular to the air inlet direction of the hood.

[0016] As one possible implementation of the above-mentioned smoke collection hood assembly, the smoke collection housing is provided with a smoke collection channel, one end of which forms the hood air inlet. The smoke collection housing includes two outer side surfaces arranged opposite to each other along the left and right directions of the range hood, and a smoke inlet end face with the hood air inlet.

[0017] At least one outer surface is connected to the smoke inlet end face via a first guide surface, and the first guide surface gradually approaches the central axis of the smoke collection channel extending in the vertical direction along the top to bottom; and / or, the front surface of the smoke collection shell is connected to the smoke inlet end face via a second guide surface, and the second guide surface gradually approaches the central axis of the smoke collection channel extending in the vertical direction along the top to bottom.

[0018] As one possible implementation of the above-mentioned smoke collection hood assembly, at least one outer surface is connected to the smoke inlet end face through a first guide surface, the first guide surface including a chamfered surface or a rounded chamfered surface;

[0019] And / or, the front side of the smoke collection shell is connected to the smoke inlet end face through a second guide surface, the second guide surface including a chamfered surface or a rounded chamfered surface.

[0020] As one possible implementation of the above-mentioned smoke collection hood assembly, at least one outer side is connected to the smoke inlet end face through a first guide surface. The cross section of the first guide surface intersects the outer side at point E, and the cross section of the first guide surface intersects the smoke inlet end face at point F. The angle between the line connecting points E and F and the horizontal plane is β, 10°≤β≤65°. The cross section of the first guide surface is perpendicular to the front-back direction of the range hood. The end of the smoke collection channel away from the air inlet of the hood extends to the top surface of the smoke collection housing. The first cross section of the top surface intersects the outer side at point P. The vertical distance between points E and P is h, and the vertical distance between points F and P is H, 0.25≤h / H<1. The first cross section of the top surface is perpendicular to the front-back direction of the range hood.

[0021] And / or, the front side of the smoke collection housing is connected to the smoke inlet end face through the second guide surface. The cross section of the second guide surface intersects the front side at point M, and the second guide surface intersects the smoke inlet end face at point N. The angle between the line connecting points M and N and the horizontal plane is γ, 10°≤γ≤65°. The cross section of the second guide surface is perpendicular to the left and right direction of the range hood. The end of the smoke collection channel away from the air inlet of the hood extends to the top surface of the smoke collection housing. The second cross section of the top surface intersects the front side at point Q. The vertical distance between points M and Q is d, and the vertical distance between points N and Q is D, 0.25≤d / D<1. The second cross section of the top surface is perpendicular to the left and right direction of the range hood.

[0022] As one possible implementation of the above-mentioned smoke collection hood assembly, the smoke collection housing includes two outer side surfaces arranged opposite to each other along the left and right direction of the range hood, and a smoke inlet end face with an air inlet for the hood.

[0023] At least one outer surface is connected to the smoke inlet end face via a first guide surface. The cross-section of the first guide surface intersects the outer surface at point E and the cross-section of the first guide surface intersects the smoke inlet end face at point F. The cross-section of the first guide surface is perpendicular to the front-back direction of the range hood. When the first guide surface includes a rounded chamfer, the radius of the rounded chamfer is R1, and R1 is greater than the length of the line segment connecting points E and F. And / or, the front surface of the smoke collection housing is connected to the smoke inlet end face via a second guide surface. The cross-section of the second guide surface intersects the front surface at point M and the cross-section of the second guide surface intersects the smoke inlet end face at point N. The cross-section of the second guide surface is perpendicular to the left-right direction of the range hood. When the second guide surface includes a rounded chamfer, the radius of the rounded chamfer is R2, and R2 is greater than the length of the line segment connecting points M and N.

[0024] Secondly, this utility model also provides a range hood, including a power structure and the aforementioned smoke collection hood assembly, wherein the outlet of the smoke collection channel of the smoke collection shell is connected to the power structure.

[0025] The beneficial effects of this utility model are as follows: The smoke inlet of the smoke collection hood and the range hood provided by this utility model adopts an elongated hole, and the maximum length of the elongated hole is limited to eight times the maximum width of the elongated hole, so that the smoke inlet forms an elongated slit-type smoke inlet. The design of the slit-type smoke inlet increases the airflow velocity, so that the smoke generated by cooking can quickly enter the smoke collection shell through the slit-type smoke inlet, reduce the range of smoke diffusion, and improve smoke extraction efficiency. Attached Figure Description

[0026] Figure 1 This is a simplified schematic diagram of the principle of the range hood provided in Embodiment 1 of this utility model;

[0027] Figure 2 This is a simplified cross-sectional view of the four-sided annular suction fume extraction scheme with W1=W2 provided in Embodiment 1 of this utility model;

[0028] Figure 3 This is a simplified cross-sectional view of the three-sided suction fume extraction solution provided in Embodiment 1 of this utility model;

[0029] Figure 4 This is a simplified cross-sectional view of the two-sided enclosed fume extraction solution provided in Embodiment 1 of this utility model;

[0030] Figure 5 This is the response surface optimization diagram of the four-sided annular suction slit-type smoke inlet with W1=W2 provided in Embodiment 1 of this utility model;

[0031] Figure 6 This is an optimized response surface diagram of the three-sided suction-type slit-type smoke inlet provided in Embodiment 1 of this utility model;

[0032] Figure 7 This is an optimized response surface diagram of the two-sided enclosed smoke inlet provided in Embodiment 1 of this utility model;

[0033] Figure 8 This is a simplified cross-sectional view of the four-sided annular suction fume extraction scheme with W1 greater than W2 provided in Embodiment 1 of this utility model;

[0034] Figure 9 This is a simplified cross-sectional view of the four-sided annular suction fume extraction scheme with W1 less than W2 provided in Embodiment 1 of this utility model;

[0035] Figure 10 This is the response surface optimization diagram of the four-sided annular suction slit-type smoke inlet with W1 greater than W2 provided in Embodiment 1 of this utility model;

[0036] Figure 11 This is the response surface optimization diagram of the four-sided annular suction slit-type smoke inlet with W1 less than W2 provided in Embodiment 1 of this utility model;

[0037] Figure 12This is a simplified cross-sectional view of another four-sided annular suction fume extraction solution provided in Embodiment 1 of this utility model;

[0038] Figure 13 This is a simplified cross-sectional view of another four-sided annular suction fume extraction solution provided in Embodiment 1 of this utility model;

[0039] Figure 14 This is a schematic diagram of the structure of the range hood provided in Embodiment 2 of this utility model;

[0040] Figure 15 This is a partially enlarged schematic diagram of the smoke collection shell when the first guide surface of the present invention adopts a chamfered surface, as provided in Embodiment 2 of the present invention;

[0041] Figure 16 This is a partially enlarged schematic diagram of the smoke collection shell when the first guide surface of the present invention adopts a rounded chamfered surface;

[0042] Figure 17 It is a simulation diagram of the airflow when a traditional range hood extracts cooking fumes.

[0043] Figure 18 This is a diagram showing the state of a traditional range hood when it is working, where the outside air around the outer side is drawn into the air inlet of the hood.

[0044] Figure 19 This is a simulation diagram of airflow during the extraction of cooking fumes provided in Embodiment 2 of this utility model;

[0045] Figure 20 When the smoke collection housing 200 has a first guide surface 3 on both the left and right sides, or when it has no first guide surface 3, the range hood adopts a two-sided surround design, a three-sided suction design, or a W-shaped design. 11 =W 12 The four-sided surround suction design, and W 11 >W 12 DOE response surface optimization diagram for the four-sided ring suction scheme;

[0046] Figure 21 The images show a comparison of the smoke extraction effects of the range hoods when using the smoke extraction scheme provided in Example 2 and three other smoke extraction schemes.

[0047] Figure 22 This is a schematic diagram of the smoke collection shell provided in Embodiment 3 of this utility model;

[0048] Figure 23 This is a partially enlarged schematic diagram of the smoke collection shell when the second guide surface is a chamfered surface, as provided in Embodiment 3 of this utility model;

[0049] Figure 24With the premise that the smoke collection housing 200 has a first guide surface 3 on both the left and right sides, and a second guide surface 5 on the front side of the smoke collection housing 200, and without the second guide surface 5, the range hood adopts a two-sided surround design, a three-sided suction design, or a W-shaped design. 11 =W 12 The four-sided surround suction design, and W 11 >W 12 The DOE response surface optimization diagram for the four-sided ring suction scheme.

[0050] In the picture:

[0051] 1. Outer side; 2. Front side; 3. First guide surface; 4. Smoke inlet end face; 5. Second guide surface; 6. Top surface;

[0052] 10. First smoke inlet; 20. Second smoke inlet;

[0053] 100. Range hood housing; 200. Smoke collection housing; 201. Baffle; 300. Power structure; 400. Cabinet; 500. Stovetop. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0055] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0058] Example 1

[0059] like Figure 1 and Figure 2 As shown, an embodiment of this utility model provides a smoke collection hood assembly and a range hood including the smoke collection hood assembly. The range hood also includes a range hood housing 100 and a power structure 300. The smoke collection hood assembly includes a smoke collection shell 200, which is connected to the range hood housing 100. The range hood housing 100 has an air duct, and the smoke collection shell 200 has a smoke collection channel. One end of the smoke collection channel forms a hood air inlet, and the other end of the smoke collection channel is connected to the inlet of the air duct. The power structure 300 is located inside the air duct, so that the outlet of the smoke collection channel is connected to the power structure 300. The range hood housing 100 is installed inside the cabinet 400, and the stove 500 is located directly below the hood air inlet. The range hood housing 100 is located above the smoke collection shell 200, and the bottom of the smoke collection shell 200 is provided with an oil cup for collecting waste oil condensed during the operation of the range hood. The power structure 300 includes a device for generating airflow, consisting of a motor and blades. During the operation of the range hood, the power structure 300 works, creating a negative pressure near the air inlet of the hood, and air outside the smoke collection housing 200 is drawn into the air inlet of the hood.

[0060] The smoke hood assembly also includes a baffle 201 installed on the smoke collection housing 200. The baffle 201 covers at least part of the hood air inlet to form at least one smoke inlet. The smoke inlet is an elongated hole, and the maximum length of the elongated hole is more than eight times the maximum width of the elongated hole.

[0061] The smoke hood assembly provided in this embodiment has an elongated hole for the smoke inlet, and the maximum length of the elongated hole is limited to eight times the maximum width of the elongated hole. This makes the smoke inlet a long, narrow slit-shaped smoke inlet. The design of the slit-shaped smoke inlet increases the airflow velocity, allowing the smoke generated during cooking to quickly enter the smoke collection shell through the slit-shaped smoke inlet, reducing the range of smoke diffusion and improving smoke extraction efficiency.

[0062] Furthermore, the range hood has multiple smoke inlets, including two first smoke inlets 10 and two second smoke inlets 20. The two first smoke inlets 10 are arranged opposite each other and spaced apart along the front-to-back direction of the range hood, and the two second smoke inlets 20 are arranged opposite each other and spaced apart along the left-to-right direction of the range hood. At least one first smoke inlet 10 has a length of L1 along the left-to-right direction and a width of W1 along the front-to-back direction, where L1 > 8 * W1; and / or, at least one second smoke inlet 20 has a length of L2 along the front-to-back direction and a width of W2 along the left-to-right direction, where L2 > 8 * W2.

[0063] For example, each first smoke inlet 10 satisfies L1 > 8 * W1, and each second smoke inlet 20 satisfies L2 > 8 * W2. In other embodiments, only the first smoke inlet 10 may satisfy L1 > 8 * W1; and only the second smoke inlet 20 may satisfy L2 > 8 * W2. It should be noted that the left and right directions refer to the side of the smoke collection hood assembly facing the user when cooking with the user facing the range hood, which is the front side, and the side of the smoke collection hood assembly facing away from the user, which is the rear side; the user's left and right directions are the left and right directions of the smoke collection hood assembly.

[0064] Since at least one first smoke inlet 10 has a length of L1 in the left-right direction and a width of W1 in the front-back direction, where L1 > 8 * W1, the first smoke inlet 10 that satisfies L1 > 8 * W1 forms an elongated slit smoke inlet. At least one second smoke inlet 20 has a length of L2 in the front-back direction and a width of W2 in the left-right direction, where L2 > 8 * W2, the second smoke inlet 20 that satisfies L2 > 8 * W2 forms an elongated slit smoke inlet. The design of the slit smoke inlet can increase the airflow velocity, allowing the smoke generated during cooking to quickly enter the smoke collection shell 200 through the slit smoke inlet, reducing the range of smoke diffusion, improving smoke extraction efficiency and oil fume extraction effect, and enhancing the user experience.

[0065] Furthermore, the baffle 201 is detachably installed on the smoke collection housing 200, making it convenient for users to remove the baffle 201 in a timely manner for cleaning.

[0066] For example, the baffle 201 divides the air inlet of the hood into two first smoke inlets 10 and two second smoke inlets 20. In other words, the first smoke inlets 10 and the second smoke inlets 20 are both formed between the baffle 201 and the smoke hood.

[0067] After the fumes impact the baffle 201, they flow along its surface. Once the fumes reach the edge of the baffle 201, they can directly enter the first smoke inlet 10 and the second smoke inlet 20. The fumes do not need to be redirected, resulting in low wind resistance, a low probability of escape, and more thorough fume extraction. Alternatively, the baffle 201 can completely cover the air inlet, and two second smoke inlets 20 spaced apart and opposite each other in the left-right direction, and two first smoke inlets 10 spaced apart and opposite each other in the front-back direction, can be provided on the baffle 201.

[0068] The slit-type smoke inlet is not limited to the two first smoke inlets 10 arranged opposite each other in the left-right direction and the two second smoke inlets 20 arranged opposite each other in the left-right direction. Figure 2 The four-sided surround suction scheme shown; alternatively, the following can be used: Figure 3 The three-sided suction system shown, and Figure 4 The two-sided enclosed scheme is shown.

[0069] First build them separately Figure 2 As shown, Figure 3 As shown and Figure 4 The model of the range hood with a slit-type smoke inlet shown is used to determine the variable factors affecting the size of the slit-type smoke inlet, including the length and width of the inlet. The size range of these variable factors is determined based on the slit size requirements of the slit effect and the size limits of the range hood. Then, a parametric simulation model is built and parametric simulation is performed. The accuracy requirement is determined using the standard deviation of the residuals; when σ≤10... -5 High accuracy; the residual δ is the difference between the simulated value and the predicted value of the regression equation fitted to the variable factors. Then, DOE response surface analysis is performed based on the simulation results. The output relationship is used for response surface analysis, which includes first-order, second-order, and even third-order relationships. If the fit R ≥ 99%, the optimal solution is output. If the fit R does not meet the requirements, the corresponding relationship is modified from first-order to second-order, or second-order to third-order, and so on.

[0070] It should be noted that DOE stands for Design of Experiments, used to improve product quality and process flow. DOE response surface methodology is existing technology in this field and will not be described in detail here. Simulation data for the four-sided surround suction design is detailed in Table 1, simulation data for the three-sided suction design is detailed in Table 2, and simulation data for the two-sided enclosure design is detailed in Table 3.

[0071] Table 1

[0072]

[0073] Table 2

[0074]

[0075]

[0076] Table 3

[0077]

[0078]

[0079] Figure 5 yes Figure 2 The response surface optimization diagram of the slit-type smoke inlet is shown. Figure 6 yes Figure 3 The response surface optimization diagram of the slit-type smoke inlet is shown. Figure 7 yes Figure 4 This is the response surface optimization diagram for the slit-type smoke inlet shown. A comparison reveals that... Figure 2 The four-sided surround suction scheme shown has a better smoke extraction effect than the other two schemes. Moreover, the four-sided surround suction scheme has the best spatial layout, followed by the two-sided surround scheme, and lastly the three-sided suction scheme.

[0080] It should be noted that, Figure 5 , Figure 6 and Figure 7 In this context, a corresponds to L1, b corresponds to L2, and c corresponds to W1. Figures 2 to 4 In all three designs, the maximum dimensions of the air inlet along the left-right direction and the maximum dimensions along the front-back direction are the same. This is also a commonly used size for the air inlet of a range hood in this field. For Figure 2 The illustrated four-sided surround suction design features front and rear smoke inlets arranged symmetrically about a plane perpendicular to the front-to-back direction, and left and right smoke inlets arranged symmetrically about a plane perpendicular to the left-to-right direction. Once... Figure 2 Once L1, L2, and W1 are determined, the dimensions of each smoke inlet are also determined. Figure 3 The three-sided smoke inlet shown has its left and right smoke inlets symmetrically arranged about a plane perpendicular to the left and right directions. Figure 3 Once L1, L2, and W1 are determined, the dimensions of each smoke inlet are also determined. Figure 4 The illustrated two-sided enclosed design features front and rear smoke inlets arranged symmetrically about a plane perpendicular to the front-rear direction, and left and right smoke inlets arranged symmetrically about a plane perpendicular to the left-right direction. Once... Figure 4Once L1, L2, W1, and W2 are determined, the dimensions of each smoke inlet are also determined. L1 is a known fixed value determined based on the relationship L1 > 8 * W1 and the minimum distance between the two smoke inlets on the front side along the left and right directions. When L1 is determined, since the maximum distance between the left and right smoke inlets along the left and right directions is determined, W2 can be determined accordingly.

[0081] Furthermore, one of the first smoke inlets 10 is a forward smoke inlet, and the other is a rear smoke inlet; the forward smoke inlet is located in front of the rear smoke inlet in the front-back direction, and the width of the forward smoke inlet in the front-back direction is not equal to the width of the rear smoke inlet in the front-back direction.

[0082] The first smoke inlet 10, which has a smaller width in the front-to-back direction, has a larger flow velocity, which guides the oil fumes to the first smoke inlet 10, which has a smaller width in the front-to-back direction. This allows the first smoke inlet 10 to absorb more smoke, reduces the amount of smoke escaping around the first smoke inlet 10, which has a larger width in the front-to-back direction, and increases the amount of oil fumes absorbed by the smoke collection hood assembly.

[0083] Furthermore, such as Figure 8 As shown, the width of the forward flue gas inlet along the front-to-back direction is greater than the width of the rear flue gas inlet along the front-to-back direction. For ease of description, the width W1 of the forward flue gas inlet along the front-to-back direction includes W... 11 The width W1 of the rear smoke inlet along the front-to-back direction includes W 12 In this embodiment, W 11 Greater than W 12 As an alternative, another option is to use Figure 9 The W shown 11 Less than W 12 The solution.

[0084] The narrower rear smoke inlet has a higher flow velocity, guiding the fumes towards it. This allows the rear smoke inlet to absorb more fumes, reducing the amount of fumes escaping around the wider front smoke inlet and increasing the amount of fumes absorbed by the smoke collection hood assembly. Furthermore, the rear of the range hood is generally placed against the wall, resulting in less fume escape. This arrangement also helps reduce the amount of fumes condensing on the wall, thus minimizing the negative impact on the user experience.

[0085] Preferably, L1 = 595 mm, L2 = 345 mm. Specifically, for Figure 2 The four-sided surround suction scheme shown was used to build a parametric simulation model based on the experimental data in Table 1 and the size limits of the hood inlet, and parametric simulation was performed. The accuracy requirement was determined by the standard deviation of the residuals. When σ≤10 -5 High accuracy; the residual δ is the difference between the simulated value and the predicted value of the fitted regression equation of the variable factors; then, DOE response surface analysis is performed based on the simulation results to obtain... Figure 5 The DOE response surface optimization plot shown is based on Figure 5 The DOE response surface optimization diagram shows that within the range of 30mm≤W1≤70mm, 590mm≤L1≤615mm, and 315mm≤L2≤355mm, the range hood has a better smoke extraction effect. Considering that when using two cooktops, the minimum distance between the central axes of the two cooktops is 595mm, therefore L1≥595mm is required. And according to... Figure 5 The DOE response surface methodology diagram shows that the range hood's smoke extraction effect is better when L1 = 595mm than when L1 < 595mm and L1 > 595mm. Therefore, L1 = 595mm is selected. Furthermore, based on the cooktop dimensions, the minimum distance between the front and rear smoke inlets must be less than or equal to 345mm. Figure 5 The DOE response surface optimization plot shown indicates that when L1 = 595mm, the smoke extraction effect when L2 < 345mm is not as good as when L2 = 345mm. Therefore, L2 = 345mm is selected. Combined with... Figure 5 The DOE response surface optimization diagram shown indicates that, under the premise of L1 = 595mm and L2 = 345mm, the smoke extraction effect of the range hood is not as good as that when W1 = 30mm, regardless of whether W1 is greater than 30mm or less than 30mm. Therefore, W1 = 30mm is selected.

[0086] for Figure 8 and Figure 9 The proposed scheme uses the data in Table 4 and the dimensional limits of the hood inlet to build a parametric simulation model, and then performs parametric simulation. The standard deviation of the residuals is used to determine the accuracy requirement; when σ≤10 -5 High accuracy; the residual δ is the difference between the simulated value and the predicted value of the fitted regression equation of the variable factors; then, DOE response surface analysis is performed based on the simulation results to obtain... Figure 10 and Figure 11 The DOE response optimization diagram shown is as follows, where, Figure 10 yes Figure 8 The diagram shows the DOE response optimization of the proposed solution. Figure 11 yes Figure 9 The diagram shows the DOE response optimization for the proposed scheme.

[0087] pass Figure 5 , Figure 10 and Figure 11 The DOE response optimization diagram and the comparison of the fume extraction effect in Tables 1 and 4 show that W 11 Greater than W 12 The range hood, and W 11 Less than W 12 W range hood 11Greater than W 12 The range hood's smoke extraction effect is significantly better than W's. 11 Less than W 12 The range hood's smoke extraction effect, and Figure 2 As shown in W 11 =W 12 The smoke extraction effect of this range hood is quite similar to that of W. 11 Greater than W 12 The range hood's smoke extraction effect is better than W's, but still less effective. 11 Greater than W 12 The smoke extraction effect of the range hood. It should be noted that Table 4 is based on different W values, assuming L1 = 595mm and L2 = 345mm. 11 and W 12 The experimental results obtained, Figure 10 and Figure 11 Based on different W values, under the premise of L1 = 595mm and L2 = 345mm. 11 and W 12 The resulting DOE response optimization diagram.

[0088] Figure 2 Of the two W1s shown in the diagram, the W1 of the first smoke inlet 10 on the front side is W1. 11 W1 of the first smoke inlet 10 on the rear side is W. 12 It should be noted that, Figure 10 and Figure 11 In the middle, a corresponds to W. 11 b corresponds to W 12 .

[0089] Table 4

[0090]

[0091] See Table 1 and Figure 10 and Figure 11 As shown in the DOE response surface optimization diagram, with L1 = 595mm and L2 = 345mm, and referring to Table 4, the range hood achieves the best smoke extraction efficiency (84.77%) when W1 = 30mm. Comparative verification of W... 11 Greater than W 12 and W 11 Less than W 12 The smoke extraction effect of these two range hoods, W 11 Greater than W 12 The range hood's smoke extraction efficiency is higher than 84.96%, while W 11 Less than W 12 The smoke extraction efficiency of W's range hoods is less than 80%, therefore... 11 Greater than W 12 The range hood's smoke extraction effect is better than W's.11 Less than W 12 The range hood's smoke extraction effect is superior to W's. 11 =W 12 The effective smoke extraction of a range hood is due to the fact that the back of the range hood is usually installed against the wall, making it difficult for smoke to escape.

[0092] Preferably, W 11 =65mm, W 12 =45mm. Specifically, according to Figure 10 and Figure 11 The DOE response surface optimization plot shown indicates that, given L1 = 595 mm and L2 = 345 mm, W 11 Greater than W 12 The range hood has a better smoke extraction effect. Considering aesthetic design and oil circuit design, based on experience, a 50mm ≤ W range hood is selected. 11 ≤70mm, 30mm≤W 12 ≤50mm, and according to Figure 10 The DOE response surface optimization plot shown yields the following results: given L1 = 595 mm and L2 = 345 mm, W 11 =65mm, W 12 The range hood achieves optimal smoke extraction when the thickness is 45mm.

[0093] Furthermore, such as Figure 8 As shown, the cross-section of the first smoke inlet 10 and the cross-section of the second smoke inlet 20 adjacent to it in the circumferential direction along the smoke collection shell 200 are not connected. The cross-sections of the first smoke inlet 10 and the second smoke inlet 20 are perpendicular to the air intake direction of the hood inlet. In other words, the first smoke inlet 10 and the second smoke inlet 20 are independent of each other while satisfying the requirement that the two first smoke inlets 10 are arranged opposite each other and spaced apart in the front-to-back direction, and the two second smoke inlets 20 are arranged opposite each other and spaced apart in the left-to-right direction.

[0094] For example, such as Figure 8 As shown, the cross-section of the first smoke inlet 10 is connected to the cross-section of the second smoke inlet 20 adjacent to it in the circumferential direction of the smoke collecting shell 200. Specifically, the maximum length of the first smoke inlet 10 in the left-right direction is equal to the minimum interval between the two second smoke inlets 20 in the left-right direction, and the maximum length of the second smoke inlet 20 in the front-back direction is equal to the minimum interval between the two first smoke inlets 10 in the front-back direction. In other embodiments, such as Figure 12 As shown, the maximum length of the first smoke inlet 10 in the left-right direction can be made smaller than the minimum interval between the two second smoke inlets 20 in the left-right direction, and the maximum length of the second smoke inlet 20 in the front-back direction can be made smaller than the minimum interval between the two first smoke inlets 10 in the front-back direction.

[0095] In other embodiments, such as Figure 13In the illustrated embodiment, the cross-section of the first smoke inlet 10 is connected to the cross-section of the second smoke inlet 20 adjacent to it in the circumferential direction along the smoke collection housing 200. Exemplarily, one end of each first smoke inlet 10 in the left-right direction is connected to one of the second smoke inlets 20, and the other end is connected to the other second smoke inlet 20, such that the two first smoke inlets 10 and the two second smoke inlets 20 form an annular smoke inlet.

[0096] Example 2

[0097] This embodiment, based on Embodiment 1, adds a first guide surface 3. For example... Figure 14 and Figure 15 As shown, the smoke collection housing 200 includes two outer side surfaces 1 arranged opposite to each other in the left-right direction of the range hood, and a smoke inlet end face 4 with the above-mentioned hood air inlet; at least one outer side surface 1 is connected to the smoke inlet end face 4 through a first guide surface 3, and in the direction from top to bottom, the first guide surface 3 gradually approaches the central axis of the smoke collection channel extending in the vertical direction.

[0098] During operation, when external air flows near the first guide surface 3, it flows along and adheres to the first guide surface 3, and then smoothly flows into the hood inlet. The design of the first guide surface 3 better conforms to the fluid flow pattern, thereby effectively suppressing boundary layer separation and ensuring stable airflow around the first guide surface 3. Moreover, the design of the first guide surface 3 utilizes the Coanda principle, which can change the airflow state while reducing airflow resistance. This allows most of the air to smoothly flow from the left and right sides of the range hood into the hood inlet along the first guide surface 3, achieving a supplementary airflow effect to the hood inlet, thereby improving the overall smoke extraction effect of the range hood and enhancing the user experience.

[0099] In addition, connecting the outer side 1 to the smoke inlet end face 4 via the first guide surface 3 can also optimize the appearance of the smoke collection shell 200.

[0100] For example, each of the two outer surfaces 1 is connected to the smoke inlet end face 4 through a first guide surface 3, so that when the range hood is working, the air inlet of the hood is supplemented from the left and right sides of the hood air inlet to improve the smoke extraction effect of the entire range hood.

[0101] It should be noted that the end of the smoke collection channel away from the air inlet of the cover extends to the top surface of the smoke collection housing 200. The top surface of the smoke collection housing 200 is flat, which makes it easy to install the smoke collection housing 200 on the cabinet 400.

[0102] Furthermore, such as Figure 14 and Figure 15 As shown, the first guide surface 3 includes a chamfered surface, and the first guide surface 3 is easy to process and has low cost. In other embodiments, such as Figure 16As shown, the first guide surface 3 can also be a rounded chamfered surface.

[0103] When using the Coanda effect to alter the airflow trajectory, the airflow towards the first guide surface 3 will generate an expanding flow, increasing the downstream pressure and thus compressing the air to deflect laterally. However, if the tilt angle of the first guide surface 3 is too small, the guiding effect will be weak; if the tilt angle of the first guide surface 3 is too large, the airflow will separate from the first guide surface 3 after passing through it and will no longer adhere to the smoke inlet end face 4 connected to the first guide surface 3, thereby reducing the guiding effect.

[0104] In view of this, such as Figure 14 and Figure 15 As shown, the cross-section of the first guide surface 3 intersects the outer surface 1 at point E, and the cross-section of the first guide surface 3 intersects the smoke inlet end face 4 at point F. The angle between the line connecting points E and F and the horizontal plane is β, 10°≤β≤65°. The cross-section of the first guide surface 3 is perpendicular to the front-back direction of the range hood. The first cross-section of the top surface intersects the outer surface 1 at point P. The vertical distance between points E and P is h, and the vertical distance between points F and P is H, 0.25≤h / H<1. The first cross-section of the top surface is perpendicular to the front-back direction of the range hood.

[0105] The line connecting points E and F is denoted as line segment EF, and the distance between points E and F in the left-right direction is L. β = arctan[(Hh) / L].

[0106] Experimental verification revealed that by limiting 0.25≤h / H<1 and 10°≤β≤65°, the airflow can be effectively guided by the first guide surface 3 to achieve the effect of supplementing airflow to the air inlet of the cover.

[0107] It should be noted that the h / H ratio can be any value greater than or equal to 0.25 and less than 1, such as any value among 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, and 0.95.

[0108] β can be any angle between 10° and 65°. Preferably, β is selected from any one of 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, and 65°.

[0109] It should be noted that when the first guide surface 3 adopts a rounded chamfer, the radius of the rounded chamfer is R1. R1 is greater than the length of the line segment connecting points E and F to avoid R1 being too small, which would cause the guide effect of the first guide surface 3 to deviate. When R1 is infinitely large, the first guide surface 3 is a beveled chamfer.

[0110] Furthermore, such as Figure 14 and Figure 15 As shown, the height of the first guide surface 3 gradually decreases from front to back. When the first guide surface 3 is a chamfered surface, it can be said that the first guide surface 3 is inclined relative to the front-back direction and is higher in the front and lower in the back. This setting can increase the lower end height of the front side 2 of the smoke collection shell 200, which is beneficial for cooking fumes to enter the air inlet of the hood.

[0111] It should be noted that when the first guide surface 3 adopts a rounded chamfered surface, the line connecting points E and F above refers to a chord length of the rounded chamfered surface.

[0112] It should be noted that the height of the first guide surface 3 can also be set to remain unchanged along the direction from front to back.

[0113] Airflow simulations were performed on conventional range hoods that do not have a first airflow guide surface 3, as well as on the range hood with a first airflow guide surface 3 provided in this embodiment. Figure 17 The area enclosed by the white dashed line shown represents the negative pressure range during traditional range hood smoke extraction. Figure 19 The area enclosed by the white dashed line shown is the negative pressure range of the range hood provided in this embodiment when it extracts cooking fumes.

[0114] It is quite obvious that, such as Figure 17 and Figure 18 As shown, although external air can be drawn into the hood's air inlet under negative pressure in traditional range hoods, the outer surface 1 and the smoke inlet surface 4 are directly connected or connected via a chamfering process. When air flows to the outer surface 1, the airflow resistance is relatively high. As the air continues to flow towards the hood's air inlet, a large bend is formed, increasing the negative pressure energy consumed by air resistance and thus reducing the negative pressure range of the traditional range hood. Figure 14 and Figure 19 As shown, in this embodiment, the outer side 1 is connected to the smoke inlet end face 4 through the first guide surface 3. The first guide surface 3 guides the air around the smoke collection shell 200 to the air inlet of the hood. The Coanda effect reduces the air flow resistance, ensuring that the air is more smoothly guided into the air inlet of the hood by the first guide surface 3, thereby reducing the consumption of negative pressure, helping the negative pressure to move outward, and thus increasing the range of negative pressure effect.

[0115] like Figure 17 and Figure 19 As shown, compared with traditional range hoods, the negative pressure range of the smoke collection housing 200 in this embodiment is significantly larger, which can allow most of the air to smoothly enter the hood air inlet along the first guide surface 3, ultimately forming a supplementary airflow effect on the hood air inlet, thereby improving the smoke extraction effect of the entire range hood and enhancing the user experience.

[0116] This embodiment employs principles of fluid mechanics and aerodynamics, along with DOE response surface methodology, to design the first guide surface 3. This not only optimizes the appearance of the range hood but also fully utilizes the Coanda effect in fluid mechanics to alter airflow and enhance fume extraction. An optimized slit-type smoke inlet creates a specific negative pressure zone near the inlet, ensuring effective fume extraction. After the range hood's fan starts, the first guide surface 3 alters the airflow direction to create a supplementary airflow effect, while the slit-type smoke inlet reduces the fume diffusion range and utilizes negative pressure for smoke extraction, thus improving extraction efficiency.

[0117] Figure 20 When the smoke collection housing 200 has a first guide surface 3 on both the left and right sides, or when it has no first guide surface 3, the range hood adopts a two-sided surround design, a three-sided suction design, or a W-shaped design. 11 =W 12 The four-sided surround suction design, and W 11 >W 12 The DOE response surface optimization diagram for the four-sided annular suction scheme. Based on... Figure 20 It can be seen that, for any of the above four schemes, the range hood with first guide surfaces 3 on both sides of the smoke collection housing 200 has a better smoke extraction effect than the range hood without first guide surfaces 3 on both sides of the smoke collection housing 200. According to Figure 20 It can also be seen that, with the first guide surface 3 provided on both the left and right sides of the smoke collection shell 200, W is adopted. 11 >W 12 The range hood achieves optimal smoke extraction when using a four-sided surround suction design. It should be noted that... Figure 20 In the diagram, coordinate a = 0 indicates that the smoke collection shell 200 has no first guide surface 3 on either the left or right sides; coordinate a = 1 indicates that the smoke collection shell 200 has a first guide surface 3 on both the left and right sides; coordinate c = 1 indicates a two-sided enclosed design; coordinate c = 2 indicates a three-sided suction design; and coordinate c = 3 indicates a W... 11 =W 12 The four-sided ring suction scheme, with coordinate c = 4 representing W 11 >W 12 The four-sided surround suction design; coordinate P4 indicates the fume extraction effect.

[0118] To better demonstrate the smoke extraction effect of the range hood using the above-mentioned solutions, assuming that the left and right sides of the smoke collection housing 200 are both equipped with first guide surfaces 3, the following measures are taken: Figure 21 Show Figure 20 When the first guide surface 3 is provided on both the left and right sides of the central smoke collection shell 200, the range hood adopts a two-sided surround design, a three-sided suction design, or a W-shaped design. 11 =W12 The four-sided surround suction design, and W 11 >W 12 Comparison of the fume extraction effects of the four-sided surround suction system.

[0119] Figure 21 Scheme A indicates that the smoke collection shell 200 has a first guide surface 3 on both the left and right sides and the smoke inlet is... Figure 4 The smoke extraction effect of the range hood with the two-sided enclosed design shown; Figure 21 Scheme B indicates that the smoke collection shell 200 has a first guide surface 3 on both the left and right sides and the smoke inlet is... Figure 3 The smoke extraction effect of the three-sided suction design shown in the image; Figure 21 Scheme C indicates that the smoke collection shell 200 has a first guide surface 3 on both the left and right sides and the smoke inlet is... Figure 2 As shown in W 11 =W 12 The fume extraction effect of the four-sided surround suction design of the range hood; Figure 21 Scheme D indicates that the smoke collection shell 200 has a first guide surface 3 on both the left and right sides and the smoke inlet is... Figure 8 As shown in W 11 >W 12 The fume extraction effect of the four-sided surround suction design of the range hood is the same as that of the range hood provided in this embodiment; it is evident that the smoke collection housing 200 has a first guide surface 3 on both the left and right sides and W 11 >W 12 When using a four-sided surround suction design, the range hood achieves a smoke extraction efficiency of nearly 90%, making it the most effective smoke extraction system.

[0120] Example 3

[0121] The difference between this embodiment and Embodiment 2 is that, as Figure 22 and Figure 23 As shown, while setting the first guide surface 3, the front side 2 of the smoke collection housing 200 can be connected to the smoke inlet end face 4 via the second guide surface 5. Along the top-to-bottom direction, the second guide surface 5 gradually approaches the central axis of the vertically extending smoke collection channel. It should be noted that... Figure 21 and Figure 22 The first guide surface in the middle is not shown.

[0122] For example, the second guide surface 5 includes a chamfered surface, which is easy to process and has low cost. In other embodiments, the second guide surface 5 may also be a rounded chamfered surface.

[0123] The cross section of the second guide surface 5 intersects with the front side surface 2 at point M, and the second guide surface 5 intersects with the smoke inlet end surface 4 at point N. The angle between the line connecting points M and N and the horizontal plane is γ, 10°≤γ≤65°. The cross section of the second guide surface 5 is perpendicular to the left and right direction of the range hood.

[0124] The second section of the top surface 6 intersects the front side surface 2 at point Q. The vertical distance between point M and point Q is d, and the vertical distance between point N and point Q is D. 0.25≤d / D<1. The second section of the top surface 6 is perpendicular to the left and right direction of the range hood.

[0125] When the first guide surface 3 is set at an angle relative to the front and rear directions, by limiting 0.25≤d / D<1 and 10°≤γ≤65°, it was found through experimental verification that the second guide surface 5 can effectively guide the air to achieve the effect of supplementing the air inlet of the cover.

[0126] It should be noted that the d / D ratio can be any value greater than or equal to 0.25 and less than 1, such as any value among 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, and 0.95. γ can be any angle between 10° and 65°. Preferably, β is selected from any one of 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, and 65°.

[0127] It should be noted that when the second guide surface 5 adopts a rounded chamfer, the line connecting points M and N refers to a chord length of the rounded chamfer. The radius of the rounded chamfer is R2, which is greater than the length of the line segment connecting points M and N to avoid R1 being too small, which would cause a deviation in the guiding effect of the second guide surface 5. When R2 is infinitely large, the second guide surface 5 is a beveled chamfer.

[0128] Figure 24 With the premise that the smoke collection housing 200 has a first guide surface 3 on both the left and right sides, and a second guide surface 5 on the front side of the smoke collection housing 200, and without the second guide surface 5, the range hood adopts a two-sided surround design, a three-sided suction design, or a W-shaped design. 11 =W 12 The four-sided surround suction design, and W 11 >W 12 The DOE response surface optimization diagram for the four-sided annular suction scheme. Based on... Figure 24It can be seen that, assuming that the first guide surface 3 is provided on both the left and right sides of the smoke collection housing 200, for any of the above four schemes, the smoke extraction effect of the range hood is better when the second guide surface 5 is provided on the front side of the smoke collection housing 200 than when the second guide surface 5 is not provided on the front side of the smoke collection housing 200. According to Figure 24 It can also be seen that, with the first guide surface 3 provided on both the left and right sides of the smoke collection shell 200 and the second guide surface 5 provided on the front side of the smoke collection shell 200, W is adopted. 11 >W 12 The range hood achieves optimal smoke extraction when using a four-sided surround suction design. It should be noted that... Figure 24 In the diagram, coordinate b = 0 indicates that the front side of the smoke collection shell 200 does not have a second guide surface 5, coordinate b = 1 indicates that the front side of the smoke collection shell 200 has a second guide surface 5, coordinate c = 1 indicates a two-sided enclosed design, coordinate c = 2 indicates a three-sided suction design, and coordinate c = 3 indicates a W... 11 =W 12 The four-sided ring suction scheme, with coordinate c = 4 representing W 11 >W 12 The four-sided surround suction design; coordinate P4 indicates the fume extraction effect.

[0129] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A smoke collection hood assembly, characterized in that, It includes a smoke collection housing (200) with an air inlet, and a baffle (201) installed on the smoke collection housing (200). The baffle (201) covers at least part of the air inlet to form at least one smoke inlet. The smoke inlet is an elongated hole, and the maximum length of the elongated hole is greater than eight times the maximum width of the elongated hole.

2. The smoke collection hood assembly according to claim 1, characterized in that, The range hood has multiple smoke inlets, including two first smoke inlets (10) and two second smoke inlets (20). The two first smoke inlets (10) are arranged opposite to each other and spaced apart along the front-back direction of the range hood, and the two second smoke inlets (20) are arranged opposite to each other and spaced apart along the left-right direction of the range hood. At least one of the first smoke inlets (10) has a length of L1 along the left-right direction and a width of W1 along the front-back direction, where L1 > 8 * W1; and / or, at least one of the second smoke inlets (20) has a length of L2 along the front-back direction and a width of W2 along the left-right direction, where L2 > 8 * W2.

3. The smoke collection hood assembly according to claim 2, characterized in that, One of the first smoke inlets (10) is a forward smoke inlet, and the other first smoke inlet (10) is a rear smoke inlet. The forward smoke inlet is located in front of the rear smoke inlet along the front-back direction. The width of the forward smoke inlet along the front-back direction is greater than the width of the rear smoke inlet along the front-back direction, or the width of the forward smoke inlet along the front-back direction is less than the width of the rear smoke inlet along the front-back direction.

4. The smoke collection hood assembly according to claim 3, characterized in that, The width W1 of the forward flue along the front-to-back direction includes W 11 50mm≤W 11 ≤70mm; And / or, the width W1 of the rear smoke inlet along the front-rear direction includes W 12 30mm≤W 12 ≤50mm; And / or, 590mm≤L1≤615mm; And / or, 315mm≤L2≤355mm.

5. The smoke collection hood assembly according to claim 2, characterized in that, The cross section of the first smoke inlet (10) and the cross section of the second smoke inlet (20) which is adjacent to it in the circumferential direction of the smoke collection shell (200) are connected or not connected. The cross sections of the first smoke inlet (10) and the second smoke inlet (20) are perpendicular to the air inlet direction of the hood.

6. The smoke collection hood assembly according to any one of claims 1 to 5, characterized in that, The smoke collection housing (200) is provided with a smoke collection channel, one end of which forms the air inlet of the hood. The smoke collection housing (200) includes two outer side surfaces (1) arranged opposite to each other in the left and right direction of the range hood, and a smoke inlet end face (4) with the air inlet of the hood. At least one of the outer surfaces (1) is connected to the smoke inlet end face (4) through a first guide surface (3), and the first guide surface (3) gradually approaches the central axis of the smoke collection channel extending in the vertical direction along the top to bottom direction; and / or, the front surface (2) of the smoke collection housing (200) is connected to the smoke inlet end face (4) through a second guide surface (5), and the second guide surface (5) gradually approaches the central axis of the smoke collection channel extending in the vertical direction along the top to bottom direction.

7. The smoke collection hood assembly according to claim 6, characterized in that, At least one of the outer surfaces (1) is in contact with the smoke inlet end face (4) through a first guide surface (3), wherein the first guide surface (3) includes a chamfered surface or a rounded chamfered surface; And / or, the front side (2) of the smoke collection housing (200) is connected to the smoke inlet end face (4) through the second guide surface (5), the second guide surface (5) including a chamfered surface or a rounded chamfered surface.

8. The smoke collection hood assembly according to claim 6, characterized in that, At least one of the outer surfaces (1) is connected to the smoke inlet end face (4) through a first guide surface (3). The cross section of the first guide surface (3) intersects the outer surface (1) at point E and the cross section of the first guide surface (3) intersects the smoke inlet end face (4) at point F. The angle between the line connecting point E and point F and the horizontal plane is β, 10°≤β≤65°. The cross section of the first guide surface (3) is perpendicular to the front-back direction of the range hood. The end of the smoke collection channel away from the air inlet of the cover extends to the top surface (6) of the smoke collection housing (200). The first cross section of the top surface (6) intersects the outer surface (1) at point P. The vertical distance between point E and point P is h, and the vertical distance between point F and point P is H, 0.25≤h / H<1. The first cross section of the top surface (6) is perpendicular to the front-back direction of the range hood. And / or, the front side (2) of the smoke collection housing (200) is connected to the smoke inlet end face (4) through the second guide surface (5), the cross section of the second guide surface (5) intersects the front side (2) at point M, the second guide surface (5) intersects the smoke inlet end face (4) at point N, the angle between the line connecting the M point and the N point and the horizontal plane is γ, 10°≤γ≤65°, the cross section of the second guide surface (5) is perpendicular to the left and right direction of the range hood; the end of the smoke collection channel away from the air inlet of the cover extends to the top surface (6) of the smoke collection housing (200), the second cross section of the top surface (6) intersects the front side (2) at point Q, the vertical distance between the M point and the Q point is d, the vertical distance between the N point and the Q point is D, 0.25≤d / D<1, the second cross section of the top surface (6) is perpendicular to the left and right direction of the range hood.

9. The smoke collection hood assembly according to any one of claims 1 to 5, characterized in that, The smoke collection housing (200) includes two outer side surfaces (1) arranged opposite to each other in the left-right direction of the range hood, and a smoke inlet end face (4) with the air inlet of the cover. At least one of the outer surfaces (1) is connected to the smoke inlet end face (4) via a first guide surface (3). The cross section of the first guide surface (3) intersects the outer surface (1) at point E, and the cross section of the first guide surface (3) intersects the smoke inlet end face (4) at point F. The cross section of the first guide surface (3) is perpendicular to the front-back direction of the range hood. When the first guide surface (3) includes a rounded chamfer, the radius of the rounded chamfer is R1, and R1 is greater than the length of the line segment connecting point E and point F; and / or, The front side (2) of the smoke collection housing (200) is connected to the smoke inlet end face (4) through the second guide surface (5). The cross section of the second guide surface (5) intersects the front side (2) at point M and the smoke inlet end face (4) at point N. The cross section of the second guide surface (5) is perpendicular to the left and right direction of the range hood. When the second guide surface (5) includes a rounded chamfer, the radius of the rounded chamfer is R2, which is greater than the length of the line segment connecting the M point and the N point.

10. A range hood, characterized in that, Includes a power structure (300) and a smoke hood assembly as described in any one of claims 1 to 9, wherein the outlet of the smoke collection channel of the smoke collection housing (200) is connected to the power structure (300).

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