Range hood

Abstract

The utility model discloses a range hood, which comprises a fan frame, a range hood body, a range hood cover and a range hood cover, the exhaust fume collecting hood is connected with the fan frame, and the exhaust fume collecting hood is provided with a front face, a back face and an exhaust fume inlet; the smoke baffle is arranged on the smoke collecting hood and has a first state and a second state, the front face of the smoke collecting hood is covered with the smoke baffle in the first state, a smoke gathering cavity is formed by the smoke baffle and the front face of the smoke collecting hood in the second state, and the smoke inlet is located in the smoke gathering cavity; the fresh air system is located in the fan frame; in the first state, an air outlet of the fresh air system is formed in the fan frame, and in the second state, the air outlet is completely located in the range limited by the smoke baffle on the horizontal plane projection.

Description

Technical Field

[0001] The utility model relates to an oil fume purification device, in particular to an oil fume extractor. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work on the principle of fluid dynamics, using a centrifugal fan installed inside the range hood to absorb and exhaust oil fumes, and using a filter to filter out some grease particles.

[0003] When using a range hood in the kitchen, negative pressure will be generated in the relatively closed kitchen. When the negative pressure reaches a certain level, it will make it impossible to extract the fumes, resulting in a decrease in the fumes extraction effect. In addition, it will cause outdoor polluted air to squeeze into the kitchen through the gaps in the doors and windows, causing secondary pollution, and will also cause odors from sewers to flow back into the kitchen, deteriorating the kitchen air quality. At the same time, the oxygen content in the kitchen will also decrease, reducing the combustion efficiency of the burner.

[0004] At present, a common method is to add a fresh air system to the range hood to introduce outdoor fresh air into the kitchen, thereby solving the negative pressure problem in the kitchen and improving the air quality in the kitchen. The introduced fresh air can also form a wind curtain to reduce the escape of oil smoke. For example, a range hood disclosed in the Chinese patent application number 201920989815.5 of the applicant includes a fume hood, a chassis and a fresh air system. The fume hood is provided with an air inlet. The fresh air system includes a second fan that draws air from the outside of the range hood and discharges it outside the chassis. The fume hood is provided with a fresh air inlet connected to the air outlet of the second fan, and the fresh air inlet is located in front of the air inlet.

[0005] The above-mentioned existing range hood solves the negative pressure condition in the closed kitchen by providing a fan for supplying fresh air, and on the other hand forms a more efficient and stable wind path. However, since the fresh air inlet is located at the front side of the air inlet, the fresh air blown out from the fresh air inlet is easily re-sucked into the air inlet together with the oil smoke in an unobstructed environment, thereby affecting the air supply effect. Moreover, since the fresh air is sucked in together with the oil smoke, the amount of exhaust oil smoke will be reduced, affecting the oil fume extraction effect. If the amount of exhaust oil smoke is to be ensured to remain unchanged, the fan gear needs to be increased, resulting in increased energy consumption and noise. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a range hood to address the deficiencies in the above-mentioned prior art, thereby ensuring the effect of fresh air supply while avoiding affecting the effect of extracting fume.

[0007] The first technical solution adopted by the utility model to solve the above technical problems is: a range hood, comprising:

[0008] A fan rack, with a fan arranged inside;

[0009] A smoke collecting hood connected to the fan frame, the smoke collecting hood having a front side, a back side and a smoke inlet;

[0010] a smoke baffle, disposed on the smoke collecting hood and having a first state and a second state, wherein in the first state, the smoke baffle covers the front of the smoke collecting hood, and in the second state, the smoke baffle and the front of the smoke collecting hood form a smoke collecting cavity, and the smoke inlet is located in the smoke collecting cavity; and

[0011] A fresh air system is located in the fan rack;

[0012] An angle β is formed between the front of the smoke hood and the back of the smoke hood, and β≤30° is satisfied. The height of the front of the smoke hood is h1, and h1≥450mm is satisfied. The front of the smoke hood forms a guide surface in the area below the smoke inlet. The height of the guide surface is h2, and h2≥220mm is satisfied. When the smoke baffle is in the second state, the angle between the smoke baffle and the back of the smoke hood is α, and α>β is satisfied.

[0013] The smoke inlet has a first smoke inlet and a second smoke inlet, the upper edge of the first smoke inlet has a first high point; the upper edge of the second smoke inlet has a second high point, on the projection of a first vertical plane parallel to the back of the smoke hood, the line between the first high point and the central axis of the impeller of the fan is the first line, the line between the second high point and the central axis of the impeller of the fan is the second line, the angle between the first line and the second line is θ1, the central axis of the impeller is located in a second vertical plane perpendicular to the horizontal plane, the angle between the first line and the second vertical plane is θ2, the angle between the second line and the second vertical plane is θ3, and θ1≤30°, or θ2≤15° and / or θ3≤20° are satisfied;

[0014] The first smoke inlet has a first annular wall on its periphery, and the second smoke inlet has a second annular wall on its periphery, the first annular wall encloses a first smoke inlet cavity, and the second annular wall encloses a second smoke inlet cavity, and the entrance area of ​​each smoke inlet cavity is larger than the area of ​​the corresponding smoke inlet;

[0015] Features:

[0016] The smoke baffle is provided with a shell, the shell constituting a part of the side wall defining the smoke collecting chamber, and in the second state, the highest point of the side surface of the shell close to the smoke inlet is lower than the highest point of the smoke baffle, and the highest point of the side surface of the shell close to the smoke inlet corresponds to the front side of the smoke collecting hood, and the corresponding position is higher than the position of the smoke inlet;

[0017] In the first state, at least 90% of the shell in the thickness direction is located outside the smoke collecting hood; the area of ​​the smoke inlet is smaller than the area of ​​the shell near the smoke inlet, and the back side of the shell near the smoke inlet completely covers the smoke inlet;

[0018] The fan frame is provided with an air outlet for the fresh air system. In the second state, in horizontal plane projection, the air outlet is completely within the range defined by the smoke baffle.

[0019] By limiting the height of the front face and the guide surface of the smoke hood, when the front face height is greater, the lower end of the smoke hood will come into contact with the oil smoke earlier when the installation height is fixed, and the oil smoke can enter the smoke inlet earlier through the wall attachment effect, and the higher the height of the guide surface, the better the wall attachment effect, and the oil smoke diversion path can also be increased, thereby avoiding smoke escaping before reaching the smoke inlet; the smaller the angle formed between the front and back faces of the smoke hood, the better, and the smaller the angle, the thinner the smoke hood can be, and the less cooking space is occupied; the larger the angle between the smoke baffle plate and the back face of the smoke hood when it is opened, the better, and the larger the angle, the larger the smoke collection area of ​​the smoke collection chamber, thereby increasing the amount of oil smoke in the smoke collection chamber, reducing the escape of oil smoke, and the better the oil fume absorption effect; when there are two smoke inlets, the high points of the upper edges of the two smoke inlets are made as close as possible to the central axis of the impeller of the fan, thereby reducing the amount of oil smoke entering The path from the smoke inlet to the fan is shortened, thereby improving the oil fume absorption effect; an annular wall is formed on the outer periphery of the smoke inlet, so that the entrance area of ​​the smoke inlet cavity surrounded by the annular wall is larger than the area of ​​the corresponding smoke inlet, thereby there can be an acceleration process when the oil fume enters the smoke inlet cavity until it reaches the smoke inlet, thereby promoting the rapid inhalation of oil fume; a shell for arranging electronic control devices (control panel, lighting device, etc.) is provided on the back of the smoke baffle, so that the highest point of the side surface of the shell close to the smoke inlet is higher than the smoke inlet, so that the oil fume can be pressed down by the shell when rising upwards and change its path to enter the smoke inlet, thereby reducing the upward escape of oil fume; by making most of the shell on the back of the smoke baffle exposed to the outside of the smoke hood when the machine is turned off, it can be avoided that the shell compresses the space inside the smoke hood, so that the smoke hood can be thinner, and the oil fume channel in the smoke hood will not be squeezed, ensuring smooth air intake.

[0020] By setting up a fresh air system and ensuring that the air outlet of the fresh air system is completely blocked by the smoke shield when the smoke shield is opened, the fresh air blown out by the fresh air system can be fully used to compensate for negative pressure, form a wind curtain, etc., to prevent the fresh air blown out from the air outlet from being sucked into the smoke inlet, thereby reducing the discharge of oil fume and ensuring that the air volume for absorbing oil fume remains unchanged. The oil fume absorption effect can be ensured without increasing the fan gear, and an increase in noise is also avoided.

[0021] Preferably, the air outlet of the fresh air system is arranged at the bottom of the fan frame to avoid direct blowing on the user and to avoid the air not being able to diffuse well into the kitchen due to blowing in only one direction horizontally.

[0022] Furthermore, in the second state, in the depth direction, the distance from the outermost side of the air outlet to the outermost side of the smoke shield is d6, and the distance from the outermost side of the smoke shield to the innermost side is d7, and d6 / d7≥1 / 8 is satisfied. Therefore, under the premise of ensuring that the fresh air is not sucked into the smoke inlet, the closer the fresh air outlet is to the outside, the better, so that the path for the fresh air to be blown out can be as short as possible.

[0023] Furthermore, the range hood further comprises an oil cup, which is arranged below the smoke inlet, and a cover plate is arranged on the front of the smoke hood at the oil cup, and the cover plate constitutes a part of the guide surface. By arranging the oil cup, the oil flowing down the inner wall of the smoke hood or dripping from the fan can be collected, and by arranging the cover plate, the oil cup is avoided from being exposed, thereby realizing a hidden design of the oil cup.

[0024] To further ensure that the oil cup is exposed and at the same time make the height of the oil cup within an ideal range, to avoid the need to frequently pour the oil due to its height being too small, and to avoid the space of the smoke inlet being occupied due to its height being too large, the cover plate completely covers the oil cup, and the height of the cover plate is h3, and the value range of h3 / h1 is 0.1-0.3.

[0025] Furthermore, in the first state, the smoke shield covers the cover plate and exposes the lower surface of the front side of the smoke hood, the height of the lower surface is h5, and the value range of h5 / h1 is 0.02 to 0.2. If the lower surface is exposed too much, the negative pressure area will be too high, affecting the oil fume absorbing effect, and if the lower surface is exposed too little, the smoke shield will be too long and block the line of sight.

[0026] Furthermore, the first smoke collecting chamber is formed between the part of the smoke baffle under the shell and the front of the smoke collecting hood, and the second smoke collecting chamber is formed between the front side of the shell close to the smoke collecting hood and the front of the smoke collecting hood. The depth of the first smoke collecting chamber at any position is d1, and the depth of the second smoke collecting chamber at any position is d2, and the value range of d1 / d2 is 1.05 to 1.3. As a result, the smoke collecting range is large in the first smoke collecting chamber, and as the oil smoke rises upward, the depth of the smoke collecting chamber decreases, and the oil smoke is accelerated during the rising process and can be quickly sucked into the smoke inlet.

[0027] Furthermore, in the second state, the horizontal distance between the highest point of the shell near the smoke inlet and the front of the smoke hood is less than 20 mm, 15 mm or 10 mm, so that the gap between the shell and the smoke inlet is kept within a small range, reducing the escape of oil smoke through the gap when rising upward.

[0028] Further, in the vertical direction, the distance between the highest point of the side of the shell near the smoke inlet and the first highest point of the first smoke inlet is D, the height of the first smoke inlet is h4, and the value range of D / h4 is 0.2 to 0.7; and / or the distance between the highest point of the side of the shell near the smoke inlet and the second highest point of the second smoke inlet is D, the height of the second smoke inlet is h4, and the value range of D / h4 is 0.2 to 0.7. Reduce the height difference between the highest point of the shell and the highest point of the smoke inlet, so that the oil smoke can enter the smoke inlet through a shorter path after being pressed down by the shell, avoiding the escape of oil smoke due to too long a path.

[0029] Furthermore, the vertical distance between the lowest point of the lower edge of the first smoke inlet and the second smoke inlet to the lower end of the smoke hood is d3, and satisfies d3≥1 / 2*h1. Since there is a certain angle between the front and back of the smoke hood, the lowest point of the smoke inlet is at a certain height, so that the thickness of the cavity formed in the smoke hood corresponding to the smoke inlet is larger, thereby reducing the noise caused by airflow.

[0030] Furthermore, the fan has an air inlet, and the space between the air inlet and the corresponding side wall of the fan frame constitutes an air inlet channel. In the horizontal plane projection, at least 50% of the depth of the smoke inlet falls into the air inlet channel, so that after the oil smoke enters the smoke hood from the smoke inlet, it can directly rise upward and be sucked into the fan, thereby reducing the flow path of the oil smoke and realizing direct suction and discharge.

[0031] Furthermore, the fan has an air inlet, and the space between the air inlet and the corresponding side walls of the fan frame constitutes an air inlet channel. In the horizontal plane projection, the smoke inlet is completely immersed in the air inlet channel in depth, so that after the oil smoke enters the smoke hood from the smoke inlet, it can directly rise upward and be sucked into the fan, thereby reducing the flow path of the oil smoke and realizing direct suction and discharge.

[0032] The second technical solution adopted by the utility model to solve the above technical problem is: a range hood, comprising:

[0033] A fan rack, with a fan arranged inside;

[0034] A smoke collecting hood connected to the fan frame, the smoke collecting hood having a front side, a back side and a smoke inlet;

[0035] a smoke baffle, disposed on the smoke collecting hood and having a first state and a second state, wherein in the first state, the smoke baffle covers the front of the smoke collecting hood, and in the second state, the smoke baffle and the front of the smoke collecting hood form a smoke collecting cavity, and the smoke inlet is located in the smoke collecting cavity; and

[0036] The fresh air system is located in the fan rack; it is characterized by:

[0037] The air outlet of the fresh air system is arranged on the fan frame. In the second state, in horizontal plane projection, the air outlet is completely within the range defined by the smoke baffle.

[0038] By setting up a fresh air system and ensuring that the air outlet of the fresh air system is completely blocked by the smoke shield when the smoke shield is opened, the fresh air blown out by the fresh air system can be fully used to compensate for negative pressure, form a wind curtain, etc., to prevent the fresh air blown out from the air outlet from being sucked into the smoke inlet, thereby reducing the discharge of oil fume and ensuring that the air volume for absorbing oil fume remains unchanged. The oil fume absorption effect can be ensured without increasing the fan gear, and an increase in noise is also avoided.

[0039] Preferably, the air outlet of the fresh air system is arranged at the bottom of the fan frame to avoid direct blowing on the user and to avoid the air not being able to diffuse well into the kitchen due to blowing in only one direction horizontally.

[0040] Furthermore, in the second state, in the depth direction, the distance from the outermost side of the air outlet to the outermost side of the smoke shield is d6, and the distance from the outermost side of the smoke shield to the innermost side is d7, and d6 / d7≥1 / 8 is satisfied. Therefore, under the premise of ensuring that the fresh air is not sucked into the smoke inlet, the closer the fresh air outlet is to the outside, the better, so that the path for the fresh air to be blown out can be as short as possible.

[0041] Furthermore, the front of the smoke hood forms a guide surface in the area below the smoke inlet, the height of the front of the smoke hood is h1, and satisfies h1≥450mm, and the height of the guide surface is h2, and satisfies h2≥220mm. By limiting the height of the front of the smoke hood and the guide surface, when the height of the front is greater, the lower end of the smoke hood will contact the oil smoke earlier when the installation height is fixed, and the oil smoke can enter the smoke inlet earlier through the wall attachment effect, and the higher the height of the guide surface, the better the wall attachment effect, and the guide path of the oil smoke can also be increased, thereby avoiding the smoke from escaping before reaching the smoke inlet.

[0042] Furthermore, in the first state, the height of the lower surface of the front of the smoke hood exposed below the smoke baffle is h5, and the value range of h5 / h1 is 0.02 to 0.2. If the lower surface is exposed too much, the negative pressure area will be too high, affecting the oil fume absorption effect, and if the lower surface is exposed too little, the smoke baffle will be too long and block the line of sight.

[0043] Furthermore, a shell is provided on the smoke baffle, and the shell constitutes a part of the side wall defining the smoke collecting cavity, and in the second state, the highest point of the side surface of the shell close to the smoke inlet is lower than the highest point of the smoke baffle;

[0044] A first smoke collecting chamber is formed between the part of the smoke baffle plate under the shell and the front face of the smoke collecting hood, a second smoke collecting chamber is formed between the front side of the shell close to the smoke collecting hood and the front face of the smoke collecting hood, the depth of the first smoke collecting chamber at any position is d1, the depth of the second smoke collecting chamber at any position is d2, and the value range of d1 / d2 is 1.05 to 1.3.

[0045] A shell for arranging electronic control components (control panel, lighting device, etc.) is arranged on the back of the smoke baffle, so that the highest point of the side surface of the shell close to the smoke inlet is higher than the smoke inlet, so that the oil smoke can be pressed down by the shell when rising upwards and change its path to enter the smoke inlet, thereby reducing the upward escape of the oil smoke; the smoke collecting chamber is divided by the shell, thereby the smoke collecting range is large at the first smoke collecting chamber, and as the oil smoke rises upward, the depth of the smoke collecting chamber decreases, the oil smoke is accelerated during the rising process, and can be quickly sucked into the smoke inlet.

[0046] Furthermore, in the vertical direction, the distance between the highest point of the side surface of the shell near the smoke inlet and the highest point of the upper edge of the smoke inlet is D, the height of the smoke inlet is h4, and the value range of D / h4 is 0.2 to 0.7. Thus, the height difference between the highest point of the shell and the highest point of the smoke inlet is reduced, so that the oil smoke can enter the smoke inlet through a shorter path after being pressed down by the shell, avoiding the escape of oil smoke due to a long path.

[0047] Furthermore, the vertical distance between the lowest point of the lower edge of the smoke inlet and the lower end of the smoke hood is d3, the height of the front of the smoke hood is h1, and d3≥1 / 2*h1 is satisfied. Since there is a certain angle between the front and back of the smoke hood, the lowest point of the smoke inlet is at a certain height, so that the thickness of the cavity formed in the smoke hood corresponding to the smoke inlet is larger, thereby reducing the noise caused by airflow.

[0048] Furthermore, the fan has an air inlet, and the space between the air inlet and the corresponding side wall of the fan frame constitutes an air inlet channel, and in the horizontal plane projection, at least 50% of the depth of the smoke inlet falls into the air inlet channel. Therefore, after the oil smoke enters the smoke collecting hood from the smoke inlet, it can directly rise upward and be sucked into the fan, reducing the flow path of the oil smoke and realizing direct suction and discharge.

[0049] Compared with the prior art, the advantages of the present invention are as follows: by limiting the height of the front face and the guide surface of the smoke hood, when the front face height is greater, the lower end of the smoke hood will contact the oil smoke earlier when the installation height is fixed, and the oil smoke can enter the smoke inlet earlier through the wall attachment effect, and the higher the height of the guide surface, the better the wall attachment effect, and the oil smoke diversion path can also be increased, thereby avoiding smoke escaping before reaching the smoke inlet; the smaller the angle formed between the front and back faces of the smoke hood, the better, and the smaller the angle, the thinner the smoke hood can be, and the less cooking space is occupied; the larger the angle between the smoke baffle plate and the back face of the smoke hood when it is opened, the better, and the larger the angle, the larger the smoke collection area of ​​the smoke collection chamber, thereby increasing the amount of oil smoke in the smoke collection chamber, reducing the escape of oil smoke, and the better the oil fume absorption effect; when there are two smoke inlets, the high points of the upper edges of the two smoke inlets are as close as possible to the impeller center axis of the fan. The smoke exhaust fan has a plurality of air intake ports, and the plurality of air intake ports have ...

[0050] By setting up a fresh air system, and making sure that when the smoke shield is opened, the air outlet of the fresh air system is completely blocked by the smoke shield, the fresh air blown out by the fresh air system can be fully used to compensate for negative pressure, form a wind curtain, etc., to prevent the fresh air blown out from the air outlet from being sucked into the smoke inlet, thereby reducing the amount of oil smoke discharged, ensuring that the air volume for oil smoke absorption remains unchanged, and ensuring the oil smoke absorption effect without increasing the fan gear, and also avoiding the increase of noise;

[0051] On the premise of ensuring that the fresh air is not sucked into the smoke inlet, the fresh air outlet should be as close to the outside as possible, so that the path for the fresh air to be blown out can be as short as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic diagram of the range hood in the closed state of the first embodiment of the utility model;

[0053] Figure 2 A side view of the range hood in a closed state according to the first embodiment of the utility model;

[0054] Figure 3It is a cross-sectional view (side view) of the range hood in the closed state according to the first embodiment of the utility model;

[0055] Figure 4 This is a cross-sectional view of the range hood in the closed state of the first embodiment of the utility model (section and Figure 3 same, stereogram);

[0056] Figure 5 This is a schematic diagram of a hidden smoke baffle of a range hood according to a first embodiment of the utility model;

[0057] Figure 6 A schematic diagram of a range hood with a hidden smoke baffle and a housing according to a first embodiment of the utility model;

[0058] Figure 7 It is a schematic diagram of a range hood with a hidden smoke baffle, a housing and a cover plate according to a first embodiment of the utility model;

[0059] Figure 8 A schematic diagram of a smoke baffle and a housing of a range hood according to a first embodiment of the utility model;

[0060] Fig. 9 This is a schematic diagram of the range hood in the first embodiment of the utility model in an open state;

[0061] Fig.10 A side view of the range hood in the first embodiment of the utility model in an open state;

[0062] Fig.11 A cross-sectional view of the range hood in the first embodiment of the utility model in an open state;

[0063] Fig.12 A schematic diagram of a range hood according to a second embodiment of the present utility model;

[0064] Fig.13 This is a schematic diagram of the installation of the air guide cover of the range hood on the smoke baffle plate according to the second embodiment of the utility model;

[0065] Fig.14 for Fig.13 Enlarged view of part I;

[0066] Fig.15 It is a schematic diagram of a cover body of a range hood air guide cover of a second embodiment of the utility model;

[0067] Fig.16 It is a schematic diagram of a first plate body of a range hood air guide cover according to a second embodiment of the utility model;

[0068] Fig.17 This is a schematic diagram of the installation of the air guide cover of the range hood on the smoke baffle plate according to the third embodiment of the utility model;

[0069] Fig.18 This is a schematic exploded view of the air guide cover of the range hood according to the third embodiment of the utility model. DETAILED DESCRIPTION

[0070] Embodiments of the present utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions.

[0071] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present utility model can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0072] Embodiment 1

[0073] See also Figure 1 to Figure 4 A range hood comprises a fume hood 1, a fan frame 2 arranged on the fume hood 1, and a fan 3 arranged in the fan frame 2 (the fan is not fully shown in the figure).

[0074] The smoke hood 1 has a smoke inlet, and the fan frame 2 is connected to the smoke hood 1. For example, the bottom of the fan frame 2 can be connected to the top of the smoke hood 1, and the smoke inlet is in fluid communication with the fan frame 2, so that the oil smoke can be sucked from the smoke inlet into the fan frame 2 and discharged through the fan 3. The smoke hood 1 has a front side 11 and a back side 12 opposite to each other. In the use state, the front side 11 is the side facing the user, and the back side 12 is the side away from the user and close to the wall where it is installed. The front side 11 of the smoke hood 1 gradually tilts backward from top to bottom, and the back side 12 of the smoke hood 1 is roughly vertically extended. An angle β is formed between the front side 11 and the back side 12 of the smoke hood 1, and β≤30°, more preferably 5°≤β≤20°. The smaller β is, the better, and the smaller it is, the thinner the smoke hood 1 is, and the less cooking space is occupied. The angle between the front side 11 of the smoke hood 1 and the horizontal plane is β'. The height of the front face 11 (the dimension in the vertical direction, i.e. the dimension in the direction perpendicular to the horizontal plane, the height has the same meaning hereinafter) is h1, and satisfies h1≥450mm. The front face 11 of the smoke hood 1 corresponds to the area below the smoke inlet, which is constituted as a guide surface 111. The height of the guide surface 111 (the dimension in the vertical direction) is h2, and satisfies h2≥220mm. The greater the height of the front face 11 of the smoke hood 1, the earlier the lower end of the smoke hood 1 will contact the oil smoke when the installation height is fixed, and the oil smoke can enter the smoke inlet earlier through the wall attachment effect. The higher the height of the guide surface 111, the better the effect of the wall attachment effect, and the oil smoke diversion path can also be increased, thereby avoiding smoke escaping before reaching the smoke inlet.

[0075] The fan 3 includes an impeller (not shown in the figure, which is the prior art). The impeller has an axis, which is denoted as the impeller center axis X. The impeller center axis X extends forward and backward, and has an air inlet 31 facing backward. The space between the air inlet 31 and the rear side wall of the fan frame 2 constitutes an air inlet channel 32. In the horizontal plane projection, at least 50% of the smoke inlet falls into the air inlet channel 32 in depth, or the smoke inlet falls completely into the air inlet channel 32 in depth. The depth here refers to the dimension in the front-to-back direction relative to the user, that is, Fig.11 As shown by the arrow Y in the middle, any smoke inlet meets the above-mentioned limitation. Therefore, after the oil smoke enters the smoke collecting hood 1 from the smoke inlet, it can directly rise upward and be sucked into the fan 3, reducing the flow path of the oil smoke and realizing direct suction and discharge.

[0076] Recombination Figure 4 and 6In the present embodiment, the smoke inlet has a first smoke inlet 131 and a second smoke inlet 132, and the first smoke inlet 131 and the second smoke inlet 132 are arranged at intervals on the left and right, and the impeller center axis X of the fan 3 extends front and back. In the horizontal plane projection, the first smoke inlet 131 is located on the left side of the impeller center axis X, and the second smoke inlet 132 is located on the right side of the impeller center axis X. The first smoke inlet 131 and the second smoke inlet 132 can be symmetrical or asymmetrical relative to the impeller center axis X of the fan 3. The upper edge of the first smoke inlet 131 has a first high point A, which is the highest point of the upper edge of the first smoke inlet 131, and the upper edge of the second smoke inlet 132 has a second high point A', which is the highest point of the upper edge of the second smoke inlet 132. The two high points can be located at the same height or at different heights. On a first vertical plane S1 (a vertical plane extending left and right) parallel to the back surface 12, Figure 6 In the projection of the paper surface shown in FIG. 1 , the line between the first high point A and the impeller center axis X is the first line L1, and the line between the second high point A' and the impeller center axis X is the second line L2. The angle between the first line L1 and the second line L2 is θ1; the impeller center axis X is located in the second vertical plane S2 perpendicular to the horizontal plane, the first vertical plane S1 and the second vertical plane S2 are perpendicular to each other, the angle between the first line L1 and the vertical plane of the second vertical plane S2 is θ2, the angle between the second line L2 and the second vertical plane S2 is θ3, and θ1≤30°, or θ2≤15° and / or θ3≤20° are satisfied.

[0077] The vertical distance between the lowest point of the lower edge of the first smoke inlet 131 and the second smoke inlet 132 and the lower end of the smoke hood 1 is d3, and d3≥1 / 2*h1 is satisfied. The lowest point here refers to the lower point of the lowest point of the lower edge of the first smoke inlet 131 and the lowest point of the lower edge of the second smoke inlet 132. If the two lowest points are in the same position, any lowest point can be taken. The closer the lowest points of the first smoke inlet 131 and the second smoke inlet 132 are to the top, the thicker the cavity formed inside the smoke hood 1 at the smoke inlet is, and the smaller the noise is.

[0078] The outer periphery of the first smoke inlet 131 has a first annular wall 141, and the outer periphery of the second smoke inlet 132 has a second annular wall 142. The first annular wall 141 has a certain depth (dimension in the front-to-back direction), and the second annular wall 142 also has a certain depth (dimension in the front-to-back direction). Thus, the first annular wall 141 encloses a first smoke inlet chamber 151, and the second annular wall 142 encloses a second smoke inlet chamber 152. On the oil fume flow path, the first smoke inlet chamber 151 is located upstream of the first smoke inlet 131, and the second smoke inlet chamber 152 is located upstream of the second smoke inlet 132. On the oil fume flow path, the caliber of the first smoke inlet chamber 151 can be gradually reduced, and the caliber of the second smoke inlet chamber 152 can also be gradually reduced. The entrance area of ​​the first smoke inlet chamber 151 is larger than the area of ​​the first smoke inlet 131, and the entrance area of ​​the second smoke inlet chamber 152 is larger than the area of ​​the second smoke inlet 132. The entrance area of ​​each smoke inlet chamber here refers to the area of ​​the opening on the side of each smoke inlet chamber that first contacts the oil fume, that is, Figure 6 The area of ​​the front opening of each smoke inlet cavity shown in the figure is the area of ​​the transition interface between each smoke inlet and the corresponding smoke inlet cavity. The first annular wall 141 and the second annular wall 142 can be formed by partially recessing the front surface 11 toward the inside of the smoke collecting hood 1, that is, the two annular walls can be integrated with the front surface 11, or the two annular walls can be independent components connected to the front surface 11.

[0079] The range hood further comprises a smoke baffle 4, which is arranged on the smoke collecting hood 1 and has a first state and a second state. In the first state, the smoke baffle 4 covers the front side 11 of the smoke collecting hood 1, that is, Figures 1 to 4 In the second state, the smoke baffle 4 and the front face 11 of the smoke collecting hood 1 form a smoke collecting chamber Q, and the smoke inlet is located in the smoke collecting chamber Q, that is, Figures 9-11 In the open state shown, at this time, the angle between the smoke baffle 4 and the back surface 12 of the smoke collecting hood 1 is α, and α>β is satisfied. The larger α is, the better. The larger α is, the larger the smoke collecting area of ​​the smoke collecting cavity Q is, so that the amount of oil smoke in the smoke collecting cavity Q is increased, and the oil smoke escape is reduced, and the oil smoke absorption effect is better.

[0080] See also Fig.11 , the length of the smoke baffle 4 is L. In the second state when the smoke baffle 4 is open, the vertical distance from the lower edge E of the smoke baffle 4 to the front face 11 of the smoke hood 1 is d4, the angle between the smoke baffle 4 and the front face 11 of the smoke hood 1 is γ, L*sinγ=d4', and it satisfies: d4>L*sinγ, that is, at this time, the upper end of the smoke baffle 4 is not close to the front face 11 of the smoke hood 1, but is located in front of the front face 11 of the smoke hood 1, so that the negative pressure area expands outward. In the first state, the vertical distance from the lower edge E of the smoke baffle 4 to the front face 11 of the smoke hood 1 is d5 (in Figure 3As shown in [reference], and it satisfies \(0 < d5 \leq d4 - L * \sin\gamma\). In this way, when in the closed state, the smoke baffle 4 folds up and closely adheres to the smoke collecting hood 1, reducing the occupied space of the whole machine. In addition, it also satisfies that the value range of \(\beta' / \gamma\) is \(0.5 - 1\). The smaller the inclination angle of the front surface 11 of the smoke collecting hood 1, the thinner the whole machine, and the smaller the opening angle required for the smoke baffle 4 to meet the smoke gathering effect.

[0081] See Figure 5 、 Figure 8 、 Fig.10 and Fig.11 , a housing 5 is provided on the side of the smoke baffle 4 facing the inside of the smoke collecting hood 1. The housing 5 constitutes a part of the side wall that defines the smoke gathering cavity Q. The space formed by the housing 5 and the smoke baffle 4 can usually be used to arrange a control panel, a lighting device, etc. In the second state when the smoke baffle 4 is opened, the highest point C of the side surface of the housing 5 near the smoke inlet is lower than the highest point B of the smoke baffle 4, and the highest point C of the side surface of the housing 5 near the smoke inlet corresponds to the front surface 11 of the smoke collecting hood 1, and this corresponding position is higher than the smoke inlet. Thus, the oil fume rising in the smoke gathering cavity Q can be pressed downward to make it enter the smoke inlet, reducing the upward escape of the oil fume. At this time, the horizontal distance between the highest point C and the front surface 11 of the smoke collecting hood 1 is d8, and it satisfies that d8 is less than 20 mm, 15 mm or 10 mm. The smaller the distance, the smaller the gap between the housing 5 and the front surface 11 of the smoke collecting hood 1, and the better the effect of preventing smoke leakage. Preferably, d8 is less than 5 mm. See Figure 2 and Figure 3 , in the first state, at least 90% of the housing 5 in the thickness direction ( Figure 3 shown as being close to the left - right direction in [reference]) is located outside the smoke collecting hood 1. More preferably, the whole housing 5 in the thickness direction is located outside the smoke collecting hood 1. Thus, in the first state when the smoke baffle 4 is closed, most of the housing 5 does not enter the inside of the smoke collecting hood 1. Therefore, it will not compress the space inside the smoke collecting hood 1, enabling the smoke collecting hood 1 to be thinner, and also ensuring that the oil fume channel inside the smoke collecting hood 1 will not be squeezed, ensuring smooth air intake. See Figure 5 , the sum of the areas of the first smoke inlet 131 and the second smoke inlet 132 is smaller than the area of the side surface of the housing 5 near the smoke inlet, and the back surface of the housing 5 on the side of the smoke inlet completely covers the first smoke inlet 131 and the second smoke inlet 132 (here it means that the projection of the housing 5 on the plane of the outer edge of the housing 5 facing the smoke inlet covers the smoke inlet).

[0082] In the vertical direction, the distance between the highest point C of the side surface of the housing 5 near the smoke inlet and the first highest point A of the first smoke inlet 131 is D, the height of the first smoke inlet 131 is h4, and it satisfies that the value range of D / h4 is \(0.2 - 0.7\). The second smoke inlet 132 is the same by analogy.

[0083] Since the shell 5 is provided, the above-mentioned smoke collecting chamber Q may include a first smoke collecting chamber Q1 and a second smoke collecting chamber Q2, wherein the space formed between the portion of the smoke baffle 4 located below the shell 5 and the front face 11 of the smoke collecting hood 1 is the above-mentioned first smoke collecting chamber Q1, and the space formed between the side of the shell 5 close to the front face 11 of the smoke collecting hood 1 and the front face 11 of the smoke collecting hood 1 is the above-mentioned second smoke collecting chamber Q2, and the boundaries of the smoke collecting chambers are shown by dotted lines M1, M2 and M3. The depth of the first smoke collecting chamber Q1 at any position ( Fig.10 The dimension in the left and right direction shown in the figure is d1, and the depth of any position of the second smoke collecting chamber Q2 is ( Fig.10 The left and right directions shown in the figure are d2, and the value range of d1 / d2 is greater than 1. More preferably, the value range of d1 / d2 is 1.05-1.3. As a result, the smoke collection range is large in the first smoke collection chamber Q1, and as the oil smoke rises upward, the depth of the smoke collection chamber decreases, and the oil smoke is accelerated during the rising process and can be quickly sucked into the smoke inlet.

[0084] See also Figure 7 The range hood further comprises an oil cup 6, which is arranged below the smoke inlet, that is, in this embodiment, there are two oil cups 6, one corresponding to each of the first smoke inlet 131 and the second smoke inlet 132, which can be used to collect the oil flowing down the inner wall of the smoke hood 1 and the oil dripping from the fan 3. A cover plate 112 is arranged at the front 11 of the smoke hood 1 corresponding to the oil cup 6, and the cover plate 112 constitutes a part of the guide surface 111, and the cover plate 112 can completely cover the oil cup 6. Figure 3 , the height of the cover plate 112 is h3, and the value range of h3 / h1 is 0.1-0.3. In the first state, the smoke baffle 4 covers the cover plate 112, and the height of the lower surface of the front 11 of the smoke hood 1 exposed under the smoke baffle 4 is h5, and the value range of h5 / h1 is 0.02-0.2. If h5 accounts for too large a proportion, the negative pressure area will be too high, affecting the oil fume absorption effect, and if h5 accounts for too small a proportion, the smoke baffle 4 will be too long and block the line of sight.

[0085] See also Figure 3 , Figure 6 , Fig. 9 and Fig.11The range hood further comprises a fresh air system 7, which is arranged in the fan frame 2. The fan frame 2 is provided with an air outlet 21 for the fresh air system 7 to blow out fresh air. In the present embodiment, the air outlet 21 is arranged at the bottom of the fan frame 2. Alternatively, the air outlet 21 may also be arranged on the front or left and right sides of the fan frame 2. When the smoke damper 4 is in the second state with the smoke damper 4 opened, in the horizontal plane projection, the air outlet 21 is completely within the range defined by the smoke damper 4, so that the air outlet 21 is completely blocked by the smoke damper 4, and the fresh air blown out from the air outlet 21 can be prevented from being sucked into the smoke inlet. The air outlet 21 is completely within the range defined by the smoke damper 4 means that the air outlet 21 of the fresh air system 7 is located above the smoke damper 4, and in the second state with the smoke damper 4 opened, the air outlet 21 is vertically downward (appended to the smoke inlet). Fig.11 The projection of the light beam (in the direction indicated by the arrow Z) will fall on the outer surface and / or edge of the smoke baffle. Fig.11 In the direction indicated by the middle arrow Y, i.e., the left-right direction (front-back direction for the user), the distance from the outermost side of the air outlet 21 (the side closest to the user) to the outermost side of the smoke shield 4 is d6, and the distance from the outermost side to the innermost side of the smoke shield 4 is d7, and d6 / d7≥1 / 8 is satisfied. Therefore, under the premise of ensuring that the fresh air is not sucked into the smoke inlet, the closer the fresh air outlet 21 is to the outside, the better, so that the path for the fresh air to be blown out can be as short as possible. The fresh air system 7 itself is a prior art and will not be described in detail here.

[0086] Embodiment 2

[0087] See also Figure 12 to Figure 16 In this embodiment, the difference from the above-mentioned embodiment 1 is that the range hood further includes a deflector 8 arranged on the side of the smoke baffle 4 facing the smoke inlet. The deflector 8 can play the same role as the above-mentioned housing 5, that is, it is convenient to set the electronic control device (control panel, lighting device, etc.), and can also play the role of deflection. The deflector 8 includes a first plate 81, a second plate 82 and a third plate 83. The first plate 81 is arranged on the side of the smoke baffle 4 facing the smoke inlet. The first plate 81 is a flat plate, which can be closely arranged on the smoke baffle 4 by bonding and fixed to the smoke baffle 4. Each plate has a first end and a second end opposite to each other. When the smoke baffle 4 is opened, the first plate 81 and the second plate 82 both extend in the front-to-back direction, and the first plate 81 extends in the same direction as the smoke baffle 4. At this time, the front ends of the first plate 81 and the second plate 82 are their respective first ends, the rear ends of the first plate 81 and the second plate 82 are their respective second ends, the upper end of the third plate 83 is its first end, and the lower end of the third plate 83 is its second end. The second plate 82 extends backward from the lower end of the smoke shield 4 or a position close to the lower end. Preferably, the second plate 82 gradually tilts upward from front to rear, and the third plate 83 is arranged in the up-down direction. Preferably, the third plate 83 gradually tilts backward from top to bottom.

[0088] The first end of the first plate 81 and the first end of the second plate 82 are arranged correspondingly, the third plate 83 is arranged between the first plate 81 and the second plate 82, the upper end of the third plate 83 is arranged correspondingly to the second end of the first plate 81, and the lower end of the third plate 83 is arranged correspondingly to the second end of the second plate 82. Thus, the three plates form a shape with a roughly triangular longitudinal cross section. In this embodiment, the second plate 82 and the third plate 83 are integrally formed, and the air deflector 8 includes a cover body composed of the second plate 82 and the third plate 83, and the cover body is detachably connected to the first plate 81.

[0089] A flange 811 extending away from the smoke baffle 4 is formed at the second end of the first plate 81. When the smoke baffle 4 is in the open state, the flange 811 extends downward. The first end of the first plate 81 and the first end of the second plate 82 are snap-fitted, and the first end of the third plate 83 abuts against the front side of the flange 811 to form an interference fit. A buckle 821 extending from the second end is provided at the first end of the second plate 82. A pressure bridge 812 is provided on the side of the first end of the first plate 81 away from the smoke baffle 4, and the buckle 821 is snap-fitted with the pressure bridge 812. The pressure bridge 812 is in the shape of a bridge, arched in the direction away from the smoke baffle 4, and the buckle 821 passes through the pressure bridge 812 from front to back and snaps with the pressure bridge 812. To prevent the buckle 821 from detaching from the pressure bridge 812, a protrusion 822 that protrudes in the direction away from the first plate body 81 is formed at the end of the buckle 821 away from the first end of the second plate body 82. The protrusion 822 can be V-shaped. When the buckle 821 and the pressure bridge 812 are engaged, the buckle 821 passes through the pressure bridge 812 from the side of the pressure bridge 812 close to the first end of the first plate body 81, and the protrusion 822 of the buckle 821 passes through the pressure bridge 812 and abuts against the side of the pressure bridge 812 away from the first end of the first plate body 81.

[0090] By installing the first plate 81 on the side of the smoke baffle 4 facing the smoke inlet, the cover body composed of the second plate 82 and the third plate 83 can be quickly installed and removed through a simple buckle design. During installation, the buckle 821 and the pressure bridge 812 are provided with a guide when they are pushed in the forward direction for easy installation. After being pushed in place, the buckle 821 pops up and will abut against the pressure bridge 812 to form a self-locking. When disassembly is required, press one end of the buckle 821 towards the smoke baffle 4 to make the buckle 821 withdraw from the pressure bridge 812 to achieve disassembly.

[0091] Embodiment 3

[0092] See also Figure 17-18In this embodiment, the difference from the above-mentioned embodiment 2 is that the air deflector 8 also includes a support plate 84 that supports the inner side of the air deflector 8, and the support plate 84 is arranged between the first plate 81, the second plate 82 and the third plate 83.

[0093] The support plate body 84 includes a first support plate body side 841, a second support plate body side 842, and a third support plate body side 843. The first support plate body side 841 abuts against the first plate body 81, the second support plate body side 842 abuts against the second plate body 82, and the third support plate body side 843 abuts against the third plate body 83. The support plate body 84 can abut against the middle position (middle position in the left-right direction) of the first plate body 81, the second plate body 82, and the third plate body 83, respectively.

[0094] The first side 841 of the support plate body is fixedly connected to the first plate body 81, the second side 842 of the support plate body is detachably connected to the second plate body 82, and the third side 843 of the support plate body is detachably connected to the third plate body 83. The first side 841 of the support plate body can be pre-connected with the first plate body 81 as a whole by riveting or bonding. After the second plate body 82 is snap-connected to the first plate body 81, the second plate body 82 is connected to the second side 842 of the support plate body by screws 85. After the third plate body 83 is in contact with the flange 811, the third plate body 83 is connected to the third side 843 of the support plate body by screws 85.

[0095] This embodiment can not only realize the convenience of disassembly and assembly of the cover body, but also enhance the structural strength and stability of the air deflector 8.

[0096] The "fluid communication" referred to in the present invention refers to the spatial position relationship between two parts or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path or / and be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, duct, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

Claims

1. A range hood, comprising: A fan frame (2) having a fan (3) disposed therein; A smoke collecting hood (1) connected to the fan frame (2), the smoke collecting hood (1) having a front side (11), a back side (12) and a smoke inlet; a smoke baffle (4) disposed on the smoke collecting hood (1) and having a first state and a second state, wherein in the first state, the smoke baffle (4) covers the front surface (11) of the smoke collecting hood (1), and in the second state, the smoke baffle (4) and the front surface (11) of the smoke collecting hood (1) form a smoke collecting cavity (Q), and the smoke inlet is located in the smoke collecting cavity (Q); and A fresh air system (7), located in the fan frame (2); An angle β is formed between the front side (11) of the smoke hood (1) and the back side (12) of the smoke hood (1), and β≤30°; the height of the front side (11) of the smoke hood (1) is h1, and h1≥450mm; the front side (11) of the smoke hood (1) forms a guide surface (111) in the area below the smoke inlet; the height of the guide surface (111) is h2, and h2≥220mm; when the smoke baffle (4) is in the second state, the angle between the smoke baffle (4) and the back side (12) of the smoke hood (1) is α, and α>β is satisfied; The smoke inlet comprises a first smoke inlet (131) and a second smoke inlet (132), the upper edge of the first smoke inlet (131) having a first high point (A); the upper edge of the second smoke inlet (132) having a second high point (A'), on a projection of a first vertical plane (S1) parallel to the back side (12) of the smoke collecting hood (1), a line connecting the first high point (A) and the central axis (X) of the impeller of the fan (3) is a first connecting line (L1), and a line connecting the second high point (A') and the central axis (X) of the impeller of the fan (3) is a first connecting line (L1). The line connecting the central axis (X) of the impeller is the second line (L2), the angle between the first line (L1) and the second line (L2) is θ1, the central axis (X) of the impeller is located in a second vertical plane (S2) perpendicular to the horizontal plane, the angle between the first line (L1) and the second vertical plane (S2) is θ2, the angle between the second line (L2) and the second vertical plane (S2) is θ3, and θ1≤30°, or θ2≤15° and / or θ3≤20° are satisfied; The first smoke inlet (131) has a first annular wall (141) on its periphery, the second smoke inlet (132) has a second annular wall (142) on its periphery, the first annular wall (141) encloses a first smoke inlet cavity (151), the second annular wall (142) encloses a second smoke inlet cavity (152), and the entrance area of ​​each smoke inlet cavity is greater than the area of ​​the corresponding smoke inlet; Features: A shell (5) is arranged on the smoke baffle (4), and the shell (5) constitutes a part of the side wall defining the smoke collecting chamber (Q); in the second state, the highest point (C) of the side surface of the shell (5) close to the smoke inlet is lower than the highest point (B) of the smoke baffle (4), and the highest point (C) of the side surface of the shell (5) close to the smoke inlet corresponds to the front side (11) of the smoke collecting hood (1), and the corresponding position is higher than the position of the smoke inlet; In the first state, at least 90% of the shell (5) in the thickness direction is located outside the smoke collecting hood (1); the area of ​​the smoke inlet is smaller than the area of ​​the shell (5) close to the smoke inlet, and the back side of the shell (5) close to the smoke inlet completely covers the smoke inlet; An air outlet (21) for the fresh air system (7) is arranged on the fan frame (2); in the second state, in horizontal plane projection, the air outlet (21) is completely within the range defined by the smoke baffle (4).

2. The range hood according to claim 1, characterized in that: The air outlet (21) of the fresh air system (7) is arranged at the bottom of the fan frame (2).

3. The range hood according to claim 1, characterized in that: In the second state, in the depth direction, the distance from the outermost side of the air outlet (21) to the outermost side of the smoke baffle (4) is d6, and the distance from the outermost side to the innermost side of the smoke baffle (4) is d7, and d6 / d7≥1 / 8 is satisfied.

4. The range hood according to claim 1, characterized in that: The range hood further comprises an oil cup (6), wherein the oil cup (6) is arranged below the smoke inlet, and a cover plate (112) is arranged on the front side (11) of the smoke collecting hood (1) at the oil cup (6), wherein the cover plate (112) constitutes a part of the guide surface (111).

5. The range hood according to claim 4, characterized in that: The cover plate (112) completely covers the oil cup (6); the height of the cover plate (112) is h3, and the value range of h3 / h1 is 0.1 to 0.

3.

6. The range hood according to claim 4 or 5, characterized in that: In the first state, the smoke baffle (4) covers the cover plate (112) and exposes the lower surface of the front side (11) of the smoke hood (1), the height of the lower surface is h5, and the value range of h5 / h1 is 0.02 to 0.

2.

7. The range hood according to claim 1, characterized in that: A first smoke collecting chamber (Q1) is formed between the portion of the smoke baffle (4) located below the shell (5) and the front face (11) of the smoke collecting hood (1), and a second smoke collecting chamber (Q2) is formed between the side of the shell (5) close to the front face (11) of the smoke collecting hood (1) and the front face (11) of the smoke collecting hood (1). The depth of the first smoke collecting chamber (Q1) at any position is d1, and the depth of the second smoke collecting chamber (Q2) at any position is d2, and the value range of d1 / d2 is 1.05 to 1.

3.

8. The range hood according to claim 1, characterized in that: In the second state, the horizontal distance between the highest point (C) of the shell (5) close to the smoke inlet and the front side (11) of the smoke collecting hood (1) is less than 20 mm, 15 mm or 10 mm.

9. The range hood according to claim 1, characterized in that: In the vertical direction, the distance between the highest point (C) of the side surface of the shell (5) close to the smoke inlet and the first highest point (A) of the first smoke inlet (131) is D, the height of the first smoke inlet (131) is h4, and the value range of D / h4 is 0.2 to 0.7; and / or the distance between the highest point (C) of the side surface of the shell (5) close to the smoke inlet and the second highest point (A') of the second smoke inlet (132) is D, the height of the second smoke inlet (132) is h4, and the value range of D / h4 is 0.2 to 0.

7.

10. The range hood according to claim 1, characterized in that: The vertical distance between the lowest point of the lower edge of the first smoke inlet (131) and the second smoke inlet (132) and the lower end of the smoke collecting hood (1) is d3, and d3≥1 / 2*h1 is satisfied.

11. The range hood according to claim 1, characterized in that: The fan (3) has an air inlet (31), and the space between the air inlet (31) and the corresponding side wall of the fan frame (2) constitutes an air inlet channel (32). In horizontal plane projection, at least 50% of the depth of the smoke inlet falls into the air inlet channel (32).

12. The range hood according to claim 1, characterized in that: The fan (3) has an air inlet (31), and the space between the air inlet (31) and the corresponding side wall of the fan frame (2) constitutes an air inlet channel (32). In horizontal plane projection, the smoke inlet is completely within the air inlet channel (32) in terms of depth.

13. A range hood, comprising: A fan frame (2) having a fan (3) disposed therein; A smoke collecting hood (1) connected to the fan frame (2), the smoke collecting hood (1) having a front side (11), a back side (12) and a smoke inlet; a smoke baffle (4) disposed on the smoke collecting hood (1) and having a first state and a second state, wherein in the first state, the smoke baffle (4) covers the front surface (11) of the smoke collecting hood (1), and in the second state, the smoke baffle (4) and the front surface (11) of the smoke collecting hood (1) form a smoke collecting cavity (Q), and the smoke inlet is located in the smoke collecting cavity (Q); and The fresh air system (7) is located in the fan frame (2); and is characterized by: The fan frame (2) is provided with an air outlet (21) of the fresh air system (7); in the second state, in horizontal plane projection, the air outlet (21) is completely within the range defined by the smoke baffle (4).

14. The range hood according to claim 13, characterized in that: The air outlet (21) of the fresh air system (7) is arranged at the bottom of the fan frame (2).

15. The range hood according to claim 13, characterized in that: In the second state, in the depth direction, the distance from the outermost side of the air outlet (21) to the outermost side of the smoke baffle (4) is d6, and the distance from the outermost side to the innermost side of the smoke baffle (4) is d7, and d6 / d7≥1 / 8 is satisfied.

16. The range hood according to claim 13, characterized in that: The front side (11) of the smoke hood (1) forms a guide surface (111) in the area below the smoke inlet, the height of the front side (11) of the smoke hood (1) is h1, and satisfies h1≥450mm, and the height of the guide surface (111) is h2, and satisfies h2≥220mm.

17. The range hood according to claim 16, characterized in that: In the first state, the height of the lower surface of the front side (11) of the smoke collecting hood (1) exposed below the smoke baffle (4) is h5, and the value range of h5 / h1 is 0.02 to 0.

2.

18. The range hood according to claim 13, characterized in that: The smoke baffle (4) is provided with a shell (5), the shell (5) constituting a part of the side wall defining the smoke collecting cavity (Q), and in the second state, the highest point (C) of the side surface of the shell (5) close to the smoke inlet is lower than the highest point (B) of the smoke baffle (4); A first smoke collecting chamber (Q1) is formed between the portion of the smoke baffle (4) located below the shell (5) and the front face (11) of the smoke collecting hood (1), and a second smoke collecting chamber (Q2) is formed between the side of the shell (5) close to the front face (11) of the smoke collecting hood (1) and the front face (11) of the smoke collecting hood (1). The depth of the first smoke collecting chamber (Q1) at any position is d1, and the depth of the second smoke collecting chamber (Q2) at any position is d2, and the value range of d1 / d2 is 1.05 to 1.

3.

19. The range hood according to claim 18, characterized in that: In the vertical direction, the distance between the highest point (C) of the side surface of the shell (5) close to the smoke inlet and the highest point of the upper edge of the smoke inlet is D, the height of the smoke inlet is h4, and the value range of D / h4 is 0.2 to 0.

7.

20. The range hood according to claim 13, characterized in that: The vertical distance between the lowest point of the lower edge of the smoke inlet and the lower end of the smoke hood (1) is d3, the height of the front face (11) of the smoke hood (1) is h1, and d3≥1 / 2*h1 is satisfied.

21. The range hood according to claim 13, characterized in that: The fan (3) has an air inlet (31), and the space between the air inlet (31) and the corresponding side wall of the fan frame (2) constitutes an air inlet channel (32). In horizontal plane projection, at least 50% of the depth of the smoke inlet falls into the air inlet channel (32).

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