Range hood

Abstract

The utility model relates to a range hood which comprises an exhaust fume collecting hood, an exhaust fume collecting cavity formed by upward sinking is formed in the bottom of the exhaust fume collecting hood, and an air inlet for external flue gas to enter the exhaust fume collecting hood is formed in the inner wall of the exhaust fume collecting cavity; the smoke baffle is arranged on the opening edge of the smoke collecting cavity of the smoke collecting hood and inclines towards the position where the peripheral edge of the smoke collecting hood is located from top to bottom; the extending direction of the part, close to the edge of the opening of the smoke collecting cavity, of the smoke baffle intersects with the area where the air inlet in the smoke collecting cavity is located. Due to the structural design that the extending direction of the part, close to the edge of the opening of the smoke collecting cavity, of the smoke baffle intersects with the area where the air inlet in the smoke collecting cavity is located, smoke flowing along the smoke guide plate can enter the air inlet of the smoke collecting cavity more smoothly and quickly; the problem of turbulent flow or collapse caused by secondary impact of the smoke gas into the smoke collecting cavity in the process of entering the smoke collecting cavity is avoided, and the oil smoke suction and exhaust efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a range hood. Background Art

[0002] The central area of ​​the bottom of the smoke hood of a traditional range hood is concave to form a smoke collecting chamber for collecting smoke. An air inlet is provided on the top wall of the smoke collecting chamber, and an oil net for filtering oil smoke is provided at the air inlet. There is also a rectifier plate for rectifying the oil smoke below the air inlet to improve the oil smoke absorption effect. For example, the Chinese utility model patent application with application number CN201320774041.7 (authorization announcement number: CN203628763U) discloses this top suction range hood. However, since the air inlet is located in the middle area of ​​the smoke hood, and the two burners on the stove are located on the left and right sides, that is, they are not opposite to the air inlet in the up and down direction, therefore, when a large amount of oil smoke rises, there is still a situation where it escapes from the left and right sides of the smoke hood.

[0003] For this reason, a dual-chamber range hood has emerged, that is, a top-suction range hood with two left and right smoke collecting chambers at the bottom of the smoke hood. For example, the Chinese utility model patent application with application number CN2021222635265.7 discloses a range hood, including a fan frame and a smoke collecting hood, the bottom of the smoke collecting hood has two smoke collecting chambers arranged in sequence on the left and right, and an air inlet is opened on the wall of each smoke collecting chamber. Two smoke baffles are also provided at the bottom of the smoke collecting hood, and the two smoke baffles correspond to the two air inlets one by one. When the range hood is running, the smoke baffle can open the air inlet correspondingly, and in the open state, the side edge of the smoke baffle is correspondingly located outside the vertical projection of the smoke collecting hood, thereby moving the smoke collecting area downward, and correspondingly increasing the lateral size of the smoke collecting area to reduce the escape of oil smoke. However, since the smoke baffle of the range hood is in a fixed tilt angle when opened, usually, the tilt angle setting of the smoke baffle fails to take into account the effective matching problem with the position of the air inlet opened on the inner wall of the smoke collecting chamber. Most of the oil smoke will first collide with the inner wall of the smoke collecting chamber and dissipate before entering the air inlet when entering the smoke collecting chamber along the smoke baffle. That is, the oil smoke cannot be quickly sucked out from the air inlet, and the oil smoke suction and exhaust effect is not high. Therefore, the risk of oil smoke escape is increased to a certain extent.

[0004] For another example, the Chinese utility model patent application with application number CN202121464048.X also discloses a double-chamber double-net range hood, including a smoke hood and a box body panel, the bottom of the smoke hood has two smoke chambers arranged in sequence on the left and right, each smoke chamber is provided with an air inlet, and an inner oil guide assembly and an outer oil guide assembly (that is, an oil net) are provided at the air inlet, the upper end of the inner oil guide assembly is connected to the lower end of the side of the box body panel, and the lower end thereof is connected to the middle of the smoke hood; the upper end of the outer oil guide assembly is abutted against the lower end of the side of the box body panel, and the lower end thereof is connected to the smoke hood; wherein the inner oil guide assembly is inclined toward the middle of the smoke hood, and the outer oil guide assembly is an inverted cone, and the oil for the smoke hood flows along the inclined direction of the inner oil guide assembly and the outer oil guide assembly. However, the mesh holes on the mesh plate at the air inlet of the smoke hood of the double-chamber range hood are generally evenly arranged, that is, the ventilation area of ​​the mesh plate is basically the same in the front and rear directions. It does not take into account that the rear side of the range hood body is basically installed against the wall. When a large amount of smoke rises, it will accumulate on the bottom front side of the body. If the accumulated smoke cannot be sucked and discharged in time, it is easy to escape at the front side of the smoke hood. Therefore, the existing range hood fails to perform a good flow distribution in the front and rear directions, which also affects the oil fume extraction effect to a certain extent. On the other hand, the inner oil guide assembly and the outer oil guide assembly set in the above-mentioned double-chamber range hood are only used to guide the oil dirt accumulated on the enclosure of the box body, but do not take into account the dripping problem of the oil dirt accumulated on the bottom wall of the fan system (mainly the volute) inside the box body. Since the two air inlets of the smoke hood are relatively close, the oil accumulated on the volute of the fan system will pass through the air inlet (or the mesh holes of the mesh plate at the air inlet) and drip onto the stove, affecting the user experience. In addition, the noise generated by the fan system will also be transmitted through the ventilation holes on the oil screen to the cooking area where the stove is located, affecting the user experience.

[0005] Therefore, existing range hoods need further improvement. Utility Model Content

[0006] The first technical problem to be solved by the utility model is to provide a range hood with a more reasonable smoke baffle angle design and the ability to effectively improve the oil smoke suction and exhaust efficiency in view of the current status of the prior art.

[0007] The second technical problem to be solved by the utility model is to provide a range hood that can better distribute the flow of oil smoke in the front and rear directions, increase the smoke collection effect, ensure the effective air intake, and reduce smoke overflow in response to the current status of the existing technology.

[0008] The third technical problem to be solved by the utility model is to provide a range hood that can prevent the oil accumulated on the fan system from dripping onto the stove through the air inlet and reduce the noise transmission in response to the current status of the existing technology.

[0009] The fourth technical problem to be solved by the present utility model is to provide a range hood which can distribute the oil smoke better, prevent the oil accumulated on the fan system from dripping onto the stove through the air inlet and reduce the noise transmission in response to the current status of the existing technology.

[0010] The technical solution adopted by the utility model to solve the above-mentioned first technical problem is: a range hood, comprising:

[0011] The smoke collecting hood has a smoke collecting cavity formed by an upward depression at the bottom, and an air inlet for external smoke to enter the smoke collecting hood is opened on the inner wall of the smoke collecting cavity;

[0012] A smoke baffle is arranged at the open edge of the smoke collecting cavity of the smoke collecting hood and is inclined from top to bottom toward the position of the outer peripheral edge of the smoke collecting hood;

[0013] The extension direction of the portion of the smoke baffle plate adjacent to the open edge of the smoke collecting chamber (ie, the smoke guiding direction) intersects with the area where the air inlet on the smoke collecting chamber is located.

[0014] The above-mentioned smoke baffle can be a "flat plate structure", of course, it can also be an "arc plate structure" that is bent in its entirety or in part.

[0015] Generally, the smoke baffle may be in a state of being inclined at a fixed angle relative to the smoke hood, but in order to reduce the sense of spatial oppression when the range hood is in the off state and to improve the overall aesthetics of the range hood, the smoke baffle is rotatably connected to the open edge of the smoke collecting chamber with a horizontally extending axis as the rotation center, and has at least a closed state in which it is folded relative to the bottom of the smoke hood to close the bottom opening of the smoke collecting chamber and an open state in which it is unfolded relative to the bottom of the smoke hood to open the bottom opening of the smoke collecting chamber. When the smoke baffle is in the open state, the smoke baffle is inclined from top to bottom toward the position of the outer peripheral edge of the smoke hood, and the extension direction of the portion of the smoke baffle adjacent to the open edge of the smoke collecting chamber intersects with the area where the air inlet on the smoke collecting chamber is located.

[0016] Generally speaking, the rotation axis of the smoke baffle plate of this embodiment relative to the smoke hood can extend along the left-right direction or the front-back direction, but considering the need to adapt to the spatial layout of the range hood installation environment and the fact that oil smoke escapes mainly on the left and right sides of the range hood, preferably, the rotation axis of the smoke baffle plate relative to the smoke hood basically extends along the front-back direction, and when the smoke baffle plate is in the open state, the smoke baffle plate is tilted to the left from top to bottom or to the right from top to bottom.

[0017] In order to smoothly guide the oil smoke flowing along the smoke baffle to the position of the air inlet of the smoke collecting chamber and further improve the oil smoke suction and exhaust effect, the inner wall of the smoke collecting chamber is divided into a first guide wall and a second guide wall by a vertical plane passing through the top position of the smoke collecting chamber and extending in the front-to-back direction. The first guide wall and the second guide wall are both inclined from top to bottom relative to the vertical plane extending front-to-back. The inclination direction of the first guide wall is the same as the inclination direction of the smoke baffle, and the inclination direction of the second guide wall is opposite to the inclination direction of the smoke baffle. The air inlet is opened on the second guide wall, and the smoke baffle is connected to the bottom open edge of the smoke collecting chamber at a position corresponding to the first guide wall.

[0018] In order to adapt to the double stoves arranged at intervals on the left and right and achieve the purpose of targeted suction and exhaust of oil smoke, the smoke hood has two smoke collecting chambers arranged at intervals on the left and right, respectively, the two smoke collecting chambers are a first smoke collecting chamber located on the left and a second smoke collecting chamber located on the right, a first air inlet is opened on the inner wall of the first smoke collecting chamber, a second air inlet is opened on the inner wall of the second smoke collecting chamber, and the smoke baffles are also provided with two, respectively, a first smoke baffle is provided at the open edge of the first smoke collecting chamber and a second smoke baffle is provided at the open edge of the second smoke collecting chamber, when the first smoke baffle is in the open state, the first smoke baffle is inclined to the left from top to bottom, and when the second smoke baffle is in the open state, the second smoke baffle is inclined to the right from top to bottom.

[0019] In order to smoothly guide the oil smoke to the corresponding smoke collector through the corresponding smoke baffle plate to achieve the purpose of smooth smoke exhaust, the first smoke collecting chamber has a first side wall and a second side wall opposite to each other in the left and right directions, the first side wall of the first smoke collecting chamber is inclined to the left from top to bottom, and the second side wall is inclined to the right from top to bottom, the first air inlet is opened on the second side wall of the first smoke collecting chamber, and the inclination direction of the first smoke baffle plate in the open state is the same as the inclination direction of the first side wall of the first smoke collecting chamber;

[0020] The second smoke collecting chamber has a third side wall and a fourth side wall opposite to each other in the left and right directions, the third side wall of the second smoke collecting chamber is inclined to the left from top to bottom, and the fourth side wall is inclined to the right from top to bottom, the second air inlet is opened on the third side wall of the second smoke collecting chamber, and the inclination direction of the second smoke baffle in the open state is the same as the inclination direction of the fourth side wall of the second smoke collecting chamber.

[0021] In order to further reduce the turbulence or collapse caused by the secondary impact of the smoke on the side wall of the smoke collecting chamber during the flow of smoke, the angle between the first smoke baffle in the open state and the horizontal plane is recorded as the first angle, and the angle between the first side wall of the first smoke collecting chamber and the horizontal plane is recorded as the second angle, and the first angle is smaller than the second angle;

[0022] The angle between the second smoke baffle in the open state and the horizontal plane is recorded as the third angle, the angle between the fourth side wall of the second smoke collecting chamber and the horizontal plane is recorded as the fourth angle, and the third angle is smaller than the fourth angle.

[0023] As an improvement, the first angle is recorded as α1, where 5°<α1<30°, and the second angle is recorded as α2, where 45°<α2<75°;

[0024] The third angle is recorded as β1, where 5°<β1<30°, and the fourth angle is recorded as β2, where 45°<β2<75°.

[0025] In order to effectively increase the lateral size of the smoke trapping area after the corresponding smoke baffle is opened and further ensure the smoke trapping effect, the orthographic projection of the second side edge of the first smoke baffle in the opened state on the horizontal plane is located outside the orthographic projection of the smoke collecting hood on the horizontal plane;

[0026] The orthographic projection of the fourth side of the second smoke baffle in the open state on the horizontal plane is located outside the orthographic projection of the smoke collecting hood on the horizontal plane.

[0027] While achieving the smoke trapping effect, in order to avoid the sense of spatial oppression caused by the corresponding smoke baffle in the open state and improve the user experience, the size of the part of the orthographic projection of the first smoke baffle in the open state on the horizontal plane that is outside the orthographic projection of the smoke hood on the horizontal plane in the left-right direction is recorded as L1, and the size of the smoke hood in the left-right direction is recorded as L, wherein 0<L1 / L<0.1;

[0028] The dimension in the left-right direction of the part of the orthographic projection of the second smoke baffle in the open state on the horizontal plane that is outside the orthographic projection of the smoke hood on the horizontal plane is recorded as L2, and the dimension of the smoke hood in the left-right direction is recorded as L, wherein 0<L2 / L<0.1.

[0029] In order to filter the oil smoke, an oil net for filtering the oil smoke is provided at the air inlet.

[0030] The technical solution adopted by the utility model to solve the second technical problem is: a range hood, comprising:

[0031] A smoke collecting hood, the bottom of which is provided with an air inlet for external smoke to enter the smoke collecting hood;

[0032] An oil net is arranged at the air inlet of the fume hood, and the oil net is provided with ventilation holes;

[0033] Among them, the first area is closer to the front side of the smoke hood relative to the second area, the size of the first area in the front-to-back direction is denoted as Y1, and the overall size of the oil net in the front-to-back direction is denoted as Y, wherein 10%≤Y1 / Y≤30%, the ratio of the total opening area of ​​the first area of ​​the oil net to the total area of ​​the first area is a1, and the ratio of the total opening area of ​​the second area of ​​the oil net to the total area of ​​the second area is a2, wherein a1>a2.

[0034] In order to further optimize the air flow distribution of the oil net, the ratio of the total opening area of ​​the first region of the oil net to the total area of ​​the first region is in the range of: 60% <a1<90%;

[0035] The ratio of the total opening area of ​​the second region of the oil net to the total area of ​​the second region is in the range of: 45% <a2<80%。

[0036] In order to further improve the situation where oil smoke escapes from the front side of the smoke hood, the oil net includes a ventilation area away from the bottom central area of ​​the smoke hood in the left and right directions and distributed with ventilation holes, and a closed area adjacent to the bottom central area of ​​the smoke hood in the left and right directions and is a closed plate body as a whole. The ventilation area and the closed area both extend in the front-to-back direction and are distributed together at the locations of the first area and the second area.

[0037] The size of the ventilation area on the first area in the left-right direction gradually increases from the back to the front, and the size of the closed area on the first area in the left-right direction gradually decreases from the back to the front.

[0038] There are generally two left and right burners on the stove. In order to adapt to the two left and right burners, the bottom of the smoke hood has a first air inlet and a second air inlet arranged in sequence along the left and right directions. There are two oil nets, namely a first oil net arranged at the first air inlet and a second oil net arranged at the second air inlet.

[0039] In order to further reduce the problem of oil smoke escaping, the bottom of the smoke collecting hood has a first smoke collecting chamber and a second smoke collecting chamber which are sequentially arranged in the left and right directions and are both concave upwards, the first air inlet is arranged on the top wall of the first smoke collecting chamber, and the second air inlet is arranged on the top wall of the second smoke collecting chamber. The concave smoke collecting chamber plays the role of buffering oil smoke, and it is not easy to escape when a large amount of oil smoke rises.

[0040] Generally, in order to collect the oil accumulated on the oil net, the oil cup can be arranged on the rear side of the bottom of the smoke hood, such as a strip-shaped cup body extending in the left-right direction. Correspondingly, the oil net as a whole can be tilted downward from front to back. However, in order to enable the oil on the oil net to flow quickly into the oil cup, it also includes an oil cup arranged at the bottom of the smoke hood and located between the first smoke collecting chamber and the second smoke collecting chamber. The oil cup is strip-shaped as a whole and extends in the front-to-back direction. The first oil net is located on the left side of the bottom of the smoke hood, and at least the second area of ​​the first oil net is tilted downward from left to right. The right side edge of the first oil net is located above the oil cup, and its orthographic projection on the horizontal plane falls into the oil cup. The second oil net is located on the right side of the bottom of the smoke hood, and at least the second area of ​​the second oil net is tilted downward from right to left. The left side edge of the second oil net is located above the oil cup, and its orthographic projection on the horizontal plane falls into the oil cup.

[0041] Generally, the oil net can be set to a partially curved or bent net structure according to actual needs, but in order to simplify the oil net structure and facilitate oil diversion, the first oil net is flat as a whole and tilts downward from left to right, and the second oil net is also flat as a whole and tilts downward from right to left.

[0042] In order to facilitate the processing and forming of the oil net, the oil net also has a closed area that cannot allow smoke to pass through, and the closed area is a plate structure integrally formed on the oil net. It is conceivable that in addition to the integral design, the oil net can also be implemented by using an additional baffle component to cover the conventional oil net. The closed area on the oil net can be set on the first area of ​​the oil net, or on the second area of ​​the oil net, or on both the first area and the second area of ​​the oil net.

[0043] As an improvement, each of the ventilation holes of the oil net is a strip hole extending in the left-right direction, and the outer edge of each ventilation hole is bent inward to form a retaining edge for blocking oil. The arrangement of the strip holes extending left and right and the retaining edge can effectively prevent the oil attached to the inner side of the oil net from dripping down from the ventilation holes and facilitate the smooth diversion of the oil into the oil cup.

[0044] The technical solution adopted by the utility model to solve the third technical problem is: a range hood, comprising:

[0045] A smoke collecting hood, the bottom of which is provided with an air inlet for external smoke to enter the smoke collecting hood;

[0046] An oil net assembly is arranged at the air inlet of the fume hood, and ventilation holes are distributed on the oil net assembly;

[0047] The oil net assembly includes a ventilation area with ventilation holes distributed thereon and a closed area through which smoke cannot pass. The left and right dimensions of the closed area's orthographic projection on the horizontal plane are denoted as D1, and the left and right dimensions of the orthographic projection of the entire oil net on the horizontal plane are denoted as D, wherein 1 / 4<D1 / D, the front and back dimensions of the orthographic projection of the closed area on the oil net on the horizontal plane are denoted as C1, and the front and back dimensions of the orthographic projection of the entire oil net on the horizontal plane are denoted as C, wherein 1 / 20<C1 / C.

[0048] When the oil net assembly is an integrated oil net structure, the closed area of ​​the above-mentioned oil net assembly can be understood as being composed of a closed plate body formed on the oil net. When the oil net assembly includes an oil net (which can be multiple oil nets) and components such as an oil cup, the closed area of ​​the above-mentioned oil net assembly can be understood as being composed of a closed plate body formed on the oil net and components such as an oil cup (blocking the air inlet). For example: the bottom of the smoke hood has a first air inlet and a second air inlet arranged in sequence along the left and right directions, the oil net assembly includes a first oil net arranged at the first air inlet, a second oil net arranged at the second air inlet, and an oil cup located between the first oil net and the second oil net, the first oil net and the second oil net are both provided with the ventilation area and the closed plate that cannot allow smoke to pass through, the ventilation area of ​​the first oil net and the ventilation area of ​​the second oil net are far away from each other, and together constitute the ventilation area of ​​the oil net assembly, the closed plate of the first oil net and the closed plate of the second oil net are close to each other, and together with the oil cup constitute the closed area of ​​the oil net assembly.

[0049] No ventilation holes are set in the closed area, and its area needs to be reasonably designed. If it is set too small, it cannot effectively block dripping oil and achieve the purpose of sound insulation. If it is set too large, it will seriously affect the air intake volume of the oil net. Therefore, preferably, the area of ​​the closed area on the oil net assembly is denoted as S1, and the total area of ​​the oil net assembly is denoted as S, where the value range is: 1 / 80<S1 / S.

[0050] Taking into account the arc structure on the annular wall of the volute, the oil on the annular wall will easily drip downward when flowing downward to the bottom area of ​​the volute. In order to prevent the oil from dripping onto the stove through the ventilation holes of the oil net assembly, the range hood also includes a volute, and the orthographic projection of the volute on the horizontal plane at least partially overlaps with the orthographic projection of the closed area of ​​the oil net assembly on the horizontal plane. The size of the overlapping area in the left and right directions is denoted as M1, and the left and right sizes of the orthographic projection of the entire volute on the horizontal plane are denoted as M, wherein M1 / M≥50%.

[0051] Taking into account that oil smoke mainly escapes at the front side of the smoke hood, the structure of the closed area on the oil net needs to be adaptively designed to improve the situation of oil smoke escaping at the front side of the smoke hood. The closed area on the oil net extends in the front-to-back direction, and the width of at least the front area of ​​the closed area gradually decreases from the back to the front. Correspondingly, the ventilation area on the oil net also extends in the front-to-back direction, and the width of at least the front area of ​​the closed area gradually increases from the back to the front.

[0052] In order to adapt to the two burners arranged on the left and right of the stove, the bottom of the smoke hood has a first air inlet and a second air inlet arranged in sequence along the left and right directions, and the oil net has two, namely a first oil net arranged at the first air inlet and a second oil net arranged at the second air inlet, and the first oil net and the second oil net are both provided with the ventilation area and the closed area.

[0053] As an improvement, the bottom of the smoke collecting hood has a first smoke collecting chamber and a second smoke collecting chamber which are sequentially arranged in the left and right directions and are both concave upwards, the first air inlet is arranged on the top wall of the first smoke collecting chamber, and the second air inlet is arranged on the top wall of the second smoke collecting chamber. The concave smoke collecting chamber plays a role in buffering the oil smoke, and it is not easy for the oil smoke to escape when it rises in large quantities.

[0054] In order to enable the oil on the oil net to flow quickly into the oil cup, it also includes an oil cup arranged at the bottom of the smoke collecting hood and between the first smoke collecting chamber and the second smoke collecting chamber. The oil cup is strip-shaped as a whole and extends in the front-to-back direction. The first oil net is located on the left side of the bottom of the smoke collecting hood, and at least the closed area of ​​the first oil net is inclined downward from left to right, and the right side edge of the first oil net is located above the oil cup, and its orthographic projection on the horizontal plane falls into the oil cup. The second oil net is located on the right side of the bottom of the smoke collecting hood, and the closed area of ​​the second oil net is inclined downward from right to left, and the left side edge of the second oil net is located above the oil cup, and its orthographic projection on the horizontal plane falls into the oil cup.

[0055] In order to facilitate the processing and forming of the oil net, the closed area on the oil net is a plate structure integrally formed on the oil net. It is conceivable that in addition to the integral design, the oil net can also be implemented by using an additional baffle component to cover the conventional oil net.

[0056] As an improvement, each of the ventilation holes of the oil net is a strip hole extending in the left-right direction, and the outer edge of each ventilation hole is bent inward to form a retaining edge for blocking oil. The arrangement of the strip holes extending left and right and the retaining edge can effectively prevent the oil attached to the inner side of the oil net from dripping down from the ventilation holes and facilitate the smooth diversion of the oil into the oil cup.

[0057] The technical solution adopted by the utility model to solve the fourth technical problem is: a range hood, comprising:

[0058] A smoke collecting hood, the bottom of which is provided with an air inlet for external smoke to enter the smoke collecting hood;

[0059] An oil net is arranged at the air inlet of the fume hood, and the oil net is provided with ventilation holes;

[0060] The oil net includes a first area and a second area which are arranged in sequence from front to back and both are provided with ventilation holes. The ratio of the total area of ​​the first area of ​​the oil net to the overall area of ​​the oil net is denoted as m, wherein the value range of m is: 1 / 5<m<2 / 5;

[0061] The ratio of the total opening area of ​​the first region of the oil net to the total area of ​​the first region is a1, and the ratio of the total opening area of ​​the second region of the oil net to the total area of ​​the second region is a2, wherein a1>a2;

[0062] The oil net also includes a ventilation area with ventilation holes distributed thereon and a closed area which is a closed plate as a whole. The left and right dimensions of the orthographic projection of the closed area on the horizontal plane are denoted as D1, and the left and right dimensions of the orthographic projection of the oil net as a whole on the horizontal plane are denoted as D; the front and back dimensions of the orthographic projection of the closed area on the oil net on the horizontal plane are denoted as C1, and the front and back dimensions of the orthographic projection of the oil net as a whole on the horizontal plane are denoted as C. The area of ​​the closed area on the oil net is denoted as S1, and the total area of ​​the oil net is denoted as S, wherein 1 / 4<D1 / D, 1 / 20<C1 / C, and 1 / 80<S1 / S.

[0063] Compared with the prior art, the utility model has the following advantages:

[0064] 1. The inclination angle of the smoke baffle is set to be inclined from top to bottom toward the position of the peripheral edge of the smoke collecting hood. In particular, the extension direction of the portion of the smoke baffle adjacent to the open edge of the smoke collecting chamber intersects with the area where the air inlet on the smoke collecting chamber is located, so that the smoke flowing along the smoke guide plate can enter the air inlet of the smoke collecting chamber more smoothly and quickly, avoiding the smoke from hitting the side wall of the smoke collecting chamber for the second time during the process of entering the smoke collecting chamber to cause turbulence or collapse, thereby effectively improving the efficiency of oil smoke suction and exhaust.

[0065] 2. Since the proportion of the area of the ventilation holes in the first area on the front side of the oil mesh of the range hood is greater than that in the second area on the rear side of the oil mesh, when the cooking fumes flow to the front side of the bottom of the smoke collecting hood, they can be timely sucked and discharged into the interior of the smoke collecting hood, avoiding the situation of escaping in front of the smoke collecting hood due to the failure to be timely sucked and discharged during the large-scale rising of the cooking fumes, realizing a better flow distribution of the cooking fumes in the front-rear direction, and improving the user experience. In addition, in order to ensure that the oil mesh can achieve the ideal purpose of flow distribution in the front-rear direction, the area of the first area with a larger opening ratio on the front side of the oil mesh also needs to be reasonably designed. For example, if the ratio m of the area of the first area of the oil mesh to the overall area of the oil mesh is too small, when the cooking fumes are large, there will also be a situation of escaping in front of the smoke collecting hood due to the failure to be timely sucked and discharged. If the ratio m of the area of the first area of the oil mesh to the overall area of the oil mesh is too large, it is easy to cause an increase in ineffective air intake on the front side of the oil mesh, which is not conducive to the rapid suction and discharge of the cooking fumes.

[0066] 3. The setting of the closed area on the oil mesh assembly of the range hood can correspondingly receive the oil droplets dripping from above the smoke collecting hood, preventing the oil droplets from passing through the ventilation holes of the corresponding oil mesh assembly and dripping onto the stove top. At the same time, the closed area of the oil mesh can also isolate the noise generated during the operation of the fan system to a certain extent, reducing the transmission of noise through the air inlet and improving the sound quality of the range hood. In addition, the ratio D1 / D (the dimension in the left-right direction of the vertical projection) of the closed area to the entire oil mesh assembly and the ratio S1 / S of the closed area to the entire oil mesh assembly are limited within a reasonable range: 1 / 4 < D1 / D, 1 / 80 < S1 / S. On the basis of effectively isolating the noise and blocking the oil droplets, it can avoid having an adverse impact on the ventilation air volume of the oil mesh due to an overly large closed area. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 is a perspective structural view of the range hood according to an embodiment of the present invention;

[0068] Figure 2 is a vertical cross-sectional view of the range hood according to an embodiment of the present invention cut along the left-right direction (both the first smoke baffle and the second smoke baffle are in the open state);

[0069] Figure 3 is a vertical cross-sectional view of the range hood according to an embodiment of the present invention cut along the left-right direction (both the first smoke baffle and the second smoke baffle are in the closed state);

[0070] Figure 4 is a vertical cross-sectional view of the range hood according to an embodiment of the present invention cut along the front-rear direction;

[0071] Figure 5 is a perspective structural view of the front side of the first oil mesh according to an embodiment of the present invention;

[0072] Figure 6 This is a schematic diagram of the three-dimensional structure of the back side of the first oil screen of an embodiment of the utility model;

[0073] Figure 7 This is a front view of the first oil screen of the embodiment of the utility model;

[0074] Figure 8 This is a front view of the second oil screen of the embodiment of the utility model;

[0075] Fig. 9 It is a schematic diagram of the three-dimensional structure of the back side of the second oil screen of an embodiment of the utility model;

[0076] Fig.10 A bottom view of the range hood according to an embodiment of the utility model;

[0077] Fig.11 A vertical cross-sectional view of the range hood according to an embodiment of the utility model cut along the left-right direction;

[0078] Fig.12 This is a schematic diagram of the three-dimensional structure of a range hood according to another embodiment of the utility model;

[0079] Fig.13 It is a bottom view of a range hood according to another embodiment of the utility model. DETAILED DESCRIPTION

[0080] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0081] In the specification and claims of the present invention, terms indicating directions, such as "front", "rear", "up", "down", "left", "right", "side", "top", "bottom", etc., are used to describe various exemplary structural parts and elements of the present invention, but these terms are used here only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only used as explanations 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.

[0082] See also Figure 1-Figure 13 A range hood includes a fan frame 10, a smoke collecting hood 30, a fan system 20, an oil net and a smoke baffle.

[0083] The smoke hood 30 is connected to the bottom of the fan frame 10 and communicates with the internal space of the fan frame 10. The lateral dimension of the smoke hood 30 (i.e., the dimension in the left-right direction) is greater than the lateral dimension of the fan frame 10, i.e., the smoke hood 30 as a whole has shoulders protruding to the left and right sides relative to the fan frame 10. The fan system 20 is arranged in the fan frame 10 to provide negative pressure for sucking and exhausting oil smoke. The fan system 20 generally adopts a centrifugal fan, which includes a volute 21, an impeller 22, and a motor (not shown) for driving the impeller 22 to rotate. The impeller 22 is arranged in the volute 21, and its axis extends in the front-to-back direction. An air suction port 210 is opened on the front side wall of the volute 21. An air inlet duct 23 for external smoke to enter the air suction port 210 of the volute 21 is defined between the front side wall of the volute 21 and the front side plate of the fan frame 10.

[0084] See also Figure 1 The bottom of the smoke collecting hood 30 has a first smoke collecting chamber 31 and a second smoke collecting chamber 32 which are arranged at intervals on the left and right. The first smoke collecting chamber 31 and the second smoke collecting chamber 32 are both formed by being recessed upward. Among them, the first smoke collecting chamber 31 has a first side wall 311 and a second side wall 312 (i.e., a first guide wall and a second guide wall) which are opposite to each other in the left and right directions. The first side wall 311 is located on the left side, and the second side wall 312 is located on the right side. Among them, the first side wall 311 of the first smoke collecting chamber 31 is inclined to the left from top to bottom, and the second side wall 312 is inclined to the right from top to bottom. The first side wall 311 and the second side wall 312 extend upward and intersect at the top of the first smoke collecting chamber 31, that is, the vertical section of the first smoke collecting chamber 31 in the left and right directions is an inverted V shape. A first air inlet 3210 is provided on the second side wall 312 of the first smoke collecting chamber 31, and a first oil net 40 is installed at the first air inlet 3210 to filter the oil smoke. The second smoke collecting chamber 32 has a third side wall 321 and a fourth side wall 322 (i.e., a first guide wall and a second guide wall) opposite to each other in the left and right directions, the third side wall 321 is located on the left side, and the fourth side wall 322 is located on the right side, wherein the third side wall 321 of the second smoke collecting chamber 32 is inclined to the left from top to bottom, and the fourth side wall 322 is inclined to the right from top to bottom, and the third side wall 321 and the fourth side wall 322 extend upward and intersect at the top of the second smoke collecting chamber 32, that is, the vertical cross-section of the second smoke collecting chamber 32 in the left and right directions is also in an inverted V shape, and a second air inlet 3220 is provided on the third side wall 321 of the second smoke collecting chamber 32, and a second oil net 50 is installed at the second air inlet 3220 for filtering oil smoke.

[0085] The angle formed by the first side wall 311 of the first smoke collecting chamber 31 and the horizontal plane is recorded as the second angle, which is α2. The angle formed by the fourth side wall 322 of the second smoke collecting chamber 32 and the horizontal plane is recorded as the fourth angle, which is β2.

[0086] There are two smoke baffles, namely a first smoke baffle 60 and a second smoke baffle 70. The first smoke baffle 60 is arranged at the left side of the bottom open edge of the first smoke collecting chamber 31 of the smoke collecting hood 30, and the second smoke baffle 70 is arranged at the right side of the bottom open edge of the second smoke collecting chamber 32 of the smoke collecting hood 30.

[0087] The first smoke baffle 60 of this embodiment is a square plate structure, which has a first side 61 and a second side 62 that are opposite to each other in the left-right direction and extend in the front-back direction. The first smoke baffle 60 is basically rotatably connected to the left edge of the bottom opening of the first smoke collecting chamber 31 with its first side 61 as the rotation axis, and can open or close the bottom opening of the first smoke collecting chamber 31. For example, Figure 3 The first smoke baffle 60 is shown in the state of closing the bottom opening of the first smoke collecting chamber 31. In the open state, the first smoke baffle 60 is tilted leftward from top to bottom.

[0088] Specifically, the first angle between the first smoke baffle 60 in the open state and the horizontal plane is recorded as α1, wherein 5°<α1<30°, preferably 25°. The second angle α2 formed by the intersection between the first side wall 311 of the first smoke collecting chamber 31 and the horizontal plane is greater than the above-mentioned first angle α1, wherein 45°<α2<75°, preferably, α2 is 60°, so that the extension direction of the first smoke baffle 60 intersects with the area where the first air inlet 3210 of the first smoke collecting chamber 31 is located, thereby making it possible for the smoke flow flowing along the first smoke baffle 60 to enter the first air inlet 3210 in the first smoke collecting chamber 31 more smoothly and quickly, and then be quickly sucked and discharged, reducing the turbulence or collapse caused by the secondary impact of the smoke on the side wall of the smoke collecting chamber during the flow of the smoke, and effectively improving the suction and discharge efficiency of the oil smoke.

[0089] In the open state, the orthographic projection of the second side 62 of the first smoke baffle 60 on the horizontal plane is located outside the orthographic projection of the smoke hood 30 on the horizontal plane. Specifically, the size of the portion of the orthographic projection of the first smoke baffle 60 on the horizontal plane that is located outside the orthographic projection of the smoke hood 30 on the horizontal plane in the left-right direction is recorded as L1, and the size of the smoke hood 30 in the left-right direction is recorded as L, wherein 0<L1 / L<0.1. The above structural design ensures that the size of the portion of the first smoke baffle 60 exposed to the smoke hood 30 in the first open state and the second open state is not too large, and while achieving an increased smoke collection effect, in order to avoid the sense of spatial oppression caused by the corresponding smoke baffle in the open state, the user experience is improved.

[0090] Similar to the first smoke baffle 60 on the left, the second smoke baffle 70 of this embodiment is also a square plate structure, which has a third side 71 and a fourth side 72 that are opposite to each other in the left-right direction and extend in the front-back direction. The second smoke baffle 70 is rotatably connected to the right edge of the second smoke collecting chamber 32 with its third side 71 as the rotation axis, and can open or close the bottom opening of the second smoke collecting chamber 32. For example, Figure 3 FIG. 2 shows a state where the second smoke baffle 70 closes the bottom opening of the second smoke collecting chamber 32. In the open state, the second smoke baffle 70 is tilted rightward from top to bottom.

[0091] The third angle between the second smoke baffle 70 and the horizontal plane is denoted as β1, wherein 5°<β1<30°, preferably 25°. The value range of the fourth angle β2 formed by the intersection of the fourth side wall 322 of the second smoke collecting chamber 32 and the horizontal plane is 45°<β2<75°, preferably, β2 is 60°, so that the extension direction of the second smoke baffle 70 intersects with the area where the second air inlet 3220 of the second smoke collecting chamber 31 is located, thereby allowing the smoke flow flowing along the second smoke baffle 70 to enter the second air inlet 3220 in the second smoke collecting chamber 32 more smoothly and quickly, and then be quickly sucked and discharged, reducing the turbulence or collapse caused by the secondary impact of the smoke on the side wall of the second smoke collecting chamber 32 during the flow of the smoke, and effectively improving the suction and discharge efficiency of the oil smoke.

[0092] In the open state, the orthographic projection of the fourth side 72 of the second smoke baffle 70 on the horizontal plane is located outside the orthographic projection of the smoke hood 30 on the horizontal plane. Specifically, the size of the part of the orthographic projection of the second smoke baffle 70 on the horizontal plane that is located outside the orthographic projection of the smoke hood 30 on the horizontal plane in the left-right direction is recorded as L2, and the size of the smoke hood 30 in the left-right direction is recorded as L, wherein 0<L2 / L<0.1. The above structural design ensures that the size of the part of the second smoke baffle 70 exposed to the smoke hood 30 in the third open state and the fourth open state is not too large, and while achieving an increased smoke collection effect, in order to avoid the sense of spatial oppression caused by the second smoke baffle 70 in the open state, the user experience is improved.

[0093] The first smoke baffle 60 of this embodiment is driven by a first driving mechanism provided on the smoke hood 30 to deflect relative to the smoke hood 30, and the second smoke baffle 70 is driven by a second driving mechanism provided on the smoke hood 30 to deflect relative to the smoke hood 30. Among them, the first driving mechanism and the second driving mechanism can adopt various motion mechanisms in the prior art that can realize the deflection of the smoke baffle, such as a motion mechanism in which a motor (or electric push rod) cooperates with a hinge transmission, such as the "A Smoke Baffle Driving Mechanism for a Range Hood" with application number CN201621489054.X.

[0094] In a preferred embodiment, the range hood further includes an oil fume concentration detection device, which includes two oil fume sensors (not shown). The two oil fume sensors are used to detect the oil fume concentrations on the left and right sides of the bottom of the smoke hood 30, respectively. When the left oil fume sensor detects that the oil fume concentration on this side is less than a set value, and the right oil fume sensor detects that the oil fume concentration on this side is greater than the set value, it can be determined that no cooking operation is being performed on the left side, but cooking operation is being performed on the right side. On the contrary, it is determined that no cooking operation is being performed on the right side, but cooking operation is being performed on the left side. The above-mentioned oil fume concentration detection device is also electrically connected to the control system of the range hood, so that the control system adjusts the corresponding first smoke baffle 60 or the second smoke baffle 70 to the corresponding open state when the left or right oil fume concentration value transmitted by the oil fume concentration detection device is greater than the set value.

[0095] The opening direction of the first air inlet 311 and the second air inlet 321 correspondingly opened on the two smoke collecting chambers of this embodiment is basically toward the two burners on the stove, so that the oil smoke can quickly reach the corresponding air inlet 311; 321 during the rising process and be sucked and discharged. More specifically, the first oil net 40 is distributed with first ventilation holes 411, each of which is a strip hole and extends basically in the left-right direction. The second oil net 50 is distributed with second ventilation holes 511, which are also strip holes and extend basically in the left-right direction.

[0096] See also Figure 7 and Figure 8, the first oil net 40 is provided with a first buckle 48 on the left and right sides, which can be inserted into the slot at the first air inlet 311 during installation, so as to achieve the installation and fixation of the first oil net 40. Similarly, the second oil net 50 is provided with a second buckle 58 on the left and right sides, which can be inserted into the slot at the second air inlet 321 during installation, so as to achieve the installation and fixation of the second oil net 50. Both oil nets include a ventilation area 41; 51 and a closed area 42; 52 arranged in sequence in the left and right directions, wherein the ventilation area 41; 51 is away from the bottom central area of ​​the smoke hood 30 and has ventilation holes distributed thereon, while the closed area 42; 52 is adjacent to the bottom central area of ​​the smoke hood 30 and is a closed plate as a whole (airflow cannot pass through). The ventilation area 41; 51 and the closed area 42; 52 of the two oil nets 40; 50 can be divided by a straight line or curve extending along the front-to-back direction of the oil net. Specifically, the size of the rear part of the ventilation area 41 of the first oil net 40 (i.e., the part where the second area is located) in the left-right direction is basically the same, while the size of the front part (i.e., the part where the first area is located) in the left-right direction gradually increases from back to front. Similarly, the size of the rear part of the ventilation area 51 of the second oil net 50 (i.e., the part where the second area is located) in the left-right direction is basically the same, while the size of the front part (i.e., the part where the first area is located) in the left-right direction gradually increases from back to front. The above structural design allows the ventilation area 41; 51 of the oil net to extend to the left and right sides as much as possible, so that the oil smoke rising from the stove can quickly pass through the oil net and enter the range hood. At the same time, the closed area 42; 52 of the oil net is arranged adjacent to the bottom central area of ​​the smoke hood 30, reducing the ineffective air intake of the oil net in the bottom central area of ​​the smoke hood 30 (the area away from the stove head), thereby achieving a better flow distribution of the oil smoke in the left and right directions.

[0097] The first oil net 40 and the second oil net 50 of this embodiment are both plate-shaped, and the ventilation areas 41; 51 and the closed areas 42; 52 of the two oil nets are basically located on the same plane. The closed areas 42; 52 of the two oil nets are solid plate structures integrally formed on the corresponding oil nets.

[0098] like Fig.11As shown, in order to match the positions of the two burners on the stove and achieve better air volume distribution, the two burners arranged at intervals on the left and right of the stove below the range hood are respectively recorded as the first burner 81 and the second burner 82, and the first smoke collecting chamber 31 of the smoke collecting hood 30 is basically located directly above the first burner 81, and the second smoke collecting chamber 32 is basically located directly above the second burner 82. The ventilation areas 41; 51 of the two oil nets of this embodiment are far away from each other in the left and right directions, and the closed areas 42; 52 are arranged adjacent to each other, so that the effective ventilation areas of the first oil net 40 and the second oil net 50 can extend to the left and right sides as much as possible, so that the oil smoke rising from the stove can quickly pass through the oil net and enter the range hood. The closed area 42 of the first oil net 40 and the closed area 52 of the second oil net 50 can also receive the oil dripping from the fan system 20 to prevent the oil smoke from dripping onto the stove through the ventilation holes of the corresponding oil net. On the other hand, the setting of the closed area on the two oil nets can also isolate the noise generated during the operation of the fan system to a certain extent, reduce the noise propagating outward through the air inlet, and improve the sound quality of the range hood.

[0099] See also Figure 6 and Fig. 9 The outer peripheral edges of each first ventilation hole 411 of the first oil net 40 are bent and extended toward the back side (i.e., the inside of the smoke hood 30) by a first retaining edge 412. Similarly, the outer peripheral edges of each second ventilation hole 511 of the second oil net 50 are bent and extended toward the back side (i.e., the inside of the smoke hood 30) by a second retaining edge 512. The setting of the first retaining edge 412 and the second retaining edge 512 serves to block the oil, so that the oil accumulated on the back side of the first oil net 40 and the second oil net 50 will not flow out from the corresponding ventilation holes.

[0100] See also Figure 5 and Figure 8 The first oil net 40 and the second oil net 50 both include a first area 43; 53 located at the front side and a second area 44; 54 located at the rear side. The boundary line between the first area 43 and the second area 44 in the first oil net 40 is as shown in FIG. Figure 5 As shown in S1 in FIG. 1 , the boundary between the first area 53 and the second area 54 in the first oil net 50 is as shown in FIG. Figure 8As shown in S2 in []. Among them, the ratio of the area of the first region 43; 53 of each oil mesh to the overall area of the corresponding oil mesh is denoted as m, where the value range of m is: 1 / 5 < m < 2 / 5. Preferably, m = 1 / 3. The ratio of the total opening area of the first region 43; 53 of each oil mesh to the total area of the first region 43; 53 is a1, and the ratio of the total opening area of the second region 44; 54 of the oil mesh to the total area of the second region 44; 54 is a2, where a1 > a2. Specifically, the value range of the ratio of the total opening area of the first region 43; 53 of the oil mesh to the total area of the first region 43; 53 is: 60% < a1 < 90%, preferably, a1 = 70%. The value range of the ratio of the total opening area of the second region 44; 54 of the oil mesh to the total area of the second region 44; 54 is: 45% < a2 < 80%, preferably, a2 = 60%.

[0101] The dimension of the first regions 43; 53 of the first oil mesh 40 and the second oil mesh 50 in the front-rear direction is greater than the dimension of the second regions 44; 54 in the front-rear direction. Each ventilation hole located in the first region 43; 53 and each ventilation hole located in the second region 44; 54 on the two oil meshes 40; 50 are strip-shaped holes extending left and right. Among them, the widths of the ventilation holes in the second regions 44; 54 on the two oil meshes are basically the same, and the lengths of the ventilation holes in the first regions 43; 53 increase successively from back to front. Since the proportion of the opening area of the ventilation holes in the first region 43 on the front side of the first oil mesh 40 and the first region 53 on the front side of the second oil mesh 50 is relatively large, the oil fume can be timely sucked and discharged into the inside of the smoke collecting hood 30 before flowing to the front side of the bottom of the smoke collecting hood 30, avoiding the situation that the oil fume cannot be timely sucked and discharged during the large-scale rising process and escaping from the front side of the smoke collecting hood 30, realizing better flow distribution of the oil fume in the front-rear direction and improving the user experience.

[0102] See Fig.11The bottom of the smoke hood 30 corresponds to the plate body located between the first air inlet 311 and the second air inlet 321, which extends forward and backward and can be used to install the oil cup 33. The oil cup 33 is strip-shaped as a whole and extends in the front-to-back direction. The right edge of the closed area 42 of the first oil net 40 is located above the oil cup 33, and its orthographic projection on the horizontal plane falls into the oil cup 33. The left edge of the closed area 52 of the second oil net 50 is located above the oil cup 33, and its orthographic projection on the horizontal plane falls into the oil cup 33. The outer peripheral edge of the first oil net 40 is bent and extended toward the back of the first oil net 40 to form a first oil-blocking fold 470 for blocking oil, wherein the first smoke-blocking fold 470 corresponds to the part located on the right side where it connects with the main body of the first oil net 40 and is provided with first oil leakage holes 47 for oil dripping in sequence along the front-to-back direction. The outer peripheral edge of the second oil net 50 is bent and extended toward the back of the second oil net 50 to form a second oil-blocking fold 570 for blocking oil, wherein the second smoke-blocking fold 570 corresponding to the portion located on the right side connected to the main body of the second oil net 50 is provided with second oil leakage holes 57 for oil dripping in sequence along the front-to-back direction. The first oil net 40, the second oil net 50 and the oil cup 33 located therebetween together constitute the oil net assembly of this embodiment, wherein the ventilation area 41 of the first oil net 40 and the ventilation area 51 of the second oil net together constitute the ventilation area of ​​the oil net assembly, and the closed area 42 of the first oil net 40, the closed area 52 of the second oil net 50 and the above-mentioned oil cup 33 together constitute the closed area on the oil net assembly where smoke cannot pass. Considering that the area where oil is easy to fall is concentrated in the middle area in the left and right directions of the smoke hood, especially the annular wall of the volute 21 of the fan system 20 is an arc-shaped structure, under normal circumstances, the oil collected on the annular wall of the volute 21 does not necessarily drip at the lowest position of the annular wall of the volute 21, that is, the possibility of oil dripping exists in the area within a certain distance in the left and right directions with its lowest position as the center on the annular wall of the volute 21. In order to effectively block the oil, the area of ​​the closed area of ​​the oil net component and the size in the left and right directions need to be reasonably designed. If it is set too small, it cannot effectively block the dripping oil and sound insulation purposes. If it is set too large, it will seriously affect the air intake volume of the oil net. Specifically, the size of the orthographic projection of the closed area of ​​the oil net component on the horizontal plane in the left and right directions is recorded as D1, and the size of the orthographic projection of the oil net component as a whole on the horizontal plane in the left and right directions is recorded as D. Among them, 1 / 4<D1 / D, preferably, D1 / D=1 / 2. The area of ​​the closed area on the oil net assembly is recorded as S1, and the total area of ​​the oil net assembly is recorded as S, where 1 / 80 < S1 / S, preferably, S1 / S = 1 / 20. The above structural design, on the basis of ensuring the ventilation air volume of the oil net, also allows the closed area of ​​the oil net assembly to receive the oil dripping from the annular wall of the volute 21 of the fan system 20, and guide the oil to the oil cup 33 located between the two oil nets 40; 50, while reflecting part of the noise transmission. Of course, as another embodiment, such as Fig.12and Fig.13 As shown, the oil net assembly can also be an integrated oil net structure, that is, an air inlet is opened at the middle position of the bottom of the smoke hood 30, and the integrated oil net 4 is installed at the air inlet, and the middle part of the integrated oil net 4 has a closed plate area 402 with a large width at the rear and a small width at the front. The closed plate area 402 constitutes the closed area of ​​the oil net assembly, and the other areas are ventilation areas 401 with ventilation holes. Similarly, the left and right dimensions of the closed plate area 402 of the integrated oil net (that is, the closed area of ​​the oil net assembly) projected on the horizontal plane are recorded as D1, and the left and right dimensions of the integrated oil net as a whole projected on the horizontal plane are recorded as D, where the value range of D1 / D is: 1 / 4<D1 / D. The front-to-back dimension of the closed plate area 402 of the integrated oil screen in the horizontal plane is recorded as C1, and the front-to-back dimension of the integrated oil screen as a whole in the horizontal plane is recorded as C, wherein 1 / 20<C1 / C, preferably, C1 / C=1 / 10.

Claims

1. A range hood, comprising: The smoke collecting hood (30) has a smoke collecting cavity (31; 32) formed by being recessed upward at its bottom, and an air inlet (3210; 3220) for allowing external smoke to enter the smoke collecting hood (30) is provided on the inner wall of the smoke collecting cavity (31; 32); A smoke baffle (60; 70) is arranged at the open edge of the smoke collecting chamber (31; 32) of the smoke collecting hood (30), and is inclined from top to bottom toward the position where the outer peripheral edge of the smoke collecting hood (30) is located; It is characterized in that the extension direction of the portion of the smoke baffle (60; 70) adjacent to the open edge of the smoke collecting chamber (31; 32) intersects with the area where the air inlet (3210; 3220) on the smoke collecting chamber (31; 32) is located; The air inlet (3210; 3220) is provided with an oil net assembly, which includes a ventilation area with ventilation holes distributed thereon and a closed area through which smoke cannot pass, and the extension direction of the portion of the smoke baffle (60; 70) adjacent to the open edge of the smoke collecting chamber (31; 32) intersects with the ventilation area of ​​the oil net.

2. The range hood according to claim 1, characterized in that: The smoke baffle (60; 70) is rotatably connected to the open edge of the smoke collecting chamber (31; 32) with a horizontally extending axis as the rotation center, and has at least a closed state in which it is folded relative to the bottom of the smoke collecting hood (30) to close the bottom opening of the smoke collecting chamber (31; 32) and an open state in which it is unfolded relative to the bottom of the smoke collecting hood (30) to open the bottom opening of the smoke collecting chamber (31; 32). When the smoke baffle (60; 70) is in the open state, the smoke baffle (60; 70) is inclined from top to bottom toward the position of the outer peripheral edge of the smoke collecting hood (30), and the extension direction of the portion of the smoke baffle (60; 70) adjacent to the open edge of the smoke collecting chamber (31; 32) intersects with the area where the air inlet (3210; 3220) on the smoke collecting chamber (31; 32) is located.

3. The range hood according to claim 2, characterized in that: The rotation axis of the smoke baffle (60; 70) relative to the smoke collecting hood (30) basically extends along the front-to-back direction. When the smoke baffle (60; 70) is in the open state, the smoke baffle (60; 70) tilts from top to bottom toward the left or from top to bottom toward the right.

4. The range hood according to claim 3, characterized in that: The inner wall of the smoke collecting chamber (31; 32) is divided into a first guide wall and a second guide wall by a vertical plane passing through the top position of the smoke collecting chamber (31; 32) and extending in the front-to-back direction; the first guide wall and the second guide wall are both inclined from top to bottom relative to the vertical plane extending in the front-to-back direction; the inclination direction of the first guide wall is the same as the inclination direction of the smoke baffle (60; 70); the inclination direction of the second guide wall is opposite to the inclination direction of the smoke baffle (60; 70); the air inlet (3210; 3220) is provided on the second guide wall; and the smoke baffle (60; 70) is connected to a position on the bottom open edge of the smoke collecting chamber (31; 32) corresponding to the first guide wall.

5. The range hood according to any one of claims 2 to 4, characterized in that: The smoke collecting hood (30) has two smoke collecting chambers (31; 32) arranged at intervals on the left and right, respectively, the two smoke collecting chambers are a first smoke collecting chamber (31) located on the left and a second smoke collecting chamber (32) located on the right, a first air inlet (3210) is provided on the inner wall of the first smoke collecting chamber (31), and a second air inlet (3220) is provided on the inner wall of the second smoke collecting chamber (32), and the smoke baffles also have two, respectively, a first smoke baffle (60) provided at the open edge of the first smoke collecting chamber (31) and a second smoke baffle (70) provided at the open edge of the second smoke collecting chamber (32), when the first smoke baffle (60) is in the open state, the first smoke baffle (60) is inclined from top to bottom toward the left, and when the second smoke baffle (70) is in the open state, the second smoke baffle (70) is inclined from top to bottom toward the right.

6. The range hood according to claim 5, characterized in that: The first smoke collecting chamber (31) comprises a first side wall (311) and a second side wall (312) which are opposite to each other in the left-right direction; the first side wall (311) of the first smoke collecting chamber (31) is inclined to the left from top to bottom, and the second side wall (312) is inclined to the right from top to bottom; the first air inlet (3210) is provided on the second side wall (312) of the first smoke collecting chamber (31); and the inclination direction of the first smoke baffle (60) in an open state is the same as the inclination direction of the first side wall (311) of the first smoke collecting chamber (31); The second smoke collecting chamber (32) has a third side wall (321) and a fourth side wall (322) which are opposite to each other in the left-right direction; the third side wall (321) of the second smoke collecting chamber (32) is inclined to the left from top to bottom, and the fourth side wall (322) is inclined to the right from top to bottom; the second air inlet (3220) is provided on the third side wall (321) of the second smoke collecting chamber (32); and the inclination direction of the second smoke baffle (70) in the open state is the same as the inclination direction of the fourth side wall (322) of the second smoke collecting chamber (32).

7. The range hood according to claim 5, characterized in that: The angle between the first smoke baffle (60) in the open state and the horizontal plane is recorded as a first angle, and the angle between the first side wall (311) of the first smoke collecting chamber (31) and the horizontal plane is recorded as a second angle, and the first angle is smaller than the second angle; The angle between the second smoke baffle (70) in the open state and the horizontal plane is recorded as the third angle, and the angle between the fourth side wall (322) of the second smoke collecting chamber (32) and the horizontal plane is recorded as the fourth angle, and the third angle is smaller than the fourth angle.

8. The range hood according to claim 7, characterized in that: The first angle is denoted as α1, where 5°<α1<30°, and the second angle is denoted as α2, where 45°<α2<75°; The third angle is recorded as β1, wherein 5°<β1<30°, and the fourth angle is recorded as β2, wherein 45°<β2<75°.

9. The range hood according to claim 5, characterized in that: The orthographic projection of the second side edge (62) of the first smoke baffle (60) in the open state on the horizontal plane is located outside the orthographic projection of the smoke collecting hood (30) on the horizontal plane; The orthographic projection of the fourth side edge (72) of the second smoke baffle (70) in the open state on the horizontal plane is located outside the orthographic projection of the smoke collecting hood (30) on the horizontal plane.

10. The range hood according to claim 8, characterized in that: The dimension of the portion of the orthographic projection of the first smoke baffle (60) in the open state on the horizontal plane that is outside the orthographic projection of the smoke hood (30) on the horizontal plane in the left-right direction is recorded as L1, and the dimension of the smoke hood (30) in the left-right direction is recorded as L, wherein 0<L1 / L<0.1; The dimension of the portion of the orthographic projection of the second smoke baffle (70) in the open state on the horizontal plane outside the orthographic projection of the smoke hood (30) on the horizontal plane in the left-right direction is recorded as L2, and the dimension of the smoke hood (30) in the left-right direction is recorded as L, wherein 0<L2 / L<0.

1.

11. The range hood according to any one of claims 1 to 4, characterized in that: An oil net (40; 50) for filtering oil smoke is provided at the air inlet (3210; 3220).

12. A range hood, comprising: A smoke collecting hood (30), wherein the bottom of the smoke collecting hood (30) is provided with an air inlet for allowing external smoke to enter the smoke collecting hood (30); An oil net is arranged at the air inlet of the smoke collecting hood (30), and ventilation holes (411; 511) are distributed on the oil net; It is characterized in that: the oil net is provided with a first area (43; 53) and a second area (44; 54) with ventilation holes evenly distributed in the front-to-back direction of the smoke hood (30), wherein the first area (43; 53) is closer to the front side of the smoke hood (30) relative to the second area (44; 54), the size of the first area in the front-to-back direction is denoted as Y1, and the overall size of the oil net in the front-to-back direction is denoted as Y, wherein 10%≤Y1 / Y≤30%, the ratio of the total opening area of ​​the first area (43; 53) of the oil net to the total area of ​​the first area (43; 53) is a1, and the ratio of the total opening area of ​​the second area (44; 54) of the oil net to the total area of ​​the second area (44; 54) is a2, wherein a1>a2.

13. The range hood according to claim 12, characterized in that: The ratio of the total opening area of ​​the first region (43; 53) of the oil net to the total area of ​​the first region (43; 53) is in the range of: 60% <a1<90%; The ratio of the total opening area of ​​the second region (44; 54) of the oil net to the total area of ​​the second region (44; 54) is in the range of: 45% <a2<80%。 14. The range hood according to claim 12, characterized in that: The oil net also has a closed area through which smoke cannot pass, and the closed area (42; 52) is a plate structure integrally formed on the oil net.

15. The range hood according to claim 12, characterized in that: Each of the ventilation holes (411; 511) of the oil net is a strip-shaped hole extending in the left-right direction, and the outer peripheral edge of each ventilation hole (411; 511) is bent inwardly and extended to form a blocking edge (412; 512) for blocking oil.

16. A range hood, comprising: A smoke collecting hood (30), wherein the bottom of the smoke collecting hood (30) is provided with an air inlet for allowing external smoke to enter the smoke collecting hood (30); An oil screen assembly is arranged at the air inlet of the fume collecting hood (30); The oil net assembly is characterized in that: the oil net assembly comprises a ventilation area (41; 51) on which ventilation holes (411; 511) are distributed, and a closed area (42; 52) through which smoke cannot pass; The left and right dimensions of the orthographic projection of the closed area (42; 52) on the horizontal plane are recorded as D1, and the left and right dimensions of the orthographic projection of the entire oil screen assembly on the horizontal plane are recorded as D, wherein the value range of D1 / D is: 1 / 4<D1 / D.

17. The range hood according to claim 16, characterized in that: The front-to-back dimension of the orthographic projection of the closed area (42; 52) on the oil net assembly on the horizontal plane is recorded as C1, and the front-to-back dimension of the orthographic projection of the entire oil net assembly on the horizontal plane is recorded as C, wherein 1 / 20<C1 / C.

18. The range hood according to claim 16, characterized in that: The area of ​​the closed region (42; 52) on the oil net component is recorded as S1, and the total area of ​​the oil net component is recorded as S, wherein the value range is: 1 / 80<S1 / S.

19. The range hood according to claim 16, characterized in that: The range hood further comprises a volute (21), wherein the orthographic projection of the volute (21) on a horizontal plane at least partially overlaps with the orthographic projection of the closed area of ​​the oil screen assembly on the horizontal plane, the size of the overlapping area in the left-right direction is denoted as M1, and the left-right size of the orthographic projection of the entire volute on the horizontal plane is denoted as M, wherein M1 / M≥50%.

20. A range hood, comprising: A smoke collecting hood (30), wherein the bottom of the smoke collecting hood (30) is provided with an air inlet for allowing external smoke to enter the smoke collecting hood (30); An oil net is arranged at the air inlet of the smoke collecting hood (30), and ventilation holes (411; 511) are distributed on the oil net; The oil net is characterized in that: the oil net comprises a first area (43; 53) and a second area (44; 54) which are arranged in sequence from front to back and both are provided with ventilation holes, and the ratio of the total area of ​​the first area (43; 53) of the oil net to the overall area of ​​the oil net is denoted as m, wherein the value range of m is: 1 / 5<m<2 / 5; The ratio of the total opening area of ​​the first region (43; 53) of the oil net to the total area of ​​the first region (43; 53) is a1, and the ratio of the total opening area of ​​the second region (44; 54) of the oil net to the total area of ​​the second region (44; 54) is a2, wherein a1>a2; The oil net also includes a ventilation area (41; 51) on which ventilation holes (411; 511) are distributed and a closed area (42; 52) which is a closed plate body as a whole. The left and right dimensions of the orthographic projection of the closed area (42; 52) on the horizontal plane are recorded as D1, and the left and right dimensions of the orthographic projection of the oil net as a whole on the horizontal plane are recorded as D; the front and back dimensions of the orthographic projection of the closed area (42; 52) on the oil net on the horizontal plane are recorded as C1, and the front and back dimensions of the orthographic projection of the oil net as a whole on the horizontal plane are recorded as C. The area of ​​the closed area (42; 52) on the oil net is recorded as S1, and the total area of ​​the oil net is recorded as S, wherein 1 / 4<D1 / D, 1 / 20<C1 / C, and 1 / 80<S1 / S.

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