Range hood

Abstract

The utility model discloses a range hood which comprises an exhaust fume collecting hood, a filter screen assembly, a fan frame arranged on the exhaust fume collecting hood and a fan system arranged in the fan frame, an air inlet is formed in the exhaust fume collecting hood, the filter screen assembly comprises an outer filter screen and an inner filter screen, the outer filter screen is arranged at the air inlet, and the inner filter screen is arranged at the air inlet. The inner filter screen is arranged above the outer filter screen at intervals and is positioned below the fan system; the inner filter screen comprises a filter screen body, ribs formed in the middle of the filter screen body and meshes formed in the filter screen body, the width of the inner filter screen in the left-right direction is d, the width of the ribs in the left-right direction is d1, and d1 / d is equal to 10-20%. Compared with the prior art, the utility model has the advantages that the rib in the middle is wider to block a channel for air to enter a fan system from the middle position, so that more flow is distributed to the left side and the right side, and the negative pressure area is diffused to the left side and the right side, so that the range of the negative pressure area covers the positions of two burners of the stove; the oil smoke suction effect is improved.

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] In order to improve the oil fume suction effect and receive the oil dripping from the fan system, the existing range hoods usually have an internal filter under the fan system. For example, the Chinese patent application No. 201920307416.6 discloses a range hood with an open three-dimensional mesh filter, which includes a casing, a box body, a fan, a glass panel, an oil net and an oil cup, and also includes a partition and an open three-dimensional mesh filter plate. The partition is provided with a smoke guide hole, and the rear end of the partition extends into the casing through the connection between the box body and the casing to connect with the machine. The back plate of the shell is connected, and the front end extends into the box body and is connected to the front wall plate of the front box body; the open three-dimensional mesh filter plate is detachably connected to the covering smoke guide hole and the partition; for example, a range hood filter device disclosed in Chinese patent application No. 201720190947.2 includes a wind cabinet box, and a filter is arranged in the wind cabinet box. The filter is divided into an outer net and an inner net. There is a gap between the outer net and the inner net, and they are separated from each other. The outer net is recessed into the inside of the wind cabinet box, and the inner net is located on the side of the outer net relative to the wind cabinet box.

[0004] In the above-mentioned existing range hood, the air inlet of the fan faces forward, and usually the width of the air inlet of the fan is only 300 to 400 mm. Conventional household stoves are designed with double burners, and the width of the air inlet is much smaller than the width of the stove. The diffusion range of the oil smoke rising from the two burners exceeds the negative pressure zone of the fan, and the desired oil suction effect cannot be obtained. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a range hood to improve the range hood absorbing effect in view of the deficiencies in the above-mentioned prior art.

[0006] The utility model solves the above technical problems by adopting the following technical solution: a range hood, comprising a smoke collecting hood, a filter assembly, a fan frame arranged on the smoke collecting hood, and a fan system arranged in the fan frame, wherein an air inlet is formed on the smoke collecting hood, the filter assembly comprises an outer filter and an inner filter, the outer filter is arranged at the air inlet, and the inner filter is arranged above the outer filter at intervals and below the fan system; the characteristics are:

[0007] The inner filter includes a filter body, ribs formed in the middle of the filter body and mesh holes opened on the filter body. The left-right width of the inner filter is d, the left-right width of the ribs is d1, and d1 / d=10-20% is satisfied.

[0008] By making the ribs in the middle of the inner filter wider, the air inlet channel can be optimized for the second time. Since the wider ribs in the middle block the channel for air to enter the fan system from the middle position, the flow is distributed more to the left and right sides, causing the negative pressure zone to diffuse to the left and right sides. The negative pressure zone can thus cover the positions of the two burners of the stove, and the oil smoke rising from the two burners can be smoothly sucked into the range hood, thereby improving the oil smoke extraction effect.

[0009] Furthermore, first guide plates are respectively arranged on the left and right sides of the inner filter, and the two first guide plates gradually extend toward each other from bottom to top, thereby utilizing the first guide plates to expand the negative pressure area outwards.

[0010] Preferably, the inner filter gradually extends downward from front to back and is at least partially located in the smoke hood, the first guide plate on the left side extends upward from the left edge of the air inlet to the bottom of the left wall of the fan rack, and the first guide plate on the right side extends upward from the right edge of the air inlet to the bottom of the right wall of the fan rack.

[0011] Preferably, the left-right width of the filter body on the left side of the rib is d2, the left-right width of the filter body on the right side of the rib is d3, the left-right width of the first guide plate is d5, and d2 / d5=0.75~1, d3 / d5=0.75~1 are satisfied. This avoids the first guide plate from being too large relative to the inner filter, causing the negative pressure zone to fail to diffuse well to the edges on both sides, but to be concentrated in the middle area, resulting in a non-smooth transition and uneven negative pressure distribution. It also avoids the first guide plate from being too small relative to the inner filter, weakening the effect of diffusion from the ribs to both sides, and causing the negative pressure zone to not diffuse much.

[0012] Preferably, the axis of the fan system extends forward and backward, and the fan system includes a first suction port facing forward.

[0013] Preferably, in order to facilitate guiding the oil smoke forward and upward into the first suction port, a second guide plate is provided on the front side of the smoke collecting hood, the second guide plate gradually tilts downward from front to back, and the second guide plate is at least partially spaced below the inner filter.

[0014] Furthermore, to ensure smooth front air inlet passage, the horizontal distance between the front end of the fan system and the front side wall of the fan frame is L2, the distance between the front end of the inner filter and the second guide plate is L3, and L3 / L2=1~1.2 is satisfied.

[0015] Furthermore, the angle between the inner filter and the horizontal direction is α, the angle between the second guide plate and the horizontal direction is β, and β-α=10~30°, thereby the channel gradually decreases along the oil fume flow path, so that the transition can be gradually accelerated, thereby improving the oil fume absorption effect and reducing resistance.

[0016] Preferably, the second guide plate extends obliquely downward from the front bottom of the fan rack toward the front edge of the air inlet.

[0017] Furthermore, the fan system also includes a second suction port facing backwards, the horizontal distance between the rear end of the fan system and the rear side wall of the fan rack is L1, the horizontal distance between the front end of the fan system and the front side wall of the fan rack is L2, and L1>L2 is satisfied, thereby ensuring the air volume of the main suction port.

[0018] Preferably, in order to facilitate the fixation of the inner filter and better utilize the negative pressure area expanding inside and outside the smoke hood, the front end of the inner filter is fixed to the bottom of the front end of the fan system, and the rear end of the inner filter is fixed to the rear wall of the smoke hood.

[0019] Compared with the prior art, the utility model has the advantages that: by making the ribs in the middle of the inner filter wider, the air inlet channel can be optimized secondary. Since the ribs in the middle are wider, the channel for air to enter the fan system from the middle position is blocked, so that the flow is distributed more to the left and right sides, and the negative pressure area is diffused to the left and right sides, so that the range of the negative pressure area can cover the positions of the two burners of the stove, and the oil smoke rising from the two burners can be smoothly sucked into the range hood, thereby improving the oil smoke extraction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of a range hood according to an embodiment of the utility model;

[0021] Figure 2 A schematic diagram of a range hood with hidden external filter and smoke baffle in an embodiment of the utility model;

[0022] Figure 3 It is a cross-sectional view (front-to-back cross-section) of a range hood according to an embodiment of the utility model;

[0023] Figure 4 It is a cross-sectional view (left-right cross-section) of a range hood according to an embodiment of the utility model;

[0024] Figure 5 It is a schematic diagram of the inner filter of the range hood according to an embodiment of the utility model. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] See also Figure 1 to Figure 5 A range hood includes a fume hood 1, a fan frame 2 disposed on the fume hood 1, and a fan system 3 disposed in the fan frame 2, wherein the fan system 3 is preferably a centrifugal fan. The axis X of the fan system 3 extends in the front-to-back direction, preferably horizontally, and the fan system 3 includes a first suction port 31 facing forward, and may also include a second suction port 32 facing backward, in which case the second suction port 32 is a main suction port and the first suction port 31 is a secondary suction port, and the amount of oil smoke sucked in through the second suction port 32 is greater than that of the first suction port 31.

[0028] An air inlet 11 is formed on the smoke hood 1. In this embodiment, the bottom of the smoke hood 1 gradually tilts downward from the front to the back, and the air inlet 11 is opened on the tilted bottom. The top of the smoke hood 1 is connected to the fan frame 2 and is opened at the connection, so that the air inlet 11 and the fan frame 2 are fluidically connected, so that the fan system 3 can inhale oil smoke through the air inlet 11. The range hood also includes a smoke baffle 5 that can open and close the air inlet 11. The movement form of the smoke baffle 5 can be the same as commonly used in the art, such as a flipping movement. An oil cup 6 is provided at the rear bottom of the smoke hood 1.

[0029] The range hood further includes a filter assembly, which includes an outer filter 41 and an inner filter 42, wherein the outer filter 41 is arranged at the air inlet 11, and the inner filter 42 is arranged above the outer filter 41 at intervals (not necessarily completely opposite). The inner filter 42 can be completely arranged in the fan frame 2 or partially located in the fan frame 2 and partially located in the smoke hood 1. The inner filter 42 is located below the fan system 3 and gradually tilts downward from front to back. Preferably, the outer filter 41 and the inner filter 42 are both grille meshes.

[0030] The flow channel below the fan system 3 in the fan frame 2 has a flow channel cross-sectional area of ​​S1 when the inner filter 42 is installed, and a flow channel cross-sectional area of ​​S2 when the inner filter 42 is not installed. Under the same flow rate Q, the cross-sectional flow velocity after the inner filter 42 is installed is V1, and the cross-sectional flow velocity when the inner filter 42 is not installed is V2. According to the flow calculation formula Q = V1 * S1 = V2 * S2, the preferred S1 / S2 = 0.7 in the utility model, V1 = 1.43V2 can be obtained. That is, by installing the inner filter 42, the flow velocity at each suction port of the fan system 3 can be increased by about 43%.

[0031] The inner filter 42 includes a filter body 421, a rib 422 formed in the middle of the filter body 421, and a mesh 423 provided on the filter body 421. The mesh 423 is in the shape of an elongated strip, and the rib 422 and the mesh 423 both extend in the front-to-back direction. The total width of the inner filter 42 in the left-right direction is d, the width of the rib 422 in the left-right direction is d1, the width of the filter body 421 in the left-right direction on the left side of the rib 422 is d2, and the width of the filter body 421 in the left-right direction on the right side of the rib 422 is d3, d=d1+d2+d3. Preferably, d=350mm, which can be adjusted according to the size of the second suction port 32 of the fan system 3.

[0032] The left and right sides of the inner filter 42 are respectively provided with first guide plates 71. The two first guide plates 71 can be arranged in the smoke hood 1. The two first guide plates 71 gradually extend toward each other from bottom to top. At this time, the inner filter 42 is at least partially located in the smoke hood 1. The left first guide plate 71 extends upwardly from the left edge of the air inlet 11 to the bottom of the left wall of the fan frame 2, and the right first guide plate 71 extends upwardly from the right edge of the air inlet 11 to the bottom of the right wall of the fan frame 2. The total width of the air inlet 11 in the left-right direction is d4, and the width of each first guide plate 71 in the left-right direction is d5, d4=d+2*d5.

[0033] A second guide plate 72 is provided at the front side of the smoke hood 1, and the second guide plate 72 gradually tilts downward from the front to the back, and the second guide plate 72 is at least partially spaced below the inner filter 42. In this embodiment, the second guide plate 72 extends downward from the front bottom of the fan frame 2 to the front edge of the air inlet 11.

[0034] Preferably, d1 / d=10-20%, that is, the middle rib 422 is wider, thereby the air inlet channel can be optimized twice. Since the middle rib 422 is wider, it blocks the air from entering the fan system 3 from the middle position, so that the flow is more distributed to the left and right sides, so that the negative pressure area spreads to the left and right sides, so that the range of the negative pressure area can cover the positions of the two burners of the stove, and the oil smoke rising from the two burners is smoothly sucked into the range hood, improving the oil smoke extraction effect. Combined with the guide plates on the left and right sides, the negative pressure area can be spread more smoothly in the width direction of the range hood. Preferably, d2 / d5=0.75~1, d3 / d5=0.75~1, to prevent the width of the first guide plate 71 from being too large relative to the inner filter 42. Otherwise, the negative pressure zone cannot be well diffused to the edges on both sides, but will be concentrated in the middle area, resulting in a non-smooth transition and uneven negative pressure distribution. If the width of the first guide plate 71 is too small relative to the inner filter 42, the effect of diffusion from the ribs 422 to both sides will be weakened, and the negative pressure zone will not diffuse much.

[0035] The fan system 3 also includes a volute 33, an impeller 34 disposed in the volute 33, and a motor 35 for driving the impeller 34 to rotate. The second suction port 32 and the first suction port 31 are disposed on the volute 33. The horizontal distance between the rear end of the volute 33 (i.e., the rear end of the fan system 3) and the rear side wall of the fan frame 2 is L1, and the horizontal distance between the front end of the volute 33 (i.e., the front end of the fan system 3) and the front side wall of the fan frame 2 is L2. Thus, the air inlet channel is divided into front and rear sides. In this embodiment, the second suction port 32 is used as the main air inlet form, so it is necessary to satisfy L1>L2 to ensure that the main air inlet channel is large enough. When the inner filter 42 is not provided, after the oil smoke enters the fan frame 2 from the air inlet 11, the airflow collides with the bottom of the volute 33 and is divided into front and rear two streams to enter the volute 33. This air intake method has a large loss on the gas flow rate. After the inner filter 42 is installed, since the inner filter 42 is a grille structure, part of the airflow can enter the volute 33 upward and forward along the flow path formed between the inner filter 42 and the second guide plate 72. Since the inner filter 42 is inclined (the angle between the inner filter 42 and the horizontal direction is α, and α can be selected to be 10 to 30°, which can be adjusted according to different models), the loss of gas flow rate is small and the air intake efficiency will be higher, thereby achieving the effect of improving the oil fume absorption effect.

[0036] The front end of the inner filter 42 is fixed to the bottom of the front end of the volute 33, and the rear end of the inner filter 42 can be fixed to the rear wall of the smoke hood 1. The distance between the front end of the inner filter 42 and the second guide plate 72 is L3 (a vertical line from any point on the front end of the inner filter 42 to the second guide plate 72 is L3). To ensure smooth front air inlet passage, preferably, L3 / L2=1~1.2. The front air inlet passage refers to the passage through which the oil smoke passes through the outer filter 41, the second guide plate 72 and the inner filter 42, and finally enters the interior of the fan system 3 from the front side of the volute 33.

[0037] The angle between the second guide plate 72 and the horizontal direction is β, and the front air inlet channel from the volute 33 to the second guide plate 72 and then to the outer filter 41 tends to gradually expand, satisfying β-α=10~30°, that is, along the oil fume flow path, the channel gradually decreases, so that the transition can be gradually accelerated, thereby improving the oil fume absorption effect and reducing resistance.

[0038] 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 smoke hood (1), a filter assembly, a fan frame (2) arranged on the smoke hood (1), and a fan system (3) arranged in the fan frame (2), wherein the smoke hood (1) is formed with an air inlet (11), the filter assembly comprises an outer filter (41) and an inner filter (42), the outer filter (41) being arranged at the air inlet (11), and the inner filter (42) being arranged above the outer filter (41) at intervals and below the fan system (3); characterized in that: The inner filter (42) comprises a filter body (421), a rib (422) formed in the middle of the filter body (421), and mesh holes (423) opened on the filter body (421), the left-right width of the inner filter (42) is d, the left-right width of the rib (422) is d1, and d1 / d=10-20% is satisfied.

2. The range hood according to claim 1, characterized in that: First guide plates (71) are respectively arranged on the left and right sides of the inner filter screen (42), and the two first guide plates (71) extend gradually towards each other from bottom to top.

3. The range hood according to claim 2, characterized in that: The inner filter (42) gradually extends downward from front to back and is at least partially located in the smoke hood (1); the first guide plate (71) on the left side extends upwardly and tiltedly from the left side edge of the air inlet (11) to the bottom of the left side wall of the fan frame (2); and the first guide plate (71) on the right side extends upwardly and tiltedly from the right side edge of the air inlet (11) to the bottom of the right side wall of the fan frame (2).

4. The range hood according to claim 2, characterized in that: The left-right width of the filter body (421) on the left side of the rib (422) is d2, the left-right width of the filter body (421) on the right side of the rib (422) is d3, the left-right width of the first guide plate (71) is d5, and d2 / d5=0.75-1, d3 / d5=0.75-1 are satisfied.

5. The range hood according to claim 1, characterized in that: The axis of the fan system (3) extends forward and backward, and the fan system (3) comprises a first suction port (31) facing forward.

6. The range hood according to claim 5, characterized in that: A second guide plate (72) is arranged at the front side of the smoke collecting hood (1), the second guide plate (72) gradually tilts downward from front to back, and the second guide plate (72) is at least partially spaced below the inner filter (42).

7. The range hood according to claim 6, characterized in that: The horizontal distance between the front end of the fan system (3) and the front wall of the fan frame (2) is L2, the distance between the front end of the inner filter (42) and the second guide plate (72) is L3, and L3 / L2=1-1.2 is satisfied.

8. The range hood according to claim 6 or 7, characterized in that: The included angle between the inner filter (42) and the horizontal direction is α, the included angle between the second guide plate (72) and the horizontal direction is β, and β-α=10-30° is satisfied.

9. The range hood according to claim 6, characterized in that: The second guide plate (72) extends obliquely downward from the front bottom of the fan frame (2) toward the front edge of the air inlet (11).

10. The range hood according to claim 5, characterized in that: The fan system (3) further comprises a second suction port (32) facing backwards, the horizontal distance between the rear end of the fan system (3) and the rear side wall of the fan frame (2) is L1, the horizontal distance between the front end of the fan system (3) and the front side wall of the fan frame (2) is L2, and L1>L2 is satisfied.

11. The range hood according to claim 1, characterized in that: The front end of the inner filter (42) is fixed to the bottom of the front end of the fan system (3), and the rear end of the inner filter (42) is fixed to the rear wall of the smoke hood (1).

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