Range hood

Abstract

The utility model discloses a range hood which comprises an exhaust fume collecting hood, a fan frame arranged on the exhaust fume collecting hood and a fan system arranged in the fan frame, the exhaust fume collecting hood comprises an air inlet, a filter screen is arranged at the air inlet, and the fan system comprises a forward first suction inlet; the filter screen comprises a first part and a second part which are integrated, the first part gradually inclines upwards from front to back, the second part gradually inclines downwards from the rear side end of the first part, the filter screen further comprises meshes, the meshes are at least formed in the first part, the front-back length of the projection of the first part on the horizontal plane is d1, and the length of the projection of the first part on the horizontal plane is d2. And the front and back length of the projection of the second part on the horizontal plane is d2, and d1 is greater than d2. Compared with the prior art, the range hood has the advantages that through the two-part design of the filter screen, oil smoke can be guided to the first suction inlet on the front side, flow distribution is completed, and 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] Commonly used range hoods include top suction type and side suction type. Top suction range hoods have the characteristic that the thicker the cavity, the stronger the smoke trapping effect. However, the thick cavity not only affects the appearance but also the cooking experience of the cook. For the sake of beauty, the cavity can only be thinned, which requires increasing the speed of the motor and impeller in the fan system by increasing the current, increasing the pressure and wind speed under the range hood, increasing power consumption and generating greater noise; or as disclosed in the Chinese patent application number 201611171820.2 of the applicant, the filter adopts a concave structure, which can expand the depth of the smoke trapping cavity while ensuring the reduction of the thickness of the smoke hood, but this structure cannot form a good flow distribution method in combination with the fan, resulting in low efficiency. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a range hood to address the deficiencies of the above-mentioned prior art, increase the negative pressure, and improve the efficiency of extracting fume through flow distribution.

[0005] The utility model solves the above technical problems by adopting the following technical solution: a range hood, comprising a fume hood, a fan frame arranged on the fume hood, and a fan system arranged in the fan frame, the fume hood comprising an air inlet, a filter screen being arranged at the air inlet, and the fan system comprising a first suction port facing forward; the characteristics are:

[0006] The filter screen includes an integrated first part and a second part, the first part gradually tilts upward from front to back, and the second part gradually tilts downward from the rear end of the first part. The filter screen also includes mesh holes, at least in the first part. The front-to-back length of the projection of the first part on the horizontal plane is d1, and the front-to-back length of the projection of the second part on the horizontal plane is d2, and d1>d2 is satisfied.

[0007] By making the projection length of the first part greater than that of the second part, when the cooking fume rises upward, as it flows upward along the first part, due to the long flowing distance along the first part, that is, the long travel distance, the contact area with the first part is large during the flowing process, and the front-side pressure is large. Therefore, it has been sucked upward by the fan system before flowing to the second part. When the cooking fume flows upward along the second part, due to the short flowing distance, that is, the short travel distance, it has flowed to the first part before being sucked upward by the fan system. Thus, through the above filter structure design, the cooking fume can be guided to the first suction port at the front side, the flow rate distribution can be completed, and the cooking fume suction effect can be improved.

[0008] Preferably, to further ensure sufficient air volume at the front side, d1 and d2 satisfy the following relationship:

[0009] Further, the smoke collecting hood includes an inner hood, and the inner hood is in a shape that slopes upward from the periphery to the middle to form an upwardly concave smoke gathering cavity, and the air inlet is formed in the middle of the inner hood, thereby facilitating the smoke gathering of the smoke collecting hood.

[0010] Further, the inclination angle of the first part with respect to the horizontal plane is α, and the inclination angle β of the connection line between the front end of the inner hood of the smoke collecting hood and the front end of the first part with respect to the horizontal plane, and α = β. Thus, during the process of the cooking fume entering the filter, the same inclination angle can ensure that the cooking fume enters in a straight line, reduce the resistance during the entering process, and is more conducive to the absorption of the cooking fume.

[0011] According to one aspect of the present invention, the second part also has the mesh holes, and the opening ratio of the filter is 70% - 85%, so as to ensure that all the cooking fume can be sucked upward when passing through the first part, and also avoid the cooking fume flowing from the first part to the second part and impacting the second part.

[0012] Further, the fan system includes a volute and an impeller disposed in the volute. The vertical distance between the bottom of the volute and the horizontal plane where the lowest position of the filter is located is L1, and the vertical distance between the highest position and the lowest position of the filter is L2. The highest position of the filter is the junction of the first part and the second part, and 0.5L1 < L2 < 0.8L1, which not only effectively ensures the rotation of the impeller, but also increases the pressure at the gap between the filter and the volute, and the smoking effect is significantly enhanced.

[0013] According to another aspect of the present invention, the mesh holes are only formed in the first part, and the opening ratio of the filter is 50% - 60%. The local pressure wind speed of the first part increases, the air volume becomes larger, the pressure becomes larger, and the cooking fume suction effect is significantly improved.

[0014] Further, the fan system includes a volute, an impeller disposed within the volute, and an oil drip nozzle disposed at the bottom of the volute. The horizontal distance between the oil drip nozzle and the rear side wall of the fan frame is D2, and the horizontal distance between the highest position of the filter screen and the rear side wall of the fan frame is D1. The highest position of the filter screen is the junction of the first part and the second part, and D1 > 1.1D2 is satisfied, so as to ensure that the oil stain is guided backward after falling from the volute into the second part of the filter screen, so as to flow into the oil cup or other oil collecting structures, and avoid direct downward dripping.

[0015] Further, the fan system includes a volute and an impeller disposed within the volute. The vertical distance between the bottom of the volute and the horizontal plane where the lowest position of the filter screen is located is L1, and the vertical distance between the highest position and the lowest position of the filter screen is L2. The highest position of the filter screen is the junction of the first part and the second part, and 0.5L1 < L2 < 0.8L1 is satisfied, which not only effectively ensures the rotation of the impeller, but also increases the pressure at the gap between the filter screen and the volute, and the smoking effect is significantly enhanced.

[0016] Further, the first part includes a mesh part and closed parts located on the left and right sides of the mesh part. The mesh holes are only formed in the mesh part. Since the air volume on the left and right sides is small, by providing closed parts on the left and right sides, the pressure at the mesh part can be increased, and the suction of oil fume can be promoted.

[0017] Preferably, the left - right width of the first part is D, and the left - right width of each closed part is d, and 0.08 ≤ d / D ≤ 0.16 is satisfied.

[0018] Further, the fan system further includes a second suction port facing backward. The first suction port is the main suction port and the second suction port is the secondary suction port, thereby increasing the oil fume inhaled by the fan system.

[0019] Compared with the prior art, the advantages of the present utility model are as follows: By making the projection length of the first part greater than that of the second part, when the oil fume rises, when it flows upward along the first part, due to the long distance of flowing along the first part, that is, the long travel distance, the contact area with the first part is large during the flowing process, and the front - side pressure is large. Therefore, it has been sucked upward by the fan system before flowing to the second part. When the oil fume flows upward along the second part, due to the short flowing distance, that is, the short travel distance, it has flowed to the first part before being sucked upward by the fan system. Thus, through the above - mentioned filter screen structure design, the oil fume can be guided to the first suction port on the front side, the flow rate distribution can be completed, and the oil fume suction effect can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a range hood according to the first embodiment of the present utility model;

[0021] Figure 2 It is a cross-sectional view of a range hood according to a first embodiment of the utility model;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the filter screen of the range hood according to the first embodiment of the utility model;

[0023] Figure 4 A schematic diagram of a smoke collecting hood of a range hood according to a first embodiment of the utility model;

[0024] Figure 5 It is a cross-sectional view of a range hood according to a second embodiment of the utility model;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the filter screen of the range hood according to the second embodiment of the utility model;

[0026] Figure 7 This is a top view of the filter screen of a range hood according to the second embodiment of the utility model. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] Embodiment 1

[0030] See also Figure 1 to Figure 4A range hood is a top suction range hood, comprising a fume hood 1, a fan frame 2 arranged on the fume hood 1, and a fan system 3 arranged 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, or the fan system 3 may also include a second suction port 32 facing backward, in which case the first suction port 31 is a main suction port and the second suction port 32 is an auxiliary suction port, and the amount of oil smoke sucked in through the first suction port 31 is greater than that of the second suction port 32.

[0031] The smoke collecting hood 1 includes an inner hood 11, side panels 12 extending upward from the periphery of the inner hood 11, and a top panel 13 covering the top of the side panels 12. The inner hood 11 is in a shape that tilts upward from the periphery to the middle, forming a concave smoke collecting chamber 111, and an air inlet 14 is formed in the middle of the inner hood 11. The "middle" here does not require to be the geometric center of the inner hood 11, but only means that it is not the periphery. The top panel 13 is located above the inner hood 11 and is connected to the fan frame 2 and is open at the connection, so that the air inlet 14 can be fluidly connected with the fan frame 2, so that the fan system 3 can inhale oil smoke through the air inlet 14.

[0032] The range hood further includes a filter 4 disposed at the air inlet 14. The filter 4 is generally concave in the direction of the fan frame 2, thereby expanding the depth of the smoke collecting chamber and improving the smoke absorption effect. The filter 4 includes an integrally formed first part 41 and a second part 42. Both parts have meshes 43. The first part 41 gradually tilts upward from front to back, while the second part 42 gradually tilts downward from the rear end of the first part 41. The junction between the first part 41 and the second part 42 is the highest position of the filter 4. The front-to-back length of the projection of the first part 41 on the horizontal plane is d1, and the front-to-back length of the projection of the second part 42 on the horizontal plane is d2, and d1>d2. It is preferred that When the oil smoke rises upward, it flows upward along the first part 41. Since the distance it flows along the first part 41 is long, that is, the stroke is long, during the flow process, the contact area with the first part 41 is large, and the front pressure is large. Therefore, before it flows to the second part 42, it has been sucked upward by the fan system 3. When the oil smoke flows upward along the second part 42, since the flow distance is short, that is, the stroke is short, it has flowed to the first part 41 before it is sucked upward by the fan system 3. Therefore, through the structural design of the filter 4, the oil smoke can be guided to the first suction port 31 on the front side, the flow distribution is completed, and the oil smoke absorption effect is improved.

[0033] The opening rate of the mesh 43 of the filter 4 is 70% to 85% to ensure that the oil smoke can be completely sucked upward when passing through the first part 41 and to prevent the oil smoke from flowing from the first part 41 to the second part 42 and impacting the second part 42 .

[0034] The inclination angle of the first part 41 with respect to the horizontal plane is α. The inclination angle β of the connection line between the front end of the inner cover 11 of the smoke collecting hood 1 (i.e., the front end of the smoke gathering cavity 111) and the front end of the first part 41 (the connection line here is the connection line between the points on the smoke collecting hood 1 and the points on the first part 41 within the same front-rear vertical plane), and α = β is satisfied. Thus, during the process of oil fume entering the filter screen 4, the same inclination angle can ensure that the oil fume enters in a straight line, reducing the resistance during the entry process and being more conducive to the absorption of oil fume.

[0035] The fan system 3 includes a volute 33, an impeller 35 disposed within the volute 33, and a motor 36 for driving the impeller 35 to rotate. The vertical distance between the bottom of the volute 33 and the horizontal plane where the lowest position of the filter screen 4 is located is L1, and the vertical distance between the junction of the first part 41 and the second part 42 of the filter screen 4 (the highest position of the filter screen 4) and the horizontal plane where the lowest position of the filter screen 4 is located is L2, and 0.5L1 < L2 < 0.8L1 is satisfied. If L2 is too small, it cannot achieve the effect of increasing the depth of the smoke gathering cavity and cannot effectively achieve the diversion effect. When L2 is selected within the above range, not only can the rotation of the impeller 35 be effectively ensured, but also the pressure at the gap between the filter screen 4 and the volute 33 is increased, and the smoking effect is significantly enhanced.

[0036] Embodiment Two

[0037] See Figure 5 to Figure 7 , in this embodiment, the difference from the above Embodiment One is that the second part 42 does not have mesh holes 43. Thus, the second part 42 is not opened, and the air inlet area for the oil fume to pass through can be reduced to 60% - 80% of the original. Correspondingly, the local pressure wind speed of the first part 41 increases, the air volume becomes larger, the pressure becomes larger, and the oil fume suction effect is significantly improved. In addition, for the selection of the distance between the highest position of the filter screen 4 and the volute 33, if L2 is too large, the second part 42 of the filter screen 4 is too close to the volute 33, and the pressure at the rear side of the volute 33 is too large, which will affect the impeller speed of the fan system 3.

[0038] A drip nozzle 34 is provided at the bottom of the volute 33. The drip nozzle 34 is used to discharge the oil liquid in the volute 33 downward. The horizontal distance between the drip nozzle 34 and the rear side wall of the fan frame 2 is D2, and the horizontal distance between the junction of the first part 41 and the second part 42 of the filter screen 4 (the highest position of the filter screen 4) and the rear side wall of the fan frame 2 is D1, and D1 > 1.1D2 is satisfied, so as to ensure that the oil stain is guided backward after falling from the volute 33 into the second part 42 of the filter screen 4 to flow into an oil cup (not shown) or other oil collecting structures, avoiding direct downward dripping.

[0039] In addition, the first part 41 includes a net part 411 located in the middle and a closed part 412 located on the left and right sides of the net part 411, and the mesh 43 is formed in the net part 411. Since the air volume on the left and right sides is small, the pressure at the net part 411 can be increased by arranging the closed parts 412 on the left and right sides, thereby promoting the inhalation of oil smoke. The left and right width of the first part 41 is D, and the left and right width of the closed part 412 on each side is d, and 0.08≤d / D≤0.16 is satisfied.

[0040] The opening ratio of the filter screen 4 (comparison between the mesh 43 of the mesh portion 411 of the first part 41 and the entire mesh) is 50% to 60% to ensure sufficient air intake area, air volume and efficiency.

[0041] 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 fume hood (1), a fan frame (2) arranged on the fume hood (1), and a fan system (3) arranged in the fan frame (2), the fume hood (1) comprising an air inlet (14), a filter (4) being arranged at the air inlet (14), and the fan system (3) comprising a first suction port (31) facing forward; characterized in that: The filter screen (4) comprises an integrated first part (41) and a second part (42), the first part (41) gradually tilts upward from front to back, and the second part (42) gradually tilts downward from the rear end of the first part (41), the filter screen (4) further comprises mesh holes (43), at least the first part (41) has the mesh holes (43), the front-to-back length of the projection of the first part (41) on the horizontal plane is d1, the front-to-back length of the projection of the second part (42) on the horizontal plane is d2, and d1>d2 is satisfied.

2. The range hood according to claim 1, characterized in that: d1 and d2 satisfy the following relationship:

3. The range hood according to claim 1 or 2, characterized in that: The smoke collecting hood (1) comprises an inner hood (11), the inner hood (11) being in a shape that tilts upward from the periphery to the middle to form an upwardly concave smoke collecting cavity (111), and the air inlet (14) is formed in the middle of the inner hood (11).

4. The range hood according to claim 3, characterized in that: The first part (41) has an inclination angle α with the horizontal plane, and the line between the front end of the inner cover (11) of the smoke hood (1) and the front end of the first part (41) has an inclination angle β with the horizontal plane, and α=β is satisfied.

5. The range hood according to claim 1 or 2, characterized in that: The second part (42) also has the mesh (43), and the opening rate of the filter (4) is 70% to 85%.

6. The range hood according to claim 5, characterized in that: The fan system (3) comprises a volute (33) and an impeller (35) arranged in the volute (33); the vertical distance between the bottom of the volute (33) and the horizontal plane where the lowest position of the filter screen (4) is located is L1; the vertical distance between the highest position of the filter screen (4) and the horizontal plane where the lowest position of the filter screen (4) is located is L2; ​​the highest position of the filter screen (4) is the junction of the first part (41) and the second part (42), and 0.5L1 is satisfied. <L2<0.8L1。 7. The range hood according to claim 1 or 2, characterized in that: The mesh (43) is formed only in the first portion (41), and the opening rate of the filter (4) is 50% to 60%.

8. The range hood according to claim 7, characterized in that: The fan system (3) comprises a volute (33), an impeller (35) arranged in the volute (33), and an oil drip nozzle (34) arranged at the bottom of the volute (33); the horizontal distance between the oil drip nozzle (34) and the rear side wall of the fan frame (2) is D2; the horizontal distance between the highest position of the filter screen (4) and the rear side wall of the fan frame (2) is D1; ​​the highest position of the filter screen (4) is the junction of the first part (41) and the second part (42), and D1>1.1D2 is satisfied.

9. The range hood according to claim 7, characterized in that: The fan system (3) comprises a volute (33) and an impeller (35) arranged in the volute (33); the vertical distance between the bottom of the volute (33) and the horizontal plane where the lowest position of the filter screen (4) is located is L1; the vertical distance between the highest position of the filter screen (4) and the horizontal plane where the lowest position of the filter screen (4) is located is L2; ​​the highest position of the filter screen (4) is the junction of the first part (41) and the second part (42), and 0.5L1 is satisfied. <L2<0.8L1。 10. The range hood according to claim 7, characterized in that: The first part (41) comprises a net part (411) and closed parts (412) located on the left and right sides of the net part (411), and the mesh holes (43) are only formed in the net part (411).

11. The range hood according to claim 10, characterized in that: The left-right width of the first portion (41) is D, the left-right width of the closed portion (412) on each side is d, and 0.08≤d / D≤0.16 is satisfied.

12. The range hood according to claim 1 or 2, characterized in that: The fan system (3) further comprises a second suction port (32) facing backwards, wherein the first suction port (31) is a main suction port and the second suction port (32) is a secondary suction port.

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