Range hood

Abstract

The utility model discloses a range hood which comprises a shell and a ventilation assembly arranged on the shell, the ventilation assembly comprises a first ventilation part and a second ventilation part which can relatively lift, the first ventilation part is provided with a first ventilation hole, and the second ventilation part is provided with a second ventilation hole; the first ventilation hole of the first ventilation component is at least partially shielded by the second ventilation component, and the shielding proportion is x; the ventilation assembly at least can be in the following states that the first state is that the average distance between the first ventilation component and the second ventilation component is # imgabs 0 #, the second state is that the ventilation assembly is in the maximum air volume state, the average distance between the first ventilation component and the second ventilation component is # imgabs 1 #, # imgabs 2 #, # imgabs 3 # and the shielding ratio x meet the following relation that when the value range of x is [30%, the value range of x is greater than 0%, the value range of x is greater than 0%, and the value range of x is greater than 0%. When the value range of x is (50%, 70%), when the value range of x is (70%, 100%), and when the value range of x is (50%, 70%), the value range of x is (70%, 100%), the value range of x is (6%, 6%), and the value range of x is (50%, 70%), the value range of x is (50%, 70%), and the value range of x is (70%, 100%).

Description

Technical Field

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

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

[0003] Traditional top - mounted range hoods usually adopt a double - layer filter screen to meet the oil path requirements. As a result, the distance between the double - layer filter screens is too small during operation, leading to a large air inlet resistance and unable to meet the air inlet requirements. The applicant has made improvements in this regard. For example, Chinese Patent No. 202321372669.4 discloses a lifting range hood, which includes a fan frame. An oil fume suction fan is installed inside the fan frame, an outer box body is installed outside the fan frame, a smoke collecting hood is installed at the bottom of the outer box body, and an air inlet is opened on the smoke collecting hood. The outer box body can move up and down relative to the fan frame under the drive of a driving mechanism. A first plate body is installed at the bottom of the fan frame, and a second plate body is installed at the air inlet. When the outer box body is in the raised state, the first plate body and the second plate body overlap to close the air inlet. When the outer box body is in the lowered state, an air inlet channel is formed between the first plate body and the second plate body.

[0004] The above - mentioned range hood can better meet the requirements of the oil path and air inlet. However, it cannot accurately control the lifting stroke of the outer box body. If the outer box body continues to descend when the air inlet requirements are already met, it will cause waste of the stroke, bring about redundant movement stroke of the lifting mechanism, and thus cause instability after long - term use of the lifting mechanism. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a range hood that can reasonably control the lifting stroke of the range hood in view of the deficiencies of the above - mentioned existing technologies.

[0006] The technical solution adopted by the utility model to solve the above - mentioned technical problem is: a range hood, including a housing and a ventilation component arranged on the housing. The ventilation component includes a first ventilation part and a second ventilation part that can move up and down relative to each other. In the oil fume flow path, the second ventilation part is arranged downstream of the first ventilation part. The first ventilation part has a first ventilation hole, and the second ventilation part has a second ventilation hole; characterized in that:

[0007] At least part of the first ventilation hole of the first ventilation part is blocked by the second ventilation part, and the blocking ratio is x;

[0008] The ventilation component can be at least in the following states:

[0009] The first state, the average distance between the first ventilation component and the second ventilation component is

[0010] The second state, which is the maximum air volume state, the average distance between the first ventilation component and the second ventilation component is And

[0011] The above and the occlusion ratio x satisfy the following relationship:

[0012] When the value range of x is [30%, 50%], When the value range of x is (50%, 70%], When the value range of x is (70%, 100%],

[0013] During the process of the second ventilation component separating from the first ventilation component from being close to each other, the ventilation resistance decreases and the air volume gradually increases. However, when the separation distance reaches a certain distance, the maximum air volume will be reached. At this time, increasing the distance between the second ventilation component and the first ventilation component will no longer increase the air volume, but instead consume the lifespan of the moving mechanism or make the smoke collecting hood too low, affecting the cooking experience. Therefore, in this solution, for ventilation components with different occlusion ratios, the minimum distance that can reach the maximum air volume is set, that is, the minimum downward stroke to reach the maximum air volume is limited. Thus, the moving mechanism used to drive the lifting of the ventilation component can meet the maximum air intake demand without unnecessary movement, avoiding wear and other problems caused by unnecessary movement of the moving mechanism and extending the service life of the moving mechanism; in addition, it can also avoid the problem of insufficient air volume caused by too small a downward stroke, resulting in an unsatisfactory oil fume extraction effect.

[0014] According to one aspect of the present invention, the first ventilation component and the second ventilation component are parallel perforated flat plates, and the distance between any positions of the first ventilation component and the second ventilation component is equal to the average distance.

[0015] According to another aspect of the present invention, the first ventilation component and the second ventilation component are perforated flat plates, the second ventilation component is inclined relative to the first ventilation component, the maximum distance between the first ventilation component and the second ventilation component is h max , the minimum distance between the first ventilation component and the second ventilation component is h min ,

[0016] According to another aspect of the present utility model, the first ventilation component is an open-pored flat plate component, the second ventilation component is of an irregular shape. The first ventilation component is divided into n×m grids, and the distance hij from the intersection point of the measured grid to the second ventilation component is obtained. n represents the number of rows, i represents the number of any row, m represents the number of columns, j represents the number of any column, and the length and width of a single grid are both 25 mm to 35 mm. Preferably, the housing includes a first housing, a second housing, and a smoke collecting hood provided at the bottom of the first housing. A smoking port is formed on the smoke collecting hood. The first housing at least partially wraps around the outer periphery of the second housing and is at least partially located below the second housing. The first housing can move up and down relative to the second housing. The first ventilation component is provided at the smoking port, and the second ventilation component is provided on the second housing. Thus, by setting the lifting of the first housing, the negative pressure area of the range hood can be lowered to a position close to the smoke source. At the same time, the lifting of the first housing can be used to achieve the lifting of the first ventilation component, so that there is no need to provide a separate motion mechanism for the first ventilation component, simplifying the overall structure of the machine.

[0017] Furthermore, the second ventilation component is connected to the bottom of the second housing, which can facilitate the second ventilation component to receive the oil flowing down from the wall surface of the second housing and prevent the oil from dripping through the first ventilation component when the first ventilation component and the second ventilation component are separated.

[0018] Furthermore, the first ventilation component includes a first ventilation component body, the second ventilation component includes a second ventilation component body. The second ventilation component body is located above the first ventilation component body. Both the first ventilation component body and the second ventilation component body are gradually inclined downward from front to back. This can guide the oil received by the second ventilation component and the first ventilation component backward, so that the oil can be collected by providing one oil cup.

[0019] Furthermore, the second ventilation component includes a second ventilation component body, and the second ventilation component body is gradually inclined downward from front to back. This can guide the oil received by the second ventilation component backward and prevent it from dripping through the first ventilation component.

[0020] Compared with the prior art, the advantages of the present utility model are as follows: during the process of the second ventilation component approaching and then separating from the first ventilation component, the ventilation resistance decreases and the air volume gradually increases. When the separation distance reaches a certain value, the maximum air volume will be achieved. At this time, increasing the distance between the second ventilation component and the first ventilation component will not increase the ventilation volume anymore, but will instead reduce the service life of the motion mechanism or cause the smoke collecting hood to be too low, thus affecting the cooking experience. Therefore, for ventilation components with different occlusion ratios in this solution, the minimum distance at which the maximum air volume can be achieved is set, that is, the minimum downward stroke at which the maximum air volume is reached is defined. As a result, the motion mechanism used to drive the lifting of the ventilation component can meet the maximum air intake requirement without unnecessary movement, avoiding wear and other problems caused by the unnecessary movement of the motion mechanism and extending the service life of the motion mechanism. In addition, it can also avoid the problem of insufficient air volume caused by too small a downward stroke, thereby resulting in an unsatisfactory oil fume suction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the range hood according to an embodiment of the present utility model (first state);

[0022] Figure 2 Exploded structural schematic diagram of the range hood according to an embodiment of the present utility model;

[0023] Figure 3 Cross-sectional view of the range hood according to an embodiment of the present utility model (first state, front-to-back cross-section);

[0024] Figure 4 is Figure 3 Partial enlarged schematic diagram of I;

[0025] Figure 5 Cross-sectional view of the range hood according to an embodiment of the present utility model (initial state, left-to-right cross-section);

[0026] Figure 6 Cross-sectional view of the second housing, motion mechanism and second ventilation component of the range hood according to an embodiment of the present utility model (left-to-right cross-section);

[0027] Figure 7 is Figure 6 Partial enlarged schematic diagram of II;

[0028] Figure 8 Schematic diagram of the range hood according to an embodiment of the present utility model (second state);

[0029] Figure 9 Cross-sectional view of the range hood according to an embodiment of the present utility model (second state, front-to-back cross-section);

[0030] Figure 10-1 Schematic diagram of the distance between two ventilation components when they are parallel;

[0031] Figure 10-2 Schematic diagram of the distance between two ventilation components when they are relatively inclined;

[0032] Figure 10-3 Schematic diagram of the distance between two irregular ventilation components. Detailed implementation manner

[0033] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0034] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It 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 disclosed embodiments of the present utility model can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0035] Refer to Figures 1 to 9 , an oil fume extractor, which is a top suction type oil fume extractor, including a housing. The housing includes a first housing 11 and a second housing 12. The first housing 11 at least partially covers the outer periphery of the second housing 12, and the first housing 11 is at least partially located below the second housing 12. The second housing 12 can be fixed to an external installation base, such as a wall, while the first housing 11 can move up and down relative to the second housing 12. Both the first housing 11 and the second housing 12 are hollow structures and are in fluid communication with each other, and preferably, their horizontal cross-sections can both be rectangular.

[0036] The housing further includes a smoke collecting hood 6 provided at the bottom of the first housing 11. A smoke collecting cavity 61 that rises upward from the bottom surface is formed in the smoke collecting hood 6. A smoke suction port 62 is formed at the top of the smoke collecting hood 6 where the smoke collecting cavity 61 is located. By forming the upwardly rising smoke collecting cavity 61, the function of collecting smoke can be achieved, preventing the oil fume from escaping when it contacts the smoke collecting hood 6. Moreover, since it rises upward and avoids being exposed at the bottom of the smoke collecting hood 6, it can better realize the concealment of the lifting range hood.

[0037] The range hood further includes a fan system 2 and a ventilation component. The fan system 2 is at least partially disposed within the second housing 12. In this embodiment, the fan system 2 is a centrifugal fan. The ventilation component includes a first ventilation member 31 and a second ventilation member 32. The first ventilation member 31 is disposed at the smoke suction port 62, while the second ventilation member 32 is disposed at the bottom of the second housing 12 and is connected to the bottom of the second housing 12 so as to receive the oil flowing down from the inner side wall surface of the second housing 12 and the fan system 2. The second ventilation member 32 and the second housing 12 may be directly connected or indirectly connected, and may be connected inside the second housing 12 or outside the second housing 12. To ensure that the second ventilation member 32 can receive the oil flowing down from the inner side wall surface of the second housing 12, when the connection position is inside the second housing 12, the second ventilation member 32 or an additional connecting member contacts the inner side wall surface of the second housing 12; when the connection position is outside the second housing 12, in the horizontal plane projection, the second ventilation member 32 or an additional connecting member at least partially covers the bottom edge of the second housing 12. In this embodiment, the front and rear sides of the second ventilation member 32 are connected to the inside of the second housing 12, while the left and right sides are connected to the lower side of the second housing 12. Refer to Figure 4 , the connection part on the front side of the second ventilation member 32 is located at the rear side of the front side wall surface of the second housing 12, and the two can be fixed by screws extending in the front and rear directions. Refer to Figure 6 and Figure 7 , the connection part on the right side of the second ventilation member 32 is located below the right side wall surface of the second housing 12 (flanges can be formed here respectively), and the two can be fixed by screws extending in the up and down directions.

[0038] An oil cup 4 is provided at the rear side of the bottom of the first housing 11 to collect the oil flowing down from the inner wall of the housing, the ventilation component, the fan system 2, etc.

[0039] The first ventilation component 31 includes a first ventilation component body 311 and first ventilation holes 312 formed in the first ventilation component body 311. In this embodiment, the first ventilation component body 311 is substantially in the shape of a flat plate, and the first ventilation holes 312 are elongated mesh holes and extend in the front-rear direction, so that the first ventilation component 31 is configured as a grille. The second ventilation component 32 includes a second ventilation component body 321 and second ventilation holes 322 formed in the second ventilation component body 321. The second ventilation component body 321 is correspondingly located above the first ventilation component body 311 and below the second housing 12. The second ventilation holes 322 are also elongated mesh holes and extend in the front-rear direction, and are also a grille. Both the first ventilation component body 311 and the second ventilation component body 321 are gradually inclined downward from front to back so that the collected oil flows into the oil cup 4. To avoid oil dripping, the first ventilation holes 312 and the second ventilation holes 322 are arranged in an alternating manner, that is, the first ventilation holes 312 correspond to the solid part between two adjacent second ventilation holes 322, and the second ventilation holes 322 correspond to the solid part between two adjacent second ventilation holes 322.

[0040] Thus, at least a part of the first ventilation holes 312 of the first ventilation component 31 is blocked by the second ventilation component 32 (that is, in the horizontal plane projection, the first ventilation holes 312 overlap with the part of the second ventilation component 32 where the second ventilation holes 322 are not formed), and the blocking ratio is x. Specifically, the calculation method is that in the horizontal plane projection, the total area blocked by the second ventilation component 32 of the first ventilation holes 312 / the total area of the first ventilation holes 312; the value range of x is 30% to 100%. The lifting of the first housing 11 can meet the requirements of gathering smoke during work and hiding when not working. Moreover, through the above structure, the change in the distance between the first ventilation component 31 and the second ventilation component 32 can be achieved without separately setting a motion mechanism, simplifying the structure and reducing the cost.

[0041] Thus, the range hood can be at least in the following several states. Initial state (first state): Refer to Figure 1 and Figure 3 , the first housing 11 rises to the highest position. At this time, the first ventilation component 31 and the second ventilation component 32 are in a close state, and the average distance between the first ventilation component 31 and the second ventilation component 32 is not greater than 8 mm

[0042] When the range hood is turned on, the first housing 11 descends relative to the second housing 12, and the distance between the first ventilation component 31 and the second ventilation component 32 gradually increases and separates, and the air intake resistance decreases. The air volume passing through the first ventilation component 31 will gradually increase until the first housing 11 descends to the required position. At this time, it is recorded as the second state. Refer to Figure 8 and Figure 9, at this time, the average distance between the first ventilation component 31 and the second ventilation component 32 is At this time, set the blower system to the second gear at maximum. The air volume passing through the first ventilation component 31 (which is also the maximum air volume of the whole machine) reaches the maximum air volume, that is, the nominal air volume of the range hood. This nominal air volume is the maximum air volume recorded in the product manual of the range hood. After that, if the first housing 11 continues to descend to a certain position, the average distance between the first ventilation component 31 and the second ventilation component 32 will be greater than At this time, the air volume passing through the first ventilation component 31 will no longer increase.

[0043] That is to say, during the operation of the range hood, when the first ventilation component 31 descends to a certain height relative to the second ventilation component 32, the maximum air volume will be reached. After that, even if the first ventilation component 31 continues to descend, the maximum air volume passing through the first ventilation component 31 will no longer continue to increase. Thus, find the above-mentioned h 2 , so that when the range hood is working, the two ventilation components are lifted and lowered to reach the minimum distance to obtain the maximum air volume. After that, continuing to increase the distance will not increase the ventilation volume anymore, but will instead consume the lifespan of the moving mechanism or make the smoke collecting hood too low, affecting the cooking experience. Therefore, in this solution, for the ventilation components of the first ventilation component with different effective ventilation areas, a minimum descent stroke that can reach the maximum air volume is set, so that the moving mechanism used to drive the lifting of the ventilation components can meet the maximum air intake demand without redundant movement, avoiding wear and other problems caused by redundant movement of the moving mechanism and extending the service life of the moving mechanism; in addition, it can also avoid the problem of insufficient air volume caused by too small a descent stroke, resulting in an unsatisfactory smoke extraction effect.

[0044] For the above-mentioned average distance, there are different calculation methods for ventilation components arranged in different ways. See Figure 10-1 , when the first ventilation component 31 and the second ventilation component 32 are parallel perforated flat plates, the distance h between any positions of the first ventilation component 31 and the second ventilation component 32 is equal to the average distance. See again Figure 10-2 , when the second ventilation component 32 is inclined relative to the first ventilation component 31, and both the first ventilation component 31 and the second ventilation component 32 are perforated flat plates, then the maximum distance between the two is h max (the vertical distance between the upper surface of the front end of the first ventilation component 31 shown in the figure and the lower surface of the second ventilation component 32), the minimum distance is h min (

[0045] the vertical distance between the upper surface of the rear end of the first ventilation component 31 shown in the figure and the lower surface of the second ventilation component 32), See Figure 10-3, when the second ventilation component 32 is of an irregular shape (the first ventilation component 31 remains an open-hole flat part), at this time, the first ventilation component 31 is divided into n×m grids, and the distance h at the intersection points of the grids is measured ij (the vertical distance between the upper surface at the grid intersection points of the first ventilation component 31 shown in the figure and the lower surface of the second ventilation component 32) n represents the number of rows, i represents the number of any row, m represents the number of columns, j represents the number of any column. Here, the grids are divided based on the area (usually a rectangle) enclosed by the outer contour of the first ventilation component 31, and the length and width of a single grid are both 25mm - 35mm. Preferably, the length and width are both 30mm. In this embodiment, the first ventilation component 31 can be divided into 20×20 grids.

[0046] The average spacing in the above second state It has the following relationship with the above-mentioned occlusion ratio x: when the value range of x is [30%, 50%], when the value range of x is (50%, 70%], when the value range of x is (70%, 100%],

[0047] Referring to Table 1, it shows the corresponding

[0048] Occlusion rate 30％ 68％ 80％ 100％ Average spacing (mm) 8-12 35-45 50-60 65-75

[0049] Table 1: Relationship between different occlusion ratios and average spacing

[0050] It can be seen that the larger the occlusion ratio, the larger the required spacing, that is, the greater the descending stroke of the first ventilation component 31.

[0051] Referring to Table 2 again, it shows the relationship between the first ventilation component at different descending heights and the maximum air volume:

[0052]

[0053] Table 2: Relationship between the first ventilation component at different descending heights and the maximum air volume

[0054] It can be seen that when the occlusion ratio is certain, the greater the descending height of the first ventilation component 31, that is, the greater the average spacing between the two ventilation components, the greater the maximum air volume passing through the first ventilation component 31.

[0055] In the tests for obtaining the above Tables 1 and 2, the air volume is obtained by detecting the wind speed. The wind speed measurement points can be evenly distributed along the left - right direction of the first ventilation component 31, with a measurement point spacing of 30 mm. The wind speed measurement points are also arranged to be evenly distributed along the front - back direction of the first ventilation component 31, with a measurement point spacing of 30 mm. Then, the average value of the wind speeds measured at all measurement points is taken. Then the air volume where S is the total ventilation area of all the first ventilation holes 312 of the first ventilation component 31.

[0056] In this embodiment, the second ventilation component 32 is of an irregular shape. Preferably, The value range of is 25 - 45 mm.

[0057] Ventilation component body Ventilation component body Ventilation component body Ventilation component body Ventilation component body Ventilation component body

[0058] In the above - mentioned embodiment, taking the descent of the first ventilation component 31 as an example, alternatively, the separation of the first ventilation component 31 and the second ventilation component 32 can also be achieved by the ascent of the second ventilation component 32. In addition, both the first ventilation component 31 and the second ventilation component 32 are filter meshes in this embodiment. Alternatively, they can also be formed by perforating a plate member, as disclosed in the prior application of the applicant mentioned in the background art.

[0059] What is referred to as "fluid communication" in the present utility model refers to the spatial position relationship between two components or parts (hereinafter uniformly referred to as the first part and the second part respectively), that is, a fluid (gas, liquid or a mixture of both) can flow along a flow path from the first part and / or be transported to the second part. It can be that the first part and the second part are directly connected, or the first part and the second part are indirectly connected through at least one third party. The third party can be a fluid passage such as a pipe, a channel, a conduit, a flow - guiding member, a hole, a groove, etc., or a chamber allowing the fluid to flow through or a combination of the above.

Claims

1. A range hood, comprising a housing and a ventilation assembly arranged on the housing, the ventilation assembly comprising a first ventilation component (31) and a second ventilation component (32) which can be lifted and lowered relative to each other, the second ventilation component (32) being arranged downstream of the first ventilation component (31) on a fume flow path, the first ventilation component (31) having a first ventilation hole (312), and the second ventilation component (32) having a second ventilation hole (322); characterized in that: The first ventilation hole (312) of the first ventilation component (31) is at least partially blocked by the second ventilation component (32), and the blocking ratio is x; The ventilation assembly can be in at least the following states: In the first state, the average distance between the first ventilation component (31) and the second ventilation component (32) is The second state is the maximum air volume state, and the average distance between the first ventilation component (31) and the second ventilation component (32) is and Above And the occlusion ratio x satisfies the following relationship: When the value range of x is [30%, 50%], When the value range of x is (50%, 70%], When the value range of x is (70%, 100%], 2. The range hood according to claim 1, characterized in that: The first ventilation component (31) and the second ventilation component (32) are parallel to each other and have holes on the flat plate. The distance between any positions of the first ventilation component (31) and the second ventilation component (32) is equal to the average distance.

3. The range hood according to claim 1, characterized in that: The first ventilation component (31) and the second ventilation component (32) are open-hole flat plate components, the second ventilation component (32) is inclined relative to the first ventilation component (31), and the maximum distance between the first ventilation component (31) and the second ventilation component (32) is h max , the minimum distance between the first ventilation component (31) and the second ventilation component (32) is h min , 4. The range hood according to claim 1, characterized in that: The first ventilation component (31) is a perforated flat plate, the second ventilation component (32) is an irregular shape, the first ventilation component (31) is divided into n×m grids, and the distance h from the intersection point of the grid to the second ventilation component (32) is measured. ij ,get n represents the number of rows, i represents the number of any row, m represents the number of columns, j represents the number of any column, and the length and width of a single grid are both 25 mm to 35 mm.

5. The range hood according to any one of claims 1 to 4, characterized in that: The shell comprises a first shell (11), a second shell (12) and a smoke collecting hood (6) arranged at the bottom of the first shell (11); a smoke outlet (62) is formed on the smoke collecting hood (6); the first shell (11) at least partially covers the outer periphery of the second shell (12) and is at least partially located below the second shell (12); the first shell (11) can move up and down relative to the second shell (12); the first ventilation component (31) is arranged at the smoke outlet (62); and the second ventilation component (32) is arranged on the second shell (12).

6. The range hood according to claim 5, characterized in that: The second ventilation member (32) is connected to the bottom of the second housing (12).

7. The range hood according to claim 1, characterized in that: The first ventilation component (31) comprises a first ventilation component body (311), the second ventilation component (32) comprises a second ventilation component body (321), the second ventilation component body (321) is located above the first ventilation component body (311), and both the first ventilation component body (311) and the second ventilation component body (321) are gradually inclined downward from front to back.

8. The range hood according to claim 1, characterized in that: The second ventilation component (32) comprises a second ventilation component body (321), and the second ventilation component body (321) gradually tilts downward from front to back.

Images