Protective net for range hood, oil net assembly and range hood

Abstract

The utility model provides a range hood protective net, oil screen subassembly and range hood, the protective net includes open pore area, first closed area and second closed area, the center of first closed area coincides with the center of protective net, open pore area is provided at the periphery of first closed area, and the second closed area is provided at the periphery of open pore area. The second closed area is located on the upper portion of the protective net and located above the hole opening area, so that the protective net forms a net structure with a hole avoiding area, airflow at an air inlet of the draught fan is rectified, and the efficiency of the draught fan is improved. The oil net assembly comprises a protective net and an oil net arranged in front of the protective net, the oil net comprises a left air inlet area, a right air inlet area and a middle air inlet area, a third closed area is arranged between the left air inlet area and the middle air inlet area, and a fourth closed area is arranged between the right air inlet area and the middle air inlet area, so that the oil net forms a net structure with a hole avoiding area; the flow speed of the left air inlet area and the right air inlet area is increased, the air speed is evenly distributed in the left-right direction of the range hood, and then the oil smoke suction effect of the range hood is improved.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to a protective net, an oil net assembly, and a range hood for use in range hoods. Background Technology

[0002] The range hood industry continues to introduce ultra-thin designs, such as those with open air inlets. In these models, fumes pass through the grease filter and directly enter the fan inlet, requiring air intake from all sides. Due to dimensional limitations (thickness b≤200mm, smoke collection chamber height h≤420mm), thinner fan designs and increased radial diameters are typically used to meet airflow and noise requirements (fan inlet diameter≥300mm). However, enlarged fan inlets often result in lower airflow velocity and reduced fume extraction efficiency. Figure 1 As shown, the upper part of the fan inlet is throttled by the front cover of the range hood, creating a corresponding vortex zone behind the front cover and a corresponding dead flow zone D below, which deteriorates the flow state of the inlet and generates vortex noise; as Figure 2 As shown, at the air inlet of the range hood, the negative pressure and the air velocity at the air inlet are unevenly distributed along the left and right directions of the range hood. The negative pressure distribution range is small on the left and right sides of the range hood, while the negative pressure distribution range is large on the lower middle side. This forms a low wind speed zone M on the left and right sides of the air inlet and a high wind speed zone N on the lower middle side, which further reduces the smoke extraction efficiency.

[0003] Currently, the main technical means to improve the fume extraction effect include the following:

[0004] The oil filter at the fan inlet is densified to increase the inlet air velocity and thus improve the oil fume extraction effect; however, densifying the oil filter is equivalent to applying an intake throttling effect to the fan, so the energy consumption required for the same air volume will inevitably increase, and the operating noise will also increase by 0.4~0.7dB, and abnormal aerodynamic noise is likely to occur.

[0005] Optimize the design of the baffle plate at the air inlet of the range hood to increase the negative pressure zone at the air inlet, thereby increasing the smoke collection area and improving the smoke extraction effect. For example, the negative pressure zone at the air inlet can be expanded by increasing the size and angle of the flap. However, this method needs to meet the appearance design requirements, and the space for optimization is limited. Usually, it is necessary to improve the smoke extraction effect in conjunction with increasing the air volume, which is more complicated to achieve.

[0006] Increasing the fan speed can improve the effective airflow and thus enhance the fume extraction effect. However, while this method improves the effect, it also increases energy consumption and noise. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the defects of existing range hoods, such as the deterioration of the airflow state at the air inlet and the poor smoke extraction effect after the range hood is made thinner, and to provide a protective net, oil net assembly and range hood for range hoods.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution:

[0009] This utility model provides a protective net for a range hood. The protective net is installed at the air inlet of the fan. The protective net includes an open area, a first closed area, and a second closed area. The center of the first closed area coincides with the center of the protective net. The open area is located on the outer periphery of the first closed area. The second closed area is located on the upper part of the protective net and above the open area.

[0010] In this design, the second enclosed area is located on the upper part of the protective net, corresponding to the rear of the front cover of the range hood. This creates a perforated area on the protective net corresponding to the front cover of the range hood, where no airflow passes through, eliminating eddies generated at that location. The center of the first enclosed area coincides with the center of the protective net. The perforated area is located on the outer periphery of the first enclosed area, i.e., the first enclosed area is located at the center of the protective net, making this area also a perforated area. This diverts the airflow to the perforated area, not only eliminating or reducing the original dead flow zone but also increasing the wind speed at the air inlet, improving fan efficiency, and reducing the noise of the range hood. The arrangement of the first enclosed area, the second enclosed area, and the perforated area creates a mesh structure with perforated areas on the protective net. This not only protects the fan inlet from accidental impeller contact but also rectifies the airflow at the fan inlet, improving fan efficiency.

[0011] Preferably, the protective net is disc-shaped and includes an outer frame, a central plate, and a concave curved surface connecting the outer frame and the central plate, wherein the first enclosed area is located on the central plate.

[0012] In this design, the protective net is disc-shaped to match the circular fan inlet. The protective net includes an outer frame, a central flat plate, and a concave curved surface. The outer frame connects the protective net to the fan inlet, and the central flat plate disperses the airflow onto the concave curved surface. The concave curved surface between the outer frame and the central flat plate guides the airflow entering the protective net from the outer frame and also transitions the airflow from the first enclosed area to the periphery of the first enclosed area, thereby guiding it to the opening area and into the fan interior, reducing airflow disturbance.

[0013] Preferably, the first enclosed area is a circular area centered on the center of the protective net, and the radius of the first enclosed area is smaller than the radius of the protective net.

[0014] In this scheme, the first closed area is set as a circle, and the radius of the closed area is smaller than the radius of the protective net. That is, the area of ​​the first closed area is controlled to ensure the area of ​​the opening area, thereby ensuring the opening rate of the protective net and thus ensuring the air intake.

[0015] Preferably, the second closed area is an arc-shaped region formed with the upper end of the protective net as its apex, and the height of the arc-shaped region is less than the radius of the protective net.

[0016] In this design, the second enclosed area is set as an arc-shaped area with a height less than the radius of the protective net. That is, the second enclosed area is controlled above the protective net, so that the second enclosed area corresponds to the front cover of the range hood to eliminate eddies and ensure that the air inlet has sufficient air volume.

[0017] This utility model also provides an oil mesh assembly, which includes an oil mesh and a protective mesh as described above. The oil mesh is disposed in front of the protective mesh. The oil mesh includes a left air inlet area and a right air inlet area, as well as a middle air inlet area located between the left air inlet area and the right air inlet area. A third closed area is provided between the left air inlet area and the middle air inlet area, and a fourth closed area is provided between the right air inlet area and the middle air inlet area.

[0018] In this solution, the oil mesh assembly provided by this utility model includes a protective net as described above and an oil mesh disposed in front of the protective net to filter oil fumes. The oil mesh includes a left air intake area, a right air intake area, and a middle air intake area located between the left and right air intake areas. A third closed area is provided between the left air intake area and the middle air intake area, and a fourth closed area is provided between the right air intake area and the middle air intake area, so that the oil mesh forms a mesh structure with a perforated area. The third and fourth closed areas are provided on both sides of the middle air intake area to reduce the air intake volume on both sides of the middle air intake area, reduce the negative pressure at this position, and guide the airflow to the left and right air intake areas respectively, thereby increasing the flow velocity in the left and right air intake areas and making the wind speed distribution uniform along the left and right direction of the range hood. This effectively improves the oil fume extraction effect of open-air range hoods in different cooking scenarios, such as the consistent oil fume extraction effect on the left and right sides of a dual-burner range hood.

[0019] Preferably, the oil mesh covers the opening area and the first closed area of ​​the protective mesh.

[0020] In this solution, the oil mesh covers the open area and the first closed area of ​​the protective mesh, so that the airflow filtered by the oil mesh can enter the fan after passing through the protective mesh. The first closed area guides the airflow to the open area, which not only eliminates the original flow dead zone, but also increases the wind speed at the air inlet and improves the efficiency of the fan.

[0021] Preferably, the left air intake zone and the right air intake zone are symmetrically arranged on both sides of the oil screen, and air intake mesh holes are provided on the left air intake zone, the middle air intake zone and the right air intake zone.

[0022] In this design, the left and right air intake zones are symmetrically arranged on both sides of the oil mesh, so that both sides of the oil mesh can filter oil fumes. The symmetrical arrangement makes the oil mesh structure more aesthetically pleasing.

[0023] Preferably, the third and fourth enclosed areas are rectangular regions without openings, symmetrically arranged between the left and right air inlet areas.

[0024] In this design, the third and fourth enclosed areas are rectangular regions without openings, forming a rectangular perforation area on each side of the left and right air intake areas. This guides the airflow from both sides of the middle air intake area to the left and right air intake areas, increasing the flow velocity in these areas and thus improving the smoke extraction effect on both sides of the range hood. The symmetrical rectangular areas not only simplify the production of the oil mesh but also make its structure more aesthetically pleasing.

[0025] Preferably, the center point of the oil net is located to the left of the center point of the protective net.

[0026] In this solution, the original wind speed distribution on the left and right sides of the fan was uneven, with the wind speed on the left side being higher than that on the right side. By placing the center point of the oil mesh to the left of the center point of the protective mesh, the opening area on the left side of the fan inlet is larger than that on the right side, which reduces the original wind speed on the left side of the fan. This balances the wind speeds on the left and right sides of the fan, making the wind speeds on the left and right sides of the fan approximately equal, thus reducing the aerodynamic noise caused by the unequal wind speeds on the left and right sides of the fan.

[0027] This utility model also provides a range hood, which includes a front cover and an oil filter assembly as described above, wherein the front cover is located in front of the second enclosed area and covers the second enclosed area.

[0028] The positive and progressive effects of this utility model are as follows: This utility model provides a protective net, an oil net assembly, and a range hood for a range hood. The protective net is installed at the air inlet of the fan. The protective net includes an open area, a first closed area, and a second closed area. The center of the first closed area coincides with the center of the protective net. The open area is located on the outer periphery of the first closed area. The second closed area is located on the upper part of the protective net and above the open area. The protective mesh, with its first enclosed zone, second enclosed zone, and perforated zone, forms a mesh structure with perforated areas. This not only protects the fan inlet from accidental impeller contact but also rectifies the airflow at the fan inlet, improving fan efficiency. The oil mesh includes a left air inlet zone, a right air inlet zone, and a middle air inlet zone between them. A third enclosed zone is located between the left and middle air inlet zones, and a fourth enclosed zone is located between the right and middle air inlet zones. This creates a mesh structure with perforated areas, increasing the airflow velocity in the left and right air inlet zones and making the airflow more evenly distributed along the left and right sides of the range hood. This effectively improves the smoke extraction effect of open-inlet range hoods in different cooking scenarios. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the airflow distribution at the inlet of a wind turbine in the existing technology.

[0030] Figure 2 This is a schematic diagram of the airflow distribution at the air inlet of a range hood in the existing technology.

[0031] Figure 3 A schematic diagram of installing a protective net at the air inlet of a fan.

[0032] Figure 4 This is a schematic diagram of the structure of a protective net according to an embodiment of the present invention.

[0033] Figure 5 for Figure 4 A cross-sectional view of the protective netting.

[0034] Figure 6 A diagram showing the installation of an oil filter at the air inlet of a range hood.

[0035] Figure 7 This is a schematic diagram of the oil mesh structure.

[0036] Figure 8 This is a schematic diagram of the structure of a range hood in one direction.

[0037] Explanation of reference numerals in the attached figures

[0038] Protective net 1

[0039] Opening area 2

[0040] First Closed Zone 3

[0041] Second Enclosed Zone 4

[0042] Outer frame 5

[0043] Central plate 6

[0044] Concave surface 7

[0045] Oil Network 8

[0046] Left air intake zone 9

[0047] Right intake zone 10

[0048] Central air intake zone 11

[0049] Third Enclosure Zone 12

[0050] Fourth Enclosed Zone 13

[0051] Front cover 14

[0052] Fan inlet 15

[0053] 16mm air inlet for range hood

[0054] Oil Range Hood 17 Detailed Implementation

[0055] The present invention will be described more clearly and completely below through preferred embodiments and in conjunction with the accompanying drawings.

[0056] Example 1

[0057] like Figures 3-5As shown, this utility model provides a protective net 1 for a range hood. The protective net 1 is installed at the air inlet 15 of the fan. The protective net 1 includes an opening area 2, a first closed area 3, and a second closed area 4. The second closed area 4 is located on the upper part of the protective net 1 and corresponds to the rear of the front cover plate of the range hood. The center of the first closed area 3 coincides with the center of the protective net 1. The opening area 2 is located on the outer periphery of the first closed area 3. The second closed area 4 is located on the upper part of the protective net 1 and above the opening area 2. The second closed area 4 is located on the upper part of the protective net 1, so that the portion of the protective net 1 corresponding to the front cover plate 14 of the range hood forms a hole-avoiding area. No airflow passes through this area, eliminating the eddy current generated at this location. The center of zone 3 coincides with the center of the protective net 1, that is, the first closed zone 3 is set at the center of the protective net 1, so that this area also forms a hole-avoiding zone. The opening zone 2 is set on the outer periphery of the first closed zone 3, and the airflow of this part is diverted to the opening zone 2. This can not only reduce or eliminate the original dead flow zone, but also increase the wind speed at the air inlet, improve the efficiency of the fan, and reduce the noise of the range hood. Through the setting of the first closed zone 3, the second closed zone 4 and the opening zone 2, the protective net 1 forms a mesh structure with a hole-avoiding zone. This not only allows the protective net 1 to protect the fan air inlet 15 from accidental contact with the impeller, but also to rectify the airflow at the fan air inlet 15 and improve the efficiency of the fan.

[0058] like Figures 4-5 As shown, the protective net 1 includes an outer frame 5, a central plate 6, and a concave curved surface 7 connecting the outer frame 5 and the central plate 6. The first enclosed area 3 is located on the central plate 6. The outer frame 5 is used to connect the protective net 1 to the air inlet 15 of the fan, and the central plate 6 is used to disperse the airflow on it into the concave curved surface 7. The concave curved surface 7 between the outer frame 5 and the central plate 6 guides the airflow entering the protective net 1 from the outer frame 5, and also transitions the airflow in the first enclosed area 3 to the periphery of the first enclosed area 3, thereby guiding it to the opening area 2 and entering the fan, reducing airflow disturbance.

[0059] like Figure 4As shown, the first closed area 3 is a circle with the center of the protective net 1 as its center, and the radius of the first closed area 3 is smaller than the radius of the protective net 1; the second closed area 4 is an arc-shaped area formed with the upper end of the protective net 1 as its vertex, and the height of the arc-shaped area is smaller than the radius of the protective net 1. In this embodiment, the first closed area 3 is set as a circle, and the radius of the closed area is smaller than the radius of the protective net 1, that is, the area of ​​the first closed area 3 is controlled to ensure the area of ​​the opening area 2, thereby ensuring the opening ratio of the protective net 1 and thus ensuring the air intake volume; the second closed area 4 is set as an arc-shaped area, and the height is smaller than the radius of the protective net 1, that is, the second closed area 4 is controlled at the upper part of the protective net 1, so that the second closed area corresponds to the front cover of the range hood to eliminate eddies and ensure that the fan inlet has sufficient air intake volume. As shown in the figure, this utility model provides a specific size design for the protective net 1. The overall outer contour of the protective net 1 is disc-shaped, the radius of the protective net 1 is R2=166.5mm, and the area of ​​the protective net 1 is S1=0.1324m². 2 The second closed area 4 is arc-shaped, with no holes in the arc-shaped area. The height of the arc-shaped area H = 59 mm, and the area S2 = (0.19~0.2)S1. The first closed area 3 is circular, with an area S3 = (0.06~0.07)S1. In this embodiment, S3 = 0.067S1, and the radius R3 of the first closed area 3 = 54 mm. Of course, in other embodiments, the specific dimensions of each part of the protective net 1 can be adjusted as needed.

[0060] Although in this embodiment, the first closed area 3 is a circle centered on the protective net 1, in other embodiments, the first closed area 3 can be triangular, rhomboid, rectangular, etc., as long as the first closed area 3 can cover the dead flow zone and guide the airflow in the first closed area 3 to the opening area 2. In this embodiment, the opening area 2 of the protective net 1 refers to the area on the protective net 1 with mesh holes, and the first closed area 3 and the second closed area 4 are areas without mesh holes, that is, forming a hole-avoiding area.

[0061] Example 2

[0062] like Figures 6-7 As shown, this utility model also provides an oil mesh 8 assembly, which includes an oil mesh 8 and the aforementioned protective mesh 1. The oil mesh 8 is disposed in front of the protective mesh 1. Specifically, the oil mesh 8 is installed on the front panel of the range hood and located at the air inlet of the range hood to filter the incoming oil fumes. The oil mesh 8 covers the opening area 2 and the first closed area 3 of the protective mesh 1, so that the airflow filtered by the oil mesh 8 can pass through the protective mesh 1 and enter the fan. The first closed area 3 guides the airflow to the opening area 2, which can not only eliminate the original flow dead zone, but also increase the wind speed at the air inlet and improve the efficiency of the fan.

[0063] like Figure 7As shown, the oil mesh 8 includes a left air intake zone 9 and a right air intake zone 10, as well as a middle air intake zone 11 located between the left air intake zone 9 and the right air intake zone 10. A third closed zone 12 is provided between the left air intake zone 9 and the middle air intake zone 11, and a fourth closed zone 13 is provided between the right air intake zone 10 and the middle air intake zone 11.

[0064] The oil filter 8 assembly provided by this utility model includes a protective net 1 as described above and an oil filter 8 disposed in front of the protective net 1 to filter oil fumes. The oil filter 8 includes a left air inlet zone 9, a right air inlet zone 10, and a middle air inlet zone 11 located between the left air inlet zone 9 and the right air inlet zone 10. A third closed zone 12 is provided between the left air inlet zone 9 and the middle air inlet zone 11, and a fourth closed zone 13 is provided between the right air inlet zone 10 and the middle air inlet zone 11, so that the oil filter 8 forms a mesh structure with a perforated area. 1. A third closed zone 12 and a fourth closed zone 13 are set on both sides to reduce the air volume on both sides of the middle air intake zone 11, reduce the negative pressure at this position, and divert the airflow of this part to the left air intake zone 9 and the right air intake zone 10 respectively, thereby increasing the flow velocity of the left air intake zone 9 and the right air intake zone 10, making the wind speed distribution uniform along the left and right directions of the range hood air intake, thus effectively improving the smoke extraction effect of the open air intake range hood under different cooking scenarios, such as the consistent smoke extraction effect on the left and right sides of the range hood with dual stoves.

[0065] like Figure 7 As shown, the left air intake zone 9 and the right air intake zone 10 are symmetrically arranged on both sides of the oil mesh 8. Air intake mesh holes are provided on the left air intake zone 9, the middle air intake zone 11, and the right air intake zone 10. The symmetrical arrangement of the left air intake zone 9 and the right air intake zone 10 on both sides of the oil mesh 8 allows for filtration of oil fumes on both sides of the oil mesh 8. This symmetrical arrangement also makes the oil mesh 8 more aesthetically pleasing. The third closed zone 12 and the fourth closed zone 13 are rectangular areas without openings, symmetrically arranged between the left air intake zone 9 and the right air intake zone 10. This forms a rectangular perforation-avoiding area on each side of the left air intake zone 9 and the right air intake zone 10, guiding the airflow from both sides of the middle air intake zone 11 to the left air intake zone 9 and the right air intake zone 10, increasing the flow rate in the left air intake zone 9 and the right air intake zone 10, thereby improving the smoke extraction effect on both sides of the range hood. The symmetrical rectangular areas not only simplify the manufacture of the oil mesh 8 but also make its structure more aesthetically pleasing. In this embodiment, the third closed area 12 and the fourth closed area 13 are rectangular. Of course, in other embodiments, square, rhombus and ellipse shapes can also be selected according to actual needs.

[0066] like Figure 6As shown, during installation, the center point of the oil mesh 8 is located to the left of the center point of the protective net 1. Originally, the wind speed distribution on the left and right sides of the range hood was uneven, with the wind speed on the left being higher than on the right. By positioning the center point of the oil mesh 8 to the left of the center point of the protective net 1, the left opening area 2 of the fan inlet 15 is larger than the right opening area 2, thus reducing the wind speed on the left side of the fan. This balances the wind speeds on the left and right sides of the fan, making them approximately equal and reducing the aerodynamic noise caused by the unequal wind speeds on the left and right sides of the fan.

[0067] This embodiment provides the specific dimensional design of the oil mesh 8: the area of ​​the oil mesh 8 is S4 = 0.127m². 2 The third closed area 12 and the fourth closed area 13 are the same, and their area S5 = (0.08~0.09)S4. The distance L1 from the center of the third closed area 12 to the protective net 1 is not equal to the distance L2 from the center of the fourth closed area to the protective net 1. The length L3 of the third closed area 12 and the fourth closed area 13 in the horizontal direction is 42mm-44mm. For example, the distance L1 from the center of the third closed area 12 to the protective net 1 is 69mm~71mm, and the distance L2 from the center of the fourth closed area to the protective net 1 is 38mm~40mm. Of course, in other embodiments, the specific dimensions of each part of the oil net 8 can be adjusted as needed.

[0068] Example 3

[0069] like Figure 8 As shown, this utility model also provides a range hood, the range hood 17 includes a front cover plate 14 and an oil filter 8 assembly as described above, the front cover plate 14 is located in front of the second enclosed area and covers the second enclosed area 4.

[0070] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A protective net for a range hood, characterized in that, The protective net is installed at the air inlet of the fan. The protective net includes an open area, a first closed area, and a second closed area. The center of the first closed area coincides with the center of the protective net. The open area is located on the outer periphery of the first closed area. The second closed area is located on the upper part of the protective net and above the open area.

2. The protective net for a range hood as described in claim 1, characterized in that, The protective net is disc-shaped and includes an outer frame, a central plate, and a concave curved surface connecting the outer frame and the central plate. The first enclosed area is located on the central plate.

3. The protective net for a range hood as described in claim 2, characterized in that, The first enclosed area is a circular region centered on the center of the protective net, and the radius of the first enclosed area is smaller than the radius of the protective net.

4. The protective net for a range hood as described in claim 3, characterized in that, The second closed area is an arc-shaped region formed by taking the upper end of the protective net as its apex, and the height of the arc-shaped region is less than the radius of the protective net.

5. An oil mesh assembly, characterized in that, It includes an oil mesh and a protective mesh as described in any one of claims 1-4. The oil mesh is disposed in front of the protective mesh. The oil mesh includes a left air intake area and a right air intake area and an intermediate air intake area located between the left air intake area and the right air intake area. A third closed area is provided between the left air intake area and the intermediate air intake area, and a fourth closed area is provided between the right air intake area and the intermediate air intake area.

6. The oil mesh assembly as described in claim 5, characterized in that, The oil mesh covers the open area and the first closed area of ​​the protective mesh.

7. The oil mesh assembly as described in claim 6, characterized in that, The left and right air intake zones are symmetrically arranged on both sides of the oil screen, and air intake mesh holes are provided on the left, middle, and right air intake zones.

8. The oil mesh assembly as described in claim 7, characterized in that, The third and fourth enclosed areas are rectangular regions without openings, symmetrically arranged between the left and right air intake areas.

9. The oil mesh assembly as described in claim 8, characterized in that, The center point of the oil net is located to the left of the center point of the protective net.

10. A range hood, characterized in that, It includes a front cover and an oil mesh assembly as described in any one of claims 5-9, wherein the front cover is located in front of the second enclosed area.

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