An oil mesh for a range hood

Abstract

The present invention discloses an oil mesh for a range hood, which includes a first oil mesh and a second oil mesh. The second oil mesh is arranged above the first oil mesh. The first oil mesh and the second oil mesh are respectively formed with oil guiding columns, and there is a gap for air to pass through between two adjacent oil guiding columns. The oil guiding column is a concave arc surface structure with an opening facing upwards. By designing the oil guiding column as a concave arc surface structure with an opening facing upwards, the arc surface structure is more conducive to reflecting and refracting to block noise, and at the same time, the arc surface structure has a small resistance to gas.

Description

Technical Field

[0001] The present invention relates to an oil screen, and more particularly to an oil screen with a noise reduction function. Background Art

[0002] When the multi-wing centrifugal fan built in the range hood operates, the generated noise is transmitted into the room through the following three ways: 1. The noise enters the room from the inlet through the air duct of the range hood; 2. The noise is reflected by the duct wall surface and enters the room through the duct inlet; 3. The noise is transmitted into the room through the duct outlet. After testing, the noise at the inlet of the oil screen is 13 dB higher than the noise in the four directions of front, back, left and right. Therefore, reducing the noise at the inlet of the range hood can greatly reduce the noise of the range hood. The existing filter screens of range hoods are generally single-layer or double-layer or multi-layer structures, which mainly play the role of filtering and condensing oil fumes. Based on this, how to propose an oil screen with a noise reduction function is the main technical problem to be solved by the present invention. Summary of the Invention

[0003] In order to solve the technical problem of the large noise of the fan of the existing range hood, the present invention proposes an oil screen that can reflect noise and reduce the noise transmitted into the room.

[0004] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0005] An oil screen includes a first oil screen and a second oil screen. The second oil screen is arranged above the first oil screen. The first oil screen and the second oil screen are respectively formed with oil guiding columns. There is a gap for air to pass through between adjacent two oil guiding columns. The oil guiding column is a concave arc surface structure with an upward opening.

[0006] Further, the oil guiding columns of the first oil screen and the second oil screen are arranged in a staggered tooth distribution.

[0007] Further, the cross section of the oil guiding column is in a parabolic shape, and the parabolic equation is x² = 2py, where the value range of p is 1.1 mm - 1.8 mm.

[0008] Further, the width of the mouth of the oil guiding column is L, and the distance between two oil guiding columns is 0.9L - 1.1L, where L > 0.

[0009] Further, the width of the mouth of the oil guiding column is L, and the distance between the first oil screen and the second oil screen is 7L - 1.1L, where L > 0

[0010] Further, a closed oil groove is arranged below the first oil screen, and the oil dripping from the first oil screen falls into the oil groove.

[0011] Further, the first oil screen and the second oil screen are of a planar structure, a frustum structure or an inverted frustum structure.

[0012] Further, when the first oil screen and the second oil screen are of a frustum structure, the lower end of the first oil screen is turned outwards to form an out-turned edge, the lower end of the second oil screen has a vertical edge, the vertical edge is lapped on the out-turned edge, a plurality of oil guiding holes are formed in the out-turned edge, and the orthographic projection of the oil guiding holes on the plane where the oil tank is located is located in the oil tank.

[0013] Further, at least one boss with an internal thread is formed on the upper surface of the out-turned edge, connecting ears corresponding to the bosses one by one are arranged on the vertical edge, screw holes are formed in the connecting ears, and screws pass through the screw holes and are screwed into the internal threads of the bosses.

[0014] Further, a filter screen is further arranged between the first oil screen and the second oil screen.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows: by designing the oil guiding column of the oil screen of the present invention into a concave arc surface structure with an upward opening, the arc surface structure is more conducive to reflecting and refracting to block noise. When the range hood works, after the noise sound waves generated by the fan hit the reflection wall surface of the first oil screen, most of them are reflected back to the air duct by the wall surface, and part of the noise reaches the second oil screen through the first oil screen and is reflected by the reflection wall surface of the second oil screen, and only a small amount of sound waves enter the room, so the noise can be effectively reduced. At the same time, the arc surface structure has a small resistance to gas. The upward rising air flow first enters the first oil screen and moves obliquely upwards along the outer surface of the oil guiding column. When it encounters the outer surface of the oil guiding column of the second oil screen, the air flow makes a secondary turn. Part of it moves obliquely upwards along the outer shape of the second layer of oil guiding column and is sucked into the main fan, and the other part of the air flow flows to the inner surface of the oil guiding column of the first layer of oil screen, generates a swirl and then continues to move upwards and is sucked into the main fan. Through such a gas movement path, the contact area between the oil fume gas and the oil guiding column of the oil screen is increased, the separation effect of the oil liquid and the air is better, and the separated oil drops can be guided downwards along the oil guiding column to the surroundings and directly pass through the oil path system and drip into the oil cup, and there is no situation of dripping oil through holes.

[0016] After reading the detailed description of the embodiments of the present invention in conjunction with the drawings, other features and advantages of the present invention will become clearer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the oil mesh of the range hood proposed by the invention;

[0019] Figure 2 It is Figure 1 an enlarged view of part A of

[0020] Figure 3 It is Figure 1 an enlarged view of part B of

[0021] Figure 4 It is Figure 1 an enlarged view of part C of

[0022] Figure 5 It is Figure 2 a cross-sectional view of the oil guide column in

[0023] Figure 6 It is Figure 5 an air flow simulation diagram of the oil guide column in

[0024] Figure 7 It is Figure 2 a cross-sectional view of the oil guide columns of the first oil mesh and the second oil mesh in

[0025] Figure 8 It is Figure 7 an air flow simulation diagram of the oil guide column in

[0026] Figure 9 It is a schematic structural diagram of another embodiment of the oil mesh of the range hood proposed by the invention;

[0027] Figure 10 It is a schematic structural diagram of yet another embodiment of the oil mesh of the range hood proposed by the invention. Specific Embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0029] Embodiment 1. In this embodiment, a range hood oil mesh is proposed, as shown in Figures 1-5As shown in the figure, it includes a first oil screen 11 and a second oil screen 12. The second oil screen 12 is arranged above the first oil screen 11. The first oil screen 11 has oil guiding columns 110, and the second oil screen 12 has oil guiding columns 120. There is a gap for air to pass through between adjacent two oil guiding columns. A first gap 111 is formed between adjacent two oil guiding columns of the first oil screen 11, and a second gap 121 is formed between adjacent two oil guiding columns of the second oil screen 12. The oil guiding columns of the first oil screen 11 and the oil guiding columns of the second oil screen 12 are both concave arc surface structures with openings facing upward. By designing the oil guiding columns as concave arc surface structures with openings facing upward, the arc surface structure is more conducive to reflecting and refracting to block noise, and at the same time, the arc surface has the least resistance to gas. When the suction hood is working, after the noise sound waves generated by the fan hit the oil guiding columns of the first oil screen 11, most of them are reflected back to the air duct by the arc surface of the oil guiding columns of the first oil screen 11. Part of the noise passes through the first gap 111 to reach the second oil screen, and is reflected by the arc surface of the oil guiding columns of the second oil screen. The reflected sound waves are reflected back to the air duct through the first gap, and finally only a small amount of sound waves enter the room through the second gap 112, which can effectively reduce the noise. As Figure 6 shown, part of the ascending air flow directly passes through the gap between the oil guiding columns, and the other part rises to the oil guiding columns. Due to the smooth arc surface structure of the oil guiding columns, the air flow moves obliquely upward along the outer arc surface of the oil guiding columns, and the arc surface structure of the oil guiding columns has the least resistance to gas.

[0030] The oil guiding columns of the first oil screen 11 and the oil guiding columns of the second oil screen 12 are arranged in a staggered tooth distribution. As Figure 7 、 Figure 8 shown, the air flow moves obliquely upward along the outer arc surface of the oil guiding columns. The ascending air flow first passes through the first oil screen 11. Part of the air flow rises to the oil guiding columns of the first oil screen, and the air flow moves obliquely upward along the outer arc surface of the oil guiding columns and continues to rise through the first gap 111. The other part of the air flow directly passes through the first oil screen 11 through the first gap 111. Due to the staggered tooth distribution of the oil guiding columns of the first oil screen 11 and the oil guiding columns of the second oil screen 12, this part of the air flow will encounter the oil guiding columns of the second oil screen 12 after passing through the first gap 111. When it encounters the outer arc surface of the oil guiding columns of the second oil screen, the air flow makes a secondary turn. Part of it moves obliquely upward along the outer shape of the oil guiding columns of the second oil screen and is sucked into the main fan. The other part of the air flow flows to the inner surface of the oil guiding columns of the first layer of oil screen, generates a swirl, and then continues to rise and is sucked into the main fan. Through such a gas movement path, the contact area between the oil fume gas and the oil screen oil guiding columns is increased, and the effect of separating the oil liquid from the air is better. The separated oil droplets can flow down along the oil guiding columns to the surroundings and directly pass through the oil circuit system and drip into the oil cup, and there is no situation of dripping oil through holes.

[0031] As Figure 5As shown, it is preferred that the cross-section of the oil guiding column is parabolic. Here, the oil guiding column refers to the oil guiding column of the first oil screen 11 and / or the oil guiding column of the second oil screen 12. When both the oil guiding column of the first oil screen 11 and the oil guiding column of the second oil screen 12 are parabolic, the effect is the best. The parabolic equation is x² = 2py, where the x-axis is along the horizontal direction and perpendicular to the length direction of the oil guiding column, the y-axis is along the vertical direction and passes through the central axis of the oil guiding column, and the value range of p is 1.1 mm - 1.8 mm. Experiments show that the shape of the oil guiding column set according to this parabolic equation has less resistance to gas than a simple arc or straight line, and is more conducive to blocking noise through reflection and refraction.

[0032] Combined with the size of the range hood, the size of the oil screen should not be too large or too small. For example, Figure 5 、 Figure 7 As shown, for the convenience of actual processing of the oil screen and reducing the resistance of the oil screen to the air flow, the best value range of the opening size L of the parabola is 6 mm - 8 mm. It can leave enough gaps without blocking the wind and ensure sufficient contact area with the oil fume for oil fume separation.

[0033] The shapes of the first oil screen 11 and the second oil screen 12 can be a planar structure, a frustum-shaped structure as shown in Figure 10 or an inverted frustum-shaped structure as shown in Figure 9 . It can be designed accordingly according to the selection structure of the smoke collecting hood of the range hood. When the oil screen adopts a frustum-shaped structure or an inverted frustum-shaped structure, it has at least 4 inclined sides, and a number of oil guiding columns are arranged in columns on each side. The gap for the oil fume to pass between the adjacent two oil guiding columns mentioned above refers to the gap between the adjacent two oil guiding columns on the same side of the oil screen. The connection part of the two sides is between the adjacent two oil guiding columns on different sides, and there is no need to open a gap. The lengths of the oil guiding columns at different positions on the same plane may be different, and they are reasonably set according to the shape of the plane where they are located.

[0034] The oil guiding column has two arc edges on both sides, and the ends of the two adjacent arc edges are connected by a connecting edge. These two arc edges are respectively located on two adjacent oil guiding columns. For example, Figure 2 as shown, taking the first oil screen as an example, the oil guiding column 110 is adjacent to the oil guiding column 112. The oil guiding column 110 has arc edges 110a and 110b, and the oil guiding column 112 has arc edges 112a and 112b. The arc edge 110b is adjacent to the arc edge 112a, and these two arc edges are respectively located on two different oil guiding columns (oil guiding column 110, oil guiding column 112). The arc edge 110b and the arc edge 112a are connected by a connecting edge 115, as shown in Figure 2 . Both ends of the arc edge are connected with a connecting edge. Therefore, the two adjacent arc edges and the end edges at both ends form a closed structure, which can better guide the oil fume, and at the same time is conducive to increasing the contact area with the oil fume to maximize the separation of the oil fume.

[0035] Preferably, as Figure 5 shown, the distance between two adjacent oil guiding columns is M, and the optimal value range of M is 0.9L - 1.1L. The distance between two adjacent oil guiding columns is also the width of the gap port between these two oil guiding columns. Within this width value range, neither large wind resistance will be generated, and the arc surface area of the oil guiding columns is ensured, enabling more sufficient contact with the oil fume.

[0036] The optimal distance between the first oil mesh 11 and the second oil mesh 12 is 7L - 1.1L, where L is the width of the mouth of the oil guiding column.

[0037] Taking the oil mesh in the shape of a frustum as an example, the oil guiding columns of the first oil mesh 11 and the second oil mesh 12 come into contact with the oil fume, agglomerate the oil in the oil fume to form oil droplets, and the oil droplets flow along the oil guiding columns. There is a closed oil trough 13 arranged below the first oil mesh 11, and the oil droplets flowing down from the first oil mesh 11 fall into the oil trough 13, preventing them from dripping onto the kitchen countertop and increasing the cleaning burden.

[0038] The oil trough 13 is a closed structure in a circle, which is not convenient for disassembly and cleaning. Preferably, the oil trough 13 is connected with an oil cup (not shown in the figure). The oil in the oil trough 13 converges and flows into the oil cup. The oil cup has a smaller volume than the oil trough, which is convenient for assembly and disassembly and easy to clean.

[0039] Still taking the first oil mesh and the second oil mesh in the shape of a frustum as an example, the lower end of the first oil mesh 11 is turned outwards to form an out-turned edge 113. The lower end of the second oil mesh 12 has a circle of vertical edges 122. The vertical edges 122 of the second oil mesh 12 overlap on the out-turned edge 113. A plurality of oil guiding holes 114 are opened on the out-turned edge 113, and the orthographic projection of the oil guiding holes towards the plane where the oil trough 13 is located is within the oil trough 13. The oil droplets agglomerated by the second oil mesh 12 flow down along its oil guiding columns. Since the vertical edges 122 overlap on the out-turned edge 113, the oil droplets of the second oil mesh continue to flow down along the vertical edges to the out-turned edge 113. At the same time, the oil droplets agglomerated by the first oil mesh flow down along its oil guiding columns to the out-turned edge 113. The oil droplets then fall into the oil trough 13 through the oil guiding holes. The number and size of the oil guiding holes are determined according to the size and shape of the first oil mesh 11, and are not limited here. The periphery of the oil guiding holes can be lower than other positions of the out-turned edge 113, which is beneficial to converging the oil droplets.

[0040] The second oil screen 12 is fixed on the smoke collecting hood. The first oil screen 11 can be fixed to the smoke collecting hood or to the second oil screen. When the first oil screen 11 is fixed to the second oil screen 12, at least one boss 116 with internal threads is formed on the upper surface of the outward turning edge 113. A connecting ear 123 corresponding to the boss 116 one by one is provided on the vertical edge 122. A screw hole 124 is formed in the connecting ear 123. A screw passes through the screw hole 124 and is screwed into the internal thread of the boss 116, thereby fixing the first oil screen 11 to the second oil screen. The boss 116 can be fixed on the first oil screen 11 by welding or riveting. The screw hole 124 can be a through hole or a countersunk hole. The number of screw holes 124 is the same as the number of bosses 116. The number of bosses 116 can be determined according to the size and shape of the outward turning edge 113, and at the same time, the oil guiding holes 114 should be avoided.

[0041] A filter screen 14 can be added between the first oil screen 11 and the second oil screen 12 as needed. The form of the filter screen 14 can be diverse, such as activated carbon, wire mesh or perforated metal plate.

[0042] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention should also fall within the protection scope of the present invention.

Claims

1. An oil mesh for a range hood, characterized in that: It includes a first oil screen and a second oil screen. The second oil screen is arranged above the first oil screen. A number of oil guiding columns are sequentially arranged on one or more sides of the first oil screen and the second oil screen. There is a gap for air to pass through between two adjacent oil guiding columns. The oil guiding column has a concave arc surface structure with an upward opening, and the cross-section of the oil guiding column is in a parabolic shape, and the parabolic equation is x² = 2py, where the value range of p is 1.1 mm - 1.8 mm. The oil guiding columns of the first oil screen and the second oil screen are arranged in a staggered tooth distribution.

2. The oil screen according to claim 1, wherein: The width of the mouth of the oil guiding column is L, and the distance between two oil guiding columns is 0.9L - 1.1L, where L > 0.

3. The oil screen according to claim 1, wherein: The width of the mouth of the oil guiding column is L, and the distance between the first oil screen and the second oil screen is 7L - 1.1L, where L > 0.

4. The oil screen according to any one of claims 1 to 3, characterized in that: A closed oil groove is arranged below the first oil screen, and the oil dripping from the first oil screen falls into the oil groove.

5. The oil screen according to claim 4, wherein: The first oil screen and the second oil screen are in a planar structure, a frustum-shaped structure or an inverted frustum-shaped structure.

6. The oil screen according to claim 5, characterized in that: When the first oil screen and the second oil screen are in a frustum-shaped structure, the lower end of the first oil screen is turned outwards to form an outward turned edge, and the lower end of the second oil screen has a circle of vertical edges. The vertical edges are lapped on the outward turned edge, and a number of oil guiding holes are arranged on the outward turned edge. The orthographic projection of the oil guiding holes towards the plane where the oil groove is located is within the oil groove.

7. The oil screen according to claim 6, characterized in that: At least one convex platform with an internal thread is formed on the upper surface of the outward turned edge. A connecting ear corresponding to the convex platform is arranged on the vertical edge. A screw hole is arranged on the connecting ear, and a screw passes through the screw hole and is screwed into the internal thread of the convex platform.

8. The oil screen according to any one of claims 1 to 3, characterized in that: A filter screen is also arranged between the first oil screen and the second oil screen.

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