Rectifying net structure and range hood

Abstract

The application discloses a rectifying net structure and an extractor hood, and belongs to the technical field of the extractor hood. The rectifying net structure is arranged at a vortex position near an air inlet of a centrifugal fan; the rectifying net structure comprises one rectifying net or at least two rectifying nets arranged side by side along a first direction; each rectifying net is a hollow three-dimensional structure, and the three-dimensional structure is composed of a first plane net piece and a special-shaped net piece connected in sequence; the vortex can be rotated into the rectifying net by the special-shaped net piece and finally flow out of the rectifying net by the first plane net piece. The extractor hood comprises the rectifying net structure; the extractor hood further comprises a machine box and a centrifugal fan arranged in the machine box, a gap is formed between an air inlet of the centrifugal fan and an inner side wall of the machine box, the rectifying net structure is arranged at the gap, and the first plane net piece is parallel to the air inlet of the centrifugal fan. The application can effectively solve the problems of high noise and low aerodynamic performance of the existing extractor hood.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a rectifier network structure and a range hood. Background Art

[0002] Range hoods use centrifugal fans to extract kitchen fumes. When the centrifugal fan is assembled into the range hood chassis, the air intake space becomes narrow. This, combined with the inherent structural limitations of the centrifugal fan's volute, creates vortices near the air inlet. Furthermore, the various concave and convex structures within the chassis also contribute to vortices near the volute's air inlet. These vortices not only increase the airflow's resistance along the way, reducing the overall aerodynamic performance, but also contribute to the noise generated by the vortices, combined with the inherent noise of the centrifugal fan, making the range hood noisy. Summary of the Invention

[0003] The object of the present invention is to provide a rectifier network structure that can be used in range hoods to effectively solve the problems of high noise and low aerodynamic performance of existing range hoods.

[0004] Another object of the present invention is to provide a range hood that can effectively solve the problems of high noise and low aerodynamic performance of existing range hoods.

[0005] To achieve the above objectives, the following technical solutions are provided:

[0006] A rectifying mesh structure is used to be arranged at a vortex near the air inlet of a centrifugal fan; the rectifying mesh structure includes a rectifying mesh or at least two rectifying meshes arranged in parallel along a first direction; each rectifying mesh is a hollow three-dimensional structure, and the three-dimensional structure is composed of a first planar mesh and a special-shaped mesh connected end to end in sequence; the vortex can be rotated into the rectifying mesh by the special-shaped mesh and finally flow out of the first planar mesh.

[0007] Furthermore, the rectifying mesh is extended along a second direction; the first direction is perpendicular to the second direction, and the plane where the first direction and the second direction are located is parallel to the first planar mesh.

[0008] Furthermore, the cross-sectional shape of the rectifying network is polygonal or semicircular.

[0009] Furthermore, the rectifying net also includes a connecting structure provided on the special-shaped mesh, and the connecting structure is used to install the rectifying net structure on the chassis of the range hood.

[0010] Furthermore, the cross-sectional shape of the rectifying mesh is triangular; the special-shaped mesh includes two second planar meshes arranged at an angle, and the free ends of the two second planar meshes are respectively connected to the first planar mesh; the connecting structure is arranged at the connection between the two second planar meshes.

[0011] Furthermore, the connection structure includes a connection plate provided on the special-shaped mesh.

[0012] Furthermore, the mesh shapes of the first planar mesh and the special-shaped mesh are rhombus, rectangle or hexagon.

[0013] Furthermore, the width of the ribs between two adjacent meshes of the first planar mesh and the special-shaped mesh is 0.3-0.8 mm.

[0014] A range hood, comprising any of the above-mentioned rectifier mesh structures; the range hood also includes a chassis and a centrifugal fan arranged inside the chassis, there is a gap between the air inlet of the centrifugal fan and the inner wall of the chassis, the rectifier mesh structure is arranged at the gap, and the first planar mesh and the air inlet of the centrifugal fan are parallel to each other.

[0015] Furthermore, the rectifier network structure is fixed on the inner wall of the chassis.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) By setting the rectifying net as a three-dimensional structure and placing it at the vortex near the air inlet of the centrifugal fan, the vortex is first rotated into the rectifying net by the special-shaped mesh in the three-dimensional structure, and the mesh of the rectifying net breaks up the vortex to perform a rectifying operation. The vortex airflow flows more smoothly after passing through the rectifying net, reducing the vortex noise while also reducing the resistance along the flow of the intake airflow, thereby improving the aerodynamic performance of the whole machine. The rectified airflow finally flows out from the first planar mesh; the rectifying net can be provided with one or at least two in parallel according to the size of the vortex, which fully ensures that the vortex near the air inlet of the centrifugal fan can pass through the rectifying net for rectification, thereby improving the rectification effect of the whole machine;

[0018] 2) Since eddy currents are generally generated in the gap between the air inlet of the centrifugal fan and the chassis, the rectifier mesh structure is placed in the gap; the first plane mesh is parallel to the air inlet of the centrifugal fan, and the rectified airflow flows out of the first plane mesh and directly enters the air inlet, which improves the turbulence of the airflow entering the air inlet and reduces the impact on the airflow near the air inlet; at the same time, since the rectifier mesh structure is not directly installed at the air inlet, it will not occupy the air inlet area and increase flow losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1Schematic diagram of a rectifier network structure according to an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the assembly of the rectifier network structure and the chassis in the embodiment of the present invention Figure 1 ;

[0021] Figure 3 Schematic diagram of the assembly of the rectifier network structure and the chassis in the embodiment of the present invention Figure 2 ;

[0022] Figure 4 for Figure 3 A partial enlarged schematic diagram of point A in the middle;

[0023] Figure 5 Schematic diagram of the cross section of the first rectifier network in an embodiment of the present invention;

[0024] Figure 6 Schematic diagram of a cross section of a second type of rectifier network according to an embodiment of the present invention;

[0025] Figure 7 Schematic diagram of the cross section of the third rectifier network in an embodiment of the present invention;

[0026] Figure 8 Schematic cross-sectional view of a first rectifier network structure according to an embodiment of the present invention;

[0027] Figure 9 is a cross-sectional schematic diagram of a second rectifier network structure according to an embodiment of the present invention;

[0028] Figure 10 Schematic cross-sectional view of a third rectifier network structure according to an embodiment of the present invention;

[0029] Figure 11 Schematic diagram of the first mesh shape in an embodiment of the present invention;

[0030] Figure 12 Schematic diagram of the second mesh shape in an embodiment of the present invention;

[0031] Figure 13 Schematic diagram of a third mesh shape in an embodiment of the present invention;

[0032] Figure 14 This is a simulation diagram of the gas flow of the range hood in an embodiment of the present invention.

[0033] Reference numerals:

[0034] 100, rectifier network structure; 200, chassis; 300, centrifugal fan; 301, air inlet;

[0035] 10. Rectifier network;

[0036] 11. First planar mesh; 12. Special-shaped mesh; 121. Second planar mesh; 13. Connection structure; 131. Connection plate; 132. Mounting hole; 14. Mesh hole; 15. Rib. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0043] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0044] refer to Figure 1-4 This embodiment provides a rectifying net structure 100, which is mainly used in range hoods and is arranged at the vortex near the air inlet 301 of the centrifugal fan 300 of the range hood. Specifically, the rectifying net structure 100 includes a rectifying net 10 or at least two rectifying nets 10 arranged in parallel along the first direction (i.e., the X direction in the accompanying drawings); each rectifying net 10 is a hollow three-dimensional structure, and the three-dimensional structure is composed of a first plane mesh 11 and a special-shaped mesh 12 connected in sequence from end to end; in specific implementation, the vortex can be rotated into the rectifying net 10 by the special-shaped mesh 12, and finally flow out from the first plane mesh 11 (see the accompanying drawings). Figure 1 and 4 The black solid arrow in the figure indicates the flow direction of the vortex airflow).

[0045] In the above-mentioned rectifying net structure 100, by setting the rectifying net 10 as a three-dimensional structure and placing it at the vortex near the air inlet 301 of the centrifugal fan 300, the vortex is first rotated into the rectifying net 10 by the special-shaped mesh 12 in the three-dimensional structure, and the vortex is broken up by the mesh 14 of the rectifying net 10 for rectification. After passing through the rectifying net 10, the vortex airflow flows more smoothly, reducing the vortex noise while also reducing the resistance along the airflow, thereby improving the aerodynamic performance of the entire machine. The rectified airflow finally flows out from the first planar mesh 11. Depending on the size of the vortex, one rectifying net 10 can be set, or at least two can be set in parallel, fully ensuring that the vortex near the air inlet 301 of the centrifugal fan 300 can all pass through the rectifying net 10 for rectification, thereby improving the rectification effect of the entire machine.

[0046] Specifically, for the three-dimensional rectifying net 10, the cross-sectional shape of a single rectifying net 10 is polygonal or semicircular; Figure 5-7 In this embodiment, only the cross-sectional shapes of the rectifying net 10 are shown as triangles, rectangles, and semicircles. Of course, in some other embodiments, the cross-sectional shapes of the rectifying net 10 can also be other special shapes, which are not specifically limited here. Figure 8-10 The figure shows that for a rectifying net structure 100 having at least two rectifying nets 10 arranged in parallel, the specific cross-sectional shape thereof is a continuous polygon or semicircle. In specific implementation, for a plurality of rectifying nets 10 arranged in a continuous manner, if two adjacent rectifying nets 10 partially overlap, the overlapping portion can share a mesh to simplify the structure. For example, Figure 9 As shown, the cross-section of a single rectifying net 10 is rectangular. Thus, the overlapping sides of two adjacent rectifying nets 10 can share a mesh, which is part of both the left rectifying net 10 and the right rectifying net 10. In other embodiments, the cross-section of the rectifying net 10 can be a combination of different shapes, rather than a single continuous polygonal or circular shape, and this is not a specific limitation.

[0047] During specific implementation, the flow environment inside different range hoods is different, and the size, position and number of vortices are also different; depending on the size and number of vortices, a rectifying mesh structure 100 can be placed at each vortex, or multiple rectifying mesh structures 100 can be placed at the same vortex; the specific number and cross-sectional shape of the rectifying meshes 10 in each rectifying mesh structure 100 can also be reasonably arranged according to needs, and ultimately, as long as the vortex can be effectively rectified through the mesh 14 of the rectifying mesh 10, it will be sufficient.

[0048] Furthermore, the rectifying net 10 is extended along the second direction (i.e., the Y direction in the accompanying drawings); that is, the rectifying net 10 is a three-dimensional structure in the form of an elongated strip. The purpose of such a setting is that the vortex has a certain area, and only a rectifying net 10 that is long enough is placed at the vortex to ensure that the vortex airflow can all be rotated into the rectifying net 10 to complete the rectification. Furthermore, the first direction is perpendicular to the second direction; the first direction and the second direction are set to be perpendicular to each other in order to more reasonably arrange multiple rectifying nets 10 to obtain a larger rectification space. In specific implementation, the plane where the first direction and the second direction are located is parallel to the first planar mesh 11; the above setting can make the first planar mesh 11 of each rectifying net 10 located in the same plane, and then the vortex flows out uniformly from the same plane after rectification, thereby improving the consistency of the airflow and effectively preventing turbulent airflow from entering the air inlet 301.

[0049] After the centrifugal fan 300 is placed in the range hood chassis 200, the air intake space becomes narrow. Furthermore, because the air velocity near the centrifugal fan 300's outlet is high, while the air velocity toward the volute tongue is low, eddies form near the centrifugal fan 300's air inlet 301, generating corresponding eddy current noise. Furthermore, because the chassis 200 includes concave and convex structures for arranging other components or enhancing its strength, the intake airflow also forms eddies of varying sizes as it passes through these concave and convex structures. Therefore, the size, number and position of the vortexes formed are different depending on the specific structure of the range hood; however, the chassis 200 structure and the placement position of the centrifugal fan 300 of a certain model of range hood are determined, and the size, number and position of the vortexes generated are also determined. At this time, the specific placement position of the rectifier mesh structure 100, the specific number of rectifier meshes 10 of each rectifier mesh structure 100 and the structure of the special-shaped mesh 12 can be reasonably arranged. The ultimate goal is to ensure that each vortex airflow can be rotated into the three-dimensional rectifier mesh 10 by the special-shaped mesh 12 to be rectified through the mesh 14, and finally flow out from the first planar mesh 11 located on the same plane.

[0050] refer to Figure 1 and Figure 4 The rectifier mesh 10 also includes a connecting structure 13 disposed on the shaped mesh sheet 12. This connecting structure 13 is used to mount the rectifier mesh 100 on the range hood chassis 200. This connecting structure 13 is used to mount the rectifier mesh 100 on the chassis 200, rather than on the air inlet 301 of the centrifugal fan 300. Therefore, the connecting structure 13 does not occupy the effective flow area of ​​the air inlet 301, and the entire structure does not introduce significant flow resistance. The intake airflow can smoothly enter the air inlet 301, ensuring the aerodynamic performance of the entire machine.

[0051] Specifically, the meshes 14 of the first planar mesh 11 and the shaped mesh 12 are in a rhombus, rectangular, or hexagonal shape. More specifically, to prevent the ribs 15 between adjacent meshes 14 from being too wide, which would increase the gas flow resistance, the width of the ribs 15 between adjacent meshes 14 of the first planar mesh 11 and the shaped mesh 12 is set to 0.3-0.8 mm.

[0052] Example, reference Figure 1 and Figure 4The cross-section of a single rectifier mesh 10 is triangular; specifically, the special-shaped mesh 12 includes two second planar meshes 121 arranged at an angle, and the free ends of the two second planar meshes 121 are respectively connected to the first planar mesh 11, thereby forming a three-dimensional rectifier mesh 10 with a triangular cross-section. After the rectifier mesh 10 is placed in the vortex near the air inlet 301, the airflow first rotates into the rectifier mesh 10 through one of the two second planar meshes 121 and undergoes the first rectification at the same time. The vortex then swirls and flows through the other second planar mesh 121 for the second rectification. Finally, it undergoes the third rectification when it flows out of the first planar mesh 11. After three rectifications, the vortex is broken up, reducing the turbulence of the airflow, improving the aerodynamic performance of the entire machine, and reducing vortex noise.

[0053] Specifically, for the above-mentioned rectifier network structure 100, the connecting structure 13 is provided at the connection between the two second planar mesh sheets 121. More specifically, the connecting structure 13 includes a connecting plate 131 provided on the special-shaped mesh sheet 12. The connecting plate 131 is a planar structure, and the connecting plate 131 is detachably connected to the chassis 200 of the range hood. Optionally, the connecting plate 131 can be fixed to the chassis 200 by gluing. Further optionally, mounting holes 132 are provided on the connecting plate 131, so that the connecting plate 131 can also be fixed to the chassis 200 by bolting. Optionally, multiple connecting plates 131 are provided at intervals along the second direction. In some other embodiments, the connecting structure 13 can also be fixed to the chassis 200 by snapping.

[0054] refer to Figure 2 and Figure 3 This embodiment further provides a range hood, comprising the above-mentioned rectifying net structure 100; the range hood further comprises a chassis 200 and a centrifugal fan 300 arranged inside the chassis 200, and there is a gap between the air inlet 301 of the centrifugal fan 300 and the inner wall of the chassis 200, the rectifying net structure 100 is arranged in the gap, and the first planar mesh 11 and the air inlet 301 of the centrifugal fan 300 are parallel to each other.

[0055] Since eddy currents are generally generated in the gap between the air inlet 301 of the centrifugal fan 300 and the chassis 200, the rectifying mesh structure 100 is placed in the gap; the first planar mesh 11 is parallel to the air inlet 301 of the centrifugal fan 300, and the rectified airflow flows out of the first planar mesh 11 and directly enters the air inlet 301, thereby improving the degree of turbulence of the airflow entering the air inlet 301 and reducing the impact on the airflow near the air inlet 301; at the same time, since the rectifying mesh structure 100 is not directly installed at the air inlet 301, it will not occupy the area of ​​the air inlet 301 and increase flow losses.

[0056] Furthermore, the rectifying mesh structure 100 is fixed to the inner side wall of the chassis 200. Since there is a gap between the inner side wall of the chassis 200 and the air inlet 301 of the centrifugal fan 300, and the two are generally arranged relative to each other, the rectifying mesh structure 100 is fixed to the inner side wall of the chassis 200, that is, the rectifying mesh structure 100 is fixed in a position away from the air inlet 301. There is no connection between the rectifying mesh structure 100 and the centrifugal fan 300, and the rectifying mesh structure 100 does not affect the effective air intake area of ​​the air inlet 301, thereby minimizing the resistance to the intake airflow.

[0057] In the prior art, most approaches directly add a planar rectifier mesh to the air inlet 301 to reduce eddy current noise. However, this approach reduces the effective air intake area of ​​the air inlet 301, increases flow losses, and reduces the aerodynamic performance of the entire machine. In this embodiment, since the rectifier mesh structure 100 is not directly installed at the air inlet 301, it does not affect the rectification of eddy currents, nor does it occupy the area of ​​the air inlet 301 or obstruct the air intake of the air inlet 301, thereby minimizing the impact on the aerodynamic performance of the entire machine.

[0058] Figure 14 This is a simulation diagram of the gas flow of a certain range hood model. It can be seen that two large vortices are generated near the air inlet 301. Based on the range hood airflow simulation described above, a rectifier mesh structure 100 was installed within the chassis 200 and positioned at one of the vortices. Then, an air performance test was conducted on the range hood to obtain the corresponding gas flow parameters. A comparative example was also designed without the rectifier mesh structure 100. The gas flow parameters under the two operating conditions were compared to form the following table:

[0059] Table 1 Gas flow parameters under different working conditions

[0060]

[0061] As can be seen from the above table, after the rectification network structure 100 is installed, the air intake volume and aerodynamic efficiency of the whole machine are increased, and the noise is reduced. This shows that the rectification network structure 100 plays an effective rectification role, reducing the overall noise without affecting the aerodynamic performance of the whole machine.

[0062] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A rectifier network structure, characterized in that: Used to be arranged at a vortex near the air inlet (301) of a centrifugal fan (300) of a range hood; the rectifying net structure comprises a rectifying net (10) or at least two rectifying nets (10) arranged in parallel along a first direction; each rectifying net (10) is a hollow three-dimensional structure, and the three-dimensional structure is composed of a first plane mesh (11) and a special-shaped mesh (12) connected end to end in sequence; the vortex can be rotated into the rectifying net (10) by the special-shaped mesh (12) and finally flow out from the first plane mesh (11), and the first plane mesh (11) and the air inlet (301) of the centrifugal fan (300) are parallel to each other; The rectifying net (10) is extended along a second direction; the first direction is perpendicular to the second direction, and the plane where the first direction and the second direction are located is parallel to the first planar mesh (11); The mesh holes (14) of the first planar mesh (11) and the special-shaped mesh (12) are in the shape of a rhombus, a rectangle or a hexagon.

2. The rectifier network structure according to claim 1, characterized in that: The cross-sectional shape of the rectifying net (10) is polygonal or semicircular.

3. The rectifier network structure according to claim 1, characterized in that: The rectifying net (10) further comprises a connecting structure (13) provided on the special-shaped net sheet (12), wherein the connecting structure (13) is used to install the rectifying net structure on a chassis (200) of the range hood.

4. The rectifier network structure according to claim 3, characterized in that: The cross-section of the rectifying mesh (10) is triangular; the special-shaped mesh (12) comprises two second planar meshes (121) arranged at an angle, the free ends of the two second planar meshes (121) being respectively connected to the first planar mesh (11); and the connecting structure (13) is provided at the connection between the two second planar meshes (121).

5. The rectifier network structure according to claim 4, characterized in that: The connection structure (13) comprises a connection plate (131) provided on the special-shaped mesh (12).

6. The rectifier network structure according to claim 1, characterized in that: The width of the ribs (15) between two adjacent mesh holes (14) of the first planar mesh (11) and the special-shaped mesh (12) is 0.3-0.8 mm.

7. A range hood, characterized in that: The range hood comprises the rectifying network structure according to any one of claims 1 to 6; the range hood further comprises a chassis (200) and a centrifugal fan (300) arranged inside the chassis (200), a gap being provided between an air inlet (301) of the centrifugal fan (300) and an inner wall of the chassis (200), and the rectifying network structure being arranged at the gap.

8. The range hood according to claim 7, characterized in that: The rectifier network structure is fixed on the inner side wall of the chassis (200).

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