Rectifying device and range hood

Abstract

The utility model discloses a rectifying device and a range hood, belongs to the technical field of kitchen appliances, and aims to solve the problems of poor airflow rectifying effect and the like of the conventional rectifying device. The utility model discloses a rectifying device, which comprises a main rectifying net, a plurality of auxiliary rectifying nets, a plurality of connecting rods, a plurality of connecting rods, a plurality of connecting rods and a plurality of connecting rods, the rectifying part is arranged in the mounting through hole in a penetrating manner, and the rectifying part protrudes in the direction away from the impeller; at least two rectification through holes are formed in the rectification piece, and air flow reaches the impeller after being rectified through the rectification through holes. According to the rectifying device and the range hood disclosed by the utility model, the rectifying piece is additionally arranged on the main rectifying net, so that airflow parameters at the impeller can be effectively optimized, and pneumatic noise is reduced; a height difference exists between the main rectification net and the rectification piece, so that airflow reaching the position near a motor impeller can be rectified in advance, and the air inlet form of the multi-wing centrifugal fan is more suitable; the vortex near the center of the impeller can be weakened, the gas flowing uniformity is improved, and the overall noise of the range hood is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a rectifier device and a range hood. Background Art

[0002] Cooking produces fumes, which require a range hood to absorb and discharge to purify the indoor air. The core component of a range hood is the fan. The rotation of the fan impeller creates a negative pressure inside the range hood, which draws indoor fumes into the range hood, where they are absorbed and discharged.

[0003] Due to limited kitchen space, slim range hoods are becoming increasingly popular. However, the narrow airflow channels within these hoods result in unstable fan airflow, reducing efficiency, generating loud noise, and impacting the user's cooking experience.

[0004] To reduce noise, some existing range hoods have a rectifying device installed on the windward side of the impeller to address the vortexes that often occur near the center of the impeller. However, drawbacks of existing rectifying devices include a simple structure, poor rectification of the airflow at the center of the impeller inlet, and insignificant noise reduction. Utility Model Content

[0005] The purpose of the utility model is to provide a rectifying device and a range hood, which solves the problem that the existing rectifying device has poor airflow rectifying effect and has a good noise reduction effect.

[0006] To achieve this purpose, on the one hand, the present invention adopts the following technical solutions:

[0007] The rectifying device includes: a main rectifying net, which is provided with ventilation holes and mounting holes, through which air can pass; and a rectifying piece, which is inserted into the mounting holes and protrudes away from the impeller; the rectifying piece is provided with at least two rectifying holes, through which the air reaches the impeller after being rectified.

[0008] In one preferred embodiment, the rectifying component includes a main body portion and a mounting portion connected to each other, the rectifying flow hole is provided on the main body portion, and the mounting portion is fixedly connected to the mounting through hole.

[0009] In one preferred embodiment, the main body includes a first control portion and a second control portion connected to each other, and along the airflow direction, the first control portion is located at an upwind end compared to the second control portion.

[0010] In one of the preferred embodiments, the inner surface of the first control part is a planar first control surface, and the inner surface of the second control part forms a curved second control surface and a third control surface. When cross-sectioned along the airflow direction, the second control surface is arc-shaped and the third control surface is straight-line. The first control surface, the second control surface and the third control surface are tangently connected in sequence.

[0011] In one of the preferred embodiments, the rectifying holes on the first control part are hexagonal with a porosity of 40% to 60%; or, the rectifying holes on the first control part and the second control part are both strip holes, and the area of ​​the rectifying holes gradually increases along the airflow direction, with a porosity of 60% to 70%; or, the first control part and the second control part both include at least two circular longitude structures and at least two arc-shaped latitude structures bent by metal wire, and the longitude structures and the latitude structures are fixedly connected respectively, with a porosity of 70% to 85%; or, the rectifying holes on the first control part and the second control part are both hexagonal with a porosity of 70% to 85%, and reinforcing ribs are formed between the staggered rectifying holes on the second control part; or, the rectifying holes on the first control part are hexagonal, and the rectifying holes on the second control part are strip-shaped, with a porosity of 70%-85%.

[0012] In one preferred embodiment, the main rectifying network and the rectifying element are coaxially arranged.

[0013] In one preferred embodiment, the distance H between the edge of the mounting through hole and the outer surface of the fairing is ≤ 2 mm.

[0014] On the other hand, the present invention adopts the following technical solutions:

[0015] The range hood comprises an impeller and a housing. The range hood also comprises the above-mentioned rectifying device, which is connected to the housing. Along the airflow direction, the rectifying component is located at the upwind end of the impeller.

[0016] In one preferred embodiment, the inner surface of the fairing includes a first control surface, a second control surface, and a third control surface connected in sequence, the impeller includes an impeller cap, the distance between the impeller cap and the first control surface is L, the rotation radius of the impeller cap is R1, the distance between the intersection of the first control surface and the second control surface and the center of the top of the impeller cap is S, S 2 >L 2 +R1 2 .

[0017] In one preferred embodiment, the inner surface of the fairing includes a second control surface, the impeller includes an impeller cap, and a minimum value of a distance r between the impeller cap and the second control surface is greater than 8 mm.

[0018] The rectifier device disclosed in this utility model comprises a main rectifier mesh and a rectifier element. This rectifier element rectifies the airflow while ensuring ventilation, effectively optimizing airflow parameters at the impeller and reducing aerodynamic noise. The rectifier element protrudes away from the impeller, creating a height difference between the main rectifier mesh and the rectifier element. This allows for pre-rectification of the airflow near the motor impeller, making it more suitable for the air intake configuration of multi-blade centrifugal fans.

[0019] The range hood disclosed in the present utility model includes the above-mentioned rectifying device, which can rectify the airflow in advance to avoid the direct interaction between the airflow and the impeller cap, weaken the vortex near the center of the impeller, improve the uniformity of gas flow, reduce the overall noise of the range hood, and improve the working efficiency, performance and user experience of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of a rectifier device provided in a specific embodiment of the utility model;

[0021] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0022] Figure 3 This is one of the cross-sectional views of the combined structure of the rectifier and the impeller cap provided in the specific embodiment of the utility model;

[0023] Figure 4 This is the second cross-sectional view of the combined structure of the rectifier and the impeller cap provided in the specific embodiment of the utility model;

[0024] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0025] Figure 6 This is a structural diagram of the first type of rectifier provided in a specific embodiment of the utility model;

[0026] Figure 7 yes Figure 6 A partial enlarged view of point C in the middle;

[0027] Figure 8 This is a structural diagram of a second type of rectifier provided in a specific embodiment of the utility model;

[0028] Figure 9 This is a structural diagram of a third type of rectifier provided in a specific embodiment of the utility model;

[0029] Figure 10 This is a structural diagram of a fourth type of rectifier provided in a specific embodiment of the utility model;

[0030] Figure 11 yes Figure 10 A partial enlarged view of point D in the middle;

[0031] Figure 12 This is a structural diagram of a fifth type of rectifier provided in a specific embodiment of the utility model;

[0032] Figure 13 yes Figure 12 A partial enlarged view of point E in the middle.

[0033] In the picture:

[0034] 1. Main rectifier network; 2. Rectifier; 3. Impeller cap; 11. Ventilation hole; 12. Mounting hole; 21. Rectifier hole; 22. Main body; 23. Mounting part; 221. First control part; 222. Second control part; 223. First control surface; 224. Second control surface; 225. Third control surface. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar improvements without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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 should not be understood as a limitation to the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0038] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0041] This embodiment discloses a rectifier and a range hood including the rectifier. The rectifier is used to regulate airflow at the fan inlet, and the range hood is used to absorb and discharge indoor cooking fumes. The range hood also includes a fan equipped with an impeller and a housing mounted outside the fan. The rectifier is disposed on the windward side of the impeller.

[0042] like Figures 1 to 5 As shown, the rectifier device includes a main rectifier mesh 1 and a rectifier element 2. The main rectifier mesh 1 is provided with ventilation holes 11 and mounting holes 12, allowing airflow to pass through the ventilation holes 11. The rectifier element 2 is inserted into the mounting holes 12 and protrudes away from the impeller. Along the airflow direction, the rectifier element 2 is located upwind of the impeller and separated by a certain distance. The rectifier element 2 is provided with at least two rectifier holes 21, through which the airflow is rectified before reaching the impeller.

[0043] Adding a rectifying member 2 to the existing main rectifying network 1 can rectify the airflow while ensuring ventilation, which can effectively optimize the airflow parameters at the impeller, reduce aerodynamic noise, and improve the working efficiency, performance and user experience of the range hood. The rectifying member 2 protrudes in the direction away from the impeller, that is, along the axis OO direction of the rectifying member 2 (also the airflow direction), there is a height difference between the main rectifying network 1 and the rectifying member 2, which can rectify the airflow arriving near the motor impeller in advance, which is more suitable for the air intake form of a multi-blade centrifugal fan. The impeller includes an impeller cap 3. Advance rectification can avoid the direct interaction of the airflow with the impeller cap 3, weaken the vortex near the center of the impeller, improve the uniformity of the gas flow, and reduce the overall noise of the range hood.

[0044] The specific structure of the rectifying element 2 is not limited, as long as it can pre-rectify the airflow near the center of the motor impeller inlet. In this embodiment, the rectifying element 2 includes a main body 22 and a mounting portion 23 connected to each other. The rectifying holes 21 are provided on the main body 22, and the mounting portion 23 is fixedly connected to the mounting hole 12. To reduce wind resistance, the main body 22 is provided with a plurality of rectifying holes 21 arranged in an array, forming a grid structure.

[0045] Based on the above structure, the main body 22 includes a first control portion 221 and a second control portion 222 connected to each other. In the direction of airflow, the first control portion 221 is located at the upwind end compared to the second control portion 222. That is, the rectifier 2 has a basin-shaped structure, the mounting portion 23 is the edge of the basin, the second control portion 222 is the basin body, and the first control portion 221 is the basin bottom. The flat annular mounting portion 23 is easy to fix to the main rectifier network 1 by welding, riveting, etc., and the connection between the rectifier 2 and the main rectifier network 1 is more stable; the main body 22 has a simple and reasonable shape, is easy to process, and has low cost.

[0046] like Figures 3 to 5 As shown, the inner surface of the first control portion 221 is a planar first control surface 223, while the inner surface of the second control portion 222 forms a curved second control surface 224 and a cylindrical third control surface 225. When cut along the airflow direction, the second control surface 224 is curved, and the third control surface 225 is straight.

[0047] That is, the first control surface 223 is a two-dimensional plane, and the second control surface 224 and the third control surface 225 are three-dimensional curved surfaces. The first control surface 223, the second control surface 224, and the third control surface 225 are sequentially tangentially connected. Specifically, a circular intersection line is formed between the planar first control surface 223 and the spherical second control surface 224, and a circular intersection line is formed between the spherical second control surface 224 and the cylindrical third control surface 225.

[0048] To improve the stability of the rectifier under airflow impact, in this embodiment, the main rectifier net 1 and the rectifier 2 are coaxially arranged. The rectifier 2 is substantially aligned with the center of the impeller, which can optimize the airflow parameters at the central air inlet of the impeller and achieve a more significant noise reduction effect.

[0049] To reduce manufacturing difficulty, in this embodiment, the main rectifier mesh 1 and the rectifier component 2 can be separate structures. The separately processed main rectifier mesh 1 and rectifier component 2 are connected together by welding or other methods. It is understood that the main rectifier mesh 1 and rectifier component 2 can also be integrally formed by forging or other methods, which provides a more stable overall structure, high strength, and safer use.

[0050] The inner surface of the fairing 2 includes a first control surface 223, a second control surface 224, and a third control surface 225 connected in sequence. There are corresponding dimensional constraints between the first control surface 223, the second control surface 224, and the third control surface 225. Specifically, the distance between the impeller cap 3 and the first control surface 223 is L, the rotation radius of the impeller cap 3 around the axis OO is R1, and the distance between the intersection of the first control surface 223 and the second control surface 224 and the top center of the impeller cap 3 is S. The above three satisfy the relationship: S 2 >L 2 +R1 2 The minimum distance r between the impeller cap 3's rotation radius and the second control surface 224 is >8 mm. Assuming the wall thickness of the rectifier 2 is δ, the distance between the third control surface 225 and the impeller cap 3's rotation axis OO is R2, and the minimum distance between the main rectifier network 1 and the rotation axis OO is R3, these three factors satisfy the relationship: R3 - R2 - δ ≤ 2 mm. In other words, the distance H between the edge of the mounting hole 12 and the outer surface of the rectifier 2 is ≤ 2 mm.

[0051] The specific shape and location of the rectifying holes 21 on the rectifying element 2 are not limited, as long as they can improve the uniformity of the flow, reduce the vortex near the inlet center of the impeller cap 3, and reduce noise. The following describes five common ways to set the rectifying holes 21 on the rectifying element 2:

[0052] like Figure 6 and Figure 7 As shown, the rectifying holes 21 on the first control portion 221 are hexagonal, while the second control portion 222 is not perforated, with a porosity of 40% to 60%. The hexagonal holes have low wind resistance, which helps improve the flow uniformity of the intake air and reduce noise. The lack of holes on the side makes processing easier.

[0053] like Figure 8 As shown, the rectifying holes 21 on the first control part 221 and the second control part 222 are both strip-shaped holes. The first control part 221 and the second control part 222 respectively form a strip-shaped mesh structure, which has low wind resistance and low noise. It should be noted that the strip-shaped hole is a hole-like structure with a width significantly smaller than the length, and can also be called a waist-shaped hole or a rectangular hole. Along the airflow direction, the area of ​​the rectifying hole 21 gradually increases, while not affecting the air intake at the center of the motor impeller inlet, while increasing the opening area at the edge. The porosity is 60% to 70%, which improves the overall strength of the rectifying part 2.

[0054] like Figure 9As shown, both the first control unit 221 and the second control unit 222 include a longitudinal structure and a latitudinal structure formed by bending metal wire, such as iron wire. Specifically, the longitudinal structure includes at least two rings, and the latitudinal structure includes at least two arcs. The latitudinal structures are fixedly connected to the longitudinal structures to provide support for the longitudinal structures, forming a mesh structure. Airflow passing through the mesh improves flow uniformity and reduces noise. The porosity is 70% to 85%, which is relatively high, allowing for the rapid extraction of large amounts of oil smoke generated during stir-frying, improving the user experience. The continuous multi-level mesh significantly guides the oil smoke to reach the impeller cap 3 evenly, achieving high oil smoke removal efficiency.

[0055] like Figure 10 and Figure 11 As shown, the rectifying holes 21 on both the first control section 221 and the second control section 222 are hexagonal, with a porosity of 70% to 85%, ensuring a more uniform airflow through the mesh. Reinforcement ribs are formed between the staggered rectifying holes 21 on the second control section 222. These ribs serve to enhance the strength of the rectifying element 2 and to guide the airflow into the rectifying element 2, allowing it to freely diverge and cut the large vortex in front of the impeller cap 3. This results in excellent rectifying and noise reduction.

[0056] like Figure 12 and Figure 13 As shown, the rectifying holes 21 on the first control portion 221 are hexagonal, while the rectifying holes 21 on the second control portion 222 are symmetrically arranged strip holes with a porosity of 70%-85%, ensuring good airflow uniformity. The second control portion 222 can have a convex curved surface or a straight conical cylindrical structure, and their functions and effects are the same.

[0057] 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 device, characterized in that: include: A main rectifying net (1) is provided with ventilation holes (11) and mounting holes (12), and airflow can pass through the ventilation holes (11); and A rectifying member (2) is inserted into the mounting through hole (12), and the rectifying member (2) protrudes in a direction away from the impeller; at least two rectifying holes (21) are provided on the rectifying member (2), and the airflow reaches the impeller after being rectified through the rectifying holes (21).

2. The rectifier device according to claim 1, characterized in that The rectifying member (2) comprises a main body (22) and a mounting portion (23) connected to each other, the rectifying flow hole (21) is provided on the main body (22), and the mounting portion (23) is fixedly connected to the mounting through hole (12).

3. The rectifier device according to claim 2, characterized in that The main body (22) comprises a first control portion (221) and a second control portion (222) connected to each other. Along the airflow direction, the first control portion (221) is located at an upwind end compared to the second control portion (222).

4. The rectifier device according to claim 3, characterized in that The inner surface of the first control portion (221) is a planar first control surface (223), and the inner surface of the second control portion (222) forms a curved second control surface (224) and a third control surface (225). When a cross section is made along the airflow direction, the second control surface (224) is in an arc shape, and the third control surface (225) is in a straight line shape. The first control surface (223), the second control surface (224), and the third control surface (225) are sequentially tangently connected.

5. The rectifier device according to claim 3, characterized in that: The rectifying hole (21) on the first control part (221) is hexagonal and has a porosity of 40% to 60%; or, The rectifying holes (21) on the first control portion (221) and the second control portion (222) are both strip-shaped holes, and the area of ​​the rectifying holes (21) gradually increases along the airflow direction, with a porosity of 60% to 70%; or, The first control part (221) and the second control part (222) each include at least two annular longitude structures and at least two arc-shaped latitude structures bent from a metal wire, the longitude structures and the latitude structures are respectively fixedly connected, and the porosity is 70% to 85%; or, The rectifying holes (21) on the first control portion (221) and the second control portion (222) are both hexagonal, with a porosity of 70% to 85%, and reinforcing ribs are formed between the rectifying holes (21) arranged alternately on the second control portion (222); or, The rectifying holes (21) on the first control portion (221) are hexagonal, and the rectifying holes (21) on the second control portion (222) are strip-shaped, with a porosity of 70%-85%.

6. The rectifier device according to any one of claims 1 to 5, characterized in that: The main rectifying network (1) and the rectifying element (2) are coaxially arranged.

7. The rectifier device according to any one of claims 1 to 5, characterized in that: The distance H between the edge of the mounting through hole (12) and the outer surface of the rectifying component (2) is ≤ 2 mm.

8. A range hood comprising an impeller and a housing, characterized in that: The range hood further comprises a rectifying device according to any one of claims 1 to 7, wherein the rectifying device is connected to the housing, and along the airflow direction, the rectifying member (2) is located at the upwind end of the impeller.

9. The range hood according to claim 8, characterized in that: The inner surface of the fairing (2) comprises a first control surface (223), a second control surface (224) and a third control surface (225) connected in sequence; the impeller comprises an impeller cap (3); the distance between the impeller cap (3) and the first control surface (223) is L; the rotation radius of the impeller cap (3) is R1; the distance between the intersection of the first control surface (223) and the second control surface (224) and the top center of the impeller cap (3) is S; S 2 >L 2 +R1 2 .

10. The range hood according to claim 8, characterized in that: The inner surface of the fairing (2) includes a second control surface (224), the impeller includes an impeller cap (3), and the minimum value of the distance r between the impeller cap (3) and the second control surface (224) is greater than 8 mm.

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