Air outlet structure and range hood

Abstract

The application relates to an air outlet structure and an extractor hood. The air outlet structure comprises an extractor hood body, a fan frame and an air outlet cover. The fan frame is fixed to the top of the extractor hood body. A volute is arranged in the extractor hood body, and part of the volute is located in the fan frame. The air outlet cover comprises at least two air outlet sections connected in sequence. One end of the air outlet section connected with the outlet of the volute is the first air outlet section, and the first air outlet section is fixed in the fan frame. Along the air outlet direction of the air outlet cover, the width of each air outlet section along the Y-axis direction gradually increases, and the center points of the openings of the air outlet sections are sequentially offset along the positive direction of the Y-axis. By adding the fan frame, the overall size of the extractor hood is minimized under the premise of meeting the installation requirements of the thin fan volute. On this basis, by designing the multi-section air outlet cover which is sequentially forward (the positive direction of the Y-axis), the interference between the air outlet cover and the wall surface and the fan frame can be avoided, noise can be reduced as much as possible, and the airflow smoothness can be improved.

Description

Technical Field

[0001] This invention relates to the technical field of range hoods, and in particular to an air outlet structure and a range hood. Background Technology

[0002] Currently, common range hood styles include European style, deep suction, near suction, and side suction. When these types of range hoods are installed on the wall, their thickness can easily encroach on the user's cooking space and obstruct the user's view, posing a risk of bumping one's head.

[0003] As users pursue space utilization and aesthetics, ultra-thin range hoods, which are thinner than traditional range hoods, are gradually becoming the mainstream trend. They have a smaller front and back depth, a more beautiful appearance, and take up less cabinet space.

[0004] However, the reduction in the thickness of range hoods comes with limitations on the thickness of the fan. To ensure fan performance and smoke extraction efficiency, the fan size needs to be increased, which in turn leads to an increase in the size of the range hood. In addition, the traditional exhaust hood is relatively large, which may interfere with the front cover of the panel bracket when applied to ultra-thin range hoods. If the exhaust hood structure is simply modified to fit ultra-thin range hoods, it will increase the airflow resistance, resulting in increased noise and problems affecting airflow smoothness. Summary of the Invention

[0005] Therefore, it is necessary to address the issues that existing ultra-thin range hoods are too large to be used with traditional exhaust hoods, and that changing the exhaust hood structure would lead to increased noise and affect airflow smoothness. The goal is to provide a smaller exhaust structure and range hood that can be used with ultra-thin range hoods, while reducing noise and improving airflow smoothness.

[0006] This application first provides an air outlet structure, including a range hood body, a fan frame and an air outlet hood, wherein the fan frame is fixed to the top of the range hood body, and a volute is provided inside the range hood body, with part of the volute located inside the fan frame;

[0007] The air outlet hood includes at least two air outlet sections connected in sequence, wherein the air outlet section connected at one end to the outlet of the volute is the first air outlet section, and the first air outlet section is fixed inside the fan frame;

[0008] Along the air outlet direction of the air outlet hood, the width of each air outlet section gradually increases along the Y-axis, and the center point of the opening of each air outlet section shifts sequentially along the positive Y-axis.

[0009] In one embodiment, the angle between the projection of the line connecting the center points of the two openings of each air outlet section onto the YOZ plane and the Z-axis is equal to 15 degrees.

[0010] In one embodiment, the air hood includes a first air outlet section and a second air outlet section connected in sequence. The opening of the first air outlet section connected to the volute outlet is a first air vent, the opening connected to the second air outlet section is a second air vent, and the opening of the second air outlet section connected to the exhaust pipe is a third air vent.

[0011] The first and second air vents are square, and the third air vent is circular.

[0012] In one embodiment, the second air vent protrudes upward from the fan frame.

[0013] In one embodiment, 1 < S2 / S1 < 1.1, where S1 is the area of ​​the first air vent and S2 is the area of ​​the second air vent.

[0014] In one embodiment, the distance between the back of the range hood body and the second air outlet section at the third air vent along the Y-axis is greater than 7.5 mm.

[0015] In one embodiment, a connecting flange is fixed around one end of the first air outlet section near the volute, and a first bolt hole is provided on the connecting flange. A bolt post is fixed to the side wall of the first air outlet section along the positive Y-axis, and the bolt post is fixed to the connecting flange in the vertical direction. A second bolt hole is provided on the inner wall of the first air outlet section in the vertical direction, penetrating the side wall of the first air outlet section, the bolt post, and the connecting flange.

[0016] In one embodiment, along the air outlet direction of the air outlet hood, the length of the first air outlet section gradually increases along the X-axis, and the center point of the opening of each air outlet section is shifted sequentially according to the tilt direction of the volute outlet along the X-axis.

[0017] In one embodiment, the first air outlet section is tangent to the volute outlet.

[0018] This application first provides a range hood, including the above-mentioned air outlet structure.

[0019] The above-mentioned air outlet structure minimizes the overall size of the range hood by adding a fan frame, while meeting the installation requirements of the thin fan casing. On this basis, by designing a multi-segment air outlet hood with each segment facing forward sequentially (positive Y-axis direction), it can avoid interference between the air outlet hood and the wall and the fan frame, while minimizing noise and improving airflow smoothness. Attached Figure Description

[0020] Figure 1 This is a perspective view of the range hood used in this application;

[0021] Figure 2 for Figure 1 A cross-sectional view along the left-side view;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 for Figure 1 A sectional view along the frontal viewing direction;

[0024] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0025] Figure 6 for Figure 1 A 3D view of what's behind the hidden panel;

[0026] Figure 7 for Figure 6 A three-dimensional view of the center exhaust shroud cut open along the left-hand view from another angle.

[0027] Reference numerals: 100, main body of the range hood; 110, volute; 200, fan frame; 210, enclosure; 220, mounting bracket; 300, exhaust hood; 10, exhaust section; 11, first exhaust section; 111, connecting flange; 111a, first bolt hole; 112, bolt post; 112a, second bolt hole; 12, second exhaust section; 10a, first air outlet; 10b, second air outlet; 10c, third air outlet. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening 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 possible implementation.

[0034] Please combine Figure 1 , Figure 2 as well as Figure 3As shown, this application first provides an air outlet structure, including a range hood body 100, a fan frame 200, and an air outlet hood 300. The fan frame 200 is fixed to the top of the range hood body 100, and a volute 110 is provided inside the range hood body 100, with a portion of the volute 110 located inside the fan frame 200. The air outlet hood 300 includes at least two air outlet sections 10 connected in sequence, wherein one end of the air outlet section 10 connected to the outlet of the volute 110 is the first air outlet section 11, and the first air outlet section 11 is fixed inside the fan frame 200. Along the air outlet direction of the air outlet hood 300, the width of each air outlet section 10 gradually increases along the Y-axis direction, and the center point of the opening of each air outlet section 10 is successively offset along the positive Y-axis direction.

[0035] In this application, by setting a fan frame 200 on the top of the range hood body 100, the fan frame 200 can be used to accommodate part of the volute 110. This allows the fan frame 200 to be designed adaptively according to the size of the protruding part of the volute 110 after the size of the thin fan volute 110 is increased. The installation requirements of the volute 110 and other components can be met without increasing the size of the range hood body 100, thereby minimizing the overall size of the range hood.

[0036] Secondly, by designing a multi-segment air outlet hood 300 and limiting the center point of the opening of each air outlet segment 10 to shift sequentially along the positive Y-axis, the air outlet hood 300 of this application can minimize performance loss while meeting installation requirements (without interfering with the fan frame 200 and the range hood body 100).

[0037] In addition, for ultra-thin range hoods, the exhaust pipe is larger than the thickness of the range hood body 100. Therefore, the connection end between the exhaust hood 300 and the exhaust pipe must be offset or tilted in the positive Y-axis direction to prevent the exhaust pipe from interfering with the wall behind the range hood body 100. However, if the exhaust hood 300 is offset or tilted excessively, it may cause interference between the exhaust hood 300 and the fan frame 200.

[0038] In this application, a multi-segment air outlet hood 300 is designed so that each air outlet segment 10 can be independently designed according to actual parameters such as the size of the fan frame 200, the size of the exhaust pipe, and the distance from the wall. This ensures that the air outlet hood 300 will not interfere with the fan frame 200 or the wall, thus meeting the installation requirements of the air outlet hood 300 in the ultra-thin range hood.

[0039] Based on this, in this application, the width of each air outlet section 10 is gradually increased along the Y-axis direction, and the center point of the opening of each air outlet section 10 is shifted sequentially along the positive Y-axis direction. The former can ensure that the inner diameter of the air outlet hood 300 is smoothly increased to match the exhaust pipe, increase the ventilation area to reduce the flow rate and reduce noise.

[0040] The latter can reduce airflow resistance and vortex energy loss by controlling and optimizing the wall-mounted flow. Specifically, since the distance between the air inlet and the center point of the fume rising area (distance along the Y-axis) is relatively far, by shifting the center point of each air outlet section 10 opening sequentially along the positive Y-axis, combined with the large air intake volume at the front of the thin fan, the rear air outlet resistance and guiding effect can be reduced, thereby improving the flow state and reducing vortices, achieving the effect of reducing noise and improving the smoothness of airflow after entering the exhaust pipe.

[0041] It is worth mentioning that the velocity profile refers to the region near the solid surface where, due to the viscous effect, the fluid velocity gradually increases from zero (on the solid surface, assuming no slip conditions) to match the mainstream velocity; and this region of velocity change is called the wall layer or boundary layer; the viscous effect means that the flow in the wall layer is mainly affected by viscous forces, while in the mainstream region far from the wall, inertial forces dominate.

[0042] In summary, the air outlet mechanism of this application minimizes the overall size of the range hood by adding a fan frame 200 while meeting the installation requirements of the thin fan casing 110. On this basis, by designing a multi-segment air outlet hood 300 with each segment facing forward sequentially (positive Y-axis direction), it is possible to avoid interference between the air outlet hood 300 and the wall and the fan frame 200, while minimizing noise and improving airflow smoothness.

[0043] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the angle between the projection of the line connecting the center points of the two openings of each air outlet section 10 onto the YOZ plane and the Z-axis is equal to 15 degrees; for ease of description, the angle between the projection of the line connecting the center points of the two openings of each air outlet section 10 onto the YOZ plane and the Z-axis is defined as the first tilt angle.

[0044] Through calculation and simulation experiments, it was found that 15° is the maximum tilt angle measured for performance. Therefore, by controlling the first tilt angle of each air outlet section 10 between 0° and 15°, the air outlet resistance at the rear end of the air outlet hood 300 and the guiding effect can be effectively reduced, so as to minimize noise and improve airflow smoothness.

[0045] Preferably, in some embodiments, the first tilt angle of the first air outlet section 11 is smaller than the first tilt angle of the second air outlet section 12.

[0046] More preferably, in some embodiments, the first tilt angle of the first air outlet section 11 is 7°, and the first tilt angle of the second air outlet section 12 is 11°.

[0047] Of course, the first tilt angle of the first air outlet section 11 and the second air outlet section 12 can also be adjusted according to the actual parameters, as long as it is ensured that the first air outlet section 11 will not interfere with the fan frame 200 and that the end of the air outlet hood 300 connected to the exhaust pipe is as close to the wall as possible without interfering with the wall.

[0048] Specifically, in some embodiments, the distance between the back of the range hood body 100 and the second air outlet section 12 (i.e. the end where the air outlet hood 300 is connected to the exhaust pipe) at the third air outlet 10c is greater than 7.5mm along the Y-axis.

[0049] It is easy to understand that the smaller the distance between the two along the Y-axis, the smaller the outward protrusion of the exhaust hood 300 along the Y-axis, and the smaller the space occupied by the range hood. On this basis, designing the distance to be greater than 7.5mm can reserve space for the connection and installation of the exhaust hood 300 and the exhaust pipe, so as to facilitate the wrapping of tape, etc.

[0050] Please combine Figure 3 as well as Figure 6 As shown, in some embodiments, the air outlet hood 300 includes a first air outlet section 11 and a second air outlet section 12 connected in sequence. The opening of the first air outlet section 11 connected to the outlet of the volute 110 is the first air outlet 10a, the opening connected to the second air outlet section 12 is the second air outlet 10b, and the opening of the second air outlet section 12 connected to the exhaust pipe is the third air outlet 10c. The first air outlet 10a and the second air outlet 10b are square, and the third air outlet 10c is circular.

[0051] Since most fan outlets are rectangular and most smoke exhaust pipe inlets are circular, the first air outlet 10a is designed as square and the third air outlet 10c is designed as circular. This can meet the connection requirements of most fans and smoke exhaust pipes and meet the airflow requirements in most cases.

[0052] Based on this, since the transition from square to circle will cause the shape of the exhaust hood 300 to change abruptly and increase in size, the second air outlet 10b is also designed to be square to prevent the size of the first air outlet section 11 from changing too much and to minimize the possibility of interference between the first air outlet section 11 and the fan frame 200.

[0053] In some embodiments, the square inner wall of the air hood 300 is chamfered to take into account stress intensity and strength.

[0054] Please combine Figure 1 , Figure 2 as well as Figure 3 As shown, in some embodiments, the second air outlet 10b protrudes upward from the fan frame 200, structurally eliminating the possibility of interference between the second air outlet section 12 (square to round section) and the fan frame 200, thereby facilitating the size and structural design of the second air outlet section 12.

[0055] In some embodiments, 1 < S2 / S1 < 1.1, where S1 is the area of ​​the first air outlet 10a and S2 is the area of ​​the second air outlet 10b. This increases the ventilation area to reduce airflow velocity and noise while avoiding interference between the first air outlet section 11 and the fan frame 200.

[0056] Please combine Figure 6 as well as Figure 7 As shown, in some embodiments, a connecting flange 111 is fixed around one end of the first air outlet section 11 near the volute 110. A first bolt hole 111a is provided on the connecting flange 111. A bolt post 112 is fixed on the side wall of the first air outlet section 11 along the positive Y-axis. The bolt post 112 is fixed to the connecting flange 111 in the vertical direction. A second bolt hole 112a is provided on the inner wall of the first air outlet section 11 in the vertical direction, which passes through the side wall of the first air outlet section 11, the bolt post 112, and the connecting flange 111.

[0057] Because the first air outlet section 11 is tilted forward along the Y-axis, the gap between the first air outlet section 11 and the front inner wall of the fan frame 200 is small, making it impossible to install the front bolts. However, in this application, by setting bolt posts 112 on the side wall of the first air outlet section 11 along the positive Y-axis and opening a second bolt hole 112a in the vertical direction on the inner wall of the first air outlet section 11, the gap space between the first air outlet section 11 and the front inner wall of the fan frame 200 can be fully utilized to ensure that the front side of the first air outlet section 11 can also be pressed and fixed with the fan frame 200.

[0058] In some embodiments, the fan frame 200 includes a surrounding plate 210 and a fixing frame 220, wherein the surrounding plate 210 is fixed to the range hood body 100, the fixing frame 220 is fixed to the inner wall of the surrounding plate 210, and the first air outlet section 11 is bolted to the fixing frame 220 through the first bolt hole 111a and the second bolt hole 112a.

[0059] Please combine Figure 4 as well as Figure 5 As shown, in some embodiments, along the air outlet direction of the air outlet hood 300, the length of the first air outlet section 11 gradually increases along the X-axis, and the center point of the opening of each air outlet section 10 is shifted sequentially along the inclined direction of the outlet of the volute 110 along the X-axis.

[0060] By sequentially offsetting each air outlet section 10 of the air outlet hood 300 along the X-axis, on the one hand, it can coordinate with the sequential offset of each air outlet section 10 along the Y-axis to achieve a double tilting and deflection, so that the inner wall of the air outlet hood 300 can better conform to the flow direction of the oil fumes, reduce flow resistance, and improve the guiding effect; on the other hand, it can also adapt to the installation requirements in some space-constrained situations and improve the space utilization of the equipment.

[0061] For ease of description, the center point of the opening of each air outlet section 10 is defined as the second tilt angle according to the tilt angle of the outlet of the volute 110 along the X-axis. Preferably, the second tilt angle of each air outlet section 10 is less than 15°.

[0062] Through calculation and simulation experiments, it was found that 15° is the maximum tilt angle measured for performance. Therefore, by controlling the second tilt angle of each air outlet section 10 between 0° and 15°, the air outlet resistance at the rear end of the air outlet hood 300 and the guiding effect can be effectively reduced, so as to minimize noise and improve airflow smoothness.

[0063] More preferably, the second tilt angle of both the first air outlet section 11 and the second air outlet section 12 is 5°.

[0064] Of course, the above-mentioned offset angle is the offset angle adopted with consideration of commonly used molding processes. Without considering the production difficulty and cost, the second tilt angle of the first air outlet section 11 and the second air outlet section 12 can also be adaptively adjusted according to the different actual parameters such as the orientation and position of the volute 110, the smoke exhaust pipe and other structures, so as to obtain a better air guiding effect. This application will not give examples of each one here.

[0065] Please combine Figure 4 as well as Figure 5 As shown, in some embodiments, the first air outlet section 11 is tangent to the outlet of the volute 110 to reduce the flow loss caused by the abrupt change in cross-section between the outlet of the volute 110 and the inner wall of the first air inlet 10a, thereby improving the turbulence and flow loss inside the air outlet shroud 300 and achieving the effect of improving fan efficiency and reducing noise.

[0066] In some embodiments, the air outlet sections 10 are smoothly connected to reduce the flow resistance of oil fumes at the junction of the air outlet sections, thereby improving the guiding effect. Furthermore, the inner walls of each air outlet section 10 are smoothly connected in the circumferential direction, which, together with the smooth connection in the axial direction between the air outlet sections 10, can reduce the flow loss caused by the abrupt change in the inner wall surface of the air outlet hood 300. From the perspective of three-dimensional design, the airflow is better guided from the volute 110 into the exhaust pipe, thereby improving the turbulence and flow loss inside the air outlet hood 300, and achieving the effect of improving fan efficiency and reducing noise.

[0067] A second aspect of this application provides a range hood, including the aforementioned air outlet structure.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An air outlet structure, characterized in that, The range hood includes a main body (100), a fan frame (200), and an exhaust hood (300). The fan frame (200) is fixed to the top of the main body (100). A volute (110) is provided inside the main body (100), and part of the volute (110) is located inside the fan frame (200). The air outlet hood (300) includes at least two air outlet sections (10) connected in sequence, wherein one end of the air outlet section (10) is connected to the outlet of the volute (110) and is the first air outlet section (11), and the first air outlet section (11) is fixed inside the fan frame (200); Along the air outlet direction of the air outlet hood (300), the width of each air outlet section (10) gradually increases along the Y-axis direction, and the center point of the opening of each air outlet section (10) shifts sequentially along the positive Y-axis direction. Wherein, the Y-axis direction is the depth direction of the air outlet structure, the X-axis direction is the width direction of the air outlet structure, the Z-axis direction is the height direction of the air outlet structure, and the Y-axis, X-axis and Z-axis directions are perpendicular to each other.

2. The air outlet structure according to claim 1, characterized in that, The angle between the projection of the line connecting the center points of the two openings of each air outlet section (10) on the YOZ plane and the Z axis is equal to 15 degrees.

3. The air outlet structure according to claim 1, characterized in that, The air outlet hood (300) includes a first air outlet section (11) and a second air outlet section (12) connected in sequence. The opening of the first air outlet section (11) connected to the outlet of the volute (110) is a first air outlet (10a), the opening connected to the second air outlet section (12) is a second air outlet (10b), and the opening of the second air outlet section (12) connected to the exhaust pipe is a third air outlet (10c). The first air vent (10a) and the second air vent (10b) are square, and the third air vent (10c) is circular.

4. The air outlet structure according to claim 3, characterized in that, The second air outlet (10b) protrudes upward from the fan frame (200).

5. The air outlet structure according to claim 3, characterized in that, 1 < S2 / S1 < 1.1, where S1 is the area of ​​the first air vent (10a) and S2 is the area of ​​the second air vent (10b).

6. The air outlet structure according to claim 3, characterized in that, The distance between the back of the main body (100) of the range hood and the second air outlet section (12) at the third air outlet (10c) along the Y-axis is greater than 7.5 mm.

7. The air outlet structure according to claim 3, characterized in that, The first air outlet section (11) is surrounded and fixed with a connecting flange (111) at one end near the volute (110). The connecting flange (111) has a first bolt hole (111a). The first air outlet section (11) has a bolt post (112) fixed on its side wall along the positive Y-axis. The bolt post (112) is fixed to the connecting flange (111) in the vertical direction. The inner wall of the first air outlet section (11) has a second bolt hole (112a) that passes through the side wall of the first air outlet section (11), the bolt post (112), and the connecting flange (111) in the vertical direction.

8. The air outlet structure according to claim 1, characterized in that, Along the air outlet direction of the air outlet hood (300), the length of the first air outlet section (11) gradually increases along the X-axis, and the center point of the opening of each air outlet section (10) is shifted sequentially along the inclined direction of the X-axis of the outlet of the volute (110).

9. The air outlet structure according to claim 8, characterized in that, The first air outlet section (11) is tangent to the outlet of the volute (110).

10. A range hood, characterized in that, Includes the air outlet structure as described in any one of claims 1 to 9.

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