Air outlet structure and range hood

Abstract

The invention relates to an air outlet structure and a range hood. The air outlet structure comprises a range hood body, a fan frame and an air outlet cover, the fan frame is fixed to the top of the range hood body, a volute is arranged in the range hood body, and part of the volute is located in the fan frame; the air outlet cover comprises at least two air outlet sections which are connected in sequence, the air outlet section with one end connected with the outlet of the volute is a first air outlet section, and the first air outlet section is fixed in the fan frame; in the air outlet direction of the air outlet cover, the width of each air outlet section in the Y-axis direction is gradually increased, and the center points of the openings of the air outlet sections sequentially deviate in the positive direction of the Y-axis; according to the range hood, the fan frame is additionally arranged, the overall size of the range hood is minimized on the premise that the installation requirement of a thin fan volute is met, and on the basis, the multi-section type air outlet cover with all the sections facing forwards in sequence (in the positive direction of the Y axis) is designed, so that interference between the air outlet cover and the wall face and the fan frame can be avoided, and meanwhile the service life of the range hood is prolonged. Noise is reduced as much as possible, and airflow fluency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to range hoods, and in particular to an air outlet structure and a range hood. Background Art

[0002] At present, the common styles of range hoods include European style, deep suction style, near suction style, side suction style, etc. After being installed on the wall, these styles of range hoods are too thick, which can easily squeeze the user's cooking space and block the user's sight, posing the risk of head collision;

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

[0004] However, the reduction in the thickness of the range hood is accompanied by a restriction on the thickness of the fan. In order to ensure the performance of the fan and the effect of extracting oil fumes, the size of the fan needs to be increased, which will lead to an increase in the size of the range hood. In addition, the traditional air outlet hood is large in size and may interfere with the front cover of the panel bracket when used in ultra-thin range hoods. If the structure of the air outlet hood is simply adaptively changed to make it suitable for ultra-thin range hoods, the air outlet resistance will increase, resulting in increased noise and affecting the smoothness of the airflow. Summary of the invention

[0005] Based on this, it is necessary to provide an air outlet structure and range hood that is smaller in size, can be suitable for ultra-thin range hoods, can reduce noise, and improve airflow smoothness, in order to address the problems that the existing ultra-thin range hoods are large in size and cannot be used with traditional air outlet hoods, and changing the air outlet hood structure will increase noise and affect the smoothness of airflow.

[0006] The present application first provides an air outlet structure, including a range hood body, a fan frame and an air outlet cover, wherein the fan frame is fixed to the top of the range hood body, a volute is arranged in the range hood body, and part of the volute is located in the fan frame;

[0007] The air outlet cover comprises at least two air outlet sections connected in sequence, wherein the air outlet section having one end connected to the volute outlet is a first air outlet section, and the first air outlet section is fixed in the fan frame;

[0008] 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 point of the opening of each air outlet section is offset in sequence along the positive direction of the Y-axis.

[0009] In one of the embodiments, the angle between the projection of the line between the center points of the two openings of each of the air outlet sections on the YOZ plane and the Z axis is equal to 15 degrees.

[0010] In one embodiment, the air outlet cover includes the first air outlet section and the second air outlet section connected in sequence, the opening of the first air outlet section connected to the volute outlet is the first air outlet, the opening connected to the second air outlet section is the second air outlet, and the opening of the second air outlet section connected to the exhaust pipe is the third air outlet;

[0011] The first air outlet and the second air outlet are square in shape, and the third air outlet is circular in shape.

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

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

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

[0015] In one of the embodiments, a connecting flange is fixed around one end of the first air outlet section near the volute, a first bolt hole is provided on the connecting flange, a bolt column is fixed to the side wall of the first air outlet section along the positive direction of the Y-axis, the bolt column is fixed to the connecting flange along the vertical direction, and a second bolt hole is provided on the inner wall of the first air outlet section along the vertical direction, which passes through the side wall of the first air outlet section, the bolt column and the connecting flange.

[0016] In one embodiment, along the air outlet direction of the air outlet cover, the length of the first air outlet section along the X-axis direction gradually increases, and the center point of each air outlet section opening is offset in sequence according to the inclination 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] The present application first provides a range hood, comprising the above-mentioned air outlet structure.

[0019] The above-mentioned air outlet structure, by adding a fan frame, minimizes the overall size of the range hood while meeting the installation requirements of a thin fan volute. On this basis, by designing a multi-stage air outlet hood with each stage facing forward (positive direction of the Y axis) in sequence, it is possible to reduce noise as much as possible and improve airflow smoothness while avoiding interference between the air outlet hood and the wall and the fan frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of the range hood of the present application;

[0021] Figure 2 for Figure 1 Sectional view along the left viewing direction;

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

[0023] Figure 4 for Figure 1 A cross-sectional view along the front view direction;

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

[0025] Figure 6 for Figure 1 A three-dimensional image with the hoarding hidden in the middle;

[0026] Figure 7 for Figure 6 A three-dimensional view of the center air hood after it is cut open along the left side and viewed from another angle.

[0027] Figure numerals: 100, range hood body; 110, volute; 200, fan frame; 210, enclosure; 220, fixing frame; 300, air outlet cover; 10, air outlet section; 11, first air outlet section; 111, connecting flange; 111a, first bolt hole; 112, bolt column; 112a, second bolt hole; 12, second air outlet section; 10a, first air outlet; 10b, second air outlet; 10c, third air outlet. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0029] 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 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

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

[0035] In the present application, by arranging the 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, so that after the size of the volute 110 of the thin fan is increased, the fan frame 200 only needs to be adaptively designed according to the size of the protruding part of the volute 110, and 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-section air outlet hood 300 and limiting the center point of the opening of each air outlet section 10 to be offset in sequence along the positive direction of the Y-axis, the air outlet hood 300 of the present application can meet the installation requirements (without interfering with the fan frame 200 and the range hood body 100) while minimizing performance losses.

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

[0038] In this regard, in the present application, a multi-stage air outlet hood 300 is designed so that each air outlet section 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, thereby ensuring that the air outlet hood 300 will not interfere with the fan frame 200 and the wall, thereby meeting the installation requirements of the air outlet hood 300 in the ultra-thin range hood.

[0039] On this basis, the present application limits the width of each air outlet section 10 along the Y-axis direction to gradually increase, and the center point of the opening of each air outlet section 10 is offset in sequence along the positive direction of the Y-axis. The former can ensure that the inner diameter of the air outlet cover 300 increases smoothly to match the exhaust pipe, increase the ventilation area to reduce the flow rate, and reduce noise;

[0040] The latter can reduce the airflow resistance and energy loss of eddies by controlling and optimizing the wall-attached flow guide. Specifically, since the air inlet is far away from the front and rear distance (distance along the Y-axis direction) of the center point of the oil smoke rising area, therefore, by shifting the center point of the opening of each air outlet section 10 in sequence along the positive direction of the Y-axis, combined with the characteristic of large air intake on the front side of the thin fan, the rear end air outlet resistance and the guiding flow effect can be reduced, so as to improve the flow state and reduce eddies, thereby achieving the effect of reducing noise and improving the smoothness of the airflow after entering the exhaust pipe.

[0041] It is worth mentioning that the velocity profile refers to the area near the solid surface where, due to the viscous effect, the velocity of the fluid gradually increases from zero (on the solid surface, assuming no slip conditions) to matching the mainstream velocity; and this velocity change area 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 area far away from the wall, inertial forces dominate.

[0042] To summarize, the air outlet mechanism of the present application, by adding a fan frame 200, minimizes the overall size of the range hood while meeting the installation requirements of the thin fan volute 110. On this basis, by designing a multi-stage air outlet hood 300 with each stage facing forward (positive direction of the Y axis) in sequence, it is possible to reduce noise as much as possible and improve airflow smoothness while avoiding interference between the air outlet hood 300 and the wall and the fan frame 200.

[0043] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the angle between the projection of the line between 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; for the convenience of description, the angle between the projection of the line between the center points of the two openings of each air outlet section 10 on the YOZ plane and the Z axis is defined as the first inclination angle.

[0044] Calculation and simulation experiments have shown that 15° is the maximum inclination angle measured by performance. Therefore, by controlling the first inclination angle of each air outlet section 10 between 0° and 15°, the air outlet resistance and the guiding flow effect at the rear end of the air outlet cover 300 can be effectively reduced to minimize noise and improve airflow smoothness.

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

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

[0047] Of course, the first inclination angles of the first air outlet section 11 and the second air outlet section 12 can also be adjusted according to actual parameters, as long as it is ensured that the first air outlet section 11 will not interfere with the fan rack 200 and the end of the air outlet cover 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 at the third air outlet 10c (i.e., the end of the air outlet cover 300 connected to the exhaust pipe) along the Y-axis direction is greater than 7.5 mm;

[0049] It is not difficult to understand that the smaller the distance between the two along the Y-axis direction, the smaller the protrusion of the air hood 300 along the Y-axis direction, and the smaller the space occupied by the range hood. On this basis, the distance is designed to be greater than 7.5mm, which can reserve connection and installation space for the air hood 300 and the exhaust pipe to facilitate tape winding, 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 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 outlet 10a and the second air outlet 10b are square, and the third air outlet 10c is circular.

[0051] Since the outlet of the fan is mostly rectangular and the inlet of the smoke exhaust pipe is mostly circular, the first air outlet 10a is designed to be square and the third air outlet 10c is designed to be circular, which can meet the connection requirements of most fans and smoke exhaust pipes and meet the flow diversion requirements in most cases;

[0052] On this basis, since the transition from square to circle will cause the air hood 300 to change shape suddenly 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 rack 200.

[0053] In some embodiments, considering stress intensity and strength, the square inner wall of the air outlet cover 300 is formed with chamfers.

[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, which structurally eliminates the possibility of interference between the second air outlet section 12 (square-to-circular 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, wherein S1 is the area of ​​the first air outlet 10a, and S2 is the area of ​​the second air outlet 10b. While avoiding interference between the first air outlet section 11 and the fan rack 200, the ventilation area is increased to reduce the flow rate and reduce noise.

[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 close to the volute 110, and a first bolt hole 111a is provided on the connecting flange 111. A bolt column 112 is fixed to the side wall of the first air outlet section 11 along the positive direction of the Y-axis, and the bolt column 112 is fixed to the connecting flange 111 along the vertical direction. A second bolt hole 112a is provided on the inner wall of the first air outlet section 11 along the vertical direction, which passes through the side wall of the first air outlet section 11, the bolt column 112 and the connecting flange 111.

[0057] Since the first air outlet section 11 is tilted forward along the Y-axis direction, the gap between the first air outlet section 11 and the front inner wall of the fan rack 200 will be smaller, and the front bolts cannot be installed. In the present application, a bolt column 112 is provided on the side wall of the first air outlet section 11 along the positive direction of the Y-axis, and a second bolt hole 112a is opened 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 rack 200 can be fully utilized to ensure that the front side of the first air outlet section 11 can also be pressed and fixed to the fan rack 200.

[0058] In some embodiments, the fan frame 200 includes a panel 210 and a fixing frame 220, wherein the panel 210 is fixed to the range hood body 100, the fixing frame 220 is fixed to the inner wall of the panel 210, and the first air outlet section 11 is fixed 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 cover 300, the length of the first air outlet section 11 along the X-axis direction gradually increases, and the center point of the opening of each air outlet section 10 is offset in sequence according to the inclination direction of the volute 110 outlet along the X-axis.

[0060] Sequentially offsetting the air outlet sections 10 of the air outlet hood 300 along the X-axis direction can, on the one hand, cooperate with the sequential offset of the air outlet sections 10 along the Y-axis direction to achieve double tilting, so that the inner wall of the air outlet hood 300 can better fit the flow direction of the oil smoke, reduce flow resistance, and improve the diversion effect; on the other hand, it can also adapt to the installation requirements in some cases where the space size is limited, thereby improving the space utilization rate 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 inclination angle according to the inclination angle of the outlet of the volute 110 along the X-axis. Preferably, the second inclination angle of each air outlet section 10 is less than 15°.

[0062] Calculation and simulation experiments have shown that 15° is the maximum inclination angle measured by performance. Therefore, by controlling the second inclination angle of each air outlet section 10 between 0° and 15°, the air outlet resistance and the guiding flow effect at the rear end of the air outlet cover 300 can be effectively reduced to minimize noise and improve airflow smoothness.

[0063] More preferably, the second inclination angles of the first air outlet section 11 and the second air outlet section 12 are both 5°.

[0064] Of course, the above-mentioned offset angle is an offset angle taken into consideration of commonly used molding processes. Without considering the difficulty and cost of production, the second inclination angles of the first air outlet section 11 and the second air outlet section 12 can also be adaptively adjusted according to the actual parameters such as the orientation and position of the volute 110, the smoke exhaust pipe and other structures to obtain a better diversion effect. The present application does not give examples one by 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 sudden change in cross-section between the outlet of the volute 110 and the inner wall of the first air outlet 10a, thereby improving the turbulence and flow loss inside the air outlet cover 300, thereby achieving the effect of improving the fan efficiency and reducing noise.

[0066] In some embodiments, the air outlet sections 10 are smoothly connected to each other to reduce the flow resistance of the oil smoke at the junction of the air outlet sections, thereby improving the diversion effect; further, the inner walls of each air outlet section 10 along the circumferential direction are smoothly connected, and the smooth connection between the air outlet sections 10 in the axial direction can reduce the flow loss caused by the sudden change of the inner wall surface of the air outlet cover 300, and better guide the airflow from the volute 110 into the smoke exhaust pipe from the three-dimensional design perspective, so as to improve the turbulence and flow loss inside the air outlet cover 300, thereby achieving the effect of improving the fan efficiency and reducing noise.

[0067] A second aspect of the present application provides a range hood comprising the above-mentioned air outlet structure.

[0068] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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 above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An air outlet structure, characterized in that: The range hood comprises a range hood body (100), a fan frame (200) and an air outlet cover (300), wherein the fan frame (200) is fixed to the top of the range hood body (100), a volute (110) is arranged in the range hood body (100), and a part of the volute (110) is located in the fan frame (200); The air outlet cover (300) comprises at least two air outlet sections (10) connected in sequence, wherein the air outlet section (10) having one end connected to the outlet of the volute (110) is a first air outlet section (11), and the first air outlet section (11) is fixed in the fan frame (200); Along the air outlet direction of the air outlet cover (300), the width of each air outlet section (10) along the Y-axis direction gradually increases, and the center point of the opening of each air outlet section (10) is offset in sequence along the positive direction of the Y-axis.

2. The air outlet structure according to claim 1, characterized in that: The angle between the projection of the line between 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 cover (300) comprises the first air outlet section (11) and the second air outlet section (12) which are 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 in shape, and the third air outlet (10c) is circular in shape.

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

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

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

7. The air outlet structure according to claim 3, characterized in that: A connecting flange (111) is fixed around one end of the first air outlet section (11) close to the volute (110), and a first bolt hole (111a) is provided on the connecting flange (111). A bolt column (112) is fixed to the side wall of the first air outlet section (11) along the positive direction of the Y axis, and the bolt column (112) is fixed to the connecting flange (111) along the vertical direction. A second bolt hole (112a) is provided on the inner wall of the first air outlet section (11) along the vertical direction and passes through the side wall of the first air outlet section (11), the bolt column (112) and the connecting flange (111).

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

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: It comprises the air outlet structure as described in any one of claims 1 to 9.

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