Air outlet cover and range hood
By designing the air hood into a three-section structure, with the first air outlet section tangent to the volute outlet and the third air outlet section tangent to the exhaust pipe inlet, the problem of poor airflow guidance is solved, achieving more efficient fume emission and noise reduction.
Patent Information
- Application Number
- CN202520220200.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2035-02-12
AI Technical Summary
The existing exhaust hood has upright areas on the inner wall of the hood and the base of the exhaust hood, which results in poor airflow, high flow resistance, increased noise, and reduced smoke extraction efficiency of the range hood.
Design an air outlet hood that divides the air outlet cavity into three sections along the axial direction. The first air outlet section is tangent to the outlet of the volute, the third air outlet section is tangent to the inlet of the smoke exhaust pipe, and the second air outlet section is tangent to both. The design adopts a square-to-round structure to reduce flow resistance and improve the air guiding effect.
The three-section design reduces flow separation and flow resistance, improves airflow guidance, reduces noise, and enhances the smoke extraction efficiency of the range hood.
Smart Images
Figure CN223596021U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of range hoods, and in particular to an exhaust hood and a range hood. Background Technology
[0002] The exhaust hood of a range hood is used to connect the outlet of the fan system (i.e., the volute outlet) to the exhaust pipe. The fumes are discharged to the public flue or outdoors through the fan system volute, exhaust hood, and exhaust pipe.
[0003] To achieve the airflow guiding effect, current air outlet covers typically have an inclined section on the inner wall of the cover, which corresponds to the inclined direction of the inner wall of the volute and the corresponding area of the volute tongue and forms a certain angle.
[0004] However, even with an inclined exhaust hood, there are still vertical areas on the inner wall of the hood and the base of the exhaust hood. The flat inner wall cannot achieve a good airflow guiding effect, the flow resistance is relatively large, and flow separation and vortex will occur at the wall connection, resulting in increased noise and reduced smoke extraction efficiency of the range hood. There is still room for improvement. Utility Model Content
[0005] Therefore, it is necessary to address the issue that the current exhaust hoods still have upright areas on the inner wall of the hood and the base of the exhaust hood, resulting in relatively poor airflow guiding effect. A better solution would be to provide an exhaust hood and range hood that can further reduce the resistance to oil fume flow and improve the airflow guiding effect.
[0006] This application first provides an air outlet cover, including an integrally fixed cover body, a bottom connecting seat and a top connecting seat, the top connecting seat being located at the top of the cover body and the bottom connecting seat being located at the bottom of the cover body; the air outlet cover has an air outlet cavity that passes through the top connecting seat, the cover body and the bottom connecting seat, and the air outlet cavity is divided into a first air outlet section, a second air outlet section and a third air outlet section in sequence along the axial direction;
[0007] The first air outlet section corresponds to the bottom connecting seat and its inner wall is tangent to the volute outlet. The third air outlet section corresponds to the top connecting seat and its inner wall is tangent to the smoke exhaust pipe inlet. The second air outlet section corresponds to the cover and its two ends are tangent to the first air outlet section and the third air outlet section, respectively.
[0008] In one embodiment, the openings at both ends of the first air outlet section along the axial direction are square, and the openings at both ends of the third air outlet section along the axial direction are circular.
[0009] In one embodiment, the first air outlet section is divided into four first inner surfaces along the circumferential direction, and the second air outlet section is divided into four second inner surfaces along the circumferential direction. The first inner surfaces and the second inner surfaces correspond one-to-one and are smoothly connected along the axial direction.
[0010] In one embodiment, the wall surface of the first air outlet section is tangent to the wall surface corresponding to the volute outlet.
[0011] In one embodiment, the planes containing the openings on both sides of the second air outlet section are parallel to each other.
[0012] In one embodiment, the height of the first air outlet section is the same as that of the bottom connecting seat, ranging from 5mm to 15mm.
[0013] In one embodiment, the height of the third air outlet section ranges from 0.5 mm to 5 mm.
[0014] In one embodiment, the center point of the first air outlet section away from the side opening of the second air outlet section and the center point of the third air outlet section away from the side opening of the second air outlet section are offset along the width direction of the opening of the first air outlet section.
[0015] In one embodiment, the offset distance between the center point of the first air outlet section away from the side opening of the second air outlet section and the center point of the third air outlet section away from the side opening of the second air outlet section is 15mm to 35mm.
[0016] A second aspect of this application provides a range hood, including the aforementioned exhaust hood.
[0017] The aforementioned air outlet hood divides the air outlet cavity into three sections along the axial direction. The inner wall of the first air outlet section is tangent to the outlet of the volute, thus making the first air outlet section a continuation of the outlet wall of the volute and reducing the flow separation phenomenon caused by the change of the wall cross section. Similarly, the inner wall of the third air outlet section being tangent to the inner wall of the exhaust pipe inlet can also achieve the same effect. The two ends of the second air outlet section are tangent to the first air outlet section and the third air outlet section respectively, which can smoothly connect the first air outlet section and the third air outlet section, thereby reducing the flow resistance of oil fumes at the junction of each air outlet section and improving the guiding effect. Attached Figure Description
[0018] Figure 1 This is a perspective view of the air outlet cover of this application;
[0019] Figure 2 for Figure 1 A cross-sectional view of the center exhaust hood body along the frontal view direction;
[0020] Figure 3 for Figure 1 A top view of the center exhaust shroud.
[0021] Reference numerals: 10, cover; 20, bottom connecting seat; 30, top connecting seat; 40, air outlet cavity; 41, first air outlet section; 42, second air outlet section; 43, third air outlet section. Detailed Implementation
[0022] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model 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 full understanding of this utility model. However, this utility model can be implemented 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 this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model.
[0024] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 utility model according to the specific circumstances.
[0026] In this utility model, 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," "on top of," and "over" 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.
[0027] 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.
[0028] Please combine Figure 1 as well as Figure 2 As shown, this application first provides an air outlet hood, including an integrally fixed hood body 10, a bottom connecting seat 20, and a top connecting seat 30. The top connecting seat 30 is located at the top of the hood body 10, and the bottom connecting seat 20 is located at the bottom of the hood body 10. An air outlet cavity 40 is provided inside the air outlet hood, which passes through the top connecting seat 30, the hood body 10, and the bottom connecting seat 20. The air outlet cavity 40 is divided into a first air outlet section 41, a second air outlet section 42, and a third air outlet section 43 in sequence along the axial direction. The first air outlet section 41 corresponds to the bottom connecting seat 20 and its inner wall is tangent to the volute outlet. The third air outlet section 43 corresponds to the top connecting seat 30 and its inner wall is tangent to the exhaust pipe inlet. The second air outlet section 42 corresponds to the hood body 10 and its two ends are tangent to the first air outlet section 41 and the third air outlet section 43, respectively.
[0029] In this application, the air outlet cavity 40 is divided into three sections along the axial direction. The inner wall of the first air outlet section 41 is tangent to the outlet of the volute, thus making the first air outlet section 41 a continuation of the outlet wall of the volute, reducing the flow separation phenomenon caused by the change of the wall cross section. Similarly, the inner wall of the third air outlet section 43 being tangent to the inner wall of the exhaust pipe inlet can also achieve the same effect. The two ends of the second air outlet section 42 are tangent to the first air outlet section 41 and the third air outlet section 43 respectively, which can smoothly connect the first air outlet section 41 and the third air outlet section 43, thereby reducing the flow resistance of oil fumes at the junction of each air outlet section and improving the guiding effect.
[0030] Specifically, the air hood also includes a sealing gasket, which is fixed to the bottom of the bottom connecting seat 20.
[0031] It should be noted that the tangency mentioned in this application can also refer to coplanarity.
[0032] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the openings at both ends of the first air outlet section 41 along the axial direction are square, and the openings at both ends of the third air outlet section 43 along the axial direction are circular.
[0033] Since the outlet of the volute is mostly rectangular and the inlet of the exhaust pipe is mostly circular, the two openings of the air outlet cavity 40 are designed as square-to-round structures, which can meet the connection requirements of most volutes and exhaust pipes and meet the airflow requirements in most cases.
[0034] In some embodiments, the square inner walls are chamfered to take into account stress intensity and strength.
[0035] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the first air outlet section 41 is divided into four first inner surfaces along the circumferential direction, and the second air outlet section 42 is divided into four second inner surfaces along the circumferential direction. The first inner surfaces and the second inner surfaces correspond one-to-one and are smoothly connected along the axial direction. Both the first inner surfaces and the second inner surfaces are smooth planes or curved surfaces.
[0036] The two adjacent inner surfaces are smoothly connected in the circumferential direction. Together with the second air outlet section 42, the first air outlet section 41 and the third air outlet section 43 are smoothly connected in the axial direction. This can reduce the flow loss caused by the abrupt change in the cross-section of the wall of the air outlet cavity 40. From the perspective of three-dimensional design, it can better guide the airflow from the volute into the exhaust pipe, so as to improve the turbulence and flow loss inside the air outlet cavity 40, thereby improving the efficiency of the fan and reducing noise.
[0037] In some embodiments, the first air outlet section 41 is tangent to the wall surface corresponding to the volute outlet.
[0038] Specifically, the inclination angles of the four walls of the first air outlet section 41 correspond to the angles of the four walls at the outlet of the volute; more specifically, the inclination angles of the four walls of the third air outlet section 43 are determined according to the profile of different volutes and the inclination angles of the front and rear covers.
[0039] Please refer to Figure 2 As shown, in some embodiments, the planes containing the openings on both sides of the second air outlet section 42 are parallel to each other.
[0040] For ease of description, all heights in this application refer to the height perpendicular to the horizontal plane.
[0041] In some embodiments, the height of the first air outlet section 41 is the same as that of the bottom connecting seat 20, ranging from 5mm to 15mm.
[0042] In some embodiments, the height of the third air outlet section 43 ranges from 0.5 mm to 5 mm.
[0043] Of course, in some other embodiments, the heights of the first air outlet section 41 and the third air outlet section 43 can also be adjusted adaptively according to the actual part size, as long as they can meet the requirements of tangency with the volute outlet and the top connecting seat 30.
[0044] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the center point of the opening of the first air outlet section 41 away from the second air outlet section 42 and the center point of the opening of the third air outlet section 43 away from the second air outlet section 42 are offset along the width direction of the opening of the first air outlet section 41.
[0045] By designing the openings on both sides of the two second air outlet sections 42 eccentrically, that is, by designing the first air outlet section 41 and the third air outlet section 43 eccentrically, on the one hand, it can better fit 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.
[0046] In some embodiments, the offset distance between the center point of the opening of the first air outlet section 41 away from the second air outlet section 42 and the center point of the opening of the third air outlet section 43 away from the second air outlet section 42 is 15mm to 35mm. This offset range is taken into account the offset range adopted by commonly used molding processes. Without considering the production difficulty and cost, the offset distance between the center points of the two openings of the second air outlet section 42 can also be adaptively adjusted according to the different actual parameters such as the orientation and position of the volute, exhaust pipe and other structures to obtain a better air guiding effect. This application will not give examples of each one.
[0047] A second aspect of this application provides a range hood, including the aforementioned exhaust hood.
[0048] 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.
[0049] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. An air outlet cover, characterized in that, It includes an integrally fixed cover (10), a bottom connecting seat (20) and a top connecting seat (30), wherein the top connecting seat (30) is located at the top of the cover (10) and the bottom connecting seat (20) is located at the bottom of the cover (10); The air outlet hood has an air outlet cavity (40) that passes through the top connecting seat (30), the cover body (10) and the bottom connecting seat (20). The air outlet cavity (40) is divided into a first air outlet section (41), a second air outlet section (42) and a third air outlet section (43) in sequence along the axial direction. The first air outlet section (41) corresponds to the bottom connecting seat (20) and its inner wall is tangent to the volute outlet. The third air outlet section (43) corresponds to the top connecting seat (30) and its inner wall is tangent to the smoke exhaust pipe inlet. The second air outlet section (42) corresponds to the cover (10) and its two ends are tangent to the first air outlet section (41) and the third air outlet section (43) respectively.
2. The air outlet hood according to claim 1, characterized in that, The openings at both ends of the first air outlet section (41) along the axial direction are square, and the openings at both ends of the third air outlet section (43) along the axial direction are circular.
3. The air outlet hood according to claim 2, characterized in that, The first air outlet section (41) is divided into four first inner surfaces along the circumferential direction, and the second air outlet section (42) is divided into four second inner surfaces along the circumferential direction. The first inner surfaces and the second inner surfaces correspond one-to-one and are smoothly connected along the axial direction.
4. The air outlet hood according to claim 3, characterized in that, The wall surface of the first air outlet section (41) is tangent to the wall surface corresponding to the volute outlet.
5. The air outlet hood according to claim 2, characterized in that, The planes on both sides of the second air outlet section (42) are parallel to each other.
6. The air outlet hood according to claim 2, characterized in that, The height of the first air outlet section (41) is the same as that of the bottom connecting seat (20), ranging from 5mm to 15mm.
7. The air outlet hood according to claim 5, characterized in that, The height range of the third air outlet section (43) is 0.5mm to 5mm.
8. The air outlet hood according to claim 5, characterized in that, The center point of the first air outlet section (41) away from the opening of the second air outlet section (42) and the center point of the third air outlet section (43) away from the opening of the second air outlet section (42) are offset along the width direction of the opening of the first air outlet section (41).
9. The air outlet hood according to claim 8, characterized in that, The center point of the first air outlet section (41) away from the side opening of the second air outlet section (42) and the center point of the third air outlet section (43) away from the side opening of the second air outlet section (42) are offset by a distance of 15mm to 35mm.
10. A range hood, characterized in that, Includes the air hood as described in any one of claims 1 to 9.