Fan shell, fan and range hood

Abstract

The utility model discloses a fan shell, a fan and a range hood, belongs to the technical field of kitchen appliances, and is designed for solving the problems of loud noise and the like when the existing range hood is used. The utility model discloses a fan shell which comprises a volute and a fan body. The volute tongue is located at the outlet end of the volute; the noise reduction structure comprises a first rectification net, a second rectification net and a third rectification net which are located on the windward side of the volute tongue, through holes are formed in the first rectification net, the second rectification net and the third rectification net correspondingly, and the noise reduction structure can prevent lampblack airflow from impacting the volute tongue. According to the draught fan shell, the draught fan and the range hood, the noise reduction structure is included, lampblack airflow can steer at the noise reduction structure and more flows towards the outlet end of the volute, the airflow impacting the volute tongue is reduced, and therefore noise is reduced, and the use experience is better; the flow loss of gas is reduced, the flow efficiency is improved, the capability of the fan to adapt to variable user working conditions is enhanced, and the efficiency and suction pressure of the range hood can be considered.

Description

Technical Field

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

[0002] The range hood uses a fan to create negative pressure, which draws indoor fumes into the range hood's smoke collection chamber. The smoke then flows through the chamber and into the fan housing, where it is then exhausted outdoors, completing the fume extraction process.

[0003] A fan primarily consists of a housing and an impeller. The impeller rotates within the housing to create negative pressure. To more thoroughly collect oil smoke, the impeller typically rotates at high speed, creating a high-speed airflow within the housing. The inner wall of the housing is typically streamlined to reduce wind resistance.

[0004] The fan housing typically consists of a volute and a tongue. The tongue is located at the air outlet of the volute. As high-speed air flows out of the outlet, it impacts the tongue, generating considerable noise. To improve the user experience, some existing range hoods utilize phase shifting to reduce noise or feature noise reduction holes. These methods fail to address the issue of high-speed airflow directly impacting the tongue, resulting in limited noise reduction effectiveness. Utility Model Content

[0005] The purpose of the utility model is to provide a fan housing, a fan and a range hood, which solve the problem of high noise during use of the existing range hood and have a good noise reduction effect.

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

[0007] The fan casing includes: a volute; a volute tongue located at the outlet end of the volute; and a noise reduction structure, including a first rectifying net, a second rectifying net and a third rectifying net located on the upwind side of the volute tongue. Through holes are respectively provided on the first rectifying net, the second rectifying net and the third rectifying net. The noise reduction structure can prevent the oil smoke airflow from hitting the volute tongue.

[0008] In one preferred embodiment, the first rectifying net, the second rectifying net and the third rectifying net are sequentially arranged on the profile of the volute, the first rectifying net is closest to the volute tongue, and the third rectifying net is farthest from the volute tongue.

[0009] In one preferred embodiment, the first rectifying net is provided with at least two circular holes with a diameter of r1, the second rectifying net is provided with at least two circular holes with a diameter of r2, and the third rectifying net is provided with at least two circular holes with a diameter of r3, where r1<r2<r3.

[0010] In one preferred embodiment, the porosity σ1 of the first rectifying mesh is less than the porosity σ2 of the second rectifying mesh and less than the porosity σ3 of the third rectifying mesh.

[0011] In one preferred embodiment, along the cross section perpendicular to the axis, the cross sections of the first rectifying network, the second rectifying network and the third rectifying network are all arc-shaped, and the arc diameter R1 of the first rectifying network is greater than the arc diameter R2 of the second rectifying network and greater than the arc diameter R3 of the third rectifying network.

[0012] In one of the preferred embodiments, along the cross section perpendicular to the axis, the cross section of the first straightening net, the second straightening net and / or the third straightening net is arc-shaped, the arc protrudes in the upwind direction, and one end of the arc can allow the airflow entering the volute circulation to converge into the outlet end of the volute.

[0013] In one preferred embodiment, along a cross section perpendicular to the axis, the cross section of the first rectifying network, the second rectifying network and / or the third rectifying network is V-shaped.

[0014] In one preferred embodiment, the volute includes an upper cover plate and a lower cover plate, and the first rectifying net, the second rectifying net and the third rectifying net are all cylindrical bodies, one end of the column is connected to the upper cover plate, and the other end of the column is connected to the lower cover plate.

[0015] On the other hand, the present invention adopts the following technical solutions:

[0016] The fan comprises an impeller and the fan housing. The impeller is arranged in the volute.

[0017] On the other hand, the present invention adopts the following technical solutions:

[0018] A range hood comprising the above-mentioned fan.

[0019] The fan casing disclosed by the utility model includes a noise reduction structure. The oil fume airflow will be turned at the noise reduction structure and flow more toward the outlet end of the volute, reducing the amount of air hitting the volute tongue, thereby reducing noise and providing a better user experience; reducing gas flow loss, improving flow efficiency, and enhancing the fan's ability to adapt to changing user working conditions, while taking into account both the efficiency and suction pressure of the range hood.

[0020] The fan disclosed in the present invention also includes the above-mentioned fan housing. The range hood disclosed in the present invention includes the above-mentioned fan, which can reduce the impact of the oil smoke airflow on the volute tongue, reduce the impact noise, improve the gas flow efficiency, and provide a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a fan provided by a specific embodiment of the utility model;

[0022] Figure 2 This is a structural diagram of the fan with the upper cover removed provided by a specific embodiment of the utility model;

[0023] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0024] Figure 4 This is a front view of the fan with the upper cover removed provided by a specific embodiment of the utility model;

[0025] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0026] Figure 6 This is a schematic diagram of the gas flow path when no noise reduction structure is provided;

[0027] Figure 7 It is a schematic diagram of a noise reduction structure provided by a specific embodiment of the utility model;

[0028] Figure 8 yes Figure 7 A partial enlarged view of point C in the middle;

[0029] Figure 9 It is a schematic diagram of another noise reduction structure provided by a specific embodiment of the present utility model.

[0030] In the picture:

[0031] 1. Volute; 2. Volute tongue; 3. Noise reduction structure; 4. Impeller; 5. Profile; 6. Center arc; 11. Outlet end; 12. Upper cover; 13. Lower cover; 31. First rectifier mesh; 32. Second rectifier mesh; 33. Third rectifier mesh; 41. Impeller end. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] This embodiment discloses a fan housing, a fan including the fan housing, and a range hood including the fan, such as Figures 1 to 5 As shown, the fan further includes an impeller 4 ; the fan housing includes a volute 1 , a volute tongue 2 and a noise reduction structure 3 , the volute tongue 2 is located at the outlet end 11 of the volute 1 , and the impeller 4 is arranged in the volute 1 .

[0039] The noise reduction structure 3 includes a first rectifying net 31, a second rectifying net 32 and a third rectifying net 33 located on the upwind side of the volute tongue 2. Through holes are respectively opened on the first rectifying net 31, the second rectifying net 32 and the third rectifying net 33. The noise reduction structure 3 can prevent the oil smoke airflow from hitting the volute tongue 2.

[0040] Figure 6 The curve with arrows in the middle shows the gas flow path when the noise reduction structure 3 is not provided. The oil smoke flow flowing through the impeller end 41 will directly hit the volute tongue 2, causing noise. Figure 5 The curve with an arrow in the middle shows the gas flow path after the noise reduction structure 3 is set. The oil fume airflow flowing through the impeller end 41 will turn at the noise reduction structure 3, and the oil fume airflow will flow more toward the outlet end 11 of the volute 1, reducing the amount of airflow that hits the volute tongue 2, thereby reducing noise and providing a better user experience; reducing gas flow losses, improving flow efficiency, and enhancing the fan's ability to adapt to changing user working conditions, while taking into account both the efficiency and suction pressure of the range hood.

[0041] The specific installation structure of the noise reduction structure 3 is not limited, as long as it can ensure that it remains stable under strong airflow impact. Figures 1 to 5 As shown, in this embodiment, the volute 1 includes a cylindrical body, an upper cover plate 12 and a lower cover plate 13, the upper cover plate 12 covers the upper end surface of the cylindrical body, the lower cover plate 13 covers the lower end surface of the cylindrical body, and the outlet end 11 of the volute 1 is arranged on the cylindrical body.

[0042] The first, second, and third rectifier nets 31, 32, and 33 are all cylindrical and substantially parallel to each other. One end of each column is connected to the upper cover plate 12, and the other end is connected to the lower cover plate 13. The overall structure is simple and reliable. The upper and lower cover plates 12, 13 provide a stable structure for the noise reduction structure 3. High-speed airflow will not cause any of the rectifier nets in the noise reduction structure 3 to shift, resulting in a better user experience.

[0043] Based on the above structure, the first straightening net 31, the second straightening net 32 and the third straightening net 33 are arranged in sequence on the contour line 5 of the volute 1 (that is, the contour line of the volute tongue 2). Among them, the first straightening net 31 is closest to the volute tongue 2, and the third straightening net 33 is farthest from the volute tongue 2. That is, the center of the first straightening net 31, the center of the second straightening net 32 and the center of the third straightening net 33 are all located on the arc line 6 of the center of the volute tongue 2 (as shown in FIG. Figure 7 and Figure 9 The noise reduction structure 3 combines the advantages of different tongue depths, widens the fan's operating range, and adapts to various operating environments.

[0044] The specific shape of the rectifier net is not limited, as long as the noise reduction structure 3 can block the oil smoke flow from directly hitting the volute tongue 2. In this embodiment, in the first structure, along the cross section perpendicular to the axis, the cross section of the first rectifier net 31, the second rectifier net 32 and / or the third rectifier net 33 is an arc shape. The arc shape bulges toward the upwind direction, such as Figure 5 As shown, the end of the arc shape close to the impeller end 41 can allow the airflow entering the volute 1 for circulation to converge into the outlet end 11 of the volute 1 .

[0045] That is, the cross-section of the first rectifying net 31, the second rectifying net 32, and / or the third rectifying net 33 can be understood as comprising two connected arcs of the same radius, one of which is close to the impeller end 41 and the other is far from the impeller end 41. The arc close to the impeller end 41 enables the oil smoke airflow entering the volute 1 to flow into the outlet end 11 of the volute 1 through the Coanda effect, thereby improving flow efficiency.

[0046] The specific manifestation of the Coanda effect is that the arc section near the impeller end 41 has a "spoon effect", which causes the oil fume airflow to deviate from its original flow direction and change its tendency to flow along the protruding surface of the object, thereby guiding the oil fume airflow and reducing the backflow of the oil fume airflow through the volute 1.

[0047] The first rectifying net 31, the second rectifying net 32 and the third rectifying net 33 are respectively provided with through holes for the oil smoke to pass through, and the specific size of the through holes is not limited. Figure 7 and Figure 8 As shown, the through-holes are arranged in an array. The first rectifying mesh 31 has at least two circular holes with a diameter of r1, the second rectifying mesh 32 has at least two circular holes with a diameter of r2, and the third rectifying mesh 33 has at least two circular holes with a diameter of r3, where r1 < r2 < r3. This allows the oil smoke to flow more easily through the third rectifying mesh 33, where wind resistance is reduced. The oil smoke is less likely to flow through the first rectifying mesh 31, effectively preventing it from striking the volute tongue 2 and reducing noise.

[0048] In order to further reduce noise, the porosity σ1 on the first rectifying net 31 is less than the porosity σ2 on the second rectifying net 32 and less than the porosity σ3 on the third rectifying net 33. The oil fume airflow is more likely to pass through the third rectifying net 33 and is not easy to pass through the first rectifying net 31. The first rectifying net 31 has a better guiding effect on the oil fume airflow. The oil fume airflow turns around the outer surface of the first rectifying net 31 to avoid directly hitting the volute tongue 2, reducing noise and improving flow efficiency; the third rectifying net 33 has a good rectifying effect. After passing through the third rectifying net 33, the oil fume airflow can smoothly reach the outlet end 11 of the volute 1, preventing the oil fume airflow from rushing towards the volute tongue 2 in advance, thereby reducing impact noise.

[0049] Based on the above structure, the specific dimensions of the noise reduction structure 3 are not limited. In this embodiment, along a cross-section perpendicular to the axis, the cross-sections of the first, second, and third rectifier nets 31, 32, and 33 are all arc-shaped, with the arc diameter R1 of the first rectifier net 31 greater than the arc diameter R2 of the second rectifier net 32, and greater than the arc diameter R3 of the third rectifier net 33. The first rectifier net 31 has a larger coverage area, which can more effectively block the oil smoke airflow from hitting the volute tongue 2, thereby reducing noise. The third rectifier net 33 has a smaller coverage area, which avoids affecting the normal airflow in the volute 1 toward the outlet end 11, thereby reducing wind resistance and energy consumption.

[0050] The second structure of the noise reduction structure 3 is as follows Figure 9 As shown, along the cross section perpendicular to the axis, the cross section of the first rectifying net 31, the second rectifying net 32 and / or the third rectifying net 33 is V-shaped, which is easy to process, has high processing efficiency and low process difficulty.

[0051] 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. Fan housing, characterized in that, include: volute (1); a volute tongue (2) located at the outlet end (11) of the volute (1); as well as, The noise reduction structure (3) comprises a first rectifying net (31), a second rectifying net (32) and a third rectifying net (33) located on the upwind side of the volute tongue (2), wherein the first rectifying net (31), the second rectifying net (32) and the third rectifying net (33) are respectively provided with through holes, and the noise reduction structure (3) can prevent the oil smoke airflow from hitting the volute tongue (2).

2. The fan housing according to claim 1, characterized in that: The first rectifying net (31), the second rectifying net (32) and the third rectifying net (33) are sequentially arranged on the profile line (5) of the volute (1), the first rectifying net (31) being closest to the volute tongue (2), and the third rectifying net (33) being farthest from the volute tongue (2).

3. The fan housing according to claim 1, characterized in that: The first rectifying net (31) is provided with at least two circular holes with a diameter of r1, the second rectifying net (32) is provided with at least two circular holes with a diameter of r2, and the third rectifying net (33) is provided with at least two circular holes with a diameter of r3, where r1<r2<r3.

4. The fan housing according to claim 1, characterized in that: The porosity σ1 on the first rectifying net (31) is less than the porosity σ2 on the second rectifying net (32) and is less than the porosity σ3 on the third rectifying net (33).

5. The fan housing according to claim 1, characterized in that: In a cross section perpendicular to the axis, the cross sections of the first rectifying net (31), the second rectifying net (32) and the third rectifying net (33) are all arc-shaped, and the arc diameter R1 of the first rectifying net (31) is greater than the arc diameter R2 of the second rectifying net (32) and is greater than the arc diameter R3 of the third rectifying net (33).

6. The fan housing according to claim 1, characterized in that: In a cross section perpendicular to the axis, the cross section of the first rectifying net (31), the second rectifying net (32) and / or the third rectifying net (33) is in the shape of a circular arc, the circular arc protrudes in the upwind direction, and one end of the circular arc can allow the airflow entering the volute (1) for circulation to converge into the outlet end (11) of the volute (1).

7. The fan housing according to claim 1, characterized in that: In a cross section perpendicular to the axis, the cross section of the first rectifying network (31), the second rectifying network (32) and / or the third rectifying network (33) is V-shaped.

8. The fan housing according to any one of claims 1 to 7, characterized in that: The volute (1) comprises an upper cover plate (12) and a lower cover plate (13); the first rectifying net (31), the second rectifying net (32) and the third rectifying net (33) are all columnar bodies, one end of each columnar body is connected to the upper cover plate (12), and the other end of each columnar body is connected to the lower cover plate (13).

9. A fan comprising an impeller (4), characterized in that The fan further comprises a fan housing according to any one of claims 1 to 8, and the impeller (4) is arranged in the volute (1).

10. A range hood, characterized in that: Comprising the fan as claimed in claim 9.

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