Flow guide structure and range hood comprising same

Abstract

The utility model provides a diversion structure and a range hood comprising the same, the diversion structure is used for diversion of airflow flowing into an upper box body fan from a lower box body of the range hood, the diversion structure is arranged at the joint of the upper box body and the lower box body, and is positioned on the side wall, facing the fan, of the upper box body, and the diversion structure is used for diversion of the airflow flowing into the upper box body fan from the lower box body. The flow guide structure comprises a flow guide face and flow guide parts, the flow guide parts are arranged in a protruding mode from the flow guide face to the fan, the number of the flow guide parts is at least two, and the flow guide parts extend in the length direction of the flow guide face. The flow guide surface is arranged at the joint of the upper box body and the lower box body, so that the included angle of the joint of the upper box body and the lower box body is reduced through the flow guide surface, the joint is smoother, that is, airflow transition is smoother through the flow guide surface, and in addition, the flow guide part is convexly arranged to further reduce the flow separation phenomenon of fluid on the side walls of the upper box body and the lower box body. And airflow distribution caused by an overlarge included angle at the joint is avoided.

Description

Technical Field

[0001] The utility model particularly relates to a flow guide structure and a range hood comprising the same. Background Art

[0002] Currently, the upper and lower housings of range hoods are commonly joined directly together using two panels, resulting in a large transition angle. This means there's no transitional curved surface. However, as fluid flows from the lower housing into the upper housing, the equivalent cross-sectional area suddenly changes, causing flow separation at the sides. This converts kinetic energy into pressure energy, generating a pressure differential. This also creates vortices, increasing resistance and leading to increased local losses, which in turn reduces the airflow and efficiency of the fan system. Utility Model Content

[0003] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the connection between the upper and lower boxes easily generates diversion of the air flow, and to provide a flow guide structure and a range hood including the same.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A guide structure is provided, which is used to guide the airflow from the lower box of a range hood to the fan in the upper box. The guide structure is arranged at the connection between the upper box and the lower box, and is located on the side wall of the upper box facing the fan. The guide structure includes a guide surface and a guide part. The guide part protrudes from the guide surface toward the fan. At least two guide parts are provided, and at least two of the guide parts extend along the length direction of the guide surface.

[0006] In this solution, a guide surface is provided at the connection between the upper and lower boxes to reduce the angle at the connection between the upper and lower boxes, thereby making the connection smoother, that is, the airflow transition is smoother through the guide surface. In addition, a protruding guide portion is provided to further reduce the flow separation of the side wall fluid of the upper and lower boxes, avoid the air flow diversion caused by the excessively large angle at the connection, and reduce the accumulation of diversion into vortexes and increase the intake resistance for the fan inlet. The fan intake resistance is reduced accordingly, ensuring the airflow flow entering the fan, thereby improving the working efficiency of the fan.

[0007] Preferably, the guide portions are in a strip-shaped structure and two adjacent guide portions are spaced apart.

[0008] In this solution, the above arrangement enables the airflow to pass between the two guide parts, thereby improving the flow converging effect and reducing airflow diversion.

[0009] Preferably, the distance between two adjacent guide parts is greater than 10 mm and less than 20 mm.

[0010] In this solution, the above arrangement is used to ensure the flow rate of the airflow passing between the two guide parts.

[0011] Preferably, the width of each of the guide portions is greater than 5 mm and less than 10 mm.

[0012] In this solution, the above-mentioned arrangement is used to ensure the guiding effect of the guide portion on the airflow.

[0013] Preferably, the thickness of the guide portion is greater than 0 mm and less than 10 mm.

[0014] In this solution, the above arrangement is used to ensure that the thickness of the protruding arrangement of the guide portion can effectively guide the airflow.

[0015] Preferably, both ends of the guide portion are arranged flush with the edge of the guide surface.

[0016] In this solution, the above arrangement is used to avoid the situation where the length of the guide portion is smaller than the length of the guide surface, which may cause the airflow to be split between the edge of the guide surface and the end of the guide portion.

[0017] Preferably, the cross section of the guide surface is an arc-shaped structure, and the cross section of the guide portion is also an arc-shaped structure.

[0018] In this solution, the above-mentioned arrangement is used to improve the transition effect at the connection between the upper and lower box side walls and reduce airflow resistance.

[0019] Preferably, the opening of the arc-shaped structure is arranged toward the outer peripheral side of the range hood.

[0020] In this solution, through the above arrangement, compared with the arrangement in which the opening is directed toward the fan, the resistance to the airflow is smaller, and the airflow can smoothly enter the fan inlet.

[0021] Preferably, the guide surface and the side plate of the lower box body are integrally formed.

[0022] In this solution, the above arrangement is used to achieve the guiding effect of the guide surface on the airflow flowing from the side panel into the upper box body.

[0023] A range hood comprises the above-mentioned flow guiding structure.

[0024] In this solution, the range hood includes the above-mentioned flow guide structure, so that the fan inlet resistance of the range hood is further reduced, thereby ensuring the air flow entering the fan, and thus improving the working efficiency of the fan.

[0025] The positive progressive effect of the present invention is that: the present invention provides a guide surface at the connection between the upper and lower boxes to reduce the angle at the connection between the upper and lower boxes through the guide surface, thereby making the connection smoother, that is, the airflow transition is smoother through the guide surface. In addition, the guide portion is provided with a protruding portion to further reduce the flow separation phenomenon of the side wall fluid of the upper and lower boxes, avoid the air flow diversion caused by the excessively large angle at the connection, and reduce the accumulation of diversion into vortex and increase the air intake resistance for the fan inlet. The fan intake resistance is reduced accordingly, ensuring the air flow rate entering the fan, thereby improving the working efficiency of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a three-dimensional diagram of a range hood according to a preferred embodiment of the present invention.

[0027] Figure 2 This is a diagram showing the positional relationship between the guide surface and the upper and lower boxes in a preferred embodiment of the present invention.

[0028] Figure 3 This is a diagram showing the positional relationship between the guide portion and the guide surface of a preferred embodiment of the present invention.

[0029] Figure 4 This is a three-dimensional diagram of a diversion structure according to a preferred embodiment of the present invention.

[0030] Description of reference numerals:

[0031] Range hood 100

[0032] Upper box 10

[0033] Lower box 20

[0034] Side panel 21

[0035] Fan 30

[0036] Diversion structure 40

[0037] Guide surface 41

[0038] guide portion 42 DETAILED DESCRIPTION

[0039] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0040] This embodiment provides a flow guiding structure 40, the specific structure of which is as follows Figure 1 、 Figure 2 、 Figure 3 and Figure 4As shown, the range hood 100 includes an upper housing 10 and a lower housing 20. The lower housing 20 is positioned toward the cooktop to direct the cooking fumes generated by the cooktop into the range hood 100. The cooking fumes entering the lower housing 20 are drawn from the upper housing 10 by the fan 30 located within the upper housing 10 and ultimately discharged from the air outlet of the range hood 100. This is conventional technology and will not be described in detail herein. A guide structure 40 is provided to guide the airflow from the lower housing 20 of the range hood 100 into the fan 30 of the upper housing 10. The guide structure 40 is disposed at the junction of the upper and lower housings 10 and on the side wall of the upper housing 10 facing the fan 30. The guide structure 40 includes a guide surface 41 and a guide portion 42. The guide portion 42 protrudes from the guide surface 41 toward the fan 30. There are at least two guide portions 42, and at least two guide portions 42 extend along the length of the guide surface 41.

[0041] Specifically, the guide surface 41 is arranged at the connection between the upper box body 10 and the lower box body 20, one end of the guide surface 41 is connected to the side panel 21 of the lower box body 20, and the other end is connected to the side wall of the upper box body 10. By arranging the guide surface 41 at the connection between the upper and lower boxes, the angle at the connection between the upper and lower boxes can be reduced by the guide surface 41. Compared with the method in which the connection between the upper and lower boxes is arranged at an angle and there is no other guide structure, the guide surface 41 can make the connection smoother, that is, the airflow transition at the connection is achieved through the guide surface 41, so that the airflow passing through this place is smoother.

[0042] In addition, a guide portion 42 is protruding from the guide surface 41, and the guide portion 42 is located on the surface of the guide surface 41 facing the fan 30. At least two guide portions 42 are provided to effectively guide the airflow through the two protruding guide portions 42, that is, to guide the airflow into the upper box body 10, so as to further reduce the flow separation phenomenon of the side wall fluid of the upper and lower boxes, thereby reducing the accumulation of diversion into vortex and increasing the intake resistance for the inlet of the fan 30. The intake resistance of the fan 30 is reduced accordingly, ensuring the airflow rate entering the fan 30, thereby improving the working efficiency of the fan 30.

[0043] In other embodiments, a plurality of guide portions 42 may be provided, and the plurality of guide portions 42 are parallel to each other, so as to improve the airflow guiding effect by increasing the number of guide portions 42 .

[0044] In this embodiment, the guide portions 42 are strip-shaped structures and two adjacent guide portions 42 are spaced apart.

[0045] It is understood that the guide portion 42 is a strip-shaped structure extending along the length of the guide surface 41. The two guide portions 42 are spaced apart along the width of the guide surface 41 to form a gap between the two guide portions 42. The gap only contains the guide surface 41. When airflow passes through the gap, it can pass between the two guide portions 42, thereby converging the airflow into the gap, thereby reducing airflow diversion and improving the converging effect.

[0046] Furthermore, the spacing between adjacent flow guides 42 is greater than 10 mm and less than 20 mm. Analysis using finite element software in the prior art indicates that this spacing between adjacent flow guides 42 enhances the flow focusing effect and ensures a high flow rate between the two flow guides 42. Finite element software is conventionally used for fluid analysis and is not modified in this embodiment, so its further description is omitted.

[0047] In this embodiment, the width of each guide portion 42 is greater than 5 mm and less than 10 mm. According to finite element analysis, compared with a guide portion 42 having a width greater than 10 mm, the above range has a better airflow guiding effect.

[0048] In this embodiment, the thickness of the air guide portion 42 is greater than 0 mm and less than 10 mm. Finite element analysis shows that, compared to a thickness of the air guide portion 42 greater than 10 mm, this thickness range ensures that the protruding thickness of the air guide portion 42 effectively guides the airflow without affecting the flow rate of the airflow into the inlet of the fan 30, thereby increasing the airflow resistance at the inlet of the fan 30.

[0049] In this embodiment, both ends of the guide portion 42 are flush with the edge of the guide surface 41 .

[0050] Specifically, the two ends of the guide portion 42 of the strip structure are arranged flush with the end edges of the guide surface 41, that is, the length of the guide portion 42 is the same as the length of the guide surface 41, so as to avoid the situation where the length of the guide portion 42 is less than the length of the guide surface 41, which may cause the airflow to be diverted between the edge of the guide surface 41 and the end of the guide portion 42.

[0051] Furthermore, in this embodiment, the cross-section of the guide surface 41 is an arc-shaped structure, and the cross-section of the guide portion 42 is also an arc-shaped structure. From a cross-sectional view, the guide surface 41 and the guide portion 42 are both arc-shaped structures. Compared with other shapes, the arc-shaped structure guides and transitions the airflow more smoothly, thereby improving the transition effect at the connection between the upper and lower box side walls and reducing airflow resistance.

[0052] In this embodiment, the opening of the arc-shaped structure is arranged toward the outer peripheral side of the range hood 100 .

[0053] Specifically, a coordinate system is formed from the cross section of the guide surface 41, wherein the intersection of the extension lines of the side walls of the upper box body 10 and the lower box body 20 is the origin, the angle bisector of the two extension lines is the Y axis, and the direction from the origin toward the guide surface 41 is the positive direction of the Y axis, and the direction perpendicular to the Y axis and from the origin toward the inlet of the fan 30 is the positive direction of the X axis. The arc structure is located in the coordinate system, and the arc structure is calculated by formula (1), which is y=-ax 2 +b, where the ranges of a and b are both greater than 0, and the values of x and y vary depending on the coordinates of the connection between the upper and lower housings of different range hoods 100. This is prior art and will not be elaborated upon here. It can be understood that, according to formula (1), the opening direction of the guide surface 41 is toward the outer periphery of the range hood 100. Compared to a configuration in which the opening is toward the fan 30, the resistance to the airflow is smaller, allowing the airflow to smoothly enter the inlet of the fan 30.

[0054] In this embodiment, the guide surface 41 is integrally formed with the side panel 21 of the lower box body 20. The airflow flowing from the side panel 21 into the upper box body 10 can directly flow through the side panel 21 into the guide surface 41, thereby guiding the airflow from the lower box body 20 to the upper box body 10.

[0055] This embodiment further provides a range hood 100 including the aforementioned air guide structure 40. The range hood 100 includes the aforementioned air guide structure 40 to further reduce inlet resistance at the fan 30 of the range hood 100, thereby ensuring a high airflow rate entering the fan 30 and improving the operating efficiency of the fan 30.

[0056] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A flow guide structure for guiding the airflow from the lower box of a self-priming range hood to the fan in the upper box, characterized in that: The guide structure is arranged at the connection between the upper box body and the lower box body, and is located on the side wall of the upper box body facing the fan. The guide structure includes a guide surface and a guide portion. The guide portion protrudes from the guide surface toward the fan. There are at least two guide portions, and at least two of the guide portions extend along the length direction of the guide surface.

2. The flow guide structure according to claim 1, wherein: The guide portions are in a strip-shaped structure and are spaced apart from each other.

3. The flow guide structure according to claim 2, wherein: The distance between two adjacent guide parts is greater than 10 mm and less than 20 mm.

4. The flow guide structure according to claim 3, wherein: The width of each of the guide portions is greater than 5 mm and less than 10 mm.

5. The flow guide structure according to claim 4, characterized in that: The thickness of the guide portion is greater than 0 mm and less than 10 mm.

6. The flow guide structure according to claim 1, wherein: Both ends of the guide portion are arranged flush with the edge of the guide surface.

7. The flow guide structure according to claim 1, wherein: The cross section of the flow guide surface is an arc-shaped structure, and the cross section of the flow guide portion is also an arc-shaped structure.

8. The flow guide structure according to claim 7, wherein: The opening of the arc-shaped structure is arranged toward the outer peripheral side of the range hood.

9. The flow guide structure according to claim 1, wherein: The guide surface is integrally formed with the side plate of the lower box body.

10. A range hood, characterized in that: The range hood comprises the flow guide structure according to any one of claims 1 to 9.

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