Current collector, fan comprising same and range hood comprising same

Abstract

The utility model provides a current collector and a fan and a range hood comprising the same, the current collector is arranged at an air inlet of a volute, the current collector comprises a flow guide face, the flow guide face is arranged away from the volute, a plurality of flow guide protrusions or flow guide recesses are arranged on the flow guide face, the flow guide protrusions or the flow guide recesses are arranged, and the flow guide protrusions or the flow guide recesses are arranged on the flow guide face. The multiple flow guide protrusions or the multiple flow guide concaves are arranged at intervals from the first end of the flow guide face to the second end of the flow guide face. The flow guide protrusions or the flow guide recesses are arranged from the first end to the second end of the flow guide surface, so that some small-scale vortexes are generated when airflow flows through the flow guide surface, the small-scale vortexes can hinder formation of large-scale turbulent vortexes in cooking fume, energy loss caused by the small-scale turbulent vortexes is much smaller than that caused by the large-scale turbulent vortexes, and energy consumption is reduced. And therefore, the total energy loss caused by turbulence is reduced, the noise is effectively reduced finally, and the aerodynamic performance of the current collector can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technology field of current collector, especially to a current collector and contain its fan, range hood. BACKGROUND

[0002] In the range hood, the flow guiding ability of the current collector is the key factor affecting the performance of the fan. Its core role is to smoothly and smoothly guide the oil fume flowing from the outlet of the range hood upward along the axial direction into the impeller, thereby avoiding the turbulence phenomenon caused by the sudden change of the oil fume flow direction. In order to reduce the flow resistance, the current market range hood current collector generally adopts smooth wall surface design.

[0003] Due to the structural characteristics of the range hood, when the oil fume flows through the vicinity of the current collector, its flow path will inevitably be distorted. In this process, the boundary layer separation effect generated when the airflow flows will cause relatively strong turbulent vortex of the oil fume near the current collector, thereby inducing the generation of broadband noise. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the defects of the current collector surface flatness easily causing turbulence and noise in the prior art, and to provide a current collector and a fan and a range hood containing the same.

[0005] The utility model solves the above technical problems by the following technical scheme:

[0006] A current collector is arranged at the air inlet of a volute, and the current collector comprises:

[0007] A flow guiding surface is arranged away from the volute, and the flow guiding surface is provided with flow guiding protrusions or flow guiding recesses, the flow guiding protrusions or the flow guiding recesses are arranged in multiple, and the multiple flow guiding protrusions or the flow guiding recesses are arranged from a first end of the flow guiding surface to a second end of the flow guiding surface.

[0008] In the present scheme, the flow guiding protrusions or the flow guiding recesses are arranged at the first end and the second end of the flow guiding surface, so as to generate some small-scale vortexes when the airflow flows through the flow guiding surface. These small-scale vortexes will hinder the formation of large-scale turbulent vortexes in the oil fume, and the energy loss caused by the small-scale turbulent vortexes is much smaller than that caused by the large-scale turbulent vortexes, thereby reducing the total energy loss caused by the turbulence, and finally effectively reducing the noise. At the same time, the resistance of the airflow in the current collector can be reduced, and the aerodynamic performance of the current collector can be effectively improved without complex aerodynamic design process. Compared with the traditional smooth wall surface current collector, the flow guiding surface with the flow guiding protrusions or the flow guiding recesses can effectively delay the separation phenomenon of the oil fume on the wall surface, reduce the velocity gradient of the oil fume near the flow guiding surface, and significantly improve the transmission efficiency of the oil fume.

[0009] Preferably, the flow guide protrusion or the flow guide recess is in a semi-spherical structure.

[0010] In this scheme, the above arrangement is used to delay the separation of the boundary layer airflow of the flow guide surface.

[0011] Preferably, the flow guide protrusions or the flow guide recesses are arranged in multiple groups along the circumferential direction of the flow guide surface, and the adjacent two groups of flow guide protrusions or flow guide recesses are arranged at intervals, and each group of flow guide protrusions or flow guide recesses is located on the same horizontal plane.

[0012] In this scheme, the flow guide protrusions or flow guide recesses are arranged at different positions in the circumferential direction to avoid the situation that the smooth surface of part of the flow guide surface causes turbulent flow when the airflow passes through.

[0013] Preferably, the number of flow guide protrusions or flow guide recesses in each group is 30-60.

[0014] In this scheme, the above arrangement is used to ensure the effect of delaying the separation of the boundary layer airflow of the flow guide surface.

[0015] Preferably, the circumferential center of each group of flow guide protrusions or flow guide recesses is coaxially arranged with the axis of the current collector.

[0016] In this scheme, the above arrangement is used to avoid the turbulent flow that may be caused when the circumferential center of the flow guide protrusion or the flow guide recess does not coincide with the axis of the current collector.

[0017] Preferably, the radius of the flow guide protrusion or the flow guide recess is 4-8mm.

[0018] In this scheme, the above arrangement is used to avoid the flow resistance to the airflow caused by the size of the flow guide protrusion or the flow guide recess being too large.

[0019] Preferably, the flow guide protrusions or the flow guide recesses are arranged in a straight line direction from the first end of the flow guide surface to the second end of the flow guide surface.

[0020] In this scheme, the above arrangement is used to avoid the turbulent flow caused by the flow guide protrusion or the flow guide recess changing the flow direction of the airflow when the airflow flows through the current collector.

[0021] Preferably, the flow guide protrusion or the flow guide recess is arranged at an interval from the first end or the second end edge of the flow guide surface.

[0022] In this scheme, the above arrangement is used to avoid the boundary layer separation caused by the flow guide protrusion or the flow guide recess when the airflow and the edge of the current collector.

[0023] A fan includes a volute and a collector as described above, the collector being disposed at the air inlet of the volute.

[0024] In this design, the fan includes a volute and the aforementioned collector. The collector's guide surface delays boundary layer separation. Compared to traditional collector aerodynamic performance optimization methods, which involve more complex manufacturing processes such as profile reconstruction and innovative guide structures, and are highly sensitive to equipment precision and manufacturing and installation tolerances, the guide protrusions or recesses have relatively relaxed requirements for surface texture and dimensional precision. Within a certain range of fluctuation, they can still achieve good drag reduction, making them very suitable for large-scale production applications.

[0025] A range hood, the range hood comprising the fan described above.

[0026] In this solution, the range hood includes the aforementioned fan, which reduces operating noise and improves aerodynamic performance through a collector on the fan, thereby enhancing the user experience.

[0027] The significant advantages of this invention are as follows: By providing guide protrusions or depressions at both the first and second ends of the guide surface, small-scale vortices are generated when the airflow passes through the guide surface. These small-scale vortices hinder the formation of large-scale turbulent vortices within the oil fume. Compared to large-scale turbulent vortices, the energy loss caused by small-scale turbulent vortices is much smaller, thereby reducing the total energy loss caused by turbulence and ultimately effectively reducing noise. Simultaneously, it reduces airflow resistance within the collector, effectively improving the aerodynamic performance of the collector without requiring complex aerodynamic design processes. Compared to traditional collectors with smooth walls, the guide surface with guide protrusions or depressions effectively delays the separation of oil fumes from the wall, reduces the velocity gradient of oil fumes near the guide surface, and significantly improves the transmission efficiency of oil fumes. Attached Figure Description

[0028] Figure 1 This is a perspective view of a fan according to a preferred embodiment of the present invention.

[0029] Figure 2 This is a perspective view of a current collector according to a preferred embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] Collector 10

[0032] 20 volcano

[0033] Guide surface 1

[0034] Guide protrusion 2 Detailed Implementation

[0035] The utility model is more clearly and completely illustrated below with a preferred embodiment and in connection with the drawings.

[0036] The embodiment provides a current collector 10, and the specific structure is as shown in Figure 1 and Figure 2 The current collector 10 is arranged at the air inlet of the volute 20, and the current collector 10 comprises:

[0037] The flow guide surface 1 is arranged away from the volute 20, the flow guide surface 1 is provided with flow guide protrusions 2 or flow guide recesses (not shown in the figure), the flow guide protrusions 2 or flow guide recesses are provided in plurality, and the plurality of flow guide protrusions 2 or flow guide recesses are arranged from the first end of the flow guide surface 1 to the second end of the flow guide surface 1.

[0038] Specifically, the current collector 10 is in a horn shape structure, the first end of the current collector 10 is larger than the second end in size, the outer circumferential side of the current collector 10 is used for being embedded at the air inlet of the volute 20, the flow guide surface 1 is arranged at the side of the current collector 10 away from the volute 20, and the flow guide surface 1 is used for being contacted with the airflow, that is, the airflow enters the air inlet of the volute 20 through the flow guide surface 1. The flow guide surface 1 is provided with flow guide protrusions 2 or flow guide recesses, the flow guide protrusions 2 or flow guide recesses are protrusions or recesses arranged from the flow guide surface 1, and the flow guide protrusions 2 or flow guide recesses are arranged from the first end of the flow guide surface 1 to the second end of the flow guide surface 1, that is, compared with the part of the region provided with the flow guide protrusions 2 or flow guide recesses and the remaining part of the region being a smooth plane, the flow guide protrusions 2 or flow guide recesses have a larger coverage area when the airflow flows through the current collector 10, that is, the flow guide protrusions 2 or flow guide recesses fully cover the flow guide surface 1, and the flow guide protrusions 2 or flow guide recesses can generate some small-scale vortexes when the airflow flows through the flow guide surface 1. These small-scale vortexes can hinder the formation of large-scale turbulent vortexes inside the airflow or the oil fume, compared with the large-scale turbulent vortexes, the energy loss caused by the small-scale turbulent vortexes is much smaller, thereby reducing the total energy loss caused by the turbulent flow, and finally promoting the noise to be effectively reduced. At the same time, the resistance of the airflow in the current collector can be reduced without a complex aerodynamic design process, and the aerodynamic performance of the current collector can be effectively improved.

[0039] It can be understood that, compared with the conventional current collector with a smooth wall surface in all regions, the flow guide surface 1 with the flow guide protrusions 2 or flow guide recesses can effectively delay the separation phenomenon of the oil fume on the wall surface, reduce the velocity gradient of the oil fume near the flow guide surface, the flow guide surface 1 with the flow guide protrusions 2 or flow guide recesses can destroy the formation of the turbulent vortex, thereby reducing the energy loss caused by the turbulent flow, effectively reducing the flow resistance of the airflow or the oil fume, and significantly improving the transmission efficiency of the oil fume.

[0040] In the embodiment, the flow guide protrusions 2 or flow guide recesses are in a hemispherical structure.

[0041] Specifically, the flow guide protrusions 2 or flow guide depressions are made on the flow guide surface 1 by a stamping process in the prior art, the flow guide protrusions 2 extend towards the air inlet, while the flow guide depressions extend away from the air inlet, thereby forming a non-smooth structure on the flow guide surface 1, which weakens the boundary layer separation effect that may occur on the flow guide surface 1. Compared with protrusions or depressions of other shapes, the semi-spherical structure has smaller resistance to the airflow, so as to ensure that the airflow flows more smoothly through the flow guide surface 1.

[0042] In this embodiment, the flow guide protrusions 2 or flow guide depressions are arranged in multiple groups along the circumferential direction of the flow guide surface 1, and adjacent two groups of flow guide protrusions 2 or flow guide depressions are arranged at intervals. Each group of flow guide protrusions 2 or flow guide depressions is located on the same horizontal plane.

[0043] Specifically, the flow guide protrusions 2 or flow guide depressions are arranged in multiple groups and arranged in groups along the circumferential direction of the flow guide surface 1, and adjacent two groups are arranged at intervals. The airflow at different positions in the circumferential direction is delayed from the possible boundary layer separation effect, so as to avoid the case that the surface of part of the flow guide surface is smooth and causes turbulent flow when the airflow passes through. The multiple flow guide protrusions 2 or flow guide depressions in each group are located on the same horizontal plane, so as to prevent the case that the multiple flow guide protrusions 2 or flow guide depressions in each group are located on different horizontal planes and cannot effectively separate the boundary layer.

[0044] Further, in this embodiment, the number of flow guide protrusions 2 or flow guide depressions in each group is 30-60. By limiting the number of flow guide protrusions 2 or flow guide depressions in each group, the effect of delaying the boundary layer airflow separation of the flow guide surface 1 is ensured.

[0045] In this embodiment, the circumferential center where each group of flow guide protrusions 2 or flow guide depressions is located is coaxially arranged with the axis of the flow collector 10. Compared with the case that the circumferential center where each group of flow guide protrusions 2 or flow guide depressions is located is not coaxial with the axis of the flow collector 10, the coaxial arrangement makes the effect of delaying the boundary layer separation consistent when the airflow enters from different directions, while the non-coaxial arrangement of the circumferential center and the axis of the flow collector 10 causes the circumferential center where each group of flow guide protrusions 2 or flow guide depressions is located to guide the airflow towards a certain area of the flow guide surface 1, which changes the flow direction of the airflow flowing through the flow guide surface 1, thereby intensifying the formation of turbulent flow. Therefore, the coaxial arrangement of the circumferential center where the flow guide protrusions or flow guide depressions are located and the axis of the flow collector can reduce the turbulent flow.

[0046] In this embodiment, the radius of the flow guide protrusions 2 or flow guide depressions is 4-8 mm.

[0047] Specifically, the cross section of the semi-spherical structure is semicircular, and the radius of the semicircle is 4-8 mm. By limiting the radius of the flow guide protrusions 2 or flow guide depressions, the size of the flow guide protrusions 2 or flow guide depressions is prevented from being too large to generate flow resistance to the airflow.

[0048] In the embodiment, the guide protrusions 2 or the guide recesses are arranged in a straight line direction along the direction from the first end of the guide surface 1 to the second end of the guide surface 1. By arranging the guide protrusions 2 or the guide recesses in a straight line direction, the turbulence caused by the guide protrusions 2 or the guide recesses changing the flow direction of the airflow when the airflow flows through the collector 10 is avoided.

[0049] In the embodiment, the guide protrusions 2 or the guide recesses are arranged at intervals from the edges of the first end or the second end of the guide surface 1. It should be noted that, since the guide protrusions 2 or the guide recesses are non-smooth structures on the guide surface 1, in order to prevent the collector edges from causing boundary layer separation when the airflow contacts the first end or the second end of the collector 10, the guide protrusions 2 or the guide recesses are arranged at intervals from the edges of the first end or the second end of the guide surface 1, so that the airflow entering the collector 10 is more stable, the velocity gradient is reduced, and the air intake resistance is reduced.

[0050] The embodiment also provides a fan, which comprises the collector 10 and the volute 20. The guide surface 1 of the collector 10 delays the separation of the boundary layer, and compared with the conventional collector aerodynamic performance optimization, for example, the profile reconstruction, the guide structure innovation and the like manufacturing process is more complex, the device precision requirement is higher, and the method is extremely sensitive to the manufacturing tolerance and the installation tolerance and the like factors. The guide protrusions 2 or the guide recesses have relatively loose precision requirements for the surface texture and the size, and within a certain fluctuation range, good resistance reduction effect can still be achieved, and the guide protrusions 2 or the guide recesses are very suitable for large-scale production application.

[0051] The embodiment also provides a range hood, which comprises the fan. The collector 10 of the fan reduces the working noise, improves the aerodynamic performance, and further improves the user experience.

[0052] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, and these changes and modifications all fall within the protection scope of the utility model.

Claims

1. A collector provided at an air inlet of a volute, characterized by, The current collector comprises: A flow guide surface is arranged away from the volute, and a flow guide protrusion or a flow guide recess is arranged on the flow guide surface, a plurality of flow guide protrusions or flow guide recesses are arranged from a first end of the flow guide surface to a second end of the flow guide surface.

2. The current collector of claim 1, wherein The flow guide protrusion or the flow guide recess is a hemispherical structure.

3. The current collector of claim 2, wherein The flow guide protrusions or the flow guide recesses are arranged in multiple groups along the circumferential direction of the flow guide surface, and two adjacent groups of the flow guide protrusions or the flow guide recesses are arranged at intervals, and each group of the flow guide protrusions or the flow guide recesses is located on the same horizontal plane.

4. The current collector of claim 3, wherein The number of the flow guide protrusions or the flow guide recesses in each group is 30-60.

5. The current collector of claim 4, wherein The circumferential center of each group of the flow guide protrusions or the flow guide recesses is coaxially arranged with the axis of the current collector.

6. The current collector of claim 2, wherein The radius of the flow guide protrusion or the flow guide recess is 4-8 mm.

7. The current collector of claim 1, wherein The flow guide protrusions or the flow guide recesses are arranged in a straight line direction from the first end of the flow guide surface to the second end of the flow guide surface.

8. The current collector of claim 1, wherein The flow guide protrusions or the flow guide recesses are arranged at intervals from the edges of the first end or the second end of the flow guide surface.

9. A fan comprising a volute, characterised in that, The fan further comprises the current collector according to any one of claims 1-8, and the current collector is arranged at the air inlet of the volute.

10. An extractor hood, characterized in that The range hood comprises the fan according to claim 9.

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