volute oil guiding structure and range hood
By optimizing the oil guiding structure and sound absorption design of the volute, the problem of secondary noise caused by the oil leakage hole in the volute of the range hood was solved, achieving the effects of noise reduction and smooth oil discharge.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO FOTILE KITCHEN WARE CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-03
AI Technical Summary
The problem of secondary noise caused by oil leakage holes in the existing range hood volute structure has not been effectively solved.
The design incorporates a volute-shaped oil guiding structure, including a volute, a sound-absorbing box, an oil leakage column, and an oil mesh. By optimizing the width of the oil guiding groove and the airflow expansion angle, the design prevents airflow from impacting the sidewalls of the oil guiding groove. Combined with the fitting design of polyurethane sound-absorbing cotton, noise generation is reduced.
It effectively reduces secondary noise caused by oil leakage holes, ensures smooth oil discharge, and improves sound absorption and fan efficiency.
Smart Images
Figure CN224453191U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of range hoods, and in particular to a volute oil guiding structure and a range hood. Background Technology
[0002] Centrifugal fans are important air supply devices inside range hoods. They mainly consist of a volute and an impeller installed inside the volute. To reduce the noise generated during operation, sound-absorbing materials such as sound-absorbing cotton are usually installed on the ring wall of the volute.
[0003] Currently, to prevent the oil accumulated inside the casing from not being drained in time, an oil drain hole is usually opened at the bottom of the casing, and a corresponding oil guiding structure is set to guide the oil to the oil cup, thereby preventing oil from contaminating the sound-absorbing material in the interlayer cavity.
[0004] However, in this type of structure, some airflow will be blown out from the oil leakage hole of the volute, thus generating a lot of secondary noise. Utility Model Content
[0005] Therefore, it is necessary to provide a volute oil guiding structure and range hood that can effectively reduce secondary noise, in order to address the problem of secondary noise caused by the current volute with oil leakage holes.
[0006] This application first provides a volute oil guiding structure, including
[0007] The volute has a first oil leakage hole at the bottom;
[0008] The sound-absorbing box is fixed to the bottom of the volute and has an oil-leaking column inside. A second oil-leaking hole is opened through the oil-leaking column, one end of which is connected to the first oil-leaking hole. The sound-absorbing box is also provided with sound-absorbing cotton.
[0009] An oil mesh is fixed relative to the sound-absorbing box and located at the bottom of the sound-absorbing box. The oil mesh forms an oil guide groove corresponding to the second oil leakage hole. The width S of the oil guide groove satisfies: S≥D+2H×tanα.
[0010] Where D is the diameter of the second oil leakage hole, H is the distance from the center point of the outlet of the second oil leakage hole to the bottom wall of the oil guide groove along the axial direction of the second oil leakage hole, and α is the airflow expansion angle at the outlet of the second oil leakage hole.
[0011] In one embodiment, the airflow expansion angle α at the outlet of the second oil leak hole satisfies: α ≥ arctan ;
[0012] Where h is the distance between the outlet of the first oil leak hole and the outlet of the second oil leak hole, and d is the outlet diameter of the first oil leak hole.
[0013] In one embodiment, the bottom of the volute is provided with an oil leak port, which is embedded in the second oil leak hole, and the first oil leak hole is provided through the inside.
[0014] In one embodiment, the diameter D of the second oil leakage hole and the outlet diameter d of the first oil leakage hole satisfy: Dd≤2mm.
[0015] In one embodiment, the oil mesh has multiple through holes, and the edges of the through holes are fixed with flanges that protrude toward the side of the volute. The flanges of two adjacent through holes and the portion of the top surface of the oil mesh located between the two through holes form the oil guide groove.
[0016] In one embodiment, the height of the flange forming the oil guide groove gradually increases along the oil guiding direction of the oil guide groove.
[0017] In one embodiment, the volute and the corresponding part of the sound-absorbing box are provided with sound-absorbing holes, and the sound-absorbing cotton is in a compressed state and completely fits the volute.
[0018] In one embodiment, the sound-absorbing cotton is polyurethane sound-absorbing cotton, and the compression amount of the polyurethane sound-absorbing cotton is 10%~20%.
[0019] In one embodiment, the sound-absorbing box is fixed to the bottom of the volute around the outer circumferential surface of the volute, and has three sets of fixing points along the circumferential direction. Two sets of fixing points are located at both ends of the sound-absorbing box along the circumferential direction, and the other set of fixing points and the oil leakage column are respectively located at both ends of the sound-absorbing box along the axial direction of the volute.
[0020] This application also provides a range hood, including the above-described volute oil guiding structure.
[0021] The aforementioned volute oil guiding structure, by designing the width S of the oil guiding groove, ensures that all the airflow diffused after passing through the second oil leakage hole directly impacts the bottom wall of the oil guiding groove, thus avoiding secondary noise caused by the diffused airflow cutting the side wall of the oil guiding groove. Attached Figure Description
[0022] Figure 1 This is a perspective view of the oil-guiding structure of the volute casing in this application;
[0023] Figure 2 for Figure 1 An exploded view from another angle;
[0024] Figure 3 for Figure 2 A three-dimensional view of the sound-absorbing box from another angle;
[0025] Figure 4 for Figure 1 A dimensional diagram along the frontal viewing direction;
[0026] Figure 5 for Figure 1 Dimensional diagram along the right-view direction.
[0027] Reference numerals: 10, volute; 11, oil leak; 111, first oil leak hole; 20, sound-absorbing box; 21, oil leak column; 211, second oil leak hole; 22, fixing point; 30, oil mesh; 31, oil guide groove; 32, through hole; 321, flange. Detailed Implementation
[0028] 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.
[0029] 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.
[0030] 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.
[0031] 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.
[0032] 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.
[0033] 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.
[0034] Please combine Figures 1 to 4 As shown, this application first provides a volute oil guiding structure, including a volute 10 with a first oil leakage hole 111 at the bottom; a sound-absorbing box 20, fixed to the bottom of the volute 10 and with an oil leakage column 21 fixed inside, a second oil leakage hole 211 through which one end is connected to the first oil leakage hole 111, and sound-absorbing cotton is also provided inside the sound-absorbing box 20; an oil mesh 30, fixed relative to the sound-absorbing box 20 and located at the bottom of the sound-absorbing box 20, the oil mesh 30 forming an oil guiding groove 31 corresponding to the second oil leakage hole 211, the width S of the oil guiding groove 31 satisfying: S≥D+2H×tanα; where D is the diameter of the second oil leakage hole 211, H is the distance from the center point of the outlet of the second oil leakage hole 211 to the bottom wall of the oil guiding groove 31 along the axial direction of the second oil leakage hole 211, and α is the airflow expansion angle at the outlet of the second oil leakage hole 211.
[0035] It is understandable that if the width of the oil guide groove S is too narrow, the rapidly expanding airflow cone after the airflow passes through the second oil leakage hole 211 will hit the side wall of the oil guide groove 31. This interaction between the high-speed airflow and the solid edge will generate high-frequency airflow noise.
[0036] In this application, the width S of the oil guide groove 31 is designed so that the airflow that diffuses after passing through the second oil leakage hole 211 directly impacts the bottom wall of the oil guide groove 31, thus avoiding the occurrence of secondary noise caused by the diffused airflow cutting the side wall of the oil guide groove 31.
[0037] Furthermore, in this application, the oil inside the volute 10 drips into the oil guide groove 31 under the action of gravity through the first oil leakage hole 111 and the second oil leakage hole 211, and flows to the final collection point (such as an oil cup) under the guidance of the oil guide groove 31. The presence of the oil guide groove 31 allows the oil to flow smoothly along the oil guide groove 31 after dripping into the groove, relying on the surface tension and flow characteristics of the oil and the slope design of the oil guide groove 31, thereby ensuring the normal realization of the oil guiding function.
[0038] In some embodiments, the oil mesh 30 can be fixed to the sound-absorbing box 20 or to the volute 10.
[0039] Please combine Figure 4 as well as Figure 5 As shown, in some embodiments, the airflow expansion angle α at the outlet of the second oil leakage hole 211 satisfies: α ≥ arctan ;
[0040] Where h is the distance between the outlet of the first oil leakage hole 111 and the outlet of the second oil leakage hole 211, d is the outlet diameter of the first oil leakage hole 111, and 1.5mm is the compensation amount obtained from the experiment.
[0041] Of course, in other embodiments, the compensation amount may also be adjusted according to the actual situation, which will not be listed here.
[0042] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the bottom of the volute 10 is provided with an oil drain port 11, which is embedded in the second oil drain hole 211, and the first oil drain hole 111 is provided through the inside.
[0043] By inserting the oil drain port 11 of the volute 10 into the oil drain column 21 of the sound-absorbing box 20, a physical nesting structure is formed, which can eliminate the gap at the connection of the two oil drain ports, improve the sealing performance, and avoid additional noise caused by air leakage.
[0044] Preferably, in some embodiments, the oil drain 11 is inclined inward along the air outlet direction to form a chamfer, so as to play a certain guiding role and facilitate insertion into the second oil drain hole 211.
[0045] In some embodiments, the oil drain 11 is located at the lowest end of the volute 10 to ensure that the oil in the volute 10 can flow out through the oil drain 11 as much as possible, thereby reducing the amount of oil residue in the volute 10.
[0046] Please combine Figure 4 as well as Figure 5 As shown, in some embodiments, the diameter D of the second oil leakage hole 211 and the outlet diameter d of the first oil leakage hole 111 satisfy: Dd≤2mm; by limiting the distance between the two oil leakage holes, the airflow can pass through the connection position of the two oil leakage holes without significant abrupt change in cross-sectional area, thereby reducing the vortex noise caused by the change in cross-sectional area of the airflow.
[0047] Preferably, in some embodiments, the distance between the second oil leakage hole 211 and the first oil leakage hole 111 at any position along the circumferential direction is less than or equal to 1 mm.
[0048] Please refer to Figure 1 As shown, in some embodiments, the oil mesh 30 has multiple through holes 32, and the edges of the through holes 32 are fixed with flanges 321 that protrude toward the side near the volute 10. The flanges 321 of two adjacent through holes 32 and the part of the top surface of the oil mesh 30 located between the two through holes 32 form an oil guide groove 31.
[0049] It is understandable that the oil guide groove 31 is naturally formed by the flange 321 of the through hole 32 and the top surface of the oil mesh 30, eliminating the need for additional oil guide parts and simplifying the manufacturing process.
[0050] Specifically, the through hole 32 is used to allow airflow to pass through, and the flange 321 can improve the structural strength of the oil mesh 30 on the one hand, and on the other hand, it can also constrain the flow direction of the oil and play a guiding role.
[0051] In some embodiments, the oil mesh 30 is L-shaped, with the vertical portion of the L-shape fixed to the back of the sound-absorbing box 20, and the horizontal portion extending downwards gradually along the axial direction of the volute 10.
[0052] Of course, in other embodiments, the oil mesh 30 and the oil guide groove 31 may also be other structures, as long as they can guide the oil dripping from the second oil leakage hole 211 to the final collection position, and the width S of the oil guide groove 31 meets the aforementioned requirements. This application will not give examples of each one here.
[0053] Please refer to Figure 1 As shown, in some embodiments, the height of the flange 321 forming the oil guide groove 31 gradually increases along the oil guiding direction of the oil guide groove 31 to accelerate the directional flow of oil to the outlet of the oil guide groove 31.
[0054] Please refer to Figure 2As shown, in some embodiments, the volute 10 and the sound-absorbing box 20 have corresponding sound-absorbing holes, and the sound-absorbing cotton is in a compressed state and completely adheres to the volute 10.
[0055] By compressing the sound-absorbing cotton through the sound-absorbing box 20 and the volute 10, the compressed sound-absorbing cotton completely adheres to and fills the physical gap between the volute 10 and the sound-absorbing box 20, blocking the leakage path of sound waves through the gap. On the one hand, this prevents noise from escaping from the edge of the sound-absorbing structure, thereby significantly reducing the noise of the volute 10. On the other hand, it also reduces airflow leakage inside the volute 10, reducing the efficiency loss of the fan.
[0056] In addition, the sound-absorbing cotton is completely attached to the volute 10, which ensures that the airflow enters the deep layer of the sound-absorbing cotton directly after passing through the sound-absorbing holes of the volute 10, rather than being reflected on the surface, thus significantly improving the sound energy dissipation efficiency of the sound-absorbing material.
[0057] Preferably, in some embodiments, the opening diameter of the sound-absorbing holes on the volute 10 is 2.5 mm, and the hole spacing is 8 mm. The porosity is 7.6%. Within this parameter range, the volute oil-guiding structure of this application has a good sound absorption effect.
[0058] In some embodiments, the sound-absorbing cotton is polyurethane sound-absorbing cotton, and the compression amount of the polyurethane sound-absorbing cotton is 10% to 20%.
[0059] It is easy to understand that if the compression is too small, it will not meet the minimum deformation requirement for eliminating gaps. Conversely, if the compression is too large, it will affect the sound absorption performance of the sound-absorbing cotton. Controlling the compression between 10% and 20% can balance the needs of gap control and sound absorption performance.
[0060] Preferably, in some embodiments, the height of the polyurethane sound-absorbing cotton in the uncompressed state is 15mm, and the height of the polyurethane sound-absorbing cotton in the compressed state is 13mm.
[0061] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the sound-absorbing box 20 is fixed to the bottom of the volute 10 around the outer peripheral surface of the volute 10, and three sets of fixing points 22 are provided along the circumferential direction. Two sets of fixing points 22 are provided at both ends of the sound-absorbing box 20 along the circumferential direction, and the other set of fixing points 22 and the oil leakage column 21 are respectively provided at both ends of the sound-absorbing box 20 along the axial direction of the volute 10.
[0062] The three sets of fixing points 22 form a triangular structure, which can significantly increase the fixing strength between the sound-absorbing box 20 and the volute 10, thereby avoiding the deformation of the sound-absorbing box 20 due to the elasticity of the sound-absorbing cotton, which would lead to gaps between the sound-absorbing box 20 and the volute 10.
[0063] Preferably, in some embodiments, there are two sets of fixing points 22 located at both ends in the circumferential direction, each set of fixing points 22 including two fixing points 22 at both ends along the axis of the volute 10.
[0064] In some embodiments, each fixing point 22 is fixed to the volute 10 by bolts; of course, in other embodiments, other commonly used fixing structures can also be used between the sound-absorbing box 20 and the volute 10, which will not be listed here.
[0065] 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.
[0066] 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. A volute oil guide structure characterized by comprising: include The volute (10) has a first oil leakage hole (111) at the bottom. The sound-absorbing box (20) is fixed to the bottom of the volute (10) and has an oil-leaking column (21) inside. A second oil-leaking hole (211) is opened through the oil-leaking column (21) and one end is connected to the first oil-leaking hole (111). The sound-absorbing box (20) is also provided with sound-absorbing cotton. The oil mesh (30) is fixed relative to the sound-absorbing box (20) and located at the bottom of the sound-absorbing box (20). The oil mesh (30) forms an oil guide groove (31) corresponding to the second oil leakage hole (211). The width S of the oil guide groove (31) satisfies: S≥D+2H×tanα; Wherein, D is the diameter of the second oil leakage hole (211), H is the distance from the center point of the outlet of the second oil leakage hole (211) to the bottom wall of the oil guide groove (31) along the axial direction of the second oil leakage hole (211), and α is the airflow expansion angle at the outlet of the second oil leakage hole (211).
2. The scroll guide structure according to claim 1, wherein The gas flow expansion angle a at the outlet of the second oil drain hole (211) satisfies: a ≥ arctan ; Where h is the distance between the outlet of the first oil leakage hole (111) and the outlet of the second oil leakage hole (211), and d is the outlet diameter of the first oil leakage hole (111).
3. The scroll guide structure according to claim 1, wherein The bottom of the volute (10) is provided with an oil leak port (11), which is embedded in the second oil leak hole (211) and the first oil leak hole (111) is provided through the inside.
4. The scroll guide structure according to claim 3, wherein The diameter D of the second oil leakage hole (211) and the outlet diameter d of the first oil leakage hole (111) satisfy: Dd≤2mm.
5. The scroll guide structure according to claim 1, wherein The oil mesh (30) has multiple through holes (32), and the edges of the through holes (32) are fixed with flanges (321) that protrude toward the side of the volute (10). The flanges (321) of two adjacent through holes (32) and the part of the top surface of the oil mesh (30) between the two through holes (32) form the oil guide groove (31).
6. The scroll guide structure according to claim 5, wherein The height of the flange (321) forming the oil guide groove (31) gradually increases along the oil guide direction of the oil guide groove (31).
7. The scroll guide structure according to claim 1, wherein The volute (10) and the sound-absorbing box (20) have corresponding sound-absorbing holes, and the sound-absorbing cotton is in a compressed state and is completely attached to the volute (10).
8. The scroll guide structure according to claim 7, wherein The sound-absorbing cotton is polyurethane sound-absorbing cotton, and the compression amount of the polyurethane sound-absorbing cotton is 10%~20%.
9. The scroll guide structure according to claim 7, wherein The sound-absorbing box (20) is fixed to the bottom of the volute (10) around the outer circumferential surface of the volute (10), and three sets of fixing points (22) are provided along the circumferential direction. Two sets of fixing points (22) are provided at both ends of the sound-absorbing box (20) along the circumferential direction, and the other set of fixing points (22) and the oil leakage column (21) are respectively provided at both ends of the sound-absorbing box (20) along the axial direction of the volute (10).
10. A range hood characterized by, It includes the volute oil guiding structure as described in any one of claims 1 to 9.