Pit type volute, centrifugal fan and range hood
By setting pits on the volute ring wall and equipping it with sound-absorbing components, the flow of the near-wall boundary layer is disrupted, forming turbulence. This solves the problem of poor noise reduction effect of existing volutes and achieves better noise reduction and fan performance.
Patent Information
- Application Number
- CN202520454587.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2035-03-14
AI Technical Summary
Existing volute designs are insufficient in noise reduction, especially those with uniform aperture arrays, which cannot effectively disrupt near-wall boundary layer flow, resulting in high air resistance, increased vibration, and noise.
The design employs a recessed volute, with recesses on the volute ring wall and sound-absorbing components. Turbulence is generated through the recesses to disrupt the boundary layer flow near the wall, reducing the intensity of airflow impact on the volute and lowering vibration and noise.
It achieves better noise reduction, reduces the impact of high-speed airflow on the volute, lowers the noise level, and maintains airflow and static pressure performance.
Smart Images
Figure CN223854508U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of fan technology, and in particular to a recessed volute, a centrifugal fan, and a range hood. Background Technology
[0002] The core power system of range hoods generally uses a centrifugal fan system, and the volute, as the core component of the fan system, directly affects the noise and airflow performance of the range hood. The noise of a range hood during operation is mainly generated by the separation and impact of airflow on the high-speed rotating impeller and the volute. Currently, the optimization of the volute mainly focuses on its shape and profile design.
[0003] Although some noise reduction solutions involve creating several noise-reducing holes in the volute, existing volute noise reduction measures are still relatively poor. Volute perforation solutions are limited to straight hole designs, resulting in poor noise reduction performance. For example, volute perforation solutions using a uniform aperture array design only involve the perforation diameter, perforation spacing, and perforation rate of the volute annular wall. Typically, a single aperture size and perforation spacing are determined while ensuring a certain perforation rate, and noise-reducing sound-absorbing cotton is used on the outside of the volute to guarantee the noise reduction level.
[0004] However, when the airflow in the volute rotates out of the impeller and impacts the volute wall at high speed, a boundary layer of a certain thickness is formed on the surface of the volute wall. The straight holes on the volute cannot disrupt this boundary layer flow, resulting in greater air resistance and causing the high-speed airflow to impact the volute, generating greater vibration and noise. Utility Model Content
[0005] Based on this, it is necessary to address the problem that the volute perforation scheme using a uniform aperture array design has limited actual noise reduction effect due to neglecting the airflow state inside the volute. This application provides a recessed volute, a centrifugal fan, and a range hood, which can disrupt the boundary layer flow near the wall and achieve better noise reduction effect.
[0006] According to one aspect of this application, one embodiment provides a recessed volute, comprising:
[0007] Front cover with air inlet;
[0008] The rear cover plate is arranged at a distance from the front cover plate;
[0009] A volute annular wall, wherein the volute annular wall is disposed between the front cover plate and the rear cover plate to form an air outlet communicating with the air inlet, and the volute annular wall has a plurality of recesses arranged at intervals; and
[0010] The sound-absorbing component is disposed on the outside of the volute ring wall and covers the recess.
[0011] In an embodiment of the present application, the recess has a profiled groove recessed outwardly from an inner wall of the volute ring wall.
[0012] In an embodiment of the present application, a bottom of the profiled groove is convex outwardly from an outer wall of the volute ring wall.
[0013] In an embodiment of the present application, a lip edge and / or a bottom edge of the profiled groove has a rounded corner structure.
[0014] In an embodiment of the present application, the recess further has a through hole opened in the bottom of the profiled groove and having a size smaller than a size of the lip.
[0015] In an embodiment of the present application, the through hole and the profiled groove are coaxially arranged, and a diameter of the through hole is smaller than a diameter of the lip of the profiled groove.
[0016] In an embodiment of the present application, the recesses are arranged in a staggered manner or uniformly on the volute ring wall.
[0017] In an embodiment of the present application, the recesses are arranged in segments on the volute ring wall.
[0018] According to another aspect of the present application, an embodiment of the present application further provides a centrifugal fan, comprising:
[0019] the recessed volute as described above; and
[0020] a impeller rotatably arranged in the recessed volute.
[0021] According to another aspect of the present application, an embodiment of the present application further provides an extractor hood, comprising:
[0022] a hood body; and
[0023] the centrifugal fan as described above arranged in the hood body.
[0024] In summary, compared with a volute provided with a straight hole, the recessed volute of the present application can destroy the near-wall boundary layer flow on the volute ring wall to form a turbulent flow by arranging recesses on the volute ring wall, so that the airflow forms a vortex in the recess and dissipates, thereby reducing the strength of the high-speed airflow impacting the volute ring wall, further reducing the vibration and noise generated by the impact, and achieving a better noise reduction effect. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 a structure schematic view of the extractor hood of an embodiment of the present application;
[0026] Figure 2A perspective view of a sump volute according to the above embodiments of the present application is shown;
[0027] Figure 3 An exploded view of a sump volute according to the above embodiments of the present application is shown;
[0028] Figure 4 A first example of a volute ring wall in a sump volute according to the above embodiments of the present application is shown;
[0029] Figure 5 A top view of the volute ring wall according to the above first example of the present application is shown;
[0030] Figure 6 A cross-sectional view of the volute ring wall shown at A-A is shown; Figure 5 A cross-sectional view of the volute ring wall shown at B-B is shown;
[0031] Figure 7 A schematic view of the principle of sump distribution in a volute ring wall according to the above embodiments of the present application is shown;
[0032] Figure 8 A second example of a volute ring wall in a sump volute according to the above embodiments of the present application is shown;
[0033] Figure 9 A cross-sectional view of the volute ring wall shown at B-B is shown; Figure 8 A cross-sectional view of the volute ring wall shown at B-B is shown;
[0034] Figure 10 A third example of a volute ring wall in a sump volute according to the above embodiments of the present application is shown;
[0035] Figure 11 A fourth example of a volute ring wall in a sump volute according to the above embodiments of the present application is shown.
[0036] Explanation of main element symbols:
[0037] 1. Sump volute; 10. Front cover plate; 100. Air inlet; 20. Rear cover plate; 200. Air outlet; 30. Volute ring wall; 300. Sump; 301. Profiling groove; 302. Through hole; 31. Volute tongue section; 32. Outlet section; 33. Ring wall section; 330. Oil leakage hole; 331. Lower ring wall area; 332. Volute tongue ring wall area; 40. Sound absorption assembly; 41. Ring wall sound absorption box; 42. Cover plate sound absorption box; 2. Impeller; 3. Hood.
[0038] The above explanation of main element symbols, together with the accompanying drawings and detailed description, further explain the present application in detail. DETAILED DESCRIPTION
[0039] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application, and it is understood that similar changes in form and substance can be made by those skilled in the art without departing from the spirit and scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.
[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0041] In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes and should not be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.
[0042] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0043] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a mediating element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there can be a mediating element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only implementation.
[0044] Considering that the centrifugal fan in the current range hood mainly reduces noise through the optimization of the volute by the design of the volute shape and profile, although some noise reduction schemes will open several noise reduction holes on the volute, these noise reduction holes are usually single-aperture straight holes, and the straight holes cannot break the near-wall boundary layer flow, resulting in large air resistance, causing greater vibration and noise generated by the impact of high-speed airflow on the volute. Therefore, the application provides a pit type volute, a centrifugal fan and a range hood, which can break the near-wall boundary layer flow and achieve better noise reduction effect.
[0045] Specifically, referring to the accompanying drawings Figures 1 to 3 An embodiment of the application provides a range hood, which can include a range hood box 3 and a centrifugal fan arranged in the range hood box 3. The centrifugal fan includes a pit type volute 1 mounted on the range hood box 3 and an impeller 2 rotatably arranged in the pit type volute 1 to generate negative pressure when the impeller 2 rotates relative to the pit type volute 1, thereby achieving the effect of absorbing oil smoke. It can be understood that the range hood mentioned in the application can include but is not limited to fan cavities, smoke collecting cavities and / or oil cups and other components in addition to the centrifugal fan, which will not be described here.
[0046] More specifically, as shown in the drawings Figures 2 to 11 The pit type volute 1 can include a front cover plate 10 with an air inlet 100, a rear cover plate 20 arranged in a spaced manner with the front cover plate 10, a volute ring wall 30 and a sound absorption assembly 40. The volute ring wall 30 is arranged between the front cover plate 10 and the rear cover plate 20 to form an air outlet 200 communicating with the air inlet 100; and the volute ring wall 30 is provided with a plurality of pits 300 arranged in a spaced manner. The sound absorption assembly 40 is arranged outside the volute ring wall 30 and covers the pits 300. It can be understood that the rear cover plate 20 mentioned in the application can be provided with an air inlet to form a double-suction fan, or it can not be provided with an air inlet to form a single-suction fan, which will not be described here.
[0047] It is worth noting that compared with the volute provided with straight holes, the pit type volute 1 of the application can break the near-wall boundary layer flow on the volute ring wall 30 to form turbulent flow by arranging pits 300 on the volute ring wall 30, so that the airflow forms a vortex in the pit 300 and dissipates, thereby reducing the strength of the high-speed airflow impacting the volute ring wall 30, thereby reducing the vibration and noise generated by the impact, and achieving better noise reduction effect.
[0048] Exemplarily, in the first example of the application, as shown in the drawings Figures 4 to 6As shown, the recess 300 has a profiled groove 301 recessed outward from the inner wall of the volute ring wall 30, so that the near-wall airflow on the volute ring wall 30 can flow into the profiled groove 301 to form a vortex and dissipate, so as to effectively destroy the near-wall boundary layer flow to form a turbulent flow, achieving a better noise reduction effect.
[0049] Optionally, as shown in Figure 5 and Figure 6 , the groove bottom of the profiled groove 301 is convex outward from the outer wall of the volute ring wall 30, so as to increase the sound absorption area on the outside of the volute ring wall 30, further improving the noise reduction effect.
[0050] Optionally, the diameter d of the profiled groove 301 is between 0mm and 10mm; the depth h of the profiled groove 301 is between 0mm and 2mm.
[0051] Optionally, as shown in Figure 6 , the groove edge of the profiled groove 301 has a rounded corner structure, so as to reduce the airflow resistance at the groove and better guide the airflow into the profiled groove 301.
[0052] Optionally, as shown in Figure 6 , the groove bottom edge of the profiled groove 301 has a rounded corner structure, so as to reduce the airflow resistance in the groove and better guide the airflow to form a vortex in the profiled groove 301.
[0053] It is worth noting that in the first example of the present application, the recess 300 on the volute ring wall 30 is implemented as a blind hole, which can avoid the airflow flowing out of the volute through the recess 300, and is beneficial to reduce the wind volume, static pressure and efficiency reduction caused by the perforation of the volute. However, in other examples of the present application, the recess 300 on the volute ring wall 30 can be implemented as a perforation, at which time the presence of the recess 300 also increases the sound absorption area on the volute ring wall 30 corresponding to the sound absorption assembly 40, increasing the noise reduction effect caused by the perforation.
[0054] Specifically, as shown in Figure 8 and Figure 9 , compared with the above-mentioned first example according to the present application, the difference between the volute ring wall 30 of the second example according to the present application is that the recess 300 further has a through hole 302 opened in the groove bottom of the profiled groove 301 and smaller in size than the groove opening, to form a recessed perforation, which can make the airflow form a vortex in the profiled groove 301 while discharging a part of the airflow to the sound absorption assembly 40 through the through hole 302, to obtain a better noise reduction effect. It can be understood that in the second example of the present application, the recess 300 can be made by outwardly profiling the part of the volute ring wall 30 with the through hole 302.
[0055] More specifically, as shown in Figure 9As shown, the through hole 302 is coaxially arranged with the profiling groove 301, and the diameter of the through hole 302 is smaller than the slot diameter of the profiling groove 301, so as to reduce the processing difficulty.
[0056] According to the above embodiments of the present application, as Figures 4 to 7 As shown, the recesses 300 are staggered on the volute ring wall 30, so that the recesses 300 can cover a larger actual sound absorption area at the same radiation radius, thereby balancing the air volume performance at the same perforation rate, and achieving better noise reduction effect. It can be understood that in other embodiments of the present application, the recesses 300 can also be uniformly arranged on the volute ring wall 30.
[0057] It is worth noting that the staggered arrangement mentioned in the present application refers to the staggered arrangement of any two adjacent rows of recesses 300, so that any two adjacent recesses 300 are not on the same horizontal line. In addition, the width direction of the volute ring wall 30 (corresponding to the axial direction of the recessed volute 1) can be defined as the horizontal direction (corresponding to the row of the recess 300), and the length direction of the volute ring wall 30 (corresponding to the circumferential direction of the recessed volute 1) can be defined as the vertical direction (corresponding to the column of the recess 300). Of course, in other embodiments of the present application, the width direction and the length direction of the volute ring wall 30 can also correspond to the column of the recess 300 and the row of the recess 300 respectively, and the present application will not be repeated here.
[0058] Optionally, as shown in Figure 5 and Figure 7 As shown, each row of recesses 300 on the volute ring wall 30 is distributed along a fish-scale-shaped broken line, so that all the recesses 300 achieve staggered arrangement.
[0059] Optionally, as shown in Figure 7 As shown, the recesses 300 in the same column are arranged equidistantly along the length direction of the volute ring wall 30, so that the column spacing Lx of the recesses 300 remains the same, so as to reduce the processing difficulty and improve the processing convenience. It can be understood that the column spacing mentioned in the present application refers to the center spacing of two adjacent recesses 300 along the horizontal direction.
[0060] Optionally, as shown in Figure 7 As shown, the row spacing Ly of the recesses 300 is equal to the column spacing Lx of the recesses 300, so that the processing difficulty is further reduced and the processing convenience is improved. It can be understood that the row spacing mentioned in the present application refers to the center spacing of two adjacent recesses 300 along the vertical direction.
[0061] Preferably, as shown in Figure 7As shown, any three adjacent pits 300 are distributed in a right triangle shape, so that each pit 300 is located at the bending of the fish scale-shaped fold line, so as to increase the bending times of the fish scale-shaped fold line, and facilitate covering a larger actual sound absorption area under the same radiation radius. It can be understood that in other examples of the present application, some pits 300 can also be located on the straight line segment of the fish scale-shaped fold line.
[0062] It is worth noting that in other examples of the present application, each row of pits 300 on the volute ring wall 30 can be distributed along a wavy line or randomly, as long as all the pits 300 are staggered. For example, each row of pits 300 on the volute ring wall 30 is distributed along a sinusoidal function curve, which ensures that any two adjacent pits 300 are not on the same horizontal line. It can be understood that the present application can control the shape, period and displacement of the wavy line by controlling the amplitude, angular frequency and initial phase of the sinusoidal function, and then the sinusoidal function curve along the circumferential and / or axial direction of the volute ring wall 30 can be obtained by translation, so that the pits 300 are arranged along the sinusoidal function curve. In addition, in other examples of the present application, each column of pits 300 on the volute ring wall 30 is also distributed along a sinusoidal function curve, so as to further cover a larger actual sound absorption area.
[0063] According to the above embodiments of the present application, as shown in Figures 3 to 5 The pits 300 are arranged in sections on the volute ring wall 30, so as to adapt to the internal flow field distribution characteristics of the volute while reducing the configuration of the external sound absorption assembly 40 and reducing the opening rate and processing cost.
[0064] Exemplarily, in the above first example of the present application, as shown in Figure 4 and Figure 5 The volute ring wall 30 can include a volute tongue segment 31, an outlet segment 32 arranged in a spaced manner with the volute tongue segment 31 to form the air outlet 200, and a ring wall segment 33 curvedly extending from the volute tongue segment 31 to the outlet segment 32. The lowest part of the ring wall segment 33 of the volute ring wall 30 is provided with an oil drain hole 330, so that the oil accumulated on the volute ring wall 30 flows to the lowest part of the ring wall segment 33 under the action of its own gravity, and flows out from the oil drain hole 330.
[0065] Optionally, as shown in Figure 3 and Figure 5 The oil drain hole 330 is located on one side of the ring wall segment 33 close to the rear cover plate 20, so that the oil drain hole 330 can be aligned with the rear-arranged smoke collecting cavity, so as to flow into the oil cup at the bottom of the smoke collecting cavity.
[0066] Optionally, as shown in Figure 3 and Figure 5As shown, the ring wall section 33 has a lower ring wall area 331 arranged spaced apart from the outlet section 32 and adjacent to the oil leakage hole 330, and a volute tongue ring wall area 332 arranged spaced apart from the lower ring wall area 331 and adjacent to the volute tongue section 31; the lower ring wall area 331 and the volute tongue ring wall area 332 are respectively provided with the staggered arrangement of the recesses 300, so as to segmentally open according to the characteristics of the internal flow field distribution of the volute, thereby reducing the opening rate and processing cost. It can be understood that, since the noise will not be significantly reduced when the opening rate reaches a certain degree, and a smaller opening rate will also reduce the wind volume, static pressure and efficiency caused by the opening, therefore, according to the trade-off of the wind volume, static pressure, efficiency and noise performance requirements of the range hood and the fan, the appropriate opening rate can be selected while taking into account the lower processing cost.
[0067] Optionally, as shown in Figure 2 and Figure 3 , the sound absorption assembly 40 includes a pair of ring wall sound absorption boxes 41 respectively covered on the lower ring wall area 331 and the volute tongue ring wall area 332, so as to form a sound absorption cavity on the outside of the volute ring wall 30 and communicate with the recesses 300, without covering all areas of the volute ring wall 30, which is beneficial to reduce the configuration of the sound absorption box and facilitate cost reduction. It can be understood that the sound absorption box mentioned in the present application can be made of sound absorption cotton, or can be implemented as a box filled with sound absorption cotton, which will not be described here.
[0068] It is worth noting that, in the third example of the present application, as shown in Figure 10 , all the recesses 300 are arranged in the lower ring wall area 331 of the volute ring wall 30; and the sound absorption assembly 40 only includes one ring wall sound absorption box 41 covered on the lower ring wall area 331, so as to further reduce the configuration of the sound absorption box and reduce the cost.
[0069] In the fourth example of the present application, as shown in Figure 11 , the outlet section 32 of the volute ring wall 30 is also provided with the staggered arrangement of the recesses 300, so as to reduce the noise at the outlet of the volute and achieve a better noise reduction effect.
[0070] In addition, in the above-mentioned embodiments of the present application, as shown in Figure 2 and Figure 3 , the sound absorption assembly 40 can further include a pair of cover plate sound absorption boxes 42 covered on the outside of the front cover plate 10 and the rear cover plate 20, so as to absorb the noise generated at the front cover plate 10 and the rear cover plate 20, and further improve the noise reduction effect.
[0071] It is worth noting that, in other examples of the present application, the recesses 300 can be arranged on all areas of the volute ring wall 30 except the volute tongue section 31, which will not be described here.
[0072] Any combination of the technical features in the above embodiments can be made. For the sake of brevity, the foregoing description has not described all possible combinations of the technical features in the above embodiments. However, it is understood that any combination of the technical features that does not cause a contradiction shall be considered within the scope of the present disclosure.
[0073] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the application. It should be noted that, for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application.
Claims
1. A pit-type volute, characterized by, Comprising: a front cover plate having an air inlet; a rear cover plate arranged in spaced apart relation to the front cover plate; a volute ring wall, wherein the volute ring wall is disposed between the front cover plate and the rear cover plate to form an air outlet in communication with the air inlet, and the volute ring wall is provided with a plurality of recesses arranged in spaced apart relation; and a sound absorption assembly disposed outside the volute ring wall and covering the recesses.
2. The pit-type volute according to claim 1, characterized by, The recesses have a profiled groove recessed outwardly from an inner wall of the volute ring wall.
3. The pit-type volute according to claim 2, characterized by, A groove bottom of the profiled groove is convexly outwardly from an outer wall of the volute ring wall.
4. The pit-type volute according to claim 2, characterized by, The groove opening edge and / or the groove bottom edge of the profiled groove has a rounded corner structure.
5. The pit-type volute according to claim 2, characterized by, The recesses further have a through hole provided in the groove bottom of the profiled groove and having a size smaller than that of the groove opening.
6. The pit-type volute according to claim 5, characterized by The through hole and the profiled groove are coaxially arranged, and the diameter of the through hole is smaller than that of the groove opening of the profiled groove.
7. The pit-type volute according to any one of claims 1 to 6, characterized by The recesses are arranged in staggered or uniform manner on the volute ring wall.
8. The pit-type volute according to any one of claims 1 to 6, characterized by The recesses are arranged in segmented manner on the volute ring wall.
9. A centrifugal fan, characterized by Comprising: the recessed volute of any one of claims 1 to 8; and an impeller rotatably disposed within the recessed volute.
10. A range hood characterized by Comprising: a range hood box; and the centrifugal fan of claim 9 disposed within the range hood box.