Staggered perforated volute, centrifugal fan and range hood
By combining staggered perforated volutes with sound-absorbing components, the problem of limited noise reduction caused by uneven airflow distribution inside the volutes is solved, achieving better noise reduction and airflow performance.
Patent Information
- Application Number
- CN202520461733.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-14
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-14
AI Technical Summary
Existing volute perforation solutions ignore the airflow state inside the volute, resulting in limited noise reduction effect. Furthermore, the volute perforation design is simplistic and has poor noise reduction performance.
The design adopts a staggered perforated volute, with multiple perforations arranged in a staggered pattern on the volute ring wall. Sound-absorbing components are set on the outer side of the volute ring wall. The perforations on the volute ring wall are distributed along fish-scale-like broken lines, sine function curves, or randomly, forming a sound-absorbing cavity in combination with the sound-absorbing components.
While maintaining airflow performance, it achieves better noise reduction, reducing noise by 0.5dB.
Smart Images
Figure CN223825311U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of fan, in particular to a staggered perforated volute, centrifugal fan and range hood. BACKGROUND
[0002] The core power system of the range hood generally adopts a centrifugal fan system, and the volute as the core component of the fan system directly affects the noise and air volume performance of the range hood. The noise of the range hood during operation is mainly caused 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 the shape and profile design of the volute.
[0003] Although some noise reduction schemes provide a plurality of noise reduction holes on the volute, the existing noise reduction measures of the volute are relatively poor, and the perforation scheme of the volute is still limited to a single aperture array design, which has poor noise reduction effect. For example, the perforation scheme of the volute with a uniform aperture array design only involves the perforation diameter, perforation spacing and perforation rate of the volute ring wall. Generally, a single aperture size and hole spacing size are determined under the condition of ensuring a certain perforation rate, and noise reduction sound-absorbing cotton is used outside the volute to ensure the noise reduction level.
[0004] However, the distribution of airflow in the volute is highly uneven, and the velocity distribution of the volute tongue ring wall and other regions also differs greatly. Uniform arrangement mainly considers processing convenience, and ignores the airflow flow state in the volute, resulting in limited actual noise reduction effect. CONTENT OF THE INVENTION
[0005] Therefore, it is necessary to solve the problem of limited actual noise reduction effect caused by ignoring the airflow flow state in the volute due to the perforation scheme of the volute with a uniform aperture array design. The present application provides a staggered perforated volute, centrifugal fan and range hood, which can achieve better noise reduction effect while considering the air volume performance.
[0006] According to an aspect of the present application, one embodiment of the present application provides a staggered perforated volute, comprising:
[0007] a front cover plate having an air inlet;
[0008] a rear cover plate arranged in a spaced manner with the front cover plate;
[0009] a volute ring wall, wherein the volute ring wall is arranged between the front cover plate and the rear cover plate to form an air outlet communicating with the air inlet, and a plurality of perforations arranged in a staggered manner are provided on the volute ring wall; and
[0010] a sound-absorbing assembly arranged on the outer side of the volute ring wall and covering the perforations.
[0011] In one embodiment of the present application, the perforations in each row on the volute ring wall are distributed along a fish-scale-like zigzag line.
[0012] In one embodiment of the present application, the perforations in the same column are arranged equidistantly along the length direction of the volute ring wall; the row spacing of the perforations is equal to the column spacing of the perforations.
[0013] In one embodiment of the present application, any three adjacent perforations are distributed in a slanting triangle shape.
[0014] In one embodiment of the present application, the perforations in each row on the volute ring wall are distributed along a wavy line; the perforations in each row on the volute ring wall are distributed along a sinusoidal function curve.
[0015] In one embodiment of the present application, all the perforations on the volute ring wall are randomly distributed.
[0016] In one embodiment of the present application, the volute ring wall comprises a volute tongue section, an outlet section arranged spaced apart from the volute tongue section to form the air outlet, and a ring wall section extending from the volute tongue section to the outlet section in a curved manner; the lowest point on the ring wall section is provided with an oil leakage hole, and the oil leakage hole is located on a side of the ring wall section close to the back cover plate; the ring wall section has a lower ring wall area arranged spaced apart from the outlet section and adjacent to the oil leakage hole, and a volute tongue ring wall area arranged spaced apart from the lower ring wall area and adjacent to the volute tongue section; the lower ring wall area and / or the volute tongue ring wall area is provided with the perforations arranged in a staggered manner.
[0017] In one embodiment of the present application, the sound absorption assembly comprises a ring wall sound absorption box covering the lower ring wall area and / or the volute tongue ring wall area, so as to form a sound absorption cavity on the outside of the volute ring wall and in communication with the perforations.
[0018] According to another aspect of the present application, one embodiment of the present application further provides a centrifugal fan, comprising:
[0019] The staggered perforated volute described in any of the above; and
[0020] An impeller rotatably arranged in the staggered perforated volute.
[0021] According to another aspect of the present application, one embodiment of the present application further provides an extractor hood, comprising:
[0022] An extractor hood box; and
[0023] The centrifugal fan described above is arranged in the extractor hood box.
[0024] In summary, compared with the perforated uniform array arrangement volute, since the staggered perforated volute of the present application utilizes staggered arrangement of perforations to cover a larger actual sound absorption area at the same radiation radius, the staggered perforated volute of the present application can take into account the air volume performance at the same perforation rate, and achieve better noise reduction effect. For example, through sample test verification: for the semi-muffler noise and working noise of the range hood, the staggered perforated volute of the present application reduces the noise by about 0.5dB compared with the perforated uniform array arrangement volute under the same air volume. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 Structure schematic diagram of the range hood of one embodiment of the present application;
[0026] Figure 2 The three-dimensional schematic diagram of the staggered perforated volute in the range hood of the above embodiment of the present application is shown;
[0027] Figure 3 The exploded schematic diagram of the staggered perforated volute of the above embodiment of the present application is shown;
[0028] Figure 4 The cross-sectional schematic diagram of the staggered perforated volute of the above embodiment of the present application is shown;
[0029] Figure 5 The first example of the volute ring wall in the staggered perforated volute according to the above embodiment of the present application is shown;
[0030] Figure 6 The A-A cross-sectional schematic diagram of the volute ring wall according to the above first example of the present application is shown;
[0031] Figure 7 The principle schematic diagram of the perforation distribution in the volute ring wall according to the above first example of the present application is shown;
[0032] Figure 8 The principle schematic diagram of the perforation distribution in the volute ring wall according to the second example of the present application is shown;
[0033] Figure 9 The third example of the volute ring wall in the staggered perforated volute of the above embodiment of the present application is shown.
[0034] Explanation of main element symbols:
[0035] 1. Staggered perforated volute; 10. Front cover plate; 100. Air inlet; 20. Rear cover plate; 200. Air outlet; 30. Volute ring wall; 300. Perforation; 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 component; 41. Ring wall sound absorption box; 42. Cover plate sound absorption box; 2. Impeller; 3. Range hood box.
[0036] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a further detailed explanation of this application. Detailed Implementation
[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application 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 application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "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 based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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 application.
[0039] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0040] In this application, unless otherwise expressly 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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0041] 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.
[0042] Currently, centrifugal fans in range hoods primarily reduce noise through volute shape and profile design optimization. While some noise reduction solutions incorporate several noise-reducing holes in the volute, these holes are typically arranged with a uniform single diameter, resulting in poor noise reduction performance. Therefore, this application provides a staggered perforated volute, a centrifugal fan, and a range hood that achieves better noise reduction while maintaining airflow performance.
[0043] Specifically, see the attached document. Figures 1 to 4 As shown, one embodiment of this application provides a range hood, which may include a range hood housing 3 and a centrifugal fan disposed within the range hood housing 3. The centrifugal fan includes a staggered perforated volute 1 installed in the range hood housing 3 and an impeller 2 rotatably disposed within the staggered perforated volute 1, so as to generate negative pressure when the impeller 2 rotates relative to the staggered perforated volute 1, thereby achieving the effect of absorbing cooking fumes. It is understood that the range hood housing mentioned in this application may include, but is not limited to, components such as a fan chamber, a smoke collection chamber, and / or an oil cup, in addition to the centrifugal fan; these will not be elaborated further in this application.
[0044] More specifically, such as Figures 2 to 6As shown, the staggered perforated volute 1 may include a front cover plate 10 with an air inlet 100, a rear cover plate 20 spaced apart from the front cover plate 10, a volute annular wall 30, and a sound-absorbing component 40. The volute annular wall 30 is disposed 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 a plurality of staggered perforations 300 are formed on the volute annular wall 30. The sound-absorbing component 40 is disposed on the outside of the volute annular wall 30 and covers the perforations 300. It is understood that the rear cover plate 20 mentioned in this application may have an air inlet to make the centrifugal fan a double-suction fan, or it may not have an air inlet to make the centrifugal fan a single-suction fan, which will not be described in detail in this application.
[0045] It is worth noting that, compared to a volute with a uniform array of perforations, the staggered perforated volute 1 of this application, by utilizing the staggered arrangement of perforations 300, can cover a larger actual sound-absorbing area under the same radiation radius. Therefore, the staggered perforated volute 1 of this application can achieve better noise reduction while maintaining airflow performance under the same perforation rate. For example, after sample testing, it was verified that for the semi-anechoic chamber noise and operating noise of the range hood, the staggered perforated volute 1 of this application reduces noise by approximately 0.5 dB compared to a volute with a uniform array of perforations under the same airflow.
[0046] Furthermore, the staggered arrangement mentioned in this application refers to any two adjacent columns of perforations 300 being misaligned, such that any two adjacent perforations 300 are not on the same horizontal line. It is understood that this application defines the width direction of the volute annular wall 30 (corresponding to the axial direction of the staggered perforated volute 1) as the horizontal direction (corresponding to the row of perforations 300), and the length direction of the volute annular wall 30 (corresponding to the circumferential direction of the staggered perforated volute 1) as the vertical direction (corresponding to the column of perforations 300). Of course, in other embodiments of this application, the width and length directions of the volute annular wall 30 may also correspond to the column and row of perforations 300, respectively, which will not be elaborated further in this application.
[0047] Exemplarily, in the first example of this application, such as Figures 5 to 7 As shown, each row of perforations 300 on the volute ring wall 30 is distributed along a fish-scale-like zigzag pattern, so that all the perforations 300 are arranged in a staggered manner.
[0048] Optionally, such as Figure 6 and Figure 7 As shown, the perforations 300 in the same column are arranged at equal intervals along the length of the volute annular wall 30, so that the column spacing Lx of the perforations 300 remains the same, in order to reduce the processing difficulty and improve the processing convenience. It is understood that the column spacing mentioned in this application refers to the center-to-center distance between two adjacent perforations 300 along the horizontal direction.
[0049] Optionally, such as Figure 7 As shown, the row spacing Ly of the perforation 300 is equal to the column spacing Lx of the perforation 300, which further reduces the processing difficulty and improves processing convenience. It is understood that the row spacing mentioned in this application refers to the center-to-center distance between two adjacent perforations 300 along the vertical direction.
[0050] Preferably, such as Figure 6 and Figure 7 As shown, any three adjacent perforations 300 are arranged in an oblique triangle, such that each perforation 300 is located at the bend of the fish-scale zigzag line, thereby increasing the number of bends in the fish-scale zigzag line and thus covering a larger actual sound-absorbing area with the same radiation radius. It is understood that in other examples of this application, some perforations 300 may also be located on the straight segments of the fish-scale zigzag line.
[0051] It is worth noting that, attached Figure 8 A second example of a volute annular wall 30 according to this application is shown. The difference between the second example of the volute annular wall 30 and the first example described above according to this application lies in: Figure 8 As shown, each row of perforations 300 on the volute ring wall 30 is distributed along a wavy line, so that all the perforations 300 are staggered.
[0052] Optionally, such as Figure 8 As shown, each row of perforations 300 on the volute annular wall 30 is distributed along a sine function curve, ensuring that any two adjacent perforations 300 are not on the same horizontal line. It is understood that this application can control the shape, period, and displacement of the wavy line by controlling the amplitude, angular frequency, and initial phase of the sine function, and thus obtain a sine function curve along the circumferential and / or axial direction of the volute annular wall 30 through translation, so that the perforations 300 are arranged along the sine function curve. Furthermore, in other examples of this application, each column of perforations 300 on the volute annular wall 30 is also distributed along a sine function curve to further cover a larger actual sound-absorbing area.
[0053] It is worth noting that in other examples of this application, all the perforations 300 on the volute annular wall 30 can be randomly distributed to achieve a staggered perforation scheme while obtaining a non-uniformly distributed staggered perforated volute 1. It is understood that this application can define the positions on the volute annular wall 30 according to two-dimensional coordinates, set a certain perforation rate to obtain a certain number of random numbers, and then use software to randomly allocate the two-dimensional perforation positions, thereby obtaining a non-uniformly distributed staggered perforated volute.
[0054] According to the above embodiments of this application, as Figures 3 to 5As shown, the volute annular wall 30 includes a volute tongue section 31, an outlet section 32 spaced apart from the volute tongue section 31 to form the air outlet 200, and an annular wall section 33 extending curvedly from the volute tongue section 31 to the outlet section 32. An oil drain hole 330 is provided at the lowest point of the annular wall section 33 of the volute annular wall 30, allowing oil accumulated on the volute annular wall 30 to flow towards the lowest point of the annular wall section 33 under its own gravity and drain out through the oil drain hole 330.
[0055] Optionally, such as Figure 3 and Figure 5 As shown, the oil drain hole 330 is located on the side of the annular wall section 33 near the rear cover plate 20, so that the oil drain hole 330 can be aligned with the rear-arranged smoke collection chamber, so that the oil flows into the oil cup located at the bottom of the smoke collection chamber.
[0056] Optionally, such as Figure 3 and Figure 5 As shown, the annular wall section 33 has a lower annular wall region 331 spaced apart from the outlet section 32 and adjacent to the oil leakage hole 330, and a volute tongue annular wall region 332 spaced apart from the lower annular wall region 331 and adjacent to the volute tongue section 31. The lower annular wall region 331 and the volute tongue annular wall region 332 are respectively provided with staggered perforations 300, so as to segment the perforations according to the characteristics of the internal flow field distribution of the volute, thereby reducing the perforation ratio and processing cost. It is understood that since noise will not be significantly reduced when the perforation ratio reaches a certain level, and a smaller perforation ratio will reduce the decrease in airflow, static pressure, and efficiency caused by the perforations, this application can select an appropriate perforation ratio based on the trade-offs of airflow, static pressure, efficiency, and noise performance requirements of the range hood and fan design, while taking into account lower processing costs.
[0057] Optionally, such as Figures 2 to 4 As shown, the sound-absorbing assembly 40 includes a pair of annular wall sound-absorbing boxes 41 respectively covering the lower annular wall region 331 and the volute tongue annular wall region 332, to form a sound-absorbing cavity communicating with the perforation 300 on the outer side of the volute annular wall 30, without having to cover the entire area of the volute annular wall 30, which helps to reduce the configuration of sound-absorbing boxes and facilitates cost reduction. It is understood that the sound-absorbing boxes mentioned in this application can be made of sound-absorbing cotton, or can be implemented as a box filled with sound-absorbing cotton, which will not be described in detail in this application.
[0058] It is worth noting that in the third example of this application, such as Figure 9As shown, all the perforations 300 are formed in the lower annular wall region 331 of the volute annular wall 30; and the sound-absorbing assembly 40 includes only one annular wall sound-absorbing box 41 covering the lower annular wall region 331, so as to further reduce the configuration of sound-absorbing boxes and reduce costs. Of course, in other examples of this application, the outlet section 32 of the volute annular wall 30 may also have staggered perforations 300; the sound-absorbing assembly 40 further includes an annular wall sound-absorbing box 41 covering the outlet section 32, so as to reduce the noise at the volute outlet and achieve a better noise reduction effect.
[0059] Furthermore, in the above embodiments of this application, such as Figures 2 to 4 As shown, the sound-absorbing component 40 may further include a pair of cover plate sound-absorbing boxes 42 disposed on the outside of the front cover plate 10 and the rear cover plate 20 to absorb the noise generated at the front cover plate 10 and the rear cover plate 20, thereby further improving the noise reduction effect.
[0060] It is worth noting that in other examples of this application, the perforations 300 can be provided in all areas of the volute annular wall 30 except for the volute tongue segment 31, as long as the perforations 300 are arranged in a staggered manner. This application will not elaborate further on this.
[0061] 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.
[0062] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are quite specific and detailed. However, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.
Claims
1. A staggered perforated volute, characterized in that, include: Front cover with air inlet; The rear cover plate is arranged at a distance from the front cover plate; 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 is provided with a plurality of staggered perforations. as well as The sound-absorbing component is disposed on the outside of the volute ring wall and covers the perforation.
2. The staggered perforated volute according to claim 1, characterized in that, The perforations in each row on the volute ring wall are distributed along a fish-scale-like zigzag pattern.
3. The staggered perforated volute according to claim 2, characterized in that, The perforations in the same column are arranged at equal intervals along the length of the volute ring wall; the row spacing of the perforations is equal to the column spacing of the perforations.
4. The staggered perforated volute according to claim 2, characterized in that, Any three adjacent perforations are arranged in an oblique triangle.
5. The staggered perforated volute according to claim 1, characterized in that, The perforations in each row on the volute ring wall are distributed along a wavy line; the perforations in each row on the volute ring wall are distributed along a sine function curve.
6. The staggered perforated volute according to claim 1, characterized in that, All the perforations on the volute ring wall are randomly distributed.
7. The staggered perforated volute according to any one of claims 1 to 6, characterized in that, The volute annular wall includes a volute tongue section, an outlet section spaced apart from the volute tongue section to form the air outlet, and an annular wall section extending curvedly from the volute tongue section to the outlet section; an oil leakage hole is provided at the lowest point of the annular wall section, and the oil leakage hole is located on the side of the annular wall section near the rear cover plate; the annular wall section has a lower annular wall region spaced apart from the outlet section and adjacent to the oil leakage hole, and a volute tongue annular wall region spaced apart from the lower annular wall region and adjacent to the volute tongue section; the lower annular wall region and / or the volute tongue annular wall region have staggered perforations.
8. The staggered perforated volute according to claim 7, characterized in that, The sound-absorbing component includes an annular wall sound-absorbing box covering the lower annular wall region and / or the volute tongue annular wall region, to form a sound-absorbing cavity communicating with the perforation on the outside of the volute annular wall.
9. A centrifugal fan, characterized in that, include: The staggered perforated volute as described in any one of claims 1 to 8; and The impeller is rotatably disposed within the staggered perforated volute.
10. A range hood, characterized in that, include: Range hood enclosure; and The centrifugal fan as described in claim 9 is installed inside the fume hood box.