Fan and table-top range hood

Abstract

The utility model relates to kitchen electrical equipment technical field, concretely discloses fan and table type range hood, the fan includes volute and noise reduction subassembly, volute is provided with air outlet, and the side wall of air outlet is connected with volute tongue, the noise reduction subassembly is divided into at least two sub air ducts with air outlet, and the direction from the side wall of volute tongue connected with air outlet to the other side wall opposite volute tongue, at least two sub air ducts are sequentially arranged. When the fan works, the airflow with high speed and strong periodic pulsation flows from the impeller area to the air outlet of volute, because the noise reduction subassembly divides the air outlet into at least two sub air ducts, and then makes the originally concentrated, large-scale air outlet airflow to be divided into multiple independent airflow with smaller scale, brings the effect of turbulence suppression and pulsation attenuation, makes the airflow flow more tends to laminarization and homogenization, and then effectively reduces the noise at the air outlet of fan.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to fans and tabletop range hoods. Background Technology

[0002] As modern kitchen appliances evolve towards a balance between high performance and comfort, noise control has become a crucial technical indicator for evaluating the overall performance of countertop range hoods. In practical applications, consumers demand that equipment operate quietly while efficiently extracting cooking fumes. Research indicates that the centrifugal fan system, as the core power unit of a countertop range hood, directly impacts the overall acoustic performance of the unit due to its flow-induced noise characteristics. Particularly during high-airflow operation, traditional fan structures exhibit significant discrete noise peaks in the volute outlet area under high-speed conditions, becoming a key technical bottleneck restricting product upgrades.

[0003] From an aeroacoustic perspective, this discrete noise primarily originates from the periodic disturbance effect of the impeller-volute coupling system. Specifically, the high-speed rotating impeller blades periodically disturb the airflow in the volute tongue region, and its characteristic frequency is closely related to the blade passing frequency (BPF). During this process, the high-speed airflow induces unsteady flow separation in the narrow channel formed by the impeller blade leading edge and the volute tongue, leading to the generation of periodic pressure pulsations. This aerodynamic excitation source with significant frequency characteristics not only generates fundamental frequency noise but also excites higher-order harmonic resonances, forming a broadband noise radiation field. Experimental data show that the noise energy in this region is typically concentrated in the mid-to-high frequency band of 500-2000Hz, which highly overlaps with the frequency range sensitive to human hearing.

[0004] Existing noise reduction technologies mainly revolve around passive control strategies: at the aerodynamic design level, flow field uniformity is improved by optimizing impeller blade profiles and modifying the radius of curvature of the volute profile; in terms of structural design, noise absorption is achieved by employing asymmetric volute tongue structures or adding acoustic wrapping materials. While these technical solutions can reduce the overall sound pressure level to some extent, their effectiveness in suppressing characteristic frequency noise in the volute outlet area is limited. Especially under the premise of maintaining high airflow conditions, traditional passive control methods face a trade-off between noise reduction efficiency and flow loss.

[0005] Therefore, wind turbines are urgently needed to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a fan and a tabletop range hood to solve the problem of limited suppression of characteristic frequency noise in the volute air outlet area in related technologies.

[0007] On the one hand, this utility model provides a fan, which includes:

[0008] The volute has an air outlet duct, and one side wall of the air outlet duct is connected to the volute tongue.

[0009] The noise reduction component divides the air outlet duct into at least two sub-ducts, which are arranged sequentially from one side wall of the air outlet duct connected to the volute tongue to the other side wall opposite the volute tongue.

[0010] As a preferred technical solution for the fan, the noise reduction component includes at least one noise reduction plate, which is disposed in the air outlet duct, and the at least one noise reduction plate divides the air outlet duct into at least two sub-ducts.

[0011] As a preferred technical solution for wind turbines, a noise reduction cavity is provided inside the noise reduction plate, and multiple first noise reduction holes are provided on the side wall of the noise reduction plate opposite to the volute tongue, and the multiple first noise reduction holes are connected to the noise reduction cavity.

[0012] As a preferred technical solution for wind turbines, noise reduction sheets include:

[0013] The main body is located inside the air outlet duct. The noise reduction cavity is located in the main body. The first noise reduction hole is located on the side wall of the main body opposite to the volute tongue. The other side wall of the main body opposite to the first noise reduction hole is provided with a second noise reduction hole that connects to the noise reduction cavity.

[0014] A partition is disposed in the noise reduction cavity and divides the noise reduction cavity into a first cavity and a second cavity. A first noise reduction hole is connected to the first cavity, and a second noise reduction hole is connected to the second cavity.

[0015] As a preferred technical solution for wind turbines, the noise reduction cavity is filled with noise reduction filler.

[0016] As the preferred technical solution for the fan, the end of the air outlet duct furthest from the volute tongue is the air outlet;

[0017] There are at least two noise reduction plates, and the plane on the side of the noise reduction plate closest to the air outlet is parallel to the plane on which the air outlet is located.

[0018] As a preferred technical solution for the fan, the lengths of at least two noise reduction plates increase sequentially from the side wall of the air outlet duct connected to the volute tongue to the opposite side wall.

[0019] As the preferred technical solution for the fan, the end of the air outlet duct furthest from the volute tongue is the air outlet;

[0020] The noise reduction plate is tilted away from the volute tongue, and the noise reduction plate and the plane where the air outlet is located form a preset angle α, 93°≤a≤105°.

[0021] As a preferred technical solution for wind turbines, the volute includes two cover plates and a peripheral wall, with the peripheral wall disposed between the two cover plates;

[0022] A cover plate is provided with at least one first limiting protrusion, and at least one first limiting protrusion corresponds one-to-one with at least one noise reduction sheet. The noise reduction sheet is provided with a first limiting groove. The two cover plates abut against the noise reduction sheet respectively, and the first limiting protrusion is inserted into the first limiting groove of the corresponding noise reduction sheet.

[0023] Alternatively, the two cover plates are respectively provided with at least one first limiting protrusion and at least one second limiting protrusion, and the at least one first limiting protrusion, the at least one second limiting protrusion and the at least one noise reduction sheet are corresponding one-to-one. The noise reduction sheet is provided with a first limiting groove and a second limiting groove. The two cover plates abut against the noise reduction sheet respectively, and the first limiting protrusion is inserted into the first limiting groove of the corresponding noise reduction sheet, and the second limiting protrusion is inserted into the second limiting groove of the corresponding noise reduction sheet.

[0024] On the other hand, this utility model provides a tabletop range hood, including the fan in any of the above-mentioned solutions.

[0025] The beneficial effects of this utility model are as follows:

[0026] This utility model provides a fan and a tabletop range hood. The fan includes a volute and a noise reduction component. The volute has an air outlet duct, one sidewall of which is connected to the volute tongue. The noise reduction component divides the air outlet duct into at least two sub-ducts, arranged sequentially from the sidewall of the air outlet duct connected to the volute tongue to the opposite sidewall. When the fan is working, a high-speed airflow with strong periodic pulsations flows from the impeller area to the air outlet duct of the volute. Because the noise reduction component divides the air outlet duct into at least two sub-ducts, the originally concentrated, large-scale airflow is divided into multiple smaller, independent airflows, resulting in turbulence suppression and pulsation attenuation, effectively reducing the local velocity and turbulence intensity in each duct. This disrupts the original large-scale concentrated vortex structure and pressure pulsations generated by the periodic sweeping of the impeller blades against the volute tongue. Through the constraint of the sub-duct walls, the airflow becomes more laminar and uniform, thus effectively reducing the noise at the fan outlet. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the fan structure in an embodiment of the present utility model. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of the explosion of the fan in an embodiment of the present invention. Figure 1 ;

[0029] Figure 3 This is a schematic diagram of the explosion of the fan in an embodiment of the present invention. Figure 2 ;

[0030] Figure 4 This is a schematic diagram of the explosion of the fan in an embodiment of the present invention. Figure 3;

[0031] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;

[0032] Figure 6 This is a schematic diagram of the fan structure in an embodiment of the present utility model. Figure 2 .

[0033] In the picture:

[0034] 11. Cover plate; 111. First limiting protrusion; 12. Peripheral wall; 13. Volute cavity; 141. Sub-air duct; 142. Air outlet; 15. Volute tongue;

[0035] 21. Noise reduction sheet; 211. Body; 2111. First noise reduction hole; 2112. Second noise reduction hole; 2113. Noise reduction cavity; 2114. First cavity; 2115. Second cavity; 2116. First limiting groove; 212. Partition plate; 22. Noise reduction filler;

[0036] 3. Impeller. Detailed Implementation

[0037] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0041] Example 1

[0042] like Figures 1-6 As shown, this embodiment provides a fan, which includes a volute and a noise reduction assembly. The volute has an air outlet duct, and one side wall of the air outlet duct is connected to the volute tongue 15. The noise reduction assembly divides the air outlet duct into at least two sub-ducts 141, arranged sequentially from the side wall of the air outlet duct connected to the volute tongue 15 to the opposite side wall. When the fan is working, a high-speed airflow with strong periodic pulsations flows from the volute cavity 13 to the air outlet duct of the volute. Because the noise reduction assembly divides the air outlet duct into at least two sub-ducts 141, the originally concentrated, large-scale airflow is divided into multiple smaller-scale independent airflows, resulting in turbulence suppression and pulsation attenuation, effectively reducing the local flow velocity and turbulence intensity in each duct. This disrupts the original large-scale concentrated vortex structure and pressure pulsations generated by the periodic sweeping of the impeller blades 3 against the volute tongue 15. The constraint effect of the wall of the sub-duct 141 makes the airflow more laminar and uniform, thereby effectively reducing the noise at the air outlet 142 of the fan.

[0043] Optionally, the noise reduction component includes at least one noise reduction sheet 21, which is disposed within the air outlet duct, dividing the air outlet duct into at least two sub-ducts 141. In this embodiment, the air outlet duct is divided into at least two sub-ducts 141 by disposing of the noise reduction sheet 21 within it. Optionally, one, two, three, four, or five noise reduction sheets 21 may be provided. When the number of noise reduction sheets 21 is greater than two, at least two noise reduction sheets 21 are arranged sequentially at intervals and parallel to each other along the direction from one side wall of the air outlet duct connected to the volute tongue 15 to the opposite side wall.

[0044] Optionally, a noise reduction cavity 2113 is provided inside the noise reduction plate 21, and a plurality of first noise reduction holes 2111 are provided on the side wall of the noise reduction plate 21 opposite to the volute tongue 15, and the plurality of first noise reduction holes 2111 are connected to the noise reduction cavity 2113. In this embodiment, the high-intensity aerodynamic noise sound waves generated by the interference of the impeller 3 and the volute tongue 15, especially the mid-to-high frequency discrete noise, directly act on the surface of the noise reduction plate 21 with the first noise reduction holes 2111 when it radiates outward, and the sound waves enter the noise reduction cavity 2113 of the noise reduction plate 21 through the first noise reduction holes 2111. Due to the viscous friction of the air at the first noise reduction hole 2111, the sound waves form a viscous dissipation effect, and the heat exchange loss caused by the compression-expansion of the sound waves near the first noise reduction hole 2111 forms a heat conduction dissipation. At the same time, the physical structure of the noise reduction cavity 2113 manipulates the sound waves entering the noise reduction cavity 2113, and weakens or cancels the noise through mechanisms such as absorption, reflection, interference or resonance.

[0045] Optionally, the noise reduction cavity 2113 is filled with noise reduction filler 22. In this embodiment, the sound waves entering the noise reduction cavity 2113 enter the noise reduction cavity 2113 of the noise reduction sheet 21 through the first noise reduction hole 2111. The sound waves propagate in the complex fiber network of the noise reduction filler 22, and the sound energy is converted into heat energy due to friction and viscosity. Only then can the sound energy be efficiently converted / dissipated. In addition, the noise reduction filler 22 significantly broadens the effective sound absorption frequency band and improves the low-frequency sound absorption performance.

[0046] Optionally, the noise-reducing filling 22 can be one of polyester fiber cotton and melamine foam.

[0047] Optionally, the end of the air outlet duct away from the volute tongue 15 is the air outlet 142; at least two noise reduction plates 21 are provided, and the plane of the side of the at least two noise reduction plates 21 near the air outlet 142 is parallel to the plane of the air outlet 142. In this embodiment, the plane of the side of the at least two noise reduction plates 21 near the air outlet 142 is parallel to the plane of the air outlet 142. This arrangement can make the airflow more evenly dispersed and avoid uneven airflow dispersion.

[0048] Optionally, from the side wall of the air outlet duct connected to the volute tongue 15 to the opposite side wall, the lengths of at least two noise-reducing plates 21 increase sequentially. In this embodiment, this arrangement can divert the air blown out by the impeller 3 as early as possible, thereby improving the noise reduction performance of the noise-reducing plates 21 and enhancing the overall noise reduction effect of the fan.

[0049] Optionally, the end of the air outlet duct away from the volute tongue 15 is the air outlet 142; the noise reduction plate 21 is deflected away from the volute tongue 15, and the plane containing the noise reduction plate 21 and the air outlet 142 forms a preset angle α, 93°≤α≤105°. In this embodiment, this arrangement has the effect of balancing airflow guidance, minimizing flow loss, and suppressing noise.

[0050] Optionally, the value of a can be one of 93°, 96°, 99°, 102° and 105°.

[0051] Optionally, the volute includes two cover plates 11 and a peripheral wall 12, with the peripheral wall 12 disposed between the two cover plates 11. Each cover plate 11 has at least one first limiting protrusion 111, which corresponds one-to-one with at least one noise-reducing plate 21. The noise-reducing plate 21 has a first limiting groove 2116. The two cover plates 11 abut against the noise-reducing plate 21, and the first limiting protrusion 111 is inserted into the first limiting groove 2116 of the corresponding noise-reducing plate 21. In this embodiment, the two cover plates 11 and the peripheral wall 12 of the volute surround a volute cavity 13 and an air outlet duct communicating with the volute cavity 13. The impeller 3 is disposed in the volute cavity 13, and the noise-reducing plate 21 is disposed in the air outlet duct and located between the two cover plates 11. The two cover plates 11 clamp the noise-reducing plate 21, thereby preventing the first limiting protrusion 111 from coming out of the first limiting groove 2116, thus achieving the fixation of the noise-reducing plate 21 by the volute.

[0052] In other embodiments, the two cover plates 11 are respectively provided with at least one first limiting protrusion 111 and at least one second limiting protrusion. The at least one first limiting protrusion 111 and the at least one second limiting protrusion correspond one-to-one with at least one noise reduction sheet 21. The noise reduction sheet 21 is provided with a first limiting groove 2116 and a second limiting groove. The two cover plates 11 respectively abut against the noise reduction sheet 21, and the first limiting protrusion 111 is inserted into the first limiting groove 2116 of the corresponding noise reduction sheet 21, and the second limiting protrusion is inserted into the second limiting groove of the corresponding noise reduction sheet 21. In this embodiment, the first limiting protrusion 111 is inserted into the first limiting groove 2116 of the corresponding noise reduction sheet 21 to achieve relative fixation between the noise reduction sheet 21 and the cover plate 11 with the first limiting protrusion 111. The second limiting protrusion is inserted into the second limiting groove of the corresponding noise reduction sheet 21 to achieve relative fixation between the noise reduction sheet 21 and the cover plate 11 with the second limiting protrusion, thereby achieving relative fixation between the noise reduction sheet 21 and the volute.

[0053] This embodiment also provides a tabletop range hood, including the fan described in the above solution.

[0054] Example 2

[0055] This embodiment is basically the same as Embodiment 1, except that the noise reduction plate 21 has a specific structure. Optionally, the noise reduction plate 21 includes a body 211 and a partition 212. The body 211 is disposed in the air outlet duct, and the noise reduction cavity 2113 is located in the body 211. The first noise reduction hole 2111 is located on the side wall of the body 211 opposite to the volute tongue 15. The other side wall of the body 211 opposite to the first noise reduction hole 2111 is provided with a second noise reduction hole 2112 that communicates with the noise reduction cavity 2113. The partition 212 is disposed in the noise reduction cavity 2113 and divides the noise reduction cavity 2113 into a first cavity 2114 and a second cavity 2115. The first noise reduction hole 2111 communicates with the first cavity 2114, and the second noise reduction hole 2112 communicates with the second cavity 2115. In this embodiment, since the noise reduction plate 21 is provided with a first noise reduction hole 2111 and a second noise reduction hole 2112 on the sidewalls opposite to the two adjacent sub-air ducts 141, one noise reduction plate 21 can reduce the noise of the airflow in the two adjacent sub-air ducts 141, further improving the noise reduction efficiency of the noise reduction plate 21. In order to prevent sound waves from entering the noise reduction cavity 2113 from the first noise reduction hole 2111 or the second noise reduction hole 2112 and then exiting from the other of the first noise reduction hole 2111 or the second noise reduction hole 2112, a partition 212 is provided in the noise reduction cavity 2113 to divide the noise reduction cavity 2113 into two independent first cavities 2114 and second cavities 2115, and the first noise reduction hole 2111 or the second noise reduction hole 2112 is connected to the corresponding first cavity 2114 and second cavity 2115 respectively.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A fan, characterized in that, include: The volute is provided with an air outlet, and one side wall of the air outlet is connected to the volute tongue (15). The noise reduction component divides the air outlet into at least two sub-air outlets (141) in a direction from one side wall of the air outlet connected to the volute tongue (15) to the other side wall opposite to the volute tongue (15), and at least two sub-air outlets (141) are arranged sequentially.

2. The fan according to claim 1, characterized in that, The noise reduction component includes at least one noise reduction sheet (21) disposed in the air outlet duct, and at least one of the noise reduction sheets (21) divides the air outlet duct into at least two sub-ducts (141).

3. The fan according to claim 2, characterized in that, The noise reduction plate (21) is provided with a noise reduction cavity (2113). The side wall of the noise reduction plate (21) opposite to the volute tongue (15) is provided with a plurality of first noise reduction holes (2111). The plurality of first noise reduction holes (2111) are connected to the noise reduction cavity (2113).

4. The fan according to claim 3, characterized in that, The noise reduction sheet (21) includes: The body (211) is disposed in the air outlet duct, the noise reduction cavity (2113) is located in the body (211), the first noise reduction hole (2111) is located on the side wall of the body (211) opposite to the volute tongue (15), and the other side wall of the body (211) opposite to the first noise reduction hole (2111) is provided with a second noise reduction hole (2112) communicating with the noise reduction cavity (2113). A partition (212) is disposed in the noise reduction cavity (2113) and divides the noise reduction cavity (2113) into a first cavity (2114) and a second cavity (2115). The first noise reduction hole (2111) is connected to the first cavity (2114), and the second noise reduction hole (2112) is connected to the second cavity (2115).

5. The fan according to claim 3 or 4, characterized in that, The noise reduction cavity (2113) is filled with noise reduction filler (22).

6. The fan according to claim 2, characterized in that, The end of the air outlet duct away from the volute tongue (15) is the air outlet (142); At least two noise reduction plates (21) are provided, and the planes on the side of the noise reduction plates (21) closest to the air outlet (142) are parallel to the plane of the air outlet (142).

7. The fan according to claim 6, characterized in that, From the side wall of the air outlet connected to the volute tongue (15) to the other side wall opposite to the volute tongue (15), the lengths of at least two noise reduction plates (21) increase sequentially.

8. The fan according to claim 2, characterized in that, The end of the air outlet duct away from the volute tongue (15) is the air outlet (142); The noise reduction plate (21) is tilted away from the volute tongue (15), and the noise reduction plate (21) and the plane where the air outlet (142) is located form a preset angle a, 93°≤a≤105°.

9. The fan according to claim 2, characterized in that, The volute includes two cover plates (11) and a peripheral wall (12), the peripheral wall (12) being disposed between the two cover plates (11); One of the cover plates (11) is provided with at least one first limiting protrusion (111), and at least one first limiting protrusion (111) corresponds one-to-one with at least one noise reduction sheet (21). The noise reduction sheet (21) is provided with a first limiting groove (2116). The two cover plates (11) respectively abut against the noise reduction sheet (21), and the first limiting protrusion (111) is inserted into the first limiting groove (2116) of the corresponding noise reduction sheet (21). Alternatively, the two cover plates (11) are respectively provided with at least one first limiting protrusion (111) and at least one second limiting protrusion. At least one first limiting protrusion (111), at least one second limiting protrusion and at least one noise reduction sheet (21) correspond one-to-one. The noise reduction sheet (21) is provided with a first limiting groove (2116) and a second limiting groove. The two cover plates (11) respectively abut against the noise reduction sheet (21), and the first limiting protrusion (111) is inserted into the first limiting groove (2116) of the corresponding noise reduction sheet (21), and the second limiting protrusion is inserted into the second limiting groove of the corresponding noise reduction sheet (21).

10. A tabletop range hood, characterized in that, Includes the wind turbine as described in any one of claims 1-9.

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