A noise-reducible range hood air outlet

Abstract

The utility model discloses a kind of noise reduction range hood air outlet, including air outlet seat and sound absorption component, the air outlet seat is hollow structure and forms air guide cavity, including upper frame, lower frame, and the connecting side wall of connecting the upper frame and lower frame, the sound absorption component is covered in air outlet seat outside, the connecting side wall is uniformly provided with noise reduction hole.Compared with prior art, the utility model focuses on the main noise source of air outlet seat, by setting multiple noise reduction holes on its wall surface, the airflow noise generated by internal variable diameter structure is effectively guided to the sound absorption component outside for absorption and dissipation, targeted reduction is realized on noise propagation path, the middle-high frequency noise generated by air outlet seat structure change and aerodynamic disturbance is significantly reduced, so as to improve the mute performance of range hood as a whole, improve user's use experience.

Description

Technical Field

[0001] This utility model relates to the field of range hoods, and in particular to a noise-reducing range hood air outlet. Background Technology

[0002] Noise control remains a key challenge in the current technological development of household range hoods. Existing noise reduction methods mostly focus on components such as the blower, air box, air inlet grille, and internal air duct. While noise from these structures is suppressed to some extent, the air outlet, as an exposed structure, also constitutes a significant noise source. Because the air outlet needs to connect to both the ventilation duct and the main body of the range hood, its structure is often designed with a transitional shape from square to round. This change in diameter significantly increases airflow resistance, leading to higher noise levels when smoke passes through, thus negatively impacting the user's experience.

[0003] Based on the above, the existing range hood exhaust vents need further improvement. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a noise-reducing range hood air outlet. The outlet is connected to the sound-absorbing component and the air guide cavity through a noise-reducing hole, so that the noise in the air guide cavity is absorbed by the sound-absorbing component, thereby reducing the noise transmission from the air outlet seat.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a noise-reducing range hood air outlet, including an air outlet seat and a sound-absorbing component, wherein the air outlet seat is designed as a hollow structure and forms an air guide cavity, including an upper frame, a lower frame, and a connecting sidewall connecting the upper frame and the lower frame, the sound-absorbing component covering the outside of the air outlet seat, and noise-reducing holes are evenly distributed on the connecting sidewall.

[0006] Compared with existing technologies, this utility model focuses on the air outlet seat as the main noise source. By setting multiple noise reduction holes on its wall, the airflow noise generated by the internal variable diameter structure is effectively guided to the external sound absorption component for absorption and dissipation. This achieves targeted reduction from the noise propagation path, significantly reducing the mid-to-high frequency noise generated by the structural changes and aerodynamic disturbances of the air outlet seat, thereby improving the overall quietness of the range hood and enhancing the user experience.

[0007] Preferably, the sound-absorbing component includes sound-absorbing cotton covering the outside of the connecting sidewall and a protective sleeve surrounding the outside of the sound-absorbing cotton, wherein the sound-absorbing cotton covers the noise reduction hole; the sound-absorbing cotton surrounds the sidewall of the air outlet seat so that the noise transmitted from the noise reduction hole is directly transmitted to the sound-absorbing cotton for absorption, thereby ensuring the sound absorption effect.

[0008] Preferably, it also includes a flow-diverting structure, which is disposed in the air guide cavity and includes a connecting rod and several flow-diverting plate fins. The flow-diverting plate fins are arranged in a rotating manner around the connecting rod. The flow-diverting plate fins divert the flue gas to avoid excessively large passage area in the air outlet seat, which would cause airflow turbulence and generate greater noise due to impact with the side wall of the air outlet seat.

[0009] Preferably, the flow divider fins are evenly distributed with flow holes; the flow divider fins divide the air guide cavity into several air-catching areas, and the flow holes keep the air pressure in each air-catching area balanced, preventing excessive local air pressure from generating noise and airflow from impacting the flow divider fins from generating noise.

[0010] Preferably, the air guide cavity is provided with a positioning structure, the positioning structure includes positioning blocks, and a positioning groove is formed between adjacent positioning blocks. The diverter fins are engaged in the positioning grooves. The positioning grooves prevent the diverter fins from loosening on the air outlet seat and enable the diverter fins to be detachably connected.

[0011] Preferably, the diverter fin includes an upper edge trajectory line, a side edge trajectory line, and a lower edge trajectory line, the side edge trajectory line connects the upper edge trajectory line and the lower edge trajectory line, and the included angle β of the projection of the upper edge trajectory line and the lower edge trajectory line is 40°-60°.

[0012] Preferably, the β angle is 45°; a vertical path is formed between the upper and lower trajectory lines to guide the flue gas. The flue gas enters from the upper trajectory line, rotates 45°, and flows out from the lower trajectory line, providing a certain horizontal angle guidance for the formation of rotating airflow. If the angle is set too small, the overall rotation speed of the flue gas is insufficient, and the rotating airflow is unstable. If the angle is set too large, the flue gas speed will gradually weaken due to excessive changes in direction and wind resistance, causing oil fumes to accumulate on the diverter fins and affecting the diversion angle of the diverter fins. However, 45° is the preferred angle, and this application does not impose a unique limitation on the β angle.

[0013] Preferably, the upper edge trajectory of the diverter fin includes two guide sections and a connecting section. The connecting section is located between the two guide sections. The radius of curvature R of the connecting section satisfies 15mm≤R≤25mm, and the radius of curvature of the guide section satisfies 995mm≤R≤1005mm. The radius of curvature of the guide section and the connecting section differs significantly. The guide section is relatively gentle, while the connecting section has a larger turning radius. This allows the flue gas to be rapidly turned in the horizontal direction by impacting the connecting section at high speed from the accelerated state of the guide section. This ensures that the flue gas still has a certain initial velocity after turning and enters the second guide section for acceleration, thereby forming a rotating airflow with a certain horizontal velocity.

[0014] Preferably, the side trajectory line includes a first transition section and a second transition section. The upper trajectory line, the first transition section, the second transition section, and the lower trajectory line are connected end to end to form the diverter fin. The included angle between the first transition section and the second transition section is 110-125°, and the length of the first transition section is 2-3 times that of the second transition section. Since the pipe diameter of the air outlet seat changes from square to round, the side trajectory line is set into two segments so that the side trajectory line conforms to the pipe diameter shape of the air outlet seat.

[0015] Preferably, the outer side of the upper frame is provided with an extension portion, which forms a mounting groove with the outer wall of the upper frame, and the mounting groove is used to connect with the ventilation pipe.

[0016] Preferably, the upper frame is circular and the lower frame is rectangular, so that the upper frame is adapted to the ventilation duct and the lower frame is adapted to the range hood. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 .

[0018] Figure 2 This is an exploded view of the structure of this utility model.

[0019] Figure 3 This is a schematic diagram of the structure of this utility model. Figure 2 .

[0020] Figure 4 This is a structural diagram of the air outlet base and positioning structure.

[0021] Figure 5 This is a cross-sectional view of the air vent base.

[0022] Figure 6 This is a top view of the split-flow structure.

[0023] Figure 7 This is a schematic diagram of the structure of the flow divider fins.

[0024] Figure 8 This is a schematic diagram of the diversion structure.

[0025] Label Explanation:

[0026] The range hood with noise reduction features the following components: air outlet 1, air outlet base 2, upper frame 21, lower frame 22, connecting side wall 23, noise reduction hole 231, air guide cavity 24, extension 25, mounting groove 26, mounting hole 27, reinforcing rod 28, sound absorption component 3, sound absorption cotton 31, sheath 32, mounting part 321, through hole 3211, flow diversion structure 4, positioning structure 5, positioning block 51, positioning groove 52, connecting rod 6, flow diversion plate fins 7, upper edge trajectory line 71, flow guide section 711, connecting section 712, side edge trajectory line 72, first transition section 721, second transition section 722, lower edge trajectory line 73, and flow hole 74. Detailed Implementation

[0027] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "horizontal", "inner", and "outer" is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this utility model and simplifying the description, and does 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, it should not be construed as a limitation of this utility model.

[0028] See Figures 1 to 3 This embodiment discloses a noise-reducing range hood air outlet 1, including an air outlet seat 2 and a sound-absorbing component 3. The air outlet seat 2 is designed as a hollow structure and forms an air guide cavity 24, including an upper frame 21, a lower frame 22, and a connecting side wall 23 connecting the upper frame 21 and the lower frame 22. The sound-absorbing component 3 covers the outside of the air outlet seat 2, and noise-reducing holes 231 are evenly distributed on the connecting side wall 23.

[0029] To ensure noise transmission efficiency and structural rigidity of the air outlet seat 2, the diameter of the noise reduction hole 231 is 2mm.

[0030] The sound-absorbing component 3 includes sound-absorbing cotton 31 covering the outside of the connecting sidewall 23 and a protective sleeve 32 surrounding the outside of the sound-absorbing cotton 31. The sound-absorbing cotton 31 covers the noise reduction hole 231. In this solution, the sound-absorbing cotton 31 absorbs noise in the air guide cavity 24 through the noise reduction hole 231, blocking the path of noise propagation outward.

[0031] At least two sheaths 32 are provided. During installation, the sound-absorbing cotton 31 is first installed around the air outlet seat 2, and then the sheaths 32 are placed around the sound-absorbing cotton 31 from the outside and fixed, so as to realize the independent installation of the air outlet seat 2, the sound-absorbing cotton 31, and the sheaths 32, which facilitates disassembly, maintenance and installation in the later stage.

[0032] Specifically, the sound-absorbing cotton 31 is made of rubber-plastic cotton. The rubber-plastic cotton used in the sound-absorbing cotton 31 of this solution is an elastic closed-cell foam material with good elasticity and absorption, and high noise absorption efficiency.

[0033] To ensure a stable connection between the sheaths 32, each sheath 32 has a mounting portion 321 extending outward from its edge at both ends. The mounting portion 321 has a through hole 3211, and the mounting portions 3211 of adjacent sheaths 32 are correspondingly provided and connected by screws.

[0034] See Figures 1 to 3 ,as well as Figures 6 to 8 It also includes a flow-dividing structure 4, which is disposed within the air guide cavity 24 and includes a connecting rod 6 and several flow-dividing plate fins 7. The flow-dividing plate fins 7 are arranged in a rotating manner around the connecting rod 6. In this design, the flow-dividing plate fins 7 divide the large-diameter air guide channel of the air guide cavity 21 into several air-catching areas with smaller passage areas, limiting the formation of turbulent airflow, making the airflow move roughly along the diameter direction of the air outlet seat 2, resulting in a more uniform airflow direction and reducing the noise generated by the airflow impacting the side wall of the air outlet seat 2.

[0035] The flow-through holes 74 are evenly distributed on the flow-through plate fins 7. The flow-through holes 74 in this design keep the air pressure in each wind-catching area balanced, prevent excessive local air pressure from generating noise, and at the same time relieve the noise generated by the airflow hitting the flow-through plate fins 7, so that the flow-through plate fins 7 themselves do not generate additional noise.

[0036] The diameter of the flow passage 74 is 3 mm.

[0037] See Figure 1 and Figure 4 In order to make the diversion structure 4 detachably installed in the air guide cavity 21, the air guide cavity 21 is provided with a positioning structure 5. The positioning structure 5 includes a positioning block 51, and a positioning groove 52 is formed between adjacent positioning blocks 51. The diversion plate fin 7 is engaged in the positioning groove 52.

[0038] See Figures 6 to 8 The flow divider fin 7 includes an upper edge trajectory line 71, a side edge trajectory line 72, and a lower edge trajectory line 73. The side edge trajectory line 72 connects the upper edge trajectory line 71 and the lower edge trajectory line 73. The included angle β between the projections of the upper edge trajectory line 71 and the lower edge trajectory line 73 is 40°-60°.

[0039] The β angle is 45°. The wind-catching area angle range of this scheme is 90°. The β angle formed between the upper trajectory line 71 and the lower trajectory line 73 is used to guide the rotation of flue gas in the vertical direction. Since the flue gas also flows along the direction from the upper trajectory line 71 to the lower trajectory line 73 during the rotation along the β angle, if the angle is set too small, the resulting guiding path will be too gentle, and the airflow rotation direction will be insufficient, making it difficult to form a rotating airflow. If the angle is set too large, the path required for rotation will be too long, and the airflow speed will gradually decrease. In addition, due to wind resistance, the fumes are prone to accumulate on the diverter fins 7, affecting the diverter fins 7's guiding efficiency. At the same time, the airflow speed is too low when it reaches the lower trajectory line 73, resulting in poor stability of the rotating airflow. Therefore, 45° is the optimal angle, and the β angle is not limited to a single angle.

[0040] The upper trajectory line 71 includes two guide sections 711 and a connecting section 712. The connecting section 712 is located between the two guide sections 711. The radius of curvature R of the connecting section 712 satisfies 15mm≤R≤25mm, and the radius of curvature of the guide section 711 satisfies 995mm≤R≤1005mm. In this design, the radius of curvature of the connecting section 712 is set to be much smaller than that of the guide section 711, and the connecting section 712 is located between the guide sections 711. When the flue gas flows through the first guide section 711, due to the large radius of curvature and gentle curvature, the airflow gradually accelerates. When entering the connecting section 712 from the guide section 711, due to the small radius of curvature, it is equivalent to a sharp turn. The airflow impacts the connecting section 712 at high speed, thereby achieving a high-speed turn and slightly reducing the flow velocity. After entering the second guide section 711, the airflow continues to accelerate and rotates and forms a unified, highly rotating airflow outside the lower trajectory line 73 with the airflow in other wind-catching areas, reducing the formation of turbulent airflow.

[0041] The side trajectory line 72 includes a first transition section 721 and a second transition section 722. The upper trajectory line 71, the first transition section 721, the second transition section 722 and the lower trajectory line 73 are connected end to end to form the diverter fin 7. The included angle between the first transition section 721 and the second transition section 722 is 110-125°. The length of the first transition section 721 is 2-3 times that of the second transition section 722.

[0042] See Figures 1 to 5 The upper frame 21 has an extension 25 on its outer side. The extension 25 and the outer wall of the upper frame 21 form an installation groove 26, which is used to connect to the ventilation pipe.

[0043] The upper frame 21 is circular, and the lower frame 22 is rectangular. In this design, the upper frame is connected to the ventilation duct, and the lower frame is connected to the range hood.

[0044] The lower frame 22 is provided with mounting holes 27, which are used for aligning and installing with the range hood.

[0045] The air outlet seat 2 is provided with a reinforcing rod 28, and the two ends of the reinforcing rod 28 are respectively arranged on the inner wall of the air outlet seat 2.

[0046] Compared with the prior art, this utility model focuses on the main noise source, the air outlet seat 2. By setting multiple noise reduction holes 231 on its wall, the airflow noise generated by the internal variable diameter structure is effectively guided to the external sound absorption component 3 for absorption and dissipation. This achieves targeted reduction from the noise propagation path, significantly reducing the mid-to-high frequency noise generated by the structural changes and aerodynamic disturbances of the air outlet seat 2. As a result, the overall quietness performance of the range hood is improved, and the user experience is enhanced.

[0047] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A noise-reducing range hood air outlet, characterized in that, It includes an air outlet seat (2) and a sound-absorbing component (3). The air outlet seat (2) is a hollow structure and forms an air guide cavity (24). It includes an upper frame (21), a lower frame (22), and a connecting sidewall (23) connecting the upper frame (21) and the lower frame (22). The sound-absorbing component (3) covers the outside of the air outlet seat (2). Noise reduction holes (231) are evenly distributed on the connecting sidewall (23).

2. The air outlet according to claim 1, characterized in that, The sound-absorbing component (3) includes sound-absorbing cotton (31) covering the outside of the connecting sidewall (23) and a sheath (32) surrounding the outside of the sound-absorbing cotton (31), wherein the sound-absorbing cotton (31) covers the noise reduction hole (231).

3. The air outlet according to claim 1, characterized in that, It also includes a flow divider structure (4), which is set in the air guide cavity (24) and includes a connecting rod (6) and several flow divider fins (7). The flow divider fins (7) are arranged in a rotating manner around the connecting rod (6).

4. The air outlet according to claim 3, characterized in that, The flow-through holes (74) are evenly distributed on the flow-through plate fins (7).

5. The air outlet according to claim 3, characterized in that, The air guide cavity (24) is provided with a positioning structure (5), the positioning structure (5) includes a positioning block (51), and a positioning groove (52) is formed between adjacent positioning blocks (51). The diverter plate fins (7) are engaged in the positioning groove (52).

6. The air outlet according to claim 3, characterized in that, The flow divider fin (7) includes an upper edge trajectory line (71), a side edge trajectory line (72) and a lower edge trajectory line (73). The side edge trajectory line (72) connects the upper edge trajectory line (71) and the lower edge trajectory line (73). The included angle β of the projection of the upper edge trajectory line (71) and the lower edge trajectory line (73) is 40°-60°.

7. The air outlet according to claim 6, characterized in that, The upper trajectory line (71) includes two guide sections (711) and a connecting section (712). The connecting section (712) is disposed between the two guide sections (711). The radius of curvature R of the connecting section (712) satisfies 15mm≤R≤25mm, and the radius of curvature of the guide section (711) satisfies 995mm≤R≤1005mm.

8. The air outlet according to claim 7, characterized in that, The side trajectory line (72) includes a first transition section (721) and a second transition section (722). The upper trajectory line (71), the first transition section (721), the second transition section (722) and the lower trajectory line (73) are connected end to end to form the diverter fin (7). The included angle between the first transition section (721) and the second transition section (722) is 110-125°. The length of the first transition section (721) is 2-3 times that of the second transition section (722).

9. The air outlet according to claim 1, characterized in that, The upper frame (21) has an extension (25) on its outer side. The extension (25) and the outer wall of the upper frame (21) form an installation groove (26). The installation groove (26) is used to connect to the ventilation pipe.

10. The air outlet according to claim 6, characterized in that, The upper frame (21) is circular, and the lower frame (22) is rectangular.

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