A flow guide noise reduction structure and a range hood

Abstract

The present application relates to the technical field of household appliances, and discloses a flow guide and noise reduction structure and a range hood. The flow guide and noise reduction structure comprises a sound absorption and noise reduction plate and a flow guide plate. The sound absorption and noise reduction plate is provided with an avoidance gap and a plurality of sound absorption holes. The avoidance gap is used for avoiding the air inlet of the air duct of the volute of the range hood. The flow guide plate is connected with the sound absorption and noise reduction plate. The flow guide plate is arranged on the oil guide structure of the range hood. The flow guide plate is used for guiding the airflow of the air inlet of the fan case to the air inlet of the air duct. The present application does not affect the normal air inlet of the air inlet of the air duct. In terms of structural design, no interference is generated. The airflow on both sides of the volute is consumed in the form of heat generated by friction through the sound absorption holes, the aerodynamic noise is reduced, the space utilization rate inside the fan case is improved, the airflow velocity from the air inlet of the case to the air inlet of the air duct is reduced, the impact force of the airflow is slowed down, the airflow uniformity of the air inlet of the air duct is improved, and the airflow turbulence degree of the air inlet of the air duct is reduced.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a flow-guiding and noise-reducing structure and a range hood. Background Technology

[0002] Currently, most range hoods using baffles are concentrated in dual-chamber and side-suction types. Existing patent CN202122703503.3 designs a baffle inside the air outlet of a dual-chamber range hood. This baffle, close to the volute, divides the internal air duct into two parts, reducing the impact of airflow on the volute. However, this solution does not consider practical installation issues; adding a baffle inside the air duct can easily cause interference with the duct structure itself. Existing patent CN202122327678.9 adds an automatically adjusting baffle below the smoke inlet of a side-suction range hood to improve smoke extraction, but this affects the overall aerodynamic noise of the machine.

[0003] With the continuous innovation of range hood models, the duct structure of large-space models is constantly being upgraded. Due to the ample duct space in large-space models, the existing guide vane design cannot meet the structural requirements. At the same time, considering the wind noise characteristics generated by the internal flow field, there is an urgent need for a new type of guide structure and noise reduction measures to fill this gap. Summary of the Invention

[0004] Based on the above problems, the purpose of this invention is to provide a flow-guiding and noise-reducing structure and a range hood that can reduce aerodynamic noise without interference in structural design.

[0005] To achieve the above objectives, the following technical solution is provided:

[0006] In a first aspect, the present invention provides a flow-guiding and noise-reducing structure disposed within the fan housing of a range hood, the flow-guiding and noise-reducing structure comprising:

[0007] The sound-absorbing and noise-reducing board is provided with an avoidance notch and a number of sound-absorbing holes. The avoidance notch is used to avoid the air inlet of the duct of the range hood.

[0008] A baffle plate is connected to the sound-absorbing and noise-reducing plate. The baffle plate is disposed on the oil guiding structure of the range hood. The baffle plate is used to guide the airflow from the air inlet of the fan housing to the air inlet of the duct.

[0009] As an optional solution to the airflow guiding and noise reduction structure provided by the present invention, a plurality of airflow guiding blocks are spaced apart on the airflow guiding plate, and an airflow temporary storage groove is formed between two adjacent airflow guiding blocks.

[0010] As an optional solution to the flow-guiding and noise-reducing structure provided by the present invention, the flow-guiding block is arc-shaped.

[0011] As an optional solution to the flow-guiding and noise-reducing structure provided by the present invention, the flow-guiding plate is provided with a first flow-guiding protrusion and a second flow-guiding protrusion, the first flow-guiding protrusion and the second flow-guiding protrusion being located on both sides of the avoidance gap, respectively.

[0012] As an optional solution to the airflow guiding and noise reduction structure provided by the present invention, both the first airflow guiding protrusion and the second airflow guiding protrusion are curved towards the air inlet of the chassis.

[0013] As an optional solution to the airflow guiding and noise reduction structure provided by the present invention, baffles are respectively provided at both ends of the airflow guide plate, and the baffles are in contact with the inner wall of the fan casing.

[0014] As an optional solution to the flow guiding and noise reduction structure provided by the present invention, the baffle is provided with an extension plate, and the extension plate is connected to the oil guiding structure.

[0015] As an optional solution to the airflow-guiding and noise-reducing structure provided by the present invention, a noise-reducing layer is provided on the side of the sound-absorbing and noise-reducing plate facing away from the air inlet of the chassis.

[0016] As an optional solution to the flow-guiding and noise-reducing structure provided by the present invention, the noise-reducing layer is noise-reducing cotton.

[0017] As an optional solution to the flow-guiding and noise-reducing structure provided by the present invention, the sound-absorbing and noise-reducing plate is provided with a plurality of flanged protrusions, the flanged protrusions and the sound-absorbing and noise-reducing plate surround to form a limiting groove, and the noise-reducing layer is disposed in the limiting groove.

[0018] As an optional solution to the airflow-guiding and noise reduction structure provided by the present invention, a porous noise reduction plate is provided on the inner wall of the fan casing facing the air inlet of the air duct, and a resonant sound-absorbing cavity is formed between the sound-absorbing noise reduction plate and the porous noise reduction plate.

[0019] As an optional solution to the flow-guiding and noise-reducing structure provided by the present invention, the porosity of the sound-absorbing noise-reducing plate is less than that of the porous noise-reducing plate.

[0020] As an optional solution to the airflow guiding and noise reduction structure provided by the present invention, the avoidance notch is fitted to the air duct enclosure of the volute.

[0021] Secondly, the present invention also provides a range hood, including the above-mentioned airflow guiding and noise reduction structure.

[0022] The beneficial effects of this invention are as follows:

[0023] The airflow guiding and noise reduction structure and range hood provided by this invention, since the airflow guiding and noise reduction structure is set inside the fan housing of the range hood, avoids the air inlet of the duct through the avoidance notch of the sound-absorbing and noise-reducing plate. The sound-absorbing and noise-reducing plate will not affect the normal air intake of the air inlet of the duct, and there will be no interference in terms of structural design. The sound-absorbing and noise-reducing plate can also block the airflow from escaping to both sides of the air inlet of the duct, so that the airflow is concentrated at the air inlet of the duct. The sound-absorbing holes of the sound-absorbing and noise-reducing plate consume the sound energy of the airflow on both sides of the duct through frictional heat generation, thereby reducing aerodynamic noise. Since the guide plate is set on the oil guiding structure of the range hood, the space utilization rate inside the fan housing is improved. The guide plate guides the airflow from the fan housing air inlet to the air inlet of the duct, reduces the airflow velocity from the fan housing air inlet to the air inlet of the duct, reduces the impact force of the airflow, improves the airflow uniformity of the air inlet of the duct, and reduces the degree of airflow turbulence at the air inlet of the duct. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0025] Figure 1 This is a front view schematic diagram of the airflow guiding and noise reduction structure provided in a specific embodiment of the present invention being installed inside the fan casing of a range hood;

[0026] Figure 2 This is an isometric view of the airflow guiding and noise reduction structure provided in a specific embodiment of the present invention, which is installed inside the fan housing of a range hood.

[0027] Figure 3 This is a front view schematic diagram of the flow-guiding and noise-reducing structure provided in a specific embodiment of the present invention;

[0028] Figure 4 This is a first isometric schematic diagram of the flow-guiding and noise-reducing structure provided in a specific embodiment of the present invention;

[0029] Figure 5 This is a second isometric schematic diagram of the flow-guiding and noise-reducing structure provided in a specific embodiment of the present invention;

[0030] Figure 6 This is a front view schematic diagram of the flow-guiding and noise-reducing structure (with a first flow-guiding protrusion and a second flow-guiding protrusion provided on the flow-guiding plate) provided in a specific embodiment of the present invention.

[0031] Figure 7 This is a cross-sectional schematic diagram of the airflow guiding and noise reduction structure provided in a specific embodiment of the present invention, which is installed inside the fan casing of a range hood.

[0032] Figure 8 This is an exploded view of the range hood provided in a specific embodiment of the present invention.

[0033] In the picture:

[0034] 100. Airflow guiding and noise reduction structure; 110. Sound-absorbing and noise-reducing board; 111. Clearance notch; 112. Sound-absorbing hole; 113. Flanged protrusion; 120. Airflow guide plate; 121. Airflow guide block; 122. Airflow storage groove; 123. First airflow guide protrusion; 124. Second airflow guide protrusion; 130. Baffle; 140. Extension plate; 141. Screw hole;

[0035] 150. Resonant sound-absorbing cavity;

[0036] 200. Fan casing; 201. Perforated noise reduction plate; 300. Volute; 301. Air inlet of air duct; 302. Air duct enclosure; 400. Oil guiding structure; 500. Smoke collection chamber. Detailed Implementation

[0037] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, 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 the invention 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 the invention. 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.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0040] like Figures 1 to 8 As shown, this embodiment provides a flow-guiding and noise-reducing structure 100, which is disposed within the fan housing 200 of a range hood. The flow-guiding and noise-reducing structure 100 includes a sound-absorbing and noise-reducing plate 110 and a flow-guiding plate 120. The sound-absorbing and noise-reducing plate 110 is provided with an avoidance notch 111 and several sound-absorbing holes 112. The avoidance notch 111 is used to avoid the air inlet 301 of the duct of the range hood's volute 300. The flow-guiding plate 120 is connected to the sound-absorbing and noise-reducing plate 110 and is disposed on the oil-guiding structure 400 of the range hood. The flow-guiding plate 120 is used to guide the airflow from the fan housing 200's housing air inlet to the air inlet 301. The sound-absorbing holes 112 can be circular holes with a diameter of 2mm, and the spacing between two adjacent sound-absorbing holes 112 can be 8mm.

[0041] Since the airflow guiding and noise reduction structure 100 is located inside the fan housing 200 of the range hood, it avoids the air inlet 301 of the volute 300 through the avoidance notch 111 of the sound-absorbing and noise reduction plate 110. Therefore, the sound-absorbing and noise reduction plate 110 will not affect the normal air intake of the air inlet 301, and there will be no interference in the structural design. The sound-absorbing and noise reduction plate 110 can also prevent airflow from escaping to both sides of the air inlet 301, causing the airflow to concentrate at the air inlet 301. The sound-absorbing holes 112 of the sound-absorbing and noise reduction plate 110 further reduce the airflow to the sides of the volute 300. The airflow consumes sound energy through frictional heat generation, reducing aerodynamic noise. Since the guide plate 120 is set on the oil guiding structure 400 of the range hood, it improves the space utilization rate inside the fan housing 200. The guide plate 120 guides the airflow from the air inlet of the fan housing 200 to the air inlet 301 of the duct, reducing the airflow velocity from the air inlet of the housing to the air inlet 301, reducing the impact force of the airflow, improving the airflow uniformity of the air inlet 301, and reducing the degree of airflow turbulence in the air inlet 301.

[0042] To avoid affecting the airflow at the air inlet 301 of the duct, the guide vane 120 can be located below the sound-absorbing and noise-reducing plate 110. The guide vane 120 and the sound-absorbing and noise-reducing plate 110 can be integrally molded for easy installation. The overall outer contour of the guide vane 120 matches the oil guiding structure 400 and can be set on top of the oil guiding structure 400, making full use of the space above the oil guiding structure 400 inside the fan housing 200. The length of the outer contour of the guide vane 120 can be 858mm, and the height can be 90mm. The thickness of the sound-absorbing and noise-reducing plate 110 is determined according to actual needs, generally 0.8mm-5mm. The material of the sound-absorbing and noise-reducing plate 110 can be resin material or cut metal sheet.

[0043] Optionally, the baffle plate 120 is provided with multiple baffle blocks 121 at intervals, and an airflow storage groove 122 is formed between two adjacent baffle blocks 121. The multiple baffle blocks 121 can be arranged at equal intervals in the horizontal direction to avoid affecting the airflow from the chassis air inlet to the air duct air inlet 301. The airflow can be temporarily confined in the airflow storage groove 122, and the baffle blocks 121 can block part of the airflow from diffusing to both sides of the volute 300, so that more airflow enters the air duct air inlet 301 under the negative pressure, increasing the airflow rate of the air duct air inlet 301. The height of the baffle block 121 can be 90mm, the thickness can be 10mm, and the interval between two adjacent baffle blocks 121 can be 20mm.

[0044] Optionally, the guide block 121 is arc-shaped. The arc design reduces airflow resistance, facilitates a better transition to the air inlet 301, improves the uniformity of the flow field at the air inlet 301, reduces airflow turbulence, and lowers aerodynamic noise. The guide block 121 can be vertically positioned, with the height of its upper and lower sides being less than its central height. In some embodiments, the guide block 121 can also be a sloping wedge-shaped block.

[0045] Optionally, the air deflector 120 is provided with a first air deflector protrusion 123 and a second air deflector protrusion 124, which are located on both sides of the clearance notch 111. The first air deflector protrusion 123 and the second air deflector protrusion 124 concentrate the airflow from both sides of the chassis air inlet towards the center of the air duct. To improve the air deflection effect, the first air deflector protrusion 123 and the second air deflector protrusion 124 are optionally both curved towards the chassis air inlet.

[0046] To minimize airflow escape from the air inlet of the chassis to the sides of the volute 300, optionally, baffles 130 are provided at both ends of the guide plate 120, with the baffles 130 abutting against the inner wall of the fan casing 200. The baffles 130 can be rectangular, with a length of 140mm, a height of 90mm, and a width of 5mm. The baffles 130 and the sound-absorbing and noise-reducing plate 110 can be integrally formed, facilitating the installation and fixation of the entire airflow guiding and noise-reducing structure 100.

[0047] To facilitate fixing the baffle 130, optionally, an extension plate 140 is provided on the baffle 130, and the extension plate 140 is connected to the oil guiding structure 400. The extension plate 140 may be provided with multiple screw holes 141, through which screws are inserted to fix the extension plate 140 to the oil guiding structure 400. The multiple screw holes 141 can be equally spaced to ensure uniform force distribution on the extension plate 140. The multiple screw holes 141 can be of the same size to facilitate the use of screws of the same specification; the diameter of the screw holes 141 can be 3.2 mm.

[0048] To improve the noise reduction effect of the sound-absorbing and noise-reducing panel 110, optionally, a noise-reducing layer is provided on the side of the sound-absorbing and noise-reducing panel 110 facing away from the air inlet of the chassis. Optionally, the noise-reducing layer is noise-reducing cotton. Noise-reducing cotton, also known as sound insulation cotton, is mainly composed of porous fibers. The noise reduction principle of noise-reducing cotton is as follows: sound waves travel through the air. Because noise-reducing cotton has a multi-fiber structure, when sound waves pass through it, they are reflected, superimposed, and collide with countless fibers, converting sound wave energy into heat energy, weakening the sound wave intensity, and causing the sound to disappear.

[0049] Optionally, the sound-absorbing and noise-reducing panel 110 is provided with multiple flanged protrusions 113, which together with the sound-absorbing and noise-reducing panel 110 form a limiting groove, and the noise-reducing layer is disposed within the limiting groove. The noise-reducing cotton is precisely positioned within the limiting groove, eliminating the need for additional installation methods to fix the noise-reducing cotton.

[0050] Optionally, a porous noise reduction plate 201 is provided on the inner wall of the fan casing 200 facing the air inlet 301 of the air duct, and a resonant sound-absorbing cavity 150 is formed between the sound-absorbing noise reduction plate 110 and the porous noise reduction plate 201. The airflow noise is weakened after passing through the porous noise reduction plate 201, and then further absorbed after reaching the sound-absorbing noise reduction plate 110. The perforation diameter of the porous noise reduction plate 201 is 2.2 mm, and the perforation spacing is 10 mm.

[0051] Optionally, the porosity of the sound-absorbing and noise-reducing panel 110 is less than that of the porous noise-reducing panel 201. The sound-absorbing and noise-reducing panel 110 has a smaller porosity and is more effective at absorbing low-frequency noise, while the porous noise-reducing panel 201 has a larger porosity and is more effective at absorbing mid- and high-frequency noise. Both methods can effectively absorb noise peaks and avoid the operating risk frequencies of the range hood.

[0052] Optionally, the clearance notch 111 is fitted to the air duct enclosure 302 of the volute 300. That is, the clearance notch 111 is created by hollowing out the outer contour of the air duct of the volute 300 on the sound-absorbing and noise-reducing plate 110. The sound-absorbing and noise-reducing plate 110 will not affect the normal air intake of the air duct inlet 301, nor will it cause interference in the structural design. The sound-absorbing and noise-reducing plate 110 can also prevent airflow from escaping to both sides of the air duct inlet 301, causing the airflow to concentrate at the air duct inlet 301. The clearance notch 111 only needs to be abutted against the air duct enclosure 302; no fixed connection between the two is required.

[0053] This embodiment also provides a range hood, including the aforementioned airflow guiding and noise reduction structure 100. Airflow from the smoke collection chamber 500 enters the fan housing 200 through the housing inlet. Under negative pressure, the airflow enters the duct inlet 301. Since the airflow guiding and noise reduction structure 100 is located inside the fan housing 200 of the range hood, it avoids the duct inlet 301 of the volute 300 through the clearance notch 111 of the sound-absorbing and noise-reducing plate 110. Therefore, the sound-absorbing and noise-reducing plate 110 will not affect the normal airflow into the duct inlet 301, and there will be no interference in the structural design. Furthermore, the sound-absorbing and noise-reducing plate 110 can also prevent airflow from escaping to the sides of the duct inlet 301, thus ensuring airflow... The airflow is concentrated at the air inlet 301 of the duct. The sound energy of the airflow on both sides of the volute 300 is consumed by frictional heat generation through the sound absorption holes 112 of the sound-absorbing and noise-reducing plate 110, thereby reducing aerodynamic noise. Since the guide plate 120 is set on the oil guiding structure 400 of the range hood, the space utilization rate inside the fan housing 200 is improved. The airflow of the fan housing 200 is guided to the air inlet 301 of the duct through the guide plate 120, which reduces the airflow velocity from the fan housing to the air inlet 301, reduces the impact force of the airflow, improves the airflow uniformity of the air inlet 301, and reduces the degree of airflow turbulence in the air inlet 301.

[0054] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A flow-guiding and noise-reducing structure, characterized in that, The airflow guiding and noise reduction structure, located inside the fan housing (200) of the range hood, includes: The sound-absorbing and noise-reducing plate (110) is provided with an avoidance notch (111) and a number of sound-absorbing holes (112). The avoidance notch (111) is used to avoid the air inlet (301) of the volute (300) of the range hood. The sound-absorbing and noise-reducing plate (110) can also block the airflow from escaping to both sides of the air inlet (301), so that the airflow is concentrated in the air inlet (301). The guide plate (120) is integrally formed with the sound absorption and noise reduction plate (110). The guide plate (120) is disposed on the oil guiding structure (400) of the range hood. The guide plate (120) is used to guide the airflow of the air inlet of the fan box (200) to the air inlet (301) of the air duct. The guide plate (120) is provided with a first guide protrusion (123) and a second guide protrusion (124), the first guide protrusion (123) and the second guide protrusion (124) are respectively located on both sides of the clearance notch (111); the first guide protrusion (123) and the second guide protrusion (124) are both curved towards the air inlet of the chassis.

2. The flow-guiding and noise-reducing structure according to claim 1, characterized in that, The guide plate (120) is provided with baffles (130) at both ends, and the baffles (130) are in contact with the inner wall of the fan casing (200).

3. The flow-guiding and noise-reducing structure according to claim 2, characterized in that, An extension plate (140) is provided on the baffle (130), and the extension plate (140) is connected to the oil guiding structure (400).

4. The flow-guiding and noise-reducing structure according to claim 1, characterized in that, The sound-absorbing and noise-reducing panel (110) has a noise-reducing layer on the side facing away from the air inlet of the chassis.

5. The flow-guiding and noise-reducing structure according to claim 4, characterized in that, The noise-reducing layer is noise-reducing cotton.

6. The flow-guiding and noise-reducing structure according to claim 4, characterized in that, The sound-absorbing and noise-reducing plate (110) is provided with a plurality of flange protrusions (113), the flange protrusions (113) and the sound-absorbing and noise-reducing plate (110) are arranged to form a limiting groove, and the noise-reducing layer is disposed in the limiting groove.

7. The flow-guiding and noise-reducing structure according to claim 1, characterized in that, The fan casing (200) has a porous noise reduction plate (201) on its inner wall facing the air inlet (301) of the air duct, and a resonant sound absorption cavity (150) is formed between the sound-absorbing noise reduction plate (110) and the porous noise reduction plate (201).

8. The flow-guiding and noise-reducing structure according to claim 7, characterized in that, The porosity of the sound-absorbing noise reduction plate (110) is less than that of the porous noise reduction plate (201).

9. The flow-guiding and noise-reducing structure according to any one of claims 1-8, characterized in that, The clearance notch (111) is fitted to the air duct enclosure (302) of the volute (300).

10. A range hood, characterized in that, Includes the flow-guiding and noise-reducing structure as described in any one of claims 1-9.

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