Air bellow flow guide and sound absorption structure of range hood and range hood

Abstract

The utility model provides an extractor hood and an air bellow flow guiding and sound absorbing structure thereof, the air bellow flow guiding and sound absorbing structure comprises an air bellow and a fan arranged in the air bellow, and an air inlet space is formed between the air inlet side of the fan and the air bellow; an air inlet is formed in the bottom of the air bellow and communicates with the air inlet space; a flow guide plate is arranged at the top of the air inlet space, and the air in the air inlet space is guided to the air inlet side of the draught fan. According to the air bellow flow guide and sound absorption structure of the range hood and the range hood provided by the utility model, the vortex rupture noise at the upper part of the air bellow can be reduced, so that the noise generated by a fan system of the range hood is obviously reduced.

Description

Technical Field

[0001] The utility model relates to a range hood, in particular to a bellows flow guiding and sound absorbing structure of the range hood and the range hood. Background Art

[0002] As consumers have higher and higher requirements for the oil fume removal effect of range hoods, various manufacturers have raised the design targets for air volume and static pressure. Using DC motors instead of traditional AC motors has greatly increased the speed of the fan, but the resulting noise problem has become increasingly prominent. Therefore, consumers need products that meet the requirements of large air volume and high static pressure, with lower operating noise and more acceptable sound quality.

[0003] The internal noise of the range hood can be generally divided into two categories: shell structure vibration noise and aerodynamic noise. The noise sources of the range hood are mainly the motor and fan, and the transmission paths are mainly divided into air inlet, air outlet, casing vibration and radiation noise. The fan system is the main sound source of the range hood and is also the focus of noise reduction for many R&D personnel. At present, the most commonly used method is to optimize the impeller and volute profile, but the noise reduction range is limited and cannot meet the low noise requirements of users.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content

[0005] The utility model aims to provide a bellows flow guide and sound absorption structure for a range hood, which can reduce the vortex rupture noise at the upper part of the bellows, thereby significantly reducing the noise generated by the fan system of the range hood.

[0006] Another object of the present invention is to provide a range hood, which includes the above-mentioned bellows flow guide and sound absorption structure, which can reduce the vortex rupture noise at the upper part of the bellows, thereby significantly reducing the noise generated by the fan system of the range hood.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A bellows air flow guide and sound absorption structure of a range hood comprises a bellows and a fan arranged in the bellows, an air inlet space is formed between the air inlet side of the fan and the bellows; an air inlet is arranged at the bottom of the bellows, the air inlet is connected to the air inlet space; a guide plate is arranged at the top of the air inlet space to guide the wind in the air inlet space to the air inlet side of the fan.

[0009] According to one embodiment of the utility model, a first microhole is provided on the guide plate.

[0010] According to one embodiment of the utility model, sound-absorbing cotton is provided on the top surface of the guide plate.

[0011] According to one embodiment of the utility model, a sound absorbing panel is provided on the side wall of the wind box corresponding to the air inlet side of the fan.

[0012] According to one embodiment of the utility model, the sound absorbing plate is provided with second micro holes.

[0013] According to one embodiment of the utility model, sound-absorbing cotton is provided between the sound-absorbing plate and the side wall of the bellows.

[0014] According to one embodiment of the utility model, the bottom end of the sound absorbing board is provided with a flow guide slope extending obliquely toward the side wall of the bellows;

[0015] And / or, the bellows is provided with an inspection door, and the sound absorbing panel and the guide plate are both arranged on the inner side of the inspection door.

[0016] According to one embodiment of the utility model, the angle between the guide plate and the side wall of the wind box is 100°-150°.

[0017] According to one embodiment of the utility model, the projection of the guide plate on the bottom surface of the wind box covers the air inlet.

[0018] The utility model also provides a range hood, comprising the above-mentioned bellows flow guiding and sound absorbing structure of the range hood.

[0019] Compared with the prior art, the advantages and beneficial effects of the embodiments of the present invention are:

[0020] 1) The bellows guide and sound-absorbing structure of the range hood and the range hood provided by the embodiment of the utility model are provided with an inclined guide plate, which can guide the airflow that impacts the top plate of the bellows due to excessive flow rate into the air inlet side of the fan, thereby increasing the air inlet area of ​​the fan in disguised form, while reducing a large number of vortices in the top area of ​​the bellows, reducing the vortex rupture noise, and greatly reducing the noise transmitted when the fan is running.

[0021] 2) The bellows guide and sound-absorbing structure of the range hood and the range hood provided by the embodiment of the utility model are provided with a guide plate and a sound-absorbing plate in the air inlet space. The guide plate guides the airflow into the air inlet side of the fan, effectively increasing the flow area, reducing the fan speed, and reducing the vortex rupture noise on the upper part of the bellows; the sound-absorbing plate can absorb the sound energy transmitted from the inside of the fan, which can greatly reduce the sound pressure level and reduce the noise transmitted when the fan is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0023] Figure 1 A schematic diagram of the internal structure of the wind box flow guide and sound absorption structure of the range hood provided by the embodiment of the utility model;

[0024] Figure 2 A cross-sectional view of the wind box flow guide and sound absorption structure of a range hood provided by an embodiment of the utility model;

[0025] Figure 3 A schematic diagram of the operating principle of the wind box flow guide and sound absorption structure of the range hood provided by the embodiment of the utility model;

[0026] Figure 4 A schematic structural diagram of a guide plate and a sound absorbing plate of a wind box guide and sound absorbing structure of a range hood provided by an embodiment of the utility model;

[0027] Figure 5 A structural schematic diagram of an inspection door of the bellows guide and sound absorption structure of a range hood provided in an embodiment of the utility model.

[0028] Description of reference numerals:

[0029] 1. Bellows; 11. Air inlet; 12. Smoke exhaust outlet; 13. Inspection door; 2. Fan; 21. Air inlet side; 22. Air outlet; 3. Air inlet space; 4. Guide plate; 41. First microhole; 42. First folded edge; 5. Sound-absorbing cotton; 6. Sound-absorbing plate; 61. Second microhole; 62. Second folded edge; 63. Guide slope. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0031] In the description of the present invention, "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, but do not exclude other elements or objects. The directions or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense, for example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through an intermediate component; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] like Figure 1 , Figure 2 As shown, the embodiment of the utility model provides a bellows guide and sound absorption structure of a range hood, comprising a bellows 1 and a fan 2, such as a centrifugal fan, disposed in the bellows 1. An air inlet space 3 is formed between the air inlet side 21 of the fan 2 and the bellows 1, and an air inlet 11 is disposed at the bottom of the bellows 1, the air inlet 11 being connected to the air inlet space 3. A guide plate 4 is disposed at the top of the air inlet space 3 to guide the wind in the air inlet space 3 toward the air inlet side 21 of the fan 2. The guide plate 4 can be disposed on the side wall of the bellows 1 opposite to the air inlet side 21 of the fan 2, and extends obliquely upward toward the fan 2.

[0033] like Figure 3 As shown, when the fan 2 is running, the airflow enters the air inlet space 3 of the wind box 1 from the air inlet 11 below the wind box 1, and enters the fan 2 through the air inlet side 21 of the fan 2 (the airflow direction is shown in FIG. Figure 3 In the direction of the middle arrow), part of the airflow quickly impacts the top of the bellows 1 due to the excessive inlet velocity, forming more vortices, thereby blocking the upper part of the air inlet side 21 of the fan 2 and generating more vortex noise. The bellows flow guide and sound absorption structure of the range hood provided by the embodiment of the utility model adds an inclined guide plate 4, which can guide the airflow that impacts the top plate of the bellows 1 due to excessive flow velocity into the air inlet side 21 of the fan 2, thereby increasing the air inlet area of ​​the fan 2 in disguised form, while reducing a large number of vortices in the top area of ​​the bellows 1, reducing the vortex rupture noise, and greatly reducing the noise transmitted when the fan 2 is running.

[0034] In one embodiment of the present invention, Figure 1, Figure 2 , Figure 4 As shown, the guide plate 4 is provided with a plurality of first micropores 41 for absorbing noise, so that the guide plate 4 can effectively absorb the vortex rupture noise and the noise generated by the operation of the fan 2 while reducing the vortex rupture noise at the top of the bellows 1, and further reduce the noise transmitted during the operation of the system. The diameter of the first micropores 41 is preferably 1mm-8mm, and the spacing is 1mm-8mm. Preferably, the top surface of the guide plate 4 is provided with sound-absorbing cotton 5 to further improve the effect of the guide plate 4 in absorbing noise. The material of the sound-absorbing cotton 5 is melamine, polyurethane or other materials with sound-absorbing effect, and the thickness is preferably 5mm-30mm. The edge of the guide plate 4 extends upward with a first folded edge 42 for positioning the sound-absorbing cotton 5.

[0035] In order to guide the wind in the air inlet space 3 to the air inlet side 21 of the fan 2 to the greatest extent to reduce the vortex breakup noise in the top area of ​​the wind box 1, the angle between the guide plate 4 and the side wall of the wind box 1 is 100°-150°. The width of the guide plate 4 is to ensure a safe distance from the front cover plate of the wind box 1 and the top plate of the wind box 1, which is generally 5mm-15mm. The upper end point of the guide plate 4 is slightly higher or flush with the air inlet side 21 of the fan 2. Preferably, the projection of the guide plate 4 on the bottom surface of the wind box 1 covers the air inlet 11, so that the airflow entering the air inlet space 3 from the air inlet 11 can be completely introduced into the air inlet side 21 of the fan 2.

[0036] In an embodiment of the present invention, the bellows 1 is in a rectangular shape, with the air inlet 11 at the bottom and the smoke exhaust port 12 at the top, and the air outlet 22 of the fan 2 is connected to the smoke exhaust port 12 .

[0037] As a preferred embodiment of the present invention, Figure 1 , Figure 2 As shown, in addition to the guide plate 4 in the above embodiment, the side wall of the wind box 1 corresponding to the air inlet side 21 of the fan 2 is provided with a sound absorbing plate 6, which can absorb the noise during the operation of the fan 2 and further reduce the noise transmitted during the operation of the fan 2.

[0038] In this embodiment, a guide plate 4 and a sound absorbing plate 6 are provided in the air inlet space 3. The guide plate 4 guides the airflow into the air inlet side 21 of the fan 2, effectively increasing the flow area, reducing the rotation speed of the fan 2, and reducing the vortex rupture noise at the top of the bellows 1; the sound absorbing plate 6 can absorb the sound energy propagated from the inside of the fan 2, which can greatly reduce the sound pressure level.

[0039] In order to improve the noise absorbing effect of the sound absorbing board 6, Figure 1 , Figure 2 , Figure 4As shown, the sound absorbing board 6 is provided with a plurality of second micropores 61. The diameter of the second micropores 61 is preferably 1mm-8mm, and the spacing is 1mm-8mm. Furthermore, a sound absorbing cotton 5 is also provided between the sound absorbing board 6 and the side wall of the bellows 1 (i.e., the back of the sound absorbing board 6). The material of the sound absorbing cotton 5 is melamine, polyurethane or other materials with sound absorbing effect, and the thickness is preferably 5mm-30mm. The edge of the sound absorbing board 6 is extended toward the side wall of the bellows 1 and provided with a second folded edge 62 for positioning the sound absorbing cotton 5.

[0040] Since the sound absorbing board 6 has a certain thickness, in order to reduce the wind resistance when the airflow moves upward from the air inlet 11, as shown in FIG. Figure 1 , Figure 4 As shown, the bottom end of the sound absorbing plate 6 is provided with a guide slope 63 which extends obliquely toward the side wall of the bellows 1 .

[0041] In one embodiment of the present invention, Figure 1 , Figure 5 As shown, the bellows 1 is provided with an openable or detachable inspection door 13, and the sound absorbing plate 6 and the guide plate 4 are both arranged on the inner side of the inspection door 13, so as to facilitate the maintenance and replacement of the guide plate 4, the sound absorbing plate 6 and the fan 2.

[0042] In one embodiment of the utility model, the height of the sound absorbing panel 6 can be adjusted according to the specific structure. The preferred solution is that the lower end of the sound absorbing panel 6 is flush with the lower edge of the bellows 1 or 20% lower than the lower edge of the bellows 1 by the height of the bellows 1, and the upper end of the sound absorbing panel 6 has a height range from 2 / 3 of the air inlet side of the fan 2 to the uppermost end of the air inlet side 21 of the fan 2.

[0043] The utility model also provides a range hood, comprising the above-mentioned wind box flow guide sound absorption structure of the range hood. The range hood can be a range hood with an upper or middle fan system, and compared with the existing range hood, it can significantly reduce the mid- and high-frequency noise, and the prototype verification can reduce the noise by 1.3dB.

[0044] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A bellows flow guide and sound absorption structure for a range hood, characterized in that: The invention comprises a wind box (1) and a fan (2) arranged in the wind box (1), wherein an air inlet space (3) is formed between an air inlet side (21) of the fan (2) and the wind box (1); an air inlet (11) is arranged at the bottom of the wind box (1), and the air inlet (11) is connected to the air inlet space (3); and a guide plate (4) is arranged at the top of the air inlet space (3) to guide the wind in the air inlet space (3) to the air inlet side (21) of the fan (2).

2. The bellows flow guide and sound absorption structure of a range hood according to claim 1, characterized in that: The guide plate (4) is provided with a first microhole (41).

3. The bellows flow guide and sound absorption structure of a range hood according to claim 2, characterized in that: The top surface of the guide plate (4) is provided with sound-absorbing cotton (5).

4. The wind box flow guide and sound absorption structure of a range hood according to any one of claims 1 to 3, characterized in that: A sound absorbing panel (6) is provided on the side wall of the wind box (1) corresponding to the air inlet side (21) of the fan (2).

5. The bellows flow guide and sound absorption structure of the range hood according to claim 4, characterized in that: The sound absorbing plate (6) is provided with second micro holes (61).

6. The bellows flow guide and sound absorption structure of a range hood according to claim 5, characterized in that: Sound-absorbing cotton (5) is provided between the sound-absorbing plate (6) and the side wall of the bellows (1).

7. The wind box flow guide and sound absorption structure of a range hood according to claim 6, characterized in that: The bottom end of the sound absorbing plate (6) is provided with a flow guiding inclined surface (63) extending obliquely toward the side wall of the bellows (1); And / or, the wind box (1) is provided with an inspection door (13), and the sound absorbing plate (6) and the guide plate (4) are both arranged on the inner side of the inspection door (13).

8. The wind box flow guide and sound absorption structure of a range hood according to any one of claims 1 to 3, characterized in that: The included angle between the guide plate (4) and the side wall of the wind box (1) is 100°-150°.

9. The wind box flow guiding and sound absorbing structure of a range hood according to any one of claims 1 to 3, characterized in that: The projection of the guide plate (4) on the bottom surface of the wind box (1) covers the air inlet (11).

10. A range hood, characterized in that: The invention comprises a bellows flow guiding and sound absorbing structure of a range hood according to any one of claims 1 to 9.

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