Range hood and sound absorption and noise reduction module thereof

Abstract

The utility model provides an improved range hood and a sound absorption and noise reduction module thereof. The embodiment of the utility model provides a sound absorption and noise reduction module for a range hood. The sound absorption and noise reduction module comprises a sound absorption unit and an electric heating unit, the electric heating unit is arranged to be suitable for heating the sound absorption unit. Therefore, the sound absorption unit can be kept dry, and the noise reduction effect of the sound absorption unit can be maintained.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of range hood, in particular to the noise reduction technology of range hood.

BACKGROUND

[0002] In Asian regions, due to the traditional cooking habit of stir-frying, the oil content in the smoke generated during cooking is particularly high. Therefore, the range hood for extracting and exhausting the oil smoke generated during cooking has become an important household appliance indispensable to daily life. With the continuous improvement of people's requirements for life quality, the range hood is also constantly upgrading.

[0003] In order to reduce the noise of the range hood and improve the user experience, a range hood with sound-absorbing cotton has been proposed. However, due to the work in the oil smoke environment, the sound-absorbing cotton is easy to attach oil, water and other stains to block its sound-absorbing holes, so that the noise reduction effect is not ideal.

[0004] Unless sufficient evidence is provided, the prior art described herein does not mean that these prior art is admitted to be known to those skilled in the art related to the present application before the filing date of the present application.

SUMMARY

[0005] One purpose of the embodiments of the present application is to propose an improved range hood and its sound-absorbing and noise-reducing module for at least one of the above technical problems and / or other possible technical problems not mentioned in the present application.

[0006] According to a first aspect of the present application, the embodiments of the present application provide a sound-absorbing and noise-reducing module for a range hood, comprising a sound-absorbing unit and an electric heating unit; the electric heating unit is arranged to heat the sound-absorbing unit. Since the electric heating unit heats the sound-absorbing unit, it helps to keep the sound-absorbing unit dry and maintain its noise reduction effect.

[0007] In one or some embodiments, the electric heating unit comprises an electric heating film and a protective cover; the electric heating film is arranged on the inner side of the protective cover; and the sound-absorbing unit is wrapped on the outer side of the protective cover. In this way, the protective cover is arranged between the electric heating film and the sound-absorbing unit, which helps to avoid the sound-absorbing unit being heated too high by the electric heating film.

[0008] In one or some embodiments, the protective cover is in the form of a groove; a groove edge of the protective cover is configured to press and fix the electric heating film to the range hood; and a space is provided between the electric heating film and a groove bottom of the protective cover. The space provided between the electric heating film and the groove bottom of the protective cover helps to avoid the sound absorption unit from being heated to a too high temperature by the electric heating film. Meanwhile, the protective cover is used for two purposes by pressing and fixing the electric heating film to the range hood through the groove edge of the protective cover, which simplifies the fixing structure of the electric heating film and saves costs.

[0009] In one or some embodiments, the electric heating unit is embedded in the sound absorption unit; and / or

[0010] The sound absorption unit is coated with an oil-repellent coating; and / or

[0011] The sound absorption unit is provided with sound absorption holes; and / or

[0012] The sound absorption unit comprises sound absorption cotton.

[0013] Since the electric heating unit heats the sound absorption cotton, the sound absorption cotton can be kept dry, the porosity of the sound absorption cotton can be ensured, and the noise reduction effect of the sound absorption cotton can be maintained.

[0014] According to a second aspect of the present application, embodiments of the present application provide a range hood comprising the sound absorption and noise reduction module as described in any one of the above.

[0015] In one or some embodiments, the range hood comprises a housing; the sound absorption and noise reduction module is fixed to an inner wall of the housing; the electric heating unit is attached to the inner wall of the housing and located between the inner wall of the housing and the sound absorption unit; and the electric heating unit is configured to heat the sound absorption unit and the housing at the same time. In this way, the electric heating unit can heat the sound absorption unit to keep the sound absorption unit dry and maintain the noise reduction effect of the sound absorption unit, and can also heat the housing to achieve self-cleaning of the range hood, achieving two purposes at once.

[0016] In one or some embodiments, the sound absorption and noise reduction module is arranged in an airflow passage of the range hood, the housing is integrally formed with a groove portion, and the sound absorption and noise reduction module is embedded in the groove portion; and / or

[0017] The number of the sound absorption and noise reduction modules is two, one of which is fixed to a left side wall of the housing and the other of which is fixed to a right side wall of the housing.

[0018] The sound absorption and noise reduction module is embedded in the groove portion, which helps to reduce the obstruction of the sound absorption and noise reduction module to the airflow in the airflow passage of the range hood.

[0019] In one or some embodiments, the sound absorption and noise reduction module is arranged in the air flow channel of the range hood; the casing is integrally formed with two recessed portions, one of which is located at the left side wall of the casing and the other of which is located at the right side wall of the casing; the sound absorption and noise reduction module is two in number and corresponds to the two recessed portions one by one; the sound absorption and noise reduction module is embedded in the corresponding recessed portion; the range hood comprises a centrifugal fan arranged in the casing and located between the two sound absorption and noise reduction modules.

[0020] According to a third aspect of the present application, the embodiments of the present application provide a range hood comprising the sound absorption and noise reduction module as described above; the range hood comprises a casing and a centrifugal fan arranged in the casing; the volute of the centrifugal fan comprises a first side wall, a second side wall and a ring wall; the ring wall is arranged between the first side wall and the second side wall; the protective cover is in the shape of an arc plate with an opening facing upward; the electric heating film, the protective cover and the sound absorption unit are sequentially wrapped from inside to outside on the outer surface of the ring wall; the electric heating unit is arranged to be suitable for heating the ring wall while heating the sound absorption unit. In this way, the electric heating unit can not only heat the sound absorption unit to keep the sound absorption unit dry and maintain its noise reduction effect, but also heat the volute to achieve self-cleaning of the range hood, achieving two goals at once.

[0021] In one or some embodiments, the ring wall is provided with an oil leakage hole; the electric heating film is provided with a first through hole; the protective cover is provided with a second through hole; the sound absorption unit is provided with a third through hole; the oil leakage hole, the first through hole, the second through hole and the third through hole are coincident with each other and are sequentially arranged from top to bottom.

[0022] It should be noted here that the directional expressions such as "left side wall", "right side wall", "from top to bottom", "upward", "lowest point" appearing in the present application are based on the normal use state of the range hood unless otherwise specified.

[0023] It should be noted here that the "first", "second" and "third" appearing in the specification are only for descriptive purposes and do not indicate relative importance; moreover, they do not limit the number of features they define; in addition, they also do not limit the logical relationship or order relationship of the features they define.

[0024] The above technical solution content of the present application is not used to describe all possible embodiments of the present application. Throughout the application, examples are provided by listing to guide, which can be used in various feasible combinations. BRIEF DESCRIPTION OF DRAWINGS

[0025] The following drawings only schematically illustrate and explain the present application and do not limit the scope of the present application, in which:

[0026] Figure 1 This is a partial structural schematic diagram of an embodiment of a range hood according to this application;

[0027] Figure 2 yes Figure 1 Exploded view of the structure shown;

[0028] Figure 3 yes Figure 1 A partial sectional view of the structure shown;

[0029] Figure 4 This is an exploded view of the centrifugal fan and related structures of another embodiment of the range hood in this application;

[0030] Figure 5 This is a schematic diagram of the centrifugal fan in another embodiment of the range hood of this application;

[0031] Figure 6 This is a schematic diagram of the structure of the heating film in another embodiment of the range hood of this application.

[0032] Figure label:

[0033] 1-Casing, 2-Left side wall, 3-Right side wall, 4-Front wall, 5-Top wall, 6-Recess, 7-Heating film, 8-First through hole, 9-Power supply cable, 10-Double-sided adhesive, 11-Sound absorbing cotton, 12-Fixing bracket, 13-First side wall, 14-Ring wall, 15-Impeller, 16-Motor, 17-Protective cover, 18-Gap space, 19-Oil leakage hole, 20-Bracket.

Detailed Implementation Methods

[0034] To make the technical problems to be solved, the technical solutions, and the beneficial technical effects of this application clearer, the following will provide a more detailed description of this application in conjunction with the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit the scope of protection of this application. Various embodiments may share the same view or multiple views for description, but not all features appearing in the same view should be interpreted as features that an embodiment must possess. Instead, they can be combined in any suitable manner as long as they are not technically mutually exclusive. Moreover, for the sake of brevity, different embodiments of different aspects may be presented in the same specific design; however, such presentation does not mean that embodiments of these aspects should appear together. The disassembly and / or combination of all possible embodiments and / or technical features should also take into account the description in the specification and what a person skilled in the art can directly and unambiguously determine based on the description in the specification.

[0035] Example 1

[0036] This application discloses an embodiment of a range hood, comprising a housing 1, a smoke collection hood, a centrifugal fan, and a sound absorption and noise reduction module. The housing 1 and the smoke collection hood are arranged sequentially from top to bottom. The centrifugal fan is disposed inside the housing 1. When the centrifugal fan operates, it generates negative pressure, forming an airflow of cooking fumes. The smoke collection hood gathers the cooking fumes and guides them into the housing 1. After flowing into the housing 1, the cooking fumes first pass through the centrifugal fan, then exit the housing 1, then flow into the exhaust pipe, and finally are discharged into the common flue.

[0037] The casing 1 is generally rectangular in shape. Casing 1 includes a left side wall 2, a right side wall 3, a front wall 4, a rear wall, and a top wall 5, as shown below. Figure 1 and 2 As shown. The left side wall 2 and the right side wall 3 are arranged facing each other. The front wall 4 and the rear wall are arranged facing each other. It should be noted that... Figure 1 and 2 The rear wall is not shown. An air inlet is provided at the bottom of the housing 1, allowing the oily fumes collected by the fume hood to flow upwards and into the housing 1. The air inlet and the top wall 5 are arranged facing each other.

[0038] The sound absorption and noise reduction module is installed within the airflow channel of the range hood. Specifically, the sound absorption and noise reduction module is fixed to the inner wall of the casing 1, such as... Figure 1 As shown. There are two sound absorption and noise reduction modules, one fixed to the left side wall 2 of the housing 1, and the other fixed to the right side wall 3 of the housing 1, as shown. Figure 1 As shown. Two sound-absorbing and noise-reducing modules are positioned facing each other. The two sound-absorbing and noise-reducing modules are arranged symmetrically. It should be noted that... Figure 1 Only one sound-absorbing and noise-reducing module is visible, while the other sound-absorbing and noise-reducing module is obscured by the casing 1.

[0039] The sound absorption and noise reduction module includes a sound absorption unit and an electric heating unit, such as... Figures 1 to 3 As shown, the sound-absorbing unit is designed to absorb the noise generated by the range hood, especially the noise within the airflow duct. The sound-absorbing unit helps reduce the noise level of the range hood to some extent.

[0040] The electric heating unit is designed to heat the sound-absorbing unit. Heating by the electric heating unit helps keep the sound-absorbing unit dry to a certain extent, thus maintaining its noise reduction effect. In particular, considering that the sound-absorbing module is located within the airflow channel of the range hood, and its operating environment is often characterized by grease and moisture, using the electric heating unit helps keep the sound-absorbing unit dry, ensuring its long-term effectiveness in sound absorption and noise reduction. Furthermore, the sound-absorbing unit is coated with an oleophobic coating; this helps reduce the adhesion of grease or water to the sound-absorbing unit, further contributing to its dryness and ensuring its long-term effectiveness in sound absorption and noise reduction.

[0041] The sound-absorbing unit is equipped with sound-absorbing holes. The sound-absorbing unit includes sound-absorbing cotton 11. The material of the sound-absorbing cotton 11 is recycled foam, PE foam, PU foam, felt, or other suitable materials. The electric heating unit is attached to the inner wall of the housing 1, located between the inner wall of the housing 1 and the sound-absorbing unit, such as... Figure 3 As shown. The electric heating unit is configured to heat the housing 1 simultaneously with the sound-absorbing unit. The sound-absorbing cotton 11 has good heat insulation properties, effectively preventing the heat generated by the electric heating unit from radiating into the air, allowing more heat to be used to heat the housing 1, causing the grease adhering to the housing 1 to melt and flow into the oil cup, thus achieving a better self-cleaning effect.

[0042] The housing 1 has two integrally formed recesses 6, one integrally formed on the left side wall 2 of the housing 1, and the other integrally formed on the right side wall 3 of the housing 1, as shown below. Figure 2 As shown, two sound-absorbing and noise-reducing modules correspond one-to-one with two recessed portions 6. The sound-absorbing and noise-reducing modules are embedded in the corresponding recessed portions 6, as shown... Figure 1 As shown. Specifically, there are two sound-absorbing and noise-reducing modules, one located on the left side wall 2 of the housing 1 and the other located on the right side wall 3 of the housing 1.

[0043] The centrifugal fan, housed within the casing 1, is positioned between the two sound-absorbing and noise-reducing modules. The centrifugal fan's volute includes a first sidewall 13, a second sidewall, and an annular wall 14, as shown... Figure 4 and 5 As shown. An annular wall 14 is connected between the first sidewall 13 and the second sidewall. The first sidewall 13 and / or the second sidewall are provided with air inlets. An air outlet is provided at the top of the volute. The air outlet is formed by the top edges of the first sidewall 13, the second sidewall, and the annular wall 14.

[0044] Two sound-absorbing and noise-reducing modules are arranged, one facing the first sidewall 13 of the volute and the other facing the second sidewall of the volute. Thus, the two sound-absorbing and noise-reducing modules efficiently absorb the noise generated by the centrifugal fan. In particular, considering that the centrifugal fan is the main noise source of the range hood, placing the centrifugal fan between the two sound-absorbing and noise-reducing modules helps to significantly reduce the noise of the range hood.

[0045] The electric heating unit includes an electric heating film 7 and a protective cover 17, such as Figure 2 and 3As shown. The heating film 7 is disposed inside the protective cover 17. The sound-absorbing unit covers the outside of the protective cover 17. The protective cover 17 is groove-shaped. The groove edge of the protective cover 17 is configured to press and fix the heating film 7 to the range hood. The groove edge of the protective cover 17 is provided with mounting holes so that screws can pass through to fix the protective cover 17 into the groove portion 6. Correspondingly, the groove portion 6 is provided with screw holes for the screws to pass through. After fixing, a certain gap space 18 is provided between the heating film 7 and the bottom of the groove of the protective cover 17, such as... Figure 3 As shown.

[0046] Although the electric heating unit is configured to heat the housing 1 simultaneously with the sound-absorbing unit, the temperature of the sound-absorbing unit is lower than the temperature of the housing 1 when the electric heating unit heats both the sound-absorbing unit and the housing 1 because there is a protective cover 17 and a space 18 between the electric heating film 7 and the sound-absorbing unit. In this embodiment, when the electric heating unit heats both the sound-absorbing unit and the housing 1 simultaneously, the temperature of the housing 1 can reach above 70°C, effectively achieving self-cleaning; the temperature of the sound-absorbing cotton 11 is maintained between 50°C and 60°C, which keeps the sound-absorbing cotton 11 dry, effectively ensuring its sound absorption effect, and preventing it from overheating and aging.

[0047] During assembly, first attach the heating film 7 to the groove 6, then fix the protective cover 17 to the groove 6, then wrap the sound-absorbing cotton 11 around the protective cover 17, and then fix the fixing bracket 12 to the housing 1. The fixing bracket 12 squeezes and fixes the sound-absorbing cotton 11 into the corresponding groove 6. That is, the fixing bracket 12 tightly squeezes the sound-absorbing cotton 11 onto the outer wall of the covered protective cover 17, thus completing the fixing of the sound absorption and noise reduction module.

[0048] Example 2

[0049] Exemplarily, this application also proposes another embodiment of a range hood, including a housing 1, a smoke collection hood, a centrifugal fan, and a sound absorption and noise reduction module. The housing 1 and the smoke collection hood are arranged sequentially from top to bottom. The centrifugal fan includes a volute, an impeller 15, and a motor 16, as shown below. Figure 4 and 5 As shown, the impeller 15 and motor 16 are housed within the volute. The motor 16 is adapted to drive the impeller 15 to rotate, thereby creating a negative pressure and generating an oil fume airflow. The fume hood gathers the oil fume airflow and guides it into the casing 1. After flowing into the casing 1, the oil fume airflow first passes through the centrifugal fan, then exits the casing 1, then flows into the exhaust pipe, and finally is discharged into the common flue.

[0050] A centrifugal fan is installed inside the casing 1. The centrifugal fan is equipped with a support 20, such as... Figure 5As shown. The bracket 20 is used to fix the centrifugal fan inside the casing 1. The centrifugal fan casing includes a first side wall 13, a second side wall, and an annular wall 14. The annular wall 14 is connected between the first side wall 13 and the second side wall, as shown. Figure 4 and 5 As shown.

[0051] The sound-absorbing and noise-reducing module includes a sound-absorbing unit and an electric heating unit. The electric heating unit is configured to heat the sound-absorbing unit. The electric heating unit includes a heating film 7 and a protective cover 17, such as... Figure 4 As shown. The heating film 7 is disposed inside the protective cover 17. The sound-absorbing unit covers the outside of the protective cover 17. The protective cover 17 is groove-shaped. The groove edge of the protective cover 17 is configured to press and fix the heating film 7 to the annular wall 14. Specifically, the protective cover 17 is an arc-shaped plate with the opening facing upwards. The heating film 7, the protective cover 17, and the sound-absorbing unit sequentially cover the outer surface of the annular wall 14 from the inside out, as shown. Figure 4 As shown. The sound-absorbing unit includes sound-absorbing cotton 11. The material of the sound-absorbing cotton 11 is recycled foam, PE foam, PU foam, felt, or other feasible materials.

[0052] The heating film 7 is square. It should be noted that "the heating film 7 is square" can be understood as meaning that the heating film 7 is square when laid flat, such as... Figure 6 As shown. It should be noted that the heating film 7 is a flexible component, adapted to bend to fit the structure of the outer surface of the annular wall 14 to which it is attached. When the heating film 7 is attached to the outer surface of the annular wall 14, as... Figure 5 As shown.

[0053] When the centrifugal fan is running, it generates negative pressure, forming an oily fume airflow. The oily fume airflow flows into the centrifugal fan casing from the air inlet, flows through the inner cavity of the casing, and then flows out from the air outlet of the casing. Because the oily fume airflow carries a large amount of grease, much of the grease will eventually adhere to the inner wall of the casing and converge towards the bottom area of ​​the casing under the action of gravity.

[0054] The electric heating unit is configured to heat the annular wall 14 simultaneously with the sound-absorbing unit. The annular wall 14 is provided with an oil drain hole 19. The oil drain hole 19 is located at the lowest point of the volute, such as... Figure 5 As shown. The electric heating film 7 has a first through hole 8, as shown. Figure 6 As shown. The protective cover 17 has a second through hole. The sound-absorbing unit has a third through hole. The oil leakage hole 19, the first through hole 8, the second through hole, and the third through hole overlap and are arranged sequentially from top to bottom, as shown. Figure 4 As shown.

[0055] The electric heating film 7 is equipped with two power supply cables 9, such as... Figure 6As shown. Power supply cable 9 is used to supply power to the heating film 7. The range hood is equipped with a power supply module and a control module. The power supply module is configured to supply power to the power supply cable 9. The control module is configured to control the on / off state of the power supply from the power supply module to the power supply cable 9.

[0056] When the heating film 7 is energized, it heats the outer surface of the ring wall 14, thereby raising the temperature of the volute. This causes the grease adhering inside the volute to liquefy and flow sequentially through the oil drain hole 19, the first through hole 8, the second through hole, and the third through hole before being discharged. The grease then flows downwards and finally into the grease cup of the range hood, achieving self-cleaning. In particular, considering that grease accumulates in the bottom area of ​​the volute, the outer surface of the ring wall 14 heated by the heating film 7 is precisely the outer wall of the bottom area of ​​the volute. This targeted approach allows for efficient heating and melting of the grease, resulting in a good self-cleaning effect for the range hood.

[0057] During assembly, first place the heating film 7 on the outer surface of the ring wall 14, such as... Figure 5 As shown. Double-sided adhesive tape 10 is provided at each of the four corners of the heating film 7, as... Figure 6 As shown. The area of ​​the double-sided adhesive 10 at any corner of the heating film 7 shall not exceed 150 mm². 2 Preferably, the double-sided adhesive tape 10 at each corner of the heating film 7 is a square with a side length of 10mm. This results in a small area of ​​double-sided adhesive tape 10, making it easier for the heating film 7 to pass the needle flame test, and also reducing the amount of double-sided adhesive tape used, thus saving costs. After the heating film 7 is fixed to the outer surface of the ring wall 14 using double-sided adhesive tape 10, the protective cover 17 is then fixed to the outer surface of the ring wall 14. When the protective cover 17 is fixed to the outer surface of the ring wall 14, the edge of the protective cover 17 presses the heating film 7 towards the outer surface of the ring wall 14, thus firmly fixing the heating film 7 between the outer surface of the ring wall 14 and the protective cover 17. In short, the double-sided adhesive tape 10 is used to pre-fix the heating film 7 to the outer surface of the ring wall 14, and the heating film 7 is ultimately firmly fixed to the outer surface of the ring wall 14 by the pressure of the protective cover 17. Because it is obscured by the protective cover 17, the heating film 7 is not visible. A certain gap is provided between the heating film 7 and the bottom of the protective cover 17.

[0058] Although the electric heating unit is configured to heat the volute while simultaneously heating the sound-absorbing unit, the temperature of the sound-absorbing unit is lower than that of the volute when the electric heating unit heats both the sound-absorbing unit and the volute simultaneously, due to the protective cover 17 and the space between the electric heating film 7 and the sound-absorbing unit. In this embodiment, when the electric heating unit heats both the sound-absorbing unit and the volute simultaneously, the temperature of the volute can reach above 70°C, effectively achieving self-cleaning; the temperature of the sound-absorbing cotton 11 is maintained between 50°C and 60°C, which keeps the sound-absorbing cotton 11 dry, effectively ensuring its sound absorption effect, and preventing it from overheating and aging.

[0059] Example 3

[0060] Exemplarily, this application also proposes an embodiment of a sound-absorbing and noise-reducing module for a range hood, including a sound-absorbing unit and an electric heating unit. The electric heating unit is configured to heat the sound-absorbing unit. Heating by the electric heating unit helps keep the sound-absorbing unit dry to a certain extent, thus maintaining its noise-reducing effect. In particular, considering that the sound-absorbing and noise-reducing module is located within the airflow channel of the range hood, and that its application environment often involves grease and moisture, heating the sound-absorbing unit with an electric heating unit helps keep it dry and maintains its sound-absorbing and noise-reducing function effectively for a long time. Furthermore, the sound-absorbing unit is coated with an oleophobic coating; this helps reduce the adhesion of grease or water to the sound-absorbing unit, further helping to keep it dry and maintain its sound-absorbing and noise-reducing function effectively for a long time.

[0061] An electric heating unit is embedded within a sound-absorbing unit. The sound-absorbing unit includes sound-absorbing cotton. The electric heating unit is wrapped and hidden within the sound-absorbing cotton. Thus, the electric heating unit is concealed by the sound-absorbing cotton and is not visible. Specifically, the sound-absorbing cotton is made of recycled foam, PE foam, PU foam, felt, or other suitable materials. This embodiment focuses on illustrating the differences from the above embodiments; similar or identical parts of this embodiment can be referred to in the above embodiments.

[0062] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of this application, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this application are intended to be illustrative and not limiting, unless explicitly stated otherwise. In practice, multiple features can be combined with each other where technically feasible and according to actual needs. Various substitutions, modifications, and alterations are also conceived without departing from the spirit and scope of this application.

Claims

1. A sound absorption and noise reduction module for a range hood, characterized in that: comprising a sound absorption unit and an electric heating unit; the electric heating unit is arranged to heat the sound absorption unit; the electric heating unit comprises an electric heating film (7) and a protective cover (17); the electric heating film (7) is arranged on the inner side of the protective cover (17); the sound absorption unit is wrapped on the outer side of the protective cover (17). 2.The sound absorption and noise reduction module according to claim 1, characterized in that: the protective cover (17) is in the form of a groove; the groove edge of the protective cover (17) is arranged to press and fix the electric heating film (7) to the range hood; a certain interval space (18) is arranged between the electric heating film (7) and the groove bottom of the protective cover (17). 3.The sound absorption and noise reduction module according to claim 1, characterized in that: the electric heating unit is embedded in the sound absorption unit; and / or the sound absorption unit is coated with an oil-repellent coating; and / or the sound absorption unit is provided with sound absorption holes; and / or the sound absorption unit comprises sound absorption cotton (11). 4.A range hood, characterized in that: comprising the sound absorption and noise reduction module according to any one of claims 1 to 3. 5.The range hood according to claim 4, characterized in that: the range hood comprises a housing (1); the sound absorption and noise reduction module is fixed to the inner wall of the housing (1); the electric heating unit is attached to the inner wall of the housing (1) and is located between the inner wall of the housing (1) and the sound absorption unit; the electric heating unit is arranged to heat the housing (1) while heating the sound absorption unit. 6.The range hood according to claim 5, characterized in that: the sound absorption and noise reduction module is arranged in the airflow channel of the range hood, the housing (1) is integrally formed with a groove portion (6), and the sound absorption and noise reduction module is embedded in the groove portion (6); and / or the number of sound absorption and noise reduction modules is two, one of which is fixed to the left side wall (2) of the housing (1) and the other of which is fixed to the right side wall (3) of the housing (1). 7.The range hood according to claim 5, characterized in that: the sound absorption and noise reduction module is arranged in the airflow channel of the range hood; the housing (1) is integrally formed with two groove portions (6), one of which is located on the left side wall (2) of the housing (1) and the other of which is located on the right side wall (3) of the housing (1); the number of sound absorption and noise reduction modules is two, corresponding to the two groove portions (6); the sound absorption and noise reduction module is embedded in the corresponding groove portion (6); the range hood comprises a centrifugal fan arranged in the housing (1) and located between the two sound absorption and noise reduction modules. 8.A range hood, characterized in that: comprising the sound absorption and noise reduction module according to claim 2; the range hood comprises a housing (1) and a centrifugal fan arranged in the housing (1); the volute of the centrifugal fan comprises a first side wall (13), a second side wall and a ring wall (14); the ring wall (14) is arranged between the first side wall (13) and the second side wall; ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The protective cover (17) is in the shape of an arc-shaped plate with an opening facing upwards. The electric heating film (7), the protective cover (17) and the sound absorption unit are sequentially wrapped on the outer surface of the ring wall (14) from inside to outside. The electric heating unit is adapted to heat the ring wall (14) while heating the sound absorption unit.

9. The extractor hood according to claim 8, characterized in that: The ring wall (14) is provided with an oil leakage hole (19). The electric heating film (7) is provided with a first through hole (8). The protective cover (17) is provided with a second through hole. The sound absorption unit is provided with a third through hole. The oil leakage hole (19), the first through hole (8), the second through hole and the third through hole are coincident with each other and are sequentially arranged from top to bottom.

Images