Silencers, fan assemblies and range hoods

Abstract

The present invention provides a silencer, a fan assembly and a range hood, wherein the silencer comprises: a first silencer, the first silencer comprises a first shell, the first shell has an air inlet, an air outlet and a first silencer cavity connected to the air inlet and the air outlet, so that the noise entering from the air inlet is discharged from the air outlet after being reduced in noise by the first silencer cavity; wherein the first silencer is used to be arranged on the outer shell of the part to be silenced, the first silencer is located outside the outer shell of the part to be silenced, and the air inlet is arranged toward the noise reduction port of the part to be silenced, so as to solve the technical problem that the noise reduction structure in the prior art may affect the performance of the fan assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a muffler, a fan assembly and a range hood. Background Art

[0002] At present, as the top priority of the kitchen, the range hood is an indispensable kitchen appliance for every household. The range hood can remove all the fumes generated during cooking, thereby purifying the kitchen environment. In order to quickly remove the fumes in the kitchen, many brands of range hoods will increase the air volume in their designs. As the air volume increases, the noise generated inside the volute becomes louder and louder, which has a great impact on people inside the kitchen. When the range hood is working, the noise of the rotating impeller not only propagates along the airflow in the pipeline, but also radiates noise outward through the casing. The faster the motor speed, the louder the noise generated by the rotating impeller, which will also have a certain impact on human hearing. In the existing technology, sound-absorbing cotton or sponge is used inside the volute to reduce noise.

[0003] However, adopting such a structural setting requires installing a noise reduction structure inside the volute, and certain improvements need to be made to the internal structure of the volute, which will have a certain impact on the internal structure of the volute and may even directly affect the fan structure and the performance of the range hood. Summary of the invention

[0004] The main purpose of the present invention is to provide a silencer, a fan assembly and a range hood to solve the technical problem in the prior art that the noise reduction structure may affect the performance of the fan assembly.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a silencer device is provided, comprising: a first silencer part, the first silencer part comprising a first shell, the first shell having an air inlet part, an air outlet part and a first silencer cavity connected to both the air inlet part and the air outlet part, so that the noise entering from the air inlet part can be discharged from the air outlet part after being reduced in noise by the first silencer cavity; wherein the first silencer part is used to be arranged on the outer shell of the part to be silenced, the first silencer part is located outside the outer shell of the part to be silenced, and the air inlet part is arranged toward the noise reduction port of the part to be silenced.

[0006] Further, the first shell has a noise reduction hole; the noise reduction hole is arranged at the air inlet; and / or the noise reduction hole is arranged at the air outlet.

[0007] Further, the cross-sectional area of ​​the first silencer cavity is larger than the air inlet cross-sectional area of ​​the air inlet portion; and / or the cross-sectional area of ​​the first silencer cavity is larger than the air outlet cross-sectional area of ​​the air outlet portion.

[0008] Furthermore, the first sound-absorbing part also includes a first sound-absorbing cotton; the first sound-absorbing cotton is arranged at the air inlet; and / or the first sound-absorbing cotton is arranged in the first sound-absorbing cavity.

[0009] Furthermore, the first silencer part further includes: a first fixing seat, the first shell is arranged on the first fixing seat, and the first fixing seat is used to be fixed on the outer shell of the part to be silenced.

[0010] Furthermore, a connecting piece is provided on the first shell, and a connecting hole matched with the connecting piece is provided on the first fixing seat, and the connecting piece is inserted into the connecting hole so that the first shell is arranged on the first fixing seat.

[0011] Furthermore, the first silencer part also includes a snap-in connector, and the connecting part is provided with a plug-in hole adapted to the snap-in connector; the connecting hole includes a first connecting part and a second connecting part which are interconnected, so that after the snap-in connector is inserted into the plug-in hole, the connecting part is arranged in the first connecting part and the snap-in connector is clamped in the second connecting part.

[0012] Furthermore, a avoidance hole is also provided on the first fixing seat. The avoidance hole is arranged opposite to the air inlet portion, and the avoidance hole is used to avoid the noise reduction port on the silencer.

[0013] Furthermore, the silencer device further includes: a second silencer portion having a second silencer cavity, and the air outlet portion is communicated with the second silencer cavity so as to reduce the noise discharged from the air outlet portion through the second silencer cavity.

[0014] Furthermore, the second silencer includes: a second shell and a second fixed seat, the second shell is arranged on the second fixed seat, the second shell has a sound transmission channel and a second silencer cavity, the inlet end of the sound transmission channel is used to communicate with the outside air, and the outlet end of the sound transmission channel can be selectively connected with the second silencer cavity to reduce the noise transmitted from the sound transmission channel through the second silencer cavity.

[0015] Furthermore, the second silencer part also includes: a detection member, which is arranged on the second fixed seat, and the detection end of the detection member is used to sense the noise of the external air; a control member, which is connected to the detection member, so that the control member controls the connection or disconnection of the sound transmission channel and the second silencer cavity according to the noise situation detected by the detection member.

[0016] Furthermore, there are multiple first silencers, which are spaced apart on the outer shell of the part to be silenced; the second silencer is spaced apart from the part to be silenced, and the multiple first silencers are all connected to the second silencer.

[0017] According to another aspect of the present invention, a fan assembly is provided, which includes a volute and a silencer. The silencer is the silencer provided above, and a first silencer portion of the silencer is arranged on the volute, and the first silencer portion is arranged toward the noise reduction port of the volute.

[0018] Furthermore, the silencer device is the silencer device provided above, a plurality of first silencers are spaced apart on the side of the volute, and a second silencer portion of the silencer device is spaced apart from the volute.

[0019] According to another aspect of the present invention, a range hood is provided. The range hood includes a fan assembly, and the fan assembly is the fan assembly provided above.

[0020] By applying the technical solution of the present invention, since the first shell has an air inlet, an air outlet, and a first silencer cavity connected to both the air inlet and the air outlet, by arranging the first silencer on the part to be silenced, and arranging the air inlet toward the noise reduction port of the part to be silenced, the noise can be effectively silenced by entering the first silencer cavity from the air inlet, thereby reducing the noise. By arranging the first silencer on the outside of the outer shell of the part to be silenced, the influence of the first silencer on the internal structure of the part to be silenced can be avoided, and the installation of the first silencer can be facilitated. Therefore, the technical solution provided by the present invention can solve the technical problem in the prior art that the noise reduction structure will affect the performance of the fan assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application 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 of the present invention. In the drawings:

[0022] Figure 1 An exploded view of a first muffler provided according to an embodiment of the present invention is shown;

[0023] Figure 2 A schematic structural diagram of a first muffler provided according to an embodiment of the present invention is shown;

[0024] Figure 3 A schematic structural diagram of a first housing provided according to an embodiment of the present invention is shown;

[0025] Figure 4 A cross-sectional view of a first muffler provided according to an embodiment of the present invention is shown;

[0026] Figure 5 A schematic structural diagram of a second muffler provided according to an embodiment of the present invention is shown;

[0027] Figure 6 A schematic structural diagram of a fan assembly according to an embodiment of the present invention is shown;

[0028] Figure 7 A cross-sectional view of a fan assembly provided according to an embodiment of the present invention is shown;

[0029] Figure 8An exploded view of a fan assembly provided according to an embodiment of the present invention is shown;

[0030] Fig. 9 A schematic diagram of the working process of the second muffler provided according to an embodiment of the present invention is shown.

[0031] The above drawings include the following reference numerals:

[0032] 10. First muffler; 11. First housing; 111. Air inlet; 112. Air outlet; 113. First muffler cavity; 12. First fixing seat; 121. Connection hole; 1211. First connection part; 1212. Second connection part; 122. Avoidance hole; 13. Connector; 131. Plug hole; 14. Snap-on; 20. Second muffler; 21. Second housing; 211. Sound transmission channel; 212. Second muffler cavity; 213 , connection port; 22, second fixing seat; 221, heat dissipation port; 222, cooling port; 23, detection component; 24, control component; 25, power cord port; 26, outlet port; 30, volute; 31, rear plate; 32, flange; 33, bracket; 34, enclosure; 35, front plate; 36, motor rubber pad; 37, volute rubber pad; 40, main motor; 50, connecting pipe; 60, fan blade knob; 70, centrifugal fan blade; 80, first sound-absorbing cotton. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] like Figures 1 to 9 As shown, the first embodiment of the present invention provides a silencer device, which includes a first silencer 10, and the first silencer 10 includes a first shell 11, and the first shell 11 has an air inlet 111, an air outlet 112, and a first silencer cavity 113 connected to the air inlet 111 and the air outlet 112, so that the noise entering from the air inlet 111 is reduced in the first silencer cavity 113 and then discharged from the air outlet 112. The first silencer 10 is used to be arranged on the outer shell of the part to be silenced, and specifically, the first silencer 10 is arranged on the side wall of the part to be silenced, and the first silencer 10 is located outside the outer shell of the part to be silenced, and the air inlet 111 is arranged toward the noise reduction port of the part to be silenced.

[0035] By using the silencer device provided in this embodiment, the noise flowing out of the noise reduction port will enter the first silencer chamber 113 through the air inlet 111, and will be discharged from the air outlet 112 after being silenced by the first silencer chamber 113, thereby reducing the noise. In this embodiment, since the first silencer 10 is located outside the outer shell of the silencer to be silenced, the first silencer 10 can be prevented from affecting the internal structure of the silencer, and it is also convenient to install, disassemble and maintain the first silencer 10. Therefore, the silencer device provided in this embodiment can solve the technical problem in the prior art that the noise reduction structure will affect the performance of the fan assembly.

[0036] Specifically, the first housing 11 in this embodiment has a noise reduction hole. The noise reduction hole can be set at the air inlet 111; or, the noise reduction hole can be set at the air outlet 112; or, the noise reduction hole can be set at both the air inlet 111 and the air outlet 112.

[0037] Preferably, in this embodiment, noise reduction holes are provided at both the air inlet 111 and the air outlet 112, and the noise reduction effect can be further improved by the noise reduction holes. Specifically, the air inlet 111 in this embodiment may include a plurality of air inlets, the noise reduction ports are through-hole structures, and the noise reduction ports are located on the side walls of the air inlet 111. The air outlet 112 in this embodiment may include a plurality of air outlets, the noise reduction ports are through-hole structures, and the noise reduction ports are located on the side walls of the air outlet 112. Such a structural arrangement can better improve the noise reduction effect. Specifically, in this embodiment, there are 6 air inlets and 2 air outlets.

[0038] Specifically, the cross-sectional area of ​​the first silencer chamber 113 can be made larger than the air inlet cross-sectional area of ​​the air inlet portion 111; or, the cross-sectional area of ​​the first silencer chamber 113 can be made larger than the air outlet cross-sectional area of ​​the air outlet portion 112; or, the cross-sectional area of ​​the first silencer chamber 113 can be made larger than the air inlet cross-sectional area of ​​the air inlet portion 111, and at the same time, the cross-sectional area of ​​the first silencer chamber 113 can be made larger than the air outlet cross-sectional area of ​​the air outlet portion 112.

[0039] Preferably, the cross-sectional area of ​​the first muffler cavity 113 in this embodiment is larger than the air inlet cross-sectional area of ​​the air inlet portion 111, and at the same time, the cross-sectional area of ​​the first muffler cavity 113 is larger than the air outlet cross-sectional area of ​​the air outlet portion 112. Such a structural arrangement can facilitate better improvement of the noise reduction effect.

[0040] Specifically, the first muffler 10 in this embodiment further includes a first sound-absorbing cotton 80. The first sound-absorbing cotton 80 may be provided at the air inlet 111; or, the first sound-absorbing cotton 80 may be provided in the first muffler cavity 113; or, the first sound-absorbing cotton 80 may be provided at the air inlet 111 and in the first muffler cavity 113. Specifically, the first sound-absorbing surface in this embodiment may be made of a sound-absorbing material.

[0041] Preferably, in this embodiment, first sound-absorbing cotton 80 is provided both at the air inlet part 111 and inside the first sound insulation cavity 113. With such a structural arrangement, the noise reduction effect can be further improved.

[0042] For the convenience of installation, the first sound insulation part 10 in this embodiment further includes a first fixing seat 12. The first housing 11 is arranged on the first fixing seat 12, and the first fixing seat 12 is used for fixing on the outer shell of the component to be sound-insulated. With such an arrangement, it is convenient to install the first housing 11 on the outer shell of the component to be sound-insulated.

[0043] Specifically, a connecting member 13 is provided on the first housing 11 in this embodiment, and a connection hole 121 adapted to the connecting member 13 is provided on the first fixing seat 12. The connecting member 13 is inserted into the connection hole 121 so that the first housing 11 is arranged on the first fixing seat 12. With such a structural arrangement, it is convenient to connect the first fixing seat 12 and the first housing 11 through the connecting member 13, and it is also convenient for operation and installation.

[0044] In this embodiment, the first sound insulation part 10 further includes a clamping member 14, and a plugging hole 131 adapted to the clamping member 14 is provided on the connecting member 13. The connection hole 121 includes a first connection part 1211 and a second connection part 1212 that communicate with each other, so that after the clamping member 14 is inserted into the plugging hole 131, the connecting member 13 is arranged in the first connection part 1211 and the clamping member 14 is clamped in the second connection part 1212. With such a structural arrangement, the connection stability between the first fixing seat 12 and the first housing 11 can be increased, so that the first housing 11 is stably arranged on the first fixing seat 12. Specifically, the first connection part 1211 in this embodiment is a strip-shaped groove structure extending in the horizontal direction, and the second connection part 1212 is a strip-shaped groove structure extending in the vertical direction. The first connection part 1211 and the second connection part 1212 communicate with each other to facilitate connection.

[0045] Specifically, an avoidance hole 122 is further provided on the first fixing seat 12 in this embodiment. The avoidance hole 122 is arranged opposite to the air inlet part 111, and the avoidance hole 122 is used for avoiding the noise reduction port on the component to be sound-insulated. With such a structural arrangement, it is better to facilitate the noise at the noise reduction port to fully enter the air inlet part 111, so that the first sound insulation cavity 113 can fully reduce the noise. Specifically, there are two avoidance holes 122 in this embodiment. The two avoidance holes 122 are respectively located at the upper and lower ends of the second connection part 1212. The two avoidance holes 122 are both communicated with the second connection part 1212. The two avoidance holes 122, the first connection part 1211 and the second connection part 1212 penetrate through to form a "king" - shaped hole structure to optimize the structural layout on the first fixing seat 12.

[0046] Specifically, the silencing device in this embodiment further includes a second silencing portion 20, and the second silencing portion 20 has a second silencing chamber 212. The air outlet portion 112 is connected to the second silencing chamber 212, so that the noise discharged from the air outlet portion 112 is reduced by the second silencing chamber 212. With such a structural arrangement, the air reduced in noise by the first silencing portion 10 will flow into the second silencing chamber 212, so as to continue to reduce noise by the second silencing chamber 212, so as to better improve the noise reduction effect.

[0047] Specifically, the second muffler 20 in this embodiment includes a second shell 21 and a second fixing seat 22, the second shell 21 is arranged on the second fixing seat 22, the second shell 21 has a sound transmission channel 211 and a second muffler chamber 212, the inlet end of the sound transmission channel 211 is used to communicate with the outside air, and the outlet end of the sound transmission channel 211 can be selectively communicated with the second muffler chamber 212, so as to reduce the noise transmitted by the sound transmission channel 211 through the second muffler chamber 212. With such a structural setting, when the external noise exceeds the preset value, the sound transmission channel 211 will be communicated with the second muffler chamber 212, so as to transmit the noise to the second muffler chamber 212 through the sound transmission channel 211, and reduce the noise through the second muffler chamber 212; when the external noise is lower than the preset value, it can be regarded as a situation where the external noise is very small, at this time, it is not necessary to reduce the external noise, and the sound transmission channel 211 and the second muffler chamber 212 are in an isolated state.

[0048] In order to improve the noise reduction effect of the second silencing chamber 212, a second sound-absorbing cotton can be arranged in the second silencing chamber 212. With such a structural setting, it is convenient to perform multi-layer noise reduction on noise, thereby effectively reducing noise. In order to better improve the noise reduction effect, the first silencing chamber 113 and the second silencing chamber 212 can be a sealed structure.

[0049] In this embodiment, the second muffler 20 further includes a detection member 23 and a control member 24. The detection member 23 is arranged on the second fixed seat 22, and the detection end of the detection member 23 is used to sense the noise of the external air. The control member 24 is connected to the detection member 23 so that the control member 24 controls the sound transmission channel 211 to be connected or disconnected with the second muffler chamber 212 according to the noise detected by the detection member 23. With such a structural arrangement, when the detection member 23 detects that the external noise exceeds a preset value, the control member 24 controls the sound transmission channel 211 to be connected with the second muffler chamber 212; when the detection member 23 detects that the external noise is less than a preset value, the control member 24 controls the sound transmission channel 211 to remain disconnected with the second muffler chamber 212. Specifically, an electric valve is arranged between the sound transmission channel 211 and the second muffler chamber 212, and the control member 24 controls the electric valve to move to an open state or a closed state so that the sound transmission channel 211 is connected or disconnected with the second muffler chamber 212.

[0050] Specifically, the detection member 23 in this embodiment can be a sensing rod, which detects the noise by sensing the air vibration at the corresponding position. When the fan is working, the sensing rod can automatically sense the transmission of noise. When the noise sensed by the sensing rod reaches a preset value, the external noise enters the second silencing chamber 212, and the second silencing chamber 212 and the second sound-absorbing cotton in the second silencing chamber 212 further reduce the noise.

[0051] Specifically, in this embodiment, the second housing 21 is further provided with a connection port 213, and the connection pipe 50 is inserted into the connection port 213, so that the connection pipe 50 is connected with the second silencing chamber 212 through the connection port 213. With such a structural arrangement, it is convenient for the air silenced by the first silencing chamber 113 to enter the second silencing chamber 212 through the connection pipe 50 to continue silencing, so as to further improve the noise reduction effect.

[0052] Specifically, in this embodiment, there are multiple first silencers 10, which are arranged at intervals on the housing of the part to be silenced; the second silencer 20 is arranged at intervals with the part to be silenced, and the multiple first silencers 10 are connected to the second silencer 20. With such a structural arrangement, multiple noise reduction can be performed to better improve the noise reduction effect.

[0053] Specifically, the silencer device in this embodiment also includes a connecting pipe 50, and the air outlet 112 of the first silencer 10 is connected to the second silencer 20 through the connecting pipe 50. Since more electrical components are installed on the second fixing seat 22, the second silencer 20 will generate a certain amount of heat when it is working. In order to avoid the over-high temperature affecting the operation of the second silencer 20, a heat dissipation port 221 is provided on the second fixing seat 22, so as to dissipate heat through the heat dissipation port 221, so as to effectively reduce the heat of the second fixing seat 22, so that the second silencer 20 can work normally for a long time. Specifically, due to long-term operation, when the components on the second silencer 20 reach a certain temperature, the heat dissipation port 221 can play a certain role to dissipate the internal temperature to the outside, thereby preventing damage to the internal components. In addition, a cooling port 222 may be provided on the second fixing seat 22 . The cooling port 222 is spaced apart from the heat dissipation port 221 . Some coolant may be poured into the cooling cavity on the second fixing seat 22 through the cooling port 222 , so as to cool down the components on the second fixing seat 22 .

[0054] In this embodiment, the heat dissipation port 221 is located at the outer edge of the second fixing seat 22 to better dissipate heat. Specifically, the second muffler 20 also has a power line port 25 and an outlet port 26. The power line port 25 is used to connect to a power source, and the outlet port 26 is used to connect to the control module of the range hood.

[0055] Embodiment 2 of the present invention provides a fan assembly, which includes a volute 30 and a silencer, the silencer is the silencer provided in Embodiment 1, the first silencer 10 of the silencer is arranged on the volute 30, and the first silencer 10 is arranged toward the noise reduction port of the volute 30. Specifically, a plurality of through openings are arranged on the side wall of the volute 30, and these through openings are noise reduction ports, which can transmit noise and also have a certain noise reduction effect.

[0056] Specifically, the silencer device includes a second silencer 20 and a plurality of first silencers 10, wherein the plurality of first silencers 10 are arranged at intervals on the side of the volute 30, and the second silencer 20 of the silencer device is arranged at intervals from the volute 30. With such a structural arrangement, it is possible to better reduce the noise generated by the fan inside the volute 30, so that the effect of reducing the noise inside the volute 30 can be achieved without arranging the silencer device inside the volute 30.

[0057] Specifically, the volute 30 in this embodiment includes a rear plate 31, a flange 32, a bracket 33, a shroud 34, a front plate 35, a motor rubber pad 36 and a volute rubber pad 37. The fan includes a main motor 40, a fan knob 60 and a centrifugal fan 70. Specifically, the noise generated by the centrifugal fan 70 during the rotation process will be transmitted to the first muffler 10 through the noise reduction port on the volute 30, and after being silenced by the first muffler cavity 113 of the first muffler 10, it will flow into the second muffler cavity 212, thereby effectively reducing the noise at the volute 30.

[0058] Specifically, in this embodiment, there are two first silencers 10, which are respectively installed on the side walls on both sides of the edge of the enclosure 34, and the second silencer 20 is connected to the first silencer 10 through a connecting pipe 50. Its working principle is as follows: when the main motor 40 is in the rotating state of operation, the centrifugal fan blades 70 are rotating, and the noise emitted by the two in the working state passes through the noise reduction hole of the enclosure 34, and then passes through the air inlet 111 in the first silencer 10. The edge of the air inlet 111 is provided with a first sound-absorbing cotton. During the transmission process, the noise will begin to absorb the noise through the first sound-absorbing cotton at the edge of the air inlet 111, thereby slowly reducing the noise and finally transmitting it to the first silencer cavity 113 inside the first silencer 10; a first sound-absorbing cotton 80 is also provided inside the first silencer cavity 113 as a second layer of noise reduction module.

[0059] Specifically, the working principle of the installation of the volute 30 is as follows: first, the top plate and the surrounding plate 34 and the four parts of the flange 32 and the bracket 33 are fixed together by spot welding, and then the motor pad 36 and the main motor 40 are installed on the rear plate 31 and fixed with 4 M5X14 motor screws, and then the centrifugal fan blade 70 is fixed on the rotating bearing of the main motor 40, and the centrifugal fan blade 70 is fixed with the fan knob 60, and finally the first silencer part 10 of the silencer device is installed on both sides of the edge of the volute 30 surrounding plate 34, and the second silencer part 20 is installed on the right side of the volute 30 assembly, and the two are connected with a connecting pipe 50.

[0060] Specifically, the silencer device can also be arranged at the outlet position of the air duct of the volute 30. Alternatively, the first silencer 10 can be arranged on the volute 30 in a liftable manner, so as to better reduce the noise at the volute 30, so as to better improve the noise reduction effect.

[0061] Specifically, the first muffler 10 in this embodiment may be an elliptical structure or a square structure.

[0062] A third embodiment of the present invention provides a range hood, the range hood comprising a fan assembly, and the fan assembly is the fan assembly provided in the second embodiment.

[0063] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects: it can improve the noise reduction effect and avoid affecting the internal structure of the sound absorbing component.

[0064] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0066] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0067] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0068] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A silencing device, characterized in that: include: A first silencer (10), the first silencer (10) comprising a first shell (11), the first shell (11) having an air inlet (111), an air outlet (112), and a first silencer cavity (113) in communication with the air inlet (111) and the air outlet (112), so that noise entering through the air inlet (111) is reduced in noise by the first silencer cavity (113) and then discharged from the air outlet (112); The first silencer (10) is used to be arranged on the outer shell of the part to be silenced, the first silencer (10) is located outside the outer shell of the part to be silenced, and the air inlet (111) is arranged toward the noise reduction port of the part to be silenced; a second silencer (20), the second silencer (20) having a second silencer cavity (212), the air outlet (112) being in communication with the second silencer cavity (212), so as to reduce the noise discharged from the air outlet (112) through the second silencer cavity (212); The second muffler (20) comprises: A second shell (21) and a second fixing seat (22), wherein the second shell (21) is arranged on the second fixing seat (22), and the second shell (21) has a sound transmission channel (211) and a second silencer cavity (212), wherein an inlet end of the sound transmission channel (211) is used to communicate with the air outlet (112), and an outlet end of the sound transmission channel (211) is used to communicate with the second silencer cavity (212), so as to reduce noise transmitted from the sound transmission channel (211) through the second silencer cavity (212).

2. The silencing device according to claim 1, characterized in that: The first shell (11) has a noise reduction hole; The noise reduction hole is arranged at the air inlet portion (111); and / or, The noise reduction hole is arranged at the air outlet portion (112).

3. The silencing device according to claim 1, characterized in that: The cross-sectional area of ​​the first muffler cavity (113) is greater than the air inlet cross-sectional area of ​​the air inlet portion (111); and / or, The cross-sectional area of ​​the first silencing cavity (113) is greater than the air outlet cross-sectional area of ​​the air outlet portion (112).

4. The silencing device according to claim 1, characterized in that: The first sound-absorbing portion (10) further comprises a first sound-absorbing cotton (80); The first sound-absorbing cotton (80) is arranged at the air inlet portion (111); and / or, The first sound-absorbing cotton (80) is arranged in the first sound-absorbing cavity (113).

5. The silencing device according to claim 1, characterized in that: The first muffler (10) further comprises: A first fixing seat (12), the first shell (11) being arranged on the first fixing seat (12), the first fixing seat (12) being used to be fixed on the outer shell of the part to be silenced.

6. The silencing device according to claim 5, characterized in that: The first shell (11) is provided with a connecting piece (13), the first fixing seat (12) is provided with a connecting hole (121) adapted to the connecting piece (13), and the connecting piece (13) is inserted into the connecting hole (121) so that the first shell (11) is arranged on the first fixing seat (12).

7. The silencing device according to claim 6, characterized in that: The first muffler portion (10) further comprises a clamping member (14); the connecting member (13) is provided with a plug-in hole (131) adapted to the clamping member (14); the connecting hole (121) comprises a first connecting portion (1211) and a second connecting portion (1212) which are interpenetrating, so that after the clamping member (14) is inserted into the plug-in hole (131), the connecting member (13) is arranged in the first connecting portion (1211) and the clamping member (14) is clamped in the second connecting portion (1212).

8. The silencing device according to claim 5, characterized in that: The first fixing seat (12) is also provided with an avoidance hole (122), the avoidance hole (122) being arranged opposite to the air inlet portion (111), and the avoidance hole (122) being used to avoid the noise reduction opening on the part to be silenced.

9. The silencing device according to claim 1, characterized in that: The second muffler (20) further comprises: A detection member (23) is arranged on the second fixing seat (22), and a detection end of the detection member (23) is used to sense noise from external air; A control component (24) is connected to the detection component (23) so that the control component (24) controls the connection or disconnection between the sound transmission channel (211) and the second silencer chamber (212) according to the noise situation detected by the detection component (23).

10. The silencing device according to claim 1, characterized in that: There are a plurality of first silencers (10), and the plurality of first silencers (10) are arranged at intervals on the outer shell of the part to be silenced; the second silencer (20) is arranged at intervals from the part to be silenced, and the plurality of first silencers (10) are all connected to the second silencer (20).

11. A fan assembly, characterized in that: The fan assembly comprises a volute (30) and a silencer, wherein the silencer is the silencer according to any one of claims 1 to 10, wherein a first silencer portion (10) of the silencer is arranged on the volute (30), and the first silencer portion (10) is arranged toward a noise reduction port of the volute (30).

12. The fan assembly according to claim 11, characterized in that: The silencer device is the silencer device as claimed in claim 9, wherein a plurality of the first silencers (10) are arranged at intervals on the side of the volute (30), and a second silencer (20) of the silencer device is arranged at intervals from the volute (30).

13. A range hood, characterized in that: The range hood comprises a fan assembly, and the fan assembly is the fan assembly described in claim 11 or 12.

Images