volute noise reduction device, fan and range hood

Abstract

This utility model provides a volute noise reduction device, a fan, and a range hood, relating to the field of kitchen appliance technology. The volute noise reduction device includes a strip-shaped housing with an oil inlet, an oil outlet, and an air outlet on its wall. The strip-shaped housing includes a middle section and two extended sections at both ends, with the cross-sectional area of ​​the extended sections near the middle section being smaller than that of the extended sections away from the middle section. The oil inlet is located in the middle section, and the oil outlet is located in the extended sections away from the middle section, respectively located on opposite side walls of the strip-shaped housing. The air outlet is located on the side wall of the extended section away from the middle section and communicates with the inner cavity of the housing. The strip-shaped housing is installed at the bottom of the volute of the fan, and the oil inlet aligns with the oil outlet at the bottom of the volute. The range hood includes the aforementioned fan. This utility model achieves efficient noise reduction for the range hood fan while also considering oil droplet collection and ease of cleaning, optimizing the overall performance of the range hood and improving the user experience.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a volute noise reduction device, a fan, and a range hood. Background Technology

[0002] As an indispensable appliance in modern kitchens, the performance of range hoods directly affects the user's cooking experience. With the improvement of living standards, users' requirements for range hoods are no longer limited to the basic function of smoke extraction; they also have higher standards for noise control and other aspects of the user experience.

[0003] The fan, as the core exhaust structure of a range hood, includes a volute, a motor, and an impeller. The impeller is located inside the volute and is driven by the motor to rotate at high speed. This creates negative pressure inside the volute, generating suction to expel the fumes. During exhaust, oil droplets are separated from the fumes inside the volute. To handle these oil droplets, drainage holes are usually provided on the bottom wall of the volute. However, when the fan operates at high speed, some high-pressure airflow inside the volute exits at high speed through the drainage holes. This not only generates significant aerodynamic noise but also sprays oil droplets in atomized form onto the entire outer surface of the range hood and surrounding areas, making cleaning and maintenance difficult and negatively impacting the user experience. Utility Model Content

[0004] The purpose of this utility model is to provide a volute noise reduction device, a fan, and a range hood to alleviate the above-mentioned technical problems existing in the prior art.

[0005] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0006] In a first aspect, this utility model provides a volute noise reduction device for use in the fan of a range hood. The volute noise reduction device includes:

[0007] The strip-shaped shell includes a middle section and extension sections connected to both ends of the middle section along its length direction. The cross-sectional area of ​​the extension section near the middle section along the length direction is smaller than the cross-sectional area of ​​the extension section away from the middle section along the length direction. The strip-shaped shell has an internal cavity that connects the middle section and the extension sections.

[0008] The oil inlet and the oil outlet are respectively located on opposite side walls of the strip-shaped shell and are connected to the inner cavity of the shell. The oil inlet is located in the middle section, and the oil outlet is located in the extension section away from the middle section.

[0009] The air outlet is located on the side wall of the extension section away from the middle section and communicates with the inner cavity of the housing.

[0010] The installation method of this utility model embodiment is as follows:

[0011] The strip-shaped housing of the volute noise reduction device provided in this embodiment is fixedly installed on the bottom wall of the volute using screws, clips, or other fasteners, so that the oil inlet hole of the strip-shaped housing is connected to the oil drain hole of the bottom wall of the volute. The fan is installed on the range hood body. During operation, the motor drives the impeller inside the volute to rotate at high speed, creating a negative pressure inside the volute to generate suction and expel the smoke. During the process, oil droplets will be separated from the smoke inside the volute by rotation. These droplets are carried by the high-pressure airflow through the oil drain hole and the oil inlet hole in the middle section of the strip-shaped housing connected to the oil drain hole into the inner cavity of the strip-shaped housing. The high-pressure airflow is dispersed from the middle section of the strip-shaped housing to the extension sections at both ends, and finally discharged from the inner cavity of the housing through the air outlet. The oil droplets are discharged from the inner cavity of the housing with the high-pressure airflow to the oil drain hole.

[0012] The embodiments of this utility model can achieve at least the following beneficial effects:

[0013] (1) In this embodiment, the strip shell includes a middle section and extension sections connected to both ends of the middle section along the length direction. The cross-sectional area of ​​the extension section near the middle section along the length direction is smaller than the cross-sectional area of ​​the extension section away from the middle section along the length direction. This allows the high-pressure airflow to enter the inner cavity of the shell from the oil inlet in the middle section and then disperse to the extension sections at both ends. In the extension sections, the airflow gradually decreases in velocity as it flows from the small cross-sectional area near the middle section to the large cross-sectional area away from the middle section (according to Bernoulli's equation, the flow velocity of gas in a pipe is inversely proportional to its cross-sectional area. When the airflow passes through the area with a smaller cross-sectional area, the flow velocity is faster; while when the airflow enters the area with a larger cross-sectional area, the flow velocity is slower). This process can not only disperse the airflow discharge path and reduce the turbulence and eddy current phenomena generated when the airflow is concentrated and discharged from a single outlet (oil leak hole), but also effectively reduce the pressure fluctuation of the airflow, thereby greatly reducing the noise generated by the airflow impact.

[0014] (2) The inner cavity of the shell not only serves as a channel for airflow, but also functions as a channel for oil return. This design prevents oil droplets from splashing onto the overall outer surface of the range hood when they are atomized and sprayed out from the oil leakage hole with the high-pressure airflow, making it more convenient for users to clean.

[0015] In summary, the volute noise reduction device provided in this embodiment achieves efficient noise reduction for the range hood fan through a reasonable structural design, while also taking into account the oil droplet collection function and ease of cleaning, thus optimizing the overall performance of the range hood and improving the user experience.

[0016] Furthermore, the embodiments of this utility model have the following multiple optional implementation methods:

[0017] In an optional embodiment, the air outlet and the oil inlet are located on the same side wall of the strip-shaped housing.

[0018] In an optional embodiment, the extension segment includes a proximal segment and a distal segment, a first end of the proximal segment being connected to one end of the intermediate segment, a second end of the proximal segment being connected to the first end of the distal segment, and the second end of the distal segment being suspended; wherein:

[0019] Along the length direction, the cross-sectional area of ​​the proximal segment cut perpendicular to the length direction gradually increases from the first end of the proximal segment to the second end of the proximal segment.

[0020] In an optional embodiment, at least one variable diameter muffler is provided in the inner cavity of the housing. The variable diameter muffler has an internal silencing channel that extends from the middle section to the extension section along the length direction. The cross-sectional area of ​​the internal silencing channel gradually increases along the direction perpendicular to the length direction.

[0021] In an optional embodiment, the side wall where the oil inlet is located is the top wall of the strip shell, and the other side wall opposite to the top wall is the bottom wall of the strip shell. Along the height direction of the strip shell, the inner bottom wall of the proximal section is an inclined surface with a gradually decreasing height from the first end of the proximal section to the second end of the proximal section.

[0022] In an optional embodiment, a flow diversion structure is provided in the inner cavity of the housing, which is used to divert the fluid at the oil inlet to the oil outlet.

[0023] In an optional embodiment, the diversion structure includes a protrusion located on the side wall of the middle section opposite to the oil inlet and protruding toward the oil inlet;

[0024] The surface of the protrusion facing the oil inlet is a bidirectional slope that is higher in the middle and lower at both ends along its length.

[0025] In an optional embodiment, the volute noise reduction device further includes an oil-proof rubber sleeve, which is fixed to the outer wall of the strip-shaped housing and connected to the oil inlet hole. The outer diameter of the oil-proof rubber sleeve is not less than the inner diameter of the oil inlet hole, or the oil-proof rubber sleeve is inserted and fixed inside the oil inlet hole.

[0026] And / or, the volute noise reduction device also includes a heating device disposed on the shell wall of the strip shell.

[0027] Specifically, in the present invention, the term "and / or" indicates that the structure before "and / or" and the structure after "and / or" are set simultaneously or selectively; for the effects that can be achieved by each of the optional embodiments of the first aspect, please refer to the detailed description in the specific embodiments section of this specification.

[0028] Secondly, this utility model provides a fan for use in a range hood. The fan includes a volute and a volute noise reduction device provided in any of the optional embodiments of the first aspect. The bottom wall of the volute is provided with an oil leakage hole, and a strip-shaped housing is fixedly installed at the bottom of the volute, with the oil inlet hole connected to the oil leakage hole.

[0029] Thirdly, this utility model provides a range hood, including the fan provided in any of the optional embodiments of the second aspect mentioned above.

[0030] Since both the fan provided in the second aspect and the range hood provided in the third aspect of this utility model include the volute noise reduction device provided in the first aspect, for more specific structures and corresponding functional effects of the fan and range hood provided in this embodiment, please refer to the optional or preferred embodiments in the first aspect. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the existing technology in which the fan of a range hood has an oil leakage hole at the bottom of the volute;

[0033] Figure 2 Axonometric view of the mounting structure of the volute noise reduction device provided in this embodiment of the utility model, installed at the bottom of the fan volute;

[0034] Figure 3 A bottom view of the mounting structure of the volute noise reduction device provided in this embodiment of the utility model, installed at the bottom of the fan volute;

[0035] Figure 4 A cantilevered schematic diagram of the overall structure of the volute noise reduction device provided in this embodiment of the utility model from one perspective;

[0036] Figure 5 A top view of the overall structure of the volute noise reduction device provided in this embodiment of the utility model;

[0037] Figure 6 A front sectional view of the overall structure of the volute noise reduction device provided in this embodiment of the utility model;

[0038] Figure 7 A partial isometric sectional view of the volute noise reduction device provided in this embodiment of the present invention from another perspective;

[0039] Figure 8 for Figure 7 Enlarged view of the local structure of region A in the middle;

[0040] Figure 9 for Figure 7 Enlarged view of the local structure of region B in the middle;

[0041] Figure 10 for Figure 7 Enlarged view of the local structure of region C in the middle.

[0042] Icons: 100 - volute; 110 - oil leak hole;

[0043] 200 - Volute noise reduction device; 1 - Strip-shaped housing; X - Length direction; Z - Height direction; 101 - Top wall; 102 - Bottom wall; 11 - Middle section; 1101 - Oil inlet; 12 - Extension section; 121 - Proximal section; 122 - Distal section; 1201 - Oil drain hole; 1202 - Air outlet;

[0044] 2- Variable diameter muffler;

[0045] 3-Flow splitting structure; 31-Protrusion; 311-Bidirectional slope;

[0046] 4-Oil-proof rubber sleeve;

[0047] 5-Heating device;

[0048] 6-Fixed connectors. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0051] It should be noted that similar labels and letters in the accompanying drawings indicate similar items. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings.

[0052] In the description of this utility model, it should be noted that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0053] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0054] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0055] The fan, as the core smoke extraction structure of a range hood, includes a volute, a motor, and an impeller. The impeller is located inside the volute and is driven by the motor to rotate at high speed. This creates negative pressure inside the volute, generating suction to expel the smoke. (Refer to...) Figure 1 During the exhaust process, oil droplets will be separated from the flue gas inside the volute 100. In order to deal with these oil droplets, an oil leakage hole 110 is usually provided on the bottom wall of the volute 100.

[0056] However, when the fan is running at high speed, the high-pressure airflow inside the volute 100 will be released at high speed from the oil leakage hole 110. This will not only generate a large aerodynamic noise, but will also spray oil droplets in the form of atomization onto the entire outer surface of the range hood and surrounding areas, making cleaning and maintenance difficult and affecting the user experience.

[0057] To address the above problems, this embodiment provides a volute noise reduction device, a fan, and a range hood. Specifically:

[0058] First aspect

[0059] This embodiment provides a volute noise reduction device, referring to... Figures 4 to 10The volute noise reduction device 200 includes a strip-shaped housing 1, on which an oil inlet 1101, an oil outlet 1201, and an air outlet 1202 are provided. Specifically, the strip-shaped housing 1 has a length direction X, and along its length direction X, it specifically includes a middle section 11 and extension sections 12 respectively connected to both ends of the middle section 11. Furthermore, the cross-sectional area of ​​the extension section 12 near the middle section 11 along the length direction X is smaller than the cross-sectional area of ​​the extension section 12 away from the middle section 11 along the length direction X. The strip-shaped housing 1 has an internal cavity that connects the middle section 11 and the extension sections 12. Oil inlet 1101 and oil outlet 1201 are respectively provided on opposite side walls of the strip-shaped housing 1 and are connected to the inner cavity of the housing. Oil inlet 1101 is located in the middle section 11 and oil outlet 1201 is located in the extension section 12 away from the middle section 11. Air outlet 1202 is provided on the side wall of the extension section 12 away from the middle section 11 and is connected to the inner cavity of the housing.

[0060] The installation method in this embodiment is as follows:

[0061] Reference Figures 1 to 3 The strip-shaped housing 1 of the volute noise reduction device 200 provided in this embodiment is fixedly installed on the bottom wall of the volute 100 by screws, clips, or other fixing connectors 6, so that the oil receiving hole 1101 provided on the strip-shaped housing 1 is connected to the oil leakage hole 110 provided on the bottom wall of the volute 100. The fan is installed on the range hood body. During operation, the motor drives the impeller inside the volute to rotate at high speed, forming a negative pressure inside the volute to generate suction and discharge the smoke. During the process, oil droplets will be separated from the smoke inside the volute 100 by rotation. With the high-pressure airflow, they enter the inner cavity of the strip-shaped housing through the oil leakage hole 110 and the oil receiving hole 1101 provided in the middle section 11 of the strip-shaped housing 1 connected to the oil leakage hole 110. The high-pressure airflow disperses from the middle section 11 of the strip-shaped housing 1 to the extension sections 12 at both ends, and finally exits the inner cavity of the housing from the air outlet 1202. The oil droplets flow with the high-pressure airflow to the oil discharge hole 1201 and are discharged.

[0062] This embodiment can achieve at least the following beneficial effects:

[0063] (1) In this embodiment, the strip-shaped shell 1 includes a middle section 11 and an extension section 12 connecting the two ends of the middle section 11 along the length direction X, and, as Figure 5 and Figure 7As shown, the cross-sectional area of ​​the extension section 12 near the middle section 11 along the perpendicular length direction X is smaller than the cross-sectional area of ​​the extension section 12 away from the middle section 11 along the perpendicular length direction X. This causes the high-pressure airflow to disperse towards the extension sections 12 at both ends after entering the inner cavity of the shell through the oil inlet 1101 in the middle section 11. In the extension section 12, as the airflow moves from the small cross-sectional area near the middle section 11 to the large cross-sectional area away from the middle section 11, the flow velocity gradually decreases (according to Bernoulli's equation, the flow velocity of gas in a pipe is inversely proportional to its cross-sectional area; the flow velocity is faster when the airflow passes through a smaller cross-sectional area, and slower when the airflow enters a larger cross-sectional area). This process not only disperses the airflow discharge path and reduces the turbulence and eddies generated when the airflow is concentrated and discharged from a single outlet (oil outlet 110), but also effectively reduces the pressure fluctuation of the airflow, thereby significantly reducing the noise generated by the airflow impact.

[0064] (2) The inner cavity of the shell not only serves as a channel for airflow, but also functions as a channel for oil return. This design prevents oil droplets from splashing onto the outer surface of the range hood when they are atomized and sprayed out from the oil leakage hole 110 with the high-pressure airflow, making it more convenient for users to clean.

[0065] In summary, the volute noise reduction device provided in this embodiment achieves efficient noise reduction for the range hood fan through a reasonable structural design, while also taking into account the oil droplet collection function and ease of cleaning, thus optimizing the overall performance of the range hood and improving the user experience.

[0066] In this embodiment, the middle section 11 and the extension section 12 of the strip shell 1 can be an integrally formed structure or a segmented shell manufactured by joining. When the middle section 11 and the extension section 12 are segmented shells, the connection method between the two can be selected, but is not limited to, welding or snap-fit ​​structure combined with sealing parts or sealant to seal the joint, or other optional connection methods. Preferably, the middle section 11 and the extension section 12 are integrally formed structures to avoid the problem of the joint damaging the sealing performance of the shell cavity when the two are separate structures.

[0067] In this embodiment, the air outlet 1202 can be located on either side of the shell wall of the strip-shaped shell 1. Preferably, referring to... Figure 4 In some optional embodiments of this example, the air outlet 1202 and the oil collection hole 1101 are located on the same side wall of the strip-shaped housing 1. That is, the air outlet 1202 and the oil collection hole 1101 are both located on the top wall 101 of the strip-shaped housing 1. When the airflow reaches the air outlet 1202, the oil droplets fall back into the inner cavity of the housing under the action of gravity, so that the oil droplets are discharged only from the oil drain hole 1201, which is more conducive to cleaning. At the same time, the air outlet 1202 does not face the user, resulting in a better user experience.

[0068] Furthermore, in this embodiment, the cross-sectional area of ​​the extension segment 12 near the middle segment 11 along the perpendicular length direction X is smaller than the cross-sectional area of ​​the extension segment 12 away from the middle segment 11 along the perpendicular length direction X. This does not mean that the cross-sectional area of ​​the extension segment 12 along the length direction X must change linearly. The extension segment 12 can change linearly, or the cross-sectional area can be equal at all points in a certain segment. For example, refer to... Figures 4 to 6 In an optional embodiment of this example, the extension segment 12 includes a proximal segment 121 and a distal segment 122. The first end of the proximal segment 121 is connected to one end of the intermediate segment 11, and the second end of the proximal segment 121 is connected to the first end of the distal segment 122. The second end of the distal segment 122 is suspended. Along the length direction X, the cross-sectional area of ​​the proximal segment 121 cut perpendicular to the length direction X gradually increases from the first end of the proximal segment 121 to the second end of the proximal segment 121.

[0069] Reference Figures 6 to 8 In an optional embodiment, at least one variable-diameter muffler 2 is provided in the inner cavity of the housing. This variable-diameter muffler 2 has an internal silencing channel extending from the middle section 11 to the extension section 12 along the length X of the strip-shaped housing 1. The cross-sectional area of ​​the internal silencing channel of the variable-diameter muffler 2 gradually increases along the section perpendicular to the length X. That is, when the high-pressure airflow enters the inner cavity of the housing from the oil inlet 1101 provided in the middle section 11 and disperses to the extension sections 12 at both ends, it also flows through the internal silencing channel of the variable-diameter muffler 2. During this process, as the airflow flows from the small cross-sectional area to the large cross-sectional area of ​​the internal silencing channel of the variable-diameter muffler 2, the flow velocity gradually decreases, further reducing the pressure fluctuation of the airflow and further reducing the noise generated by the airflow impact. In this optional embodiment, the variable-diameter muffler 2 combined with the strip-shaped housing 1 with a variable diameter along the length X forms a multi-stage noise reduction structure, and the noise reduction capability is significantly enhanced. The variable-diameter muffler 2 can be provided in any section of the housing, optionally but not limited to, such as Figures 6 to 8 As shown, it is installed inside the distal section 122; when two or more variable diameter mufflers 2 are provided, these variable diameter mufflers 2 are connected in series along the length direction X of the strip shell 1.

[0070] To enhance oil return efficiency and improve oil return effect, refer to Figure 4 and Figure 6In an optional embodiment of this example, the side wall where the oil inlet 1101 is located is the top wall 101 of the strip-shaped shell 1, and the other side wall opposite to the top wall 101 is the bottom wall 102 of the strip-shaped shell 1. Along the height direction Z of the strip-shaped shell 1, the inner bottom wall 102 of the proximal section 121 is an inclined surface whose height gradually decreases from the first end of the proximal section 121 to the second end of the proximal section 121. In this optional embodiment, by designing the inner bottom wall 102 of the proximal section 121 as an inclined surface, oil droplets can flow more smoothly from the proximal section 121 to the distal section 122 under the action of gravity, and the oil droplets are easier to discharge, reducing the retention of oil droplets in the proximal section 121. This not only helps to improve the transmission speed of oil droplets, but also reduces the deposition problems that may be caused by oil droplet retention.

[0071] In addition, in an optional embodiment of this example, refer to Figure 6 , Figure 7 and Figure 9 The housing cavity is provided with a flow-diverting structure 3, which is used to divert fluid from the oil inlet 1101 to the oil outlet 1201. In this optional embodiment, when fluid enters the housing from the oil inlet 1101, the flow-diverting structure 3 can effectively guide and distribute the fluid to the direction of the oil outlet 1201, ensuring that the fluid flows along a predetermined path. This design helps to optimize the flow path of the fluid in the housing, reduce unnecessary stagnation or eddies in the fluid within the housing, and thus improve fluid transfer efficiency.

[0072] Furthermore, by rationally designing the shape and position of the flow divider structure 3, precise control of fluid flow rate and pressure distribution can be achieved, further improving the overall performance and stability of the device. For example, continuing to refer to... Figure 6 , Figure 7 and Figure 9In an optional embodiment of this example, the diversion structure 3 includes a protrusion 31 located on the side wall of the intermediate section 11 opposite to the oil inlet 1101 and protruding toward the oil inlet 1101. The surface of the protrusion 31 facing the oil inlet 1101 is a bidirectional inclined surface 311 with a higher middle section and lower ends along the length direction X. It should be noted that the protrusion 31 may be an additional structure protruding from the bottom wall of the intermediate section 11 on the inner side wall (equivalent to the wall thickness of the intermediate section 11 at the location of the protrusion 31 being greater than the wall thickness of other parts of the bottom wall of the intermediate section 11), or it may be a structure that is recessed upward from the bottom wall of the intermediate section 11, thus protruding on one side inside the intermediate section 11 and forming a recess on the outer side of the intermediate section 11. This embodiment does not impose specific limitations on this. In this optional embodiment, the bidirectional inclined surface 311 of the protrusion 31 can effectively guide the oil droplets from the oil receiving hole 1101 into the inner cavity of the housing, and then quickly disperse them towards the oil drain hole 1201 along the inclined surface, reducing the resistance of the oil droplets in the inner cavity of the housing and reducing the unnecessary residence time of the oil droplets in the inner cavity of the housing, thereby improving the oil return efficiency.

[0073] In an optional implementation of this embodiment, reference is made to Figures 4 to 6 The volute noise reduction device 200 provided in this embodiment also includes an oil-proof rubber sleeve 4. The oil-proof rubber sleeve 4 is bonded, fused, or fixed to the outer wall of the strip-shaped housing 1 by screws or other connecting parts and is aligned with the oil inlet 1101. The outer diameter of the oil-proof rubber sleeve 4 is not less than the inner diameter of the oil inlet 1101. Alternatively, the oil-proof rubber sleeve 4 can be inserted and fixed inside the oil inlet 1101. In this optional embodiment, by providing the oil-proof rubber sleeve 4, oil droplets can be prevented from overflowing from the connection between the oil inlet 1101 and the oil leakage hole 110 on the bottom wall of the volute 100. At the same time, it also serves as a buffer component to prevent resonance noise between the volute 100 and the strip-shaped housing 1, further ensuring the noise reduction effect.

[0074] Additionally, if oil droplets condense inside the shell cavity of the strip-shaped shell 1, oil stains will accumulate on the inner wall of the shell. For this, refer to... Figure 6 In an optional embodiment of this invention, the volute noise reduction device 200 further includes a heating device 5 disposed on the shell wall of the strip-shaped shell 1. This heating device 5 has various specific optional structural forms, including but not limited to PTC ceramic heating elements, metal heating tubes, and electric blower assemblies, and can be electrically connected to the range hood's controller via wires for related control. The heating device 5 can be disposed on the inner wall or the outer wall of the strip-shaped shell 1, and is used to directly heat or conduct heat through the shell wall to heat the air temperature inside the shell cavity, keeping the oil droplets in a liquid state to prevent them from condensing inside the shell cavity and being unable to drain.

[0075] Second aspect

[0076] This embodiment also provides a fan for use in a range hood, specifically including a volute 100 and a volute noise reduction device 200 provided in any optional embodiment of the first aspect. An oil drain hole 110 is provided on the bottom wall of the volute 100. The strip-shaped housing 1 of the volute noise reduction device 200 is fixedly installed on the bottom wall of the volute 100 by screws, clips, or other fixing connectors 6, and its oil inlet 1101 is connected to the oil drain hole 110 provided on the bottom wall of the volute 100. The specific connection method includes, but is not limited to, snap-fit, or the oil inlet 1101 and the oil drain hole 110 are respectively provided with threaded pipes and connected by threaded pipes, or by using an additional oil-proof rubber sleeve 4 as a connector to be interference-fitted with the oil inlet 1101 and the oil drain hole 110 respectively.

[0077] Third aspect

[0078] This embodiment also provides a range hood, which includes the fan provided in the second aspect.

[0079] Since both the fan provided in the second aspect and the range hood provided in the third aspect of this embodiment include the volute noise reduction device 200 provided in the first aspect, the more specific structures and corresponding functional effects of the fan and range hood provided in this embodiment can be obtained by referring to the optional or preferred embodiments in the first aspect.

[0080] Finally, it should be noted that:

[0081] 1. In this specification, "and / or" means that the structure before "and / or" and the structure after "and / or" are set simultaneously or selectively;

[0082] 2. The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. The above embodiments in this specification are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A volute noise reduction device applied to a fan of a range hood, characterized in that: The volute noise reduction device (200) includes: A strip-shaped shell (1) includes a middle section (11) and extension sections (12) connected to both ends of the middle section (11) along its length direction (X). The cross-sectional area of ​​the extension section (12) near the middle section (11) along the length direction (X) is smaller than the cross-sectional area of ​​the extension section (12) away from the middle section (11) along the length direction (X). The strip-shaped shell (1) has an internal cavity that connects the middle section (11) and the extension sections (12). Oil inlet (1101) and oil outlet (1201) are respectively provided on the opposite side walls of the strip shell (1) and are connected to the inner cavity of the shell. The oil inlet (1101) is located in the middle section (11) and the oil outlet (1201) is located in the extension section (12) away from the middle section (11). An air outlet (1202) is located on the side wall of the extension section (12) away from the middle section (11) and communicates with the inner cavity of the housing.

2. The volute noise reduction device of claim 1, wherein: The air outlet (1202) and the oil inlet (1101) are located on the same side wall of the strip-shaped housing (1).

3. The volute noise reduction device of claim 1, wherein: The extension segment (12) includes a proximal segment (121) and a distal segment (122). The first end of the proximal segment (121) is connected to one end of the intermediate segment (11), and the second end of the proximal segment (121) is connected to the first end of the distal segment (122). The second end of the distal segment (122) is suspended. Along the length direction (X), the cross-sectional area of ​​the proximal segment (121) cut perpendicular to the length direction (X) gradually increases from the first end of the proximal segment (121) to the second end of the proximal segment (121).

4. The volute noise reduction device of claim 1, wherein: At least one variable diameter muffler (2) is provided in the inner cavity of the housing. The variable diameter muffler (2) has an internal silencing channel that extends from the middle section (11) to the extension section (12) along the length direction (X). The cross-sectional area of ​​the internal silencing channel gradually increases along the section perpendicular to the length direction (X).

5. The volute noise reduction device according to claim 3, characterized in that: Taking the side wall where the oil inlet (1101) is located as the top wall (101) of the strip shell (1), and the other side wall opposite to the top wall (101) as the bottom wall (102) of the strip shell (1), along the height direction (Z) of the strip shell (1), the inner bottom wall (102) of the proximal section (121) is an inclined surface whose height gradually decreases from the first end of the proximal section (121) to the second end of the proximal section (121).

6. The volute noise reduction device of claim 1, wherein: The inner cavity of the housing is provided with a flow diversion structure (3), which is used to divert the fluid at the oil inlet (1101) to the oil outlet (1201).

7. The volute noise reduction device of claim 6, wherein: The diversion structure (3) includes a protrusion (31) located on the side wall of the middle section (11) opposite to the oil inlet (1101) and protruding toward the oil inlet (1101). The surface of the protrusion (31) facing the oil inlet (1101) is a bidirectional slope (311) that is high in the middle and low at both ends along the length direction (X).

8. The volute noise reduction device of claim 1, wherein: The volute noise reduction device (200) further includes an oil-proof rubber sleeve (4), which is fixed to the outer wall of the strip-shaped housing (1) and connected to the oil inlet (1101). The outer diameter of the oil-proof rubber sleeve (4) is not less than the inner diameter of the oil inlet (1101), or the oil-proof rubber sleeve (4) is inserted and fixed inside the oil inlet (1101). And / or, the volute noise reduction device further includes a heating device (5) disposed on the shell wall of the strip shell (1).

9. A fan for use in a range hood, the fan comprising: The fan includes a volute (100) and a volute noise reduction device (200) according to any one of claims 1-8, characterized in that: the bottom wall of the volute (100) is provided with an oil leakage hole (110), the strip-shaped housing (1) is fixedly installed on the bottom wall of the volute (100), and the oil inlet (1101) is connected to the oil leakage hole (110).

10. A range hood characterized by: Includes the fan as described in claim 9.

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