Range hood

Abstract

The application provides a range hood, which comprises a box, a frame, at least one connecting piece, the box forms a flow guide cavity and a first air outlet communicated with the flow guide cavity; the frame forms an air duct cavity with a fan arranged therein, the air duct cavity is communicated with the flow guide cavity; the connecting piece is connected with the box and the frame, the connecting piece forms an expansion cavity, the expansion cavity is communicated with the flow guide cavity and the air duct cavity respectively. The application can effectively increase the cross-sectional area of the airflow passage at the connecting position of the box and the frame, so as to reduce the airflow velocity and reduce the noise.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to a range hood. Background Technology

[0002] With the continuous development of science and technology, range hoods have become one of the most common kitchen appliances in people's daily lives. In the current technology, in order to meet the requirements of a slim and lightweight appearance, the thickness of the range hood casing is usually relatively thin. This results in a smaller cross-sectional area at the connection between the casing and the frame. When the airflow passes through this connection, the airflow velocity increases, which generates more noise. Summary of the Invention

[0003] This application provides a range hood that can effectively increase the cross-sectional area of ​​the airflow channel at the connection between the housing and the frame, thereby reducing the airflow velocity and noise generation.

[0004] To solve the above-mentioned technical problems, this application provides a range hood, which includes a housing, a frame, and at least one connector. The housing forms a flow guiding cavity and a first air outlet communicating with the flow guiding cavity. The frame forms an air duct cavity with a fan inside, and the air duct cavity is communicating with the flow guiding cavity. The connector is connected to the housing and the frame, and the connector forms an expansion cavity, which is communicating with the flow guiding cavity and the air duct cavity respectively.

[0005] The beneficial effects of this application are as follows: The range hood of this application includes a housing, a frame, and at least one connector. The housing forms a guide cavity and a first air outlet communicating with the guide cavity. The frame forms an air duct cavity containing a fan, and the air duct cavity communicates with the guide cavity. The connector connects to the housing and the frame, and the connector forms an expansion cavity, which communicates with both the guide cavity and the air duct cavity. In this way, the connector can be used to connect the housing and the frame, improving the structural stability of the range hood; the expansion cavity formed by the connector can effectively increase the cross-sectional area of ​​the airflow channel at the connection between the housing and the frame, thereby reducing the airflow velocity and noise generation. Attached Figure Description

[0006] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0007] Figure 1 This is a schematic diagram of the structure of an embodiment of the range hood of this application;

[0008] Figure 2 yes Figure 1 Exploded structural diagram of the embodiment;

[0009] Figure 3 yes Figure 1 A cross-sectional structural diagram of the embodiment;

[0010] Figure 4 This is a cross-sectional structural diagram of a portion of the range hood structure in this application;

[0011] Figure 5 This is a structural schematic diagram of the housing and connecting parts of the range hood of this application;

[0012] Figure 6 This is a schematic diagram of the structure of one embodiment of the connector of this application;

[0013] Figure 7 yes Figure 6 Side view of the embodiment;

[0014] Figure 8 This is a schematic diagram of another embodiment of the connector in this application;

[0015] Figure 9 This is a structural schematic diagram of another embodiment of the connector in this application. Detailed Implementation

[0016] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0017] The terms “first,” “second,” etc., used in this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that, when used in this specification and the appended claims, the term “comprising” indicates the presence of the described feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term “and / or,” as used in this specification and the appended claims, refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0018] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [the described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [the described condition or event] is detected," or "in response to detection of [the described condition or event]."

[0019] It should be noted that when one element is fixed to another element, this includes fixing the element directly to the other element or fixing the element to the other element through at least one other intermediate element. When one element is connected to another element, this includes connecting the element directly to the other element or connecting the element to the other element through at least one other intermediate element.

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] With the continuous development of science and technology, range hoods have become one of the most common kitchen appliances in people's daily lives. In the current technology, in order to meet the requirements of a slim and lightweight appearance, the thickness of the range hood casing is usually relatively thin. This results in a smaller cross-sectional area at the connection between the casing and the frame. When the airflow passes through this connection, the airflow velocity increases, which generates more noise.

[0022] Typically, after a range hood is installed, the front end of the hood housing is the end closest to the user, and the rear end is positioned opposite the front end. The frame is located on top of the housing. It should be noted that, in this application, the front end or front side of a component or assembly refers to the end or side of that component or assembly closest to the user; the rear end or rear side of a component or assembly refers to the end or side of that component or assembly away from the user and opposite to the aforementioned front end or front side. For example, the rear side of the range hood housing is usually located close to the wall mounting surface. This application uses the state of the range hood after installation as an example for description.

[0023] This application first proposes a range hood, such as Figures 1 to 9As shown. The range hood includes a housing 10, a frame 20, and at least one connector 30. The housing 10 forms a guide cavity 110 and a first air outlet 120 communicating with the guide cavity 110. The frame 20 forms an air duct cavity 210 with a fan 40 inside, and the air duct cavity 210 is communicating with the guide cavity 110. The connector 30 is connected to the housing 10 and the frame 20, and the connector 30 forms an expansion cavity 310, which is communicating with both the guide cavity 110 and the air duct cavity 210.

[0024] See Figure 3 , Figure 4 , Figure 3 , Figure 4 The diagram illustrates the airflow path of the range hood during operation. The cooking fumes enter the guide chamber 110 from the air inlet, exit the guide chamber 110 through the first air outlet 120, enter the duct chamber 210, and then flow into the fan 40. For example, in one application scenario, a portion of the airflow flows directly into the duct chamber 210 through the first air outlet 120, while another portion flows into the expansion chamber 310 through the first air outlet 120 and then into the duct chamber 210.

[0025] The range hood includes at least one connector 30, which can be used to connect the housing 10 and the frame 20 to improve the structural stability of the range hood; the connector 30 forms an expansion cavity 310, which can effectively increase the cross-sectional area of ​​the airflow channel at the connection between the housing 10 and the frame 20, thereby reducing the airflow velocity and reducing noise generation.

[0026] In some embodiments, see Figure 4 In a plane perpendicular to the arrangement direction y of the housing 10 and the frame 20, the cross-sectional area of ​​the first air outlet 120 of the guide cavity 110 is larger than the cross-sectional area of ​​the air inlet of the air duct cavity 210. Along the arrangement direction y of the housing 10 and the frame 20, the cross-sectional area of ​​the expansion cavity 310 decreases from the housing 10 toward the frame 20.

[0027] Airflow moves from the guide cavity 110 to the duct cavity 210 along the arrangement direction y of the housing 10 and the frame 20. In a plane perpendicular to the arrangement direction y of the housing 10 and the frame 20, the cross-sectional area of ​​the first air outlet 120 of the guide cavity 110 is larger than the cross-sectional area of ​​the air inlet of the duct cavity 210. Therefore, to prevent a sudden drop in the cross-sectional area of ​​the flow channel when the airflow moves from the guide cavity 110 to the duct cavity 210, the cross-sectional area of ​​the expansion cavity 310 is reduced from the housing 10 toward the frame. This achieves airflow expansion while also allowing for a gradual change in the cross-sectional area of ​​the flow channel at the connection point, thus reducing noise.

[0028] In some embodiments, the frame 20 is disposed above the housing 10; the bottom of the frame 20 is provided with a first air inlet 220 communicating with the air duct cavity 210 and the first air outlet 120, and the side wall of the frame 20 is provided with a second air inlet 230 communicating with the air duct cavity 210 and the expansion cavity 310; the connector 30 is provided with a third air inlet 320 and a second air outlet 330, the third air inlet 320 communicating with the first air outlet 120 and the expansion cavity 310, and the second air outlet 330 communicating with the expansion cavity 310 and the second air inlet 230.

[0029] Specifically, see Figure 2 , Figure 4 , Figure 5 When the airflow flows from the guide cavity 110 into the air duct cavity 210, part of the airflow from the first air outlet 120 directly enters the air duct cavity 210 through the first air inlet 220, while the other part first enters the expansion cavity 310 through the third air inlet 320, then flows into the second air inlet 230 through the second air outlet 330, and finally enters the air duct cavity 210. This design effectively disperses the airflow, expands the airflow channel at the connection between the housing 10 and the frame 20, reduces the flow velocity, and reduces noise. Furthermore, placing the second air inlet 230 on the side wall of the frame 20 helps optimize the overall size of the machine and improve space utilization.

[0030] In some embodiments, see Figure 2 , Figure 4 , Figure 5 The first air outlet 120 includes a first air outlet area 1201 and at least one second air outlet area 1202 arranged along the first direction x. The first air outlet area 1201 is connected to the first air inlet 220. The second air outlet area 1202 is connected to the third air inlet 320. The first ratio of the size of the second air outlet area 1202 along the first direction x to the size of the first air outlet area 1201 along the first direction x is ≥0.15. The first direction x is perpendicular to the arrangement direction y of the housing 10 and the frame 20.

[0031] Specifically, when the airflow flows from the guide cavity 110 into the air duct cavity 210, it enters the first air inlet 220 through the first air outlet 1201 to enter the air duct cavity 210; and the airflow enters the third air inlet 320 through the second air outlet 1202, thereby entering the expansion cavity 310, and flows into the second air inlet 230 of the frame 20 through the second air outlet 330 on the connector 30 to enter the air duct cavity 210. The first air inlet 220 at the bottom of the frame 20 is connected to the first air outlet 1201, that is, the first air inlet 220 can directly connect the guide cavity 110 and the air duct cavity 210.

[0032] It should be noted that the dimensions of the first air inlet 220 are matched and set to match the dimensions of the first air outlet 1201; the dimensions of the third air inlet 320 are matched and set to match the dimensions of the second air outlet 1202; and the dimensions of the second air outlet 330 of the connector 30 are matched and set to match the dimensions of the second air inlet 230 of the frame 20.

[0033] The above configuration can further improve the expansion effect and reduce noise. Specifically, the first air outlet 1201 of the first air outlet 120 is connected to the first air inlet 220, and the second air outlet 1202 of the first air outlet 120 is connected to the third air inlet 320 of the connector 30. The first ratio of the dimension of the second air outlet 1202 along the first direction x to the dimension of the first air outlet 1201 is greater than or equal to 0.15, which can ensure that the airflow flowing into the expansion cavity 310 through the second air outlet 1202 has a sufficiently large flow channel space, thus effectively reducing noise.

[0034] In some embodiments, the first ratio is 0.15, 0.2, 0.25, 0.3, 0.4, or 0.5, etc., and is not specifically limited. By adjusting the first ratio, the airflow distribution can be flexibly optimized according to actual needs, further improving the noise reduction effect.

[0035] In some embodiments, the first direction x is perpendicular to the second direction z, and the second direction z is the direction from the front end of the housing 10 toward the rear end of the housing 10.

[0036] The above settings help reduce the impact on the thickness of the housing 10. Specifically, the size of the housing 10 in the second direction z determines the thickness of the housing 10. The first air outlet zone 1201 and the second air outlet zone 1202 are arranged along the first direction x. By adjusting the size of the second air outlet zone 1202 along the first direction x to increase the flow channel space, a larger flow channel area can be achieved without affecting the thickness of the housing 10, thus reducing the impact on the thickness of the housing 10.

[0037] In some embodiments, see Figure 2 , Figure 6 , Figure 7 The dimension h of the second air outlet 330 along the arrangement direction y of the housing 10 and the frame 20 is ≥50mm.

[0038] The dimensions of the second air outlet 330 are matched and identical to those of the second air inlet 230 of the frame 20. In the arrangement direction y of the housing 10 and the frame 20, the extension dimension h of the second air outlet 330 is greater than 50mm, which can effectively increase the flow space of airflow from the expansion cavity 310 into the air duct cavity 210 and reduce noise.

[0039] In some embodiments, a second air inlet 230 is provided on the side wall of the frame 20, and the extending direction of the side wall is parallel to the above-mentioned arrangement direction y.

[0040] In some embodiments, the dimension h of the second air outlet 330 along the arrangement direction y is 50mm, 55mm, 60mm, 63mm, 65mm or 70mm, which can ensure sufficient flow channel space.

[0041] In some embodiments, see Figure 4 , Figure 5 The first air outlet 120 includes a first air outlet area 1201 and at least one second air outlet area 1202 arranged along the first direction x. The first air outlet area 1201 is connected to the first air inlet 220. The second air outlet area 1202 is connected to the third air inlet 320. The second ratio of the projected area of ​​the second air outlet area 1202 in a plane perpendicular to the arrangement direction y of the housing 10 and the frame 20 to the projected area of ​​the first air outlet area 1201 in a plane perpendicular to the arrangement direction y is ≥0.15. The first direction x is perpendicular to the arrangement direction y.

[0042] The aforementioned arrangement direction y refers to the arrangement direction y of the housing 10 and the frame 20.

[0043] The above-mentioned arrangement can further increase the cross-sectional area of ​​the airflow channel at the connection between the housing 10 and the frame 20, thereby reducing noise. The second ratio of the projected area of ​​the second air outlet zone 1202 in a plane perpendicular to the arrangement direction y to the projected area of ​​the first air outlet zone 1201 in a plane perpendicular to the arrangement direction y is ≥0.15, for example, the second ratio is 0.2, 0.25, 0.3, 0.5, 0.6, etc., which can ensure that the airflow channel provided by the second air outlet zone 1202 is wider, further improving the noise reduction effect.

[0044] In other embodiments, similar improvements can be made to the first ratio, the size of the second air outlet, and the second ratio, which will not be elaborated here.

[0045] In some embodiments, the first air outlet 120 is disposed on the top wall of the housing 10, the extension direction of the top wall of the housing 10 is parallel to the extension direction of the bottom wall of the frame 20, and is perpendicular to the arrangement direction y of the housing 10 and the frame 20. This method can optimize the overall structure.

[0046] In some embodiments, see Figure 2 , Figure 4 The first air inlet 220 and the second air inlet 230 are connected without a wall to form the air inlet of the air duct cavity 210; the third air inlet 320 and the second air outlet 330 are disposed on the adjacent side walls of the connector 30, and there is no wall connection between the third air inlet 320 and the second air outlet 330.

[0047] The above-mentioned arrangement reduces airflow resistance as airflow moves from the guide cavity 110 to the duct cavity 210, making airflow smoother. The first air inlet 220 and the second air inlet 230 are connected without any walls, together forming the air inlet of the duct cavity 210, ensuring smooth airflow and reducing resistance. The third air inlet 320 and the second air outlet 330 are located on adjacent side walls of the connector 30, facilitating connection between them. This further increases the connectivity between the expansion cavity 310, the duct cavity 210, and the guide cavity 110, improving airflow efficiency and reducing noise interference.

[0048] In other embodiments, the third air inlet and the second air outlet may also be located on two non-adjacent side walls.

[0049] In some embodiments, the first air outlet 120 is disposed on the top wall of the housing 10, the side wall of the frame 20 is perpendicular to the top wall of the housing 10, the connector 30 is a right-angled triangular prism structure, the two side walls corresponding to the right-angled side of the connector 30 are respectively connected to the top wall of the housing 10 and the side wall of the frame 20, and the two side walls corresponding to the right-angled side of the connector 30 are respectively provided with a third air inlet 320 and a second air outlet 330.

[0050] Specifically, a third air inlet 320 and a second air outlet 330 are respectively provided on the two side walls corresponding to the right-angled side of the connector 30. The third air inlet 320 is connected to the first air outlet 120 on the top wall of the housing 10, and the second air outlet 330 is connected to the second air inlet 230 on the side wall of the frame 20.

[0051] The connector 30, with its right-angled triangular prism structure, is structurally stable and effectively utilizes space to achieve smooth airflow and reduce noise. Specifically, in the arrangement direction y of the housing 10 and the frame 20, the sidewalls corresponding to the hypotenuse of the right-angled triangular prism can connect to the two sidewalls corresponding to the right-angled sides, achieving a guiding and smoke-gathering effect, effectively guiding the airflow flowing into the expansion cavity 310 to the air duct cavity 210.

[0052] In other embodiments, the connector may also be a cubic structure or other three-dimensional structure.

[0053] In some embodiments, the side wall of the connector 30 is provided with a first snap-fit ​​portion, and the side wall of the frame 20 is provided with a second snap-fit ​​portion, and the first snap-fit ​​portion and the second snap-fit ​​portion are snap-fitted together.

[0054] The snap-fitting mechanism between the first snap-fitting part and the second snap-fitting part ensures a secure connection between the connector 30 and the frame 20.

[0055] In some embodiments, see Figure 6 , Figure 7 , Figure 8 , Figure 9 The connector 30 includes a first sidewall 31, a second sidewall 32, and a third sidewall 33 connected end to end. The first sidewall 31 is provided with a third air inlet 320, and the second sidewall 32 is provided with a second air outlet 330. In some embodiments, the third sidewall 33 is a planar structure; in some embodiments, the third sidewall 33 is curved.

[0056] The curved design of the third sidewall 33 helps guide airflow to a smooth direction, reducing vortex generation, further improving airflow efficiency, and reducing noise. It should be noted that the direction of curvature of the curved surface is not limited; for example… Figure 8 The third sidewall 33 is provided to protrude in the direction away from the expansion cavity 310, or for example... Figure 9 The third sidewall 33 is recessed inward toward the expansion cavity 310, etc.

[0057] It should be noted that the method of setting the curved surface is not limited. For example, in some application scenarios (not shown in the figure), the connection edge between the first and third sidewalls is an arc curve, and the connection edge between the second and third sidewalls is also an arc curve; for another example, in some application scenarios, see... Figure 8 The connector 30 also includes two end faces 35 that are connected to the first side wall (not shown), the second side wall (not shown), and the third side wall 33. The connection edge between the third side wall 33 and the two end faces 35 is an arc curve, and the connection edge between the third side wall 33 and the first side wall 31 and the second side wall 32 is a straight edge, etc.

[0058] In some embodiments, the first sidewall 31 of the connector 30 is fixedly connected to the top wall of the housing 10 by a screw structure. For example, a screw hole is provided on the first sidewall 31, and screws are used to lock the first sidewall 31 of the connector 30 to the top wall of the housing 10.

[0059] In some embodiments, the first sidewall 31 and the top wall of the housing 10 may also be connected by means of snap-fit, welding or other methods, and the specific connection is not limited.

[0060] In some embodiments, the first snap-fit ​​portion includes a first snap-fit ​​protrusion 34, and the second snap-fit ​​portion includes a snap-fit ​​groove; the second sidewall 32 extends toward the frame 20 to form the first snap-fit ​​protrusion 34, and the sidewall of the frame 20 forms a snap-fit ​​groove, and the first snap-fit ​​protrusion 34 snaps into the snap-fit ​​groove so that the second sidewall 32 of the connector 30 is connected to the sidewall of the frame 20.

[0061] Specifically, in one application scenario, the first snap-fit ​​protrusion 34 is a hook structure, and the snap-fit ​​groove includes a hanging hole. During installation, the hook structure is aligned with and inserted into the hanging hole on the side wall of the frame 20, and the hook is snapped into the hanging hole.

[0062] In other embodiments, the second snap-fit ​​portion includes a first snap-fit ​​protrusion, and the first snap-fit ​​portion includes a snap-fit ​​groove, the details of which will not be elaborated further.

[0063] In other embodiments, connection stability can be enhanced by providing multiple first snap-fit ​​portions and corresponding second snap-fit ​​portions.

[0064] In some embodiments, the range hood includes a housing 10, a frame 20, and two connectors 30. The housing 10 forms a flow guide cavity 110 and a first air outlet 120 communicating with the flow guide cavity 110. The frame 20 forms an air duct cavity 210 with a fan 40 inside, and the air duct cavity 210 is communicating with the flow guide cavity 110. The connectors 30 are connected to the housing 10 and the frame 20, and the connectors 30 form an expansion cavity 310, which is communicating with the flow guide cavity 110 and the air duct cavity 210 respectively. The frame 20 is positioned above the housing 10. The bottom of the frame 20 has a first air inlet 220 communicating with the air duct cavity 210 and the first air outlet 120. The side wall of the frame 20 has a second air inlet 230 communicating with the air duct cavity 210 and the expansion cavity 310. The connector 30 has a third air inlet 320 and a second air outlet 330. The third air inlet 320 communicates with the first air outlet 120 and the expansion cavity 310, and the second air outlet 330 communicates with the expansion cavity 310 and the second air inlet 230. The first air outlet 120 includes a second air outlet area 1202, a first air outlet area 1201, and a second air outlet area 1202 arranged sequentially along a first direction x. That is, the first air outlet 120 includes two second air outlet areas 1202 and one first air outlet area 1201. The first air outlet zone 1201 is connected to the first air inlet 220; each second air outlet zone 1202 is connected to the corresponding third air inlet 320 of the connecting piece 30. The first direction x is perpendicular to the arrangement direction y of the housing 10 and the frame 20.

[0065] The above configuration can form two expansion cavities 310 using two connectors 30, improving connection stability and expanding the airflow channel while reducing noise.

[0066] In some embodiments, the first air outlet 120 is disposed on the top wall of the housing 10, the side wall of the frame 20 is perpendicular to the top wall of the housing 10, and the two connectors 30 are both right-angled triangular prism structures, respectively disposed on both sides of the frame 20; wherein, the two side walls corresponding to the right-angled sides of the connector 30 are respectively connected to the top wall of the housing 10 and the side wall of the frame 20, and the two side walls corresponding to the right-angled sides of the connector 30 are respectively provided with a third air inlet 320 and a second air outlet 330.

[0067] In some embodiments, the first direction x is parallel to the horizontal direction and parallel to the top wall of the housing 10; the housing 10 and the frame 20 are arranged in the vertical direction.

[0068] In some embodiments, the range hood further includes a noise reduction component disposed on the side of the connector 30 away from the expansion cavity 310 to improve the noise reduction effect.

[0069] Unlike existing technologies, the range hood of this application includes a housing, a frame, and at least one connector. The housing forms a guide cavity and a first air outlet communicating with the guide cavity. The frame forms an air duct cavity containing a fan, which communicates with the guide cavity. The connector connects to the housing and the frame, and the connector forms an expansion cavity that communicates with both the guide cavity and the air duct cavity. In this way, the connector can connect the housing and the frame, improving the structural stability of the range hood. The expansion cavity effectively increases the cross-sectional area of ​​the airflow channel at the connection between the housing and the frame, thereby reducing airflow velocity and noise generation.

[0070] It is worth noting that the accompanying drawings are only for illustrating the structural and connection relationships of the product in this application, and do not limit the specific structural dimensions of the product in this application.

[0071] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A range hood, characterized in that, include: The housing forms a flow guide cavity and a first air outlet communicating with the flow guide cavity; The frame forms an air duct cavity containing a fan, and the air duct cavity is connected to the flow guide cavity; At least one connector is connected to the housing and the frame, the connector forming an expansion cavity, the expansion cavity being connected to the flow guide cavity and the air duct cavity respectively.

2. The range hood according to claim 1, characterized in that, In a plane perpendicular to the arrangement direction of the housing and the frame, the cross-sectional area of ​​the first air outlet of the air guide cavity is larger than the cross-sectional area of ​​the air inlet of the air duct cavity. Along the arrangement direction of the housing and the frame, the cross-sectional area of ​​the expansion cavity decreases from the housing toward the frame.

3. The range hood according to claim 1, characterized in that, The frame is positioned above the housing; the bottom of the frame is provided with a first air inlet communicating with the air duct cavity and the first air outlet, and the side wall of the frame is provided with a second air inlet communicating with the air duct cavity and the expansion cavity; The connector is provided with a third air inlet and a second air outlet. The third air inlet is connected to the first air outlet and the expansion cavity, and the second air outlet is connected to the expansion cavity and the second air inlet.

4. The range hood according to claim 3, characterized in that, The first air inlet and the second air inlet are connected without any wall to form the air inlet of the air duct cavity; the third air inlet and the second air outlet are disposed on adjacent side walls of the connector, and the third air inlet and the second air outlet are not connected without any wall.

5. The range hood according to claim 3, characterized in that, The first air outlet is located on the top wall of the housing, the side wall of the frame is perpendicular to the top wall of the housing, the connector is a right-angled triangular prism structure, the two side walls corresponding to the right angle side of the connector are respectively connected to the top wall of the housing and the side wall of the frame, and the third air inlet and the second air outlet are respectively provided on the two side walls corresponding to the right angle side of the connector.

6. The range hood according to claim 3, characterized in that, The first air outlet includes a first air outlet area and at least one second air outlet area arranged along a first direction. The first air outlet area is connected to the first air inlet. The second air outlet area is connected to the third air inlet. The first ratio of the size of the second air outlet area along the first direction to the size of the first air outlet area along the first direction is ≥0.

15. The first direction is perpendicular to the arrangement direction of the housing and the frame.

7. The range hood according to claim 3, characterized in that, The second air outlet has a dimension of ≥50mm along the arrangement direction of the housing and the frame.

8. The range hood according to claim 3, characterized in that, The first air outlet includes a first air outlet area and at least one second air outlet area arranged along a first direction. The first air outlet area is connected to the first air inlet. The second air outlet area is connected to the third air inlet. The second ratio of the projected area of ​​the second air outlet area in a plane perpendicular to the arrangement direction of the housing and the frame to the projected area of ​​the first air outlet area in a plane perpendicular to the arrangement direction is ≥0.

15. The first direction is perpendicular to the arrangement direction.

9. The range hood according to claim 1, characterized in that, The side wall of the connector is provided with a first snap-fit ​​part, and the side wall of the frame is provided with a second snap-fit ​​part, and the first snap-fit ​​part and the second snap-fit ​​part are snap-fitted together.

10. The range hood according to claim 3, characterized in that, The connector includes a first sidewall, a second sidewall, and a third sidewall connected end to end in sequence. The first sidewall is provided with the third air inlet, the second sidewall is provided with the second air outlet, and the third sidewall is arc-shaped.

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