Range hood

Abstract

This invention relates to a range hood, comprising: a smoke collection hood configured to form a smoke collection chamber; a fan hood connected to the smoke collection hood and configured to have an air duct communicating with the smoke collection chamber; and a backward centrifugal fan disposed within the air duct, wherein the direction of the rotation axis of the middle blades of the backward centrifugal fan is parallel to the direction in which the smoke collection hood points towards the fan hood. When the range hood is installed in the kitchen, the direction in which the smoke collection hood points towards the fan hood is vertical, and the rotation axis of the backward centrifugal fan is also set in the vertical direction. When the backward centrifugal fan operates, it draws smoke from the smoke collection chamber into the air duct and finally exhausts it from the air duct, thus achieving the smoke extraction function. Furthermore, the backward centrifugal fan has fewer blades, resulting in lower noise during air delivery, which can reduce the noise level of the range hood during operation.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, and in particular to range hoods. Background Technology

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. With the continuous improvement of people's living standards, range hoods have become an indispensable kitchen appliance in modern homes. Installed above the kitchen stove, it quickly removes waste from combustion and harmful fumes produced during cooking, expelling them outdoors, reducing indoor pollution, purifying the air, and providing safety features such as protection against poisoning and explosions.

[0003] Generally, the basic principle of a range hood is to use a forward centrifugal fan to create negative pressure in the smoke collection chamber, thereby drawing the fumes out of the kitchen. However, the forward centrifugal fan has densely packed and small blades, resulting in a relatively loud noise when the range hood is working. Summary of the Invention

[0004] This invention addresses the problem of excessive noise in traditional range hoods by proposing a range hood that effectively reduces noise.

[0005] A range hood, the range hood comprising:

[0006] The smoke hood is constructed to form a smoke collection chamber;

[0007] A fan shroud, connected to the smoke collection shroud, and configured to have an air duct communicating with the smoke collection chamber; and

[0008] A backward centrifugal fan is provided inside the air duct, and the direction of the rotation axis of the middle blade of the backward centrifugal fan is parallel to the direction in which the smoke hood points to the fan hood.

[0009] In the aforementioned range hood, the backward centrifugal fan is located within the duct, and the direction of the blade rotation axis of the backward centrifugal fan is parallel to the direction from the smoke collection hood to the fan hood. Understandably, when the range hood is installed in the kitchen, the direction from the smoke collection hood to the fan hood is vertical, and the rotation axis of the backward centrifugal fan is also set in the same direction. When the backward centrifugal fan is working, it draws the fumes from the smoke collection chamber into the duct and finally exhausts them through the duct, thus achieving the smoke extraction function. Furthermore, the backward centrifugal fan has fewer blades, resulting in lower noise during airflow, which helps reduce the noise level of the range hood during operation.

[0010] In one embodiment, the air duct has an inlet section and an outlet section that are interconnected.

[0011] The air inlet section is located between the smoke collection chamber and the air outlet section, and the backward centrifugal fan is located in the air inlet section.

[0012] In one embodiment, a noise reduction layer is also included, which is disposed on the inner wall of the air inlet section, and the air outlet of the backward centrifugal fan faces the noise reduction layer.

[0013] In one embodiment, the side of the noise reduction layer facing the rearward centrifugal fan is an annular surface; the diameter of the annular surface gradually increases in the direction from the air inlet section to the air outlet section.

[0014] In one embodiment, the projection of the centrifugal fan toward the noise reduction layer is entirely located on the noise reduction layer.

[0015] In one embodiment, the noise-reducing layer is made of noise-reducing cotton.

[0016] In one embodiment, an axial flow fan is also included, which is located in the air outlet section, and the rotation axis of the blades in the axial flow fan is arranged parallel to the rotation axis of the blades in the backward centrifugal fan.

[0017] In one embodiment, the direction in which the air duct extends is parallel to the direction in which the backward centrifugal fan points toward the axial fan.

[0018] In one embodiment, the backward centrifugal fan has a first air inlet and a first air outlet that are interconnected. The backward centrifugal fan has the first air inlet along the rotation axis of its own blades, and the backward centrifugal fan has the first air outlet in the circumferential direction of its own blades.

[0019] In one embodiment, the axial flow fan has a second air inlet and a second air outlet that are interconnected, the second air inlet and the second air outlet being arranged along the rotation axis of the blades in the axial flow fan, and the first air outlet being connected to the second air inlet. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a range hood in one embodiment of the present invention.

[0021] 100. Range hood; 10. Smoke hood; 11. Smoke collection chamber; 30. Fan cover; 31. Air duct; 312. Air inlet section; 314. Air outlet section; 50. Rearward centrifugal fan; 52. First air inlet; 54. First air outlet; 40. Noise reduction layer; 60. Axial flow fan; 62. Second air inlet; 64. Second air outlet. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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 invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] Figure 1 A schematic diagram of the structure of a range hood according to an embodiment of the present invention is shown.

[0029] See Figure 1 In one embodiment of the present invention, a range hood 100 is provided, including a smoke collection hood 10, a fan hood 30, and a backward centrifugal fan 50. The smoke collection hood 10 is configured to form a smoke collection chamber 11. The fan hood 30 is connected to the smoke collection hood 10 and is configured to have an air duct 31 communicating with the smoke collection chamber 11. The backward centrifugal fan 50 is disposed in the air duct 31, and the direction of the rotation axis of the blades in the backward centrifugal fan 50 is parallel to the direction in which the smoke collection hood 10 points towards the fan hood 30. Understandably, when the range hood 100 is installed in the kitchen, the direction in which the smoke collection hood 10 points towards the fan hood 30 is vertical, and the rotation axis of the backward centrifugal fan 50 is also set in the vertical direction. When the backward centrifugal fan 50 is working, it can draw smoke from the smoke collection chamber 11 into the air duct 31 and finally discharge it from the air duct 31, thus achieving the smoke extraction function. Furthermore, the backward centrifugal fan 50 has fewer blades, resulting in less noise during air delivery, which can reduce the noise level of the range hood 100 during operation.

[0030] Furthermore, the air duct 31 includes an inlet section 312 and an outlet section 314 that are interconnected; wherein, the inlet section 312 is located between the smoke collection chamber 11 and the outlet section 314, and the backward centrifugal fan 50 is located in the inlet section 312. That is to say, the backward centrifugal fan 50 located in the inlet section 312 drives the oil fumes into the smoke collection chamber 11, and then flows to the outside through the outlet section 314 after passing through the inlet section 312.

[0031] Furthermore, the range hood 100 also includes a noise reduction layer 40. The noise reduction layer 40 is installed on the inner wall of the air inlet section 312, and the outlet of the backward centrifugal fan 50 faces the noise reduction layer 40. This way, the airflow blown by the backward centrifugal fan 50 will not directly impact the inner wall of the air inlet section 312, but will instead absorb the flow noise of the airflow through the noise reduction layer 40, further reducing the noise of the range hood 100 during operation. Moreover, the airflow blown by the backward centrifugal fan 50 is directed towards the noise reduction layer 40, and then changes direction at the noise reduction layer 40 before entering the air outlet section 314 and flowing outdoors. This airflow change at the noise reduction layer 40 reduces the noise generated by the airflow reversal. Optionally, the noise reduction layer 40 is made of noise-reducing cotton, which has a good sound absorption effect.

[0032] Specifically, the side of the noise reduction layer 40 facing the rearward centrifugal fan 50 is a ring surface; the diameter of the ring surface gradually increases in the direction from the air inlet section 312 to the air outlet section 314, that is, in the direction of airflow, the diameter of the noise reduction layer 40 gradually increases, so as to gradually disperse the gathered airflow, allow the airflow to flow smoothly, reduce airflow resistance, and reduce noise when the airflow flows.

[0033] More specifically, the projection of the backward centrifugal fan 50 toward the noise reduction layer 40 is entirely located on the noise reduction layer 40. This results in a wide coverage area of ​​the noise reduction layer 40, which can cover the blowing range of the backward centrifugal fan 50 and effectively absorb the noise generated by the airflow blown out by the backward centrifugal fan 50.

[0034] In some embodiments, the range hood 100 also includes an axial flow fan 60, which is located in the air outlet section 314. The rotation axis of the blades in the axial flow fan 60 is parallel to the rotation axis of the blades in the backward centrifugal fan 50. This allows the axial flow fan 60 and the backward centrifugal fan 50 to work together, enabling the fumes to directly enter the air outlet of the backward centrifugal fan 50 through the smoke collection chamber 11, thereby improving the smoke collection efficiency of the range hood 100. Furthermore, the backward centrifugal fan 50, with its fewer blades and lower noise, reduces the noise level of the range hood 100 during operation. In addition, the axial flow fan 60 reduces the static pressure within the air duct 31, maximizing the airflow of the range hood 100, improving the air environment in the cooking area, and comprehensively enhancing the performance of the range hood 100.

[0035] Furthermore, the extension direction of the air duct 31 is parallel to the direction from the rearward centrifugal fan 50 to the axial fan 60, which is equivalent to the air duct 31 being set as a straight line. The rearward centrifugal fan 50 and the axial fan are arranged in sequence in the air duct 31, making installation simple.

[0036] Specifically, the backward centrifugal fan 50 has a first air inlet 52 and a first air outlet 54 that are interconnected. The backward centrifugal fan 50 has a first air inlet 52 along the rotation axis of its own blades, and the backward centrifugal fan 50 has a first air outlet 54 formed radially along the circumference formed by the rotation of its own blades. In this way, airflow can enter the backward centrifugal fan 50 axially through the first air inlet 52, then flow out of the backward centrifugal fan 50 radially through the first air outlet 54, and then blow onto the noise reduction layer 40 before flowing to the outside through the air duct 31.

[0037] Furthermore, the axial flow fan 60 has a second air inlet 62 and a second air outlet 64 that are interconnected. The second air inlet 62 and the second air outlet 64 are arranged along the direction of the blade rotation axis in the axial flow fan 60, and the first air outlet 54 and the second air inlet 62 are connected. Thus, the airflow exits from the first air outlet 54 of the backward centrifugal fan 50 and enters the second air inlet 62 of the axial flow fan 60, then exits through the second air outlet 64 along the axial direction of the axial flow fan 60. In this way, when the axial flow fan 60 is operating, it draws the gas in the duct 31 upwards, allowing the fumes to be discharged vertically from the duct 31. This reduces the air pressure inside the duct 31, creating a negative pressure. The negative pressure inside the duct 31 helps improve the working conditions of the backward centrifugal fan 50 and enhances its performance. The simultaneous operation of the backward centrifugal fan 50 and the axial flow fan 60 in the exhaust fan achieves the effect of reducing noise while increasing the size of the duct 31.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A range hood characterized by, The oil extractor hood comprises: A smoke collecting hood (10) configured to form a smoke collecting cavity (11); A fan cover (30) connected with the smoke collecting hood (10) and configured to have an air duct (31) communicating with the smoke collecting cavity (11); and A backward centrifugal fan (50) provided in the air duct (31), a direction of a rotation axis of a middle blade of the backward centrifugal fan (50) being parallel to a direction in which the smoke collecting hood (10) points to the fan cover (30); The air duct (31) comprises an air inlet section (312) and an air outlet section (314) communicating with each other; the air inlet section (312) is located between the smoke collecting cavity (11) and the air outlet section (314), and the backward centrifugal fan (50) is provided in the air inlet section (312); and a axial flow fan (60) is provided in the air outlet section (314), and a rotation axis of a middle blade of the axial flow fan (60) is arranged parallel to the rotation axis of the middle blade of the backward centrifugal fan (50); The backward centrifugal fan (50) has a first air inlet (52) and a first air outlet (54) communicating with each other; the first air inlet (52) is arranged along a direction of the rotation axis of the middle blade of the backward centrifugal fan (50), and the first air outlet (54) is arranged along a radial direction of a circumference formed by rotation of the middle blade of the backward centrifugal fan (50); the axial flow fan (60) has a second air inlet (62) and a second air outlet (64) communicating with each other; the second air inlet (62) and the second air outlet (64) are arranged along a direction of a rotation axis of a middle blade of the axial flow fan (60), and the first air outlet (54) communicates with the second air inlet (62).

2. The hood according to claim 1, characterized in that, A noise reduction layer (40) is further provided; the noise reduction layer (40) is arranged on an inner wall of the air inlet section (312), and an air outlet of the backward centrifugal fan (50) faces the noise reduction layer (40).

3. The hood according to claim 2, characterized in that, One side of the noise reduction layer (40) facing the backward centrifugal fan (50) is a circular ring surface; in a direction in which the air inlet section (312) points to the air outlet section (314), a diameter of the circular ring surface gradually increases.

4. The hood according to claim 2, characterized in that, Projections of the centrifugal fan on the noise reduction layer (40) are all located on the noise reduction layer (40).

5. The hood according to any one of claims 2-4, characterized in that, The noise reduction layer (40) is made of noise reduction cotton.

6. The hood according to claim 1, characterized in that, An extension direction of the air duct (31) is parallel to a direction in which the backward centrifugal fan (50) points to the axial flow fan (60).

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