Tabletop smoke exhaust ventilator

Abstract

The utility model discloses a desktop smoke exhaust ventilator which comprises a mounting base, a smoke exhaust ventilator shell is arranged on the mounting base, an air inlet and an air outlet are formed in the smoke exhaust ventilator shell, a filtering assembly is arranged at the air inlet, and a centrifugal fan device is arranged between the filtering assembly and the air outlet. The centrifugal fan device comprises a centrifugal impeller and a diffusion cover arranged outside the centrifugal impeller in a covering mode, a diffusion air channel is defined between the periphery of the centrifugal impeller and the inner wall of the diffusion cover, and the diffusion cover is provided with a suction inlet adjacent to the filtering assembly and a backflow air guide opening located in the downstream position of the centrifugal impeller and communicated with the diffusion air channel. And the centrifugal impeller drives airflow to radially outwards flow into the diffusion air duct. When air flow enters the diffusion cover body from the suction inlet under the driving of the centrifugal impeller, gradually-expanding flow is generated, the speed of the air flow is reduced, the pressure of the air flow is increased, then the air flow is blown out in the axial direction parallel to the centrifugal impeller through the backflow air guide opening, the blown-out air volume is large, the lampblack filtering efficiency is improved, and noise is low.

Description

Technical Field

[0001] This utility model relates to a desktop range hood. Background Technology

[0002] Compared to traditional range hoods installed above the kitchen stove, desktop range hoods offer greater flexibility in their use. They can be used in spaces such as the living room or dining room to separate the oil fumes generated during cooking. For example, when people are eating hot pot in a restaurant, a desktop range hood can be used to separate the large amount of oil fumes and water vapor produced during cooking into oil and water, reducing air pollution and providing a better dining environment.

[0003] Existing desktop range hoods generally use ordinary axial flow fans. Axial flow fans are noisy and have low air volume when working, resulting in poor filtration of oil fumes. In addition, oil film easily accumulates on the surface, which increases the load on the motor over time. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a desktop range hood with large air volume and low noise to improve the oil fume filtration effect.

[0005] A desktop range hood according to an embodiment of the present invention includes: a mounting base, on which a range hood housing is provided, the range hood housing having an air inlet and an air outlet, a filter assembly being provided at the air inlet, and a centrifugal fan device being provided between the filter assembly and the air outlet, the centrifugal fan device including a centrifugal impeller and a diffuser shroud covering the outside of the centrifugal impeller, a diffuser duct being defined between the outer periphery of the centrifugal impeller and the inner wall of the diffuser shroud, the diffuser shroud having an intake port adjacent to the filter assembly and a return air guide port located downstream of the centrifugal impeller and communicating with the diffuser duct, the centrifugal impeller driving airflow radially outward into the diffuser duct, and the return air guide port driving the airflow passing through the diffuser duct to exit from the air outlet along an axial direction parallel to the centrifugal impeller.

[0006] The desktop range hood according to the embodiments of the present utility model has at least the following beneficial effects:

[0007] The desktop range hood with the above structure is driven by a centrifugal fan to make the external airflow pass through the air inlet, filter components, diffuser duct and air outlet in sequence. When the airflow enters the diffuser hood from the inlet under the drive of the centrifugal impeller, it generates a gradually expanding flow, the airflow speed decreases and the pressure increases, and then it is blown out along the axis parallel to the centrifugal impeller through the return air guide. The blown air volume is large to improve the oil fume filtration efficiency, and the noise is low.

[0008] In some embodiments of this utility model, the centrifugal impeller includes a conical surface and a plurality of moving blades axially spaced around the centrifugal impeller and distributed on the conical surface, the smaller end of the conical surface being close to the filter assembly, and the moving blades extending toward the filter assembly.

[0009] In some embodiments of this utility model, the centrifugal impeller has an impeller wall plate forming a conical or frustum shape, the outer surface of the impeller wall plate constitutes the conical surface, the inner surface of the impeller wall plate defines a first cavity, the diffuser housing is provided with a second cavity opposite to the first cavity, the opening of the first cavity abuts against the opening of the second cavity to form a closed space, and a motor connected to the centrifugal impeller is provided in the closed space.

[0010] In some embodiments of this utility model, the diffuser shroud is provided with an arched wall plate that is opposite to the impeller wall plate. The inner peripheral wall of the arched wall plate defines the second concave cavity. The outer peripheral wall of the arched wall plate is provided with a plurality of guide plates spaced apart around the axial direction of the centrifugal impeller. The return air guide is defined between the guide plates.

[0011] In some embodiments of this utility model, the outer peripheral wall of the arched wall panel is bowl-shaped, and the outer peripheral wall of the arched wall panel gradually approaches the axial direction of the centrifugal impeller along the direction of the air outlet. The guide plate is connected between the outer peripheral wall of the arched wall panel and the inner peripheral wall of the diffuser shroud.

[0012] In some embodiments of this utility model, the guide plate is spirally arranged around the axial direction of the centrifugal impeller, and the air outlet is provided with a plurality of ribs spaced apart around the axial direction of the centrifugal impeller and consistent with the spiral direction of the guide plate.

[0013] In some embodiments of this utility model, the diffuser shroud includes a first half-shell and a second half-shell that are connected at both ends. The first half-shell and the second half-shell are assembled together to form a drum shape. The radial dimensions of the first half-shell and the second half-shell decrease from the end that is close to each other to the end that is far away from each other. The inlet and the return air duct are respectively located at one end of the first half-shell and the second half-shell.

[0014] In some embodiments of this utility model, the filter assembly includes an annular mounting plate detachably disposed on the inner peripheral edge of the air inlet, and a filter screen is provided in the middle of the annular mounting plate.

[0015] In some embodiments of this utility model, an activated carbon box is further provided between the filter screen and the inlet, and the activated carbon box is provided with an air inlet hole group that connects the air inlet and the inlet.

[0016] In some embodiments of this utility model, the mounting base is provided with an upwardly extending column, and the smoke hood housing is rotatably connected to the upper part of the column through a rotating shaft assembly, the rotating shaft assembly having a damping structure or an angle positioning structure.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment of the desktop range hood of this utility model;

[0020] Figure 2 for Figure 1 Schematic diagram of the structural breakdown of the embodiment;

[0021] Figure 3 for Figure 1 A cross-sectional schematic diagram of an embodiment;

[0022] Figure 4 A cross-sectional schematic diagram of one embodiment of a centrifugal fan device;

[0023] Figure 5 for Figure 4 Schematic diagram of structural breakdown of the embodiment.

[0024] Figure label:

[0025] Mounting base 100; column 110; smoke hood housing 200; air inlet 201; air outlet 202; filter assembly 300; annular mounting plate 310; filter screen 320; centrifugal fan device 400; centrifugal impeller 410; conical surface 411; moving blade 412; first cavity 413; diffuser hood 420; first half-shell 421; second half-shell 422; arched wall panel 423; second cavity 424; guide plate 425; diffuser duct 430; suction inlet 440; return air guide 450; activated carbon box 500. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. 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.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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.

[0030] See Figures 1 to 3 This utility model discloses a desktop range hood, comprising: a mounting base 100, on which a range hood housing 200 is mounted, the range hood housing 200 having an air inlet 201 and an air outlet 202, a filter assembly 300 being provided at the air inlet 201, and a centrifugal fan device 400 being provided between the filter assembly 300 and the air outlet 202, the centrifugal fan device 400 including a centrifugal impeller 410 and a diffuser shroud 420 covering the centrifugal impeller 410, the outer periphery of the centrifugal impeller 410 being connected to the outer periphery of the impeller 410. The inner walls of the diffuser shroud 420 define a diffuser duct 430. The diffuser shroud 420 has an intake port 440 located adjacent to the filter assembly 300 and a return air guide port 450 located downstream of the centrifugal impeller 410 and connected to the diffuser duct 430. The centrifugal impeller 410 drives the airflow radially outward into the diffuser duct 430, and the return air guide port 450 drives the airflow passing through the diffuser duct 430 to be discharged from the outlet 202 along an axial direction parallel to the centrifugal impeller 410.

[0031] The desktop range hood with the above structure is driven by a centrifugal fan 400, which causes external airflow to pass sequentially through the air inlet 201, the filter assembly 300, the diffuser duct 430, and the air outlet 202. When the airflow enters the diffuser hood 420 from the suction inlet 440 under the drive of the centrifugal impeller 410, it generates a gradually expanding flow, the airflow speed decreases, and the pressure increases. Then, it passes through the return air guide 450 and is blown out along the axis parallel to the centrifugal impeller 410. The blown air volume is large to improve the oil fume filtration efficiency, and the noise is low.

[0032] See Figure 4 and Figure 5 In some embodiments of this utility model, the centrifugal impeller 410 includes a conical surface 411 and a plurality of moving blades 412 axially spaced around the centrifugal impeller 410 and distributed on the conical surface 411. The smaller end of the conical surface 411 is close to the filter assembly 300, and the moving blades 412 extend toward the filter assembly 300. It can be understood that when the centrifugal impeller 410 rotates, it drives the airflow outside the range hood housing 200 to enter through the air inlet 201, pass through the filter assembly 300, and then contact the conical surface 411. The moving blades 412 drive the airflow to move along the larger end of the conical surface 411, thereby generating radial outward flow and entering the diffuser duct 430. The centrifugal impeller 410 with the above structure also helps to prevent oil fumes from remaining on the surface, avoiding increased load on the motor.

[0033] See Figure 4 and Figure 5 In some embodiments of this utility model, the centrifugal impeller 410 has an impeller wall plate forming a conical or frustum shape. The outer surface of the impeller wall plate constitutes the conical surface 411, and the inner surface of the impeller wall plate defines a first cavity 413. The diffuser shroud 420 has a second cavity 424 opposite to the first cavity 413. The opening of the first cavity 413 abuts against the opening of the second cavity 424 to form a closed space. A motor (not shown in the figure) connected to the centrifugal impeller 410 is disposed in the closed space. It should be noted that the impeller wall plate of the above structure has a relatively thin wall thickness, resulting in a smaller dynamic load on the motor. At the same time, the closed space formed by the first cavity 413 and the second cavity 424 is used to accommodate the motor, avoiding obstruction of the airflow by the motor and helping to reduce noise.

[0034] See Figure 4 and Figure 5In some embodiments of this utility model, the diffuser shroud 420 is provided with an arched wall plate 423 opposite to the impeller wall plate. The inner peripheral wall of the arched wall plate 423 defines the second recess 424, and the outer peripheral wall of the arched wall plate 423 is provided with a plurality of guide plates 425 spaced apart around the axial direction of the centrifugal impeller 410. The return air guide port 450 is defined between the guide plates 425. It can be understood that when the airflow flowing along the conical surface 411 leaves the larger end of the conical surface 411, it enters the diffuser duct 430. Then, the airflow in the diffuser duct 430 flows along the outer peripheral wall of the arched wall plate 423 toward the air outlet 202. During this process, the return air guide port 450 between adjacent guide plates 425 guides the airflow toward the middle position of the arched wall plate 423, thereby causing the airflow to have radial inward displacement and displacement toward the air outlet 202.

[0035] See Figure 4 In some embodiments of this utility model, the outer peripheral wall of the arched wall panel 423 is bowl-shaped, and the outer peripheral wall of the arched wall panel 423 gradually moves towards the axial direction of the centrifugal impeller 410 along the direction of the air outlet 202. This is beneficial for guiding the airflow from the diffuser duct 430 to the air outlet 202 and discharging it approximately horizontally. The guide plate 425 is connected between the outer peripheral wall of the arched wall panel 423 and the inner peripheral wall of the diffuser shroud 420. This is beneficial for the relative stability between adjacent guide plates 425 and prevents high-pressure gas from acting on the guide plate 425 and causing the guide plate 425 to vibrate.

[0036] See Figure 4 and Figure 5 In some embodiments of this utility model, the guide plate 425 is spirally arranged around the axial direction of the centrifugal impeller 410, and the air outlet 202 is provided with a plurality of ribs spaced apart around the axial direction of the centrifugal impeller 410 and consistent with the spiral direction of the guide plate 425. It is understood that the airflow driven by the centrifugal impeller 410 still has a spiral forward motion tendency when entering the diffuser duct 430. The arrangement of the guide plate 425 and the ribs helps to reduce wind resistance and noise.

[0037] See Figures 3 to 5 In some embodiments of this utility model, in order to facilitate assembly and production and to form a dimensionally stable and smooth diffuser duct 430, the diffuser cover 420 includes a first half-shell 421 and a second half-shell 422 that are connected at both ends. The first half-shell 421 and the second half-shell 422 are assembled together to form a drum shape. The radial dimensions of the first half-shell 421 and the second half-shell 422 decrease from the end that is close to each other to the end that is far away from each other. The intake port 440 and the return air guide port 450 are respectively located at one end of the first half-shell 421 and the second half-shell 422.

[0038] See Figure 2 and Figure 3 In some embodiments of this utility model, the filter assembly 300 includes an annular mounting plate 310 detachably disposed on the inner peripheral edge of the air inlet 201, and a filter screen 320 is provided in the middle of the annular mounting plate 310. Generally, the filter screen 320 is made of at least one material such as non-woven fabric, stainless steel mesh, or ceramic porous plate, which is beneficial for fully filtering oil fumes. After the filter screen 320 has been used for a period of time, the annular mounting plate 310 can be removed and replaced from the air inlet 201.

[0039] See Figure 2 and Figure 3 In some embodiments of this utility model, an activated carbon box 500 is further provided between the filter screen 320 and the intake port 440. The activated carbon box 500 is provided with an air inlet group that connects the air inlet 201 and the intake port 440. By adding the activated carbon box 500, harmful substances, odors and volatile organic compounds in the fumes can be efficiently removed, improving air quality. The airflow first passes through the filter screen 320 and then through the air inlet group and the activated carbon particles to achieve the above purpose.

[0040] See Figure 1 In some embodiments of this utility model, in order to adjust the tilt angle of the desktop range hood to adapt to different usage needs, the mounting base 100 is provided with an upwardly extending column 110, and the range hood housing 200 is rotatably connected to the upper part of the column 110 through a rotating shaft assembly, the rotating shaft assembly having a damping structure or an angle positioning structure.

[0041] 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.

[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A desktop range hood, characterized in that, include: A mounting base (100) is provided, on which a range hood housing (200) is provided. The range hood housing (200) is provided with an air inlet (201) and an air outlet (202). A filter assembly (300) is provided at the air inlet (201). A centrifugal fan device (400) is provided between the filter assembly (300) and the air outlet (202). The centrifugal fan device (400) includes a centrifugal impeller (410) and a diffuser shroud (420) covering the outside of the centrifugal impeller (410). The outer periphery of the centrifugal impeller (410) and the diffuser shroud (420) are connected. A diffuser duct (430) is defined between the inner walls of the 420. The diffuser duct (420) has an intake port (440) located adjacent to the filter assembly (300) and a return air guide port (450) located downstream of the centrifugal impeller (410) and communicating with the diffuser duct (430). The centrifugal impeller (410) drives the airflow radially outward into the diffuser duct (430), and the return air guide port (450) drives the airflow passing through the diffuser duct (430) to be discharged from the outlet (202) along an axial direction parallel to the centrifugal impeller (410).

2. A desktop range hood according to claim 1, characterized in that: The centrifugal impeller (410) includes a conical surface (411) and a plurality of moving blades (412) axially spaced around the centrifugal impeller (410) and distributed on the conical surface (411). The smaller end of the conical surface (411) is close to the filter assembly (300), and the moving blades (412) extend toward the filter assembly (300).

3. A desktop range hood according to claim 2, characterized in that: The centrifugal impeller (410) has an impeller wall plate that forms a cone or frustum shape. The outer surface of the impeller wall plate constitutes the conical surface (411). The inner surface of the impeller wall plate defines a first cavity (413). The diffuser shroud (420) has a second cavity (424) that is opposite to the first cavity (413). The opening of the first cavity (413) abuts against the opening of the second cavity (424) to form a closed space. A motor connected to the centrifugal impeller (410) is provided in the closed space.

4. A desktop range hood according to claim 3, characterized in that: The diffuser shroud (420) is provided with an arched wall plate (423) opposite to the impeller wall plate. The inner peripheral wall of the arched wall plate (423) defines the second cavity (424). The outer peripheral wall of the arched wall plate (423) is provided with a plurality of guide plates (425) spaced apart around the axial direction of the centrifugal impeller (410). The return air inlet (450) is defined between the guide plates (425).

5. A desktop range hood according to claim 4, characterized in that: The outer peripheral wall of the arched wall panel (423) is bowl-shaped, and the outer peripheral wall of the arched wall panel (423) gradually moves towards the axial direction of the centrifugal impeller (410) along the direction of the air outlet (202). The guide plate (425) is connected between the outer peripheral wall of the arched wall panel (423) and the inner peripheral wall of the diffuser shroud (420).

6. A desktop range hood according to claim 4, characterized in that: The guide plate (425) is spirally arranged around the centrifugal impeller (410) and the air outlet (202) is provided with a plurality of ribs spaced apart around the centrifugal impeller (410) and consistent with the direction of rotation of the guide plate (425).

7. A desktop range hood according to claim 1, characterized in that: The diffuser shroud (420) includes a first half-shell (421) and a second half-shell (422) that are connected at both ends. The first half-shell (421) and the second half-shell (422) are assembled together to form a drum shape. The radial dimensions of the first half-shell (421) and the second half-shell (422) decrease from the end that is close to each other to the end that is far away from each other. The intake port (440) and the return air guide port (450) are respectively located at one end of the first half-shell (421) and the second half-shell (422).

8. A desktop range hood according to claim 1, characterized in that: The filter assembly (300) includes an annular mounting plate (310) detachably disposed on the inner peripheral edge of the air inlet (201), and a filter screen (320) is provided in the middle of the annular mounting plate (310).

9. A desktop range hood according to claim 8, characterized in that: An activated carbon box (500) is also provided between the filter screen (320) and the inlet (440), and the activated carbon box (500) is provided with an air inlet hole group that connects the air inlet (201) and the inlet (440).

10. A desktop range hood according to claim 1, characterized in that: The mounting base (100) is provided with an upwardly extending column (110), and the smoke machine housing (200) is rotatably connected to the upper part of the column (110) through a rotating shaft assembly, the rotating shaft assembly having a damping structure or an angle positioning structure.

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