Range hood

Abstract

The utility model relates to kitchen appliance technical field, especially a kind of range hood.It is the range hood of the utility model, including the shell with air inlet, fan with volute is arranged in shell, the bottom of volute is fixedly connected with the first flow guide plate extending along the first horizontal direction perpendicular to its axial direction;The inner wall of shell is fixedly provided with second flow guide plate, and the bottom of second flow guide plate is located in the area of the corresponding air inlet of shell;First flow guide plate, second flow guide plate, the inner wall of shell and the outer wall of volute are enclosed to form inlet side acceleration section, and the flow cross-sectional area of inlet side acceleration section gradually decreases along airflow flow direction.By the flow cross-sectional area of inlet side acceleration section gradually decreasing along airflow flow direction, airflow speed is improved, fluid dead zone is reduced, airflow flows quickly and steadily by first flow guide plate and second flow guide plate, vortex generation is inhibited, air intake efficiency is improved, and noise is reduced.

Description

Technical Field

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

[0002] A range hood typically consists of a housing, a fan housed within the housing, and an air inlet located at the bottom of the housing. During operation, outside air carrying cooking fumes enters through the air inlet, flows through the fan, and is exhausted through the exhaust outlet. However, during airflow, a fluid dead zone easily forms in the intake area between the inner wall of the housing and the outer wall of the fan's volute. Because the airflow velocity in this dead zone is extremely low, insufficient local negative pressure results in reduced intake efficiency. Furthermore, when airflow passes through structural corners within the housing, eddies are easily generated, increasing noise. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of existing range hoods, such as the formation of fluid dead zones inside, reduced air intake efficiency, easy generation of eddies, and high noise, and to provide a range hood.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] A range hood includes a housing with an air inlet, a fan with a volute disposed inside the housing, a first guide plate extending in a first horizontal direction perpendicular to the fan's axis being fixedly connected to the bottom of the volute; a second guide plate being fixedly disposed on the inner wall of the housing, the bottom of the second guide plate being located in the area of ​​the housing corresponding to the air inlet; the first guide plate, the second guide plate, the inner wall of the housing, and the outer wall of the volute enclose an inlet-side acceleration section, the flow cross-sectional area of ​​the inlet-side acceleration section gradually decreasing along the airflow direction.

[0006] In this scheme, the cross-sectional area of ​​the acceleration section on the inlet side gradually decreases along the airflow direction, thereby increasing the airflow velocity and reducing the fluid dead zone. The first and second guide vanes enable the airflow to flow quickly and smoothly, suppressing eddy current generation, improving air intake efficiency, and reducing noise.

[0007] Optionally, the volute is fixedly disposed in the middle of the housing along its axial direction, and the volute divides the interior of the housing into a main airflow channel and a secondary airflow channel along its axial direction; the number of the second guide plates is at least two, wherein at least one of the second guide plates is fixed to the area of ​​the inner wall of the housing corresponding to the main airflow channel, and the other second guide plate is fixedly disposed in the area of ​​the inner wall of the housing corresponding to the secondary airflow channel.

[0008] In this solution, dual-side zoned air intake is achieved through the main airflow channel and the secondary airflow channel. The airflow enters the interior of the volute from both sides, improving the efficiency of oil fume collection.

[0009] Optionally, the volute has a main air inlet and a secondary air inlet on opposite sides of its axial direction, and a third guide plate is provided on the inner wall of the casing in the area corresponding to the main air inlet and the secondary air inlet; the third guide plate, the inner wall of the casing and the outer wall of the volute form an outlet-side acceleration section, and the flow cross-sectional area of ​​the outlet-side acceleration section gradually decreases along the airflow direction.

[0010] In this design, the cross-sectional area of ​​the acceleration section on the outlet side gradually decreases along the airflow direction to allow the airflow inside the casing to be discharged quickly, while also preventing eddies and reducing noise.

[0011] Optionally, at least one of the first guide plate, the second guide plate, and the third guide plate includes a support plate and a sound-absorbing layer that is attached and fixed to one side or opposite sides of the support plate.

[0012] In this solution, the noise reduction performance of the range hood is improved by absorbing airflow noise through a sound-absorbing layer.

[0013] Optionally, the first guide plate includes a main flow section and a secondary flow section fixedly connected to each other. The main flow section and the secondary flow section are respectively inclined upward and outward in the vertical direction, and are respectively disposed opposite to the second guide plates in the main airflow channel and the secondary airflow channel.

[0014] In this scheme, the first and second guide vanes guide the airflow to flow more smoothly through the inlet acceleration sections of the main airflow channel and the secondary airflow channel, thereby reducing airflow resistance, improving flow efficiency, and increasing air volume at the same fan speed.

[0015] Optionally, an oil cup is provided at the bottom of the housing. The oil cup is located below the first guide plate and is in fluid communication with the first guide plate through an oil guiding structure. The oil guiding structure includes an oil guiding plate, which is located at the bottom of the first guide plate and connected between the main flow section and the secondary flow section. The oil guiding plate extends downward from its middle part along the first horizontal direction to its downstream end.

[0016] In this design, the oil droplets seeping from inside the volute are guided into the oil cup by an oil-guiding structure.

[0017] Optionally, the oil guiding structure further includes an oil guiding pipe, the first end of which is connected to the downstream end of the oil guiding plate, and the second end of which extends above or inside the oil cup. A mounting beam extending axially along the volute is fixedly disposed within the housing; the oil guiding structure also includes an oil guiding channel located in the region of the mounting beam corresponding to the downstream end of the oil guiding plate, and the oil guiding pipe is in fluid communication with the downstream end of the oil guiding plate through the oil guiding channel.

[0018] In this scheme, the oil on the surface of the oil guide plate is guided to drip into the oil cup along a preset path through the guide channel and the oil guide pipe.

[0019] Optionally, the oil guiding structure further includes an oil inlet, which is located in the area of ​​the mounting beam corresponding to the oil guiding channel and below the oil guiding plate. The projection of the oil inlet in the vertical direction is at least partially located within the projection range of the downstream end of the oil guiding plate.

[0020] In this solution, the oil inlet nozzle allows the oil on the surface of the oil guide plate to flow more smoothly into the oil guide channel of the mounting beam. The projection of the oil inlet nozzle in the vertical direction is at least partially located within the projection range of the downstream end of the oil guide plate, which prevents the oil from flowing backward under the action of airflow, thereby ensuring that the oil flows along the preset oil guide path.

[0021] Optionally, the oil guiding structure further includes an oil collection box, which is fixed to the area of ​​the mounting beam corresponding to the oil guiding channel. The first end of the oil guiding pipe is fixedly connected to the bottom of the oil collection box, and the oil collection box is at least partially located below the oil guiding plate.

[0022] In this design, the oil on the surface of the oil guide plate flows sequentially into the oil collection box through the oil guide channel under gravity, and then flows to the oil cup through the oil guide pipe fixedly connected to the bottom of the oil collection box. Under high oil fume conditions, due to the rapid condensation speed and large flow rate of the oil, the oil collection box can temporarily store the oil, preventing oil overflow caused by instantaneous flow overload in the oil guide channel, and improving the convenience and reliability of the connection, as well as facilitating maintenance and cleaning.

[0023] The positive and progressive effects of this utility model are as follows:

[0024] The range hood of this invention increases the airflow speed and reduces the fluid dead zone by gradually reducing the cross-sectional area of ​​the inlet side acceleration section along the airflow direction. The first and second guide plates enable the airflow to flow quickly and smoothly, suppressing the generation of eddies, improving air intake efficiency, and reducing noise. Attached Figure Description

[0025] Figure 1 This is a first-view structural schematic diagram of a range hood according to an embodiment of the present invention.

[0026] Figure 2 This is a second-view structural schematic diagram of a range hood according to an embodiment of the present invention.

[0027] Figure 3 for Figure 2 Schematic diagram of the sectional view along the AA direction.

[0028] Figure 4 This is a schematic diagram of the structure of a range hood with the fan frame removed according to an embodiment of the present invention.

[0029] Figure 5 This is a first-view structural schematic diagram of the smoke collection hood and the second guide plate according to an embodiment of the present invention.

[0030] Figure 6 This is a structural schematic diagram of the smoke collection hood and the second guide plate from a second perspective, according to an embodiment of the present invention.

[0031] Figure 7 This is a schematic diagram of the structure of the fan and the first guide plate according to an embodiment of the present invention.

[0032] Figure 8 This is an exploded structural diagram of the first guide plate according to an embodiment of the present invention.

[0033] Figure 9 A schematic diagram (I) of a range hood with the housing removed, according to an embodiment of the present invention.

[0034] Figure 10 for Figure 9 A magnified view of a portion of point B in the middle.

[0035] Figure 11 This is a schematic diagram (II) of the structure of a range hood with the housing removed, according to an embodiment of the present invention.

[0036] Figure 12 for Figure 11 A magnified view of a portion of point C.

[0037] Figure 13 This is a schematic diagram of the installation beam according to an embodiment of the present invention.

[0038] Figure 14 This is a cross-sectional schematic diagram of a range hood according to an embodiment of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] Casing 1

[0041] Smoke hood 11

[0042] Air inlet 111

[0043] Wind turbine frame 12

[0044] Air hood 122

[0045] Fan 2

[0046] 21 worm shell

[0047] Main air intake 211

[0048] Secondary air intake 212

[0049] Air outlet 213

[0050] Impeller 22

[0051] First deflector 31

[0052] Main flow section 311

[0053] Sub-guide section 312

[0054] First support plate 311

[0055] First sound-absorbing layer 312

[0056] Second guide vane 32

[0057] Second support plate 321

[0058] Second sound-absorbing layer 322

[0059] Third guide plate 33

[0060] Third support plate 331

[0061] Third sound-absorbing layer 332

[0062] Main airflow channel 41

[0063] Auxiliary airflow channel 42

[0064] 43 Entrance-side acceleration section

[0065] Exit-side acceleration section 44

[0066] Oil collection device 5

[0067] Oil cup 51

[0068] Oil guiding structure 52

[0069] Oil guide plate 521

[0070] Oil guide tube 522

[0071] Mounting beam 523

[0072] Oil guide channel 524

[0073] Oil nozzle 525

[0074] Oil collection box 526 Detailed Implementation

[0075] The present invention will be further illustrated below by way of embodiments, but these embodiments are not intended to limit the scope of the present invention. Based on the description of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0076] like Figure 1 and Figure 2 As shown, this utility model provides a range hood, including a housing 1. The housing 1 includes a smoke collection hood 11 and a fan frame 12 arranged sequentially along the vertical direction (i.e., the direction of smoke extraction). The smoke collection hood 11 has an air inlet 111 at its bottom for drawing in oily fumes. The fan frame 12 is detachably fixed to the upper side of the smoke collection hood 11 by fasteners or other means. A fan 2 is installed inside the fan frame 12. When the fan 2 is started, the negative pressure generated causes the oily fumes to continue to rise and finally be discharged outward from the exhaust port at the top of the fan frame 12. An exhaust hood 122 is provided on the upper side of the fan frame 12. The exhaust hood 122 is detachably fixed to the corresponding exhaust port portion of the fan frame 12 by fasteners, facilitating the replacement of the exhaust hood 122 to adapt to different diameters of oil fume ducts. The fan frame 12 is detachable from the smoke collection hood 11 and other parts of the range hood for easy cleaning and maintenance.

[0077] like Figure 3 As shown, the fan 2 installed in the fan frame 12 specifically includes a volute 21 fixed to the inner wall of the fan frame 12, an impeller 22 installed inside the volute 21, and main air inlets 211 (e.g., on opposite sides of the volute 21 along its axial direction) are respectively provided. Figure 9 (as shown) and secondary air intake 212 (as shown) Figure 7 As shown), the top of the volute 21 is provided with an air outlet 213 (as shown). Figure 12 As shown), the volute 21 is fixedly disposed in the middle of the housing 1 along its axial direction, and divides the interior of the housing 1 into a main airflow channel 41 and a secondary airflow channel 42 along its axial direction. The main airflow channel 41 is connected to the main air inlet 211, and the secondary airflow channel 42 is connected to the secondary air inlet 111 to achieve dual-side zoned air intake. The airflow follows... Figure 3 The direction indicated by the dashed arrow is from the front and rear sides of the volute 21 to enter the interior of the volute 21, thereby improving the efficiency of oil fume collection.

[0078] During operation, the fan 2 creates a negative pressure inside the volute 21, drawing the oily fumes from outside the casing 1 into the fume hood 11 through the air inlet 111. As the oily fumes flow through the bottom area of ​​the volute 21, they are guided to the main airflow channel 41 and the secondary airflow channel 42, and then enter the interior of the volute 21 through the main air inlet 211 and the secondary air inlet 212, respectively. They are then discharged through the air outlet 213 of the volute 21, and finally through the exhaust port of the fan frame 12 and the exhaust hood 122, before being discharged to the external environment.

[0079] Combination Figures 4-6 In some embodiments, a first guide plate 31 extending in a first horizontal direction perpendicular to its axial direction is fixedly connected to the bottom of the volute 21, and a second guide plate 32 is fixedly disposed on the inner wall of the housing 1. The bottom of the second guide plate 32 is located in the area corresponding to the air inlet 111 of the housing 1. The first guide plate 31, the second guide plate 32, the inner wall of the housing 1, and the outer wall of the volute 21 enclose and form an inlet-side acceleration section 43 (e.g., Figure 3 As shown in the diagram, the cross-sectional area of ​​the inlet-side acceleration section 43 gradually decreases along the airflow direction, increasing the airflow velocity and reducing the fluid dead zone. The first guide plate 31 and the second guide plate 32 ensure rapid and smooth airflow within the inlet-side acceleration section 43, suppressing eddy current generation, improving air intake efficiency, and reducing noise. Specifically, the first guide plate 31 extends to both ends of the fan frame 12 along the first horizontal direction and is sealed to the fan frame 12, ensuring airflow along the inlet-side acceleration section 43, preventing backflow of oil within the first guide plate 31, and improving the overall rigidity of the range hood.

[0080] The first guide plate 31 and the second guide plate 32 are arranged opposite to each other. The first guide plate 31 and the second guide plate 32 guide the airflow to flow more smoothly through the inlet-side acceleration section 43, reducing airflow resistance, improving flow efficiency, and increasing air volume at the same fan speed. Furthermore, the first guide plate 31 prevents vortices from forming at the bottom of the volute 21, improving airflow efficiency and reducing noise. The first guide plate 31 can be integrally formed with the volute 21, or fixedly connected to the volute 21 by welding or fasteners. The second guide plate 32 is fixed to the inner wall of the housing 1 by fasteners or snap-fits, improving connection stability.

[0081] like Figure 7 and Figure 8As shown, in some embodiments, the first guide plate 31 includes a main flow section 31a and a secondary flow section 31b fixedly connected to each other. The main flow section 31a and the secondary flow section 31b extend upward and outward in the vertical direction, respectively, and are respectively disposed opposite to the second guide plate 32 in the main airflow channel 41 and the secondary airflow channel 42. In one embodiment, both the main flow section 31a and the secondary flow section 31b are flat, and the included angle between the main flow section 31a and the secondary flow section 31b is 75~85°. For example, the included angle between the main flow section 31a and the secondary flow section 31b is 80°. In this embodiment, the projected height H of the first guide plate 31 in the vertical direction satisfies the following relationship: 100≤H≤105mm, thereby ensuring that the height of the volute 21 meets the requirements while increasing the airflow velocity of the inlet-side acceleration section 43.

[0082] like Figure 3 As shown, the number of second guide plates 32 is at least two, wherein at least one second guide plate 32 is fixed to the area of ​​the corresponding main airflow channel 41 on the inner wall of the housing 1, and the other second guide plate 32 is fixed to the area of ​​the corresponding secondary airflow channel 42 on the inner wall of the housing 1, thereby forming independent inlet-side acceleration sections 43 in the main airflow channel 41 and the secondary airflow channel 42, respectively, to further improve gas flow efficiency and prevent the generation of vortices, thereby reducing noise.

[0083] In one embodiment, a third guide plate 33 is provided in the area corresponding to the main air inlet 211 and the secondary air inlet 212 on the inner wall of the housing 1. The third guide plate 33, the inner wall of the housing 1 and the outer wall of the volute 21 enclose the outlet side acceleration section 44. The flow cross-sectional area of ​​the outlet side acceleration section 44 gradually decreases along the airflow direction so that the airflow in the housing 1 is discharged quickly, and eddies are prevented and noise is reduced.

[0084] In some embodiments, at least one of the first guide plate 31, the second guide plate 32, and the third guide plate 33 includes a support plate and a sound-absorbing layer adhered and fixed to one side or opposite sides of the support plate. Specifically, the sound-absorbing layer is made of sound-absorbing cotton or sound-absorbing foam, and is fixed to the surface of the support plate by means of fastener connection, adhesive bonding, or snap-fit. The support plate has multiple sound-absorbing holes to improve noise reduction performance.

[0085] Combination Figure 4 and Figure 7In one embodiment, the first guide plate 31 includes a first support plate 311 and a first sound-absorbing layer 312, with the first sound-absorbing layer 312 sandwiched between the first support plate 311 and the volute 21. The second guide plate 32 includes a second support plate 321 and a second sound-absorbing layer 322, with the second sound-absorbing layer 322 sandwiched between the second support plate 321 and the housing 1. The third guide plate 33 includes a third support plate 331 and a third sound-absorbing layer 332 fitted to the rear side of the third support plate 331. All the aforementioned sound-absorbing layers are located on the rear side of the support plate. Through the sound-absorbing holes on the support plate, airflow noise can more easily enter the sound-absorbing layer on its rear side, thereby improving the noise reduction performance of the range hood and enhancing connection reliability. Figure 8 As shown, the projection of the first sound-absorbing layer 312 along the axial direction of the volute 21 is a "U"-shaped covering structure. While absorbing the airflow noise inside the volute 21, it can also absorb the airflow noise of the inlet-side acceleration section 43, reducing the number of parts and assembly processes, lowering manufacturing costs, and making the structure compact.

[0086] like Figure 9 and Figure 10 As shown, in some embodiments, an oil cup 51 is provided at the bottom of the housing 1. The oil cup 51 is located below the first guide plate 31 and is in fluid communication with the first guide plate 31 through the oil guiding structure 52.

[0087] Furthermore, such as Figure 7 and Figure 8 As shown, the oil guiding structure 52 includes an oil guiding plate 521 disposed at the bottom of the first guide plate 31. The oil guiding plate 521 is arranged between the main flow section 31a and the secondary flow section 31b. The oil guiding plate 521 extends downward from its middle part along a first horizontal direction to its downstream end, so that the downstream end of the oil guiding plate 521 is lower than its middle part in the vertical direction. In this embodiment, the first sound-absorbing layer 312 is located above the first guide plate 31 and there is a preset distance between them. This distance forms an oil channel for guiding oil droplets seeping from inside the volute 21 through the first sound-absorbing layer 312 and sliding down to the surface of the oil guiding plate 521, and then along... Figure 7 The oil flows in the direction indicated by the middle arrow, converging into the oil cup 51 through the oil guiding structure 52. Alternatively, after the e-liquid vapor is drawn into the smoke collection hood 11, the oil in the e-liquid vapor adheres to the first guide plate 31 and the oil guiding plate 521 located in the middle. The adhered oil forms oil droplets, which slide down onto the surface of the oil guiding plate 521 and similarly flow along... Figure 7 The oil flows in the direction indicated by the middle arrow and flows into the oil cup 51 through the oil guide structure 52.

[0088] Combination Figure 10 and 13The oil guiding structure 52 also includes an oil guiding pipe 522, which is arranged on the side of the range hood to avoid occupying the oil fume space in the middle of the range hood. The upper end of the oil guiding pipe 522 is connected to the downstream end of the oil guiding plate 521, and the lower end of the oil guiding pipe 522 extends to the top or inside of the oil cup 51 to ensure that the oil drips into the oil cup 51 along a preset path.

[0089] In one embodiment, a mounting beam 523 extending axially along the volute 21 is fixedly disposed inside the housing 1, such as... Figure 10 and Figure 11 As shown, the fan frame 12 is fixedly connected to the smoke hood 11 via the mounting beam 523. The oil guiding structure 52 also includes an oil guiding channel 524, which is located in the downstream region of the corresponding oil guiding plate 521 of the mounting beam 523. The oil guiding pipe 522 is in fluid communication with the downstream end of the oil guiding plate 521 through the oil guiding channel 524. In this embodiment, the oil guiding channel 524 extends along a preset oil guiding path, and the oil guiding channel 524 is provided with a guide portion along the oil guiding path in a direction away from the oil guiding plate 521. The guide portion is a stepped structure arranged in the vertical direction, or the guide surface is an inclined surface extending at an angle relative to the horizontal direction. The guide portion guides the flow direction of the oil in the oil guiding channel 524.

[0090] like Figure 12 and Figure 13 As shown, the oil guiding structure 52 also includes an oil inlet 525, which is approximately V-shaped and located at the upper or middle part of the oil guiding channel 524. The oil inlet 525 allows the oil on the surface of the oil guiding plate 521 to flow more smoothly into the oil guiding channel 524 of the mounting beam 523. Optionally, the bottom surface of the oil inlet 525 has rounded corners, allowing airflow to flow smoothly over its bottom surface and reducing airflow resistance. Furthermore, the oil inlet 525 is located in the area corresponding to the oil guiding channel 524 of the mounting beam 523, and below the oil guiding plate 521. The vertical projection of the oil inlet 525 is at least partially within the projection range of the downstream end of the oil guiding plate 521, preventing backflow of oil under the action of airflow and ensuring that the oil flows along the preset oil guiding path.

[0091] like Figure 10As shown, in one embodiment, the oil guiding structure 52 further includes an oil collection box 526. The oil collection box 526 is fixed to the area of ​​the corresponding oil guiding channel 524 of the mounting beam 523. The first end of the oil guiding pipe 522 is fixedly connected to the bottom of the oil collection box 526. The oil collection box 526 is at least partially located below the oil guiding plate 521. Under the action of gravity, the oil on the surface of the oil guiding plate 521 flows into the oil collection box 526 through the oil guiding channel 524 and flows to the oil cup 51 through the oil guiding pipe 522 fixedly connected to the bottom of the oil collection box 526. Under high oil fume conditions, because the oil condenses quickly and the flow rate is large, the oil collection box 526 can temporarily store the oil, preventing oil from overflowing due to instantaneous flow overload in the oil guiding channel 524. In addition, the first end of the oil guide tube 522 and the oil collection box 526 can be fixedly connected by at least one of the following methods: snap-fit, threaded connection and sealant bonding. Compared with fixing the first end of the oil guide tube 522 to the oil guide channel 524, the convenience and reliability of the connection are improved, and maintenance and cleaning are also easier.

[0092] In this embodiment, the range hood can also be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the range hood to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience.

[0093] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A range hood, characterized in that, It includes a housing with an air inlet, and a fan with a volute is disposed inside the housing. The bottom of the volute is fixedly connected to a first guide plate extending in a first horizontal direction perpendicular to its axial direction. A second guide plate is fixedly provided on the inner wall of the housing, and the bottom of the second guide plate is located in the area of ​​the housing corresponding to the air inlet; The first guide plate, the second guide plate, the inner wall of the housing, and the outer wall of the volute enclose the inlet-side acceleration section, and the flow cross-sectional area of ​​the inlet-side acceleration section gradually decreases along the airflow direction.

2. The range hood as described in claim 1, characterized in that, The volute is fixedly disposed in the middle of the housing along its axial direction, and the volute divides the interior of the housing into a main airflow channel and a secondary airflow channel along its axial direction. The number of the second guide vanes is at least two, wherein at least one second guide vane is fixed to the area of ​​the inner wall of the housing corresponding to the main airflow channel, and the other second guide vane is fixedly disposed in the area of ​​the inner wall of the housing corresponding to the secondary airflow channel.

3. The range hood as described in claim 2, characterized in that, The volute has a main air inlet and a secondary air inlet on opposite sides of its axial direction, and a third guide plate is provided on the inner wall of the volute corresponding to the main air inlet and the secondary air inlet. The third guide plate, the inner wall of the housing, and the outer wall of the volute form an outlet-side acceleration section, and the flow cross-sectional area of ​​the outlet-side acceleration section gradually decreases along the airflow direction.

4. The range hood as described in claim 3, characterized in that, At least one of the first guide plate, the second guide plate, and the third guide plate includes a support plate and a sound-absorbing layer that is attached and fixed to one side or opposite sides of the support plate.

5. The range hood as described in claim 2, characterized in that, The first guide plate includes a main flow section and a secondary flow section fixedly connected to each other. The main flow section and the secondary flow section are respectively inclined upward and outward in the vertical direction, and are respectively arranged opposite to the second guide plate in the main airflow channel and the secondary airflow channel.

6. The range hood as described in claim 5, characterized in that, An oil cup is provided at the bottom of the housing. The oil cup is located below the first guide plate and is in fluid communication with the first guide plate through an oil guiding structure. The oil guiding structure includes an oil guiding plate, which is disposed at the bottom of the first guide plate and connected between the main flow section and the secondary flow section. The oil guiding plate extends downward from its middle part along the first horizontal direction to its downstream end.

7. The range hood as described in claim 6, characterized in that, The oil guiding structure also includes an oil guiding pipe, the first end of which is connected to the downstream end of the oil guiding plate, and the second end of which extends to the top or inside of the oil cup.

8. The range hood as described in claim 7, characterized in that, A mounting beam extending axially along the volute is fixedly disposed inside the housing. The oil guiding structure also includes an oil guiding channel, which is located in the region of the mounting beam corresponding to the downstream end of the oil guiding plate. The oil guiding pipe is in fluid communication with the downstream end of the oil guiding plate through the oil guiding channel.

9. The range hood as described in claim 8, characterized in that, The oil guiding structure also includes an oil inlet, which is located in the area of ​​the mounting beam corresponding to the oil guiding channel and below the oil guiding plate. The projection of the oil inlet in the vertical direction is at least partially located within the projection range of the downstream end of the oil guiding plate.

10. The range hood as described in claim 9, characterized in that, The oil guiding structure also includes an oil collection box, which is fixed to the area of ​​the mounting beam corresponding to the oil guiding channel. The first end of the oil guiding pipe is fixedly connected to the bottom of the oil collection box, and the oil collection box is at least partially located below the oil guiding plate.

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