Smoke collecting assembly and range hood

Abstract

The invention discloses a smoke collecting assembly and a range hood, and belongs to the technical field of electrical equipment, the smoke collecting assembly is applied to the range hood, the smoke collecting assembly comprises a smoke collecting hood and a rectifying part, the smoke collecting hood is provided with a smoke collecting cavity, an upper smoke inlet, a lower smoke inlet and a communicating port, and the upper smoke inlet, the lower smoke inlet and the communicating port all communicate with the smoke collecting cavity; the upper smoke inlet is higher than the lower smoke inlet, and the communicating port is used for being communicated with a rack assembly of the extractor hood; the rectifying part is arranged in the smoke collecting cavity and divides the smoke collecting cavity into an auxiliary air duct and a main air duct, the auxiliary air duct communicates with the upper smoke inlet and the communicating opening, and the main air duct communicates with the lower smoke inlet and the communicating opening. According to the embodiment, oil smoke sucked by the upper smoke inlet and the lower smoke inlet can be effectively guided to flow according to respective preset paths, so that the possibility that oil smoke airflow generates vortex in the smoke collecting cavity is reduced.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and in particular to a smoke collection assembly and a range hood. Background Technology

[0002] As modern families increasingly pursue a higher quality of life, range hoods have become an indispensable piece of equipment in the kitchen. The main function of a range hood is to exhaust cooking fumes, odors, and steam generated during cooking outdoors, maintaining a clean and hygienic kitchen environment. The smoke collection assembly is the core component of a range hood, and its main function is to collect and guide cooking fumes into the machine for processing. In existing range hood technology, to expand the smoke extraction range and improve extraction efficiency, the smoke collection assembly is designed with both upper and lower smoke inlets to accommodate the fumes generated by different cooking methods. However, smoke collection assemblies with upper and lower smoke inlets lack diversion and guidance systems, leading to interference between the smoke drawn in through the upper and lower inlets, resulting in poor smoke flow. This mutual interference can also cause eddies in the smoke inside the smoke collection hood, affecting smoke extraction efficiency and increasing noise. Summary of the Invention

[0003] This application provides a smoke collection assembly and a range hood that can reduce airflow interference between the upper and lower smoke inlets. In a first aspect, embodiments of this application provide a smoke collection assembly for use in a range hood, the smoke collection assembly comprising: A smoke collection hood includes a smoke collection chamber, an upper smoke inlet, a lower smoke inlet, and a connecting port. The upper smoke inlet, the lower smoke inlet, and the connecting port are all connected to the smoke collection chamber. The upper smoke inlet is higher than the lower smoke inlet. The connecting port is used to connect to the frame assembly of the range hood. A rectifier is disposed in the smoke collection chamber and divides the smoke collection chamber into an auxiliary air duct and a main air duct. The auxiliary air duct connects the upper smoke inlet and the connecting port, and the main air duct connects the lower smoke inlet and the connecting port. In some embodiments, the upper smoke inlet includes an upper left smoke inlet and an upper right smoke inlet; the number of rectifiers is two, and the two rectifiers are respectively: A left-side rectifier is disposed within the smoke collection chamber and defines a left-side auxiliary air duct between itself and the smoke collection hood. The left-side auxiliary air duct connects the upper left smoke inlet to the connecting port. A right-side rectifier and a left-side rectifier are respectively disposed in the smoke collection chamber along the left and right directions. A right-side auxiliary air duct is defined between the right-side rectifier and the smoke collection hood. The right-side auxiliary air duct connects the upper right smoke inlet and the connecting port. The main air duct is defined by the left rectifier, the right rectifier, and the smoke hood. The main air duct connects the lower smoke inlet and the connecting port. The auxiliary air duct includes the left auxiliary air duct and the right auxiliary air duct. In some embodiments, the smoke hood includes a front panel, a left side panel, a back panel, and a right side panel connected in sequence, with the left side panel and the right side panel arranged opposite each other from left to right, and the front panel and the back panel arranged opposite each other from front to back. The front panel, the left side panel, the back panel, and the right side panel form the smoke collection chamber; The left-side rectifier, part of the front panel, part of the left-side plate, and part of the back panel constitute the left-side auxiliary air duct; The right-side rectifier, part of the front panel, part of the right-side plate, and part of the back panel constitute the right-side auxiliary air duct; The upper left smoke inlet is located at the upper left corner of the left side panel and / or the front panel, and the upper right smoke inlet is located at the upper right corner of the right side panel and / or the front panel. In some embodiments, both the upper left smoke inlet and the upper right smoke inlet extend horizontally. In some embodiments, the smoke hood further includes a left smoke inlet and a right smoke inlet, the left smoke inlet being located on the left side panel or the left side region of the front panel, and the right smoke inlet being located on the right side panel or the right side region of the front panel; Along the vertical direction, the left smoke inlet extends between the upper left smoke inlet and the lower smoke inlet, and the right smoke inlet extends between the upper right smoke inlet and the lower smoke inlet; the left auxiliary air duct is also connected to the left smoke inlet; the right auxiliary air duct is also connected to the right smoke inlet. In some embodiments, the left smoke inlet and the upper left smoke inlet are both located on the front panel, and the left smoke inlet and the upper left smoke inlet are connected; the right smoke inlet and the upper right smoke inlet are both located on the front panel, and the right smoke inlet and the upper right smoke inlet are connected. In some embodiments, the connection between the left smoke inlet and the upper left smoke inlet is located at the upper left corner of the front panel, and the connection between the right smoke inlet and the upper right smoke inlet is located at the upper right corner of the front panel. In some embodiments, the left smoke inlet is connected to the lower smoke inlet, and the right smoke inlet is connected to the lower smoke inlet. In some embodiments, the bottom end of the left auxiliary air duct is separated from the main air duct, and the bottom end of the right auxiliary air duct is separated from the main air duct; or The bottom end of the left auxiliary air duct is connected to the main air duct, and the bottom end of the right auxiliary air duct is connected to the main air duct. In some embodiments, the left rectifier includes a left rectifier section and a left guide section that are connected to each other and arranged at an angle. The left rectifier section extends upward at an angle from left to right, and the left guide section extends upward at an angle from left to right toward the communication port from the end of the left rectifier section away from the left side plate. The right-side rectifier includes a right-side rectifier section and a right-side guide section that are connected to each other and arranged at an angle. The right-side rectifier section extends upward at an angle from right to left, and the right-side guide section extends upward at an angle from right to left from the end of the right-side rectifier section away from the right-side plate and toward the communication port. In some of these embodiments, the first distance D1 between the left rectifier section and the right rectifier section in the left-right direction gradually decreases along the bottom-up direction; Along the bottom-up direction, the second distance D2 between the left guide section and the right guide section in the left-right direction gradually decreases, and the rate of decrease of the first distance D1 is greater than the rate of decrease of the second distance D2. In some embodiments, the left rectifier section is sealed to both the front panel and the back panel, and the left end of the left rectifier section is sealed to or spaced apart from the left side panel; the left guide section is sealed to both the front panel and the back panel. The right-side rectifier section is sealed to both the front panel and the back panel, and the right end of the right-side rectifier section is sealed to or spaced apart from the right-side panel; the right-side guide section is sealed to both the front panel and the back panel. In some embodiments, the left rectifier section, the left guide section, the right rectifier section, and the right guide section are each a flat plate or an arc-shaped plate. In some embodiments, the left rectifier further includes a left flow stabilizer section, which is connected to one end of the left guide section away from the left rectifier section, and the left flow stabilizer section extends from bottom to top toward the communication port; The right-side rectifier also includes a right-side flow stabilizing section, which is connected to the end of the right-side guide section away from the right-side rectifier section, and extends from bottom to top toward the communication port. In some of these embodiments, the left-side rectifier satisfies one of the following conditions: The left rectifier section and the left guide section are arranged with an arc transition; The left-side guide section and the left-side stabilizing section are arranged with an arc transition; Along the vertical direction, the left-side stabilizing section has a first height H1, where H1 ≥ 5 mm; and / or, The right-side rectifier meets one of the following conditions: The right-side rectifier section and the right-side guide section are arranged with an arc transition; The right-side guide section and the right-side stabilizing section are arranged with an arc transition; Along the vertical direction, the right-side stabilizing section has a second height H2, where H2 ≥ 5 mm. In some embodiments, the rectifier is at least partially rotatable relative to the smoke hood, such that at least one of the auxiliary duct and the main duct is in communication with the connection port. In some embodiments, the rectifier includes a rectifier section and a guide section that are rotatably connected to each other, so that the guide section can rotate relative to the smoke hood and isolate or connect the auxiliary air duct and the communication port. In some embodiments, the smoke collection assembly further includes a lower opening / closing member, which is movably connected to the smoke collection hood to open or close the lower smoke inlet; or, The smoke collection hood includes an upper cover and a lifting cover. The lower smoke inlet is located in the lifting cover. The lifting cover can be raised and lowered relative to the upper cover to open or close the lower smoke inlet. In some of these embodiments, the smoke collection assembly has an upper single-suction mode, a lower single-suction mode, and an upper and lower dual-suction mode; When the smoke collection assembly is in the upper single suction mode, the guide section rotates relative to the smoke collection hood to the first guiding position to guide the auxiliary air duct and the connecting port. The lower opening and closing member closes the lower smoke inlet or the lifting shell moves upward to close the lower smoke inlet. When the smoke collection assembly is in the single-suction mode, the guide section rotates relative to the smoke collection hood to the closed position to close the auxiliary air duct and the connecting port, and the lower opening and closing member opens the lower smoke inlet or the lifting shell moves downward to open the lower smoke inlet; When the smoke collection assembly is in the upper and lower dual-suction mode, the guide section rotates relative to the smoke collection hood to the second open position to connect the auxiliary air duct and the communication port. The lower opening and closing member opens the lower smoke inlet or the lifting shell moves downward to open the lower smoke inlet. In the rotation direction of the guide section, the second open position is located between the first open position and the closed position. In some embodiments, the angle between the rectifying section and the guiding section is α; When the guide section is in the first conductive position, α≥180; When the guide section is in the closed position, α ≤ 90°; When the guide section is in the second conduction position, 90° < α < 180°. In some embodiments, the upper smoke inlet includes an upper left smoke inlet and an upper right smoke inlet; the number of rectifiers is two, and the two rectifiers are respectively: A left-side rectifier is disposed within the smoke collection chamber and defines a left-side auxiliary air duct between itself and the smoke collection hood. The left-side auxiliary air duct connects the upper left smoke inlet to the connecting port. A right-side rectifier and a left-side rectifier are respectively disposed in the smoke collection chamber along the left and right directions. A right-side auxiliary air duct is defined between the right-side rectifier and the smoke collection hood. The right-side auxiliary air duct connects the upper right smoke inlet and the connecting port. The main air duct is defined by the left rectifier, the right rectifier, and the smoke hood, and the main air duct connects the lower smoke inlet and the connecting port; the auxiliary air duct includes the left auxiliary air duct and the right auxiliary air duct; The left rectifier includes a left rectifier section and a left guide section that are rotatably connected to each other; the right rectifier includes a right rectifier section and a right guide section that are rotatably connected to each other; the left rectifier section includes the left rectifier section and the right rectifier section; the guide section includes the left guide section and the right guide section. In the closed position, the second distance D2 between the left guide section and the right guide section in the left-right direction gradually decreases from top to bottom. In some embodiments, the left rectifier further includes a left flow stabilizer section connected to one end of the left guide section opposite to the left rectifier section; The right-side rectifier also includes a right-side flow stabilizing section, which is connected to the end of the right-side guide section opposite to the right-side rectifier section. In the closed position, the third distance D3 between the left and right flow stabilizing sections gradually decreases in the left-right direction along the top-to-bottom direction. In some of these embodiments, it also includes: The upper opening and closing component is movably connected to the smoke collection hood to open or close the upper smoke inlet; When the smoke collection assembly is in the upper single-suction mode or the upper and lower double-suction mode, the upper opening and closing component opens the upper smoke inlet; when the smoke collection assembly is in the lower single-suction mode, the upper opening and closing component closes the upper smoke inlet. In some embodiments, the smoke hood includes a front panel, the upper smoke inlet is disposed on the front panel, and the upper smoke inlet extends horizontally to form an elongated shape; The number of rectifiers is one, and the rectifier is a long strip-shaped rectifier extending from left to right. The long strip-shaped rectifier divides the smoke collection chamber into the main air duct and the auxiliary air duct in the front-to-back direction. The auxiliary air duct is the upper front space of the smoke collection chamber. Secondly, embodiments of this application provide a range hood, comprising: Rack components; and The smoke collection assembly as described in any of the above embodiments is disposed below the frame assembly, and the communication port connects the smoke collection chamber and the frame assembly; In the vertical direction of the range hood, the projection of the rectifier overlaps with the projection of the connecting port. In some embodiments, the upper smoke inlet includes an upper left smoke inlet and an upper right smoke inlet; the number of rectifiers is two, and the two rectifiers are respectively: A left-side rectifier is disposed within the smoke collection chamber and defines a left-side auxiliary air duct between itself and the smoke collection hood. The left-side auxiliary air duct connects the upper left smoke inlet to the connecting port. A right-side rectifier and a left-side rectifier are respectively disposed in the smoke collection chamber along the left and right directions. A right-side auxiliary air duct is defined between the right-side rectifier and the smoke collection hood. The right-side auxiliary air duct connects the upper right smoke inlet and the connecting port. The main air duct is defined by the left rectifier, the right rectifier and the smoke hood. The main air duct connects the lower smoke inlet and the connecting port. The auxiliary air duct includes the left auxiliary air duct and the right auxiliary air duct. In the left-right direction, the minimum distance between the left rectifier and the right rectifier is the fourth distance D4, and the left and right walls of the connecting port have a fifth distance D5, where D4 < D5. In some embodiments, the rectifier includes: First rectifier board; and The second rectifier plate is connected to the first rectifier plate to jointly form a sound-absorbing cavity; The first rectifier plate and / or the second rectifier plate have silencing holes that communicate with the silencing cavity. In some embodiments, the rectifier further includes: A noise reduction component is disposed within the noise reduction cavity. In some embodiments, the rack assembly includes: frame; A connecting flange is attached to the bottom end of the frame and together with the frame forms the fan cavity, the fan cavity communicating with the connecting port; and A fan is located inside the fan cavity and above the connecting flange; In the vertical direction of the range hood, the projection of the rectifier and the projection of the connecting flange partially overlap inside the communication port, so that oil droplets from the connecting flange drip through the communication port onto the upper surface of the rectifier. In some embodiments, the upper smoke inlet includes an upper left smoke inlet and an upper right smoke inlet; the number of rectifiers is two, and the two rectifiers are respectively: A left-side rectifier is disposed within the smoke collection chamber and defines a left-side auxiliary air duct between itself and the smoke collection hood. The left-side auxiliary air duct connects the upper left smoke inlet to the connecting port. A right-side rectifier and a left-side rectifier are respectively disposed in the smoke collection chamber along the left and right directions. A right-side auxiliary air duct is defined between the right-side rectifier and the smoke collection hood. The right-side auxiliary air duct connects the upper right smoke inlet and the connecting port. The main air duct is defined by the left rectifier, the right rectifier and the smoke hood. The main air duct connects the lower smoke inlet and the connecting port. The auxiliary air duct includes the left auxiliary air duct and the right auxiliary air duct. Wherein, the left rectifier is inclined downward from right to left and inclined downward from front to back; and / or, the right rectifier is inclined downward from left to right and inclined downward from front to back. In some embodiments, the smoke hood includes a left side panel and a right side panel, which are arranged opposite each other from left to right. The left rectifier includes a left rectifier section and a left guide section that are connected to each other and arranged at an angle. The left rectifier section extends upward from left to right at an angle, and the left guide section extends upward from left to right from the end of the left rectifier section away from the left side plate and toward the communication port. The right-side rectifier includes a right-side rectifier section and a right-side guide section that are connected to each other and arranged at an angle. The right-side rectifier section extends upward from right to left at an angle, and the right-side guide section extends upward from right to left from the end of the right-side rectifier section away from the right-side plate and toward the communication port. The projections of the left and right guide sections along the vertical direction both fall at least partially into the connecting opening. In some embodiments, the left rectifier further includes a left flow stabilizer section, which is connected to one end of the left guide section away from the left rectifier section, and the left flow stabilizer section extends from bottom to top toward the communication port; The right-side rectifier also includes a right-side flow stabilizing section, which is connected to the end of the right-side guide section away from the right-side rectifier section, and the right-side flow stabilizing section extends from bottom to top toward the communication port. The projections of the left and right flow-stabilizing sections along the vertical direction both fall into the connecting port. In some embodiments, along the left-right direction, there is a sixth distance D6 between the left-side stabilizing section and the left wall of the connecting port, where 25mm ≤ D6 ≤ 35mm; and / or, Along the left-right direction, there is a seventh distance D7 between the right-side stabilizing section and the right wall of the connecting port, where 25mm≤D7≤35mm. In some embodiments, the connecting flange has a first oil guide groove located within the smoke collection chamber, the first oil guide groove extending in a left-right direction to guide oil droplets from the connecting flange to the left rectifier and the right rectifier. In some embodiments, the connecting flange includes: An oil receiving base plate is located below the fan and is inclined downwards from front to back; A surrounding panel, connected to the frame and the smoke collection hood, and surrounding the periphery of the oil receiving base plate, wherein a guide opening is formed between the rear sidewall of the surrounding panel and the rear sidewall of the oil receiving base plate, the guide opening being inserted into the communication opening to communicate with the smoke collection chamber; and, An oil guide component is connected to the oil receiving base plate and located within the guide port, and has the first oil guide groove. In some embodiments, the oil guide includes: A connecting plate, connected to the rear sidewall of the oil receiving base plate, and extending downwards from the oil receiving base plate into the smoke collection chamber; and A slotted plate is connected to the bottom end of the connecting plate and has the first oil guide groove. In some of the embodiments, the first oil guide groove has a bottom wall along the left-right direction, and the bottom wall is an arc-shaped bottom wall that is higher in the middle and lower at both ends. In some embodiments, the bottom surface of the slotted plate is an arc-shaped bottom surface that is higher in the middle and lower at both ends along the left-right direction. In some embodiments, the left edge region of the oil receiving base plate also has a left-side oil guide groove extending in the front-rear direction to guide oil droplets from the connecting flange to the left-side rectifier; and / or, The right edge region of the oil receiving base plate also has a right-side oil guide groove, which extends in the front-back direction to guide the oil droplets from the connecting flange to the right-side rectifier. In some embodiments, the front edge region of the oil receiving base plate also has a front oil guide groove, which extends in the left-right direction and communicates with the left oil guide groove and / or the right oil guide groove. An embodiment of this application discloses a smoke collection assembly and a range hood. A rectifier is disposed within the smoke collection chamber, dividing the chamber into an auxiliary duct and a main duct. The auxiliary duct connects the upper smoke inlet and the connecting port, providing a smooth flow path for the fumes drawn in through the upper smoke inlet and preventing collisions and eddies between the fumes drawn in through the upper and lower smoke inlets within the smoke collection chamber. The main duct connects the lower smoke inlet and the connecting port, providing a smooth flow path for the fumes drawn in through the lower smoke inlet and guiding them smoothly into the frame assembly. Therefore, the rectifier effectively guides the fumes drawn in through the upper and / or lower smoke inlets along their respective preset paths, thereby reducing turbulence and eddies in the smoke collection chamber. Furthermore, the rectifier guides the smooth flow of cooking fumes, preventing eddies or collisions within the fume collection chamber and thus reducing noise. In addition, the rectifier optimizes the path of the flowing fumes, reducing friction between the inhaled fumes and the walls of the collection chamber, further reducing noise and providing a comfortable cooking environment for users. Furthermore, by setting up a rectifier to divide the smoke collection chamber into an auxiliary air duct and a main air duct, it is possible to avoid the oil fumes drawn in from the upper smoke inlet and the lower smoke inlet from interfering with each other, reducing wind resistance, improving the smoke extraction efficiency of the range hood, reducing the energy consumption of the range hood, and allowing the oil fumes to enter the fan of the frame assembly more smoothly for exhaust treatment, thereby reducing the concentration of oil fumes in the kitchen. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort. Figure 1 This is a schematic diagram of the structure of a range hood provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of a range hood in single-suction mode according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a range hood in single suction mode according to an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a range hood in the upper and lower dual-suction mode according to an embodiment of this application; Figure 5 for Figure 4 The diagram shows the airflow direction of the main air duct and auxiliary air duct of the range hood in the dual suction mode. Figure 6 This is a cross-sectional view of a range hood in single-suction mode provided in related technologies (without rectifiers). Figure 7 This is a cross-sectional view of a range hood in dual-suction mode (without rectifiers) provided in related technologies. Figure 8 This is another cross-sectional view of the range hood in the dual-suction mode provided in the related technology (without rectifiers); Figure 9 This is a schematic diagram of the structure of a range hood provided in another embodiment of this application; Figure 10 This is a schematic diagram of the structure of a range hood provided in another embodiment of this application; Figure 11 This is a schematic diagram of the structure of a range hood provided in another embodiment of this application; Figure 12 for Figure 4 The diagram shows a cross-sectional view of the range hood in dual-suction mode. Figure 13 for Figure 4 Another cross-sectional view of the range hood in dual-suction mode is shown. Figure 14 This is a schematic diagram of the structure of a rectifier provided in one embodiment of this application; Figure 15 This is a schematic diagram of the structure of a rectifier provided in another embodiment of this application; Figure 16 This is a cross-sectional view of a range hood in single-suction mode according to an embodiment of this application. Figure 17 for Figure 16 The diagram shows another cross-sectional view of the range hood in single-suction mode. Figure 18 This is a cross-sectional view of a range hood in single-suction mode according to an embodiment of this application. Figure 19 This is a cross-sectional view of a range hood in dual-suction mode according to an embodiment of this application. Figure 20 for Figure 19 Another cross-sectional view of the range hood in dual-suction mode is shown. Figure 21 for Figure 18 The diagram shown is another cross-sectional view of the range hood in single suction mode; Figure 22 This is a schematic diagram of oil flow in the dual-suction mode of a range hood provided in related technologies (without rectifiers). Figure 23 for Figure 4 The diagram shown illustrates the oil flow direction of the range hood in its dual-suction mode. Figure 24 for Figure 23 A magnified view of a section at point A in the middle; Figure 25 for Figure 4 The diagram shown illustrates another oil flow direction of the range hood in its dual-suction mode. Figure 26 for Figure 25 A magnified view of a section at point B in the middle; Figure 27 This is a schematic diagram of the structure of a connecting flange provided in one embodiment of this application; Figure 28 for Figure 27 Another structural schematic diagram of the connecting flange shown; Figure 29 for Figure 27 The diagram shows a cross-sectional view of the connecting flange. Explanation of icon numbers: 1. Range hood; 100. Smoke collection assembly; 11. Smoke hood; 11a. Smoke collection chamber; 111a. Auxiliary air duct; 1111a. Left auxiliary air duct; 1112a. Right auxiliary air duct; 112a. Main air duct; 11b. Upper smoke inlet; 111b. Upper left smoke inlet; 112b. Upper right smoke inlet; 11c. Lower smoke inlet; 11d. Connecting opening; 111d. Left opening wall; 112d. Right opening wall; 11e. Left smoke inlet; 11f. Right smoke inlet; 111. Upper cover; 1111. Front panel; 1112. Back panel; 1113. Left side panel; 1114. Right side panel; 1115. Top panel; 112. Lifting shell; 1121. Lifting frame ; 1122, Air inlet grille; 113, Guide vane; 12, Rectifier; 121, Rectifier section; 122, Guide section; 123, Stabilizing section; 12a, Left rectifier; 121a, Left rectifier section; 1211a, First fold; 122a, Left guide section; 1221a, Third fold; 123a, Left stabilizing section; 124a, Left rotating shaft; 1231a, Fifth fold; 12b, Right rectifier; 121b, Right rectifier section; 122b, Right guide section; 123b, Right stabilizing section; 124b, Right rotating shaft; 13, Upper opening / closing component; 14, Glass baffle; 15, Push rod motor; 16, Oil cup; 200. Frame assembly; 21. Frame; 21a. Fan cavity; 211. Left side mounting plate; 212. Right side mounting plate; 213. Top mounting plate; 22. Connecting flange; 22a. Through port; 221. Oil receiving base plate; 222. Enclosure plate; 223. Oil guide component; 2231. Connecting plate; 2232. Slotted plate; 2232a. First oil guide groove; 23. Fan; 24. Top oil guide structure; 241. Left side oil guide structure; 242. Right side oil guide structure; 300. Check valve assembly. The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Firstly, please refer to Figure 1 and Figure 5 This application provides a smoke collection assembly 100 for use in a range hood 1. The range hood 1 is used in kitchens and is typically installed near the stovetop to better capture the fumes and steam generated during cooking. The range hood 1 includes a frame assembly 200 with a fan chamber 21a. A fan 23 is installed within the fan chamber 21a to generate negative pressure suction. The smoke collection assembly 100 is the core component of the range hood 1, and its main function is to collect and guide the fumes, delivering them to the fan 23 for exhaust. like Figure 2 , Figure 3 and Figure 5 As shown, specifically, the smoke collection assembly 100 includes a smoke collection hood 11, which may be cuboid in shape. The cuboid shape of the smoke collection hood 11 is regular in design and easy to clean and maintain. The smoke collection hood 11 may be made of stainless steel or aluminum alloy, possessing good heat resistance and corrosion resistance. The smoke collection hood 11 has a smoke collection chamber 11a, an upper smoke inlet 11b, a lower smoke inlet 11c, and a connecting port 11d. The upper smoke inlet 11b, the lower smoke inlet 11c, and the connecting port 11d are all connected to the smoke collection chamber 11a. Understandably, the upper smoke inlet 11b and the lower smoke inlet 11c can be opened or closed independently. The lower smoke inlet 11c may extend along the left-right direction AA on the smoke collection hood 11, forming a long strip. The smoke collection chamber 11a serves as a temporary storage space for cooking fumes, accommodating and guiding their flow. Its spacious interior can hold a large amount of fumes, preventing them from escaping. The connecting port 11d connects to the frame assembly 200 of the range hood 1, ensuring that fumes can smoothly enter the frame assembly 200 for exhaust. The upper smoke inlet 11b and lower smoke inlet 11c are located at the upper and lower parts of the smoke collection hood 11, respectively, with the upper smoke inlet 11b higher than the lower smoke inlet 11c. This arrangement allows the smoke collection assembly 100 to have a larger smoke-gathering area, improving the smoke extraction effect of the range hood 1. Furthermore, the upper and lower smoke inlets 11b and 11c effectively capture fumes generated by different cooking methods. The upper smoke inlet 11b is suitable for cooking methods where fumes rise, such as steaming and boiling; while the lower smoke inlet 11c is suitable for cooking methods where fumes sink, such as frying and stir-frying. During actual cooking, the fumes produced, whether rising or sinking, can be effectively captured by the upper smoke inlet 11b and / or the lower smoke inlet 11c, and enter the smoke collection chamber 11a. Through the connecting port 11d, they enter the frame assembly 200 of the range hood 1 and are forcefully discharged outdoors through the exhaust duct connected to the fan 23, reducing the concentration of fumes in the kitchen and keeping the kitchen air fresh. To enable the range hood 1 to provide flexible smoke extraction modes according to different cooking needs, the smoke collection assembly 100 has an upward single-suction mode (such as...). Figure 2 ), order absorption mode (such as Figure 3 ) and dual suction modes (such as) Figure 4 The upper single-suction mode opens only the upper smoke inlet 11b. In this mode, the upper smoke inlet 11b is far from the heat source of the stove, which can better ensure the thermal efficiency of the stove and prevent excessive heat from being carried away by the lower smoke inlet 11c. This is suitable for cooking operations with low airflow requirements, such as simmering soup or grilling steak. The lower single-suction mode opens only the lower smoke inlet 11c. The fumes are mainly generated at the bottom and are larger, requiring a larger airflow. This is suitable for cooking operations such as deep-frying and stir-frying. The upper and lower dual-suction mode opens both the upper smoke inlet 11b and the lower smoke inlet 11c at the same time. This is suitable for situations where multiple cooking methods are carried out simultaneously. The location of the fumes is not fixed. In the upper and lower dual-suction mode, fumes generated from both the top and bottom can be captured at the same time. The smoke collection component 100 has multiple modes, allowing users to select the appropriate smoke extraction mode to more effectively handle the fumes generated during cooking. Please continue reading. Figure 2 and Figure 3There are various ways to open and close the upper smoke inlet 11b and the lower smoke inlet 11c. In one configuration, the smoke collection assembly 100 also includes an upper opening and closing component 13 and a lower opening and closing component. Both the upper opening and closing component 13 and the lower opening and closing component are movably connected to the smoke collection hood 11. The movable connection can be a rotating connection or a sliding connection. Users can flexibly open or close the upper smoke inlet 11b and the lower smoke inlet 11c according to their cooking needs. In another configuration, the smoke hood 11 includes an upper cover 111 and a lifting cover 112. The upper smoke inlet 11b is located on the upper cover 111 and is opened or closed by the upper opening and closing member 13, while the lower smoke inlet 11c is located on the lifting cover 112. The lifting cover 112 can be raised and lowered relative to the upper cover 111 to open or close the lower smoke inlet 11c. When it is necessary to open the lower smoke inlet 11c, the lifting cover 112 descends relative to the upper cover 111 to open the lower smoke inlet 11c. The lower smoke inlet 11c is closer to the area where the oil fumes are generated, which can more effectively capture and collect the oil fumes, thereby improving the smoke extraction efficiency. like Figure 4 As shown, the smoke collection assembly 100 further includes a glass baffle 14, which is located between the upper opening member 13 and the lower opening member. The glass baffle 14 can be located on the front side of the smoke collection hood 11 facing the user, making the smoke collection assembly 100 more aesthetically pleasing. At the same time, the glass baffle 14 is easier to clean than the metal baffle after being stained with oil, making it easier for the user to clean the appearance of the smoke collection assembly 100. like Figure 5 As shown, by way of example, the smoke collection assembly 100 also includes a push rod motor 15, which is installed in the smoke collection chamber 11a. The push rod motor 15 is used to drive the lifting shell 112 to move up and down relative to the upper cover 111. The automatically lifting lower smoke inlet 11c design can provide a more convenient operating experience. Please continue reading. Figure 5 Furthermore, to guide the inflow path of the fumes drawn in by the lower smoke inlet 11c, the fume hood 11 also includes a guide plate 113. The guide plate 113 is connected to the lifting shell 112 and can move up and down with the lifting shell 112. The guide plate 113 is inclined upward from front to back, which helps to guide the fumes drawn in by the lower smoke inlet 11c to flow smoothly into the fume collection chamber 11a, reducing the diffusion of fumes in the kitchen space. The lifting shell 112 includes a lifting frame 1121 and an air inlet screen 1122. The air inlet screen 1122 is mounted on the lifting frame 1121 and located above the guide plate 113. The mesh of the air inlet screen 1122 is connected to the lower smoke inlet 11c. The air inlet screen 1122 has a filtering function, which can prevent foreign objects from entering the fume collection chamber 11a with the airflow of fumes, making the use of the range hood 1 safer. Understandably, when the smoke collection assembly 100 is in the upper single-suction mode or the upper and lower dual-suction mode, the upper opening and closing part 13 opens the upper smoke inlet 11b; when the smoke collection assembly 100 is in the lower single-suction mode, the upper opening and closing part 13 closes the upper smoke inlet 11b. Users can flexibly choose whether to open the upper smoke inlet 11b according to the amount and type of oil fumes generated during cooking, to achieve a personalized oil fume extraction effect. like Figure 4 and Figure 5 As shown, optionally, the fume hood 11 includes a front panel 1111, a left side panel 1113, a back panel 1112, and a right side panel 1114 connected in sequence. The front panel 1111, left side panel 1113, back panel 1112, and right side panel 1114 are all thin plates. The front panel 1111 and back panel 1112 are arranged opposite each other along the front-rear direction BB. Understandably, the front panel 1111 is located on the front of the fume collection assembly 100, usually opposite the cooking area, to better capture the fumes generated during cooking. The left side panel 1113 and right side panel 1114 are arranged opposite each other along the left-right direction, i.e., on both sides of the front panel 1111 along the left-right direction AA. The left side panel 1113 and right side panel 1114 can be parallel to each other and perpendicularly connected to the front panel 1111 and back panel 1112. The front panel 1111, left side panel 1113, back panel 1112, and right side panel 1114 constitute the aforementioned fume collection chamber 11a for collecting the fumes generated during cooking. Understandably, the fume hood 11 also includes a top plate 1115, which covers the fume collection chamber 11a formed by the front panel 1111, left side panel 1113, back panel 1112, and right side panel 1114, providing a closed space for the fume collection chamber 11a. The top plate 1115 defines the aforementioned communication opening 11d and connects to the frame assembly 200, allowing the fumes to flow smoothly from the fume collection chamber 11a to the frame assembly 200, thereby improving the fume extraction efficiency. Along the left-right direction AA, the frame assembly 200 is connected to the middle of the top plate 1115; this symmetrical layout gives a visually balanced and harmonious feeling. Please continue reading. Figure 5The smoke collection assembly 100 also includes a rectifier 12, which is disposed within the smoke collection chamber 11a and divides the chamber into an auxiliary duct and a main duct 112a. The auxiliary duct 111a connects the upper smoke inlet 11b and the connecting port 11d, providing a smooth flow path for the fumes drawn in through the upper smoke inlet 11b and preventing turbulence caused by collisions between the fumes drawn in through the upper smoke inlet 11b and the fumes drawn in through the lower smoke inlet 11c within the smoke collection chamber 11a. The main duct 112a connects the lower smoke inlet 11c and the connecting port 11d, providing a smooth flow path for the fumes drawn in through the lower smoke inlet 11c and guiding the corresponding fumes smoothly into the frame assembly 200. Therefore, the rectifier 12 effectively guides the fumes drawn in through the upper smoke inlet 11b and / or the lower smoke inlet 11c to flow along their respective preset paths, thereby reducing turbulence and turbulence in the smoke collection chamber 11a. Furthermore, the rectifier 12 guides the oil fumes to flow smoothly, preventing eddies or collisions within the smoke collection chamber 11a, thereby reducing noise. In addition, the rectifier 12 can optimize the path of the oil fume flow, reducing friction between the inhaled fumes and the walls of the smoke collection chamber 11a, further reducing noise and providing a comfortable cooking environment for users. like Figure 5 As shown, further, the rectifier 12 is set to divide the smoke collection chamber 11a into an auxiliary air duct 111a and a main air duct 112a, which can avoid the oil fumes drawn in from the upper smoke inlet 11b and the lower smoke inlet 11c from interfering with each other, reduce wind resistance, improve the smoke extraction efficiency of the range hood 1, reduce the energy consumption of the range hood 1, and allow the oil fumes to enter the fan 23 of the frame assembly 200 more smoothly for exhaust treatment, thereby reducing the concentration of oil fumes in the kitchen. like Figure 6 As shown, the range hood 1 in the figure does not have an upper smoke inlet 11b and a rectifier 12. That is, in the lower single-suction mode, the rising oil fume airflow from the lower smoke inlet 11c will have some vortices on the left and right shoulders of the smoke collection chamber 11a and at the junction of the frame assembly 200 and the smoke collection assembly 100. Figure 7 and Figure 8 As shown, in the dual-suction mode, the oil fumes drawn in by the lower smoke inlet 11c and the upper smoke inlet 11b will converge at the connecting port 11d. However, since the rising oil fumes from the lower smoke inlet 11c flow vertically upwards, while the oil fumes from the upper smoke inlet 11b converge from both sides, the two oil fume airflows affect each other. That is, the oil fume airflow from the upper smoke inlet 11b and the oil fume airflow from the lower smoke inlet 11c interfere with each other, resulting in low oil fume airflow efficiency of the range hood 1. Therefore, the rectifier 12 can reduce the presence of eddies in the left and right shoulders of the smoke inlet 11c and at the junction of the frame assembly 200 and the smoke collection assembly 100 in the single-suction mode, and reduce the interference between the smoke inlet 11b and the smoke inlet 11c in the dual-suction mode. In one configuration, the upper smoke inlet 11b is located on the front panel 1111, and the upper smoke inlet 11b extends horizontally to form a long strip, which can create a larger smoke absorption area and cover a larger smoke absorption area, thereby increasing the smoke absorption range. The long strip-shaped upper smoke inlet 11b can more evenly absorb smoke and reduce the accumulation of smoke in local areas. Accordingly, in this configuration, the number of rectifiers 12 can be one. The rectifier 12 is a long strip-shaped rectifier 12 extending in the left-right direction AA. The long strip-shaped rectifier 12 divides the smoke collection chamber 11a into a main air duct 112a and an auxiliary air duct 111a in the front-back direction BB. The auxiliary air duct 111a is the upper front space of the smoke collection chamber 11a. The high-volume fumes generated during cooking are drawn in by the long strip-shaped upper smoke inlet 11b located on the front panel 1111. The fumes pass through the upper... After the smoke inlet 11b, the smoke enters the upper front space of the smoke collection chamber 11a, namely the auxiliary air duct 111a. This space is divided by the elongated rectifier 12, which can guide the oil fumes drawn in by the upper smoke inlet 11b to the connecting port 11d. The lower oil fumes generated during cooking are captured by the lower smoke inlet 11c located at the bottom of the smoke hood 11, enter the main air duct 112a of the smoke collection chamber 11a through the lower smoke inlet 11c, and flow to the connecting port 11d along the guide of the rectifier 12. like Figure 2 and Figure 5 As shown, in another configuration, the upper smoke inlet 11b includes an upper left smoke inlet 111b and an upper right smoke inlet 112b. The upper left smoke inlet 111b is located at the upper left corner of the left side panel 1113 and / or the front panel 1111, effectively capturing cooking fumes generated on the left side of the stove and ensuring that the fumes do not spread to the right side. The upper right smoke inlet 112b is located at the upper right corner of the right side panel 1114 and / or the front panel 1111, effectively capturing cooking fumes generated on the right side of the stove and ensuring that the fumes do not spread to the left side. The upper left smoke inlet 111b and the upper right smoke inlet 112b correspond to the cooking areas on both sides, effectively capturing fumes, reducing their spread, and improving smoke extraction efficiency. In actual use, the stovetop is usually equipped with two burners, which are spaced apart along the left and right direction AA. The upper left smoke inlet 111b and the upper right smoke inlet 112b can correspond to the cooking fumes produced by one burner, ensuring the independence and efficiency of the cooking areas on both sides. Please continue reading. Figure 5Understandably, the upper left smoke inlet 111b and the upper right smoke inlet 112b can be arranged symmetrically to ensure that the fumes from the cooking areas on both sides are collected evenly, avoiding pollution caused by uneven collection of fumes in the kitchen. In addition, the symmetrical arrangement of the upper left smoke inlet 111b and the upper right smoke inlet 112b is more visually balanced and harmonious, which can improve the overall aesthetics of the smoke collection component 100. Furthermore, both the upper left smoke inlet 111b and the upper right smoke inlet 112b extend horizontally. This horizontal extension increases the contact area between the upper left smoke inlet 111b and the upper right smoke inlet 112b and the fumes, allowing the fumes generated during cooking on the left and right sides of the stove to be drawn in more quickly by the upper left smoke inlet 111b and the upper right smoke inlet 112b, respectively. This reduces the time that fumes remain in the kitchen and keeps the air in the kitchen fresh. like Figure 5 As shown, the auxiliary air duct 111a includes a left auxiliary air duct 1111a and a right auxiliary air duct 1112a. The number of rectifiers 12 can be two, namely a left rectifier 12a and a right rectifier 12b. The right rectifier 12b and the left rectifier 12a are respectively arranged in the smoke collection chamber 11a along the left-right direction AA. Understandably, the left rectifier 12a and the right rectifier 12b can be arranged opposite each other along the central axis of the smoke collection assembly 100. Please see Figure 4 Referring to 5, a left auxiliary air duct 1111a is defined between the left rectifier 12a and the smoke hood 11. Specifically, the left rectifier 12a, part of the front panel 1111, part of the left side panel 1113, and part of the back panel 1112 constitute the left auxiliary air duct 1111a, which connects the upper left smoke inlet 111b and the connecting port 11d. Meanwhile, a right auxiliary air duct 1112a is defined between the right rectifier 12b and the smoke hood 11. Specifically, the right rectifier 12b, part of the front panel 1111, part of the right side panel 1114, and part of the back panel 1112 constitute the right auxiliary air duct 1112a, which connects the upper right smoke inlet 112b and the connecting port 11d. The left auxiliary air duct 1111a and the right auxiliary air duct 1112a provide independent airflow channels, which can handle the smoke drawn in from the upper left smoke inlet 111b and the upper right smoke inlet 112b respectively, improving smoke extraction efficiency. They also more rationally allocate the flow paths of the smoke drawn in from the upper left smoke inlet 111b and the upper right smoke inlet 112b, avoiding mutual interference between the smoke on both sides and reducing airflow chaos. In specific usage scenarios, such as in single-suction mode, due to the geometric structure of the shoulder of the fume hood 11, the fumes drawn in by the lower fume inlet 11c need to change direction to adapt to the flow path inside the fume hood 11. This change in direction may lead to the generation of turbulence, affecting the fume extraction effect of the lower fume inlet 11c. By placing the left rectifier 12a and the right rectifier 12b on both sides of the fume hood 11, the fume flow path becomes smoother. Specifically, the left rectifier 12a, the right rectifier 12b, and the fume hood 11 define the main air duct 112a, which connects the lower fume inlet 11c to the connecting port 11d. This allows the fumes drawn in by the lower fume inlet 11c to smoothly enter the connecting port 11d along the main air duct 112a, reducing the possibility of turbulence being generated in the fume collection chamber 11a. Due to the optimized fume flow path, the noise during fume flow is reduced, making the range hood 1 operate more quietly and improving the user experience. like Figure 5 and Figure 9 As shown, in one embodiment, the fume hood 11 also has a left fume inlet 11e and a right fume inlet 11f. The left fume inlet 11e is located on the left side of the left side panel 1113 or the left side of the front panel 1111, and the right fume inlet 11f is located on the right side of the right side panel 1114 or the right side of the front panel 1111. Along the vertical direction CC, the left fume inlet 11e extends between the upper left fume inlet 111b and the lower fume inlet 11c, and the right fume inlet 11f extends between the upper right fume inlet 112b and the lower fume inlet 11c. This ensures that the fume hood 11 can draw in fumes from both sides of the stove, that is, it can directionally draw in fumes from specific areas, providing a more comprehensive fume extraction coverage, and users can enjoy a faster and more effective fume extraction effect. The left auxiliary air duct 1111a is also connected to the left smoke inlet 11e, and the right auxiliary air duct 1112a is also connected to the right smoke inlet 11f. This helps to optimize the flow path of the oil fumes drawn in by the left smoke inlet 11e and the right smoke inlet 11f, so as to reduce the mutual interference of the smoke flow on both sides and reduce the generation of eddies and turbulence. In one configuration, the bottom end of the left auxiliary air duct 1111a is separated from the main air duct 112a, and the bottom end of the right auxiliary air duct 1112a is also separated from the main air duct 112a. In specific usage scenarios, such as in single-suction mode, for example, if the bottom end of the left auxiliary air duct 1111a is separated from the main air duct 112a, it means that the bottom end of the left rectifier 12a near the left auxiliary air duct 1111a completely isolates the left auxiliary air duct 1111a from the main air duct 112a. This allows the fumes drawn in from the left side of the lower smoke inlet 11c to converge at the connecting port 11d along the guiding effect of the left rectifier 12a towards the main air duct 112a, thus preventing the fumes drawn in from the lower smoke inlet 11c from generating eddies in the smoke collection chamber 11a, thereby improving the smoke extraction efficiency of the lower smoke inlet 11c. In another configuration, the bottom end of the left auxiliary air duct 1111a is connected to the main air duct 112a, and the bottom end of the right auxiliary air duct 1112a is also connected to the main air duct 112a. In specific usage scenarios, such as in single-suction mode, for example, if the bottom end of the left auxiliary air duct 1111a is connected to the main air duct 112a, it means that the bottom end of the left rectifier 12a near the left auxiliary air duct 1111a does not extend to completely isolate the left auxiliary air duct 1111a from the main air duct 112a. This design allows fumes drawn in from the side of the lower smoke inlet 11c near the left auxiliary air duct 1111a to flow into the left auxiliary air duct 1111a. The left rectifier 12a guides the fumes drawn in from the left side of the lower smoke inlet 11c, minimizing the vortex generated at the shoulder of the original smoke hood 11. This eliminates vortexes and improves airflow, thereby enhancing the suction power on the left side of the lower smoke inlet 11c. Simultaneously, fumes drawn in from the center of the lower smoke inlet 11c flow from the main air duct 112a upwards into the connecting port 11d. When the bottom end of the left auxiliary air duct 1111a connects to the main air duct 112a, the suction power on the left side of the lower smoke inlet 11c is enhanced, allowing for more effective fume extraction from specific areas. Understandably, since the left and right sides are symmetrically arranged, the effect on the left side can be explained in the same way as the effect on the right side, which will not be repeated here. This shows that the connected configuration can distribute the smoke between the left auxiliary air duct 1111a, the right auxiliary air duct 1112a and the main air duct 112a, and enhance the smoke extraction effect in specific areas (such as the area near the bottom of the left auxiliary air duct 1111a and the right auxiliary air duct 1112a). like Figure 10 As shown, in one embodiment, the left smoke inlet 11e is connected to the lower smoke inlet 11c, and the right smoke inlet 11f is also connected to the lower smoke inlet 11c, forming a "U" shape. This allows the left and right smoke inlets 11e and 11f, which are positioned opposite each other on the left and right sides, to work together with the lower smoke inlet 11c, enhancing the smoke extraction capacity of the range hood 1 on both sides. Furthermore, the interconnected design makes the smoke flow path more direct, reducing energy loss during the flow process and improving the smoke extraction efficiency of the range hood 1. In one embodiment, both the left smoke inlet 11e and the upper left smoke inlet 111b are located on the front panel 1111, as are the right smoke inlet 11f and the upper right smoke inlet 112b. This centralized design of the left and upper left smoke inlets 11e and 111b, and the right and upper right smoke inlets 11f and 112b, facilitates daily cleaning and maintenance, allowing cleaning to be performed centrally on the front panel 1111. Furthermore, the left and upper left smoke inlets 11e and 111b are connected, as are the right and upper right smoke inlets 11f and 112b. Connecting the left and upper left smoke inlets 11e and 111b, and the right and upper right smoke inlets 11f and 112b, optimizes the internal space utilization of the smoke hood 11, resulting in a more compact structure. The interconnected design also helps reduce interference from different directions of smoke intake, minimizing the generation of eddies and turbulence, and more effectively guiding and concentrating the smoke flow, thereby improving smoke extraction efficiency. like Figure 11 As shown, in one embodiment, the connection between the left smoke inlet 11e and the upper left smoke inlet 111b is located at the upper left corner of the front panel 1111, and the connection between the right smoke inlet 11f and the upper right smoke inlet 112b is located at the upper right corner of the front panel 1111. That is, the vertical left smoke inlet 11e and right smoke inlet 11f are combined with the horizontally arranged upper left smoke inlet 111b and upper right smoke inlet 112b, respectively. The right smoke inlet 11f and the upper right smoke inlet 112b on the right side form a "7" shape, while the left smoke inlet 11e and the upper left smoke inlet 111b on the left side are symmetrically arranged with the right smoke inlet 11f and the upper right smoke inlet 112b on the right side, forming a "Γ" shape. The vertical left smoke inlet 11e and right smoke inlet 11f are responsible for drawing in the fumes near the sides of the stove, while the horizontal left and right smoke inlets are responsible for drawing in the rising fumes. Whether it is a large amount of fumes from frying or a small amount of fumes from stewing, this layout can provide efficient fume extraction. Moreover, this layout can make full use of the space of the front panel 1111, ensuring that the range hood 1 provides efficient fume extraction without taking up too much space. like Figure 12 and Figure 13 As shown, to further enhance the guiding effect of the left rectifier 12a and the right rectifier 12b on the fumes, in one embodiment, the left rectifier 12a includes a left rectifier section 121a and a left guide section 122a that are connected to each other and arranged at an angle. The left rectifier section 121a extends upward from left to right at an angle, which helps to gather the fumes rising from the lower smoke inlet 11c. The left guide section 122a extends upward from left to right at the end of the left rectifier section 121a away from the left side plate 1113 and toward the connecting port 11d. The left guide section 122a can guide the fumes drawn in by the lower smoke inlet 11c and gradually change its flow direction so that it flows smoothly to the connecting port 11d. Similarly, the right-side rectifier 12b includes a right-side rectifier section 121b and a right-side guide section 122b that are connected to each other and arranged at an angle. The right-side rectifier section 121b extends upward from right to left at an angle, and the right-side guide section 122b extends upward from right to left from the end of the right-side rectifier section 121b away from the right-side plate 1114 and toward the connecting port 11d. Through the design of the left-side rectifier section 121a and the left-side guide section 122a, the right-side rectifier section 121b and the right-side guide section 122b, the oil fumes drawn in by the lower smoke inlet 11c can be effectively gathered and guided, reducing the collision of oil fumes in the smoke collection chamber 11a. like Figure 14 As shown, in one embodiment, the left rectifying section 121a, the left guiding section 122a, the right rectifying section 121b, and the right guiding section 122b are each a flat plate or an arc-shaped plate. Understandably, the flat plate design is relatively simple, easy to manufacture and process, and can improve production efficiency and reduce manufacturing costs. The arc-shaped plate design can better guide the flow of oil fumes, gradually changing the flow direction of the oil fumes, allowing them to flow more smoothly and gently towards the connecting opening 11d. like Figure 5 and Figure 12 In one embodiment, the left rectifier section 121a is sealed to both the front panel 1111 and the back panel 1112, and the left guide section 122a is also sealed to both the front panel 1111 and the back panel 1112. This sealed connection prevents fumes from overflowing through the gaps between the left rectifier section 121a and the left guide section 122a and the front panel 1111 and back panel 1112. The fumes can flow according to a preset path provided by the left rectifier section 12a, effectively guiding them to the connecting port 11d. Furthermore, the left end of the left rectifier section 121a is either sealed to or spaced apart from the left side panel 1113. This sealed connection prevents fumes from flowing into the left auxiliary duct 1111a through the gap between the left end of the left rectifier section 121a and the left side panel 1113, ensuring accurate guidance of fume flow. The spaced-apart connection can optimize fume flow in specific situations; for example, in single-suction mode, the spaced-apart connection can enhance the suction power of the left auxiliary duct 1111a. Please continue reading. Figure 14For example, along the front-to-back direction BB, the left rectifier section 121a has a first folded edge 1211a and a second folded edge arranged opposite to each other, and a plurality of first connecting holes are provided on the first folded edge 1211a and the second folded edge. The left guide section 122a has a third folded edge 1221a and a fourth folded edge arranged opposite to each other, and a plurality of second connecting holes are provided on the third folded edge 1221a and the fourth folded edge. The front panel 1111 and the back panel 1112 are provided with a first plug-in hole and a second plug-in hole respectively adapted to the first connecting hole and the second connecting hole. A first connector is inserted into the first connecting hole and the first plug-in hole, and a second connector is inserted into the second connecting hole and the second plug-in hole, so as to realize the sealed connection between the left rectifier section 121a and the front panel 1111 and the back panel 1112, and the sealed connection between the left guide section 122a and the front panel 1111 and the back panel 1112. As above, the right rectifier section 121b is sealed to the front panel 1111 and the back panel 1112, and the right guide section 122b is sealed to the front panel 1111 and the back panel 1112. The right end of the right rectifier section 121b is sealed to the right side panel 1114 or is spaced apart. The related effects are the same as those of the left rectifier section 121a and the left guide section 122a, and will not be described again here. like Figure 12 As shown, in one embodiment, along the direction from bottom to top, the first distance D1 between the left rectifier section 121a and the right rectifier section 121b in the left-right direction AA gradually decreases, and the second distance D2 between the left guide section 122a and the right guide section 122b in the left-right direction AA also gradually decreases. This causes the cross-sectional area in the main air duct 112a to gradually decrease, so that the oil fumes gradually concentrate in the middle area during the rising process, which helps to gather the oil fumes sucked in by the lower smoke inlet 11c, thereby accelerating the flow speed of the oil fumes sucked in by the lower smoke inlet 11c into the connecting port 11d and improving the oil fume extraction efficiency of the range hood 1. Please continue reading. Figure 12 Furthermore, the rate of decrease of the first distance D1 is greater than the rate of decrease of the second distance D2. This helps to enhance the guiding effect of the left rectifier section 121a and the right rectifier section 121b on the incoming oil fumes, so that the fumes are more concentrated and flow into the space between the left guide section 122a and the right guide section 122b. As D1 takes effect quickly, the channel through which the oil fumes can flow becomes narrower, which can reduce the diffusion of oil fumes to both sides. By accelerating the flow of oil fumes, the suction power required by the fan 23 is reduced, thereby reducing the energy consumption of the range hood 1. like Figure 12 and Figure 14As shown, in one embodiment, the left-side rectifier 12a further includes a left-side flow stabilizing section 123a. The left-side flow stabilizing section 123a is connected to the end of the left-side guide section 122a opposite to the left-side rectifier section 121a, continuing the function of the left-side guide section 122a. The left-side flow stabilizing section 123a extends from bottom to top towards the connecting port 11d, further guiding the oil fumes to flow smoothly towards the connecting port 11d. The extension of the left-side flow stabilizing section 123a from bottom to top towards the connecting port 11d is consistent with the overall flow trend of the oil fumes within the fume hood 11, providing a vertically upward stable flow area for the oil fumes. Furthermore, the left flow stabilizer section 123a is sealed to the front panel 1111 and the back panel 1112. For example, along the front-rear direction BB, the left flow stabilizer section 123a has a fifth folded edge 1231a and a sixth folded edge arranged opposite to each other. The fifth folded edge 1231a and the sixth folded edge are provided with a plurality of third connecting holes. The front panel 1111 and the back panel 1112 are provided with third insertion holes adapted to the third connecting holes. Third connectors are inserted into the third connecting holes and the third insertion holes to achieve a sealed connection between the left flow stabilizer section 123a and the front panel 1111 and the back panel 1112. The left flow stabilizer section 123a can also enhance the structural stability of the left rectifier 12a and reduce the vibration of the left rectifier 12a caused by the impact of oil fumes. Similarly, the right-side rectifier 12b also includes a right-side flow stabilizer section 123b, which is connected to the end of the right-side guide section 122b away from the right-side rectifier section 121b. The right-side flow stabilizer section 123b extends from bottom to top toward the connecting port 11d. The related effects are the same as those of the left-side flow stabilizer section 123a, and will not be described again here. like Figure 12 As shown, in one embodiment, the left rectifier 12a satisfies one of the following conditions: the left rectifier section 121a and the left guide section 122a are arranged in an arc transition; the left guide section 122a and the left stabilizing section 123a are arranged in an arc transition; and the left stabilizing section 123a has a first height H1 along the vertical direction CC, where H1 ≥ 5 mm. The left rectifier section 121a and the left guide section 122a are set with a rounded transition, which reduces the turbulence generated when the fumes turn between the left rectifier section 121a and the left guide section 122a, making the flow of the fumes smoother. The rounded transition, as a natural curve, helps to guide the fumes smoothly from the left rectifier section 121a to the left guide section 122a. Compared with sharp corners, the rounded transition can reduce the resistance of the fumes when turning, increase the flow speed of the fumes, and reduce the possibility of the fumes lingering at the corner. The left guide section 122a and the left stabilizing section 123a are set with an arc transition, which can reduce the eddies generated when the oil fumes come into contact with the connection of the left guide section 122a and the left stabilizing section 123a, thereby reducing the flow resistance and allowing the oil fumes to pass smoothly and unimpeded through the connection of the left guide section 122a and the left stabilizing section 123a, avoiding collisions and interference during the flow of oil fumes. Please continue reading. Figure 12 Along the vertical direction CC, the left stable flow section 123a has a first height H1, H1≥5mm. Limiting a certain height can provide a sufficiently long stable flow area for oil fumes, which helps to maintain the continuity of oil fume flow and reduce disordered changes in the oil fume flow process. Furthermore, considering the structure of the left rectifier 12a, the left stabilizing section 123a has a certain height, which can provide better support for the left rectifier 12a and improve the stability and durability of the left rectifier 12a. In one embodiment, the right-side rectifier 12b satisfies one of the following conditions: the right-side rectifier section 121b and the right-side guide section 122b are arranged with an arc transition; the right-side guide section 122b and the right-side stabilizing section 123b are arranged with an arc transition; and the right-side stabilizing section 123b has a second height H2 along the vertical direction CC, where H2 ≥ 5 mm. The related effects are the same as those of the left-side rectifier 12a, and will not be repeated here. like Figure 15 As shown, in one embodiment, the rectifier 12 is at least partially rotatable relative to the fume hood 11, so that at least one of the auxiliary air duct 111a and the main air duct 112a is connected to the connecting port 11d. The rectifier 12, which is at least partially rotatable, can change its shape by rotation to plan the flow path of the oil fumes drawn in by the upper smoke inlet 11b and the lower smoke inlet 11c at different positions, reduce unnecessary interference and eddies, and thus optimize the effect of oil fume collection and discharge. The partially rotatable rectifier 12 can also adjust the connection state between the auxiliary air duct 111a and / or the main air duct 112a and the connecting port 11d according to actual usage needs, so as to adapt to different cooking and fume extraction needs and achieve the best fume extraction effect. For example, in the configuration where the upper smoke inlet 11b is located on the front panel 1111 and is elongated, and the number of rectifiers 12 is one, when the rectifier 12 is an elongated rectifier 12 extending to the left and right, in the upper single-suction mode, the elongated rectifier 12 rotates to connect the front panel 1111 and the back panel 1112, isolating the main air duct 112a and the auxiliary air duct 111a, and connecting the auxiliary air duct 111a and the connecting port 11d, thereby increasing the volume of the auxiliary air duct 111a, which facilitates the upper smoke inlet 11b to suck in a large amount of oil fumes, and more effectively guides the oil fumes to be sucked in from the upper smoke inlet 11b and quickly enters the connecting port 11d through the auxiliary air duct 111a, thereby improving the oil fume suction efficiency of the upper smoke inlet 11b. In single-suction mode, the elongated rectifier 12 can rotate to cover the upper smoke inlet 11b, connecting the main air duct 112a and the connecting port 11d, thus increasing the volume of the main air duct 112a and more effectively guiding the fumes into the lower smoke inlet 11c, which then quickly enters the connecting port 11d through the main air duct 112a, thereby improving the smoke extraction efficiency of the lower smoke inlet 11c. In dual-suction mode, the elongated rectifier 12 rotates to a position between the front panel 1111 and the back panel 1112 along the front-to-back direction BB. At this time, both the auxiliary air duct 111a and the main air duct 112a are connected to the connecting port 11d, optimizing the flow path of the fumes, and providing comprehensive smoke extraction effect for the range hood 1. Please continue reading. Figure 15 In one embodiment, the rectifier 12 includes a rectifier section 121 and a guide section 122 rotatably connected to each other, so that the guide section 122 can rotate relative to the fume hood 11. By adjusting the position of the guide section 122, the flow direction and speed of the fumes can be optimized, reducing airflow resistance and turbulence, and improving fume extraction efficiency. The rotatable guide section 122 can isolate or connect the auxiliary air duct 111a and the connecting port 11d, that is, the fume collection assembly 100 can change the rotation angle of the guide section 122 relative to the rectifier section 121 according to the actual cooking situation. Understandably, the rectifier 12 also includes a flow stabilizer section 123, which is connected to the end of the guide section 122 away from the rectifier section 121. The flow stabilizer section 123 extends in the vertical direction CC. When the guide section 122 rotates relative to the rectifier section 121, it drives the flow stabilizer section 123 to rotate together. In the aforementioned configuration of the elongated upper smoke inlet 11b and the elongated rectifier 12, the rectifier section 121 can be fixedly connected to the front panel 1111 and the back panel 1112, and the guide section 122 can be rotatably connected to one end of the rectifier section 121. The rectifier section 121 provides a stable support foundation for the elongated rectifier 12. In the upper single-suction mode, the guide section 122 rotates away from the upper smoke inlet so that the auxiliary air duct 111a is connected to the connecting port 11d; in the lower single-suction mode, the guide section 122 rotates towards the upper smoke inlet so that the auxiliary air duct 111a is separated from the connecting port 11d; in the upper and lower dual-suction mode, along the front-to-back direction BB, the guide section 122 rotates to a position between the upper smoke inlet and the back panel 1112 so that both the auxiliary air duct 111a and the main air duct 112a are connected to the connecting port 11d. Understandably, by setting a servo motor, the guide section 122 can remain relatively stable after rotating to a suitable angle. At the same time, by setting minimum and maximum soft limits, it can be ensured that the guide section 122 will not exceed the predetermined range during rotation, thereby maintaining the relative state. like Figure 16 and Figure 17 As shown, specifically, the different rotation states of the guide section 122 relative to the rectifying section 121 correspond to different working modes of the smoke collection assembly 100. When the smoke collection assembly 100 is in the upper single suction mode, the guide section 122 rotates relative to the smoke hood 11 to the first conducting position to conduct the auxiliary air duct 111a and the connecting port 11d, thereby improving the smoke extraction efficiency of the upper smoke inlet 11b. To avoid interference from the lower smoke inlet 11c below the upper smoke inlet 11b, the lower opening and closing part closes the lower smoke inlet 11c, or the lifting shell 112 moves upward to close the lower smoke inlet 11c. This also prevents smoke from escaping from below. This method is suitable for cooking methods such as steaming and stewing, where smoke is mainly generated at the upper position. like Figure 18 As shown, when the smoke collection assembly 100 is in the single-suction mode, the lower opening and closing part opens the lower smoke inlet 11c or the lifting shell 112 moves downward to open the lower smoke inlet 11c, that is, the suction is concentrated on the lower smoke inlet 11c, which can quickly suck up the oil fumes generated during cooking. At this time, the guide section 122 rotates relative to the smoke collection hood 11 to the closed position to close the auxiliary air duct 111a and the connecting port 11d, which isolates the auxiliary air duct 111a and also prevents the oil fumes sucked in by the lower smoke inlet 11c from escaping from the upper smoke inlet 11b. like Figure 19 and Figure 20As shown, when the smoke collection assembly 100 is in the dual-suction mode, the guide section 122 rotates relative to the smoke hood 11 to the second open position to connect the auxiliary air duct 111a and the connecting port 11d. The lower opening / closing component opens the lower smoke inlet 11c, or the lifting shell 112 moves downward to open the lower smoke inlet 11c. At this time, the upper smoke inlet 11b and the lower smoke inlet 11c are opened simultaneously, which can comprehensively capture the oil fumes generated during the user's cooking process. In the rotation direction of the guide section 122, the second open position is located between the first open position and the closed position, which reasonably plans the flow path of the oil fumes drawn in by the upper smoke inlet 11b and the lower smoke inlet 11c. This allows the oil fumes to be effectively collected and discharged from both the upper and lower directions, and reduces the eddy currents and collisions of oil fumes in the smoke hood 11, thereby improving the smoke extraction efficiency. like Figure 15 As shown, in one embodiment, the angle between the rectifying section 121 and the guide section 122 is α. When the guide section 122 is in the first conducting position, α ≥ 180°, making the volume of the auxiliary air duct 111a larger to maximize the air intake of the upper smoke inlet 11b. In this state, it can handle light cooking scenarios, such as steaming, boiling, and grilling steak. This avoids the lower smoke inlet 11c, which is raised and lowered, from taking up too much kitchen space. Furthermore, since the upper smoke inlet 11b is located away from the heat source, it can better ensure the thermal efficiency of the stove and prevent excessive heat from being carried away by the lower smoke inlet 11c, thus reducing thermal efficiency. Steaming, boiling, and grilling steak require low airflow, which can minimize the operating noise of the range hood. Please continue reading. Figure 15 When the guide section 122 is in the closed position, α≤90°, which maximizes the air intake of the lower smoke inlet 11c. The oil fumes are concentrated at the lower smoke inlet 11c, allowing the fumes generated during stir-frying to be quickly absorbed. The lower smoke inlet 11c's downward placement ensures rapid removal of cooking fumes, preventing oil stains from spreading to the user's breathing area and affecting their health. Please continue reading. Figure 15 When the guide section 122 is in the second conductive position, 90° < α < 180°, allowing both the auxiliary air duct 111a and the main air duct 112a to be connected to the connecting port 11d. This balances the fume extraction capacity of the upper smoke inlet 11b and the lower smoke inlet 11c, adapting to various cooking methods. When the guide section 122 is in the second conductive position, it allows the upper smoke inlet 11b and the lower smoke inlet 11c to operate simultaneously, increasing the fume extraction area and improving fume extraction efficiency. like Figure 19 and Figure 21As shown, in the configuration of the upper smoke inlet 11b including the upper left smoke inlet 111b and the upper right smoke inlet 112b, and the number of rectifiers 12 is two, a left rotating shaft 124a is provided between the left rectifier section 121a and the left guide section 122a, and a right rotating shaft 124b is provided between the right rectifier section 121b and the right guide section 122b. The design of the rotating shaft provides greater flexibility, allowing the left rectifier 12a and the right rectifier 12b to be dynamically rotated and adjusted according to actual usage. In the closed position, i.e., in the single-suction mode, the second distance D2 between the left guide section 122a and the right guide section 122b in the left-right direction AA gradually decreases from top to bottom. That is, the oil fume flow area of ​​the main air duct 112a gradually expands. As the flow area increases, unnecessary retention of oil fumes in the smoke collection chamber 11a can be reduced. The gradually expanding flow area helps the flow of oil fumes sucked in by the lower smoke inlet 11c, and the oil fumes can be sucked away more quickly. It also helps to reduce the noise that may be generated due to the acceleration of airflow. Please continue reading. Figure 21 Furthermore, in the closed position, i.e. in the single-suction mode, along the direction from top to bottom, the third distance D3 between the left stabilizing section 123a and the right stabilizing section 123b in the left-right direction AA gradually decreases. That is, the flow area of ​​the oil fume flowing into the stabilizing area of ​​the main air duct 112a gradually expands. As the flow area increases, the resistance to the flow of oil fume decreases, the flow of oil fume becomes smoother, and unnecessary retention of oil fume in the smoke collection chamber 11a is avoided, thereby improving the oil fume suction capacity of the lower smoke inlet 11c. Secondly, please refer to Figure 1 and Figure 5 This application provides a range hood 1, which includes a frame assembly 200 and a smoke collection assembly 100 as described in any of the above embodiments. The frame assembly 200 is used to accommodate components such as a fan 23 and a motor, and works in conjunction with the smoke collection assembly 100 to effectively exhaust the oil fumes and steam generated during cooking. like Figure 21 As shown, the smoke collection assembly 100 is located below the frame assembly 200. The connecting port 11d connects the smoke collection chamber 11a and the frame assembly 200. The fan 23 inside the frame assembly 200 is a noise source. When the noise from the fan 23 inside the frame 21 diffuses downwards, the projection of the rectifier 12 along the vertical direction CC of the range hood 1 overlaps with the projection of the connecting port 11d. That is, the rectifier 12 can act as a barrier to block or reduce the downward diffusion of the noise generated by the fan 23. By controlling the direction of noise propagation, the noise radiation to the user's activity area is reduced, the noise of the range hood 1 is reduced, and a quieter cooking environment is provided for the user. In this embodiment, the rectifier 12 not only guides airflow but also blocks noise, realizing the design concept of one device serving multiple purposes. like Figure 18 and Figure 21 As shown, in the configuration of the upper smoke inlet 11b including the upper left smoke inlet 111b and the upper right smoke inlet 112b, and the number of rectifiers 12 is two, the fan 23 is installed inside the frame assembly 200. The noise it transmits is radiated into the smoke collection chamber 11a through the connecting port 11d, causing abnormal noise. Along the left-right direction AA, the minimum distance between the left rectifier 12a and the right rectifier 12b is the fourth distance D4. The left wall 111d and the right wall 112d of the connecting port 11d have a fifth distance D5. D4 < D5, that is, the distance between the left rectifier 12a and the right rectifier 12b is less than the distance between the left and right walls 112d of the connecting port 11d. At this time, the left rectifier 12a and the right rectifier 12b can form a certain sound isolation zone at the connecting port 11d, reducing the direct radiation of the fan 23 noise into the smoke collection chamber 11a. This causes sound waves to scatter when passing through the connection port 11d, thereby reducing the propagation of noise. Furthermore, in this single-suction mode, both the left guide section 122a and the right guide section 122b rotate to the closed position relative to the smoke hood 11, allowing the oil fume airflow to be concentrated and then diffused, avoiding the formation of eddies, and making the oil fume airflow drawn in by the lower smoke inlet 11c flow more smoothly, thereby improving the oil fume extraction efficiency. like Figure 19 As shown, in one embodiment, the projections of the left guide section 122a and the right guide section 122b along the vertical direction CC both fall at least partially within the connecting opening 11d. Since at least a portion of the projections of the left guide section 122a and the right guide section 122b fall within the connecting opening 11d, a physical barrier is formed, preventing noise propagated by the fan 23 from entering the smoke collection chamber 11a, thereby reducing abnormal noise. The left guide section 122a and the right guide section 122b can change the propagation mode of sound waves within the smoke collection chamber 11a, reducing the straight-line propagation of noise through reflection and absorption. Please continue reading. Figure 19 In one embodiment, the projections of the left and right flow stabilizing sections 123a and 123b along the vertical direction CC both fall within the connecting opening 11d. This means that the left and right flow stabilizing sections 123a and 123b form a built-in acoustic barrier, altering the propagation path of sound waves within the smoke collection chamber 11a, reducing the straight-line propagation of noise, and helping to block the downward propagation of noise generated by the fan 23. By blocking noise radiated directly from the connecting opening 11d, the possibility of noise propagating into the kitchen space through the upper smoke inlet 11b and lower smoke inlet 11c is reduced. The left and right flow stabilizing sections 123a and 123b cause sound waves to be scattered or partially absorbed when passing through the connecting opening 11d, reducing noise intensity. In one embodiment, the rectifier 12 includes a first rectifier plate and a second rectifier plate. The second rectifier plate is connected to the first rectifier plate to jointly form a silencing cavity. The silencing cavity can serve as a noise absorption and dispersion area, helping to reduce the propagation of noise within the smoke hood 11. The first rectifier plate and / or the second rectifier plate have silencing holes communicating with the silencing cavity. The silencing holes allow the silencing cavity to connect with external airflow, further dispersing and absorbing the noise generated within the smoke hood 11. Through the arrangement of the silencing cavity and silencing holes, the noise propagating within the smoke hood 11a can be significantly reduced, thereby reducing the noise level of the range hood 1 during operation and providing users with a quieter cooking environment. In one embodiment, the rectifier 12 further includes a silencing element, which is typically made of a porous material such as polyurethane foam, fiberglass, rock wool, or a special plastic material, all of which have excellent sound wave absorption properties. The silencing element may also have a specific geometry, such as a labyrinthine, tortuous channel, or chamber, to increase the propagation path of sound waves within the material and improve absorption efficiency. The silencing element, positioned within the silencing cavity, effectively absorbs and reduces the noise generated by the range hood 1 through its structure and material properties. like Figure 22 As shown, during the use of the range hood 1, the motor-driven fan 23 creates a powerful negative pressure zone, which effectively draws the cooking fumes generated in the kitchen into the range hood 1. However, the grease in the fumes often condenses into oil droplets after being strongly suctioned by the fan 23. These oil droplets accumulate inside the frame assembly 200 with the airflow, causing more and more grease to accumulate on the inner top wall of the frame assembly 200, eventually forming oil droplets that fall down. The grease on the side walls of the frame assembly 200 flows downward and drips onto the guide plate 113. To address the above problems, in one implementation method, please refer to [link / reference needed]. Figure 23 and Figure 24 The frame assembly 200 includes a frame 21, a connecting flange 22, and a fan 23. The frame 21 serves as the supporting structure of the frame assembly 200, providing a stable mounting platform for the fan 23, motor, and other components. It is typically made of robust and durable materials, such as steel plates, aluminum alloys, or other metal alloys, to withstand the forces and weight generated during equipment operation. The frame 21 may be cuboid, with a regular shape, making it easy to clean. The upper side of the connecting flange 22 is connected to the frame 21, and the lower side of the connecting flange 22 is connected to the top plate 1115. The connecting flange 22 is connected to the bottom end of the frame 21 and together with the frame 21, forms the fan cavity 21a. The fan cavity 21a communicates with the connecting port 11d. The fan 23 is located inside the fan cavity 21a and above the connecting flange 22. The motor drives the fan 23 to create a negative pressure zone, drawing the oily fumes from the kitchen into the interior of the range hood 1. The frame 21 includes a left mounting plate 211 and a right mounting plate 212 arranged opposite each other in the left-right direction AA, and a top mounting plate 213 connecting the left mounting plate 211 and the right mounting plate 212. The range hood 1 also includes a check valve assembly 300, which is installed on the top mounting plate 213. The fan 23 has an air outlet, which passes through the mounting plate and communicates with the check valve assembly 300. The check valve assembly 300 can prevent the oil fumes generated during cooking from flowing back into the room through the air outlet of the fan 23, ensuring fresh indoor air. Please continue to refer to this. Figure 23 and Figure 24 Furthermore, the rack assembly 200 also includes a top oil guiding structure 24, which includes a left oil guiding structure 241 and a right oil guiding structure 242 connected to each other. The left oil guiding structure 241 and the right oil guiding structure 242 are arranged opposite to each other. The left oil guiding structure 241 is connected to the left mounting plate 211 and is inclined upward from left to right. The right oil guiding structure 242 is connected to the right mounting plate 212 and is inclined upward from right to left. That is, the top oil guiding structure 24 can be in the shape of "︿", so that the oil on the top mounting plate 213 can be guided along the top oil guiding structure 24 from the left mounting plate 211 and the right mounting plate 212 to the lower connecting flange 22. In this embodiment, the connecting flange 22 not only plays a connecting role, but also has an oil guiding function. Along the vertical direction CC of the range hood 1, the projection of the rectifier 12 and the projection of the connecting flange 22 partially overlap within the connecting port 11d. This allows oil droplets from the connecting flange 22 to drip through the connecting port 11d onto the upper surface of the rectifier 12. The overlap of the projections of the rectifier 12 and the connecting flange 22 creates a natural oil guiding path, enabling oil droplets to smoothly drip from the connecting flange 22 onto the rectifier 12. This reduces the accumulation of oil in the fan cavity 21a, keeps the fan 23 and airflow channels unobstructed, and helps maintain the efficient operation of the range hood 1. Please continue to refer to this. Figure 23 Understandably, the smoke collection assembly 100 also includes an oil cup 16, which is connected to the smoke collection hood 11, located at the bottom of the smoke collection hood 11, and extends along the left-right direction AA, covering a wider area. The design of the oil cup 16 prevents oil from dripping directly onto the stove or cooking area. Along the vertical direction CC of the range hood 1, the projection of the oil cup 16 can cover the projection of the rectifier 12. The upper surface of the oil cup 16 has an oil drain hole (not shown), through which the oil collected at the rectifier 12 can enter the oil cup 16, preventing it from dripping directly onto the lower inlet guide plate 113, keeping the guide plate 113 clean, and helping to maintain the smoke extraction efficiency of the range hood 1, preventing the lower smoke inlet 11c from being blocked due to oil accumulation. like Figure 22As shown in the figure, without the rectifier 12, the flowing oil on the left and right mounting plates 211 and 212 would drip directly onto the guide plate 113. However, this embodiment utilizes the rectifier 12, which not only plays a crucial role in guiding airflow but also serves as a structure for guiding oil flow, thus enhancing the structure's versatility. This design allows the oil to be effectively guided and concentrated by the connecting flange 22 and the rectifier 12 as it enters the oil cup 16, preventing oil buildup inside the range hood and even dripping onto the food the user is cooking. Understandably, when the rectifier 12 is also used as a physical barrier to reduce noise, the first rectifier plate has an upper surface for oil flow, and the second rectifier plate is stacked on the first rectifier plate, disposed on the lower side of the first rectifier plate, and has sound-absorbing holes. like Figure 25 and Figure 26 In the above-mentioned configuration where the upper smoke inlet 11b includes the upper left smoke inlet 111b and the upper right smoke inlet 112b, and the number of rectifiers 12 is two, the left rectifier 12a is inclined downward from right to left and from front to back; and / or the right rectifier 12b is inclined downward from left to right and from front to back. The inclined design of the upper surface of the rectifier 12 helps to guide the oil to flow in a specific direction and reduce the retention of oil on the surface of the rectifier 12. Specifically, when the upper surfaces of the left rectifier 12a and the right rectifier 12b are configured as described above, during the actual flow process, oil sludge first converges from the left mounting plate 211 and the right mounting plate 212 onto the connecting flange 22. Along the front-to-back direction BB, the upper surfaces of the left rectifier 12a and the right rectifier 12b are inclined, causing the oil sludge to flow towards the back plate 1112, preventing oil sludge from accumulating near the front panel 1111. Since the front panel 1111 has an upper smoke inlet 11b, oil sludge can prevent clogging of the upper smoke inlet 11b. Along the left-to-right direction AA, oil sludge dripping from the connecting flange 22 onto the left rectifier 12a and the right rectifier 12b can flow towards both sides of the smoke hood 11, preventing it from dripping onto the guide plate 113, reducing the possibility of oil sludge directly dripping onto the guide plate 113, and avoiding interference with the guide plate 113's flow guiding effect. like Figure 23As shown, in one embodiment, the left guide section 122a extends upward from left to right toward the connection port 11d from the end of the left rectifier section 121a away from the left side plate 1113, and the right guide section 122b extends upward from right to left toward the connection port 11d from the end of the right rectifier section 121b away from the right side plate 1114. The projections of the left guide section 122a and the right guide section 122b along the vertical direction CC both fall at least partially into the connection port 11d, which helps to control the drip trajectory of the oil droplets, so that the dripping oil droplets can land on the left guide section 122a and the right guide section 122b, reducing the splashing of oil droplets to the outside of the left rectifier 12a and the right rectifier 12b. The left guide section 122a and the right guide section 122b, which are inclined toward the connection port 11d, help to guide the oil sludge to flow to the left rectifier section 121a and the right rectifier section 121b respectively. Please continue reading. Figure 23 In one embodiment, both the left flow stabilizing section 123a and the right flow stabilizing section 123b extend upward toward the connecting port 11d, and the projections of the left flow stabilizing section 123a and the right flow stabilizing section 123b along the vertical direction CC fall into the connecting port 11d. The left flow stabilizing section 123a and the right flow stabilizing section 123b can form a barrier to prevent oil dripping onto the upper surfaces of the left rectifier 12a and the right rectifier 12b from splashing out, thereby reducing the possibility of oil dripping onto the upper surfaces splashing onto the guide plate 113. Understandably, in this embodiment, the left end of the left rectifier section 121a is spaced apart from the left side plate 1113, and the right end of the right rectifier section 121b is spaced apart from the right side plate 1114. Oil stains on the left rectifier 12a can drip through the gap between the left rectifier section 121a and the left side plate 1113; similarly, oil stains on the right rectifier 12b can drip through the gap between the right rectifier section 121b and the right side plate 1114. Furthermore, the guide plate 113 has a certain gap between its two sides along the left-right direction AA and the smoke hood 11, allowing oil stains flowing to the ends of the left rectifier 12a and the right rectifier 12b to pass through the gap and fall into the oil drain hole. The oil stains are ultimately collected in the oil cup 16 below the oil drain hole for easy periodic cleaning. Furthermore, during the upward flow of oily fumes from the lower smoke inlet 11c, oil droplets will condense on the lower surfaces of the left rectifier 12a and the right rectifier 12b. The inclined arrangement also allows the oil droplets on the lower surfaces of the left rectifier 12a and the right rectifier 12b to be guided to the left and right sides and to the side closer to the back plate 1112, so that the oil condensed on the left rectifier 12a and the right rectifier 12b can enter the oil cup 16 through the oil leakage hole. like Figure 23 and Figure 24Furthermore, in order to ensure that the oil flowing on the left mounting plate 211 of the frame 21 can drip directly onto the left rectifier 12a, in one embodiment, along the left-right direction AA, there is a sixth distance D6 between the left stabilizing section 123a and the left wall 111d of the connecting port 11d, where 25mm≤D6≤35mm. By limiting the range of the sixth distance D6, it can be ensured that the oil drips accurately onto the left rectifier 12a, avoiding oil splashing or deviation from the target area. An appropriate sixth distance D6 helps to improve the efficiency of oil collection, ensuring that the oil flowing on the left mounting plate 211 is effectively guided to the left rectifier 12a, reducing pollution to other components of the range hood 1. As above, please continue to refer to... Figure 24 In order to allow the oil flowing on the right mounting plate 212 of the frame 21 to drip directly onto the right rectifier 12b, there is a seventh distance D7 between the right flow stabilizing section 123b and the right wall 112d of the connecting port 11d, where 25mm≤D7≤35mm. Since the left and right sides are symmetrically arranged, the effect on the left side is explained, and the effect on the right side can be deduced in the same way, which will not be elaborated here. In one embodiment, the connecting flange 22 has a first oil guide groove 2232a located within the smoke collection chamber 11a. The first oil guide groove 2232a extends in a left-right direction AA and has a left slot and a right slot opposite each other in the left-right direction AA. The left slot faces the top of the left rectifier 12a, and the right slot faces the top of the right rectifier 12b. Oil in the first oil guide groove 2232a is discharged through the left and right slots to guide oil droplets from the connecting flange 22 to the left rectifier 12a and the right rectifier 12b. The first oil guide groove 2232a provides a clear oil guiding path, ensuring that oil droplets can be guided orderly from the connecting flange 22 to the left rectifier 12a and the right rectifier 12b, and preventing oil droplets from dripping disorderly within the smoke collection chamber 11a. like Figure 23 and Figure 27As shown, in one embodiment, the connecting flange 22 includes an oil receiving base plate 221, a surrounding plate 222, and an oil guide 223. The oil receiving base plate 221 is disposed below the fan 23 and is arranged opposite to the top mounting plate 213 of the frame 21. The oil receiving base plate 221 can be a square plate. The oil receiving base plate 221 is used to receive oil droplets dripping from the area of ​​the fan 23 and guide the oil droplets to the oil guide 223. The surrounding plate 222 is connected to the frame 21 and the fume hood 11, and the surrounding plate 222 can be connected to the frame 21 and the fume hood 11 by means of screws and riveting. Furthermore, the surrounding plate 222 is arranged around the oil receiving base plate 221. The surrounding plate 222 serves to connect and fix the oil receiving base plate 221. The rear side wall of the surrounding plate 222 and the rear side wall of the oil receiving base plate 221 are spaced apart to form a guide port 22a. The guide port 22a is embedded in the connecting port 11d to communicate with the smoke collection chamber 11a. The oil guide component 223 is connected to the oil receiving base plate 221 and is located in the guide port 22a. It has a first oil guide groove 2232a. The oil guide component 223 is used to guide the oil droplets on the oil receiving base plate 221 to the left rectifier component 12a and the right rectifier component 12b. The oil receiving plate 221 can be tilted downwards from front to back, that is, tilted towards the direction of the oil guide 223, which can effectively guide the oil droplets falling on the oil receiving plate 221 to flow to the predetermined area and prevent the oil droplets from accumulating on the oil receiving plate 221. Please continue to refer to Figure 27 Furthermore, the oil guide 223 includes a connecting plate 2231 and a slotted plate 2232. The connecting plate 2231 is connected to the rear side wall of the oil receiving base plate 221 and extends downward from the oil receiving base plate 221 into the smoke collection chamber 11a. The connecting plate 2231 and part of the surrounding plate 222 enclose and define the guide opening 22a. A stepped surface is formed between the connecting plate 2231 and the oil receiving base plate 221. When the oil droplets on the oil receiving base plate 221 flow to the connection between the oil receiving base plate 221 and the connecting plate 2231, they can flow down the connecting plate 2231 due to gravity. The slotted plate 2232 is connected to the bottom end of the connecting plate 2231 and has a first oil guide groove 2232a, so that the flowing oil droplets accumulate in the first oil guide groove 2232a, ensuring that the oil droplets can flow in a predetermined direction. The first oil guide groove 2232a of the slotted plate 2232 provides a space for the oil droplets to accumulate and flow, ensuring that the oil droplets can be collected efficiently. like Figure 28 and Figure 29 As shown, in one embodiment, the first oil guiding groove 2232a has a bottom wall along the left-right direction AA. The bottom wall is an arc-shaped bottom wall with a high middle and low ends. The arc-shaped bottom wall helps the oil to be evenly dispersed from the middle to the left and right sides, reducing the retention of oil droplets in the groove, accelerating the flow speed of oil droplets, improving the oil guiding efficiency, and reducing the risk of overflow caused by oil droplet accumulation in the first oil guiding groove 2232a. Furthermore, the bottom wall of the first oil guide groove 2232a is an arc-shaped bottom wall, which allows the oil dripping onto the bottom wall of the first oil guide groove 2232a to first flow to the bottom wall of the first oil guide groove 2232a, and then flow along the arc-shaped bottom wall to the left and right sides, directly dripping onto the left rectifier 12a and the right rectifier 12b, simplifying the collection path. like Figure 23 As shown, in one embodiment, along the left-right direction AA, the bottom surface of the slotted plate 2232 is an arc-shaped bottom surface with a higher middle and lower ends. The arc-shaped bottom surface reduces the resistance of the sucked-in fumes when they come into contact with the slotted plate 2232 during the upward process, making the rising fumes easier to be sucked in and improving the fume extraction efficiency. Reducing resistance can also reduce noise caused by airflow turbulence, creating a quieter operating environment for the user. In one embodiment, the left edge region of the oil receiving base plate 221 also has a left-side oil guide groove, which extends in the front-to-back direction BB to guide oil droplets from the connecting flange 22 to the left-side rectifier 12a. The end of the left-side oil guide groove near the connecting plate 2231 is located above the left-side rectifier 12a, allowing the oil contamination in the left-side oil guide groove to drip directly onto the upper surface of the left-side rectifier 12a. The left-side oil guide groove concentrates oil contamination in an easily observable and cleanable area, simplifying subsequent maintenance and cleaning. In one embodiment, the right edge region of the oil receiving base plate 221 also has a right-side oil guide groove, which extends in the front-to-back direction BB to guide oil droplets from the connecting flange 22 to the right-side rectifier 12b. The end of the right-side oil guide groove near the connecting plate 2231 is located above the right-side rectifier 12b, allowing the oil contamination in the right-side oil guide groove to drip directly onto the upper surface of the right-side rectifier 12b. The right-side oil guide groove concentrates oil contamination in an easily observable and cleanable area, simplifying subsequent maintenance and cleaning. In one embodiment, the front edge region of the oil receiving base plate 221 also has a front oil guiding groove, which extends in the left-right direction AA, i.e., is positioned opposite to the first oil guiding groove 2232a, and is connected to the left oil guiding groove and / or the right oil guiding groove, providing a continuous flow path for oil contaminants and ensuring that oil contaminants flow smoothly from the front edge of the oil receiving base plate 221 to both sides. The presence of the front oil guiding groove reduces the accumulation of oil contaminants at the front edge of the oil receiving base plate 221, reducing the risk of oil droplet overflow or leakage. Through the front oil guiding groove, oil contaminants can be guided more quickly from the front edge of the oil receiving base plate 221 to the second oil guiding grooves on both sides, improving oil guiding efficiency. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application 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, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "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 expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. 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. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A smoke collection assembly, characterized in that, Applied to range hoods, the smoke collection assembly includes: A smoke collection hood includes a smoke collection chamber, an upper smoke inlet, a lower smoke inlet, and a connecting port. The upper smoke inlet, the lower smoke inlet, and the connecting port are all connected to the smoke collection chamber. The upper smoke inlet is higher than the lower smoke inlet. The connecting port is used to connect to the frame assembly of the range hood. A rectifier is disposed in the smoke collection chamber and divides the smoke collection chamber into an auxiliary air duct and a main air duct. The auxiliary air duct connects the upper smoke inlet and the connecting port, and the main air duct connects the lower smoke inlet and the connecting port.

2. The smoke collection assembly according to claim 1, characterized in that, The upper smoke inlet includes an upper left smoke inlet and an upper right smoke inlet; the number of rectifiers is two, and the two rectifiers are as follows: A left-side rectifier is disposed in the smoke collection chamber and defines a left-side auxiliary air duct between itself and the smoke collection hood. The left-side auxiliary air duct connects the upper left smoke inlet and the connecting port. as well as A right-side rectifier and a left-side rectifier are respectively disposed in the smoke collection chamber along the left-right direction. A right-side auxiliary air duct is defined between the right-side rectifier and the smoke collection hood. The right-side auxiliary air duct connects the upper right smoke inlet and the connecting port. The main air duct is defined between the left-side rectifier, the right-side rectifier, and the smoke collection hood. The main air duct connects the lower smoke inlet and the connecting port. The auxiliary air duct includes the left-side auxiliary air duct and the right-side auxiliary air duct.

3. The smoke collection assembly according to claim 2, characterized in that, The smoke hood includes a front panel, a left side panel, a back panel, and a right side panel connected in sequence. The left side panel and the right side panel are arranged opposite each other from left to right, and the front panel and the back panel are arranged opposite each other from front to back. The front panel, the left side panel, the back panel, and the right side panel form the smoke collection chamber; The left-side rectifier, part of the front panel, part of the left-side plate, and part of the back panel constitute the left-side auxiliary air duct; The right-side rectifier, part of the front panel, part of the right-side plate, and part of the back panel constitute the right-side auxiliary air duct; The upper left smoke inlet is located at the upper left corner of the left side panel and / or the front panel, and the upper right smoke inlet is located at the upper right corner of the right side panel and / or the front panel.

4. The smoke collection assembly according to claim 3, characterized in that, Both the upper left smoke inlet and the upper right smoke inlet extend horizontally.

5. The smoke collection assembly according to claim 4, characterized in that, The smoke hood also has a left smoke inlet and a right smoke inlet. The left smoke inlet is located on the left side panel or the left side area of ​​the front panel, and the right smoke inlet is located on the right side panel or the right side area of ​​the front panel. Along the vertical direction, the left smoke inlet extends between the upper left smoke inlet and the lower smoke inlet, and the right smoke inlet extends between the upper right smoke inlet and the lower smoke inlet; the left auxiliary air duct is also connected to the left smoke inlet; the right auxiliary air duct is also connected to the right smoke inlet.

6. The smoke collection assembly according to claim 5, characterized in that, The left smoke inlet and the upper left smoke inlet are both located on the front panel, and the left smoke inlet and the upper left smoke inlet are connected; the right smoke inlet and the upper right smoke inlet are both located on the front panel, and the right smoke inlet and the upper right smoke inlet are connected.

7. The smoke collection assembly according to claim 6, characterized in that, The connection between the left smoke inlet and the upper left smoke inlet is located at the upper left corner of the front panel, and the connection between the right smoke inlet and the upper right smoke inlet is located at the upper right corner of the front panel.

8. The smoke collection assembly according to claim 5, characterized in that, The left smoke inlet is connected to the lower smoke inlet, and the right smoke inlet is connected to the lower smoke inlet.

9. The smoke collection assembly according to claim 5, characterized in that, The bottom end of the left auxiliary air duct is separated from the main air duct, and the bottom end of the right auxiliary air duct is separated from the main air duct; or The bottom end of the left auxiliary air duct is connected to the main air duct, and the bottom end of the right auxiliary air duct is connected to the main air duct.

10. The smoke collection assembly according to claim 3, characterized in that, The left rectifier includes a left rectifier section and a left guide section that are connected to each other and arranged at an angle. The left rectifier section extends upward from left to right at an angle, and the left guide section extends upward from left to right from the end of the left rectifier section away from the left side plate and toward the communication port. The right-side rectifier includes a right-side rectifier section and a right-side guide section that are connected to each other and arranged at an angle. The right-side rectifier section extends upward at an angle from right to left, and the right-side guide section extends upward at an angle from right to left from the end of the right-side rectifier section away from the right-side plate and toward the communication port.

11. The smoke collection assembly according to claim 10, characterized in that, Along the bottom-up direction, the first distance D1 between the left rectifier section and the right rectifier section in the left-right direction gradually decreases; Along the bottom-up direction, the second distance D2 between the left guide section and the right guide section in the left-right direction gradually decreases, and the rate of decrease of the first distance D1 is greater than the rate of decrease of the second distance D2.

12. The smoke collection assembly according to claim 10, characterized in that, The left rectifier section is sealed to both the front panel and the back panel, and the left end of the left rectifier section is sealed to or spaced apart from the left side panel; the left guide section is sealed to both the front panel and the back panel. The right-side rectifier section is sealed to both the front panel and the back panel, and the right end of the right-side rectifier section is sealed to or spaced apart from the right-side panel; the right-side guide section is sealed to both the front panel and the back panel.

13. The smoke collection assembly according to claim 10, characterized in that, The left rectifier section, the left guide section, the right rectifier section, and the right guide section are each a flat plate or an arc-shaped plate.

14. The smoke collection assembly according to claim 10, characterized in that, The left rectifier also includes a left flow stabilizing section, which is connected to the end of the left guide section away from the left rectifier section, and the left flow stabilizing section extends from bottom to top toward the communication port. The right-side rectifier also includes a right-side flow stabilizing section, which is connected to the end of the right-side guide section away from the right-side rectifier section, and extends from bottom to top toward the communication port.

15. The smoke collection assembly according to claim 14, characterized in that, The left-side rectifier meets one of the following conditions: the left-side rectifier section and the left-side guide section are arranged with an arc transition; The left-side guide section and the left-side stabilizing section are arranged with an arc transition; Along the vertical direction, the left-side stabilizing section has a first height H1, where H1 ≥ 5 mm; and / or, The right-side rectifier meets one of the following conditions: The right-side rectifier section and the right-side guide section are arranged with an arc transition; The right-side guide section and the right-side stabilizing section are arranged with an arc transition; Along the vertical direction, the right-side stabilizing section has a second height H2, where H2 ≥ 5 mm.

16. The smoke collection assembly according to claim 1, characterized in that, The rectifier is at least partially rotatable relative to the smoke hood, such that at least one of the auxiliary air duct and the main air duct is in communication with the connection port.

17. The smoke collection assembly according to claim 16, characterized in that, The rectifier includes a rectifier section and a guide section that are rotatably connected to each other, so that the guide section can rotate relative to the smoke hood and isolate or connect the auxiliary air duct and the communication port.

18. The smoke collection assembly according to claim 17, characterized in that, The smoke collection assembly also includes a lower opening and closing component, which is movably connected to the smoke collection hood to open or close the lower smoke inlet. or, The smoke collection hood includes an upper cover and a lifting cover. The lower smoke inlet is located in the lifting cover. The lifting cover can be raised and lowered relative to the upper cover to open or close the lower smoke inlet.

19. The smoke collection assembly according to claim 18, characterized in that, The smoke collection assembly has an upper single-suction mode, a lower single-suction mode, and an upper and lower dual-suction mode. When the smoke collection assembly is in the upper single suction mode, the guide section rotates relative to the smoke collection hood to the first guiding position to guide the auxiliary air duct and the connecting port. The lower opening and closing member closes the lower smoke inlet or the lifting shell moves upward to close the lower smoke inlet. When the smoke collection assembly is in the single-suction mode, the guide section rotates relative to the smoke collection hood to the closed position to close the auxiliary air duct and the connecting port, and the lower opening and closing member opens the lower smoke inlet or the lifting shell moves downward to open the lower smoke inlet; When the smoke collection assembly is in the upper and lower dual-suction mode, the guide section rotates relative to the smoke collection hood to the second open position to connect the auxiliary air duct and the communication port. The lower opening and closing member opens the lower smoke inlet or the lifting shell moves downward to open the lower smoke inlet. In the rotation direction of the guide section, the second open position is located between the first open position and the closed position.

20. The smoke collection assembly according to claim 19, characterized in that, The angle between the rectifying section and the guiding section is α; When the guide section is in the first conductive position, α≥180; When the guide section is in the closed position, α ≤ 90°; When the guide section is in the second conduction position, 90° < α < 180°.

21. The smoke collection assembly according to claim 19, characterized in that, The upper smoke inlet includes an upper left smoke inlet and an upper right smoke inlet; the number of rectifiers is two, and the two rectifiers are as follows: A left-side rectifier is disposed in the smoke collection chamber and defines a left-side auxiliary air duct between itself and the smoke collection hood. The left-side auxiliary air duct connects the upper left smoke inlet and the connecting port. as well as A right-side rectifier and a left-side rectifier are respectively disposed in the smoke collection chamber along the left and right directions. A right-side auxiliary air duct is defined between the right-side rectifier and the smoke collection hood. The right-side auxiliary air duct connects the upper right smoke inlet and the connecting port. The main air duct is defined by the left rectifier, the right rectifier, and the smoke hood, and the main air duct connects the lower smoke inlet and the connecting port; the auxiliary air duct includes the left auxiliary air duct and the right auxiliary air duct; the left rectifier includes a left rectifier section and a left guide section that are rotatably connected to each other, the right rectifier includes a right rectifier section and a right guide section that are rotatably connected to each other, the left rectifier section includes the left rectifier section and the right rectifier section, and the guide section includes the left guide section and the right guide section; In the closed position, the second distance D2 between the left guide section and the right guide section in the left-right direction gradually decreases from top to bottom.

22. The smoke collection assembly according to claim 21, characterized in that, The left rectifier also includes a left flow stabilizing section, which is connected to the end of the left guide section opposite to the left rectifier section; The right-side rectifier also includes a right-side flow stabilizing section, which is connected to the end of the right-side guide section opposite to the right-side rectifier section. In the closed position, the third distance D3 between the left and right flow stabilizing sections gradually decreases in the left-right direction along the top-to-bottom direction.

23. The smoke collection assembly according to claim 19, characterized in that, Also includes: The upper opening and closing component is movably connected to the smoke collection hood to open or close the upper smoke inlet; When the smoke collection assembly is in the upper single-suction mode or the upper and lower double-suction mode, the upper opening and closing component opens the upper smoke inlet; when the smoke collection assembly is in the lower single-suction mode, the upper opening and closing component closes the upper smoke inlet.

24. The smoke collection assembly according to claim 1, characterized in that, The smoke hood includes a front panel, the upper smoke inlet is disposed on the front panel, and the upper smoke inlet extends horizontally to form a strip shape; The number of rectifiers is one, and the rectifier is a long strip-shaped rectifier extending from left to right. The long strip-shaped rectifier divides the smoke collection chamber into the main air duct and the auxiliary air duct in the front-to-back direction. The auxiliary air duct is the upper front space of the smoke collection chamber.

25. A range hood, characterized in that, include: Rack components; as well as The smoke collection assembly as described in any one of claims 1-24 is disposed below the frame assembly, and the communication port connects the smoke collection chamber and the frame assembly; In the vertical direction of the range hood, the projection of the rectifier overlaps with the projection of the connecting port.

26. The range hood according to claim 25, characterized in that, The upper smoke inlet includes an upper left smoke inlet and an upper right smoke inlet; the number of rectifiers is two, and the two rectifiers are as follows: A left-side rectifier is disposed in the smoke collection chamber and defines a left-side auxiliary air duct between itself and the smoke collection hood. The left-side auxiliary air duct connects the upper left smoke inlet and the connecting port. as well as A right-side rectifier and a left-side rectifier are respectively disposed in the smoke collection chamber along the left and right directions. A right-side auxiliary air duct is defined between the right-side rectifier and the smoke collection hood. The right-side auxiliary air duct connects the upper right smoke inlet and the connecting port. The main air duct is defined by the left rectifier, the right rectifier, and the smoke hood. The main air duct connects the lower smoke inlet and the connecting port. The auxiliary air duct includes the left auxiliary air duct and the right auxiliary air duct. The minimum distance between the left rectifier and the right rectifier in the left-right direction is a fourth distance D4. The left and right walls of the connecting port have a fifth distance D5, where D4 < D5.

27. The range hood according to claim 25, characterized in that, The rectifier includes: First rectifier board; and The second rectifier plate is connected to the first rectifier plate to jointly form a sound-absorbing cavity; The first rectifier plate and / or the second rectifier plate have silencing holes that communicate with the silencing cavity.

28. The range hood according to claim 27, characterized in that, The rectifier also includes: A noise reduction component is disposed within the noise reduction cavity.

29. The range hood according to claim 25, characterized in that, The rack assembly includes: frame; A connecting flange is attached to the bottom end of the frame and together with the frame forms the fan cavity, the fan cavity communicating with the connecting port; and A fan is located inside the fan cavity and above the connecting flange; In the vertical direction of the range hood, the projection of the rectifier and the projection of the connecting flange partially overlap inside the communication port, so that oil droplets from the connecting flange drip through the communication port onto the upper surface of the rectifier.

30. The range hood according to claim 29, characterized in that, The upper smoke inlet includes an upper left smoke inlet and an upper right smoke inlet; the number of rectifiers is two, and the two rectifiers are as follows: A left-side rectifier is disposed in the smoke collection chamber and defines a left-side auxiliary air duct between itself and the smoke collection hood. The left-side auxiliary air duct connects the upper left smoke inlet and the connecting port. as well as A right-side rectifier and a left-side rectifier are respectively disposed in the smoke collection chamber along the left and right directions. A right-side auxiliary air duct is defined between the right-side rectifier and the smoke collection hood. The right-side auxiliary air duct connects the upper right smoke inlet and the connecting port. The main air duct is defined by the left rectifier, the right rectifier, and the smoke hood. The main air duct connects the lower smoke inlet and the connecting port. The auxiliary air duct includes the left auxiliary air duct and the right auxiliary air duct. The left rectifier is inclined downward from right to left and from front to back. The right rectifier is inclined downward from left to right and from front to back.

31. The range hood according to claim 30, characterized in that, The smoke collection hood includes a left side panel and a right side panel, which are arranged opposite each other from left to right. The left rectifier includes a left rectifier section and a left guide section that are connected to each other and arranged at an angle. The left rectifier section extends upward from left to right at an angle, and the left guide section extends upward from left to right from the end of the left rectifier section away from the left side plate and toward the communication port. The right-side rectifier includes a right-side rectifier section and a right-side guide section that are connected to each other and arranged at an angle. The right-side rectifier section extends upward from right to left at an angle, and the right-side guide section extends upward from right to left from the end of the right-side rectifier section away from the right-side plate and toward the communication port. The projections of the left and right guide sections along the vertical direction both fall at least partially into the connecting opening.

32. The range hood according to claim 31, characterized in that, The left rectifier also includes a left flow stabilizing section, which is connected to the end of the left guide section away from the left rectifier section, and the left flow stabilizing section extends from bottom to top toward the communication port. The right-side rectifier also includes a right-side flow stabilizing section, which is connected to the end of the right-side guide section away from the right-side rectifier section, and the right-side flow stabilizing section extends from bottom to top toward the communication port. The projections of the left and right flow-stabilizing sections along the vertical direction both fall into the connecting port.

33. The range hood according to claim 32, characterized in that, Along the left-right direction, there is a sixth distance D6 between the left-side stabilizing section and the left wall of the connecting port, where 25mm ≤ D6 ≤ 35mm; and / or, Along the left-right direction, there is a seventh distance D7 between the right-side stabilizing section and the right wall of the connecting port, where 25mm≤D7≤35mm.

34. The range hood according to claim 30, characterized in that, The connecting flange has a first oil guide groove located in the smoke collection chamber. The first oil guide groove extends in the left-right direction to guide the oil droplets of the connecting flange to the left rectifier and the right rectifier.

35. The range hood according to claim 34, characterized in that, The connecting flange includes: An oil receiving base plate is located below the fan and is inclined downwards from front to back; A surrounding panel, connected to the frame and the smoke collection hood, and surrounding the periphery of the oil receiving base plate, wherein a guide opening is formed between the rear sidewall of the surrounding panel and the rear sidewall of the oil receiving base plate, the guide opening being inserted into the communication opening to communicate with the smoke collection chamber; and, An oil guide component is connected to the oil receiving base plate and located within the guide port, and has the first oil guide groove.

36. The range hood according to claim 35, characterized in that, The oil guide component includes: A connecting plate, connected to the rear sidewall of the oil receiving base plate, and extending downwards from the oil receiving base plate into the smoke collection chamber; and A slotted plate is connected to the bottom end of the connecting plate and has the first oil guide groove.

37. The range hood according to claim 36, characterized in that, The first oil guide groove has a bottom wall, which is an arc-shaped bottom wall with a higher middle and lower ends along the left-right direction.

38. The range hood according to claim 36, characterized in that, Along the left-right direction, the bottom surface of the slotted plate is an arc-shaped bottom surface that is higher in the middle and lower at both ends.

39. The range hood according to claim 35, characterized in that, The left edge region of the oil receiving base plate also has a left-side oil guide groove, which extends in the front-to-back direction to guide oil droplets from the connecting flange to the left-side rectifier; and / or, The right edge region of the oil receiving base plate also has a right-side oil guide groove, which extends in the front-back direction to guide the oil droplets from the connecting flange to the right-side rectifier.

40. The range hood according to claim 39, characterized in that, The front edge area of ​​the oil receiving base plate also has a front oil guide groove, which extends in the left-right direction and communicates with the left oil guide groove and / or the right oil guide groove.

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