Range hood

Abstract

The invention provides an improved range hood. The range hood comprises a machine shell, an airflow channel is formed in the machine shell, the airflow channel comprises an air inlet with a downward opening, and an airflow inlet is formed in the front side wall of the machine shell; a jet generator is arranged on the inner side of the front side wall of the machine shell and arranged to be suitable for generating air curtain airflow for preventing lampblack from escaping and / or injection airflow for guiding the lampblack to flow into the air inlet. The airflow inlet is arranged to be suitable for conveying air to the jet flow generator. Therefore, the jet generator is embedded in the machine shell, and the hiding effect is good.

Description

[Technical field]

[0001] The present application relates to the field of range hoods. [Background technology]

[0002] In Asia, due to the traditional cooking habit of stir-frying, the oil content in the smoke produced during cooking is particularly high. Therefore, the range hood used to extract the oil smoke produced during cooking has become an important household appliance that is indispensable in daily life. As people's requirements for the quality of life continue to improve, the range hood is also constantly upgraded and improved. At present, a range hood with a jet generator has been proposed. However, the existing range hood solution with a jet generator has poor integration and needs to be further improved.

[0003] In addition, the existing range hood fume extraction efficiency needs to be improved. Reducing the escape of oil smoke is also a technical problem that needs to be solved urgently in this field. Furthermore, a range hood solution using a cyclone filter has been proposed, such as the U.S. patent No. US4872892. In the existing solutions, the technical focus is mostly on the cyclone filter itself, which is relatively limited. It can be said that the existing range hood solutions using cyclone filters are relatively single. Moreover, the range hoods used for existing cyclone filters are mainly side-suction range hoods, which to a certain extent limits the application space of cyclone filters in the field of range hoods.

[0004] Unless there is sufficient evidence to support it, the prior art described herein does not mean that the prior art is known to ordinary technicians in the field involved in this application before the filing date of this application. [Summary of the invention]

[0005] One purpose of the embodiments of the present application is to provide an improved range hood in view of at least one of the above technical problems and / or other possible technical problems not mentioned in the present application.

[0006] One embodiment of the present application relates to a range hood, comprising a casing, wherein an air flow channel is arranged in the casing, the air flow channel includes an air inlet opening open downward, and an air flow inlet is arranged on the front side wall of the casing; a jet generator is arranged on the inner side of the front side wall of the casing, and is configured to be suitable for generating a wind curtain airflow to prevent oil smoke from escaping and / or an induced airflow to guide oil smoke to flow into the air inlet; the air flow inlet is configured to be suitable for conveying air to the jet generator.

[0007] An air flow inlet is arranged on the front side wall of the casing; a jet generator is arranged on the inner side of the front side wall of the casing; the air flow inlet is configured to be suitable for conveying air to the jet generator; thereby, the conventional setting of the jet generator used for the range hood is broken through, the jet generator is embedded in the casing, and the concealment effect is good.

[0008] In one or some embodiments, the housing includes an airflow outlet; the airflow outlet is configured to be suitable for the jet generator to output airflow; the airflow outlet is a through hole or a notch provided on the front side wall of the housing. Thus, the jet generator and the housing are well integrated.

[0009] In one or some embodiments, it includes a smoke guide plate; the free end of the smoke guide plate is provided with an enlarged head; the jet generator is configured to generate an airflow that flows sequentially along the upper surface of the smoke guide plate, the outer surface of the enlarged head and the lower surface of the smoke guide plate and flows toward the air inlet.

[0010] In one or some embodiments, the outer cover of the enlarged head is provided with an outer shell, and an airflow duct is formed between the outer shell and the enlarged head; an airflow inlet is formed along the upper end of the outer shell and the upper surface of the smoke guide plate; an airflow outlet is formed along the lower end of the outer shell and the lower surface of the smoke guide plate; the airflow inlet is one pipe opening of the airflow duct, and the airflow outlet is another pipe opening of the airflow duct.

[0011] In one or some embodiments, the housing has a cross-section that is "C"-shaped with its opening facing the jet generator; and / or

[0012] Both left and right ends of the airflow pipeline are closed; and / or

[0013] The airflow inlet and the airflow outlet are the only openings of the airflow pipeline that are connected to the external space; and / or

[0014] A reinforcing rib is provided in the airflow pipeline, and the reinforcing rib divides the airflow pipeline into at least two parts; and / or

[0015] The outer surface of the enlarged head is in a water drop shape.

[0016] In one or some embodiments, the jet generator is configured to eject the airflow toward the upper surface of the smoke guide plate at a downward pressure angle α, 10°≤α≤45°; and / or

[0017] The smoke guide plate extends in a horizontal direction; and / or

[0018] The flow direction of the airflow flowing out of the airflow outlet changes 180 degrees after flowing through the outer surface of the enlarged head, and then flows toward the air inlet.

[0019] The jet generator is configured to eject the airflow toward the upper surface of the smoke guide plate at a downward pressure angle α, 10°≤α≤45°; thereby, it helps to ensure that the airflow output from the airflow outlet of the jet generator flows forward along the upper surface of the smoke guide plate.

[0020] In one or some embodiments, the smoke guide plate is configured to switch between a first position and a second position along its extension direction; when the smoke guide plate is in the first position, the smoke guide plate is completely or partially embedded in the housing, and the smoke guide plate completely or partially closes the air inlet; when the smoke guide plate is in the second position, the smoke guide plate is completely or partially moved forward out of the housing to form an eaves. When the smoke guide plate is in the first position, the smoke guide plate is completely or partially embedded in the housing; thus, when the smoke guide plate is in the first position, the smoke guide plate is at least partially hidden, thereby ensuring the oil fume extraction function while reducing the space occupied by the range hood.

[0021] In one or some embodiments, a centrifugal fan and a cyclonic filter are sequentially arranged from top to bottom, and both are arranged in the housing; when the smoke guide plate is in the first position, the cyclonic filter is located directly above the smoke guide plate; when the smoke guide plate is in the second position, the jet generator is configured to be suitable for delivering an induced airflow to the cyclonic filter. The clever combination of the centrifugal fan, the jet generator and the cyclonic filter helps to improve the efficiency of oil fume extraction.

[0022] In one or some embodiments, when the smoke guide plate is located at the first position, the housing and the smoke guide plate are both in a rectangular parallelepiped shape as a whole; and / or

[0023] The cyclone filter device is arranged obliquely in the housing, and a first exhaust port is provided at one end of the cyclone duct tilted upward, and the first exhaust port faces the front side wall of the housing; and / or

[0024] The cyclone filter device comprises a plurality of cyclone ducts arranged side by side; and / or

[0025] An air inlet is provided on the wall of the cyclone duct, and the air inlet is open toward the air inlet located below it; and / or

[0026] The first exhaust port is placed on the jet generator.

[0027] When the smoke guide plate is located at the first position, the casing and the smoke guide plate are both in a rectangular shape as a whole; therefore, when the smoke guide plate is located at the first position, the smoke guide plate is hidden, which ensures the oil fume extraction function while reducing the space occupied by the range hood, making it easy to embed the range hood in the cabinet, thereby improving the integration effect of the range hood and the cabinet.

[0028] The cyclone filter device is arranged obliquely in the casing, and a first exhaust port is provided at the upwardly tilted end of the cyclone duct, and the first exhaust port faces the front side wall of the casing; thus, the centrifugal fan, the jet generator and the cyclone filter device are cleverly coordinated to help improve the efficiency of oil fume extraction.

[0029] In one or some embodiments, the airflow outlet is arranged directly below the airflow inlet; and / or

[0030] The bottom edge of the housing is the bottommost end of the range hood; and / or

[0031] The air inlet is located at the bottom of the range hood; and / or

[0032] The front side wall of the housing extends in a vertical direction; and / or

[0033] comprising a smoke guide plate, wherein the bottom edge of the front side wall of the housing is spaced from the upper surface of the smoke guide plate to form the airflow outlet; and / or

[0034] The jet generator comprises a shell and a cross-flow impeller arranged in the shell. The shell is attached to the inner surface of the front side wall of the casing. The cross-flow impeller is isolated from the oil fume airflow in the airflow channel.

[0035] It should be noted here that directional expressions such as "above", "directly below", "bottommost end", "bottom edge" etc. appearing in this application, unless otherwise specified, are based on the usual usage state of the range hood.

[0036] It should be pointed out here that the “first” and “second” appearing in this specification are only used for descriptive purposes and are not used to indicate relative importance; moreover, they are not a definition of the quantity of the features they define; in addition, they are not a definition of the logical or sequential relationship of the features they define.

[0037] The above technical solutions of the present application are not intended to describe all possible implementations of the present application. Throughout the application, guidance is provided by listing examples in many places, and these examples can be used in various feasible combinations.

Brief Description of the Drawings

[0038] The following drawings are only used to illustrate and explain the present application, and do not limit the scope of the present application, wherein:

[0039] Figure 1 It is a structural schematic diagram of a range hood embodiment of the present application;

[0040] Figure 2 yes Figure 1 A diagram showing a changing state of the range hood embodiment shown;

[0041] Figure 3 yes Figure 2 A cross-sectional view of the range hood embodiment shown;

[0042] Figure 4 yes Figure 2 Another cross-sectional view of the range hood embodiment shown;

[0043] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0044] Figure 6 yes Figure 2 Another cross-sectional view of the range hood embodiment shown;

[0045] Figure 7 yes Figure 6 A partial enlarged view of the middle A;

[0046] Figure 8 It is a partial structural schematic diagram of a range hood embodiment of the present application.

[0047] Reference numerals:

[0048] 1- housing, 2- front side wall, 3- air flow inlet, 4- air flow outlet, 5- smoke guide plate, 6- enlarged head, 7- housing, 8- reinforcing ribs, 9- cyclone filter device, 10- first exhaust port, 11- housing member, 12- cross-flow impeller, 13- volute tongue, 14- centrifugal fan, 15- air duct seat, 16- electrical box, 17- upper end edge, 18- lower end edge. [Specific implementation method]

[0049] In order to make the purpose, scheme and beneficial effects of the present application more clear, the present application is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0050] The present application proposes an embodiment of a range hood, comprising a housing 1, a smoke guide plate 5, a centrifugal fan 14, a jet generator, a cyclonic filter device 9, a drive module, an oil cup, an air duct seat 15 and an electrical box 16, as shown in FIG. Figures 1 to 8 The air duct seat 15 and the electrical appliance box 16 are both arranged on the top wall of the housing 1. The range hood is a top suction range hood.

[0051] The housing 1 is provided with an air flow channel, which includes an air inlet opening facing downward. Figure 1 and 2 As shown. The air inlet is located at the bottom of the range hood. The bottom edge of the housing 1 is used as the edge of the air inlet.

[0052] The jet generator is arranged on the inner side of the front side wall 2 of the housing 1. The jet generator is arranged to generate an induced airflow to guide the oil smoke into the air inlet. The front side wall 2 of the housing 1 is provided with an airflow inlet 3, such as Figures 1 to 3 As shown. The air inlet 3 passes through the jet generator. The air inlet 3 is configured to be suitable for conveying air to the jet generator. Specifically, when the jet generator is running, air flows into the jet generator through the air inlet 3, and the air is processed by the jet generator to form an induced airflow.

[0053] The housing 1 includes an airflow outlet 4. The airflow outlet 4 is configured to be suitable for the jet generator to output the induced airflow. The airflow outlet 4 is a notch provided in the front side wall 2 of the housing 1. Specifically, the bottom edge of the front side wall 2 of the housing 1 is spaced apart from the upper surface of the smoke guide plate 5 to form the airflow outlet 4. Figures 3 to 7 As shown, the front side wall 2 of the housing 1 extends in the vertical direction. The air flow outlet 4 is arranged directly below the air flow inlet 3.

[0054] The free end of the smoke guide plate 5 is provided with an enlarged head 6. The enlarged head 6 is integrally formed with the smoke guide plate 5. Figure 5 As shown. The outer surface of the enlarged head 6 smoothly connects between the upper surface of the smoke guide plate 5 and the lower surface of the smoke guide plate 5. The jet generator is configured to generate an airflow that flows along the upper surface of the smoke guide plate 5, the outer surface of the enlarged head 6 and the lower surface of the smoke guide plate 5 in sequence and flows to the air inlet. In other words, after the airflow generated by the jet generator flows out from the airflow outlet 4, it flows through the upper surface of the smoke guide plate 5, the outer surface of the enlarged head 6 and the lower surface of the smoke guide plate 5 in sequence under the action of the Coanda effect, and then flows to the air inlet. As a result, the flow direction of the airflow flowing out of the airflow outlet 4 changes 180° after flowing through the outer surface of the enlarged head 6, and then flows to the air inlet. Among them, the flow direction of the airflow flowing out of the airflow outlet 4 is to flow forward in the horizontal direction, and the flow direction of the airflow that finally flows to the air inlet is to flow backward in the horizontal direction. It should be explained here that the Coanda Effect is also called the wall attachment effect or the Coanda effect.

[0055] The outer surface of the enlarged head 6 is in the shape of a water drop. Figures 3 to 6As shown, it is configured to achieve the 180° change in the airflow direction based on the Coanda effect. The outer cover of the enlarged head 6 is provided with a shell 7, and an airflow duct is formed between the shell 7 and the enlarged head 6. The upper edge 17 of the shell 7 is spaced from the upper surface of the smoke guide plate 5 to form an airflow inlet, and the lower edge 18 of the shell 7 is spaced from the lower surface of the smoke guide plate 5 to form an airflow outlet. Figure 8 As shown. The airflow inlet is one of the pipe openings of the airflow pipeline, and the airflow outlet is another of the pipe openings of the airflow pipeline. The airflow inlet and the airflow outlet are the only openings of the airflow pipeline that are connected to the external space.

[0056] The housing 7 has a "C" shape in cross section with its opening facing the jet generator, such as Figures 3 to 6 The left and right ends of the air flow pipeline are closed, as shown in Figure 8 shown.

[0057] A reinforcing rib 8 is provided in the air flow pipeline. One end of the reinforcing rib 8 is connected to the outer surface of the enlarged head 6, and the other end is connected to the outer shell 7. Specifically, the number of the reinforcing ribs 8 is four. The four reinforcing ribs 8 divide the air flow pipeline into five parts, such as Figure 8 As shown, the "five parts" are independent of each other.

[0058] The jet generator is configured to direct the airflow toward the upper surface of the smoke guide plate 5 at a downward pressure angle α. Figure 7 In the embodiment shown, the downward pressure angle α=30°. The smoke guide plate 5 extends in the horizontal direction. The jet generator is a cross-flow fan. The cross-flow fan includes a shell member 11 and a cross-flow impeller 12 arranged in the shell member 11. The shell member 11 is attached to the inner surface of the front side wall 2 of the casing 1. The cross-flow impeller 12 is isolated from the oil smoke airflow in the airflow channel; in other words, the oil smoke airflow in the airflow channel will not flow into the shell member 11. The volute tongue 13 of the cross-flow fan is provided with a guide bevel, which makes the airflow generated by the jet generator be directed to the upper surface of the smoke guide plate 5 at a downward pressure angle α; in other words, the angle between the guide bevel and the horizontal plane is α, as shown in FIG. Figure 7 shown.

[0059] The smoke guide plate 5 is configured to be suitable for switching between a first position and a second position along its extension direction. In other words, the smoke guide plate 5 is configured to be suitable for switching between a first position and a second position along a horizontal direction. When the smoke guide plate 5 switches from the first position to the second position, the smoke guide plate 5 moves forward in the horizontal direction. When the smoke guide plate 5 switches from the second position to the first position, the smoke guide plate 5 moves backward in the horizontal direction. It can be seen that the smoke guide plate 5 is movable. Specifically, the smoke guide plate 5 moves under the drive of the driving module. When the smoke guide plate 5 is in the first position, the smoke guide plate 5 is partially embedded in the casing 1, and the smoke guide plate 5 partially closes the air inlet. When the smoke guide plate 5 is in the first position, only the outer shell 7 of the smoke guide plate 5 at its free end is exposed outside the front side wall 2 of the casing 1, such as Figure 1 As shown in FIG. 1 , the housing 7 at the free end of the smoke guide plate 5 blocks the airflow outlet 4, and the housing 1 and the smoke guide plate 5 are in a rectangular parallelepiped shape as a whole. When the smoke guide plate 5 is in the second position, the smoke guide plate 5 partially moves forward out of the housing 1 to form an eaves portion, and the air inlet is completely open. When the smoke guide plate 5 is in the second position, the housing 1 and the smoke guide plate 5 are in an "L" shape as a whole, as shown in FIG. Figure 2 As shown, the housing 7 of the smoke guide plate 5 at its free end is located at the frontmost side of the range hood.

[0060] When the smoke guide plate 5 is in the first position, Figure 1 As shown, the smoke guide plate 5 partially closes the air inlet, which is still open, but smaller than when the smoke guide plate 5 is in the second position. When the smoke guide plate 5 is in the first position, if the centrifugal fan 14 is running, the range hood can still exhaust oil smoke through the air inlet, but it is preferably applied to the case where the oil smoke generated by the cooker is small.

[0061] When the oil smoke generated by the stove is large, in order to exhaust the oil smoke, the smoke guide plate 5 is controlled to switch to the second position, the centrifugal fan 14 is turned on and operated, and the cross-flow fan is turned on and operated at the same time. The operation of the centrifugal fan 14 generates negative pressure at the air inlet, and the induced airflow generated by the cross-flow fan will flow to the air inlet under the action of the Coanda effect, thereby reducing the escape of oil smoke and improving the oil smoke extraction effect.

[0062] When the oil smoke generated by the cooker is of medium size, in order to exhaust the oil smoke, the smoke guide plate 5 is controlled to switch to the second position, the centrifugal fan 14 is turned on, but the cross-flow fan is not turned on.

[0063] When the smoke guide plate 5 is in the second position, the jet generator is configured to generate an airflow that flows sequentially along the upper surface of the smoke guide plate 5, the outer surface of the enlarged head 6 and the lower surface of the smoke guide plate 5 and flows toward the air inlet.

[0064] Slide rails are provided on both sides of the smoke guide plate 5. The slide rails are connected between the smoke guide plate 5 and the housing 1. When the smoke guide plate 5 switches between the first position and the second position, the smoke guide plate 5 slides along the slide rails.

[0065] The driving module is configured to drive the smoke guide plate 5 to switch between the first position and the second position. Specifically, the driving module is configured to drive the smoke guide plate 5 to make a linear motion and switch between the first position and the second position. The driving module includes a motor, a first gear, a second gear and a rack. The rack is arranged on the top wall of the smoke guide plate 5. The motor is configured to drive the first gear to rotate. The rotating first gear drives the rack to move, and the smoke guide plate 5 moves with the rack. Specifically, the second gear is connected and arranged between the first gear and the rack. The second gear is meshed with both the first gear and the rack. The rotating first gear drives the second gear to rotate, and the rotating second gear drives the rack to move. The diameter of the second gear is larger than the diameter of the first gear.

[0066] The smoke guide plate 5 includes a glass top plate, and the rack is integrally formed on the glass top plate. Specifically, the rack can be processed by rolling in the process of forming the glass top plate; the rack can be processed by rolling after the glass top plate is heated and softened; or the rack can be directly formed on the glass top plate by CNC technology.

[0067] The centrifugal fan 14, the cyclonic filter device 9 and the jet generator are all arranged in the housing 1, and are arranged in sequence from top to bottom. Figures 3 to 6 As shown. The cyclone filter device 9 is located below the centrifugal fan 14. The jet generator is located below the cyclone filter device 9. When the smoke guide plate 5 is in the first position, the cyclone filter device 9 is located directly above the smoke guide plate 5. When the smoke guide plate 5 is in the second position, the jet generator is configured to be suitable for delivering an induced airflow to the cyclone filter device 9; specifically, the induced airflow generated by the jet generator flows along the upper surface of the smoke guide plate 5, the outer surface of the enlarged head 6 and the lower surface of the smoke guide plate 5 in sequence and flows to the air inlet, and then flows to the cyclone filter device 9.

[0068] A first exhaust port 10 is disposed at one end of the cyclone duct that is tilted upward, and the first exhaust port 10 faces the front side wall 2 of the housing 1. Figures 3 to 6 As shown. An air inlet is arranged on the wall of the cyclone duct, and the air inlet is open toward the air inlet located below it. The first exhaust port 10 is placed on the jet generator.

[0069] The cyclone filter device 9 is arranged obliquely in the housing 1. The inclination angle of the cyclone filter device 9 is an acute angle. Preferably, the inclination angle of the cyclone filter device 9 is equal to 15°. Figures 3 to 6 shown.

[0070] The cyclone filter device 9 comprises a plurality of cyclone pipes arranged side by side. Each cyclone pipe is roughly cylindrical. Preferably, the cyclone filter device 9 adopts an integrally formed structure. For example, the cyclone filter device 9 is made of a plastic material in an integrally formed structure.

[0071] The air inlets of the cyclone ducts are parallel to each other, and the air inlets of the cyclone ducts extend along the inclined direction of the cyclone filter device 9. It should be noted that the first exhaust port 10 is provided at one end of the cyclone duct, and the other end of the cyclone duct can be substantially closed with only an oil leakage hole or a second exhaust port. The other end of the cyclone duct is provided above the oil cup, such as Figure 3 The oil cup is used to collect the grease dripping from the other end of the cyclone pipe. The oil cup is long and fixed to the rear wall of the housing 1. Figure 1 , 2 , 3, 4 and 6. The oil cup is located directly behind the jet generator. The oil cup is blocked in the horizontal direction by the housing 1 and the smoke guide plate 5 located in front of it.

[0072] The first exhaust port 10 faces the front side wall 2 of the housing 1. Figures 3 to 6 The first exhaust port 10 is an inclined cutout that opens toward the front side wall 2 of the housing 1. It should be noted that the term "inclined cutout" is only a figurative expression; specifically, there are many possible ways to form the "inclined cutout", and it is not necessarily formed by a cutting process.

[0073] The cyclone filter device 9 includes an integral extension surface, and the air inlet is integrally formed on the integral extension surface. The integral extension surface is the bottom outer surface of the cyclone filter device 9. Specifically, the integral extension surface is an integral plane, and the air inlet is integrally formed on the integral plane. The inclination angle of the integral plane is an acute angle, preferably, the inclination angle of the integral plane is equal to 15°, such as Figure 2 As shown, the integrated plane is inclined downward from front to back toward the oil cup, and the rear end edge of the integrated plane is located above the oil cup.

[0074] The rear end of the integral plane is integrally formed with a flange, the flange is close to the rear side wall of the housing 1, and the flange is fixed to the rear side wall of the housing 1 by screws, such as Figure 3 , 4 and 6.

[0075] Exemplarily, the air flow outlet may also be a through hole provided on the front side wall of the casing.

[0076] Exemplarily, the jet generator may be configured to generate an air curtain airflow to prevent the escape of oil smoke. For example, the jet generator sprays airflow downward to form an air curtain that at least partially surrounds the cooking area, and the air curtain is suitable for preventing the escape of oil smoke generated by the stove in the cooking area.

[0077] Exemplarily, it may also be that when the smoke guide plate is located at the first position, the smoke guide plate is completely or partially embedded in the casing, and the smoke guide plate completely closes the air inlet. Preferably, at this time, the rear end edge of the smoke guide plate abuts against the oil cup.

[0078] The components of different embodiments may be combined with each other in any feasible manner to achieve the purpose of this application.

[0079] The above are only optional embodiments of some implementation scenarios of the present application. It should be noted that, for ordinary technicians in this technical field, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the technical concept of the present application also fall within the protection scope of the present application.

Claims

1. A range hood, comprising a housing (1), wherein an air flow channel is provided in the housing (1), wherein the air flow channel comprises an air inlet opening facing downward, wherein: An air flow inlet (3) is provided on the front side wall (2) of the housing (1); A jet generator is arranged on the inner side of the front side wall (2) of the housing (1), and is configured to generate an air curtain airflow to prevent the escape of oil smoke and / or an induced airflow to guide the oil smoke to flow into the air inlet; The air flow inlet (3) is configured to be suitable for conveying air to the jet generator.

2. The range hood according to claim 1, characterized in that: The housing (1) comprises an air flow outlet (4); The airflow outlet (4) is configured to be suitable for the jet generator to output airflow; The air flow outlet (4) is a through hole or a notch arranged on the front side wall (2) of the housing (1).

3. The range hood according to claim 2, characterized in that: It includes a smoke guide plate (5); The free end of the smoke guide plate (5) is provided with an enlarged head (6); The jet generator is configured to generate an airflow that flows sequentially along the upper surface of the smoke guide plate (5), the outer surface of the enlarged head (6) and the lower surface of the smoke guide plate (5) and flows toward the air inlet.

4. The range hood according to claim 3, characterized in that: The outer cover of the enlarged head (6) is provided with an outer shell (7), and an air flow pipeline is formed between the outer shell (7) and the enlarged head (6); The upper edge (17) of the housing (7) is spaced apart from the upper surface of the smoke guide plate (5) to form an airflow inlet; The lower edge (18) of the housing (7) is spaced apart from the lower surface of the smoke guide plate (5) to form an airflow outlet; The air flow inlet is one pipe opening of the air flow pipeline, and the air flow outlet is another pipe opening of the air flow pipeline.

5. The range hood according to claim 4, characterized in that: The housing (7) has a "C"-shaped cross section with its opening facing the jet generator; and / or Both left and right ends of the airflow pipeline are closed; and / or The airflow inlet and the airflow outlet are the only openings of the airflow pipeline that are connected to the external space; and / or A reinforcing rib (8) is provided in the air flow pipeline, and the reinforcing rib (8) divides the air flow pipeline into at least two parts; and / or The outer surface of the enlarged head (6) is in the shape of a water drop.

6. The range hood according to claim 3, characterized in that: The jet generator is configured to eject the airflow toward the upper surface of the smoke guide plate (5) at a downward pressure angle α, 10°≤α≤45°; and / or The smoke guide plate (5) extends in a horizontal direction; and / or The flow direction of the airflow flowing out of the airflow outlet (4) changes by 180 degrees after flowing through the outer surface of the enlarged head (6), and then flows toward the air inlet.

7. The range hood according to claim 3, characterized in that: The smoke guide plate (5) is configured to be capable of switching between a first position and a second position along its extension direction; When the smoke guide plate (5) is located at the first position, the smoke guide plate (5) is completely or partially embedded in the housing (1), and the smoke guide plate (5) completely or partially closes the air inlet; When the smoke guide plate (5) is located at the second position, the smoke guide plate (5) is completely or partially moved forward out of the casing (1) to form an eaves portion.

8. The range hood according to claim 7, characterized in that: It comprises a centrifugal fan (14) and a cyclonic filter device (9) which are arranged in sequence from top to bottom, and both are arranged in the casing (1); When the smoke guide plate (5) is located at the first position, the cyclone filter device (9) is located directly above the smoke guide plate (5); When the smoke guide plate (5) is located at the second position, the jet generator is configured to be suitable for delivering an induced airflow to the cyclonic filtering device (9).

9. The range hood according to claim 8, characterized in that: When the smoke guide plate (5) is located at the first position, the housing (1) and the smoke guide plate (5) are both in a rectangular parallelepiped shape as a whole; and / or The cyclone filter device (9) is arranged obliquely in the housing (1); a first exhaust port (10) is provided at one end of the cyclone duct that is tilted upward, and the first exhaust port (10) faces the front side wall (2) of the housing (1); and / or The cyclone filter device (9) comprises a plurality of cyclone ducts arranged side by side; and / or An air inlet is provided on the wall of the cyclone duct, and the air inlet is open toward the air inlet located below it; and / or The first exhaust port (10) is placed on the jet generator.

10. The range hood according to claim 2, characterized in that: The airflow outlet (4) is arranged directly below the airflow inlet (3); and / or The bottom edge of the housing (1) is the bottommost end of the range hood; and / or The air inlet is located at the bottom of the range hood; and / or The front side wall (2) of the housing (1) extends in a vertical direction; and / or It comprises a smoke guide plate (5), the bottom edge of the front side wall (2) of the housing (1) and the upper surface of the smoke guide plate (5) are spaced apart to form the airflow outlet (4); and / or The jet generator comprises a shell (11) and a cross-flow impeller (12) arranged in the shell (11); the shell (11) is attached to the inner surface of the front side wall (2) of the casing (1); and the cross-flow impeller (12) is isolated from the oil fume airflow in the airflow channel.

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