Range hood

Abstract

The present application relates to the technical field of kitchen appliances, and specifically provides an oil fume exhaust machine, which at least solves the problem of poor smoke gathering effect of the existing oil fume exhaust machine. The oil fume exhaust machine comprises a smoke collecting hood and a flap, the bottom of the smoke collecting hood is provided with an air inlet, and the flap is reversibly arranged on the smoke collecting hood to open and close the air inlet; the oil fume exhaust machine further comprises a driving mechanism, a connecting rod mechanism and a hinge mechanism, the proximal end of the flap is connected to the smoke collecting hood through the hinge mechanism and connected to the driving mechanism through the connecting rod mechanism, and the connecting rod mechanism and the hinge mechanism are arranged so that, when the flap is in an open state, the part of the flap connected to the hinge mechanism can be retracted into the smoke collecting hood. Through the retracting action of the flap when it is opened, a larger flap opening angle can be achieved, thereby enhancing the smoke suction effect of the oil fume exhaust machine, and the length of the flap extending outward can be effectively shortened, so as to avoid blocking the user's line of sight during cooking or causing the user to bump his head due to the excessive length, thereby effectively improving the user's experience and safety.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, specifically providing a range hood. Background Technology

[0002] With the development of modern kitchen design, built-in and slim kitchen appliances are becoming increasingly popular among consumers. For example, European-style flat-panel range hoods, due to their simple appearance, can be seamlessly integrated with kitchen cabinets.

[0003] However, traditional European-style flat-panel range hoods, in order to achieve a slim design, typically have a relatively small smoke collection chamber and smoke gathering area. When the range hood is working, the limited smoke gathering area means that some smoke cannot be effectively captured, leading to smoke escape and affecting the range hood's smoke extraction efficiency. Simply increasing the external dimensions to expand the smoke gathering area would defeat the original intention of its slim, built-in design. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned technical problems, that is, at least to solve the problem of poor smoke collection effect of existing range hoods.

[0005] In a first aspect, the present invention provides a range hood, the range hood comprising a smoke collection hood and a flap, wherein the bottom of the smoke collection hood has an air inlet, and the flap is rotatably disposed on the smoke collection hood to open and close the air inlet; the range hood further comprises a drive mechanism, a linkage mechanism and a hinge mechanism, wherein the proximal end of the flap is connected to the smoke collection hood via the hinge mechanism and to the drive mechanism via the linkage mechanism, the linkage mechanism and the hinge mechanism being configured such that when the flap is in the open state, the portion of the flap connected to the hinge mechanism can retract into the smoke collection hood.

[0006] In some feasible embodiments of the range hood described above, the hinge mechanism includes a first swing arm and a second swing arm. The first end of the first swing arm and the first end of the second swing arm are respectively hinged to the smoke collection hood, and the second end of the first swing arm and the second end of the second swing arm are respectively hinged to the flap. By employing a four-bar linkage structure composed of the first and second swing arms, the complex movement trajectory of the flap can be achieved, providing a structural basis for the subsequent retraction action.

[0007] In some feasible embodiments of the range hood described above, the first end of the first swing arm is hinged to the first hinge point of the smoke collection hood, the first end of the second swing arm is hinged to the second hinge point of the smoke collection hood, and the first hinge point and the second hinge point are spaced apart; the second end of the first swing arm is hinged to the third hinge point of the flap, and the second end of the second swing arm is hinged to the fourth hinge point of the flap, and the third hinge point and the fourth hinge point are spaced apart.

[0008] In some feasible embodiments of the range hood described above, the distance between the first hinge point and the second hinge point is greater than the distance between the third hinge point and the fourth hinge point. This unequal-distance four-bar linkage design allows the proximal end of the flap to generate a displacement component that translates into the smoke collection hood when the flap is flipped open, thereby achieving a retraction effect.

[0009] In some feasible embodiments of the range hood described above, the first swing arm is a curved swing arm.

[0010] In some feasible embodiments of the range hood described above, the smoke collection hood is provided with a first hinge seat, and the first hinge point and the second hinge point are both formed on the first hinge seat; and / or, the flap is provided with a second hinge seat, and the third hinge point and the fourth hinge point are both formed on the second hinge seat.

[0011] In some feasible embodiments of the range hood described above, the hinge mechanism consists of two sets, symmetrically arranged on both sides of the flap. Using two symmetrically arranged hinge mechanisms allows for more even force distribution and smoother movement of the flap during its flipping process, avoiding flap twisting or jamming problems that might occur due to unilateral drive or support.

[0012] In some feasible embodiments of the range hood described above, the linkage mechanism includes a first linkage and a second linkage. The drive mechanism is drivenly connected to the first end of the first linkage, the second end of the first linkage is hinged to the first end of the second linkage, and the second end of the second linkage is hinged to the flap. Through the transmission of the two-stage linkage, the power of the drive mechanism can be smoothly transmitted to the flap, achieving stable control of the flap's rotation.

[0013] In some feasible embodiments of the range hood described above, the second connecting rod is arc-shaped; and / or, the flap is provided with a third hinge seat, and the second end of the second connecting rod is hinged to the third hinge seat.

[0014] In some feasible embodiments of the range hood described above, the flap is made of glass; and / or, an oil cup is provided on the rear side of the bottom of the smoke collection hood; and / or, a decorative panel is provided on the front side of the smoke collection hood.

[0015] The beneficial effects of this invention are: (1) By setting a flip-up flap and introducing a linkage mechanism and hinge mechanism to limit the movement trajectory of the flap, the near end of the flap can retract into the inside of the smoke collection hood when it is opened under the action of the drive mechanism. This design allows the far end of the flap to unfold outward when it is opened, thereby forming a large smoke collection area when the range hood is working, thus improving the smoke extraction effect and smoke exhaust efficiency of the range hood; while in the closed state, the flap can smoothly close the air inlet, maintaining the slimness and beauty of the body, effectively taking into account the dual needs of slim design and efficient smoke collection.

[0016] (2) The retraction action when the flap is opened not only enables a larger flap opening angle, allowing the air inlet to be exposed more fully, thereby enhancing the smoke extraction effect and smoke exhaust efficiency of the range hood, but also effectively shortens the length of the flap extending outward, avoiding obstructing the user's view during cooking or causing the user to bump their head due to excessive extension, effectively improving the user experience and safety. Attached Figure Description

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which: Figure 1 A three-dimensional structural diagram of a range hood with the flap in the open state, provided in an embodiment of the present invention; Figure 2 This is a right view of a range hood with the flap in the open state, as provided in an embodiment of the present invention. Figure 3 This is a front view of a range hood with the flap in the open state, as provided in an embodiment of the present invention. Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 This is a schematic diagram showing the connection between the two hinge mechanisms and the flap of the range hood provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the drive mechanism, linkage mechanism, hinge structure, and connection of the flap of the range hood provided in an embodiment of the present invention when the flap is in the open state. Figure 7 A three-dimensional structural diagram of a range hood with the flap in the closed state, provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the drive mechanism, linkage mechanism, hinge structure, and connection of the flap of the range hood when the flap is in the closed state, as provided in an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Smoke hood; 11. Air inlet; 12. Oil cup; 13. Decorative panel; 14. First hinge seat; 141. Clearance opening; 15. Motor base; 2. Flip plate; 21. Second hinge seat; 22. Third hinge seat; 3. Drive mechanism; 4. Linkage mechanism; 41. First link; 42. Second link; 5. Hinge mechanism; 51. First swing arm; 52. Second swing arm. Detailed Implementation

[0019] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. Numerous specific details are set forth in the following detailed description to better illustrate the invention. Those skilled in the art should understand that the invention can be practiced without certain specific details.

[0020] In the description of this invention, terms such as "upper," "lower," "inner," "outer," "left," "right," "front," and "rear," which indicate direction or positional relationships, are based on actual application and are used merely for ease of description. They do not indicate or imply that the device to be protected must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, ordinal numbers such as "first" and "second" are used only for convenience and are not intended to indicate or imply relative importance.

[0021] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] In addition to the aforementioned problem of poor smoke collection in existing range hoods, the inventors have also discovered that existing flap-type range hoods typically hinge one end of the flap to the front edge of the smoke collection hood or the edge of the air inlet, and drive the flap to rotate around this hinge point via a drive mechanism to open and close. However, due to limitations in the hinge position and the movement space of the linkage mechanism, the maximum opening angle of such flaps is often relatively small, making it difficult to fully expose the air inlet and affecting the smoke extraction effect. If the drive arm is extended or the fulcrum is changed to increase the opening angle, the second end of the flap will extend significantly forward, protruding considerably from the front of the smoke collection hood, easily forming a large area of ​​obstruction in front of the user's line of sight and interfering with cooking operations.

[0023] To resolve the above issues, please refer to Figures 1 to 8 This invention provides a range hood, which includes a smoke collection hood 1 and a flap 2. The bottom of the smoke collection hood 1 has an air inlet 11, and the flap 2 is rotatably mounted on the smoke collection hood 1 to open and close the air inlet 11. Wherein, as... Figure 1 and Figure 2 As shown, when the flap 2 is open, it exposes the air inlet 11 and helps guide the oil fumes towards the range hood, thus forming a large smoke-collecting area when the range hood is working, improving the smoke extraction effect and exhaust efficiency of the range hood; Figure 7 As shown, when the flap 2 is closed, it can cover the air inlet 11, maintaining the flat and beautiful appearance of the range hood.

[0024] Based on the foregoing, such as Figures 1 to 4 As shown, the range hood in this embodiment also includes a drive mechanism 3, a linkage mechanism 4, and a hinge mechanism 5. The proximal end of the flap 2 is connected to the smoke collection hood 1 via the hinge mechanism 5 and to the drive mechanism 3 via the linkage mechanism 4. The linkage mechanism 4 and the hinge mechanism 5 are configured such that when the flap 2 is in the open state, the portion of the flap 2 connected to the hinge mechanism 5 can retract into the smoke collection hood 1. The proximal end of the flap 2 is the end of the flap 2 closest to the user in the closed state, and the distal end of the flap 2 is the end of the flap 2 furthest from the user in the closed state.

[0025] This invention, through the kinematic coordination design of the linkage mechanism 4 and the hinge mechanism 5, enables the portion of the flap 2 connected to the hinge mechanism 5 (i.e., the proximal end of the flap 2) to retract inward into the smoke hood 1 when the drive mechanism 3 drives the flap 2 to open. This retraction movement breaks the limitations of the traditional fixed pivot, allowing the flap 2 to achieve a larger opening angle without significantly increasing the forward protrusion distance, thereby fully exposing the air inlet 11 and effectively improving smoke extraction efficiency. Simultaneously, because the flap 2 retracts inward when opened, it avoids the formation of a large protrusion at its distal end on the outside of the unit after opening, thus solving the problem that the traditional flap 2 structure might obstruct the user's view. This provides a wider field of vision, especially during cooking operations, and effectively improves the user experience.

[0026] Furthermore, in a preferred embodiment, to achieve the aforementioned retraction movement, the hinge mechanism 5 is specifically a four-bar linkage 4. For example... Figure 5 , Figure 6 and Figure 8As shown, the hinge mechanism 5 includes a first swing arm 51 and a second swing arm 52. The first end of the first swing arm 51 and the first end of the second swing arm 52 are respectively hinged to the smoke hood 1, and the second end of the first swing arm 51 and the second end of the second swing arm 52 are respectively hinged to the flip plate 2. In this way, the connecting part of the smoke hood 1, the first swing arm 51, the connecting part of the flip plate 2, and the second swing arm 52 together constitute a four-bar linkage 4. The connecting part on the smoke hood 1 is a fixed frame, the connecting part on the flip plate 2 is a driven member, and the first swing arm 51 and the second swing arm 52 are connecting rods. When the flip plate 2 moves, the four-bar linkage 4 can guide the flip plate 2 to produce a preset planar composite motion, rather than a simple fixed-axis rotation. It is this composite motion that allows the flip plate 2 to move inward and upward at the same time as it flips outward, thereby achieving a retraction effect.

[0027] Based on the above embodiments, the hinge points of the four-bar linkage 4 are further defined. The first end of the first swing arm 51 is hinged to the first hinge point of the smoke hood 1, and the first end of the second swing arm 52 is hinged to the second hinge point of the smoke hood 1, with the first and second hinge points spaced apart. The second end of the first swing arm 51 is hinged to the third hinge point of the flap 2, and the second end of the second swing arm 52 is hinged to the fourth hinge point of the flap 2, with the third and fourth hinge points spaced apart. These four hinge points together define the kinematic characteristics of the four-bar linkage 4, and by defining the positional relationship of the four hinge points, the proximal end of the flap 2 can retract into the smoke hood 1.

[0028] Specifically, the distance between the first and second hinge points is greater than the distance between the third and fourth hinge points. This dimensional relationship means that the four-bar linkage 4 is a non-parallel quadrilateral mechanism. Kinematically, a non-parallel four-bar linkage can convert the rotation of the input rod into a complex planar motion (including both rotation and translation) of the output rod. Based on this principle, when the flap 2 is driven to open, the connecting part of the flap 2 (as a driven member and shorter in length) will generate an inward contraction translational component relative to the connecting part of the smoke hood 1 (as a fixed frame and longer in length). This translational component is superimposed on the flipping motion of the flap 2 itself, macroscopically manifested as the proximal end of the flap 2 retracting into the smoke hood 1, thereby causing the flap 2 to open to a specific angle (e.g., Figure 2 As shown, when the maximum opening angle α of the flap 2 is an obtuse angle (for example, when the maximum opening angle α is 125°), its retraction reaches its maximum, thereby achieving a larger smoke collection range while effectively reducing obstruction of the user's line of sight.

[0029] Furthermore, the first swing arm 51 is a curved swing arm. By designing the first swing arm 51 into a predetermined curved shape, it is possible to make its arm body avoid potential interference points without changing the relative positions of its two hinge points, thereby ensuring a smooth and unobstructed opening and closing process. Moreover, compared with a straight swing arm, the curved shape of the first swing arm 51 can effectively avoid other components inside the smoke hood 1 during movement, providing greater flexibility and design freedom for the internal structural layout.

[0030] In a preferred embodiment, the smoke hood 1 is provided with a first hinge seat 14, on which both the first and second hinge points are formed. The flap 2 is provided with a second hinge seat 21, on which both the third and fourth hinge points are formed. By integrating two hinge points that were originally scattered on the large sheet metal parts of the smoke hood 1 or flap 2 into a single independent hinge seat, not only can the dimensional accuracy and consistency of the hinge point spacing be effectively improved, but the positional relationship of multiple hinge points can also be precisely integrated into a single part, effectively simplifying the final assembly process and assembly line process, thereby improving production efficiency and product consistency.

[0031] Furthermore, such as Figure 6 and Figure 8 As shown, the first hinge seat 14 is provided with a clearance opening 141. During the opening and closing of the flap 2, the clearance opening 141 can provide the necessary clearance space for the flap 2, avoiding mechanical interference between the flap 2 and the hinge seat or other internal components when the flap 2 is flipped, thereby ensuring that the flap 2 moves smoothly and without jamming, and thus improving the motion reliability and service life of the entire motion mechanism.

[0032] In a preferred embodiment, such as Figure 5 As shown, there are two sets of hinge mechanisms 5, which are symmetrically arranged on both sides of the flap 2. When the drive mechanism 3 drives the flap 2 to move, the two sets of hinge mechanisms 5 move synchronously, jointly supporting and guiding the flap 2. This effectively prevents the flap 2 from twisting, shaking, or jamming due to uneven force at a single point during movement, ensuring the smoothness, stability, and reliability of the entire opening and closing process, and improving the stability and durability of the entire motion mechanism.

[0033] In a preferred embodiment, the specific structure of the linkage mechanism 4 that transmits power has also been optimized. For example... Figure 5 , Figure 6 and Figure 8As shown, the linkage mechanism 4 includes a first link 41 and a second link 42. The drive mechanism 3 is drivenly connected to the first end of the first link 41, the second end of the first link 41 is hinged to the first end of the second link 42, and the second end of the second link 42 is hinged to the flap 2. This two-stage linkage design allows for more flexible arrangement of the drive mechanism 3's position. By adjusting the lengths of the two links and the hinge points, the required transmission ratio and motion conversion can be achieved, thus efficiently converting the simple rotational motion of the drive mechanism 3 into a force that drives the flap 2 to perform compound motion.

[0034] In this embodiment, the drive mechanism 3 is a stepper motor, servo motor, or other type of motor, and is fixedly installed inside the smoke collection hood 1, such as... Figure 4 and Figure 5 As shown, the smoke collection hood 1 has a motor base 15 inside, and the drive mechanism 3 is fixedly installed on the motor base 15.

[0035] Furthermore, in order to achieve interference-free motion within a limited internal space, such as Figure 4 As shown, the second link 42 is arc-shaped. By designing the second link 42 as arc-shaped, its curved profile can bypass other fixed components inside the smoke collection chamber or smoke hood 1 during the swinging process, avoiding motion interference and ensuring smooth power transmission.

[0036] like Figure 5 As shown, the flap 2 is provided with a third hinge seat 22, and the second end of the second connecting rod 42 is hinged to the third hinge seat 22. The third hinge seat 22, as a key connection node between the flap 2 and the second connecting rod 42, effectively improves the connection strength and structural reliability. Furthermore, it acts as a hinge point for transmitting power, bearing the complex loads applied by the linkage mechanism 4 during the driving process and effectively dispersing stress, thereby ensuring connection stability and durability during long-term use. In addition, the design of the third hinge seat 22 also helps to improve the fatigue resistance of the flap 2 under frequent opening and closing actions, reducing loosening or wear that may occur due to long-term stress, further enhancing the service life and operational reliability of the entire machine.

[0037] In this embodiment, the flap 2 is made of glass. The glass flap 2, when closed, presents a unified mirror-like visual effect, making the range hood more refined and simple, enhancing its appearance and the overall aesthetics of the kitchen. Simultaneously, the dense, non-porous surface of the glass flap 2 makes it difficult for grease to adhere; daily cleaning only requires a gentle wipe with a damp cloth to remove grease, eliminating the need for strong corrosive cleaners. It is also less prone to scratches and remains shiny and new even after long-term use, reducing cleaning difficulty and frequency.

[0038] In this embodiment, an oil cup 12 is provided on the rear side of the bottom of the fume hood 1. The oil cup 12 can effectively collect the waste oil that flows down the inner wall of the fume hood 1 after the oil fumes are separated, preventing grease from dripping onto the stove or cooking utensils and keeping the kitchen clean and hygienic. At the same time, the oil cup 12 is located on the rear side, so it does not affect the front view or operating space, and the grease naturally collects in the oil cup 12 by gravity, making it easy to disassemble and clean, reducing the frequency of user maintenance and improving ease of use.

[0039] In this embodiment, a decorative panel 13 is provided on the front side of the smoke hood 1. The decorative panel 13 can be provided with a colored surface decorative layer. The decorative panel 13 can effectively cover the hinge seats, linkage mechanism 4, screws, and other components at the front of the range hood, giving the front of the range hood a bright and beautiful visual effect and enhancing the product's texture. In addition, the surface of the decorative panel 13 is smooth and easy to clean, and it can also play a role in preventing dust and oil stains from adhering, facilitating daily cleaning, and coordinating with the style of the kitchen cabinets, enhancing the overall integrity of the slim and embedded design.

[0040] The working process of this invention: In the initial closed state (e.g.) Figure 7 and Figure 8 As shown, the flap 2 is horizontally closed at the bottom of the smoke hood 1, completely covering the air inlet 11. When the user issues an opening command through the control panel, the drive mechanism 3 (such as a starter motor) is activated, which is converted into a pulling force on the third hinge seat 22 on the flap 2 through the linkage structure (i.e., the first link 41 and the second link 42). Under the action of this pulling force, the flap 2 begins to move, and its movement trajectory is effectively limited by the hinge mechanisms 5 on both sides. Since the hinge mechanism 5 is a non-parallel four-bar structure, the flap 2 will not rotate around a fixed axis. Instead, as the far end of the flap 2 flips downward, the first swing arm 51 and the second swing arm 52 swing simultaneously, forcing the second hinge seat 21 (i.e., the near end of the flap 2) to move along a predetermined inward and upward curved trajectory, thus realizing the retraction movement.

[0041] This process continues until the flap 2 reaches the preset maximum opening angle (e.g., Figure 1 , Figure 2 and Figure 4 (As shown). At this time, the drive mechanism 3 stops working, the flap 2 remains stably in the open position, the entire air inlet 11 is fully exposed, and the flap 2 itself forms an effective airflow guiding and smoke collection surface. Due to the retraction effect, the leading edge of the flap 2 (i.e., the far end of the flap 2 in the closed state) is significantly recessed compared to the traditional structure, providing the user with a wide operating space and field of vision.

[0042] When closing is required, the drive mechanism 3 rotates in the reverse direction, pushing the flap 2 through the linkage mechanism 4. The hinge mechanisms 5 on both sides guide the flap 2 back along the original path, ultimately restoring it accurately to the horizontal closed position (e.g., Figure 7As shown in the image, the entire process was smooth, quiet, and without any impact.

[0043] This invention, by setting a flip-up flap 2 and introducing a linkage mechanism 4 and a hinge mechanism 5 to limit the movement trajectory of the flap 2, allows the proximal end of the flap 2 to retract into the interior of the smoke collection hood 1 when it is opened under the action of the drive mechanism 3. This design allows the distal end of the flap 2 to extend outward when it is open, thus forming a large smoke collection area when the range hood is working, thereby improving the smoke extraction effect and smoke exhaust efficiency of the range hood; when closed, the flap 2 can smoothly close the air inlet 11, maintaining the slimness and aesthetics of the body, effectively balancing the dual requirements of a slim design and efficient smoke collection. In particular, the retraction action of the flap 2 when it is opened not only allows for a larger opening angle of the flap 2, making the air inlet 11 more fully exposed, thereby enhancing the smoke extraction effect and smoke exhaust efficiency of the range hood, but also effectively shortens the outward extension length of the flap 2, preventing it from obstructing the user's view during cooking or causing the user to bump their head due to excessive extension, effectively improving the user experience and safety.

[0044] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A range hood, characterized in that, The range hood includes a smoke collection hood (1) and a flap (2). The bottom of the smoke collection hood (1) is provided with an air inlet (11). The flap (2) is rotatably disposed on the smoke collection hood (1) to open and close the air inlet (11). The range hood also includes a drive mechanism (3), a linkage mechanism (4) and a hinge mechanism (5). The proximal end of the flap (2) is connected to the smoke hood (1) through the hinge mechanism (5) and to the drive mechanism (3) through the linkage mechanism (4). The linkage mechanism (4) and the hinge mechanism (5) are configured such that when the flap (2) is in the open state, the part of the flap (2) connected to the hinge mechanism (5) can retract into the smoke hood (1).

2. The range hood according to claim 1, characterized in that, The hinge mechanism (5) includes a first swing arm (51) and a second swing arm (52). The first end of the first swing arm (51) and the first end of the second swing arm (52) are respectively hinged to the smoke hood (1), and the second end of the first swing arm (51) and the second end of the second swing arm (52) are respectively hinged to the flap (2).

3. The range hood according to claim 2, characterized in that, The first end of the first swing arm (51) is hinged to the first hinge point of the smoke hood (1), and the first end of the second swing arm (52) is hinged to the second hinge point of the smoke hood (1). The first hinge point and the second hinge point are spaced apart. The second end of the first swing arm (51) is hinged to the third hinge point of the flip plate (2), and the second end of the second swing arm (52) is hinged to the fourth hinge point of the flip plate (2). The third hinge point and the fourth hinge point are spaced apart.

4. The range hood according to claim 3, characterized in that, The distance between the first hinge point and the second hinge point is greater than the distance between the third hinge point and the fourth hinge point.

5. The range hood according to claim 4, characterized in that, The first swing arm (51) is a curved swing arm.

6. The range hood according to claim 4, characterized in that, The smoke hood (1) is provided with a first hinge seat (14), and both the first hinge point and the second hinge point are formed on the first hinge seat (14); and / or The flap (2) is provided with a second hinge seat (21), and the third hinge point and the fourth hinge point are both formed on the second hinge seat (21).

7. The range hood according to claim 4, characterized in that, The hinge mechanism (5) consists of two sets, which are symmetrically arranged on the flap (2) near its two sides.

8. The range hood according to any one of claims 1 to 7, characterized in that, The linkage mechanism (4) includes a first link (41) and a second link (42). The driving mechanism (3) is driven to the first end of the first link (41). The second end of the first link (41) is hinged to the first end of the second link (42). The second end of the second link (42) is hinged to the flap (2).

9. The range hood according to claim 8, characterized in that, The second link (42) is arc-shaped; and / or The flap (2) is provided with a third hinge seat (22), and the second end of the second connecting rod (42) is hinged to the third hinge seat (22).

10. The range hood according to claim 1, characterized in that, The flap (2) is made of glass; and / or An oil cup (12) is provided on the rear side of the bottom of the smoke hood (1); and / or The front side of the smoke hood (1) is provided with a decorative panel (13).

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