Range hood

Abstract

The utility model relates to the technical field of kitchen appliances, and discloses a range hood. The range hood comprises a smoke collecting cavity assembly, a smoke outlet and a smoke outlet, wherein a smoke inlet is formed in the smoke collecting cavity assembly; the turning plate mechanism is used for closing or opening the smoke inlet and comprises an upper turning plate assembly and a lower turning plate assembly, the upper turning plate assembly is connected with the smoke collecting cavity assembly, and the lower turning plate assembly is connected to the lower end of the upper turning plate assembly through a linkage assembly; the smoke inlet plate assembly is supported at the smoke inlet; the turning plate mechanism has an opening state I and an opening state II, and when the turning plate mechanism is in the opening state I, the diameter of any inscribed circle of a hollow area jointly defined by the smoke inlet plate assembly, the linkage assembly and the lower turning plate assembly is smaller than a preset safety value; or in the second opening state, the diameter of any inscribed circle of the hollowed-out area defined by the linkage assembly and the lower turning plate assembly is smaller than the preset safety value. According to the range hood, the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a range hood. Background Art

[0002] Range hoods are widely used electrical appliances in kitchens to exhaust fumes generated during cooking. Range hoods usually include a smoke collecting chamber assembly and a flap assembly. A smoke inlet is formed on the smoke collecting chamber assembly. When the range hood is not working, the flap assembly is in a closed state to block the smoke inlet; when the range hood is working, the flap assembly is in an open state to flip outward and open the smoke inlet, and the flap assembly can collect smoke.

[0003] As people's living standards and quality requirements improve, there are more and more electrical appliances with various functions in the kitchen. However, due to the limited space in the kitchen, the size of kitchen appliances has gradually tended to be miniaturized and integrated. The same is true for the range hood, one of the important kitchen appliances. However, while reducing the size and size, some important performances may be affected or reduced. For example, the negative pressure area is placed at the rear, the smoke inlet is far from the smoke generating area, the smoke collection area is small, and the internal space of the smoke collecting chamber is insufficient, which will cause the problem of poor smoking effect. Therefore, in order to improve the smoke collection effect, some existing range hoods will adopt a multi-baffle linkage method to solve some of the problems. The flap assembly includes an upper flap and a lower flap. The upper flap can be flipped outward at a certain angle relative to the frame, and the lower flap can be further flipped outward relative to the upper flap, thereby expanding the smoke collection area and ensuring a better smoke collection effect.

[0004] During the opening and closing movement of the flap mechanism, the flap connection structure, such as the gap between the connecting rods in the linkage assembly, changes continuously when the range hood is in different working states. There is a risk of squeezing or cutting fingers, which does not comply with the 3C safety requirements for kitchen appliances and poses a safety risk in use.

[0005] Therefore, there is an urgent need for a range hood to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of the utility model is to provide a range hood which can improve the safety of use.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] A range hood, comprising:

[0009] A smoke collecting chamber assembly, on which a smoke inlet is provided;

[0010] A flap mechanism, used to close or open the smoke inlet, the flap mechanism comprising an upper flap assembly and a lower flap assembly, the upper flap assembly is connected to the smoke collecting chamber assembly, and the lower flap assembly is connected to the lower end of the upper flap assembly through a linkage assembly; and,

[0011] A smoke inlet plate assembly, the smoke inlet plate assembly being supported at the smoke inlet port;

[0012] The flap mechanism has an open state one and an open state two. In the open state one, the diameter of any inscribed circle of the hollow area jointly enclosed by the smoke inlet plate assembly, the linkage assembly and the lower flap assembly is smaller than a preset safety value; or in the open state two, the diameter of any inscribed circle of the hollow area jointly enclosed by the linkage assembly and the lower flap assembly is smaller than the preset safety value.

[0013] As a preferred technical solution, the smoke inlet plate assembly includes:

[0014] A smoke inlet plate and a lower shield, the smoke inlet plate is connected to the lower shield, one end of the lower shield is pivotally connected to the smoke collecting chamber assembly, and the other end is transmission-connected to the upper flap assembly, so that the smoke inlet plate abuts against the inner surface of the upper flap assembly when the smoke inlet port is closed, and is supported at the smoke inlet port when the smoke inlet port is opened; in the open state one, the lower shield, the linkage assembly and the lower flap assembly together surround the hollow area.

[0015] As a preferred technical solution, the linkage assembly includes a first link, a second link, a third link and a fourth link, one end of the first link is pivotally connected to the upper flap assembly, two ends of the second link are respectively pivotally connected to the other end of the first link and the lower flap assembly, one end of the third link is pivotally connected to the lower flap assembly, two ends of the fourth link are respectively pivotally connected to the other end of the third link and the upper flap assembly, and the second link and the fourth link are cross-arranged and pivotally connected;

[0016] In the first opening state, the lower shield, the second connecting rod, the third connecting rod and the lower flap assembly together form the hollow area;

[0017] In the second opening state, the second connecting rod, the fourth connecting rod, the third connecting rod and the lower flap assembly together form the hollow area.

[0018] As a preferred technical solution, the linkage component also includes:

[0019] a first bracket, wherein the first bracket is connected to the upper flap assembly, and the first connecting rod and the fourth connecting rod are respectively pivotally connected to the first bracket;

[0020] a second bracket, the second bracket being connected to the lower flap assembly, the second connecting rod and the third connecting rod being pivotally connected to the second bracket respectively;

[0021] In the first opening state, the lower shield, the second connecting rod, the third connecting rod and the second bracket together form the hollow area; in the second opening state, the second connecting rod, the fourth connecting rod, the third connecting rod and the second bracket together form the hollow area.

[0022] As a preferred technical solution, the third connecting rod is a polygonal structure to divide the hollow area into a plurality of sub-areas, and the diameter of the inscribed circle of any sub-area is smaller than the preset safety value.

[0023] As a preferred technical solution, the cross-sectional shape of the third connecting rod is a triangle, the two ends of a straight side of the third connecting rod are pivotally connected to the second bracket and the fourth connecting rod respectively, and the corner opposite to the straight side is located in the hollow area.

[0024] As a preferred technical solution, the first connecting rod and the second connecting rod, the second connecting rod and the fourth connecting rod, and the third connecting rod and the fourth connecting rod are all connected through a rotary rivet shaft; the first connecting rod and the fourth connecting rod are respectively connected to the first bracket through a rotary rivet shaft, and the second connecting rod and the third connecting rod are respectively connected to the second bracket through a rotary rivet shaft.

[0025] As a preferred technical solution, the second bracket is fixed to the front side of the lower flap assembly by fasteners.

[0026] As a preferred technical solution, the lower shield includes:

[0027] A transmission plate, one end of which is pivotally connected to the smoke collecting chamber assembly, and the other end of which is pivotally connected to the upper flap assembly; and

[0028] A shield body is fixedly connected to the transmission plate, the smoke inlet plate is fixedly connected to the shield body, the shield body and the transmission plate are surrounded to form a receiving cavity, and at least part of the linkage assembly is arranged in the receiving cavity;

[0029] In the first opening state, the shield body, the second connecting rod, the third connecting rod and the second bracket together form the hollow area.

[0030] As a preferred technical solution, the shield body includes a front panel and two side panels arranged on the left and right sides of the front panel, the front panel and the two side panels are arranged to form a C-shaped structure, the transmission plate blocks the opening of the C-shaped structure, the front panel is coplanar with the smoke inlet plate, and in the open state one, the side panels, the second connecting rod, the third connecting rod and the second bracket together form the hollow area.

[0031] As a preferred technical solution, a first avoidance opening is provided on the front panel for part of the linkage components to pass through, and the maximum width of the first avoidance opening is smaller than the preset safety value.

[0032] As a preferred technical solution, the preset safety value is 12 mm.

[0033] The beneficial effects of the utility model are:

[0034] The range hood of the utility model has a flap mechanism with an opening state 1 and an opening state 2. In the opening state 1, the diameter of any inscribed circle of the hollow area surrounded by the smoke inlet plate assembly, the linkage assembly and the lower flap assembly is smaller than a preset safety value; or in the opening state 2, the diameter of any inscribed circle of the hollow area surrounded by the linkage assembly and the lower flap assembly is smaller than a preset safety value. The range hood reduces the safety risk of users when using it through the above structure and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural schematic diagram of the range hood provided by the first embodiment of the utility model in a closed state;

[0036] Figure 2 It is a schematic cross-sectional structure diagram of the range hood provided by the first embodiment of the utility model in a closed state;

[0037] Figure 3 The cross-sectional structure of the range hood provided by the first embodiment of the utility model is in the open state. Figure 1 ;

[0038] Figure 4 The cross-sectional structure of the range hood provided by the first embodiment of the utility model is in the open state. Figure 1 ;

[0039] Figure 5 It is a structural schematic diagram of a transmission assembly, a linkage assembly, an opening and closing sequence adjustment assembly and a driving assembly provided in the first embodiment of the utility model;

[0040] Figure 6 yes Figure 5 A partial enlarged view of the L in the middle;

[0041] Figure 7 yes Figure 5 A partial enlarged view of the M in the middle;

[0042] Figure 8 It is a structural schematic diagram of a transmission assembly, a partial linkage assembly and an opening and closing sequence adjustment assembly provided in the first embodiment of the utility model;

[0043] Fig. 9 It is a structural schematic diagram of the transmission assembly, linkage assembly, opening and closing sequence adjustment assembly and driving assembly provided in the first embodiment of the utility model when the range hood is in a closed state;

[0044] Fig.10 It is a structural schematic diagram of the transmission assembly, linkage assembly, opening and closing sequence adjustment assembly and driving assembly provided in the first embodiment of the utility model when the range hood is in the open state;

[0045] Fig.11 It is a structural schematic diagram of the transmission assembly, linkage assembly, opening and closing sequence adjustment assembly and driving assembly provided in the first embodiment of the utility model when the range hood is in the second open state;

[0046] Fig.12 yes Fig.11 A local enlarged view of the N position in the middle;

[0047] Fig.13 This is a structural schematic diagram of the range hood provided by the first embodiment of the utility model in the second open state;

[0048] Fig.14 The cross-sectional structure of the range hood provided by the first embodiment of the utility model is in the open state. Figure 2 ;

[0049] Fig.15 yes Fig.14 A partial enlarged view of the O in the middle;

[0050] Fig.16 The cross-sectional structure of the range hood provided by the first embodiment of the utility model is in the open state. Figure 2 ;

[0051] Fig.17 yes Fig.16 A partial enlarged view of the P in the middle;

[0052] Fig.18 yes Fig.13 A partial enlarged view of the K in the middle;

[0053] Fig.19 It is a schematic cross-sectional structure diagram of a partial structure of a range hood provided in the first embodiment of the utility model;

[0054] Fig. 20 This is a schematic diagram of the structure of the transmission assembly, linkage assembly, opening and closing sequence adjustment assembly and drive assembly provided in the second embodiment of the utility model when the range hood is in a closed state;

[0055] Fig.21 It is a structural schematic diagram of the transmission assembly, linkage assembly, opening and closing sequence adjustment assembly and driving assembly provided in the second embodiment of the utility model when the range hood is in the third opening state;

[0056] Fig. 22 It is a structural schematic diagram of the transmission assembly, linkage assembly, opening and closing sequence adjustment assembly and drive assembly provided in the second embodiment of the utility model when the range hood is in the second open state.

[0057] In the figure:

[0058] 1. Smoke collecting chamber assembly;

[0059] 2. flap mechanism; 21. upper flap assembly; 211. upper flap body; 212. upper decorative plate; 22. lower flap assembly; 221. lower flap body; 222. lower decorative plate; 23. smoke inlet plate assembly; 231. air inlet plate; 232. lower shield; 2321. transmission plate; 2322. shield body; 23221. front panel; 23222. side panel; 23223. first avoidance;

[0060] 3. Drive components;

[0061] 4. Transmission assembly; 41. First support seat; 42. Second support seat; 43. First transmission rod; 44. Second transmission rod; 45. Third transmission rod; 46. Fourth transmission rod; 461. Third limiting plane;

[0062] 5. linkage assembly; 51. first bracket; 52. second bracket; 53. first connecting rod; 531. first limiting plane; 532. second limiting plane; 54. second connecting rod; 55. third connecting rod; 56. fourth connecting rod;

[0063] 6. Opening and closing sequence adjustment component; 61. Connecting component; 611. Connecting rod; 612. Riveting shaft; 62. First elastic member; 63. Slide rail; 64. Sliding block; 65. Second elastic member; 66. First guide member; 67. Second guide member; 68. Nut;

[0064] 7. Screws. DETAILED DESCRIPTION

[0065] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific implementation methods disclosed below.

[0066] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0070] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0071] Embodiment 1

[0072] This embodiment provides a range hood, such as Figure 1 As shown, the range hood includes a smoke collecting chamber assembly 1, a flap mechanism 2 and a fan, wherein the smoke collecting chamber assembly 1 is enclosed to form a accommodating space, the fan is arranged in the accommodating space, the accommodating space has a smoke inlet, and the flap mechanism 2 is movably connected to the smoke collecting chamber assembly 1 and can close or open the smoke inlet. When the range hood is working, the flap mechanism 2 moves relative to the smoke collecting chamber assembly 1 and opens the smoke inlet, and then the fan works to form a negative pressure at the smoke inlet, thereby sucking the oil smoke outside the range hood into the smoke inlet and discharging it through the flue to the channel outside the range hood or outdoors. Optionally, the smoke collecting chamber assembly 1 can be spliced ​​by multiple pieces of sheet metal. In this embodiment, the smoke inlet formed by the smoke collecting chamber assembly 1 faces forward (in this embodiment, the descriptions of the front, back, left, right, up, and down directions are all relative to the user when the range hood is in use), as shown in FIG. Figure 1 As shown, when the range hood is in a closed state, that is, when the flap mechanism 2 is in a closed state, the flap mechanism 2 is in a vertical plane.

[0073] like Figures 1 to 4As shown, the flap mechanism 2 includes an upper flap assembly 21 and a lower flap assembly 22, wherein the upper end of the upper flap assembly 21 is connected to the smoke collecting chamber assembly 1 via a transmission assembly 4, and the upper end of the lower flap assembly 22 is transmission-connected to the lower end of the upper flap assembly 21 via a linkage assembly 5. The upper flap assembly 21 can flip outward relative to the smoke collecting chamber assembly 1, and the lower flap assembly 22 does not flip relative to the upper flap assembly 21, that is, the lower flap assembly 22 and the upper flap assembly 21 are coplanar. At this time, the smoke inlet is opened, and the flap mechanism 2 is in the open state one, that is, the range hood is in the open state one. For details, please refer to Figure 3 Optionally, the lower flap assembly 22 can be further turned outward relative to the upper flap assembly 21, so that the smoke inlet opening is as large as possible. At this time, the flap mechanism 2 is in the second open state, that is, the range hood is in the second open state. For details, see Figure 4 In the second open state, the negative pressure area formed outside the smoke inlet is the largest, and the oil fume extraction effect is the best. The second open state can correspond to the strong gear of the range hood, so the second open state is suitable for users to use in cooking activities with large oil fumes; in the first open state, the negative pressure area formed outside the smoke inlet is small, and the oil fume extraction effect is slightly worse. The first open state can correspond to the middle gear of the range hood, so the first open state is suitable for users to use in cooking activities with small oil fumes.

[0074] By setting the upper flap assembly 21 and the lower flap assembly 22 to flip twice, the dimension of the entire flap mechanism 2 extending to the front of the frame will not be too large, so as to avoid the flap mechanism 2 interfering with the user's actions. The lower flap assembly 22 can also play the role of collecting smoke and prevent the smoke from escaping upward. In addition, the upper flap assembly 21 flips inward relative to the smoke collecting chamber assembly 1, and the lower flap assembly 22 flips inward relative to the upper flap assembly 21, so that the entire flap mechanism 2 is restored to the position of closing the smoke inlet. It should be noted that in this embodiment, "flipping outward" is relative to the internal accommodating space of the smoke collecting chamber assembly 1.

[0075] like Figures 2 to 4 As shown, the upper flap assembly 21 includes an upper flap body 211 and an upper decorative plate 212, the transmission assembly 4 and the linkage assembly 5 are both connected to the upper flap body 211, and the upper decorative plate 212 covers the outer surface of the upper flap body 211. The upper flap body 211 can be made of sheet metal with good strength, so as to ensure the overall structural strength of the upper flap assembly 21 and provide reliable support for the linkage assembly 5 and the transmission assembly 4. Glass can be used for the upper decorative plate 212, which is not only beautiful but also easy to clean. Optionally, the upper flap body 211 and the upper decorative plate 212 can be fixed by bonding.

[0076] Similarly, the lower flap assembly 22 includes a lower flap body 221 and a lower decorative plate 222, the linkage assembly 5 is connected to the lower flap body 221, and the lower decorative plate 222 covers the outer surface of the lower flap body 221. The lower flap body 221 can be made of sheet metal with good strength, so as to ensure the overall structural strength of the lower flap assembly 22 and provide reliable support for the linkage assembly 5. The lower decorative plate 222 can be made of glass, which is not only beautiful but also easy to clean. Optionally, the lower flap body 221 and the lower decorative plate 222 can be fixed by bonding.

[0077] In order to prevent the upper flap assembly 21 from interfering with the smoke collecting chamber assembly 1 during the process of flipping outward relative to the frame, in the present embodiment, the transmission assembly 4 is connected between the inside of the smoke collecting chamber assembly 1 and the inner surface of the upper flap assembly 21, and the transmission assembly 4 can make the upper flap assembly 21 perform a compound movement of rotation and translation relative to the smoke collecting chamber assembly 1. Specifically, during the movement of the upper flap assembly 21, the rotational movement causes the upper flap assembly 21 to produce a certain angle relative to the smoke collecting chamber assembly 1, thereby opening the smoke inlet, and the translational movement causes the upper flap assembly 21 to evade in a direction away from the smoke collecting chamber assembly 1 (i.e., the front), thereby preventing the upper end of the upper flap assembly 21 from interfering with the smoke collecting chamber assembly 1. In the present embodiment, the transmission assembly 4 is connected to the upper surface of the inner side of the smoke collecting chamber assembly 1.

[0078] like Figure 5 and Figure 6 As shown, the transmission assembly 4 includes a first transmission rod 43, a second transmission rod 44, a third transmission rod 45 and a fourth transmission rod 46, one end of the first transmission rod 43 is pivoted to the inner surface of the smoke collecting chamber assembly 1, two ends of the second transmission rod 44 are pivoted to the other end of the first transmission rod 43 and the inner surface of the upper flap assembly 21, one end of the third transmission rod 45 is pivoted to the inner surface of the upper flap assembly 21, two ends of the fourth transmission rod 46 are pivoted to the other end of the third transmission rod 45 and the inner surface of the smoke collecting chamber assembly 1, and the fourth transmission rod 46 and the second transmission rod 44 are cross-arranged and pivoted.

[0079] Preferably, the transmission assembly 4 further includes a first support seat 41 and a second support seat 42, wherein the first support seat 41 is connected to the upper surface of the inner side of the smoke collecting chamber assembly 1. The first transmission rod 43 and the fourth transmission rod 46 are both pivotally connected to the first support seat 41, and form a pivot point a and a pivot point c respectively, that is, the first transmission rod 43 and the fourth transmission rod 46 are indirectly pivotally connected to the smoke collecting chamber assembly 1 through the first support seat 41. The second support seat 42 is connected to the upper end of the inner surface of the flap mechanism 2, and the second transmission rod 44 and the third transmission rod 45 are both pivotally connected to the second support seat 42, and form a pivot point e and a pivot point g respectively, that is, the second transmission rod 44 and the third transmission rod 45 are indirectly pivotally connected to the upper flap assembly 21 through the second support seat 42. By providing the first support base 41 and the second support base 42, the transmission assembly 4 can be first connected to form a whole, and then the whole is connected to the smoke collecting chamber assembly 1 and the upper flap assembly 21 respectively, thereby improving the convenience of installing the transmission assembly 4 and facilitating the relative position accuracy of the four transmission rods.

[0080] A pivot point b is formed between the first transmission rod 43 and the second transmission rod 44, a pivot point e is formed between the third transmission rod 45 and the fourth transmission rod 46, and a pivot point d is formed between the middle of the second transmission rod 44 and the middle of the fourth transmission rod 46. At this time, the four transmission rods, the upper flap assembly 21 and the smoke chamber assembly 1 form: a parallelogram 1 formed by the pivot points a, b, c, and d and an arbitrary quadrilateral 1 formed by the pivot points d, e, f, and g. When an external force pushes the upper flap assembly 21 from the inside to the outside, since the line segment ac of the parallelogram 1 is immovable, the line segment bd is horizontally translated outward, thereby causing the upper flap assembly 21 to produce a horizontal outward translation movement, and the arbitrary quadrilateral 1 rotates around the pivot point d, so that the upper flap assembly 21 flips outward, thereby realizing the composite movement of rotation and translation of the upper flap assembly 21.

[0081] Preferably, if Figure 6 As shown, the fourth transmission rod 46 is provided with a third limiting plane 461, which is used to limit the maximum angle of the upper flap assembly 21 to flip outwards, and also ensure that the upper flap assembly 21 is stable in position when it moves to the maximum angle. Fig.15 As shown, when the third limiting plane 461 abuts against the inner wall of the first support seat 41, the upper flap assembly 21 cannot rotate further counterclockwise. At this time, the upper flap assembly 21 is located at the maximum outward flipping position.

[0082] like Figure 5 and Figure 7As shown, the linkage assembly 5 includes a first link 53, a second link 54, a third link 55 and a fourth link 56, one end of the first link 53 is pivoted to the upper flap assembly 21, both ends of the second link 54 are pivoted to the other end of the first link 53 and the lower flap assembly 22 respectively, one end of the third link 55 is pivoted to the lower flap assembly 22, both ends of the fourth link 56 are pivoted to the other end of the third link 55 and the upper flap assembly 21 respectively, and the second link 54 and the fourth link 56 are cross-arranged and pivoted.

[0083] The range hood in this embodiment also includes a drive assembly 3, which is pivotally connected to the smoke collecting chamber assembly 1 and can output linear motion, and the output end of the drive assembly 3 is connected to the linkage assembly 5. In this embodiment, the upper flap assembly 21 and the lower flap assembly 22 form a mechanical linkage, and the drive assembly 3 can make the upper flap assembly 21 flip outward and inward relative to the smoke collecting chamber assembly 1, and make the lower flap assembly 22 flip outward and inward relative to the upper flap assembly 21. In this embodiment, through the cooperation of the drive assembly 3, the linkage assembly 5 and the transmission assembly 4, a driving source can be used to flip the upper flap assembly 21 and the lower flap assembly 22, thereby simplifying the internal structure of the range hood, which is conducive to the thinness of the range hood and can reduce the manufacturing cost of the range hood. In this embodiment, the drive assembly 3 is an electric push rod, which is pivotally connected to the smoke collecting chamber assembly 1, and the output end of the electric push rod is pivotally connected to the linkage assembly 5. Optionally, the output end of the driving assembly 3 is pivotally connected to any one of the first connecting rod 53, the second connecting rod 54, the third connecting rod 55 and the fourth connecting rod 56. Figure 5 As shown, a connecting hole is provided at one end of the first connecting rod 53 away from the first bracket 51, and the output end of the driving component 3 is connected to the connecting hole through a pin shaft.

[0084] Preferably, if Figure 5 , Figures 9 to 11 As shown, the linkage assembly 5 also includes a first bracket 51 and a second bracket 52, wherein the first bracket 51 is connected to the upper flap assembly 21, and the first connecting rod 53 and the fourth connecting rod 56 are pivotally connected to the first bracket 51 respectively, and form a pivot point A and a pivot point C, that is, the first connecting rod 53 and the fourth connecting rod 56 are pivotally connected to the upper flap assembly 21 through the first bracket 51. The second bracket 52 is connected to the lower flap assembly 22, and the second connecting rod 54 and the third connecting rod 55 are pivotally connected to the second bracket 52 respectively, and form a pivot point G and a pivot point F, that is, the second connecting rod 54 and the third connecting rod 55 are pivotally connected to the lower flap assembly 22 through the second bracket 52. By providing the first bracket 51 and the second bracket 52, the linkage assembly 5 can be first connected to form a whole, and then the whole can be connected to the upper flap assembly 21 and the lower flap assembly 22 respectively, which improves the convenience of installation of the linkage assembly 5 and facilitates ensuring the relative position accuracy of the four connecting rods. In this embodiment, as Figure 5 and Figure 8 As shown, since the first bracket 51 and the second support seat 42 are both connected to the upper flap assembly 21, the two can be used as an integrally formed structure.

[0085] like Figure 7 As shown, a pivot point B is formed between the first link 53 and the second link 54, a pivot point E is formed between the third link 55 and the fourth link 56, and a pivot point D is formed between the middle of the second link 54 and the middle of the fourth link 56. At this time, the four links, the upper flap assembly 21 and the lower flap assembly 22 constitute: a parallelogram 2 formed by the pivot points A, B, C, and D and an arbitrary quadrilateral 2 formed by the pivot points D, E, F, and G. When the driving assembly 3 pushes the linkage assembly 5 to move from the inside to the outside, the line segment BD of the parallelogram 2 translates relative to the upper flap assembly 21, so that the lower flap assembly 22 can translate relative to the upper flap assembly 21, and the arbitrary quadrilateral 2 rotates around the pivot point D, so that the lower flap assembly 22 rotates relative to the upper flap assembly 21. That is, the linkage assembly 5 of the present embodiment enables the lower flap assembly 22 to perform a compound movement of rotation and translation relative to the upper flap assembly 21, so that when the flap mechanism 2 closes the smoke inlet, the gap between the lower end of the upper flap assembly 21 and the upper end of the lower flap assembly 22 can be made small enough, and ensure that the lower flap assembly 22 will not interfere with the upper flap assembly 21 during the process of the flap mechanism 2 opening the smoke inlet.

[0086] Preferably, if Figure 7 As shown, the first link 53 is provided with a first limiting plane 531 and a second limiting plane 532, the first limiting plane 531 and the second limiting plane 532 are arranged at an angle, the first limiting plane 531 and the second limiting plane 532 can respectively abut against the first bracket 51, the first limiting plane 531 is used to limit the rotation angle of the first link 53 relative to the first bracket 51 along the first direction, the second limiting plane 532 is used to limit the rotation angle of the first link 53 relative to the first bracket 51 along the second direction, and then limit the flip angle of the lower flap assembly 22 relative to the upper flap assembly 21, the first direction and the second direction are opposite to each other. In this embodiment, the first direction is clockwise, and the second direction is counterclockwise.

[0087] Specifically, Figure 3 and Fig.10 As shown, when the first limiting plane 531 of the first connecting rod 53 abuts against the inner wall of the first bracket 51, the first connecting rod 53 rotates to the maximum clockwise position, at which time the upper flap assembly 21 connected to the first bracket 51 and the lower flap assembly 22 connected to the second bracket 52 are coplanar, and the smoke inlet is in the open state one; Figure 4 , Fig.11 and Fig.12As shown, when the second limiting plane 532 of the first connecting rod 53 abuts against the inner wall of the first bracket 51, the first connecting rod 53 rotates to the maximum counterclockwise position, and the lower flap assembly 22 flips outward to the maximum position relative to the upper flap assembly 21, and the smoke inlet is in the second open state. Figure 2 and Figure 7 As shown, when the range hood is in a non-operating state, that is, when the flap mechanism 2 is in a vertical plane, the first limiting plane 531 of the first connecting rod 53 abuts against the inner wall of the first bracket 51 .

[0088] When the output end of the driving assembly 3 extends, the linkage assembly 5 can be pushed outward to operate, thereby causing the upper flap assembly 21 to flip outward relative to the smoke collecting chamber assembly 1, gradually causing the range hood to reach the opening state 1; when the output end of the driving assembly 3 continues to extend, the lower flap assembly 22 flips outward relative to the upper flap assembly 21, thereby causing the range hood to reach the opening state 2. When the output end of the electric push rod retracts, the linkage assembly 5 can be pulled inward to operate, thereby causing the linkage assembly 5 and the transmission assembly 4 to operate, thereby causing the lower flap assembly 22 to flip inward relative to the upper flap assembly 21, and then causing the upper flap assembly 21 to flip inward relative to the smoke collecting chamber assembly 1, ultimately causing the range hood to reach the closed state.

[0089] The driving assembly 3 can cooperate with the transmission assembly 4 and the linkage assembly 5 to turn the flap mechanism 2 from Figure 2 The closed state shown eventually switches to Figure 4 The second open state shown, however, during the switching process, the flipping order of the upper flap assembly 21 and the lower flap assembly 22 cannot be uniquely determined, that is, during the opening process of the flap mechanism 2, the upper flap assembly 21 may be flipped outwards to a certain extent before the lower flap assembly 22 flips outwards, or the upper flap assembly 21 may be flipped outwards synchronously with the lower flap assembly 22, or the lower flap assembly 22 may be flipped outwards to a certain extent before the upper flap assembly 21 flips outwards. During the closing process of the flap mechanism 2, the lower flap assembly 22 may be flipped inwards to a certain extent before the upper flap assembly 21 flips inwards, or the upper flap assembly 21 may be flipped inwards to a certain extent before the lower flap assembly 22 flips inwards, or the upper flap assembly 21 may be flipped inwards to a certain extent before the lower flap assembly 22 starts to flip. That is, no matter the flap mechanism 2 is in the opening process or the closing process, the timing of the flipping action of the upper flap assembly 21 and the lower flap assembly 22 is not unique, which leads to a poor user experience.

[0090] In this regard, Figure 8As shown, the range hood of this embodiment also includes an opening and closing sequence adjustment component 6, which can provide resistance or assistance at different stages of the movement of the flap mechanism 2 relative to the smoke collecting chamber component 1, so that the upper flap assembly 21 and the lower flap assembly 22 have different opening and closing sequences and flipping trajectories.

[0091] In the range hood of this embodiment, by providing the opening and closing sequence adjustment component 6, the movement sequence of the upper flap component 21 and the lower flap component 22 at different stages can be controlled, thereby improving the user experience. In addition, combined with the output of the control drive component 3, the flap mechanism 2 can be kept at a certain position. Figure 3 The upper flap assembly 21 is flipped outward to the maximum angle relative to the smoke collecting chamber assembly 1, and the lower flap assembly 22 is in the same plane as the upper flap assembly 21. The flap mechanism 2 can also be kept in the following state: Figure 4 The upper flap assembly 21 is shown in the second opening state where it is turned outward to the maximum relative to the smoke collecting chamber assembly 1 and the lower flap assembly 22 is turned outward relative to the upper flap assembly 21 , which increases the user's choices and improves the user's experience.

[0092] Preferably, if Figures 2 to 5 As shown, the opening and closing sequence adjustment component 6 includes a second elastic member 65, one end of the second elastic member 65 is connected to the upper flap assembly 21, and the other end is connected to the lower flap assembly 22. The second elastic member 65 can generate resistance when the lower flap assembly 22 is turned outward, and can generate power when the lower flap assembly 22 is turned inward, so as to achieve the purpose of controlling the opening sequence of the control flap mechanism 2. Specifically, the second elastic member 65 is connected to the lower flap assembly 22 through the linkage assembly 5, and the second elastic member 65 can hinder the action of the linkage assembly 5 when the lower flap assembly 22 is turned outward, and can assist the action of the linkage assembly 5 when the lower flap assembly 22 is turned inward. When the driving assembly 3 pushes the linkage assembly 5, there is no additional obstruction force (or there is very little resistance) at the transmission assembly 4 at the upper end of the upper flap assembly 21, and the second elastic member 65 generates resistance to the action of the linkage assembly 5, so the transmission assembly 4 takes precedence over the linkage assembly 5, so the upper flap assembly 21 is preferentially turned outward relative to the smoke collecting chamber assembly 1. When the upper flap assembly 21 flips outward to the maximum angle, the driving assembly 3 is still outputting a driving force. When this driving force overcomes the resistance of the second elastic member 65 to the linkage assembly 5, the linkage assembly 5 starts to move, thereby causing the lower flap assembly 22 to flip outward relative to the upper flap assembly 21, thereby limiting the flipping order of the upper flap assembly 21 and the lower flap assembly 22.

[0093] Alternatively, if Figure 5As shown, one end of the second elastic member 65 is connected to the upper flap assembly 21, and the other end is connected to any one of the first connecting rod 53, the second connecting rod 54, the third connecting rod 55 and the fourth connecting rod 56. In this embodiment, the second elastic member 65 is a tension spring, and when the flap mechanism 2 of the range hood is in the closed state, the second elastic member 65 is tensioned between the upper flap assembly 21 and the linkage assembly 5 with a certain pre-tightening force, so as to immediately generate resistance to the linkage assembly 5 when the driving assembly 3 just starts to push the linkage assembly 5.

[0094] Preferably, one end of the second elastic member 65 is hooked on the second support seat 42, that is, the first bracket 51, and the other end is hooked on the linkage assembly 5, and the distance between the two hooking points is greater than the length of the second elastic member 65, so that the second elastic member 65 is tensioned between the upper flap assembly 21 and the linkage assembly 5 when the flap mechanism 2 is in a non-working state. A hooking portion is provided on the first bracket 51, and one end of the second elastic member 65 is hooked on the hooking portion. Optionally, the hooking portion is a V-shaped hook hole, which can prevent one end of the second elastic member 65 from shaking left and right, thereby improving the connection stability of the second elastic member 65. Furthermore, a connecting hole is provided on the first connecting rod 53, and the other end of the second elastic member 65 is hooked on the connecting hole. The connecting hole is preferably a round hole. Since the first limiting plane 531 of the first connecting rod 53 abuts against the inner wall of the first bracket 51, the distance between the hook portion and the connecting hole is greater than the length of the second elastic member 65. Therefore, the second elastic member 65 is in a state of continuous tension and the first limiting plane 531 is kept in close contact with the inner wall of the first bracket 51. Fig. 9 As shown, the angle between the second elastic member 65 and the vertical plane is β1 (0≦β1≦45°), and the angle between the first bracket 51 (the second support seat 42) and the first support seat 41 is α1 (45≦α1≦120°). In other embodiments, the second elastic member 65 can also be connected to the second connecting rod 54, the third connecting rod 55 or the fourth connecting rod 56, which is not specifically limited here.

[0095] like Figure 8 As shown, the opening and closing sequence adjustment component 6 also includes a first elastic member 62, which is connected to the smoke collecting chamber component 1, acts on the upper flap component 21 and is initially in a compressed state, and can provide assistance or resistance to the upper flap component 21 when the upper flap component 21 flips over. In this embodiment, the first elastic member 62 is a spring, and when the flap mechanism 2 of the range hood is in a closed state, the first elastic member 62 is in a compressed state, so that assistance is immediately generated when the driving component 3 just starts to push the first bracket 51.

[0096] Furthermore, the opening and closing sequence adjustment component 6 also includes a connecting component 61, and the connecting component 61 is pivotally connected to the transmission component 4. Specifically, the connecting component 61, the first transmission rod 43 and the second transmission rod 44 are pivotally connected at the same point. The first elastic member 62 can provide assistance or resistance to the connecting component 61 when the upper flap assembly 21 is turned outward or inward. By setting the connecting component 61 and the first elastic member 62, the transmission of the transmission component 4 can be limited, thereby ensuring the accurate transmission of the transmission component 4.

[0097] like Fig.10 As shown, when the driving component 3 pushes the first bracket 51 to flip outward through the first connecting rod 53, the compressed first elastic member 62 begins to stretch due to the loss of the tightening resistance of the driving component 3 and pushes the transmission component 4 to transmit through the connecting component 61, so that the first bracket 51 (second support seat 42) flips outward until the angle between the first bracket 51 (second support seat 42) and the first support seat 41 is α1+β1 (90≦α1+β1≦150°). During this process, the elastic force of the first elastic member 62 acts as an assist during opening.

[0098] Combination Fig. 9 and Fig.10 As shown, since the second elastic member 65 is continuously in a state of tension and stress and the first limiting plane 531 of the first connecting rod 53 is in close contact with the inner wall of the first bracket 51, when the driving assembly 3 pushes the first connecting rod 53 to rotate, in the tangent direction of the arc motion with the connection point x between the first connecting rod 53 and the first bracket 51 as the center and the connection point y1 between the driving assembly 3 and the first connecting rod 53 as the radius, the component force Fa2 of the driving assembly 3 on the tangent is smaller than the component force Fb2 of the second elastic member 65 in the opposite direction of the pulling force Fb0 on the tangent, that is, Fb2≧Fa2, so the second elastic member 65 acts as a resistance to the tangential motion of the first connecting rod 53 at this time. At the same time, since the second bracket 52 is controlled by the first connecting rod 53 driving the second connecting rod 54 and the fourth connecting rod 56 to control the flipping trajectory, the second elastic member 65 at this time ensures the relative static and parallel state of the second bracket 52 and the first bracket 51. At this time, the flap mechanism 2 is in the open state one, that is, the range hood is in the open state one.

[0099] Furthermore, if Figures 10 to 12As shown, the driving assembly 3 continues to increase the thrust to push the first connecting rod 53 to drive the second connecting rod 54 and the fourth connecting rod 56 to control the flipping of the second bracket 52, until the component force Fa11 of the thrust Fa10 of the driving assembly 3 on the tangent is greater than the component force Fb11 of the second elastic member 65 in the opposite direction of the pulling force Fb10 on the tangent (i.e., Fa11≦Fb11), the first connecting rod 53 starts to move around the arc centered on point x, and drives the second bracket 52 to flip, until the second limiting plane 532 set on the first connecting rod 53 is in close contact with the inner wall of the first bracket 51, and the second bracket 52 stops when the angle between the first bracket 51 and the first bracket 51 is β2 (135≦β2≦180°), during which the first elastic member 62 does not work, and the second elastic member 65 acts as a resistance to the flipping movement of the second bracket 52. At this time, the flap mechanism 2 is in the second open state, that is, the range hood is in the second open state.

[0100] During the entire movement of the flap mechanism 2, the opening and closing sequence and the turning trajectory of the flap mechanism 2 at different stages are controlled by the continuous change between the assisting force and the resisting force of the second elastic member 65 and the first elastic member 62.

[0101] like Figure 8 As shown, the opening and closing sequence adjustment component 6 also includes a slide rail 63 and a slider 64, wherein the slide rail 63 is fixed to the first support seat 41, the slider 64 is slidably matched with the slide rail 63, and one end of the connecting component 61 is pivotally connected to the slider 64, and the other end is pivotally connected to the transmission component 4. Through the cooperation of the slide rail 63 and the slider 64, the movement direction of the connecting component 61 is limited, thereby limiting the movement of the transmission component 4. Optionally, the slide rail 63 is a linear guide rail, and the slider 64 is slidably matched with the linear guide rail.

[0102] The two ends of the first elastic member 62 act on the smoke collecting chamber assembly 1 and the slider 64 respectively, so that the slider 64 always has a tendency to move toward the upper flap assembly 21. When the driving assembly 3 starts to move, the elastic force of the first elastic member 62 acts on the slider 64, providing assistance to the transmission assembly 4 through the connecting assembly 61.

[0103] Furthermore, the slider 64 is provided with a receiving cavity, and the first elastic member 62 is received in the receiving cavity along the axial direction of the receiving cavity. By providing the receiving cavity, the first elastic member 62 is more stable during use, and is prevented from displacement or warping. Preferably, two first elastic members 62 are provided, and the slider 64 is provided with two receiving cavities symmetrically distributed about its axial direction, and a first elastic member 62 is provided in each receiving cavity, that is, the slider 64 is provided with a receiving cavity on the left and right sides of its axis. The two first elastic members 62 are separated in the left and right cavities of the slider 64 in a side-by-side manner, and elastically deform at the same time to synchronously provide assistance or resistance to the transmission assembly 4, so that the movement of the transmission assembly 4 is more stable and reliable.

[0104] The opening and closing sequence adjustment assembly 6 also includes a first guide member 66 and a second guide member 67, which are respectively arranged at the two ends of the accommodating cavity in the axial direction, and the two ends of the first elastic member 62 are respectively sleeved on the first guide member 66 and the second guide member 67. The first guide member 66 and the second guide member 67 are both provided to guide the first elastic member 62 when it moves.

[0105] Specifically, the first guide member 66 is disposed at one end of the slider 64 close to the transmission assembly 4, and the second guide member 67 is disposed at one end of the slider 64 away from the transmission assembly 4. The first guide member 66 is used to guide the first elastic member 62 during its telescopic movement, so as to prevent it from being skewed or dislodged during the movement, resulting in a change in force. The second guide member 67 is inserted into the wire diameter hole of the first elastic member 62, and is used to guide the first elastic member 62 when the slider 64 moves forward and dislodged from the accommodating cavity.

[0106] Optionally, the first guide member 66 is a guide column, and one end of the first elastic member is sleeved on the guide column. The guide column can be integrally formed with the slider 64. The second guide member 67 is detachably connected to the first support seat 41, which is convenient for replacing the second guide member 67. Specifically, the second guide member 67 can be a screw, one end of which is fixed to the first support seat 41 by a nut 68, and the other end is inserted into the wire diameter hole of the first elastic member 62. In the axial direction of the first elastic member 62, the first guide member 66 and the second guide member 67 cooperate with each other to play a good guiding role in the movement of the first elastic member 62.

[0107] Preferably, the length of the second guide member 67 extending into the first elastic member 62 is not less than the length of the first guide member 66 extending into the first elastic member 62. Since the first elastic member 62 is always in a compressed state in the present embodiment, its extended end, i.e., the end connected to the first guide member 66, can always be sleeved on the outer periphery of the first guide member 66 and abut against the inner wall of the slider 64. Therefore, the length of the first guide member 66, i.e., the length of the first guide member 66 extending into the first elastic member 62, can be sufficient to clamp the end of the first elastic member 62, and does not need to be designed to be too long. The length of the second guide member 67, i.e., the length of the second guide member 67 extending into the first elastic member 62, cannot be too short, so as to prevent the slider 64 from moving forward and escaping from the accommodating cavity, and maintain the guiding effect on the first elastic member 62. Therefore, the length of the second guide member 67 along the axial direction of the accommodating cavity is generally designed to be longer, while the length of the first guide member 66 along the axial direction of the accommodating cavity is generally designed to be shorter, so that the length of the second guide member 67 extending into the first elastic member 62 is not less than the length of the first guide member 66 extending into the first elastic member 62, and the two together realize the guiding effect on the first elastic member 62.

[0108] Continue as Figure 8As shown, the connecting assembly 61 includes a connecting rod 611, one end of which is connected to the second guide member 67, and the other end is pivoted to any one of the first transmission rod 43, the second transmission rod 44, the third transmission rod 45, and the fourth transmission rod 46. In this embodiment, one end of the connecting rod 611 is pivoted to the second guide member 67 through a rivet shaft 612, and the other end of the connecting rod 611 can be pivoted to the pivot axis between the first transmission rod 43 and the second transmission rod 44, that is, the connecting rod 611, the first transmission rod 43 and the second transmission rod 44 are pivoted at the same point.

[0109] When the driving component 3 drives the flap mechanism 2 from the open state 2 to the closed state, although the second elastic member 65 can assist the action of the linkage component 5 to a certain extent, if the resistance at the transmission component 4 is very small or close to zero, the timing of closing the upper flap component 21 and the lower flap component 22 cannot be determined, resulting in a poor user experience.

[0110] In this regard, in this embodiment, the first elastic member 62 can also generate a damping force on the first bracket 51 of the transmission assembly when the upper flap assembly 21 flips inward, thereby ensuring that the upper flap assembly 21 flips inward after the lower flap assembly 22 flips inward to be coplanar with the upper flap assembly 21. The action sequence of the upper flap assembly 21 and the lower flap assembly 22 is uniquely determined, thereby improving the user experience.

[0111] Furthermore, when the working state of the range hood changes from a strong gear to a weak gear, that is, from the opening state 2 to the opening state 1, combined with Fig.12 As shown, the drive assembly 3 contracts and drives the first connecting rod 53 to drive the second bracket 52 to flip inward through the second connecting rod 54 and the fourth connecting rod 56. At this time, when the component force Fa21 of the thrust Fa20 of the drive assembly 3 on the tangent is in the same direction as the component force Fb21 of the pulling force Fb20 of the second elastic member 65 in this direction, that is, when the driving force is Fa21+Fb21, the first connecting rod 53 starts to make a circular arc motion around the point x as the center, and drives the second bracket 52 to flip until the first limiting plane 531 set on the first connecting rod 53 is tightly attached to the inner wall of the first bracket 51, and the second bracket 52 stops when it is parallel to the first bracket 51, that is, the lower flap assembly 22 flips inward to be coplanar with the upper flap assembly 21. At this time, the flap mechanism 2 is in the open state one, that is, the range hood is in the open state one. In this process, since the component force Fa31 of the driving assembly 3 in the horizontal direction is smaller than the sum of the elastic forces 2FC2 of the two first elastic members 62 (i.e., Fa31<2FC2), the first bracket 51 does not rotate. In this process, the first elastic member 62 acts as a resistance to the flipping movement of the first bracket 51, while the second elastic member 65 provides assistance to the flipping movement of the second bracket 52, that is, it plays a control role in controlling the separate movement of the first bracket 51 and the second bracket 52.

[0112] As the driving assembly 3 continues to contract and Fa20 continues to increase until Fa21+Fb21>2FC2, the first bracket 51 will be retracted to the vertical direction and stop moving, and the flip mechanism 2 will be in a closed state. During this process, the first elastic member 62 is continuously compressed, and its elastic force acts as a resistance and continues to increase, acting as a resistance to the flipping movement of the first bracket 51.

[0113] In summary, in this embodiment, by setting the second elastic member 65 and the first elastic member 62, during the entire movement process of the flip mechanism 2, the second elastic member 65 and the first elastic member 62 can continuously change between the assisting force and the resisting force, thereby realizing the control of the opening and closing sequence and the flipping trajectory of the flip mechanism 2 at different stages, thereby improving the user experience.

[0114] like Fig.13 As shown, the range hood also includes a smoke inlet plate assembly 23, which can abut against the inner surface of the upper flap assembly 21 when the smoke inlet is closed, and can be supported at the smoke inlet when the smoke inlet is opened. In this process, the movement mechanism of the range hood needs to be extended and retracted to realize the opening and closing movement of the flap mechanism 2. Therefore, the second connecting rod 54, the third connecting rod 55, the fourth connecting rod 56 and the second bracket 52 will all pass through the holes and slots opened on the smoke inlet plate assembly 23. In order to meet the 3C safety requirements of kitchen appliances, the width of the holes and slots must be designed to be less than the preset safety value; further, the connection structure between the flap mechanisms 2, that is, the gap between the connecting rods of the linkage assembly 5 in different working states, must also meet this requirement. According to the standard requirements of IEC61032&GB16842, the diameter of the simulated test finger of the range hood in the IP protection test is 12mm, and dangerous parts cannot be touched, that is, the above-mentioned preset safety value can be 12mm.

[0115] When the flap mechanism is in the open state, Fig.14 and Fig.15 As shown, an angle area O is formed between the lower flap assembly 22 and the smoke inlet plate assembly 23. Within the angle area O, the smoke inlet plate assembly 23, the second connecting rod 54, the third connecting rod 55 and the second bracket 52 together form a hollow area. In the prior art, the maximum size of the hollow area is greater than the preset safety value, i.e., 12 mm. Moreover, since the four sides forming the hollow area are all moving parts, the size of the hollow area will change during movement, and there is a risk of squeezing or cutting fingers, which does not meet the 3C safety requirements for kitchen appliances.

[0116] In order to solve the above problems in the prior art without affecting the function of the linkage assembly 5, the third connecting rod 55 is adjusted from the existing straight line structure to a polygonal structure in this embodiment, so that the third connecting rod 55 can divide the hollow area into a plurality of sub-areas, and the diameter of the inscribed circle of any sub-area is smaller than the preset safety value, that is, the diameter of any inscribed circle of the hollow area is smaller than 12 mm. Fig.15 Middle H region and I region.

[0117] Preferably, the cross-sectional shape of the third connecting rod 55 is a triangle, and the two ends of a straight side of the third connecting rod 55 are respectively pivotally connected to the second bracket 52 and the fourth connecting rod 56, and the corners opposite to the straight side are located in the hollow area. The corners of the triangle can spatially divide the hollow area, and the triangular structure has good stability.

[0118] When the flap mechanism 2 is in the open state 2, Fig.16 and Fig.17 As shown, as the lower flap assembly 22 continues to flip outward, the gaps between the connecting rods continue to shrink, and an angle area P is formed between the lower flap assembly 22 and the smoke inlet plate assembly 23. In the angle area P, the hollow area is surrounded by the second connecting rod 54, the fourth connecting rod 56, the third connecting rod 55 and the second bracket 52. When the third connecting rod 55 of the polygonal structure divides the hollow area into spaces, there is no interference between the third connecting rod 55 and the second bracket 52 and the second connecting rod 54, respectively, so that the maximum size of the maximum area J of the hollow area is less than the preset safety value, that is, the diameter of any inscribed circle of the hollow area is less than 12 mm.

[0119] In this embodiment, if Fig.13 As shown, the smoke inlet plate assembly 23 includes an air inlet plate 231 and a lower shield 232, wherein the air inlet plate 231 is connected to the lower shield 232, one end of the lower shield 232 is pivotally connected to the smoke collecting chamber assembly 1, and the other end is transmission-connected to the upper flap assembly 21. When the upper flap assembly 21 and the lower flap assembly 22 block the smoke inlet, the air inlet plate 231 is located inside the smoke collecting chamber assembly 1 and abuts against the inner surface of the upper flap assembly 21. When the upper flap assembly 21 flips outward, the air inlet plate 231 rotates relative to the smoke collecting chamber assembly 1 and rotates to the position shown in FIG. Fig.13 The support is shown at the position of the smoke inlet. The air inlet plate 231 is provided with a through hole, and the through hole on the air inlet plate 231 is used for air flow to pass through when the range hood is in the first and second opening states.

[0120] Preferably, combined Figure 3 and Figure 4As shown, the lower shield 232 includes a transmission plate 2321 and a shield body 2322, wherein one end of the transmission plate 2321 is pivotally connected to the smoke collecting chamber assembly 1, and the other end is pivotally connected to the upper flap assembly 21, the shield body 2322 is fixedly connected to the transmission plate 2321, the air inlet plate 231 is fixedly connected to the shield body 2322, the shield body 2322 and the transmission plate 2321 are surrounded to form a receiving cavity, and at least part of the linkage assembly 5 is arranged in the receiving cavity. Optionally, the shield body 2322 and the transmission plate 2321 are connected by fasteners.

[0121] Specifically, Fig.18 As shown, the shield body 2322 includes a front panel 23221 and two side panels 23222 arranged on the left and right sides of the front panel 23221. The front panel 23221 and the two side panels 23222 are arranged to form a U-shaped structure, and the transmission plate 2321 blocks the opening of the U-shaped structure, so that the partial linkage assembly 5 can be fully protected by the shield. Fig.18 As shown, the front panel 23221 is coplanar with the air inlet plate 231, thereby improving the aesthetics of the range hood. Fig.15 As shown, the side panel 23222, the second connecting rod 54, the third connecting rod 55 and the second bracket 52 together form a hollow area.

[0122] Preferably, continue to see Fig.18 As shown, the front panel 23221 is provided with a first avoidance opening 23223 for part of the linkage assembly 5 to pass through, one end of the linkage assembly 5 is connected to the inner surface of the upper flap assembly 21, and the other end passes through the first avoidance opening 23223 and is connected to the inner surface of the lower flap assembly 22. In this embodiment, the second connecting rod 54, the third connecting rod 55, the fourth connecting rod 56 and the second bracket 52 all pass through the first avoidance opening 23223, thereby achieving connection with the lower flap assembly 22. The maximum width of the first avoidance opening 23223 is less than the preset safety value.

[0123] Furthermore, in order to make the maximum width of the first avoidance opening 23223 meet the safety requirements, the rotary riveting process is used at the shaft connection of each structural member in the linkage assembly 5 to replace the traditional connection methods such as pins or rivets, so that the width of the connection is minimized. Specifically, the first connecting rod 53 and the second connecting rod 54, the second connecting rod 54 and the fourth connecting rod 56, and the third connecting rod 55 and the fourth connecting rod 56 are all connected by a rotary riveting shaft; the first connecting rod 53 and the fourth connecting rod 56 are respectively connected to the first bracket 51 by a rotary riveting shaft, and the second connecting rod 54 and the third connecting rod 55 are respectively connected to the second bracket 52 by a rotary riveting shaft.

[0124] In addition, if Fig.19As shown, the second bracket 52 is fixed to the front of the lower flap assembly 22 by a fastener, and the fastener may be a screw 7. The second bracket 52 and the lower flap assembly 22 are fixed by the side or built-in fixing method to the front screw 7 fastening method, so that the linkage assembly 5 can be manufactured in an integrated manner, which greatly improves the overall accuracy of the linkage assembly 5, greatly simplifies the installation process, and reduces the production cost.

[0125] Embodiment 2

[0126] The present embodiment provides a range hood, the structure of which is basically the same as that of the range hood in the above-mentioned embodiment 1, with the difference that the first elastic member 62 in the opening and closing sequence adjustment component 6 is initially in and always in a stretched stress state, and the tension of the second elastic member 65 is adjusted, so that the opening and closing sequence of the flap mechanism 2 can be controlled and adjusted by controlling the elastic force direction of the first elastic member 62 and the tension of the second elastic member 65, that is, the purpose of controlling the opening and closing sequence and the flipping trajectory of the flap mechanism 2 by only simple force adjustment is achieved.

[0127] like Figure 20 to Figure 22 As shown, the initial tension of the first elastic member 62 is set to FC0, and the tension of the second elastic member 65 is adjusted to Fb30 simultaneously. When the range hood is opened in the weak gear, the driving component 3 makes an arc motion through the first connecting rod 53 with the connection point x of the first connecting rod 53 and the first bracket 51 as the center and the connection point y1 of the driving component 3 and the first connecting rod 53 as the radius in the tangential direction. The component force Fa32 of the thrust Fa30 of the driving component 3 on the tangent is greater than the component force Fb32 of the second elastic member 65 in the opposite direction of the tangent tension Fb30, that is, Fa32≧Fb32. At this time, the first connecting rod 53 starts to move around the arc with point x as the center, and drives the second bracket 52 to flip until the second limiting plane 532 set on the first connecting rod 53 is tightly attached to the inner wall of the first bracket 51, and the angle between the second bracket 52 and the first bracket 51 is β2 (135≦β2≦180°), so that the lower flap assembly 22 opens first. At this time, it is the weak gear mode, that is, the range hood is in the opening state three. During this process, since the pulling force of the first elastic member 62 is greater than the force applied to the first bracket 51 by the driving component 3 in the horizontal direction, that is, 2FC0>Fa30*cosα2 (α2 is the angle between the driving component 3 and the horizontal direction), the first bracket 51 does not move during this process, that is, the first elastic member 62 acts as a resistance to the flipping movement of the first bracket 51.

[0128] Furthermore, when the working state of the range hood changes from weak gear to strong gear, the driving assembly 3 continues to increase the thrust, and the force applied by the driving assembly 3 to the first bracket 51 in the horizontal direction exceeds the pulling force of the first elastic member 62, that is, 2FC0<Fa30*cosα2 (α2 is the angle between the driving assembly 3 and the horizontal direction), and the first bracket 51 starts to move outward in an arc until the third limiting plane 461 on the fourth transmission rod 46 is in close contact with the inner wall of the first support seat 41 and stops moving. In this process, since the second limiting plane 532 set on the first connecting rod 53 is always in close contact with the inner wall of the first bracket 51, the second bracket 52 and the first bracket 51 remain relatively stationary in this process. At this time, the flap mechanism 2 is in the second open state, that is, the range hood is in the second open state.

[0129] In this embodiment, the purpose of controlling the opening and closing sequence and the turning trajectory of the flap mechanism 2 is achieved by adjusting the elastic force direction of the first elastic member 62 and the pulling force of the second elastic member 65 .

[0130] It should be noted that Fig.21 The state in which the upper flap assembly 21 is not turned over relative to the smoke collecting chamber assembly 1, and the lower flap assembly 22 is turned outward to the maximum angle relative to the upper flap assembly 21 is defined as the opening state 3 of the range hood. In the opening state 3, the negative pressure area formed outside the smoke inlet is the smallest, that is, the negative pressure area formed outside the smoke inlet is arranged from large to small as follows: opening state 2> opening state 1> opening state 3. Therefore, the oil fume extraction effect of opening state 3 is the worst, and opening state 3 can correspond to the weak gear of the range hood, so opening state 3 is suitable for users to use in cooking activities with little oil fume.

[0131] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the field, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scopes, and the content of this specification should not be understood as limiting the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A range hood, characterized in that: include: A smoke collecting chamber assembly (1) is provided with a smoke inlet; A flap mechanism (2) is used to close or open the smoke inlet, the flap mechanism (2) comprising an upper flap assembly (21) and a lower flap assembly (22), the upper flap assembly (21) being connected to the smoke collecting chamber assembly (1), and the lower flap assembly (22) being connected to the lower end of the upper flap assembly (21) via a linkage assembly (5); and, a smoke inlet plate assembly (23), the smoke inlet plate assembly (23) being supported at the smoke inlet port; The flap mechanism (2) has an open state 1 and an open state 2. In the open state 1, the diameter of any inscribed circle of the hollow area enclosed by the smoke inlet plate assembly (23), the linkage assembly (5), and the lower flap assembly (22) is smaller than a preset safety value; or in the open state 2, the diameter of any inscribed circle of the hollow area enclosed by the linkage assembly (5) and the lower flap assembly (22) is smaller than the preset safety value.

2. The range hood according to claim 1, wherein: The smoke inlet plate assembly (23) comprises: A smoke inlet plate (231) and a lower shield (232), wherein the smoke inlet plate (231) is connected to the lower shield (232), one end of the lower shield (232) is pivotally connected to the smoke collecting chamber assembly (1), and the other end is transmission-connected to the upper flap assembly (21), so that the smoke inlet plate (231) abuts against the inner surface of the upper flap assembly (21) when the smoke inlet is closed, and is supported at the smoke inlet when the smoke inlet is opened; in the first open state, the lower shield (232), the linkage assembly (5) and the lower flap assembly (22) together enclose the hollow area.

3. The range hood according to claim 2, wherein: The linkage assembly (5) comprises a first link (53), a second link (54), a third link (55) and a fourth link (56); one end of the first link (53) is pivotally connected to the upper flap assembly (21); two ends of the second link (54) are respectively pivotally connected to the other end of the first link (53) and the lower flap assembly (22); one end of the third link (55) is pivotally connected to the lower flap assembly (22); two ends of the fourth link (56) are respectively pivotally connected to the other end of the third link (55) and the upper flap assembly (21); the second link (54) and the fourth link (56) are cross-arranged and pivotally connected; In the first open state, the lower shield (232), the second connecting rod (54), the third connecting rod (55), and the lower flap assembly (22) together form the hollow area; In the second opening state, the second connecting rod (54), the fourth connecting rod (56), the third connecting rod (55) and the lower flap assembly (22) together form the hollow area.

4. The range hood according to claim 3, wherein: The linkage component (5) further comprises: a first bracket (51), the first bracket (51) being connected to the upper flap assembly (21), the first connecting rod (53) and the fourth connecting rod (56) being pivotally connected to the first bracket (51), respectively; and a second bracket (52), the second bracket (52) being connected to the lower flap assembly (22), the second connecting rod (54) and the third connecting rod (55) being pivotally connected to the second bracket (52) respectively; In the first opening state, the lower shield (232), the second connecting rod (54), the third connecting rod (55) and the second bracket (52) together form the hollow area; in the second opening state, the second connecting rod (54), the fourth connecting rod (56), the third connecting rod (55) and the second bracket (52) together form the hollow area.

5. The range hood according to claim 4, wherein: The third connecting rod (55) is a polygonal structure, so as to divide the hollow area into a plurality of sub-areas, and the diameter of the inscribed circle of any sub-area is smaller than the preset safety value.

6. The range hood according to claim 5, wherein: The cross-section of the third connecting rod (55) is triangular, and the two ends of a straight side of the third connecting rod (55) are pivotally connected to the second bracket (52) and the fourth connecting rod (56) respectively, and the corner opposite to the straight side is located in the hollow area.

7. The range hood according to claim 4, wherein: The first connecting rod (53) and the second connecting rod (54), the second connecting rod (54) and the fourth connecting rod (56), and the third connecting rod (55) and the fourth connecting rod (56) are all connected via a rivet shaft; the first connecting rod (53) and the fourth connecting rod (56) are respectively connected to the first bracket (51) via a rivet shaft, and the second connecting rod (54) and the third connecting rod (55) are respectively connected to the second bracket (52) via a rivet shaft.

8. The range hood according to claim 4, wherein: The second bracket (52) is fixed to the front side of the lower flap assembly (22) via fasteners.

9. The range hood according to claim 4, wherein: The lower shield (232) includes: A transmission plate (2321), one end of which is pivotally connected to the smoke collecting chamber assembly (1), and the other end of which is pivotally connected to the upper flap assembly (21); and The shield body (2322) is fixedly connected to the transmission plate (2321), the smoke inlet plate (231) is fixedly connected to the shield body (2322), the shield body (2322) and the transmission plate (2321) are surrounded to form a receiving cavity, and at least part of the linkage assembly (5) is arranged in the receiving cavity; In the first open state, the shield body (2322), the second connecting rod (54), the third connecting rod (55) and the second bracket (52) together form the hollow area.

10. The range hood according to claim 9, wherein: The shield body (2322) includes a front panel (23221) and two side panels (23222) arranged on the left and right sides of the front panel (23221). The front panel (23221) and the two side panels (23222) are arranged to form a U-shaped structure. The transmission plate (2321) blocks the opening of the U-shaped structure. The front panel (23221) is coplanar with the smoke inlet plate (231). When in the open state, the side panels (23222), the second connecting rod (54), the third connecting rod (55) and the second bracket (52) together form the hollow area.

11. The range hood according to claim 10, wherein: The front panel (23221) is provided with a first avoidance opening (23223) for part of the linkage assembly (5) to pass through, and the maximum width of the first avoidance opening (23223) is smaller than the preset safety value.

12. The range hood according to any one of claims 1 to 11, characterized in that: The preset safety value is 12 mm.

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