A kind of opening and closing mechanism and range hood

Abstract

This invention provides an opening and closing mechanism, including a transmission assembly, a connecting rod assembly, and a flap assembly. A first end of the connecting rod assembly is fixedly connected to the transmission assembly, and a second end is movably connected to the flap assembly. The transmission assembly can drive the connecting rod assembly to rotate, thereby opening or closing the flap assembly. An adhesive plate is fixedly connected to the inner side of the flap assembly. The adhesive plate has a connecting portion extending towards the connecting rod assembly, and the second end of the connecting rod assembly is detachably connected to the connecting portion. This invention's opening and closing mechanism uses a detachable connection between the adhesive plate and the connecting rod assembly to achieve a detachable connection between the flap assembly and the connecting rod assembly, allowing for direct disassembly of the flap assembly and the connecting rod assembly, facilitating the cleaning of internal components.

Description

Technical Field

[0001] This utility model belongs to the field of electrical appliance technology, specifically relating to an opening and closing mechanism and a range hood. Background Technology

[0002] Range hoods are core kitchen appliances. Their main function is to use a motor-driven fan to quickly expel cooking fumes, heat, and odors generated during cooking, while reducing grease buildup and air pollution in the kitchen, ensuring a clean environment and protecting human health. This is especially important in high-fume scenarios like stir-frying in Chinese cuisine, where they maintain air circulation. Currently, there are two main types of household range hoods: top-mounted and side-mounted. Side-mounted range hoods often feature an openable / closeable flap with an integrated control panel. When in use, the flap opens and the fan starts to draw away the fumes. Compared to top-mounted range hoods, side-mounted range hoods can extract fumes at closer range. Furthermore, their angled design, positioned to the side of the stove rather than directly above it, allows for greater head movement during operation, reducing the risk of bumps and creating a more user-friendly experience.

[0003] However, side-draft range hoods also have some usage issues. Because they are closer to the source of cooking fumes, they absorb a larger volume of fumes, thus requiring more frequent cleaning. Firstly, the flap is often made of glass or stainless steel, which easily forms an oil film on its surface, necessitating daily cleaning. Secondly, after prolonged use, a deep cleaning of the ductwork and the entire unit is required, but the flap structure of side-draft range hoods makes disassembly for cleaning difficult. Furthermore, the glass panel flap is relatively heavy, and the existing support arms for the flap lack sufficient rigidity, leading to unstable swaying during operation. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an opening and closing mechanism that is easy to disassemble and operates stably, and a range hood using the opening and closing mechanism.

[0005] To solve the above-mentioned technical problems, this utility model provides an opening and closing mechanism, including a transmission assembly, a connecting rod assembly, and a flap assembly;

[0006] The first end of the linkage assembly is fixedly connected to the transmission assembly, and the second end is movably connected to the flap assembly. The transmission assembly can drive the linkage assembly to rotate so as to drive the flap assembly to open or close.

[0007] An adhesive plate is fixedly connected to the inner side of the flap assembly. The adhesive plate is provided with a connecting part extending toward the connecting rod assembly. The second end of the connecting rod assembly is detachably connected to the connecting part.

[0008] Preferably, the linkage assembly includes a first linkage and a second linkage, the first linkage and the second linkage are connected by a second movable pin, and the first linkage and the second linkage are rotatable relative to the second movable pin;

[0009] The first link is fixedly connected to the transmission assembly. When the transmission assembly drives the first link to rotate, it can drive the second link to move forward or backward, thereby driving the flap assembly to open or close.

[0010] Preferably, the second link is connected to the connecting part by a first movable pin, the first movable pin passing through the second link and the connecting part, and the second link is rotatable relative to the connecting part;

[0011] A detachable retaining ring is also provided at the end of the first movable pin. When the retaining ring is engaged with the first movable pin, the first movable pin is fixed relative to the connecting part.

[0012] Preferably, the first connecting rod is a U-shaped connecting rod with one end open, the open end facing the second connecting rod. The first connecting rod includes a first arm and a second arm, and the second connecting rod includes a left connecting rod and a right connecting rod. The left connecting rod and the right connecting rod are respectively disposed on the inner sides of the first arm and the second arm. The second movable pin passes through the first arm, the left connecting rod, the right connecting rod and the second arm in sequence to movably connect the first connecting rod and the second connecting rod.

[0013] This utility model also provides a range hood, which includes a duct box, a smoke collection chamber assembly, and an opening and closing mechanism as described in any of the above claims, wherein the duct box, the smoke collection chamber assembly, and the opening and closing mechanism are fixedly connected in sequence.

[0014] The flip-plate assembly also includes a rotating fixed base, a rotating shaft assembly, and shaft pins. The rotating shaft assembly is fixedly connected to the upper part of the flip-plate assembly, and the shaft pins are respectively disposed at both ends of the rotating shaft assembly.

[0015] The rotating fixed base includes a fixed part and a rotating part. The shaft pin is movably connected to the rotating part. The fixed part extends into the smoke collection chamber assembly and is fixedly connected to the smoke collection chamber assembly. The flap assembly can rotate around the shaft pin.

[0016] Preferably, the smoke collection chamber assembly is provided with an air inlet and a grille on the side facing the flap assembly, the first end of the transmission assembly and the connecting rod assembly are disposed in the smoke collection chamber assembly, and the second end of the connecting rod assembly passes through the grille and is connected to the flap assembly;

[0017] When the flap assembly is closed, it covers the air inlet and the grille; when the flap assembly is open, a smoke-collecting chamber is formed between the flap assembly and the air inlet.

[0018] Preferably, the angle formed between the flap assembly and the grid plate is the opening angle of the flap assembly, and the maximum opening angle is 90°-110°.

[0019] Preferably, an oil collector is also provided at the lower part of the smoke collection chamber assembly. When the flap assembly is opened and reaches its maximum opening angle, the height of the lowest point of the lower end of the flap assembly is higher than the height of the oil collector.

[0020] Preferably, the transmission assembly includes a driver, a driver bracket, and an air guide bracket, wherein the driver bracket is fixedly connected to the driver;

[0021] The driver bracket is provided with a connecting flange, and the driver bracket is fixedly connected to the inner wall of the smoke collection chamber assembly through the connecting flange;

[0022] The air guide bracket is disposed on the side of the driver facing the air inlet. The air guide bracket is fixedly connected to the driver bracket. The air guide bracket is provided with a windproof flange facing the driver.

[0023] Preferably, the smoke collection chamber assembly is further provided with a lighting assembly, the lighting assembly including a lamp plate bracket and a lighting panel, the lamp plate bracket being disposed in the inner cavity of the smoke collection chamber assembly and fixedly connected to the inner wall of the smoke collection chamber assembly, and the lighting panel being disposed through the smoke collection chamber assembly toward the flip plate assembly;

[0024] The connecting flange of the driver bracket is fixedly connected to the back plate, upper side plate and lamp plate bracket of the smoke collection chamber assembly, respectively.

[0025] Compared with existing technologies, the opening and closing mechanism and range hood of this solution have at least the following beneficial effects:

[0026] 1. The opening and closing mechanism of this solution adopts a detachable connection between the adhesive plate and the connecting rod assembly to achieve a detachable connection between the flap assembly and the connecting rod assembly. This allows the flap assembly and the connecting rod assembly to be directly disassembled when it is necessary to clean the internal components of the range hood, such as the air duct, air inlet, and grille, thereby exposing the internal components for cleaning.

[0027] 2. Furthermore, the opening and closing mechanism of this solution adopts a double-arm linkage assembly with bilateral force, which has high rigidity. The movement trajectory will not deviate when the flap assembly is opened or closed, reducing the wear of the linkage assembly and ensuring good stability.

[0028] 3. In this design, the rotating fixed base of the range hood extends into the smoke collection chamber assembly. The rotating part is connected to the rotating shaft assembly and the pivot pin of the flap assembly, which greatly reduces the gap between the upper end of the flap assembly and the smoke collection chamber assembly, thereby preventing the oil fumes from escaping through the gap and improving the user experience. Attached Figure Description

[0029] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this invention.

[0030] Figure 1 This is a schematic diagram of the opening and closing mechanism provided in an embodiment of the present utility model;

[0031] Figure 2 A partial structural schematic diagram of the opening and closing mechanism provided in an embodiment of this utility model from another angle;

[0032] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0033] Figure 4 This is a schematic diagram of the connecting rod assembly provided in a preferred embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of a range hood provided in another embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the working state of a range hood provided in another embodiment of the present invention;

[0036] Figure 7 A side view structural diagram of a range hood provided in another embodiment of the present invention;

[0037] Figure 8 This is a partial structural diagram of a range hood in the open state, provided by another embodiment of the present invention;

[0038] Figure 9 This is a partial structural diagram of a range hood in the open state (with the back panel of the range hood omitted) according to another embodiment of the present invention.

[0039] Reference numerals: 100-Opening and closing mechanism, 10-Transmission assembly, 101-Driver, 102-Driver bracket, 103-Air guide bracket, 104-Connecting flange, 105-Air baffle flange, 20-Link assembly, 201-Connecting part, 202-First link, 203-Second link, 204-First movable pin, 205-Second movable pin, 206-Snap ring, 207-First support arm, 208-Second support arm, 209-Left link 210-Right connecting rod, 30-Flip plate assembly, 301-Adhesive plate, 302-Rotating fixed base, 303-Shaft assembly, 304-Shaft pin, 305-Fixing part, 306-Rotating part, 400-Smoke collection chamber assembly, 500-Air duct box, 401-Air inlet, 402-Grate plate, 403-Smoke collection chamber, 404-Opening angle, 405-Oil collector, 406-Lighting assembly, 407-Lighting panel bracket, 408-Lighting panel. Detailed Implementation

[0040] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand this utility model and implement it. However, the embodiments are not intended to limit this utility model. In this embodiment, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0041] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to and integrated with the other element, or there may be an intervening element present. The terms "mounted," "one end," "the other end," and similar expressions used in this invention are for illustrative purposes only.

[0042] Please refer to Figures 1 to 4 This utility model embodiment provides an opening and closing mechanism 100, including a transmission assembly 10, a connecting rod assembly 20, and a flap assembly 30.

[0043] The first end of the linkage assembly 20 is fixedly connected to the transmission assembly 10, and the second end is movably connected to the flap assembly 30. The transmission assembly 10 can drive the linkage assembly 20 to rotate, thereby driving the flap assembly 30 to open or close. It can be understood that the transmission assembly 10 is used to provide power output for controlling the opening or closing of the flap assembly 30. The transmission assembly 10 can be driven by a motor, such as a geared motor or a servo motor, which can realize automatic opening or closing and also ensure service life. By connecting the output shaft of the transmission assembly 10 to the linkage assembly 20, the transmission assembly 10 can drive the linkage assembly 20 to support the movement of the flap assembly 30.

[0044] An adhesive plate 301 is fixedly connected to the inner side of the flip-plate assembly 30. The adhesive plate 301 is provided with a connecting part 201 extending toward the connecting rod assembly 20. The second end of the connecting rod assembly 20 is detachably connected to the connecting part 201. It can be understood that the inner side of the flip-plate assembly 30 mentioned here refers to the side relative to the operator. The outer side of the flip-plate assembly 30, that is, the side facing the operator, is the panel. Usually, an operation screen or operation panel is set on the panel to control the working status of the range hood. The inner side of the flip-plate assembly 30 is the side away from the operator. The adhesive plate 301 is fixedly connected to the flap assembly 30, which can be fixed by welding or by screw connection; the extension of the connecting part 201 toward the connecting rod assembly 20 means that the connecting part 201 protrudes inward to connect with the connecting rod assembly 20. The detachable connection between the connecting rod assembly 20 and the connecting part 201 allows the flap assembly 30 to be opened freely. When applied to a range hood, the flap assembly 30 can be opened manually to achieve a large opening angle and remain open, making it convenient for the operator to clean or maintain the range hood.

[0045] Please refer to Figures 1 to 4 In this embodiment, the linkage assembly 20 includes a first linkage 202 and a second linkage 203. The first linkage 202 and the second linkage 203 are connected by a second movable pin 205. The first linkage 202 and the second linkage 203 can rotate relative to the second movable pin 205. It can be understood that the first linkage 202 and the second linkage 203 are movably connected by the second movable pin 205. The first linkage 202 and the second linkage 203 rotate relative to each other about the second movable pin 205 as the axis of rotation. Specifically, when the linkage assembly 20 moves forward, the first linkage 202 and the second linkage 203 form a large angle or are in a straight line. When the linkage assembly 20 moves backward, the first linkage 202 and the second linkage 203 form a small angle.

[0046] The first link 202 is fixedly connected to the transmission assembly 10. When the transmission assembly 10 drives the first link 202 to rotate, it can drive the second link 203 to move forward or backward, thereby opening or closing the flap assembly 30. For example, the output shaft of the transmission assembly 10 is fixedly connected to the first link 202. When the output shaft rotates, the first link 202 rotates around the output shaft, that is, the first link 202 swings around the output shaft, which will drive the first link 202 to move forward or backward, thereby opening or closing the flap assembly 30.

[0047] Please refer to Figures 1 to 4 In this embodiment, the second link 203 is connected to the connecting part 201 via the first movable pin 204. The first movable pin 204 passes through the second link 203 and the connecting part 201, allowing the second link 203 to rotate relative to the connecting part 201. It can be understood that when the transmission assembly 10 drives the first link 202 and the second link 203 to move, the second link 203 supports the connecting part 201 and the flap assembly 30. At the same time, the second link 203 and the connecting part 201 can also rotate relative to each other. That is, the included angle between the second link 203 and the connecting part 201 will change with the opening angle of the flap assembly 30. This reduces the travel of the first link 202 and the second link 203 during movement, making the movement trajectory between the link assembly 20 and the flap assembly 30 smoother and more stable.

[0048] A detachable retaining ring 206 is also provided at the end of the first movable pin 204. When the retaining ring 206 is engaged with the first movable pin 204, the first movable pin 204 is relatively fixed to the connecting part 201. For example, both the second connecting rod 203 and the connecting part 201 have openings for the first movable pin 204 to pass through. During installation, the second connecting rod 203 is aligned with the connecting part 201. After the first movable pin 204 passes through the second connecting rod 203 and the connecting part 201, the retaining ring 206 is engaged at the end of the first movable pin 204 to fix the first movable pin 204 so that it cannot fall out of the second connecting rod 203 and the connecting part 201, thereby achieving relative fixation between the first movable pin 204, the second connecting rod 203 and the connecting part 201. At this time, relative rotation between the second connecting rod 203 and the connecting part 201 is still possible. By using a snap ring 206 to fix the first movable pin 204, the first movable pin 204 is detachable, that is, the second connecting rod 203 and the connecting part 201 are detachable, which facilitates the disassembly of the flap assembly 30.

[0049] Please refer to Figures 1 to 4In this embodiment, the first connecting rod 202 is a U-shaped connecting rod with one open end facing the second connecting rod 203. The first connecting rod 202 includes a first support arm 207 and a second support arm 208. The second connecting rod 203 includes a left connecting rod 209 and a right connecting rod 210, which are respectively disposed inside the first support arm 207 and the second support arm 208. The second movable pin 205 passes through the first support arm 207, the left connecting rod 209, the right connecting rod 210, and the second support arm 208 in sequence to movably connect the first connecting rod 202 and the second connecting rod 203. Both the first connecting rod 202 and the second connecting rod 203 adopt a double-sided support structure, which can provide stronger rigidity when the connecting rod assembly 20 supports the movement of the flap assembly 30, ensuring the service life and operational stability of the connecting rod assembly 20.

[0050] Please refer to Figures 1 to 9 This utility model embodiment also provides a range hood, which includes a duct box 500, a smoke collection chamber assembly 400, and an opening and closing mechanism 100 as described above. The duct box 500, the smoke collection chamber assembly 400, and the opening and closing mechanism 100 are sequentially fixedly connected. It can be understood that the duct box 500 is located above the smoke collection chamber assembly 400, and the opening and closing mechanism 100 is located on the lower side of the smoke collection chamber assembly 400. When the range hood is started, the flap assembly 30 opens, and the smoke collection chamber assembly 400 draws in the fumes and discharges them from the duct box 500.

[0051] The flap assembly 30 also includes a rotating fixed base 302, a rotating shaft assembly 303, and shaft pins 304. The rotating shaft assembly 303 is fixedly connected to the upper part of the flap assembly 30, and the shaft pins 304 are respectively disposed at both ends of the rotating shaft assembly 303. It can be understood that the upper part mentioned here refers to the side of the flap assembly 30 close to the smoke collection chamber assembly 400.

[0052] The rotating fixed base 302 includes a fixed part 305 and a rotating part 306. A pin 304 is movably connected to the rotating part 306. The fixed part 305 extends into the smoke collection chamber assembly 400 and is fixedly connected to the smoke collection chamber assembly 400. The flap assembly 30 can rotate around the pin 304. It can be understood that after the fixed part 305 extends into the smoke collection chamber assembly 400, at least part of the rotating part 306 extends out of the smoke collection chamber assembly 400. The flap assembly 30 is connected to the rotating part 306 through a rotating shaft assembly 303 and a pin 304. This design can reduce the gap between the flap assembly 30 and the smoke collection chamber assembly 400, preventing oil fumes from escaping through the gap and affecting the oil fume extraction effect.

[0053] Please refer to Figures 1 to 9In this embodiment, the smoke collection chamber assembly 400 is provided with an air inlet 401 and a grille plate 402 on the side facing the flap assembly 30. The first end of the transmission assembly 10 and the connecting rod assembly 20 are disposed in the smoke collection chamber assembly 400, and the second end of the connecting rod assembly 20 passes through the grille plate 402 and is connected to the flap assembly 30. It can be understood that the air inlet 401 is connected to the air duct box 500. A fan is also provided in the smoke collection chamber assembly 400 to generate suction airflow. When the fan is started, the oil fumes are drawn into the smoke collection chamber assembly 400 from the grille plate 402 and the air inlet 401 and discharged from the air duct box 500. An opening is provided on the grille plate 402 for the connecting rod assembly 20 to pass through, and the second end of the connecting rod assembly 20 extends out from the opening and is connected to the flap assembly 30.

[0054] When the flap assembly 30 is closed, it covers the air inlet 401 and the grille 402. When the flap assembly 30 is open, a smoke collection chamber 403 is formed between the flap assembly 30 and the air inlet 401. The oil fumes are collected between the flap assembly and the air inlet 401, which facilitates the fan to suck and exhaust the oil fumes, thereby improving the efficiency of oil fume extraction.

[0055] Please refer to Figures 1 to 9 In this embodiment, the included angle formed by the flap assembly 30 and the grille plate 402 is the opening angle 404 of the flap assembly 30, as shown by ∠α in the figure. The maximum angle of the opening angle 404 is 90°-110°, and can be 90°, 100°, 110°, etc. If the opening angle 404 of the flap assembly 30 is too small, the smoke collection area will be insufficient; if the opening angle 404 is too large, the smoke guiding effect will be poor. In this embodiment, thanks to the connection structure between the flap assembly 30 and the smoke collection chamber assembly 400, the flap assembly 30 has a larger opening angle 404 degrees compared to current range hoods, while ensuring the smoke collection effect. This allows for a reduction in the area of ​​the flap assembly 30, specifically the width of the flap assembly 30. As a result, when the flap assembly 30 is opened, it will not interfere with the cookware or obstruct the user's view, thus improving the user experience.

[0056] Please refer to Figures 1 to 9 In this embodiment, an oil collector 405 is also provided at the lower part of the smoke collection chamber assembly 400. When the flap assembly 30 is opened and reaches the maximum opening angle 404, the height of the lowest point of the flap assembly 30 is higher than the height of the oil collector 405. As mentioned above, the design of this solution can reduce the area of ​​the flap assembly 30, so that when it is opened, its lowest point is also higher than the height of the oil collector 405, thus not obstructing the user's view and improving the user experience.

[0057] Please refer to Figures 1 to 9In this embodiment, the transmission assembly 10 includes a driver 101, a driver bracket 102, and an air guide bracket 103, wherein the driver bracket 102 is fixedly connected to the driver 101.

[0058] The driver bracket 102 is provided with a connecting flange 104, and the driver bracket 102 is fixedly connected to the inner wall of the smoke collection chamber assembly 400 through the connecting flange 104; for example, the driver 101 adopts a motor or other components, and the driver bracket 102 can be fixedly connected to the smoke collection chamber assembly 400 by welding or screws or other means.

[0059] The air guide bracket 103 is located on the side of the driver 101 facing the air inlet 401. The air guide bracket 103 is fixedly connected to the driver bracket 102. The air guide bracket 103 is provided with a windproof flange 105 facing the driver 101. It can be understood that the air guide bracket 103 and its windproof flange 105 can block the oil fumes entering from the air inlet 401, and prevent the oil fumes from adhering to the driver 101 and affecting the service life of the driver 101.

[0060] Furthermore, the smoke collection chamber assembly 400 is also provided with a lighting assembly 406, which includes a light panel bracket 407 and a light panel 408. The light panel bracket 407 is disposed in the inner cavity of the smoke collection chamber assembly 400 and is fixedly connected to the inner wall of the smoke collection chamber assembly 400. The light panel 408 is disposed through the smoke collection chamber assembly 400 and facing the flip panel assembly 30. When the flip panel assembly 30 is opened, the lighting assembly 406 is opened in conjunction to illuminate the space below the smoke collection chamber assembly 400, thereby improving the user experience.

[0061] The connecting flange 104 of the driver bracket 102 is fixedly connected to the back plate, upper side plate and lamp plate bracket 407 of the smoke collection chamber assembly 400 respectively. With this design, the driver bracket 102 adopts a three-point fixing method, which improves the connection strength between the driver bracket 102 and the driver 101. When the driver 101 is working, it reduces the shaking that may occur due to the operation of the driver 101, and achieves stable driving conditions.

[0062] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An opening and closing mechanism, characterized in that, Includes transmission components, linkage components, and flap components; The first end of the linkage assembly is fixedly connected to the transmission assembly, and the second end is movably connected to the flap assembly. The transmission assembly can drive the linkage assembly to rotate so as to drive the flap assembly to open or close. An adhesive plate is fixedly connected to the inner side of the flap assembly. The adhesive plate is provided with a connecting part extending toward the connecting rod assembly. The second end of the connecting rod assembly is detachably connected to the connecting part.

2. The opening and closing mechanism as described in claim 1, characterized in that, The linkage assembly includes a first linkage and a second linkage, which are connected by a second movable pin and are rotatable relative to the second movable pin. The first link is fixedly connected to the transmission assembly. When the transmission assembly drives the first link to rotate, it can drive the second link to move forward or backward, thereby driving the flap assembly to open or close.

3. The opening and closing mechanism as described in claim 2, characterized in that, The second link is connected to the connecting part by a first movable pin, the first movable pin passing through the second link and the connecting part, and the second link can rotate relative to the connecting part; A detachable retaining ring is also provided at the end of the first movable pin. When the retaining ring is engaged with the first movable pin, the first movable pin is fixed relative to the connecting part.

4. The opening and closing mechanism as described in claim 2, characterized in that, The first connecting rod is a U-shaped connecting rod with one open end facing the second connecting rod. The first connecting rod includes a first arm and a second arm. The second connecting rod includes a left connecting rod and a right connecting rod. The left connecting rod and the right connecting rod are respectively disposed on the inner side of the first arm and the second arm. The second movable pin passes through the first arm, the left connecting rod, the right connecting rod and the second arm in sequence to movably connect the first connecting rod and the second connecting rod.

5. A range hood, characterized in that, It includes a duct housing, a smoke collection chamber assembly, and an opening and closing mechanism as described in any one of claims 1-4, wherein the duct housing, the smoke collection chamber assembly, and the opening and closing mechanism are fixedly connected in sequence; The flip-plate assembly also includes a rotating fixed base, a rotating shaft assembly, and shaft pins. The rotating shaft assembly is fixedly connected to the upper part of the flip-plate assembly, and the shaft pins are respectively disposed at both ends of the rotating shaft assembly. The rotating fixed base includes a fixed part and a rotating part. The shaft pin is movably connected to the rotating part. The fixed part extends into the smoke collection chamber assembly and is fixedly connected to the smoke collection chamber assembly. The flap assembly can rotate around the shaft pin.

6. The range hood as described in claim 5, characterized in that, The smoke collection chamber assembly has an air inlet and a grille on the side facing the flap assembly. The first end of the transmission assembly and the first end of the connecting rod assembly are disposed in the smoke collection chamber assembly, and the second end of the connecting rod assembly passes through the grille and is connected to the flap assembly. When the flap assembly is closed, the flap assembly covers the air inlet and the grille plate; When the flap assembly is opened, a smoke collection chamber is formed between the flap assembly and the air inlet.

7. The range hood as described in claim 6, characterized in that, The angle formed between the flap assembly and the grid plate is the opening angle of the flap assembly, and the maximum opening angle is 90°-110°.

8. The range hood as described in claim 5, characterized in that, The lower part of the smoke collection chamber assembly is also provided with an oil collector. When the flap assembly is opened and reaches its maximum opening angle, the height of the lowest point of the lower end of the flap assembly is higher than the height of the oil collector.

9. The range hood as described in claim 6, characterized in that, The transmission assembly includes a driver, a driver bracket, and an air guide bracket, wherein the driver bracket is fixedly connected to the driver. The driver bracket is provided with a connecting flange, and the driver bracket is fixedly connected to the inner wall of the smoke collection chamber assembly through the connecting flange; The air guide bracket is disposed on the side of the driver facing the air inlet. The air guide bracket is fixedly connected to the driver bracket. The air guide bracket is provided with a windproof flange facing the driver.

10. The range hood as described in claim 9, characterized in that, The smoke collection chamber assembly is also provided with a lighting assembly, which includes a lamp plate bracket and a lighting panel. The lamp plate bracket is disposed in the inner cavity of the smoke collection chamber assembly and is fixedly connected to the inner wall of the smoke collection chamber assembly. The lighting panel passes through the smoke collection chamber assembly and is disposed towards the flip plate assembly. The connecting flange of the driver bracket is fixedly connected to the back plate, upper side plate and lamp plate bracket of the smoke collection chamber assembly, respectively.

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