Cooking fume absorbing device

Abstract

The application discloses an oil fume suction equipment and belongs to the technical field of kitchen appliances. The oil fume suction equipment is designed to solve the problem that the connecting rod of the existing oil fume suction equipment is prone to colliding with surrounding structures. The oil fume suction equipment comprises a connecting rod, a fume collecting hood and a flap assembly. One end of the connecting rod is connected to the flap assembly, and the other end of the connecting rod is movably connected to the inner wall surface of the fume collecting hood. An installation through hole for penetrating the connecting rod is formed in the fume collecting hood. When the flap assembly is in an open state, a closed state and switches between the open state and the closed state, the distance between the connecting rod and the edge of the installation through hole and the top surface of the fume collecting hood during movement is always greater than a set value. The oil fume suction equipment disclosed by the application always leaves a gap between the connecting rod and the edge of the installation through hole and the top surface of the fume collecting hood during movement, and the flap assembly is more smooth to open and close, the inner top surface of the fume collecting hood and the installation through hole are prevented from being extruded and deformed by the connecting rod, the use experience is better, and the miniaturization of the overall structure is facilitated.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, and more particularly to fume extraction equipment. Background Technology

[0002] A range hood is a common household appliance that uses a fan to create negative pressure inside its casing. Cooking fumes are drawn into the casing through a smoke collection chamber under this negative pressure and are then either discharged outdoors or centrally filtered. To combine aesthetics and practicality, a flap is usually installed on the casing. When fume extraction is needed, the flap opens, increasing the smoke collection area for more thorough extraction; after extraction, the flap closes, completely concealing the smoke collection chamber and enhancing the overall appearance of the range hood.

[0003] To open and close the flap, it is typically hinged to the housing using a connecting rod. The flap rotates synchronously around the hinge point with the connecting rod, switching between the open and closed states. Currently, one end of the connecting rod is attached to the back of the flap, and the other end is hinged to the inner wall of the housing. When the flap is closed, it completely conceals the connecting rod, resulting in a more aesthetically pleasing appearance for the fume extraction equipment.

[0004] As existing range hoods become smaller, the space left for the connecting rod to move is also reduced, making it easier for the connecting rod to collide with surrounding structures. To avoid collisions between the connecting rod and surrounding structures when the switch is flipped, the size of the range hood needs to be increased, which will take up more kitchen space and result in poor product competitiveness. Summary of the Invention

[0005] The purpose of this invention is to propose a fume extraction device that solves the problem that the connecting rod of existing fume extraction devices is prone to collision with the surrounding structure, which is conducive to the miniaturization of the overall structure.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A fume extraction device includes a connecting rod, a fume hood, and a flap assembly. One end of the connecting rod is connected to the flap assembly, and the other end of the connecting rod is movably connected to the inner wall of the fume hood. The fume hood has a mounting through hole for the connecting rod to pass through. When the flap assembly is in an open state, a closed state, or switching between the open and closed states, the distance between the connecting rod and the edge of the mounting through hole and the top surface of the fume hood is always greater than a set value during the movement.

[0008] In one preferred embodiment, the connecting rod includes a concave curve, an end curve, and a convex curve connected in sequence. The concave curve and / or the convex curve are each formed by connecting at least two curves with different radii, and there is a smooth transition between adjacent curves. During the movement of the connecting rod, the distance between the concave curve and the edge of the mounting through hole is always greater than a set value, and the distance between the convex curve and the edge of the mounting through hole and the top surface of the smoke hood is always greater than a set value.

[0009] In one preferred embodiment, the concave curve includes a transition concave sub-curve N1, a cover-end connecting concave sub-curve, an avoidance concave sub-curve N4, and a plate-end connecting concave sub-curve connected sequentially from the end curve end. The radius RN4 of the avoidance concave sub-curve N4 is smaller than the radius of all the other concave sub-curves.

[0010] In one preferred embodiment, the plate end connecting sub-curve further includes a fifth concave sub-curve N5, a sixth concave sub-curve N6, and a seventh concave sub-curve N7 connected sequentially from the end of the avoidance concave sub-curve N4 in a direction away from the end curve, wherein the radii of the fifth concave sub-curve N5, the sixth concave sub-curve N6, and the seventh concave sub-curve N7 gradually increase.

[0011] In one preferred embodiment, the line connecting the center of the transition concave sub-curve N1 and the center O of the end curve forms a straight line Q, and the distance between the transition concave sub-curve N1 and the straight line Q is H, where 5mm≤H≤8mm.

[0012] In one preferred embodiment, the distance between the avoidance concave sub-curve N4 and the nearest limiting point is X, where 4mm ≤ X ≤ 6mm.

[0013] In one preferred embodiment, the convex curve includes a transition convex sub-curve W1, a cover-end connecting convex sub-curve, an avoidance convex sub-curve W4, and a plate-end connecting convex sub-curve connected sequentially from the end curve. The radius RW4 of the avoidance convex sub-curve W4 is greater than the radius of all the other convex sub-curves.

[0014] In one preferred embodiment, the outer convex curve connecting the cover end includes an outer convex curve reinforcement segment W3 that is connected to the end of the avoidance outer convex curve W4 and extends toward the end curve direction. The distance between the outer convex curve reinforcement segment W3 and the nearest limiting point is Z, 3mm≤Z≤5mm.

[0015] In one preferred embodiment, the distance between the concave curve and the convex curve is Y, where 10mm ≤ Y ≤ 15mm.

[0016] In one preferred embodiment, the fume extraction device further includes a cover plate connected to the connecting rod. When the flap assembly is in the open state, the cover plate blocks the mounting through hole. When the flap assembly is in the closed state, the distance between the cover plate and the top surface of the fume hood is greater than a set value.

[0017] In one preferred embodiment, the cover plate includes a cover plate body, which is movably connected to the connecting rod; when the flap assembly is in the closed state, the cover plate body can abut against the top surface of the smoke hood and rotate in the opposite direction, so that the minimum distance between the cover plate body and the top surface of the smoke hood is greater than a set value; or, the cover plate includes a cover plate body, which is fixedly connected to the connecting rod; when the flap assembly is in the closed state, the minimum distance between the cover plate body and the top surface of the smoke hood is greater than a set value.

[0018] In one preferred embodiment, when the cover plate body is hinged to the connecting rod, two suspension arms are arranged opposite to each other on the cover plate body, and the suspension arms are provided with suspension through holes. At least one second suspension member is provided on the connecting rod, and one of the suspension through holes is sleeved on the second suspension member.

[0019] In one preferred embodiment, a first limiting member is provided on the cover plate body, and a second limiting member is provided on the connecting rod. The first limiting member is located between the second limiting member and the mounting through hole. When the flap assembly is opened, the second limiting member abuts against the first limiting member, so that the cover plate presses against the mounting through hole.

[0020] In one preferred embodiment, the fume extraction device further includes a cover plate connected to the connecting rod and made of a flexible material with elastic deformation capability. When the flap assembly is in the open state, the cover plate covers the mounting through hole; when the flap assembly is in the closed state, the cover plate undergoes elastic deformation to prevent the cover plate from pressing against the top surface of the fume hood and causing the fume hood to deform.

[0021] The fume extraction device disclosed in this invention, when the flap assembly is in the open state, closed state, and switching between the open and closed states, leaves a gap between the connecting rod and the edge of the mounting through hole and the top surface of the fume hood during the movement of the connecting rod. This makes the flap assembly open and close more smoothly, avoids the top surface inside the fume hood and the mounting through hole being squeezed and deformed by the connecting rod, extends the service life of the fume hood, improves the user experience, and is conducive to the miniaturization of the overall structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the fume extraction device provided in a specific embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of the fume extraction device when the flap assembly provided in a specific embodiment of the present invention is opened;

[0024] Figure 3 This is a cross-sectional view of the fume extraction device when the flap assembly is closed, according to a specific embodiment of the present invention.

[0025] Figure 4 This is one of the schematic diagrams of the combined structure of the flap assembly, connecting rod and driving device provided in a specific embodiment of the present invention;

[0026] Figure 5 This is a second schematic diagram of the combined structure of the flap assembly, connecting rod, and driving device provided in a specific embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the combined structure of the flap assembly, connecting rod, driving device, smoke hood, cover plate and wiring section provided in a specific embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the combined structure of the flap assembly, connecting rod, cover plate and wiring section provided in a specific embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the combined structure of the connecting rod and hinge assembly provided in a specific embodiment of the present invention;

[0030] Figure 9 This is a top view of the combined structure of the connecting rod and hinge assembly provided in a specific embodiment of the present invention;

[0031] Figure 10 This is a front view of the combined structure of the connecting rod and hinge assembly provided in a specific embodiment of the present invention;

[0032] Figure 11 This is a side view of the combined structure of the connecting rod and hinge assembly provided in a specific embodiment of the present invention;

[0033] Figure 12 This is a schematic diagram of the pin structure provided in a specific embodiment of the present invention;

[0034] Figure 13 This is a schematic diagram showing the position of the connecting rod when the flap assembly is opened according to a specific embodiment of the present invention;

[0035] Figure 14 This is a schematic diagram showing the relative positional relationship between the connecting rod and the front limit point when the flap assembly is opened according to a specific embodiment of the present invention;

[0036] Figure 15 This is a schematic diagram showing the relative positional relationship between the connecting rod and the front and rear limit points when the flap assembly is half-open and half-closed according to a specific embodiment of the present invention.

[0037] Figure 16 This is a schematic diagram showing the relative positional relationship between the connecting rod and the top limit point when the flap assembly is closed, according to a specific embodiment of the present invention.

[0038] Figure 17 This is one of the structural schematic diagrams of the connecting rod provided in a specific embodiment of the present invention;

[0039] Figure 18 This is the second schematic diagram of the connecting rod provided in a specific embodiment of the present invention;

[0040] Figure 19 This is the third structural schematic diagram of the connecting rod provided in a specific embodiment of the present invention;

[0041] Figure 20 This is the fourth structural schematic diagram of the connecting rod provided in a specific embodiment of the present invention;

[0042] Figure 21 This is a schematic diagram of the mounting through hole provided in a specific embodiment of the present invention;

[0043] Figure 22 This is a schematic diagram of the oil fume extraction device structure when the cover plate blocks the installation through hole according to a specific embodiment of the present invention;

[0044] Figure 23 yes Figure 22 A magnified view of a section at point A in the middle;

[0045] Figure 24 This is a partial cross-sectional view of the fume extraction device with the flap assembly open according to a specific embodiment of the present invention;

[0046] Figure 25 yes Figure 24 A magnified view of a section at point B in the middle;

[0047] Figure 26 This is a partial enlarged view of the fume extraction device with the flap assembly partially open and partially closed according to a specific embodiment of the present invention;

[0048] Figure 27 This is a partial enlarged view of the fume extraction device when the flap assembly is closed, according to a specific embodiment of the present invention;

[0049] Figure 28 This is a schematic diagram of the cover plate provided in a specific embodiment of the present invention;

[0050] Figure 29 This is one of the schematic diagrams of the combined structure of the flap assembly, wiring section and connecting rod provided in a specific embodiment of the present invention;

[0051] Figure 30This is a schematic diagram of the combined structure of the wiring section and the cover plate provided in a specific embodiment of the present invention;

[0052] Figure 31 This is a second schematic diagram of the combined structure of the flap assembly, wiring section and connecting rod provided in a specific embodiment of the present invention;

[0053] Figure 32 hour Figure 31 Enlarged view of a section at point C;

[0054] Figure 33 This is one of the exploded views of the connecting rod, wiring section, and mounting section provided in a specific embodiment of the present invention;

[0055] Figure 34 This is the second exploded view of the connecting rod, wiring section, and mounting section provided in a specific embodiment of the present invention.

[0056] In the picture:

[0057] 1. Concave curve; 2. Convex curve; 3. End curve; 4. Connecting rod fixing seat; 100. Connecting rod; 101. Fixed end; 102. Connecting rod hinge through hole; 103. Second suspension component; 200. Housing; 300. Smoke hood; 301. Mounting through hole; 302. Top limit point; 303. Rear limit point; 304. Front limit point; 305. Flanged edge; 400. Flip plate assembly; 500. Cover 501. Cover plate body; 502. Suspension arm; 503. Suspension through hole; 504. First limiting member; 601. Wiring part; 602. Mounting part; 603. Wiring port; 604. Buckle; 605. First suspension member; 606. Second limiting member; 700. Wiring; 800. Drive device; 900. Hinge assembly; 901. Hinge seat; 902. Pin; 903. Anti-detachment zone. Detailed Implementation

[0058] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0059] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0062] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature 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] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0064] This embodiment discloses a fume extraction device whose connecting rod can stably support the flap, making the fume collection range more stable and the fume extraction effect better. This fume extraction device can be, but is not limited to, a top-mounted range hood, a side-mounted range hood, or a range hood in an integrated stove, or any other device with fume collection and processing functions.

[0065] like Figures 1 to 7 As shown, the fume extraction device includes a connecting rod 100, a housing 200, a fume hood 300, a flap assembly 400, and a drive device 800. One end (fixed end 101) of the connecting rod 100 is connected to the flap assembly 400, and the other end (hinged end) of the connecting rod 100 is movably connected to the inner wall of the fume hood 300 via a hinge assembly 900. The fume hood 300 has a mounting through hole 301 for the connecting rod 100 to pass through (e.g., ...). Figure 21 As shown, the connecting rod 100 connects the flap assembly 400 to the fume hood 300. To prevent oil from flowing out of the fume hood 300 through the mounting hole 301, the edge of the mounting hole 301 is bent inward toward the fume hood 300 to form a flange 305. When oil flows to the vicinity of the mounting hole 301, it is blocked by the flange 305 and its flow direction is changed, preventing it from seeping out from the mounting hole 301. The other structures of the fume extraction device are the same as those in the prior art and will not be described in detail here.

[0066] When the flap assembly 400 is in the open, closed, or switching between the open and closed states, the distance between the connecting rod 100 and the edge of the mounting through hole 301 and the top surface of the smoke hood 300 during movement is always greater than a set value. This prevents the smoke hood 300 from being deformed by the connecting rod 100, extending the service life of both the connecting rod 100 and the smoke hood 300. The flap assembly 400 also operates more smoothly, providing a better user experience. It is understood that the specific value of this "set value" is not limited and can be set according to factors such as the hardness of the smoke hood 300, its shape and structure, and the machining precision of the connecting rod 100 and the smoke hood 300, as long as it ensures that the smoke hood 300 is not deformed by the connecting rod 100. For example, set values ​​of 0.05mm, 0.1mm, 0.2mm, 0.5mm, 1mm, and 2mm are acceptable; values ​​less than 0.05mm and greater than 2mm are also feasible.

[0067] The drive unit 800 can be, but is not limited to, a hydraulic push rod, which can drive the flap assembly 400 to open and close the smoke collection port on the smoke collection hood 300. When the flap assembly 400 is open, it can collect smoke and remove oil fumes more thoroughly; when the flap assembly 400 is closed, it saves space and makes the whole machine more aesthetically pleasing.

[0068] The specific connection structure of the flap assembly 400 is not limited, as long as the connection with the smoke collection hood 300 is stable and does not affect the opening and closing of the smoke collection port. In this embodiment, the flap assembly 400 is fixedly connected to the connecting rod 100, and the flap assembly 400 is hinged to the drive device 800. By disassembling the connecting parts between the flap assembly 400 and the connecting rod 100, and disassembling the connecting parts between the flap assembly 400 and the drive device 800, the flap assembly 400 can be removed. Maintenance can be performed without moving the entire fume extraction equipment, making it more convenient to use.

[0069] The installation method of the drive device 800 is not limited, as long as it can drive the flap assembly 400 to open and close the smoke collection port. In this embodiment, one end of the drive device 800 is connected to the flap assembly 400, and the other end is connected to the smoke collection hood 300. The drive device 800 can be removed by disconnecting the connectors at both ends, which facilitates maintenance and replacement.

[0070] The statement "The distance between the connecting rod 100 and the edge of the mounting through hole 301 and the top surface of the smoke hood 300 is always greater than the set value during the movement" has two main meanings. First, the distance between the connecting rod 100 itself and the edge of the mounting through hole 301 and the top surface of the smoke hood 300 is always greater than the set value. Second, the distance between the object connected to the connecting rod 100 and the edge of the mounting through hole 301 and the top surface of the smoke hood 300 is always greater than the set value. These two situations will be explained separately below.

[0071] like Figures 8 to 11 As shown, the connecting rod 100 includes a concave curve 1, a convex curve 2, and an end curve 3. The end curve 3 connects the concave curve 1 and the convex curve 2. The free ends of the concave curve 1 and the convex curve 2 are respectively connected to the connecting rod fixing seat 4. The concave curve 1, the convex curve 2, and the end curve 3 form a C-shaped structure so that the connecting rod 100 avoids surrounding objects when it moves. That is, the distance between the connecting rod 100 itself and the edge of the mounting through hole 301 and the top surface of the smoke hood 300 is greater than a set value.

[0072] In the fume extraction equipment, the "surrounding objects" mainly include the top limit point 302 located on the top surface inside the fume hood 300, the rear limit point 303 located on the mounting through hole 301 and behind the connecting rod 100, and the front limit point 304 located on the mounting through hole 301 and in front of the connecting rod 100. During the opening and closing of the flap assembly 400, the connecting rod 100 is most likely to collide with the above three limit points.

[0073] The hinge assembly 900 includes a hinge seat 901 and a pin 902. The connecting rod 100 has a connecting rod hinge through hole 102 for the pin 902 to pass through (e.g., Figure 20 (As shown). After the pin 902 is inserted into the connecting rod hinge through hole 102, the pin 902 is riveted to the hinge seat 901. The connecting rod 100 can swing around the pin 902, or the connecting rod 100 and the pin 902 can swing together around the axis of the pin 902.

[0074] The center of pin 902 is knurled to form an anti-detachment zone 903 (e.g., Figure 12 As shown), the outer peripheral surface of the anti-detachment zone 903 is connected to the connecting rod hinge through hole 102 (as shown). Figure 20 The friction between the walls (as shown) is relatively large, which can prevent the pin 902 and the connecting rod 100 from separating, making the overall connection structure more stable.

[0075] During the rotation of the C-shaped connecting rod 100 around the axis of the pin 902, it can avoid hitting the top limit point 302, the rear limit point 303, and the front limit point 304. The rotation of the connecting rod 100 is smoother and more stable, preventing the top surface of the smoke hood 300 and the edge of the mounting through hole 301 from being deformed by pressure, thus improving the stability of the flap assembly 400. The C-shaped structure increases the strength of the connecting rod 100, providing support for the heavier flap assembly 400 and making it more widely applicable.

[0076] Based on the above structure, the concave curve 1 and / or the convex curve 2 are each formed by connecting at least two curves with different radii, and the transition between adjacent curves is smooth. The concave curve 1 and the convex curve 2 bend in the same direction, forming an approximate C-shaped structure. The radius and center point of each curve segment can be specifically designed according to the shape of the internal space of the range hood, so as to make full use of the internal space of the range hood to allow the connecting rod 100 to move, which is conducive to the miniaturization of the range hood and reduces the space occupied in the kitchen.

[0077] Specifically, during the movement of the connecting rod 100, the concave curve 1 does not make hard contact with the edge of the mounting through hole 301 (mainly the front limit point 304), and the convex curve 2 does not make hard contact with the edge of the mounting through hole 301 (mainly the rear limit point 303) and the top limit point 302 on the top surface of the smoke hood 300.

[0078] While avoiding the internal components of the fume extraction equipment, the distance between the concave curve 1 and the convex curve 2 can be appropriately increased to increase the strength of the connecting rod 100, prevent the connecting rod 100 from deforming or even being damaged under the gravity of the flap assembly 400, extend the service life of the whole machine, and enable the fume extraction equipment to operate stably for a long time.

[0079] like Figures 13 to 17As shown, the concave curve 1 includes a transition concave sub-curve N1 connected sequentially from the end curve 3, a cover-end connecting concave sub-curve, a clearance concave sub-curve N4, and a plate-end connecting concave sub-curve. The radius RN4 of the clearance concave sub-curve N4 is smaller than the radii of all the other concave sub-curves. The clearance concave sub-curve N4 is located approximately in the middle of the concave curve 1. When the connecting rod 100 rotates, as long as the distance between the clearance concave sub-curve N4 and the front limit point 304 is always greater than a set value, the distance between other positions on the concave curve 1 and the front limit point 304 will always be greater than the set value, ensuring that the connecting rod 100 moves more smoothly and the smoke hood 300 is not squeezed and deformed by the connecting rod 100, thus meeting the requirements of complex motion trajectories.

[0080] In this embodiment, the concave curve 1 is composed of seven curve segments connected in sequence. The transition concave sub-curve N1 is the first segment, the avoidance concave sub-curve N4 is the fourth segment, and the cover-end connecting concave sub-curve includes the second concave sub-curve N2 and the third concave sub-curve N3. By setting two curve segments with different radii, the transition between the transition concave sub-curve N1 and the avoidance concave sub-curve N4 is made smoother, which plays a corrective role for the concave curve 1, and can avoid impacting the front limit point 304 while having good strength.

[0081] The exact values ​​of the center position and radius of all seven curves are not limited. They can be designed according to the shape and size of the smoke collection hood 300 of the fume extraction equipment and the shape and size of the mounting through hole 301, as long as the connecting rod 100 does not collide when it swings.

[0082] like Figure 14 As shown, the distance between the avoidance concave curve N4 and the front limit point 304 is X, where 4mm ≤ X ≤ 6mm. In this embodiment, X is 4mm, 4.5mm, 5mm, 5.5mm, and 6mm. This provides sufficient space for poor machining accuracy and deformation of parts, thereby improving the yield rate.

[0083] The radius of the transition concave curve N1 is significantly larger than that of the avoidance concave curve N4, which can prevent the processing stress from concentrating at the transition concave curve N1 and improve the overall strength of the connecting rod 100. The transition concave curve N1 is close to the end curve 3 and is closer to the swing center O of the connecting rod 100, so there is no chance of hitting the front limit point 304. It is more suitable to widen the connecting rod 100 at this point to improve the strength of the connecting rod 100.

[0084] Based on the above structure, the plate end connecting sub-curve also includes a fifth concave sub-curve N5, a sixth concave sub-curve N6, and a seventh concave sub-curve N7, which are connected sequentially from the end of the avoidance concave sub-curve N4 in a direction away from the end curve 3. The radii of the avoidance concave sub-curve N4, the fifth concave sub-curve N5, the sixth concave sub-curve N6, and the seventh concave sub-curve N7 gradually increase, and the curve formed by the four curve segments is approximately involute-shaped.

[0085] The fifth concave sub-curve N5, the sixth concave sub-curve N6, and the seventh concave sub-curve N7 are far from the swing center O of the connecting rod 100. During the swing of the connecting rod 100, the fifth concave sub-curve N5, the sixth concave sub-curve N6, and the seventh concave sub-curve N7 are always relatively far from the front limit point 304 and will not collide. Therefore, when designing the center and radius of the fifth concave sub-curve N5, the sixth concave sub-curve N6, and the seventh concave sub-curve N7, more consideration is given to the strength of the connecting rod 100 and the difficulty of processing, to ensure that each curve segment that makes up the concave curve 1 is smoothly connected.

[0086] like Figure 18 As shown, the line connecting the center of the transition concave sub-curve N1 and the center O of the end curve 3 forms a straight line Q. The distance between the transition concave sub-curve N1 and the straight line Q is H, where 5mm ≤ H ≤ 8mm. In this embodiment, H is 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, and 8mm. The transition concave sub-curve N1 can work more smoothly with other component curve segments within the concave curve 1, and it has good stability and reliability.

[0087] The concave curve 1 design ensures that the connecting rod 100 can navigate through the complex spatial environment inside the smoke hood 300, cleverly avoiding various parts inside the smoke hood 300, preventing the connecting rod 100 from making hard contact with surrounding objects, and preventing the smoke hood 300 from being squeezed and deformed, making it safer to use; there is no need to leave a large space for the connecting rod 100 inside the smoke hood 300, which improves the compactness and rationality of the internal structure of the smoke hood 300.

[0088] Based on the above structure, such as Figure 19 As shown, the convex curve 2 includes a transition convex sub-curve W1, a cover-end connecting convex sub-curve, a clearance convex sub-curve W4, and a plate-end connecting convex sub-curve, which are connected sequentially from the end curve 3. The radius RW4 of the clearance convex sub-curve W4 is larger than the radii of all the other convex sub-curves. The clearance convex sub-curve W4 is located approximately at the middle of the convex curve 2, near the end of the flap assembly 400. As long as the clearance convex sub-curve W4 does not collide with the top limit point 302 and the rear limit point 303, the other curve segments on the convex curve 2 will not collide with the top limit point 302 and the rear limit point 303.

[0089] In this embodiment, the convex curve 2 includes six sequentially connected curve segments with different radii and centers. Specifically, the transition convex sub-curve W1 smoothly connects with the end curve 3, and together with the end curve 3, shapes the outer contour of the connecting rod 100; the cover-end connecting convex sub-curve includes a second convex sub-curve W2 and a reinforcing convex sub-curve W3 connected in sequence. The second convex sub-curve W2 connects with the transition convex curve W1, making the shape of the connecting rod 100 more in line with motion requirements. The reinforcing convex sub-curve W3 connects between the second convex sub-curve W2 and the avoidance convex sub-curve W4, playing a connecting role; the radius RW4 of the avoidance convex sub-curve W4 can be as large as possible to better avoid the top limit point 302 and the rear limit point 303, avoiding impact; the fifth convex curve W5 and the sixth convex curve W6 are connected in sequence, perfecting the outer contour of the connecting rod 100, enabling the connecting rod 100 to meet the requirements of complex motion trajectories. It is understandable that, for ease of processing, the curve W4 that avoids the external convex sub-curve can be designed as a straight line segment, which can be understood as a curve with a radius of ∞.

[0090] The specific values ​​of the center position and radius of all six curves are not limited. They can be designed according to the shape and size of the smoke collection hood 300 of the fume extraction equipment and the shape and size of the mounting through hole 301, as long as the connecting rod 100 does not collide when it swings.

[0091] like Figure 16 As shown, when the flap assembly 400 completely closes the smoke collection port on the smoke collection hood 300, the distance between the reinforced section W3 of the outward convex curve and the nearest limiting point is Z, where 3mm ≤ Z ≤ 5mm. In this embodiment, Z is 3mm, 3.5mm, 4mm, 4.5mm, and 5mm. Sufficient space is provided to accommodate poor machining accuracy and deformation of the device after a period of use, thus extending the service life of the connecting rod 100.

[0092] like Figure 20 As shown, the distance between the concave curve 1 and the convex curve 2 is Y, where 10mm ≤ Y ≤ 15mm. In this embodiment, Y is 10mm, 11mm, 12mm, 13mm, 14mm, and 15mm to ensure that the connecting rod 100 does not collide with surrounding objects during movement, while also possessing good strength to prevent deformation or even damage to the connecting rod 100.

[0093] To facilitate the installation of connecting rod 100, such as Figure 21 As shown, the smoke hood 300 has a mounting through hole 301 for the connecting rod 100 to pass through. When the flap assembly 400 is opened, a person's finger can easily be inserted into the mounting through hole 301, which may cause the finger to be pinched and cause injury, posing a safety hazard.

[0094] To solve this problem, such as Figures 21 to 27As shown, the fume extraction device also includes a cover plate 500, which is directly or indirectly connected to the connecting rod 100. In this embodiment, the distance between the cover plate 500 and the edge of the mounting through hole 301 and the top surface of the fume hood 300 is required to be greater than a set value. Specifically, the cover plate 500 can move synchronously with the connecting rod 100. When the flap assembly 400 is open, the cover plate 500 blocks the mounting through hole 301, preventing fingers from being inserted into the mounting through hole 301, thus avoiding finger injuries and making it safer to use. When the flap assembly 400 is in the closed state, the cover plate 500 is located inside the fume hood 300 and the distance between it and the top surface of the fume hood 300 is greater than a set value.

[0095] The specific structure of the cover plate 500 is not limited, as long as it can move with the connecting rod 100 and can cover the mounting through hole 301. In this embodiment, for example... Figures 28 to 30 As shown, the cover plate 500 includes a cover plate body 501, on which two suspension arms 502 are arranged opposite each other, and suspension through holes 503 are provided on the suspension arms 502. The cover plate 500 is directly or indirectly connected to the connecting rod 100 through the suspension arms 502 and the suspension through holes 503. The connection structure is simple and reasonable, and easy to assemble and disassemble.

[0096] When the flap assembly 400 flips, the connecting rod 100 rotates synchronously, and the cover plate 500 moves synchronously with the connecting rod 100. This ensures that when the flap assembly 400 is open, the cover plate 500 blocks the mounting through hole 301, preventing fingers from being inserted into it. When the flap assembly 400 is closed, the cover plate 500 moves with the connecting rod 100 towards the inner top surface of the smoke hood 300. When the cover plate 500 hits the inner top surface of the smoke hood 300, it will swing in the opposite direction around the suspension through hole 503, preventing a hard collision between the cover plate 500 and the inner top surface of the smoke hood 300, thus improving safety. The specific angle of the reverse swing of the cover plate 500 is not limited, and the spatial posture of the cover plate 500 after the reverse swing is mostly tilted, ensuring that the minimum distance between the cover plate body 501 and the top surface of the smoke hood 300 (i.e., the distance between the highest point of the cover plate body 501 and the top surface of the smoke hood 300) is greater than a set value.

[0097] Alternatively, the cover body 501 can be fixedly connected to the connecting rod 100. When the flap assembly 400 is in the closed state, the minimum distance between the cover body 501 and the top surface of the smoke hood 300 is greater than a set value. The specific method for achieving the above effect is not limited; the shape of the convex curve 2 can be adjusted, or the connection position and tilt angle of the cover body 501 on the connecting rod 100 can be changed. Other methods in the prior art are also acceptable.

[0098] To ensure the cover plate 500 tightly covers the mounting through hole 301 and to prevent a hard collision between the cover plate 500 and the inner top surface of the smoke hood 300, the cover plate 500 can also be made of a flexible material with elastic deformation capabilities, such as, but not limited to, rubber and plastic. The area of ​​the cover plate 500 is slightly larger than the mounting through hole 301. When the flap assembly 400 is fully opened, the cover plate 500 directly covers or, after slight elastic deformation, completely covers the mounting through hole 301, resulting in a better covering effect. When the flap assembly 400 closes the smoke collection port, the cover plate 500 moves with the connecting rod 100 to the inner top surface of the smoke collection hood 300. Because the cover plate 500 has the ability to elastically deform, there will be no hard collision between the cover plate 500 and the inner top surface of the smoke collection hood 300. That is, the cover plate 500 will undergo a certain degree of elastic deformation under the pressure of the top surface of the smoke collection hood 300, avoiding deformation of the smoke collection hood 300 due to the pressure of the cover plate 500, thus extending the service life of the cover plate 500 and the smoke collection hood 300. In this structure, the suspension through hole 503 on the cover plate 500 can be eliminated. The cover plate 500 is fixedly connected to the connecting rod 100, and the cover plate 500 cannot rotate around the center of the suspension through hole 503, making the overall structure simpler.

[0099] The cover plate 500 can be directly mounted on the connecting rod 100, or it can be mounted on other structures that can move synchronously with the connecting rod 100, or it can be mounted on both the connecting rod 100 and other structures simultaneously. For example... Figures 31 to 34 As shown, the fume extraction device also includes a connecting rod cover assembly, which includes a wiring section 601 and a mounting section 602 connected to each other. The wiring section 601 is detachably connected to the connecting rod 100 and is used to protect the wiring 700. The mounting section 602 is connected to the flap assembly 400 and is used to assist in fixing the wiring section 601. After assembly, the wiring section 601 can move synchronously with the connecting rod 100, and the wiring section 601 has a wire passage 603 for passing the wiring 700 through it.

[0100] The wiring section 601 has a side opening and a shape roughly the same as that of the connecting rod 100. The wiring section 601 is fitted onto the outside of the connecting rod 100 through this side opening. A first suspension member 605 is provided on the wiring section 601, and a second suspension member 103 is provided on the side of the connecting rod 100 exposed outside the wiring section 601. The first suspension member 605 and the second suspension member 103 are positioned opposite each other. Two suspension through holes 503 are respectively fitted onto the corresponding first suspension member 605 and second suspension member 103, achieving a stable connection of the cover plate 500. It can be understood that when suspension members are provided on opposite sides of the connecting rod 100, the two suspension through holes 503 are respectively fitted onto the corresponding suspension members on the connecting rod 100, and the usage method is the same.

[0101] A first limiting member 504 is provided on the cover body 501, and a second limiting member 606 is provided on the wiring section 601. The first limiting member 504 is located between the second limiting member 606 and the mounting through hole 301. After assembly, the second limiting member 606 can abut against the side of the stepped first limiting member 504, or initially there is a gap between the second limiting member 606 and the side of the first limiting member 504. The second limiting member 606 and the mounting through hole 301 are located on opposite sides of the first limiting member 504. When the flap assembly 400 is opened, the second limiting member 606 abuts against the first limiting member 504, so that the cover 500 presses against the mounting through hole 301; when the flap assembly 400 is closed, the second limiting member 606 is outside the path of the cover body 501's reverse swing and will not obstruct the cover body 501's reverse swing. It is understandable that the connecting rod 100 may also have other structures besides the second limiting member 606, and all structures need to be set in a position that does not obstruct the reverse swing of the cover plate body 501.

[0102] That is, when the cover plate 500 blocks the mounting through hole 301, the second limiting member 606 presses the first limiting member 504 towards the mounting through hole 301 from the rear. When someone pushes the cover plate 500 with their finger, the second limiting member 606 can prevent the cover plate 500 from swinging away from the mounting through hole 301, thus preventing the mounting through hole 301 from opening and making it safer to use. The direction of the first limiting member 504 towards the mounting through hole 301 is considered forward, and the direction of the first limiting member 504 away from the mounting through hole 301 is considered rearward.

[0103] The specific connection method between the wiring part 601 and the connecting rod 100 is not limited. In this embodiment, the wiring part 601 is provided with a buckle 604. After the wiring part 601 is sleeved on the outside of the connecting rod 100, the buckle 604 is fastened to the connecting rod 100, so that the wiring part 601 can tightly hold the connecting rod 100, and the connection structure is tighter.

[0104] The cable guide 603 is semi-open, allowing the cable 700 to be directly embedded in the cable routing section 601 without the need for additional drilling, resulting in high work efficiency and low labor intensity. The edges of the cable guide 603 are rounded, which can prevent cutting or even severing the cable 700 and extend the service life of the cable 700.

[0105] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A fume extraction device, comprising a connecting rod (100), a fume hood (300), and a flap assembly (400), wherein one end of the connecting rod (100) is connected to the flap assembly (400), and the other end of the connecting rod (100) is movably connected to the inner wall of the fume hood (300), and the fume hood (300) has a mounting through hole (301) for the connecting rod (100) to pass through, characterized in that, When the flap assembly (400) is in the open state, the closed state, and when switching between the open state and the closed state, the distance between the connecting rod (100) and the edge of the mounting through hole (301) and the top surface of the smoke hood (300) is always greater than a set value during the movement. The connecting rod (100) includes a concave curve (1), an end curve (3), and a convex curve (2) connected in sequence. The concave curve (1) and the convex curve (2) are each formed by connecting at least two curves with different radii, and there is a smooth transition between adjacent curves. During the movement of the connecting rod (100), the distance between the concave curve (1) and the edge of the mounting through hole (301) is always greater than a set value, and the distance between the convex curve (2) and the edge of the mounting through hole (301) and the top surface of the smoke hood (300) is always greater than a set value. The concave curve (1) includes a transition concave sub-curve N1, a cover end connecting concave sub-curve, an avoidance concave sub-curve N4 and a plate end connecting concave sub-curve connected sequentially from the end of the end curve (3). The radius RN4 of the avoidance concave sub-curve N4 is smaller than the radius of all the other concave sub-curves. The plate end connecting concave sub-curve also includes a fifth concave sub-curve N5, a sixth concave sub-curve N6 and a seventh concave sub-curve N7 connected sequentially from the end of the avoidance concave sub-curve N4 in a direction away from the end curve (3), and the radii of the fifth concave sub-curve N5, the sixth concave sub-curve N6 and the seventh concave sub-curve N7 gradually increase; The line connecting the center of the transition concave sub-curve N1 and the center O of the end curve (3) forms a straight line Q, and the distance between the transition concave sub-curve N1 and the straight line Q is H; The convex curve (2) includes a transition convex sub-curve W1, a cover end connecting convex sub-curve, a clearance convex sub-curve W4 and a plate end connecting convex sub-curve connected sequentially from the end of the end curve (3). The radius RW4 of the clearance convex sub-curve W4 is greater than the radius of all the other convex sub-curves. The outer convex curve connecting the cover end includes an outer convex curve reinforcement section W3 that is connected to the end of the avoidance outer convex curve W4 and extends toward the end curve (3).

2. The fume extraction device according to claim 1, characterized in that, 5mm≤H≤8mm; and / or, The distance between the avoidance concave sub-curve N4 and the nearest limiting point is X, where 4mm ≤ X ≤ 6mm.

3. The fume extraction device according to claim 1, characterized in that, The distance between the reinforced segment W3 of the convex sub-curve and the nearest limiting point is Z, 3mm ≤ Z ≤ 5mm; and / or, The distance between the concave curve (1) and the convex curve (2) is Y, where 10mm ≤ Y ≤ 15mm.

4. The fume extraction device according to any one of claims 1 to 3, characterized in that, The fume extraction device also includes a cover plate (500), which is connected to the connecting rod (100). When the flap assembly (400) is in the open state, the cover plate (500) blocks the mounting through hole (301). When the flap assembly (400) is in the closed state, the distance between the cover plate (500) and the top surface of the fume hood (300) is greater than a set value.

5. The fume extraction device according to claim 4, characterized in that, The cover plate (500) includes a cover plate body (501), which is movably connected to the connecting rod (100). When the flap assembly (400) is in the closed state, the cover plate body (501) can abut against the top surface of the smoke hood (300) and rotate in the opposite direction, so that the minimum distance between the cover plate body (501) and the top surface of the smoke hood (300) is greater than a set value; or, The cover plate (500) includes a cover plate body (501), which is fixedly connected to the connecting rod (100); when the flap assembly (400) is in the closed state, the minimum distance between the cover plate body (501) and the top surface of the smoke hood (300) is greater than a set value.

6. The fume extraction device according to claim 5, characterized in that, When the cover plate body (501) is hinged to the connecting rod (100), two suspension arms (502) are arranged opposite each other on the cover plate body (501), and suspension through holes (503) are opened on the suspension arms (502). At least one second suspension member (103) is provided on the connecting rod (100), and one of the suspension through holes (503) is sleeved on the second suspension member (103); and / or, The cover plate body (501) is provided with a first limiting member (504), and the connecting rod (100) is provided with a second limiting member (606). The first limiting member (504) is located between the second limiting member (606) and the mounting through hole (301). When the flap assembly (400) is opened, the second limiting member (606) abuts against the first limiting member (504) so ​​that the cover plate (500) presses against the mounting through hole (301).

7. The fume extraction device according to any one of claims 1 to 3, characterized in that, The fume extraction device also includes a cover plate (500), which is connected to the connecting rod (100) and is made of a flexible material with elastic deformation capability. When the flap assembly (400) is in the open state, the cover plate (500) covers the mounting through hole (301). When the flap assembly (400) is in the closed state, the cover plate (500) undergoes elastic deformation to avoid the cover plate (500) pressing the top surface of the fume hood (300) and causing the fume hood (300) to deform.

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