A smoke baffle motion mechanism and range hood using the same

Abstract

The present invention discloses a smoke damper movement mechanism, including a smoke damper and a movement mechanism, the movement mechanism including a driving mechanism and a transmission mechanism, the transmission mechanism including: a first hinge, as a driven arm, having a first end and a second end opposite to each other, the second end of the first hinge being rotatably connected to the smoke damper; a second hinge, as a driving arm driven by the driving mechanism, having a first end and a second end opposite to each other, the second end of the second hinge being rotatably connected to the smoke damper, the connection position between the first hinge and the smoke damper being located above the connection position between the second hinge and the smoke damper; a transmission rod, connected between the driving mechanism and the first end of the second hinge, transmitting the driving force of the driving mechanism to the second hinge; an auxiliary closing mechanism, arranged at the first end of the first hinge, at the extreme position of the movement of the smoke damper, the transmission rod applies downward pressure to the auxiliary closing mechanism, so that the first hinge tightens the smoke damper. Also disclosed is a range hood having the above-mentioned smoke damper movement mechanism applied thereto.

Description

Technical Field

[0001] The invention relates to an oil fume purification device, in particular to a fume baffle motion mechanism and an oil fume extractor using the motion mechanism. Background Art

[0002] Range hoods have become one of the indispensable kitchen appliances in modern families. Range hoods work based on the principle of fluid dynamics. A centrifugal fan installed inside the range hood absorbs and exhausts oil fumes, and uses a filter to filter out some grease particles. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor that drives the impeller to rotate. When the impeller rotates, negative pressure suction is generated at the center of the fan, sucking the oil fumes under the range hood into the fan. After being accelerated by the fan, the fumes are collected by the volute and guided to be discharged outdoors.

[0003] Existing side-suction range hoods usually have an air inlet on the panel. In order to prevent the air inlet from being exposed and unsightly when the range hood is not working and to prevent oil smoke from flowing back, a smoke baffle is provided at the air inlet, which can also collect smoke when the range hood is working. For example, a side-suction range hood air curtain device and a range hood using the air curtain device disclosed in a Chinese patent with application number 201920284467.1 include a casing, a suction port is provided on the casing, and a smoke baffle is provided on the casing for covering or opening the suction port, the angle between the smoke baffle and the casing is adjustable, and the smoke baffle can cover or open the suction port; another example is a smoke baffle opening and closing device and a side-suction range hood disclosed in a Chinese patent with application number 201920106266.2, the smoke baffle opening and closing device includes a driving component, two sets of connecting rod mechanisms arranged at intervals in the smoke hood along the left and right directions, and a first shaft and a second shaft connected between the two sets of connecting rod mechanisms, the first shaft and the second shaft are both pivotally connected to the smoke hood, and the two are spaced apart in the upper and lower directions; the connecting rod mechanism includes a first connecting rod and a second connecting rod, the first connecting rod is fixedly mounted on the first shaft, the second connecting rod is fixedly mounted on the second shaft, and the output ends of the first connecting rod and the second connecting rod are respectively hinged at different positions of the smoke baffle.

[0004] The existing range hoods of this type generally adopt a flip-up upper panel or middle panel (smoke shield), that is, the air inlet is usually arranged in the upper middle position of the whole machine. After opening, the air inlet is about 400mm away from the pot in the vertical direction. There are the following problems: ① The air inlet is far away from the pot, and the negative pressure decays significantly. At this time, increasing the negative pressure by increasing the fan speed will not effectively improve the smoking effect; ② In order to ensure the smoking effect, the smoke shield needs to be about 440mm away from the wall to achieve a better smoke-collecting effect, which also brings about experience problems such as blocking the line of sight and bumping heads.

[0005] In addition, the movement mechanism of the smoke deflector of the existing range hood usually has only one connection point with the smoke deflector, resulting in insufficient movement stability of the smoke deflector. In addition, an electric push rod is usually used to directly connect to the rear plate of the shell, and the remaining transmission parts are in an active state or rotate around the connection with the side plate. As a result, the rigidity of the shell, the rigidity of the movement mechanism and the flipping consistency of the smoke deflector are all poor, which affects and reduces the user experience. Summary of the invention

[0006] The first technical problem to be solved by the present invention is to provide a smoke baffle movement mechanism in view of the deficiencies in the above-mentioned prior art, which can enhance the stability and life of the movement mechanism.

[0007] The second technical problem to be solved by the present invention is to provide a range hood using the above-mentioned smoke baffle movement mechanism.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a smoke shield movement mechanism, including a smoke shield and a movement mechanism for driving the smoke shield to move, the movement mechanism including a driving mechanism and a transmission mechanism for transmitting the output of the driving mechanism to the smoke shield, characterized in that:

[0009] The transmission mechanism comprises:

[0010] A first hinge, serving as a driven arm, having a first end and a second end opposite to each other, wherein the second end of the first hinge is rotatably connected to the smoke baffle;

[0011] a second hinge, serving as a driving arm driven by the driving mechanism, having a first end and a second end opposite to each other, the second end of the second hinge being rotatably connected to the smoke shield, and a connection position between the first hinge and the smoke shield being located above a connection position between the second hinge and the smoke shield;

[0012] A transmission rod connected between the driving mechanism and the first end of the second hinge to transmit the driving force of the driving mechanism to the second hinge;

[0013] The auxiliary closing mechanism is arranged at the first end of the first hinge. At the extreme position of the movement of the smoke shield, the transmission rod applies downward pressure to the auxiliary closing mechanism, so that the first hinge tightens the smoke shield.

[0014] In order to improve the consistency of the movement of the transmission mechanism, the movement mechanism also includes a fixed support beam, the first hinge is located between the first end and the second end of the first hinge, is rotatably connected to the support beam, and the connection is the center of rotation, and the second hinge is located between the first end and the second end of the second hinge, is rotatably connected to the support beam, and the connection is the center of rotation.

[0015] In order to ensure that an upward tensioning force is applied to the smoke baffle, the first hinge extends in two opposite directions on both sides of the rotation center.

[0016] Preferably, to facilitate the transmission of driving force, the transmission rod includes a first connecting rod and a second connecting rod, the second end of the second hinge is rotatably connected to one end of the second connecting rod, the other end of the second connecting rod is rotatably connected to one end of the first connecting rod, and the other end of the first connecting rod is driven to rotate by a driving mechanism. At the extreme position of the movement of the smoke shield, the auxiliary closing mechanism is located below the second connecting rod and is interference fit.

[0017] In order to maintain the consistency of movement on both sides of the smoke shield, the movement mechanism includes an active end and a driven end, the active end includes the driving mechanism, the active end and the driven end are respectively arranged on both sides of the smoke shield, the driven end and the active end both include the transmission mechanism, the active end and the driven end are connected by a connecting shaft and move synchronously, the two ends of the connecting shaft are respectively connected and fixed to the first connecting rod of the active end and the first connecting rod of the driven end, and the output end of the driving mechanism drives the connecting shaft to rotate around its own axis.

[0018] In order to improve the stability of the movement of the transmission mechanism and the synchronization of the movement of the two sides of the smoke baffle, a fixed bracket is arranged on the support beam, and the two ends of the connecting shaft pass through the corresponding fixed brackets respectively and are rotatably connected.

[0019] Preferably, the driving mechanism is an electric push rod, and a third connecting rod is arranged on the output end of the driving mechanism, one end of the third connecting rod is rotatably connected to the output end of the driving mechanism, and the other end is fixed to the connecting shaft.

[0020] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a range hood using the smoke baffle movement mechanism as described above, comprising a shell, with an air inlet formed on the front side of the shell, and characterized in that: the smoke baffle can be in a first position closing the air inlet and a second position opening the air inlet under the drive of the movement mechanism, and the first position and the second position are the extreme positions of the movement of the smoke baffle.

[0021] In order to make the air inlet close to the smoke source, the negative pressure attenuation is less, and the smoking effect is greatly improved, the front side of the shell is respectively provided with an upper panel and a lower panel as a smoke baffle from top to bottom, and the air inlet is opened below the upper panel.

[0022] Compared with the prior art, the advantages of the present invention are: by setting a double hinge structure, the smoke damper can perform a compound movement of translation and rotation, which is convenient for opening the smoke damper at a desired position and angle, and an auxiliary closing mechanism is set at the hinge serving as the driven arm, so that the upper and lower hinge points are subjected to force at the same time, and the gravity moment is offset, thereby improving the force condition and increasing the stability and life of the motion mechanism; by setting a support beam, an installation interface is provided for the transmission mechanism, thereby improving the consistency of movement of various parts of the transmission mechanism; by setting a coupling, the active end and the driven end of the motion mechanism are connected, so that the two sides of the smoke damper move synchronously; the coupling and the fixed bracket on the support beam are rotatably connected to reduce deformation, thereby further improving the consistency of the movement of the transmission mechanism and the synchronization of movement of the two sides of the smoke damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a range hood in an open state according to an embodiment of the present invention;

[0024] Figure 2 A partial side view of the range hood in an open state according to an embodiment of the present invention;

[0025] Figure 3 It is a partial schematic diagram of the lower panel assembly and the motion mechanism of the range hood according to the embodiment of the present invention;

[0026] Figure 4 It is a partial schematic diagram of the movement mechanism of the range hood according to the embodiment of the present invention in the open state;

[0027] Figure 5 for Figure 2 A schematic diagram of the partial enlargement of Ⅰ;

[0028] Figure 6 is a schematic diagram of a range hood in a closed state according to an embodiment of the present invention;

[0029] Figure 7 A partial side view of the range hood in a closed state according to an embodiment of the present invention;

[0030] Figure 8 It is a partial schematic diagram of the movement mechanism of the range hood according to the embodiment of the present invention in a closed state;

[0031] Fig. 9 for Figure 7 A schematic diagram of the partial II enlargement. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0034] See also Figure 1 to Figure 4 , Figure 6 A range hood is a side-suction range hood, comprising a shell 1, the front side of the shell 1 is open and gradually tilted backward from top to bottom, and an upper panel 2 and a lower panel assembly 3 are respectively arranged at the open part of the shell 1 from top to bottom. An air inlet 11 is formed at the front side of the shell 1 and at a position corresponding to the lower panel assembly 3, and the air inlet 11 is opened below the upper panel 2. The upper panel 2 and the shell 1 are fixedly arranged, while the lower panel assembly 3 can translate and rotate relative to the shell 1, so as to open or close the air inlet 11. The shell 1 also includes side panels 12 located on the left and right sides, and a top rear panel 13 arranged between the side panels 12, the top rear panel 13 includes a top panel 132 and a rear panel 131, and the top panel 132 and the rear panel 131 can be integrated or can be a split structure connected together.

[0035] The lower panel assembly 3 serves as a smoke baffle, including a lower panel 31, a first baffle 32, a second baffle 33 and a third baffle 34. The shape and size of the lower panel 31 correspond to the air inlet 11. The first baffle 32 extends from the bottom of the lower panel 31 into the shell 1. The second baffle 33 has two, which are respectively arranged on both sides of the first baffle 33. The third baffle 34 is connected between the rear sides of the first baffle 32 and the second baffle 33. The first baffle 32, the second baffle 33 and the third baffle 34 form a cover body with a triangular longitudinal cross-section, and are connected and fixed to the lower panel 31 so that the lower panel assembly 3 constitutes a relatively closed space.

[0036] Of course, the lower panel assembly 3 of the present invention may also be replaced by a conventional plate-shaped smoke baffle.

[0037] A fan frame 4 is arranged above the housing 1, and a fan system (not shown) is arranged inside the fan frame 4, thereby forming a range hood with a fan mounted on top. An oil cup 8 is arranged at the bottom of the housing 1.

[0038] When the range hood is closed, the upper panel 2 and the lower panel 31 form a whole large plane, which is the first position of the lower panel assembly 3. When the range hood is working and in the open state, the lower panel assembly 3 can move to the front of the upper panel 2 and open the air inlet 11, which is the second position of the lower panel assembly 3. When the range hood is turned on and in the working state, there is a certain gap between the lower panel assembly 3 and the upper panel 2, and the first baffle 32 of the lower panel assembly 3 gradually tilts upward from front to back to form a guide structure. The angle between the lower panel 31 and the vertical direction is 20 to 50 degrees, and the distance between the lower end of the lower panel 31 and the pot is 340 to 430 mm. In order to ensure the best smoke collection effect and user experience, when the range hood is installed on the wall, the distance between the bottom of the lower panel 31 and the wall is 360 to 380 mm.

[0039] In order to facilitate the automatic driving of the lower panel assembly 3, a motion mechanism is provided on the side of the lower panel assembly 3 facing the inside of the shell 1, including a support beam 371 fixed in the shell 1, a drive mechanism 372, a first hinge 373, a second hinge 374, a first connecting rod 375, a second connecting rod 376 and a connecting bracket 378. The two ends of the support beam 371 are respectively connected and fixed to the upper panel 2 and the rear plate 131 of the top rear plate 13 of the shell 1. The first connecting rod 375 and the second connecting rod 376 serve as transmission rods between the drive mechanism 372 and the drive arm (one of the first hinge 373 and the second hinge 374) to transmit the driving force to the drive arm.

[0040] A fixed bracket 3712 is provided on the support beam 371, and the fixed bracket 3712 is arranged forward. A panel bracket 312 is provided on the side of the lower panel 31 facing the inside of the housing 1, and a connecting bracket 378 is fixedly provided on the panel bracket 312, and the inclination direction of the connecting bracket 378 is consistent with that of the lower panel 31. The first hinge 373 is bent, preferably, in a roughly V-shaped shape, with the opening facing forward. The first hinge 373 has a first end and a second end opposite to each other, and the position close to the first end is rotatably connected to the fixed bracket 3712, and the connection is the rotation center of the first hinge 373, and the second end is rotatably connected to the upper end of the connecting bracket 378. The second hinge 374 can be in a long strip shape, which also has a first end and a second end opposite to each other, and the first end of the second hinge 374 is rotatably connected to one end of the second connecting rod 376, and the second end is rotatably connected to the lower end of the connecting bracket 378, and the second hinge 374 is located between the first end and the second end and is rotatably connected to the support beam 371, and the connection is the rotation center of the second hinge 374. The above-mentioned connection at the end includes a connection at the end and a connection close to the end.

[0041] The support beam 371 is in the shape of a hollow column, and the second hinge 374 passes upward from the middle of the support beam 371. The fixed bracket 3712 is arranged on one of the left and right sides of the support beam 371, preferably on the side away from the other support beam 371, such as being arranged on the right side of the support beam 371 on the right side, that is, equivalent to the outer side of the support beam 371. The first hinge 373 is arranged on the outer side of the fixed bracket 3712, such as the first hinge 373 is arranged on the right side of the fixed bracket 3712 on the right side.

[0042] Alternatively, the first hinge 373 and the second hinge 374 are respectively rotatably connected directly to the panel bracket 312 .

[0043] The connection between the first hinge 373 and the panel bracket 312 is located above the connection between the second hinge 374 and the panel bracket 312. Optionally, the first hinge 373 and the second hinge 374 can also be connected to the lower panel 31 through two independent panel brackets 312.

[0044] The second connecting rod 376 is preferably in an upwardly protruding arc shape, one end of which is rotatably connected to the second hinge 374 , and the other end of the second connecting rod 376 is rotatably connected to one end of the first connecting rod 375 .

[0045] The motion mechanism has an active end and a driven end (not shown). As the motion mechanism of the driven end, the driving mechanism 372 does not need to be provided, and the other structures are the same as the active end. The active end and the driven end are respectively arranged on the left and right sides of the lower panel 31. The end of the first connecting rod 375 of the active end away from the second connecting rod 376 and the end of the first connecting rod 375 of the driven end away from the second connecting rod 376 are connected by a connecting shaft 377. The connecting shaft 377 passes through the end of each first connecting rod 375 and is connected to the first connecting rod 375, so that when the connecting shaft 377 rotates, each first connecting rod 375 can be driven to rotate accordingly. The connecting shaft 377 extends in the left and right directions so that the motion mechanisms on both sides of the lower panel 31 can move synchronously and can be smoothly opened and closed.

[0046] Based on space considerations, by setting a connecting rod mechanism composed of a first connecting rod 375 and a second connecting rod 376, the load rotation center (the rotation center where the connecting shaft 377 is located) is transferred to a position close to the lower panel 31, so that it can be easily installed. The second hinge 374 is a driving arm, and the first hinge 373 is a driven arm. The rotation axes of the rotation connection points of the above-mentioned first hinge 373, the second hinge 374, the second connecting rod 376 and the first connecting rod 375 all extend in the left and right directions. Both ends of the second connecting rod 376 can be located above the support beam 371, or one end can be located above the support beam 371 and the other end can be located below the support beam 371. The two ends of the connecting shaft 377 are also respectively arranged on the fixed bracket 3712, and can rotate relative to the fixed bracket 3712.

[0047] The connecting shaft 377 is driven by the driving mechanism 372. In this embodiment, the driving mechanism 372 is an electric push rod. Figure 3 , and the driving mechanism 372 is hidden in the other figures. The driving mechanism 372 is rotatably connected to the rear plate 131 of the top rear plate 13 of the housing 1 through the connecting seat 3721, and the rotating shaft extends in the left-right direction. A third connecting rod 3722 is provided on the output end of the driving mechanism 372, one end of the third connecting rod 3722 is rotatably connected to the output end of the driving mechanism 372, and the other end is fixed to the connecting shaft 377. The end of the third connecting rod 3722 can be sleeved on the outer periphery of the connecting shaft 377 and fixed, and the rotating shaft connected to the driving mechanism 372 at the other end extends in the left-right direction. Therefore, when the driving mechanism 372 is started, the connecting shaft 377 can be driven to rotate around its own axis. The driving mechanism 372 is arranged on the inner side of the support beam 371, such as on the left side of the support beam 371 on the right side, so that the driving mechanism 372 and the first hinge 373 are respectively located on the left and right sides of the support beam 371. Alternatively, the driving mechanism 372 can also be arranged on the support beam 371.

[0048] When the driving mechanism 372 is started, the third connecting rod 3722 drives the connecting shaft 377 to rotate, thereby the connecting shaft 377 drives the first connecting rod 375 at the active end and the driven end to rotate synchronously around the connecting shaft 377, and then drives the second connecting rod 376 to rotate, and drives the second hinge 374 to rotate through the second connecting rod 376. The second hinge 374, the panel bracket 312, the first hinge 373, the support beam 371 and the fixed bracket 3712 form a four-bar structure. When the second hinge 374 is driven by the second connecting rod 376, it can drive the lower panel 31 to move. In this way, the lower panel 31 moves from the first position of closing the air inlet 11 to the second position located on the front side of the upper panel 2 through the composite movement of translation and rotation, and can also return from the second position to the first position of closing the air inlet 11 through the composite movement of translation and rotation. After the lower panel 31 is opened, it is preferably basically vertical for easy operation.

[0049] By setting the first hinge 373 and the second hinge 374, the movement trajectories of the upper and lower hinge points of the lower panel 31 are controlled respectively, so that the lower panel 31 can achieve a compound movement of translation and rotation. Since the double hinge structure itself has a large amount of shaking, there are two active points at the non-active end, and it is impossible to move synchronously, so a connecting shaft 377 is added to realize the transmission of torque and increase the synchronization of the movement of the left and right sides. The thrust of the electric push rod is amplified by the double four-link series design of the active end and the driven end.

[0050] During the movement of the motion mechanism, multiple rotating pairs have rotational clearance and wear. After tens of thousands of times of opening and closing, the wear will increase and eventually be transmitted to the movement of the smoke baffle, resulting in problems such as uneven movement and loose closing. In order to solve the problem that the whole machine cannot be in place when opened and closed, and to make up for the increased clearance after multiple movements, an auxiliary closing mechanism 379 is provided at the first end of the first hinge 373. The first hinge 373 is bent backward from the connection with the fixed bracket 3712, and the end of the bent part is the first end of the first hinge 373. The auxiliary closing mechanism 379 is provided on the first end. In this embodiment, the auxiliary closing mechanism 379 is in the form of a limit block, extending from the end of the first hinge 373 to the direction of the second connecting rod 376, and is located below the second connecting rod 376. The first end and the second end of the first hinge 373 are respectively located at the front and rear sides of the rotation center of the first hinge 373.

[0051] See also Figure 6 to Figure 8 , the range hood is in a closed state, at which time the portion from the rotation center to the second end of the first hinge 373 is located behind the rotation center, the portion from the rotation center to the first end of the first hinge 373 is located in front of the rotation center, and the auxiliary closing mechanism 379 is located at the frontmost side of the first hinge 373. The first end of the second hinge 374 is located in front of the second end.

[0052] See also Figure 7 and Fig. 9 When the driving mechanism 372 is started and the smoke baffle is opened, the connecting shaft 377 is driven to rotate ( Figure 7 , it is shown as counterclockwise rotation), whereby the first connecting rod 375 also rotates counterclockwise, that is, the end connected to the second connecting rod 376 rotates backward, pushing the second connecting rod 376 backward, and the second connecting rod 376 pushes the first end of the second hinge 374 downward and backward, whereby the second hinge 374 pushes the lower panel 31 forward and upward, and the first hinge 373 rotates with the movement of the lower panel 31, that is, the second end gradually rotates forward, and the first end gradually rotates backward, so that the auxiliary closing mechanism 379 keeps synchronization with the second connecting rod 376; when reaching the open position, the second connecting rod 376 applies vertical downward pressure to the auxiliary closing mechanism 379, see Figure 7 and Fig. 9As shown by the arrow in , it is the direction of pressure application. The auxiliary closing mechanism 379 is subjected to force and transmitted to the first hinge 373. The first hinge 373 is transmitted to the connection with the lower panel 31 through the rotation center. The upper end of the lower panel 31 is in a tightened state, so it will not fall due to gravity, and it can be ensured to be fully opened. This pressure is achieved by squeezing the second connecting rod 376 and the first hinge 373 at the closing moment. Therefore, when closing, the second connecting rod 376 and the auxiliary closing mechanism 379 on the first hinge 373 should have an interference of 1 to 5 mm, thereby generating a clamping force, and the magnitude of the force is adjusted by the interference. When the motion mechanism is opened, the auxiliary closing mechanism 379 cannot interfere with other structures. When fully opened, the portion from the rotation center of the first hinge 373 to the second end is located in front of the rotation center, the portion from the rotation center of the first hinge 373 to the first end is located behind the rotation center, the auxiliary closing mechanism 379 is located at the rear side of the first hinge 373, and the first end of the second hinge 374 is located behind the second end. Figure 2 .

[0053] Similarly, when the drive mechanism 372 is started and operates in the reverse direction, see Figure 2 and Figure 5 , driving the connecting shaft 377 to rotate ( Figure 2 , it is shown as clockwise rotation), whereby the first connecting rod 375 also rotates clockwise, that is, the end connected to the second connecting rod 376 rotates forward, pulling the second connecting rod 376 forward, and the second connecting rod 376 pulls the first end of the second hinge 374 forward and upward, whereby the second hinge 374 pulls the lower panel 31 backward and downward, and the first hinge 373 rotates with the movement of the lower panel 31, that is, the second end gradually rotates backward, and the first end gradually rotates forward, so that the auxiliary closing mechanism 379 keeps synchronization with the second connecting rod 376; when reaching the closed position, the second connecting rod 376 applies vertical downward pressure to the auxiliary closing mechanism 379, see Figure 2 and Figure 5 As shown by the arrow in the figure, which is the direction of pressure application, the auxiliary closing mechanism 379 is subjected to force and transmitted to the first hinge 373, and the first hinge 373 is transmitted to the connection with the lower panel 31 through the rotation center, and the upper end of the lower panel 31 is in a tensioned state ( Figure 8 The arrow in the middle indicates the direction of the pulling force), so it will not fall due to gravity, ensuring that it is closed in place. This pressure is achieved by squeezing the second connecting rod 376 and the first hinge 373 at the closing moment. Therefore, when closing, the second connecting rod 376 and the auxiliary closing mechanism 379 on the first hinge 373 should have an interference of 1 to 5 mm to generate a clamping force, and the magnitude of the force is adjusted by the interference. When the motion mechanism is opened, the auxiliary closing mechanism 379 cannot interfere with other structures.

[0054] After adding the auxiliary closing mechanism 379, the stress condition of the smoke shield when it moves to the extreme position (in this embodiment, it refers to the fully open and closed positions, and the open position can be set as needed). If the auxiliary closing mechanism 379 is not provided, only the connection between the second hinge 374 and the lower panel 31 is stressed, and the lower panel 31 is acted upon by gravity and gravity moment; after adding the auxiliary closing mechanism 379, the upper and lower positions where the lower panel 31 is connected to the two hinges are stressed at the same time, and the gravity moment is offset, thereby improving the stress condition and increasing the stability and life of the movement mechanism.

[0055] When the driving mechanism 372 drives the lower panel 31 to close, it needs to output a large pulling force. At this time, the top rear panel 13 is easily deformed by pulling. However, in this embodiment, due to the addition of the support beam 371, the rigidity of the connection between the support beam 371 and the top rear panel 13 is greatly improved, and deformation will no longer occur. The support beam 371 can support the weight of the lower panel assembly 3, and is the interface of the various rods (transmission mechanisms composed of various hinges, connecting rods, and connecting shafts) that control the movement trajectory of the lower panel assembly 3. It connects the top rear panel 13 and the upper panel 2 of the shell 1, enhances the rigidity of the shell 1, and improves the ability to resist falling during transportation.

[0056] In the prior art, the bracket (the structure corresponding to the fixed bracket 3712 of the present invention) that is usually used to connect with the rotation center of the transmission part of the connecting shaft 377 or the motion mechanism is set on the side plate 12 of the shell 1. However, due to the small area and thin thickness of the connection position with the side plate 12, and the large pulling force output by the output end of the driving mechanism 372, it is easy to cause the bracket to deform, resulting in the smoke baffle not being closed tightly, the active end and the driven end being deformed inconsistently, and the two sides of the smoke baffle being out of sync. In the present invention, the fixed bracket 3712 is set on the support beam 371, and the connecting shaft 377 is rotatably connected to the fixed bracket 3712, which can avoid the problem of easy deformation. In addition, the support beam 371 is used as an interface for each hinge or connecting rod of the motion mechanism, that is, the rotation centers of the first hinge 373, the second hinge 374, the first connecting rod 375 and the connecting shaft 377 are all on the support beam 371 (fixed bracket 3712), which maintains the movement consistency of the above-mentioned transmission components and improves the user experience.

Claims

1. A smoke shield movement mechanism, comprising a smoke shield and a movement mechanism for driving the smoke shield to move, the movement mechanism comprising a drive mechanism (372) and a transmission mechanism for transmitting the output of the drive mechanism (372) to the smoke shield, characterized in that: The transmission mechanism comprises: A first hinge (373), serving as a driven arm, having a first end and a second end opposite to each other, wherein the second end of the first hinge (373) is rotatably connected to the smoke baffle; a second hinge (374), serving as a driving arm driven by the driving mechanism (372), having a first end and a second end opposite to each other, the second end of the second hinge (374) being rotatably connected to the smoke shield, and a connection position between the first hinge (373) and the smoke shield being located above a connection position between the second hinge (374) and the smoke shield; a transmission rod connected between the driving mechanism (372) and the first end of the second hinge (374), transmitting the driving force of the driving mechanism (372) to the second hinge (374), the transmission rod comprising a first connecting rod (375) and a second connecting rod (376), the second end of the second hinge (374) being rotatably connected to one end of the second connecting rod (376), the other end of the second connecting rod (376) being rotatably connected to one end of the first connecting rod (375), and the other end of the first connecting rod (375) being driven to rotate by the driving mechanism (372); and An auxiliary closing mechanism (379) is arranged at the first end of the first hinge (373). At the extreme position of the movement of the smoke shield, the auxiliary closing mechanism (379) is located below the second connecting rod (376) and is interference fit. The transmission rod applies downward pressure to the auxiliary closing mechanism (379), so that the first hinge (373) tightens the smoke shield.

2. The smoke baffle movement mechanism according to claim 1, characterized in that: The motion mechanism also includes a fixed support beam (371), the first hinge (373) is located between its first end and second end and is rotatably connected to the support beam (371) with the connection as the rotation center, and the second hinge (374) is located between its first end and second end and is rotatably connected to the support beam (371) with the connection as the rotation center.

3. The smoke baffle movement mechanism according to claim 2, characterized in that: The first hinge (373) extends in opposite directions on both sides of the rotation center.

4. The smoke baffle movement mechanism according to claim 2, characterized in that: The motion mechanism comprises an active end and a driven end, the active end comprises the driving mechanism (372), the active end and the driven end are respectively arranged on both sides of the smoke baffle, the driven end and the active end both comprise the transmission mechanism, the active end and the driven end are connected via a connecting shaft (377) and move synchronously, the two ends of the connecting shaft (377) are respectively connected and fixed to a first connecting rod (375) at the active end and a first connecting rod (375) at the driven end, and the output end of the driving mechanism (372) drives the connecting shaft (377) to rotate around its own axis.

5. The smoke baffle movement mechanism according to claim 4, characterized in that: The support beam (371) is provided with a fixed bracket (3712), and the two ends of the connecting shaft (377) respectively pass through the corresponding fixed brackets (3712) to be rotatably connected.

6. The smoke baffle movement mechanism according to claim 4, characterized in that: The driving mechanism (372) is an electric push rod, and a third connecting rod (3722) is arranged on the output end of the driving mechanism (372), one end of the third connecting rod (3722) is rotatably connected to the output end of the driving mechanism (372), and the other end is fixed to the connecting shaft (377).

7. A range hood using the smoke baffle movement mechanism according to any one of claims 1 to 6, comprising a housing (1), wherein an air inlet (11) is formed on the front side of the housing (1), and characterized in that: The smoke shield can be driven by the movement mechanism to be in a first position for closing the air inlet (11) and a second position for opening the air inlet (11), wherein the first position and the second position are the extreme positions of the movement of the smoke shield.

8. The range hood according to claim 7, characterized in that: An upper panel (2) and a lower panel (31) serving as a smoke baffle are respectively arranged on the front side of the shell (1) from top to bottom, and the air inlet (11) is opened below the upper panel (2).

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