Range hood

Abstract

The utility model relates to an oil fume extractor, including air inlet box and fume plate movement mechanism, fume plate movement mechanism includes drive motor, two parallelogram link assemblies, two crank link assemblies and linkage rod, and the free end of two parallelogram link assemblies is connected with the movable fume plate, and the linkage rod is connected with two parallelogram link assemblies through the transmission of corresponding crank link assemblies, and the air inlet box is provided with mounting rack board in the position adjacent to the left side or right side of the air inlet box, and the mounting rack board and the corresponding wallboard of the air inlet box define the mounting chamber isolated from the air inlet air duct of the air inlet box, the drive motor is arranged in the mounting chamber, and is fixed relative to the mounting rack board, and the output shaft of drive motor is connected with one end of linkage rod and drives the linkage rod to rotate. Advantages lie in: can effectively improve the problem of hindering air duct airflow and being easily polluted by oil dirt due to improper setting position of drive mechanism.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a range hood. Background Technology

[0002] Range hoods are an indispensable kitchen appliance in modern homes. To improve smoke extraction, range hoods typically have a baffle plate at the air inlet, which opens and closes by moving. Currently, the air inlet panels of existing range hoods are generally categorized into three types: single-section (full-screen), two-section (one section is a fixed panel, and the other is a movable baffle plate), and three-section (the top and bottom sections are fixed panels, and the middle section is a movable baffle plate). For two-section or three-section range hoods, there are at least two independent panels on the same plane. In traditional range hoods, the movable baffle plate opens and closes the air inlet by flipping.

[0003] To achieve a slim range hood design, existing technologies also employ movable smoke plates with a translational composite movement. These are essentially driven by a parallelogram linkage mechanism. For example, Chinese utility model patent application CN202021530141.1 discloses a range hood including a smoke collection chamber with an air inlet, a smoke guide plate adapted to close the air inlet, and a driving device adapted to drive the smoke guide plate. The smoke guide plate is configured to switch between a first position and a second position under the drive of the driving device. When the smoke guide plate is in the first position, it closes the air inlet; when it is in the second position... When the air inlet is open, the driving device includes a motor, a transmission crank, a first parallelogram mechanism, a second parallelogram mechanism, and a synchronizing rod. The motor is located in the smoke collection chamber and drives the transmission crank to rotate. The free end of the transmission crank is hinged to the synchronizing rod. One end of the synchronizing rod is connected to the first parallelogram mechanism, and the other end is connected to the second parallelogram mechanism. The frame components of both the first and second parallelogram mechanisms are located in the smoke collection chamber. The smoke guide plate moves under the combined action of the connecting rods of the first and second parallelogram mechanisms. The smoke guide plate can perform an oblique translational movement relative to the air inlet, and remains in a vertical position throughout the oblique translational movement.

[0004] The output shaft of the drive motor of the motion mechanism of the smoke baffle in the aforementioned patent application is directly connected to the transmission crank, and then connected to the synchronizing rod through the free end of the transmission crank. Finally, the synchronizing rod drives the two parallelogram mechanisms to move. Since its drive mechanism is usually located in the middle area of ​​the left and right directions of the air inlet, it has the following obvious shortcomings: First, the drive motor and transmission crank directly occupy the central core air inlet channel, which significantly hinders the smooth entry of airflow, increases wind resistance and pressure loss, and affects the overall smoke extraction efficiency of the machine; Second, the middle area is where smoke and fumes concentrate, and high-temperature oil and gas and impurities easily adhere to the drive components. Under long-term operation, this may lead to mechanism jamming, increased motor load, and affect the smoothness of movement and the life of components. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a range hood that can effectively improve the problems of airflow obstruction and susceptibility to oil pollution caused by improper setting of the drive mechanism, in light of the current state of the technology.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a range hood, including an air inlet box and a smoke plate moving mechanism. An air inlet is provided at the front of the air inlet box, and a movable smoke plate is provided at the air inlet. The movable smoke plate can move relative to the air inlet box in a translational manner under the drive of the smoke plate moving mechanism, thereby opening and closing the air inlet.

[0007] The smoke plate movement mechanism includes a drive motor, two parallelogram connecting rod assemblies, two crank connecting rod assemblies, and a linkage rod. The two parallelogram connecting rod assemblies are arranged at intervals in the left-right direction. The movable smoke plate is connected to the free ends of the two parallelogram connecting rod assemblies. The linkage rod is rotatably mounted on the air inlet box in a manner that allows it to rotate around its own axis. The linkage rod is connected to the two parallelogram connecting rod assemblies through corresponding crank connecting rod assemblies. A mounting bracket is provided in the air inlet box at a position adjacent to the left or right side of the air inlet box. The mounting bracket and the corresponding wall panel of the air inlet box define an installation chamber isolated from the air inlet duct of the air inlet box. The drive motor is located in the installation chamber and fixed relative to the mounting bracket. The output shaft of the drive motor is connected to one end of the linkage rod and drives the linkage rod to rotate.

[0008] The aforementioned "parallelogram linkage assembly" refers to a four-bar linkage formed by multiple hinged links, wherein opposite links are of equal length and parallel, thereby ensuring that the output end always moves parallel to the input end.

[0009] As an improvement, two mounting plates are arranged at a distance from each other on the left and right sides, respectively, adjacent to the left and right sides of the air inlet box. The two ends of the linkage rod are rotatably supported on the two mounting plates. By supporting the two ends of the linkage rod with the two mounting plates, the rigidity and stability of the linkage rod are enhanced, ensuring smooth rotation and reducing movement deviation and wear.

[0010] As an improvement, the two parallelogram connecting rod assemblies and the two crank connecting rod assemblies are respectively positioned adjacent to the two mounting plates. Positioning the two parallelogram connecting rod assemblies and the crank connecting rod assemblies adjacent to the two mounting plates achieves symmetrical transmission, uniform force distribution, and ensures synchronous left-right translation of the movable smoke plate, improving motion accuracy. In particular, it also avoids the parallelogram connecting rod assemblies and crank connecting rod assemblies occupying the main air duct space of the air inlet box, thus preventing any impact on the smoothness of the air inlet.

[0011] As an improvement, the crank-connecting rod assembly includes a drive crank and a drive connecting rod. The first end of the drive crank is fixedly connected to the linkage rod, and the second end of the drive crank is hinged to the first end of the drive connecting rod. The second end of the drive connecting rod is hinged to the corresponding connecting rod (i.e., the first crank) of the parallelogram connecting rod assembly. Through the hinged design of the drive crank and the drive connecting rod, the rotational motion of the linkage rod is efficiently converted into the linear motion of the parallelogram connecting rod assembly, improving the flexibility and reliability of the transmission, reducing friction and wear between components, and extending the lifespan of the mechanism.

[0012] To further optimize the connection structure between the drive motor, the linkage, and the crank-connecting rod assembly, and to avoid assembly errors and low transmission efficiency caused by multiple independent connection points, the portion of the drive motor's drive shaft that is fixedly connected to the linkage is also connected to the first end of the transmission crank of the corresponding crank-connecting rod assembly. Directly connecting the drive motor's drive shaft to the linkage and transmission crank simplifies the structure, reduces the number of parts, improves the directness of transmission and overall rigidity, and ensures the synchronization and accuracy of torque transmission.

[0013] To ensure a secure connection between the drive motor output shaft, linkage, and transmission crank, and to prevent slippage or loosening during torque transmission, the first end of the transmission crank has a mounting hole. The drive motor output shaft has a first limiting mating surface along its axial direction. The corresponding end of the linkage has a slot for inserting the drive motor output shaft. The slot defines a second limiting mating surface that abuts and mates with the first limiting mating surface. The insertion of the drive motor output shaft into the slot of the linkage forms a combined mounting shaft portion. This combined mounting shaft portion can pass through the mounting hole of the transmission crank and forms a limiting relationship with the transmission crank in the circumferential direction. Through the abutment and mating of the first and second limiting mating surfaces, and the design of the combined mounting shaft portion, circumferential limiting is achieved, torque is effectively transmitted, connection stability and torsional resistance are improved, and the failure rate is reduced.

[0014] As an improvement, the combined mounting shaft can be inserted through the mounting hole of the drive crank and then fixed to the drive crank by radially arranged fasteners. Using radial fasteners (such as screws or pins) for fixing simplifies assembly, ensures a secure connection, facilitates maintenance and adjustment, and reduces the risk of loosening.

[0015] As an improvement, a third limiting mating surface extending axially is constructed on the outer wall surface of the corresponding end of the linkage rod, and a fourth limiting mating surface that abuts and matches the third limiting mating surface is constructed on the inner wall of the mounting hole at the first end of the transmission crank. Through the abutment and matching of the third and fourth limiting mating surfaces, additional circumferential limiting is achieved, improving transmission accuracy and synchronization, and ensuring consistent motion.

[0016] The "limiting mating surface" in this application can be understood as the surface where two components contact each other, which restricts relative movement through shape matching (such as a plane or a curved surface). For example, a planar limiting mating surface can prevent relative rotation between components and ensure torque transmission.

[0017] To reduce the machining difficulty and cost of the limiting mating surfaces while ensuring mating accuracy, as an improvement, the first, second, third, and fourth limiting mating surfaces are all planar. All limiting mating surfaces adopt a planar design, which facilitates machining and inspection, improves the contact quality and stability of the mating surfaces, and reduces manufacturing costs.

[0018] To facilitate the assembly of the drive motor output shaft and the linkage rod and avoid installation difficulties caused by space constraints, as an improvement, the slot on the linkage rod is an open slot with an opening on the side, the opening of which is opposite to the second limiting mating surface. The side-opening design of the slot on the linkage rod allows the output shaft to be inserted laterally, simplifying the assembly process, improving assembly efficiency, and facilitating on-site maintenance.

[0019] To improve the structural strength of the first end of the drive crank and prevent deformation or breakage under torque, the first end of the drive crank includes two opposing connecting plates and a fixed plate connected between the two connecting plates. Each of the two connecting plates has a mounting hole, through which the combined mounting shaft passes. The design of the two connecting plates and the fixed plate forms a stable frame structure, enhancing the rigidity and torsional resistance of the drive crank, dispersing stress, and improving durability.

[0020] As an improvement, the mounting holes on the two connecting plates extend to positions where they meet the fixed plate, so that corresponding portions of the fixed plate form the fourth limiting mating surface of the mounting holes. Extending the mounting holes to the fixed plate, making the fixed plate directly form the fourth limiting mating surface, increases the mating contact area, simplifies the structure, reduces the number of parts, and improves the reliability and accuracy of the limiting.

[0021] As an improvement, when the movable smoke plate is in the open state of the air inlet, it is located above and in front of the air inlet, and is generally attached to the front side of the air inlet housing. With the movable smoke plate in the open state positioned above and in front of the air inlet and attached to the front side of the air inlet housing, the overall front-to-back depth of the air inlet housing is relatively small, achieving a thin design, maintaining overall aesthetics, and not affecting air intake efficiency.

[0022] As an improvement, the air inlet housing is a flat box structure with a left-right dimension larger than a front-back dimension, and the air inlet is a strip-shaped opening opened in the left-right direction. The flat box structure saves installation space, and the strip-shaped opening extends in the left-right direction, increasing the air intake area and improving the fume extraction efficiency.

[0023] As an improvement, a fume hood is included, comprising a vertically extending air inlet box and a protruding head extending forward from the upper part of the air inlet box. A top suction port is located at the bottom of the protruding head, and a baffle plate is provided at the top suction port, which can be opened and closed by a top plate movement mechanism. By setting the top suction port on the protruding head of the fume hood and controlling it with the baffle plate, a dual air intake method of side suction and top suction is achieved, adapting to different oil fume generation scenarios and improving the overall oil fume extraction performance.

[0024] Compared with existing technologies, this invention has the following advantages: First, by moving the drive motor to an isolated mounting chamber on the left or right side of the air inlet box, it is separated from the main air inlet duct, effectively preventing the drive component from obstructing the core airflow channel, significantly reducing wind resistance and pressure loss, thereby improving the efficiency of fume extraction. Second, the isolation design keeps the drive motor away from the high-temperature fume concentration area, reducing oil adhesion, preventing mechanism jamming and increased motor load, ensuring smooth movement and extending the service life of components. Furthermore, by synchronously driving two parallelogram linkage assemblies through a linkage rod, the smooth translation of the movable smoke plate is achieved, further enhancing the overall reliability and performance stability of the machine. The overall solution maintains a slim design while optimizing the spatial layout, balancing efficient fume extraction with long-term durability. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the movable smoke plate movement mechanism according to an embodiment of the present utility model;

[0026] Figure 2 This is a three-dimensional structural diagram of the movable smoke plate movement mechanism from another angle according to an embodiment of the present utility model;

[0027] Figure 3 This is a three-dimensional structural diagram of a partial component of the movable smoke plate movement mechanism according to an embodiment of the present utility model;

[0028] Figure 4 for Figure 3 An exploded view of some components of the movable smoke plate movement mechanism is shown in the figure;

[0029] Figure 5 for Figure 3 A sectional perspective view of some components of the movable smoke plate movement mechanism shown in the figure;

[0030] Figure 6 This is a three-dimensional structural diagram of the internal structure of the smoke collection hood of the range hood according to an embodiment of the present utility model.

[0031] Figure 7 This is a right view of the range hood according to an embodiment of the present utility model. The right side panel of the smoke collection hood is omitted, and both the smoke baffle and the movable smoke baffle are in the closed state.

[0032] Figure 8 This is a right view of the range hood according to an embodiment of the present invention. The right side panel of the smoke collection hood is omitted, and both the smoke baffle and the movable smoke baffle are in the open state. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0034] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0035] Figures 1-8 A preferred embodiment of the range hood of this utility model is shown. The range hood includes a smoke collection hood 2 and a smoke plate moving mechanism. The smoke collection hood 2 includes a vertically extending air inlet box 21 and a protruding head 22 extending forward from the upper part of the air inlet box 21. The air inlet box 21 is generally a flat box structure with a left-right dimension larger than its front-back dimension, and a strip-shaped air inlet 210 extending in the left-right direction is opened at its front. A top suction port 220 is opened at the bottom of the protruding head 22, and a smoke baffle 23 is provided at the top suction port 220, which can be opened and closed by the top plate moving mechanism, thereby realizing a dual air intake mode of side suction and top suction. The top plate moving mechanism can adopt an existing hinge moving mechanism, which is prior art and will not be described in detail here.

[0036] A movable smoke plate 212 is provided at the air inlet 210 of the air inlet housing 21. Driven by a smoke plate movement mechanism, the movable smoke plate 212 can move relative to the air inlet housing 21 in a translational manner, thereby opening and closing the air inlet 210. The smoke plate movement mechanism includes a drive motor 32, two parallelogram connecting rod assemblies, two crank connecting rod assemblies, and a linkage rod 27. The two parallelogram connecting rod assemblies are arranged at intervals along the left-right direction. The movable smoke plate 212 is connected to the free ends of the two parallelogram connecting rod assemblies, thus ensuring that the movable smoke plate 212 maintains a vertical posture during movement through the movement of the parallelogram connecting rod assemblies, achieving translational motion.

[0037] The linkage rod 27 is rotatably mounted on the air inlet housing 21, allowing it to rotate around its own axis. The linkage rod 27 is connected to both parallelogram-shaped connecting rod assemblies via corresponding crank-connecting rod assemblies. Specifically, each crank-connecting rod assembly includes a transmission crank 261 and a transmission connecting rod 262. The first end of the transmission crank 261 is fixedly connected to the linkage rod 27, and the second end of the transmission crank 261 is hinged to the first end of the transmission connecting rod 262. The second end of the transmission connecting rod 262 is hinged to the corresponding connecting rod of the parallelogram-shaped connecting rod assembly (i.e., the first crank 251). Rotation of the linkage rod 27 causes the transmission crank 261 to swing, which in turn drives the parallelogram-shaped connecting rod assembly to move via the transmission connecting rod 262, ultimately causing the movable smoke plate 212 to translate.

[0038] To optimize airflow and prevent oil contamination, a mounting plate 31 is installed inside the air inlet housing 21 near its left side (or right side). The mounting plate 31 and the corresponding wall panel (such as the left side panel) of the air inlet housing 21 define a mounting chamber isolated from the air inlet duct of the air inlet housing 21. A drive motor 32 is located within the mounting chamber and fixed relative to the mounting plate 31. The output shaft 321 of the drive motor 32 is connected to the left end of the linkage rod 27 and drives the linkage rod 27 to rotate. By placing the drive motor 32 within the isolated mounting chamber, it is isolated from the main air inlet duct, effectively preventing obstruction of the core airflow channel, reducing wind resistance and pressure loss, and minimizing high-temperature oil contamination, thus ensuring smooth operation and component lifespan.

[0039] The front of the air inlet housing 21, corresponding to the wall panel above the air inlet 210, is a fixed panel 211. With the air inlet 210 open (accessible via the movable smoke plate 212), the movable smoke plate 212 is positioned above and in front of the air inlet 210, and is generally abutted against the lower front side of the fixed panel 211 of the air inlet housing 21. A panel bracket 2121 is provided on the back of the movable panel 212 near its lower edge. The panel bracket 2121 itself forms an upper open U-shaped relief groove 2120 (i.e., the panel bracket 2121 has a groove structure), and the bottom edge of the fixed panel 211 is embedded in this groove. With the air inlet 210 open (accessible via the movable panel 212), the movable panel 212 is located in front of the fixed panel 211 and parallel to it, with at least the bottom edge of the fixed panel 211 embedded in the relief groove 2120. This design allows the movable panel 212 to move as high as possible, increasing the opening area of ​​the side air inlet 210, while ensuring that the movable panel 212 and the fixed panel 211 fit tightly together, reducing the front and rear dimensions of the overall structure and meeting the requirements of ultra-thin design.

[0040] See Figure 1 and Figure 2 In this embodiment, there are two mounting plates 31 arranged at a left-right interval, which are respectively located adjacent to the left and right sides of the air inlet box 21. The two ends of the linkage rod 27 are rotatably supported on the two mounting plates, thereby enhancing the rigidity and stability of the linkage rod 27, ensuring smooth rotation, and reducing movement deviation and wear.

[0041] The two parallelogram connecting rod assemblies and the two crank connecting rod assemblies are each positioned adjacent to one of the two mounting plates. Specifically, the left-side parallelogram connecting rod assembly and crank connecting rod assembly are positioned adjacent to the left-side mounting plate, while the right-side parallelogram connecting rod assembly and crank connecting rod assembly are positioned adjacent to the right-side mounting plate. This symmetrical arrangement ensures uniform force distribution, guarantees synchronous left-right translation of the movable smoke plate 212, improves motion accuracy, and avoids obstructing the main air duct space of the air inlet box 21.

[0042] The drive motor 32 can be installed in the mounting chamber on the left or right side. For example, the drive motor 32 is installed in the left mounting chamber, and its output shaft 321 is connected to the left end of the linkage 27. The output shaft 321 of the drive motor 32, the linkage 27, and the transmission crank 261 on the left side are connected by a limiting fit structure to ensure the synchronicity and accuracy of torque transmission.

[0043] See Figures 3-5 Specifically, the first end of the transmission crank 261 has a mounting hole 2610. The output shaft 321 of the drive motor 32 has a first limiting mating surface 3211 arranged along its axial direction (for example, the cross-section of the output shaft 321 is D-shaped, and its planar portion constitutes the first limiting mating surface 3211). The corresponding end of the linkage 27 has a slot 270 for the output shaft 321 of the drive motor 32 to be inserted therein, and the slot 270 defines a second limiting mating surface 271 that abuts and fits against the first limiting mating surface 3211 (for example, the slot 270 is a D-shaped slot, and its planar portion constitutes the second limiting mating surface 271). After the output shaft 321 of the drive motor 32 is inserted into the slot 270 of the linkage 27, a combined mounting shaft portion is formed. This combined mounting shaft portion passes through the mounting hole 2610 of the transmission crank 261 and forms a limit with the transmission crank 261 in the circumferential direction of the combined mounting shaft portion.

[0044] Furthermore, after the combined mounting shaft passes through the mounting hole 2610 of the transmission crank 261, the combined mounting shaft is fixed to the transmission crank 261 by radially arranged fasteners (such as screws or pins) to ensure a firm connection.

[0045] Furthermore, a third limiting mating surface 272 extending axially is formed on the outer wall surface of the corresponding end of the linkage 27 (for example, the outer wall of the end of the linkage 27 is D-shaped, and its planar portion constitutes the third limiting mating surface 272). A fourth limiting mating surface 2613 is formed on the inner wall of the mounting hole 2610 at the first end of the transmission crank 261, which abuts and fits against the third limiting mating surface 272 (for example, the mounting hole 2610 is a D-shaped hole, and its planar portion constitutes the fourth limiting mating surface 2613). Through the mutual abutment and fit of the first limiting mating surface 3211, the second limiting mating surface 271, the third limiting mating surface 272, and the fourth limiting mating surface 2613, circumferential limiting is achieved, torque is effectively transmitted, and slippage and loosening caused by misalignment or unbalanced force during assembly are prevented.

[0046] In this embodiment, the first limiting mating surface 3211, the second limiting mating surface 271, the third limiting mating surface 272 and the fourth limiting mating surface 2613 are all planes, which are easy to process and fit, and reduce costs.

[0047] See also Figure 3 and Figure 4 In this embodiment, the first end of the transmission crank 261 includes two opposing connecting wall plates 2611 and a fixed wall plate 2612 connected between the two connecting wall plates 2611, forming a stable frame structure. Each of the two connecting wall plates 2611 has mounting holes 2610. The assembled mounting shaft (consisting of the output shaft 321 of the drive motor 32 and the end of the linkage rod 27) passes through the two mounting holes 2610, thereby enhancing the rigidity and torsional resistance of the transmission crank 261.

[0048] The mounting holes 2610 on the two connecting wall plates 2611 extend to the position where they meet the fixed wall plate 2612, so that the corresponding part of the fixed wall plate 2612 constitutes the fourth limiting mating surface 2613 of the mounting holes 2610. This design increases the mating contact area, simplifies the structure, and improves the reliability and accuracy of the limiting.

[0049] The slot 270 on the linkage 27 is an open slot with an opening on the side, and the opening of the open slot is opposite to the second limiting mating surface 271. This allows the output shaft 321 of the drive motor 32 to be inserted laterally into the slot 270 of the linkage 27, simplifying the assembly process, improving assembly efficiency, and facilitating maintenance.

[0050] The part of the output shaft 321 of the drive motor 32 that is fixedly connected to the linkage rod 27 is also connected to the first end of the transmission crank 261 of the corresponding crank-connecting rod assembly. That is, the output shaft 321 of the drive motor 32 directly drives the linkage rod 27 and the transmission crank 261 simultaneously, which simplifies the structure and improves the directness of transmission and overall rigidity.

[0051] Each parallelogram linkage mechanism 25 includes two parallel first cranks 251. The first ends of the two first cranks 251 are hinged to the air inlet box 21 (specifically, the mounting plate 31 inside the air inlet box). The second ends of the two first cranks 251 are hinged to a connecting frame 252, which is fixedly connected to the panel bracket 2121 on the back of the movable panel 212.

[0052] In this embodiment, the driving force transmission path of the smoke plate motion mechanism is as follows: the torque of the output shaft 321 of the drive motor 32 is first transmitted to the linkage 27, and then transmitted through the linkage 27 to the transmission cranks 261 on both sides of the external connection. This transmission method can prevent the transmission cranks 261 on the driving side from deforming under force, causing the non-driving side to lag in motion, and ensure motion synchronization.

[0053] The output shaft 321 of the drive motor 32, the linkage 27, and the transmission crank 261 are connected by a multi-sided limiting fit to prevent misalignment, increased internal rotational resistance, and reduced torque output caused by single-plane limiting or screw-based limiting during assembly. The connection between the transmission crank 261 and the linkage 27 is fixed by a three-sided limiting method through the shaft on both sides, which controls the clearance of the shaft hole and effectively prevents crank offset from increasing frictional resistance under unbalanced installation or force conditions, and also prevents the risk of the fixing screws loosening due to crank slippage under force.

[0054] Overall, this utility model of a range hood effectively avoids obstruction of the core airflow channel by moving the drive motor 32 to an isolated mounting chamber on the side of the air inlet box 21, thus separating it from the main air inlet duct. This significantly reduces wind resistance and pressure loss, and improves smoke extraction efficiency. Simultaneously, the isolation design keeps the drive motor 32 away from areas of concentrated high-temperature smoke, reducing oil adhesion, preventing mechanism jamming and increased motor load, ensuring smooth operation, and extending component lifespan. The synchronous drive of two parallelogram linkage assemblies via the linkage rod 27 achieves smooth translation of the movable smoke plate 212, enhancing the overall reliability and performance stability of the machine.

Claims

1. A range hood, comprising an air inlet box (21) and a smoke plate moving mechanism, wherein an air inlet (210) is provided at the front of the air inlet box (210), and a movable smoke plate (212) is provided at the air inlet (210). The movable smoke plate (212) can move relative to the air inlet box (21) in a translational manner under the drive of the smoke plate moving mechanism, thereby opening and closing the air inlet (210); Its features are: The smoke plate motion mechanism includes a drive motor (32), two parallelogram connecting rod assemblies, two crank connecting rod assemblies, and a linkage rod (27). The two parallelogram connecting rod assemblies are arranged at intervals in the left-right direction. The movable smoke plate (212) is connected to the free ends of the two parallelogram connecting rod assemblies. The linkage rod (27) is rotatably mounted on the air inlet box (21) in a manner that allows it to rotate around its own axis. The linkage rod (27) is connected to the two parallelogram connecting rod assemblies through corresponding crank connecting rod assemblies. An installation bracket (31) is provided inside the housing (21) on the left or right side adjacent to the air inlet housing (21). The installation bracket (31) and the corresponding wall panel of the air inlet housing (21) define an installation chamber that is isolated from the air inlet duct of the air inlet housing (21). The drive motor (32) is located in the installation chamber and fixed relative to the installation bracket (31). The output shaft (321) of the drive motor (32) is connected to one end of the linkage rod (27) and drives the linkage rod (27) to rotate.

2. The range hood according to claim 1, characterized in that: There are two mounting brackets (31) arranged at a left-right interval. The two mounting brackets (31) are respectively located near the left and right sides of the air inlet box (21). The two ends of the linkage rod (27) are rotatably supported on the two mounting brackets.

3. The range hood according to claim 2, characterized in that: The two parallelogram connecting rod assemblies and the two crank connecting rod assemblies are respectively disposed adjacent to the two mounting plates (31).

4. The range hood according to any one of claims 1 to 3, characterized in that: The crank-connecting rod assembly includes a transmission crank (261) and a transmission connecting rod (262). The first end of the transmission crank (261) is fixedly connected to the linkage rod (27). The second end of the transmission crank (261) is hinged to the first end of the transmission connecting rod (262). The second end of the transmission connecting rod (262) is hinged to the corresponding connecting rod of the parallelogram connecting rod assembly.

5. The range hood according to claim 4, characterized in that: The part of the drive shaft of the drive motor (32) that is fixedly connected to the linkage rod (27) is also connected to the first end of the transmission crank (261) of the corresponding crank-connecting rod assembly.

6. The range hood according to claim 5, characterized in that: The first end of the transmission crank (261) is provided with a mounting hole (2610). The output shaft (321) of the drive motor (32) has a first limiting mating surface (3211) arranged along its axial direction. The corresponding end of the linkage rod (27) has a slot (270) for the output shaft (321) of the drive motor (32) to be inserted therein. The slot (270) defines a second limiting mating surface (271) that is abutted and adapted to the first limiting mating surface (3211). When the output shaft (321) of the drive motor (32) is inserted into the slot (270) of the linkage rod (27), a combined mounting shaft is formed. The combined mounting shaft can pass through the mounting hole (2610) of the transmission crank (261) and form a limit with the transmission crank (261) in the circumferential direction of the combined mounting shaft.

7. The range hood according to claim 6, characterized in that: The combined mounting shaft can be inserted through the mounting hole (2610) of the transmission crank (261) and then fixed to the transmission crank (261) by radially arranged fasteners.

8. The range hood according to claim 6, characterized in that: A third limiting mating surface (272) extending axially is formed on the outer wall surface of the corresponding end of the linkage rod (27), and a fourth limiting mating surface (2613) that abuts and matches the third limiting mating surface (272) is formed on the inner wall of the first end mounting hole (2610) of the transmission crank (261).

9. The range hood according to claim 8, characterized in that: The first limiting mating surface (3211), the second limiting mating surface (271), the third limiting mating surface (272) and the fourth limiting mating surface (2613) are all planes.

10. The range hood according to claim 8, characterized in that: The slot (270) on the linkage rod (27) is an open slot with an opening on the side, and the opening of the open slot is opposite to the second limiting mating surface (271).

11. The range hood according to claim 8, characterized in that: The first end of the transmission crank (261) includes two oppositely arranged connecting wall plates (2611) and a fixed wall plate (2612) connected between the two connecting wall plates (2611). The two connecting wall plates (2611) are provided with the mounting channels (2610), and the combined mounting shaft passes through the two mounting channels (2610).

12. The range hood according to claim 11, characterized in that: The mounting holes (2610) on the two connecting wall panels (2611) extend to a position where they meet the fixed wall panel (2612), such that the corresponding portion of the fixed wall panel (2612) constitutes the fourth limiting mating surface (2613) of the mounting holes (2610).

13. The range hood according to any one of claims 1 to 3, characterized in that: When the movable smoke plate (212) opens the air inlet (210), the movable smoke plate (212) is located above and in front of the air inlet (210) and is generally attached to the front side of the air inlet box (21).

14. The range hood according to any one of claims 1 to 3, characterized in that: The air inlet box (21) is a flat box structure with the left and right dimensions larger than the front and back dimensions, and the air inlet (210) is a strip-shaped opening opened in the left and right direction.

15. The range hood according to claim 14, characterized in that: The system includes a smoke hood (2), which includes a vertically extending air inlet box (21) and a protruding head (22) extending forward from the upper part of the air inlet box (21). The bottom of the protruding head (22) is provided with a top air intake (220), and a smoke baffle (23) is provided at the top air intake (220) that can be opened and closed by a top plate moving mechanism.

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