Lifting type range hood

Abstract

The invention discloses a lifting type range hood, and belongs to the technical field of kitchen appliances. The technical problem that when an existing lifting type range hood works, lampblack pollutes the inner wall of a fixed box, and consequently cleaning is difficult is solved. The device comprises a fan box body, a fixed box body, a turnover connecting box body and a lifting smoke collecting box body. The fan box body is provided with a smoke exhaust assembly and a first opening window; the fixed box body is positioned behind and accommodates the turnover connecting box body; the turnover connecting box body can rotate relative to the fixed box body and is provided with a second opening window opposite to the first opening window, and the turnover connecting box body can be in butt joint with the first opening window during working; the lifting smoke collecting box body penetrates through a lifting opening in the bottom of the fixed box body and can ascend and descend. According to the scheme, the inner cavities of the three box bodies are sequentially communicated to form the air inlet channel, the oil smoke path is limited in the channel, the box bodies are effectively isolated and fixed, the interior of the box bodies is prevented from being polluted by oil stains, the convenience of cleaning and maintenance is greatly improved, and meanwhile compact storage in a non-working state is achieved.

Description

Technical Field

[0001] This invention relates to the field of range hoods, and more particularly to a lift-type range hood. Background Technology

[0002] Lift-type range hoods are widely popular because they can be raised and lowered vertically, hiding inside cabinets when not in use, thus saving space and maintaining the overall aesthetics of the kitchen. Their typical structure usually includes a fan housing, a fixed housing, and a liftable smoke collection housing.

[0003] Currently, these types of range hoods face a long-standing technical problem that has not been properly resolved: when the smoke collection box descends, the sucked-in fumes directly enter the fan housing through the internal cavity of the fixed box. During this process, the high-temperature fumes come into contact with the inner wall of the fixed box, quickly condensing into oil. This oil flows down from the gap between the inside of the fixed box and the outside of the rising smoke collection chamber, leaving oil stains on the outer surface of the smoke collection chamber, and may even drip onto the stove and countertop. Grease from the inside of the fixed box also sticks to the outer surface of the smoke collection box during its rising and falling process, making it dirty and unhygienic.

[0004] Therefore, there is an urgent need in this field for an innovative structural design that can effectively prevent oil fumes from entering the fixed enclosure and fundamentally solve the problem of its inner wall being contaminated by oil. Summary of the Invention

[0005] The technical problem to be solved and the technical task proposed by this invention is to improve and refine existing technical solutions, and to provide a lift-up range hood to avoid oil stains from contaminating the inner wall of the fixed housing and to achieve compact storage. To this end, this invention adopts the following technical solution.

[0006] A liftable range hood includes a fan housing, a fixed housing, a flip-up connecting housing, and a liftable smoke collection housing; The fan housing is equipped with a smoke exhaust assembly, and a first opening window is opened on the housing. The fixed housing is located behind the fan housing, and the flip-connecting housing is housed inside it; The flip-connecting box can rotate relative to the fixed box. It is provided with a second opening window opposite to the first opening window. When the flip-connecting box rotates forward to the working position, its second opening window can be connected with the first opening window of the fan box, so that the oil fumes entering the flip-connecting box can enter the fan box through the second opening window and the first opening window. The bottom of the fixed box is provided with a lifting port, and the lifting smoke collection box passes through the lifting port and can move up and down relative to the fixed box through a drive mechanism; The inner cavity of the lifting smoke collection box, the inner cavity of the flip-connecting box, and the inner cavity of the fan box are connected in sequence to form an air intake channel.

[0007] This technical solution resolves the conflict between space saving and effective smoke extraction through the coordinated action of the lifting smoke collection box and the flip-connecting box. Furthermore, by constructing a rigid air intake channel isolated from the fixed outer shell, it fundamentally improves the ease of cleaning and maintenance. Specifically, the lifting smoke collection box is designed to be retractable and concealed when not in operation, effectively reducing the space occupied by the range hood in the kitchen and maintaining the overall aesthetics and openness of the kitchen. The flip-connecting box is housed within the fixed box, allowing the entire air duct system to be compactly integrated in the retracted state, resulting in a rational structural layout. During operation, the lifting smoke collection box descends, and the flip-connecting box rotates forward to connect with the fan housing. This creates a relatively closed air intake channel connecting the three chambers from the air inlet to the exhaust assembly, confining the path of the fumes during operation within the continuous chamber formed by the lifting smoke collection box, the flip-connecting box, and the fan housing. This fundamentally prevents high-temperature fumes from contacting the inner wall of the fixed housing, eliminating the root cause of condensation, accumulation, and downward flow of oil stains on the inner wall of the fixed housing. Because the fumes are completely isolated within the air intake duct, the condensed grease primarily adheres to the inner wall of the lifting fume collection box, the inner wall of the flip-connecting box, and the fan housing, and is ultimately guided into the grease collection box. This prevents grease from flowing out through the gap between the fixed box and the lifting fume collection box, thus contaminating the outer surface of the lifting fume collection box. It also fundamentally prevents grease from dripping onto the stove and countertop, ensuring the cleanliness of the equipment exterior and the kitchen environment. The flip-connecting box effectively avoids interference between the lifting fume collection box and its movement, ensuring the lifting fume collection box has sufficient lifting space, thereby balancing space saving and effective fume extraction.

[0008] As a preferred technical means: the middle part of the back plate of the fan box protrudes obliquely to the rear and downward, and the protrusion is provided with the first opening window.

[0009] The middle section of the fan housing back panel bulges downwards and backwards, forming a slope that matches the flip angle. This allows the front panel of the flip-connecting housing, equipped with a second opening window, to fit snugly against the slope formed by the bulge on the fan housing back panel after flipping, achieving a larger surface contact area and forming a better sealing barrier. This reduces the risk of oil fumes leaking from the joint and allows the fumes to be smoothly introduced into the fan housing. When the two planes are in contact, the force on the flip-connecting housing can be evenly transferred to the fan housing back panel, avoiding stress concentration at points or lines. This enhances the structural rigidity and overall stability of the joint, helping to reduce vibration and abnormal noise during operation. Furthermore, compared to a flat back panel, the back panel structure with a specific angled bulge has higher mechanical strength and rigidity.

[0010] As a preferred technical means: the first opening window is provided with a rearward first flange, and the second opening window is provided with a forward second flange. The first opening window is larger than the second opening window, and the axial length of the second flange is greater than that of the first flange. When the flip-connecting box is flipped to the working position, the second flange is inserted into the first opening window surrounded by the first flange, so that the two are connected.

[0011] The second flange inserts into the first opening window formed by the first flange, creating a labyrinthine sealed channel. When oil condenses on the outer wall of the second flange and flows downwards, because the second flange is inserted, the oil droplets will drip directly back into the lower smoke collection chamber or fan chamber, and cannot bypass the long gap between the second and first flanges to enter and contaminate the interior of the fixed housing. This physically blocks the main path of oil leakage. In addition, the insertion of the second flange into the first opening window formed by the first flange is equivalent to adding a sleeve-like reinforcing structure at the joint, which helps to improve the ability of the connection point to resist lateral or torsional loads caused by airflow pulsation and machine vibration, making the entire air intake channel more stable in operation and effectively reducing abnormal noise.

[0012] As a preferred technical means: the cross-sectional dimensions of the flip-connecting box, the lifting smoke collection box, and the fixed box increase sequentially, and when the lifting smoke collection box is in a retracted state, the three form a nested structure from the outside to the inside.

[0013] When the range hood is not in operation, the flip-up connecting housing is fully embedded in the lifting smoke collection box, allowing all grease and grime adhering to the flip-up connecting housing to flow into the lifting smoke collection box, keeping its outer surface clean. The three housings share the same vertical space when retracted, achieving a high degree of integration in three dimensions. This minimizes the cabinet space occupied by the range hood when not in use, achieving minimal structural storage and meeting the modern kitchen's pursuit of simplicity and space utilization. The nested structure allows the entire lifting system to form a cohesive and aesthetically pleasing module when retracted. As a preferred technical means, the upper part of the flip-connecting box is trapezoidal with a smaller top and a larger bottom. The upper part adopts a shape that is smaller at the top and larger at the bottom. The smaller upper part achieves dual optimization: on the one hand, it makes room for the drive mechanism, and on the other hand, it increases the distance from the inner wall of the fixed box, providing sufficient space for the flipping action. While ensuring airflow connectivity, the three boxes can form a tight nest when retracted, minimizing unnecessary internal space waste and achieving a compact design.

[0014] As a preferred technical means: a linkage mechanism is provided between the flip-connecting box and the lifting smoke collection box; when the lifting smoke collection box descends to the set position, the flip-connecting box is driven to rotate through the linkage mechanism.

[0015] This technical solution organically integrates two independent actions, not only reducing costs and simplifying control, but also ensuring the accuracy and reliability of the action sequence from a physical perspective. Through a linkage mechanism, this solution requires only one drive mechanism to operate the lifting and lowering of the smoke collection box. The rotation of the flipping connecting box is automatically triggered via mechanical linkage, eliminating the need for a separate drive motor, sensor, and corresponding control circuit for the flipping action. This simplifies the electrical control system and reduces hardware costs and overall machine complexity. The linkage mechanism mechanically couples the two actions in time and space, ensuring that the flipping connecting box only begins to flip after the lifting and lowering smoke collection box has descended to a safe, set position. This avoids interference in component movement that may be caused by electronic control delays or errors, guaranteeing the reliable execution of the lifting and flipping sequence. This mechanical power transmission method, compared to installing a separate drive unit for the flipping action, significantly saves valuable internal space, creating conditions for the layout of other components or achieving a more compact nested structure.

[0016] As a preferred technical means: the linkage mechanism includes guide posts on the left and right sides of the flip-connecting box, vertical guide grooves on the left and right sides of the lifting smoke collection box, a first limiting member on the left and right sides of the upper part of the flip-connecting box and with oblique guide grooves, and a second limiting member fixed to both sides of the fixed box and with limiting posts. The guide post is slidably disposed within the vertical guide groove; The limiting post is embedded in the inclined guide groove of the first limiting member; When the lifting smoke collection box descends to the point where the guide column abuts against the upper edge of the vertical guide groove, the cooperation between the vertical guide groove and the guide column causes the flip-connecting box to descend synchronously. During this process, the limiting column slides relative to the inclined guide groove, thereby guiding the flip-connecting box to flip forward relative to the fixed box.

[0017] This technical solution uses a mechanical hard limit by having the guide column abut against the upper edge of the vertical guide groove to set the trigger point for the action. This ensures that the lifting smoke collection box must complete the first half of its descent independently before driving the flipping connecting box to move. This purely mechanical timing control fundamentally eliminates structural interference that may occur when the two boxes move simultaneously in the retracted state, resulting in high reliability. Utilizing the relative movement between the fixed limit column and the inclined guide groove that descends with the box, when the flipping connecting box is forced to descend, the interaction between the inclined guide groove and the limit column converts the vertical downward linear motion of the box into a set of forward rotational motions at a predetermined angle. The motion conversion is smooth and reliable, and the flipping angle is uniquely determined by the shape of the inclined groove, ensuring high repeatability. The entire linkage mechanism (guide column, vertical guide groove, limit components, etc.) is mainly distributed on the sides or in the internal gaps of each box, without requiring additional space in the large air duct, maximizing functional integration and making a key contribution to the compact design of the overall structure. The guide column-vertical guide groove mating pair not only transmits motion but also constitutes a good guiding and load-bearing structure. It can effectively withstand the overturning moment brought by the flip connection box, ensuring that it remains stable during descent and flipping, reducing shaking and abnormal noise.

[0018] As a preferred technical means, an elastic element is provided between the first limiting member and the second limiting member to restrict the downward movement of the flip-connecting box.

[0019] When the linkage mechanism is triggered and the flip-connecting housing begins to move downwards, the elastic element is further stretched from its initial stretched state, generating a gradually increasing upward pulling force. This force interacts with the downward pulling force of the drive mechanism, forming a buffer that makes the entire action start more smoothly and gently. In the non-working state, the elastic element is in a pre-stretched state, and its continuous contraction and rebound force pulls the flip-connecting housing upwards, reliably holding it in a retracted position relatively fixed to the fixed housing. This effectively prevents the housing from sagging or accidentally shifting due to gravity, vibration, etc., ensuring the structural stability and neatness in the standby state. When the work is finished, the lifting smoke collection housing rises and releases the downward pulling force on the flip-connecting housing. The potential energy stored in the greatly stretched elastic element is released, generating an upward restoring force that pulls the flip-connecting housing back to its initial retracted position, ensuring the absolute reliability and high efficiency of the reset action without relying on other power sources.

[0020] As a preferred technical means, the second limiting member is provided with an upper limit switch and a lower limit switch.

[0021] By setting upper and lower limit switches, electrical endpoints are defined for the movement range of the flip-up connecting housing. When the housing flips to its final position or resets, the limit switches are triggered, instantly cutting off the power to the drive motor or reversing it. This provides double protection, fundamentally preventing motor overload, mechanism jamming, or component damage due to mechanical failure or control malfunction, greatly improving system safety and reliability. The trigger signal from the limit switches can be transmitted as an electrical signal to the control unit, thereby determining whether the flip-up connecting housing is in an unfolded or retracted working state. This provides a reliable prerequisite for achieving more complex intelligent control (such as interlocking with the lifting smoke collection box, lighting control, and automatic fan speed adjustment), enhancing the product's automation level and user experience.

[0022] As a preferred technical means: the inner cavity of the fan housing is provided with the aforementioned drive mechanism, which includes a motor, a reducer, a driving bevel gear, a driven bevel gear, a vertically arranged lead screw and a nut; The motor, reducer, driving bevel gear, and driven bevel gear are all arranged in the upper space of the fan housing; the output shaft of the reducer is arranged horizontally, and a driving bevel gear is set at each end of the horizontal output shaft of the reducer; two vertical lead screws are symmetrically arranged on the left and right sides of the lifting smoke collection box; the upper end of each lead screw meshes with the corresponding driving bevel gear through a driven bevel gear; The motor drives the active bevel gear to rotate through the reducer, which in turn drives the driven bevel gear meshing with it to rotate, thereby driving the lead screw to rotate; the nut that cooperates with the lead screw is fixedly connected to the lifting smoke collection box or a component connected to it, thereby converting the rotational motion of the lead screw into the linear lifting motion of the lifting smoke collection box.

[0023] The organic combination of the lead screw and nut pair and the bevel gear pair forms a smooth, precise, compact, low-noise, and reliable drive system, providing reliable and high-performance power execution for this lifting range hood.

[0024] Beneficial effects: 1. By setting up a flip-type connecting box, which connects with the fan box during operation, the inner cavities of the lifting smoke collection box, the flip-type connecting box, and the fan box together form a closed and continuous air intake channel. This strictly restricts the flow path of oil fumes within this channel, fundamentally eliminating the contact between high-temperature oil fumes and the inner wall of the fixed box. This completely eliminates the root cause of oil stains condensing, accumulating, and flowing down the inner side of the fixed box.

[0025] 2. Because the fumes are completely isolated within the air intake duct, the condensed oil will only exist in the lifting smoke collection box, the flip-connecting box, and the fan box, and will eventually be guided into the oil collection box. This prevents oil stains from flowing out from the gap between the fixed box and the lifting smoke collection box along the inner wall of the fixed box, thus contaminating the outer surface of the lifting smoke collection box. It also fundamentally prevents oil stains from dripping onto the stove and countertop, ensuring the cleanliness of the exterior of the range hood and the kitchen environment, and reducing the cleaning burden.

[0026] 3. The flip-up connecting box creates vertical space for the lifting and lowering of the smoke collection box by flipping, thus fundamentally avoiding interference between the two during movement. This ensures that the lifting and lowering smoke collection box can descend to the effective smoking height when in operation, and can retract to its minimum volume together with the flip-up connecting box when not in operation, thus balancing the two major needs of low-level efficient smoking and high-level compact storage. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure from one viewpoint of the present invention.

[0028] Figure 2 This is a schematic diagram of another view of the structure of the present invention.

[0029] Figure 3 This is a schematic cross-sectional view of the structure in the contracted state of the present invention.

[0030] Figure 4 This is a cross-sectional structural diagram of the present invention in its working state.

[0031] Figure 5 yes Figure 4 Enlarged view of part A.

[0032] Figure 6 This is a schematic diagram of the structure of the present invention after removing the fixed back panel of the box.

[0033] Figure 7 This is a schematic diagram of the blasting structure of the present invention.

[0034] Figure 8 yes Figure 7 Enlarged view of part B.

[0035] In the diagram: 1. Fan housing; 11. First opening window; 111. First flange; 12. Guide slope; 2. Fixed housing; 21. Lifting port; 3. Flip-connecting housing; 31. Second opening window; 311. Second flange; 32. Front panel of flip-connecting housing; 4. Lifting smoke collection housing; 5. Drive mechanism; 51. Motor; 52. Reducer; 53. Driving bevel gear; 54. Driven bevel gear; 6. Linkage mechanism; 61. Guide post; 62. Vertical guide groove; 63. First limiting component; 631. Angled guide groove; 64. Second limiting component; 641. Limiting post; 65. Upper limit switch; 66. Lower limit switch. Detailed Implementation

[0036] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] 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 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. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration 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.

[0038] Example 1: like Figure 1-5 As shown in the figure, this embodiment provides a lift-up range hood.

[0039] The lift-type range hood includes a fan housing 1, a fixed housing 2, a flip-connecting housing 3, and a lift-type smoke collection housing 4.

[0040] The fan housing 1 is the power core of the range hood and is usually fixedly installed inside a kitchen cabinet. It houses conventional smoke extraction components, such as a centrifugal fan and a volute. In this embodiment, the back panel of the fan housing 1 has a first opening window 11.

[0041] The fixed housing 2 is located behind the fan housing 1 and is fixedly connected to it. The interior of the fixed housing 2 is a hollow receiving cavity, and a lifting port 21 is opened at the bottom.

[0042] The flip-up connecting box 3 is housed inside the fixed box 2. The flip-up connecting box 3 is rotatably connected to the fixed box 2, allowing it to flip forward (i.e., towards the kitchen stove). A second opening window 31 is provided on its box, corresponding to the position of the first opening window 11.

[0043] The lifting smoke collection box 4 passes through the lifting port 21 at the bottom of the fixed box 2. The lifting smoke collection box 4 is connected to a drive mechanism 5, and can move vertically up and down relative to the fixed box 2 under the drive of the drive mechanism 5.

[0044] The working process and principle of this embodiment are as follows: When the range hood needs to operate, the drive mechanism 5 is activated, driving the lifting smoke collection box 4 to extend downward from the fixed box 2. Simultaneously, or at a certain time sequence, the flip-connecting box 3 rotates forward relative to the fixed box 2 until it reaches the working position. In the working position, the second opening window 31 of the flip-connecting box 3 aligns with the first opening window 11 of the fan box 1.

[0045] At this time, the inner cavity of the lifting smoke collection box 4, the inner cavity of the flip-connecting box 3, and the inner cavity of the fan box 1 are connected in sequence to form a complete air intake channel. Under the negative pressure generated by the fan, the fumes are drawn in from the air inlet of the lifting smoke collection box 4, flow through the inner cavity of the lifting smoke collection box 4 and the inner cavity of the flip-connecting box 3 in sequence, and finally enter the fan box 1 through the second opening window 31 and the first opening window 11, and are finally discharged outdoors.

[0046] When the range hood stops working, the drive mechanism 5 moves in the opposite direction, the lifting smoke collection box 4 retracts upward into the fixed box 2, and the flip-connecting box 3 flips backward to reset, returning to its initial compact state.

[0047] This embodiment constructs a dynamically expandable and retractable air intake channel through a specific combination and movement of four boxes. While ensuring the fume extraction effect, it also enables compact storage of the equipment when not in use, saving kitchen space and preventing oil stains from contaminating the inner wall of the fixed box 2, thus reducing the burden of cleaning.

[0048] Example 2: Similarities to Embodiment 1 will not be repeated here. The difference is that, in order to reduce costs and simplify control, a linkage mechanism 6 is provided between the flip-connecting box 3 and the lifting smoke collection box 4.

[0049] like Figure 6 As shown, the linkage mechanism 6 specifically includes: Guide post 61: Fixedly installed on the left and right side walls of the flip-connecting box 3.

[0050] Vertical guide groove 62: It is opened on the left and right side walls of the lifting smoke collection box 4, and the guide post 61 is slidably embedded in the vertical guide groove 62.

[0051] First limiting component 63: fixed on the upper left and right sides of the flip-connecting box 3, with an oblique guide groove 631 machined on it.

[0052] The second limiting member 64 is fixed to the left and right side walls of the fixed housing 2, and a limiting post 641 is provided on it. The limiting post 641 is embedded in the inclined guide groove 631 of the aforementioned first limiting member 63.

[0053] The work process is as follows: As the lifting smoke collection box 4 descends, the guide column 61 first slides freely within the vertical guide groove 62. When the lifting smoke collection box 4 descends to the set position, that is, when the guide column 61 abuts against the upper edge of the vertical guide groove 62, the linkage mechanism 6 is triggered. The continuing to descend lifting smoke collection box 4 pushes the guide column 61 through the upper edge of the vertical guide groove 62, thereby causing the flip-connecting box 3 to descend synchronously.

[0054] During the forced descent of the flip-connecting housing 3, since the limiting post 641 on the fixed housing 2 is stationary, it will slide relative to the inclined guide groove 631 of the first limiting member 63. The interaction between the inclined surface of the inclined guide groove 631 and the limiting post 641 guides the flip-connecting housing 3 to flip forward relative to the fixed housing 2, ultimately achieving docking with the fan housing 1.

[0055] This linkage mechanism 6 ensures that the lifting smoke collection box 4 descends independently for a certain distance before driving the flipping connecting box 3 to flip, avoiding motion interference and ensuring reliable action timing.

[0056] Example 3: Based on Embodiment 1 or 2, this embodiment further optimizes the structure of the first opening window 11 of the fan housing 1 and the second opening window 31 of the flip-connected housing 3 to achieve a better oil stain leakage prevention effect.

[0057] like Figure 7 As shown, the middle part of the back plate of the fan housing 1 is designed to bulge downwards and backwards, forming a guide slope 12. The first opening window 11 is located on this bulging guide slope 12.

[0058] The tilt angle of the guide slope 12 matches the angle when the flip-connecting box 3 is flipped to the working position. Since the first opening window 11 is set on the raised slope, when the flip-connecting box 3 is flipped into place, the front plate 32 of the flip-connecting box where the second opening window 31 is located can achieve a large area of ​​surface contact and fit with the guide slope 12 of the back plate of the fan box 1.

[0059] To prevent oil from flowing into the joint between the fan housing 1 and the flip-connecting housing 3, a first flange 111 extending rearward (i.e., away from the interior of the fan housing 1) is provided around the periphery of the first opening window 11. Correspondingly, a second flange 311 extending forward (i.e., toward the fan housing 1) is provided around the periphery of the second opening window 31.

[0060] The ventilation opening diameter of the first opening window 11 is larger than that of the second opening window 31.

[0061] The axial length of the second flange 311 (i.e. its forward extension length) is greater than the axial length of the first flange 111 (i.e. its backward extension length).

[0062] When the flip-connecting housing 3 rotates forward to the working position, its second flange 311 is guided and inserted into the space enclosed by the first flange 111. Because the first opening window 11 has a larger diameter, it provides insertion space for the second flange 311. In the fully mated state, the longer second flange 311 completely passes through the area where the first flange 111 is located. Since the insertion structure itself has high torsional and eccentric load resistance, it enhances the overall rigidity and stability of the air intake channel during operation, helping to reduce vibration and noise. Furthermore, the second flange 311 covers the gap at the joint between the flip-connecting housing 3 and the fan housing 1, blocking the main path for oil leakage into the fixed housing 2.

[0063] Example 4 To minimize the space occupied inside the cabinets and maintain the overall aesthetics of the kitchen, the cross-sectional dimensions of the flip-up connecting box 3, the lifting smoke collection box 4, and the fixed box 2 increase sequentially. When the lifting smoke collection box 4 is fully retracted, the three components form a nested structure from the outside in. Specifically, the lifting smoke collection box 4 is located inside the fixed box 2, and the flip-up connecting box 3 is located inside the lifting smoke collection box 4. This design achieves space reuse in the vertical direction, allowing the range hood to be compactly stored when not in use, minimizing the space occupied inside the cabinets and maintaining the overall aesthetics of the kitchen.

[0064] In particular, the upper part of the flip-connecting box 3 is designed as a trapezoid with a smaller top and a larger bottom.

[0065] The smaller upper part of the trapezoid provides greater rotational clearance for its own flipping action, effectively avoiding motion interference with the fixed housing 2 during the flipping process. Meanwhile, the lower part of the flipping connecting housing 3 can dock with the similarly sized lifting smoke collection housing 4.

[0066] Example 5 Based on the linkage mechanism 6 described in Embodiment 2, this embodiment provides an elastic element between the first limiting member 63 and the second limiting member 64.

[0067] The elastic element is preferably a tension spring. One end is connected to a preset connection point on the first limiting member 63, and the other end is connected to a preset connection point on the second limiting member 64. When the flip-connecting housing 3 is in the retracted state, the tension spring is pre-stretched and in a taut state. Of course, the elastic element can also be a rubber elastomer, etc.

[0068] The core function of this elastic element is to limit the downward movement of the flip-connecting housing 3 and provide the necessary restoring force throughout the entire movement. Its specific function is manifested in the following stages: Initial state maintenance: In the non-working state, the pre-tension of the elastic element effectively overcomes the gravity of the flip-connecting housing 3 itself, suspending it stably and keeping it in the retracted position, preventing it from accidentally shifting down due to vibration or gravity, and ensuring the stability of the standby state.

[0069] Motion process buffering: When the linkage mechanism 6 is triggered, the lifting smoke collection box 4 forces the flip connecting box 3 to begin to move downward through the guide post 61, and the elastic element is further stretched. This gradually increasing reverse tension plays a buffering role, making the start-up of the flip connecting box 3 more stable and gentle, avoiding rigid impact, and reducing noise and component wear.

[0070] Automatic and reliable reset: When the work is finished and the lifting smoke collection box 4 rises, the potential energy stored in the elastic element, which has been stretched significantly, generates a strong and definite upward restoring force, thereby pulling the flip-connecting box 3 upward and driving it to flip backward until it is fully reset to the initial retracted position. This design ensures the absolute reliability of the reset action without relying on other power sources or complex control programs.

[0071] Example 6 To further improve operational reliability, the second limit switch 64 is equipped with an upper limit switch 65 and a lower limit switch 66. For example... Figure 6 As shown.

[0072] The upper limit switch 65 and the lower limit switch 66 are both position detection elements commonly used in the art, such as micro switches or proximity switches. They are fixedly installed at the upper and lower positions of the second limiting member 64.

[0073] Preferably, the first limiting member 63 is provided with a trigger baffle, which moves together with the first limiting member 63 and the flip-connecting housing 3 to trigger the corresponding limit switch at a specific position.

[0074] The upper limit switch 65 is installed in the position corresponding to the state when the flip connection housing 3 is fully retracted and reset.

[0075] The installation position of the lower limit switch 66 corresponds to the state when the flip-connecting housing 3 is lowered and flipped to be fully extended and docked.

[0076] The upper limit switch 65 and the lower limit switch 66 provide electrical control and action timing coordination functions for the core motion. Their working process is as follows: Upper limit detection and motion coordination: When the range hood stops working, the lifting smoke collection box 4 rises under the drive mechanism 5. At the same time, the flip-up connecting box 3 also returns to its original position under the tension of the elastic element.

[0077] Critical timing control: The system must ensure that the flip-connecting box 3 is fully reset before the lifting smoke collection box 4. If the lifting smoke collection box 4 rises too early or too fast, and the flip-connecting box 3 above it has not yet been reset, the two will interfere with each other and collide inside the fixed box 2.

[0078] The function of the upper limit switch 65: When the flip-connecting housing 3 moves back to the preset fully retracted position, the trigger stop on it will trigger the upper limit switch 65. After the switch is triggered, it will send an electrical signal of "flip-connecting housing has been fully reset" to the control system.

[0079] Control system response: Upon receiving this signal, the control system can instruct the drive mechanism 5 to continue driving the lifting smoke collection box 4 to complete the subsequent upward stroke until it is also fully retracted. This ensures the sequential movement of the two boxes, fundamentally preventing motion interference.

[0080] Lower limit detection and arrival confirmation: When the range hood is started, the lifting smoke collection box 4 descends and is driven by the linkage mechanism 6 to unfold the flip connecting box 3. When the flip connecting box 3 moves to the preset fully unfolded position and docks with the fan box 1, the trigger baffle will trigger the lower limit switch 66.

[0081] The function of the lower limit switch 66 is as follows: This signal is used to feedback to the control system that "the flip-over docking is complete". The control system can stop the drive motor 51 based on this signal, indicating that the range hood can enter the normal working state. At the same time, it also serves as a safety limit to prevent the linkage mechanism 6 from overtraveling.

[0082] Example 7 To achieve smooth lifting and lowering of the smoke collection box 4, in this embodiment, the inner cavity of the fan box 1 is provided with the aforementioned drive mechanism 5. The drive mechanism 5 includes a motor 51, a reducer 52, a driving bevel gear 53, a driven bevel gear 54, a vertically arranged lead screw, and a nut.

[0083] like Figure 6 , 7As shown, the specific structure and layout of the drive mechanism 5 are as follows: The motor 51, reducer 52, driving bevel gear 53 and driven bevel gear 54 are all arranged in the upper space of the fan housing 1, making full use of the unused space at the top of the fan housing 1 and making the structure more compact.

[0084] The reducer 52 is a worm gear reducer 52, whose input shaft is directly connected to the output shaft of the motor 51, while the output shaft is arranged laterally. The worm gear reducer 52 has the characteristics of large transmission ratio, smooth transmission and reverse self-locking, which can ensure that the lifting system can reliably stay at any position when the power is off, and will not slide down due to its own weight.

[0085] At each end of the transverse output shaft of the reducer 52, there is a drive bevel gear 53.

[0086] Two vertical lead screws are symmetrically arranged on the left and right sides of the lifting smoke collection box 4. The upper end of each lead screw meshes with the corresponding driving bevel gear 53 through a driven bevel gear 54, thereby converting the lateral rotational motion output by the reducer 52 into the vertical rotational motion of the lead screw.

[0087] Each lead screw is equipped with a nut, which is fixedly connected to the lifting connecting frame, which is then fixedly connected to the lower lifting smoke collection box 4.

[0088] When motor 51 starts, the power is reduced and amplified by worm gear reducer 52, and then synchronously transmitted to two driven bevel gears 54 by the driving bevel gears 53 at both ends of the transverse output shaft, driving the two lead screws to rotate synchronously. The nut that cooperates with the lead screw converts the rotational motion into linear motion under rotational constraint, and drives the lifting smoke collection box 4 to rise and fall smoothly through the lifting connecting frame.

[0089] The symmetrical double screw structure provides a balanced driving force for the lifting and lowering of the smoke collection box 4, effectively preventing jamming, uneven wear, and unstable lifting that may be caused by unilateral driving.

[0090] The drive components are located on the upper part of the fan housing 1 to optimize space utilization and avoid interference with the lower air duct system.

[0091] The worm gear reducer 52 is adopted, which utilizes its inherent reverse self-locking characteristic to ensure that the lifting system can reliably lock its position when the motor 51 is de-energized, thus ensuring high safety performance.

[0092] The above-described lifting range hood is a specific embodiment of the present invention, demonstrating the substantial features and progress of the present invention. Based on actual usage needs and under the guidance of the present invention, equivalent modifications in shape, structure, etc., can be made to it, all of which are within the scope of protection of this solution.

Claims

1. A lift-type range hood, characterized in that: Includes fan housing, fixed housing, flip-connecting housing, and lifting smoke collection housing; The fan housing is equipped with a smoke exhaust assembly, and a first opening window is opened on the housing. The fixed housing is located behind the fan housing, and the flip-connecting housing is housed inside it; The flip-connecting box can rotate relative to the fixed box. It is provided with a second opening window opposite to the first opening window. When the flip-connecting box rotates forward to the working position, its second opening window can be connected with the first opening window of the fan box, so that the oil fumes entering the flip-connecting box can enter the fan box through the second opening window and the first opening window. The bottom of the fixed box is provided with a lifting port, and the lifting smoke collection box passes through the lifting port and can move up and down relative to the fixed box through a drive mechanism; The inner cavity of the lifting smoke collection box, the inner cavity of the flip-connecting box, and the inner cavity of the fan box are connected in sequence to form an air intake channel.

2. The lifting range hood according to claim 1, characterized in that: The middle part of the back panel of the fan housing protrudes obliquely downward and backward, and the protrusion is provided with the first opening window.

3. A lifting range hood according to claim 2, characterized in that: The first opening window has a rearward first flange, and the second opening window has a forward second flange. The first opening window is larger than the second opening window, and the axial length of the second flange is greater than that of the first flange. When the flip-connecting housing is flipped to the working position, the second flange is inserted into the first opening window formed by the first flange, so that the two are connected.

4. A lifting range hood according to claim 1, characterized in that: The cross-sectional dimensions of the flip-connecting box, the lifting smoke collection box, and the fixed box increase sequentially. When the lifting smoke collection box is in a retracted state, the three are nested from the outside to the inside.

5. A lifting range hood according to claim 3, characterized in that: The upper part of the flip-connecting box is trapezoidal, with a smaller top and a larger bottom.

6. A lifting range hood according to claim 1, characterized in that: A linkage mechanism is provided between the flip-connecting box and the lifting smoke collection box; when the lifting smoke collection box descends to a set position, the flip-connecting box is driven to rotate through the linkage mechanism.

7. A lifting range hood according to claim 6, characterized in that: The linkage mechanism includes guide posts on the left and right sides of the flip-connecting box, vertical guide grooves on the left and right sides of the lifting smoke collection box, a first limiting member on the upper left and right sides of the flip-connecting box with an oblique guide groove, and a second limiting member fixed to both sides of the fixed box with a limiting post; the guide posts are slidably disposed in the vertical guide grooves; the limiting posts are embedded in the oblique guide grooves of the first limiting member; when the lifting smoke collection box descends to the point where the guide posts abut against the upper edge of the vertical guide grooves, the cooperation between the vertical guide grooves and the guide posts drives the flip-connecting box to descend synchronously. During this process, the limiting posts slide relative to each other in the oblique guide grooves, thereby guiding the flip-connecting box to flip forward relative to the fixed box.

8. A lifting range hood according to claim 7, characterized in that: An elastic element is provided between the first limiting member and the second limiting member.

9. A lifting range hood according to claim 8, characterized in that: The second limiting component is equipped with an upper limit switch and a lower limit switch.

10. A lifting range hood according to claim 1, characterized in that: The inner cavity of the fan housing is equipped with the aforementioned drive mechanism, which includes a motor, a reducer, a driving bevel gear, a driven bevel gear, a vertically arranged lead screw, and a nut. The motor, reducer, driving bevel gear, and driven bevel gear are all arranged in the upper space of the fan housing; the output shaft of the reducer is arranged horizontally, and a driving bevel gear is set at each end of the horizontal output shaft of the reducer; two vertical lead screws are symmetrically arranged on the left and right sides of the lifting smoke collection box; the upper end of each lead screw meshes with the corresponding driving bevel gear through a driven bevel gear; The motor drives the active bevel gear to rotate through the reducer, which in turn drives the driven bevel gear meshing with it to rotate, thereby driving the lead screw to rotate; the nut that cooperates with the lead screw is fixedly connected to the lifting smoke collection box or a component connected to it, thereby converting the rotational motion of the lead screw into the linear lifting motion of the lifting smoke collection box.

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