A range hood

Abstract

The application discloses an oil fume extractor, which comprises an air inlet assembly and an upper box body for arranging a fan system. The bottom of the upper box body is provided with an air inlet. The air inlet assembly comprises a lower box body and a fume collecting plate. The lower box body is provided with a back plate which extends downward from the bottom of the upper box body. The fume collecting plate has a closed state and an open state. In the closed state, the fume collecting plate closes the air inlet, and at least a part of the fume collecting plate covers the front surface of the back plate. The depth of the air inlet is greater than the thickness of the corresponding part of the lower box body. In the open state, the air inlet is opened, and a fume collecting cavity is formed between the rest of the fume collecting plate and the front surface of the back plate. The fume collecting cavity is communicated with the inside of the upper box body through the air inlet. Compared with the prior art, the oil fume extractor has the advantages that the lower box body does not need to form an air inlet channel in the form of a fixed inner cavity, the air inlet area is ensured to be large, the noise is reduced, the air inlet flow is ensured, the oil fume extractor is light and thin, the space utilization is improved, and the structural strength is ensured.

Description

[0001] The present application claims priority to the following Chinese patent applications:

[0002] 1. Application No. 202211324451.1, filed on October 27, 2022, entitled "A Range Hood";

[0003] 2. Application No. 202211324487.X, filed on October 27, 2022, entitled "A Range Hood". TECHNICAL FIELD

[0004] The present application relates to an oil fume purification device, in particular to a range hood. BACKGROUND

[0005] The range hood has become one of the indispensable kitchen household appliances in modern families. The range hood works by using the principle of fluid dynamics, and uses a centrifugal fan installed inside the range hood to suck and exhaust the oil fume, and uses a filter screen to filter part of the oil particles. The centrifugal fan includes a volute, an impeller installed in the volute, and a motor driving the impeller to rotate. When the impeller rotates, a negative pressure suction force is generated at the center of the fan, which sucks the oil fume below the range hood into the fan, and the oil fume is accelerated by the fan and then collected and guided by the volute to be discharged outdoors.

[0006] Due to the limited space of the kitchen, in order to improve the space utilization of the kitchen, there is a thin range hood, such as a new structure ultra-thin range hood disclosed in Chinese Patent No. 201420538159.4, which includes a wind box and an oil fume suction cavity. The oil fume suction cavity is arranged directly below the wind box and communicates with the wind box. The oil fume suction cavity is arranged on the wall body, and the front panel of the oil fume suction cavity is gradually inclined to the wall body from top to bottom. For example, a ultra-thin bottom suction type range hood disclosed in Chinese Patent No. 201820775851.7 includes a wind box and a smoke collecting cover. The smoke collecting cover is arranged directly below the wind box and communicates with the wind box. The wind box is a three-dimensional columnar cabinet shape, and the smoke collecting cover is a hollow rectangular flat plate with a width greater than its height. The lower side of the smoke collecting cover is provided with a hidden air inlet along the long side. The smoke collecting cover is provided with a smoke guide plate arranged above the hidden air inlet. The smoke guide plate and the front wall of the smoke collecting cover cavity form an angle of 45°-60°.

[0007] As can be seen from the above, the existing thin range hood, whether it is a near suction type formed by air inlet from the front side or a low suction type formed by air inlet from the bottom, must have an air inlet channel close to the wall. In order to ensure the oil fume suction effect, the air inlet channel should not be too small, which results in a relatively large thickness of the exposed part of the range hood. SUMMARY

[0008] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood that, while ensuring the smoke extraction effect, reduces the space occupied by the exposed parts of the range hood and improves the space utilization rate.

[0009] The technical solution adopted by the present invention to solve the above-mentioned technical problem is as follows: a range hood, comprising an air inlet assembly and an upper housing for mounting a fan system, wherein the bottom of the upper housing is provided with an air inlet, characterized in that: the air inlet assembly comprises:

[0010] The lower housing has a back panel extending downward from the bottom of the upper housing;

[0011] The smoke collection panel has a closed state and an open state: and

[0012] When closed, the smoke collection plate closes the air inlet, at least a portion of the smoke collection plate covers the front of the back panel, and the depth of the air inlet is greater than the thickness of the lower housing portion corresponding to the back panel.

[0013] When in the open state, the air inlet is opened, and a smoke-collecting cavity is formed between the smoke-collecting plate and the front of the back plate. The smoke-collecting cavity is connected to the interior of the upper housing through the air inlet.

[0014] By designing the smoke-collecting plate, the air inlet can be partially closed when the range hood is off and opened when it is working. When flipped up, the plate pushes forward to form a smoke-collecting cavity with the back panel, expanding the smoke-collecting area and ensuring good smoke extraction. When closed, it moves backward until it is close to the back panel (wall). While maintaining structural strength, this eliminates the need for a fixed internal cavity for the air inlet channel. Furthermore, the greater depth of the air inlet ensures a larger air intake area, allowing for a slim profile while maintaining sufficient airflow, reducing the space occupied by the exposed parts of the range hood and improving space utilization. In addition, as mentioned above, since a fixed internal cavity for the air inlet channel is not required in the lower housing, noise during air intake is avoided due to an insufficiently thick air inlet channel. The lower housing primarily serves the function of smoke collection, allowing it to be made even thinner.

[0015] Preferably, the thickness of the lower housing portion corresponding to the back plate does not exceed 50mm.

[0016] Furthermore, the lower housing has a recessed portion on one side corresponding to the smoke-collecting plate, and the recessed portion forms part of the smoke-collecting cavity, thereby further expanding the range of the smoke-collecting cavity.

[0017] According to one aspect of the present invention, the smoke-collecting plate includes a baffle and a smoke-blocking plate, the smoke-blocking plate being rotatably connected to the baffle; in the closed state, the baffle closes the air inlet, and the smoke-blocking plate covers the front of the back plate; in the open state, the baffle opens the air inlet, and the smoke-blocking plate and the baffle together form a smoke-collecting cavity with the front of the back plate.

[0018] Furthermore, the length of the baffle is L1, and the length of the smoke baffle is L2. The ratio of L1 to L2 ranges from 1:4 to 1:1.5. Under the premise that the opening of the baffle and the smoke baffle does not affect cooking, the total height of the two plates is basically limited. If this ratio is increased further, the smoke baffle will be closer to the user's face when it is open, affecting the user experience and possibly obstructing the view. Although a larger L2 can make the lower end of the smoke baffle lower, and the negative pressure zone will also drop lower, which is beneficial to improving the oil fume extraction effect, the risk of hitting the pan will increase. If the ratio is too small, the width of the air inlet will be small, affecting the smoothness of air intake.

[0019] To achieve the maximum air intake area and smoke collection area, the baffle is rotatably connected to the upper or lower housing at the front side or near the front side of the air inlet. The upper end of the smoke baffle is connected to the free end of the baffle, and the free end of the baffle covers the air inlet when the baffle closes the air inlet.

[0020] Furthermore, the range hood also includes a first motion mechanism for driving the smoke baffle and the baffle to move together. The first motion mechanism includes a rotation drive module and a first connecting rod driven to rotate by the rotation drive module. One end of the first connecting rod is rotatably connected to the upper housing, and the other end of the first connecting rod is fixed to the smoke baffle, thereby simplifying the motion mechanism.

[0021] Furthermore, in order to maximize the effect of the baffle on the length of the smoke baffle and maximize the smoke collection area, the left and right sides of the baffle are provided with sliding grooves, and the lower or upper box is provided with a rotating shaft, which is fitted into the sliding groove.

[0022] Preferably, to reduce the escape of oil fumes from the left and right sides, the lower box also includes a first side plate and a top plate. The top plate is formed by extending forward from the top of the back plate. The width of the back plate is greater than the width of the upper box. The top plate is located on the left and right sides of the upper box. The first side plate is arranged on the left and right sides of the top plate and the back plate. The pivot is arranged on the first side plate.

[0023] According to another aspect of the present invention, the smoke collection plate includes a baffle and a smoke baffle, the baffle being disposed at the air inlet and movable back and forth; in the closed state, the baffle closes the air inlet, and the smoke baffle covers the front of the back plate; in the open state, the baffle opens the air inlet, and a smoke collection cavity is formed between the smoke baffle and the front of the back plate.

[0024] Furthermore, the range hood also includes a second motion mechanism for driving the smoke baffle and its linkage. This second motion mechanism includes a linear drive module, a guide rail assembly, and a second connecting rod. The guide rail assembly includes a first guide rail fixed within the upper housing and a second guide rail slidably engaged with the first guide rail. The output end of the linear drive module is connected to the second guide rail. The baffle is fixedly connected to the second guide rail and moves synchronously. The second connecting rod is rotatably connected to the second guide rail and fixed to the smoke baffle. This simplifies the motion mechanism.

[0025] Furthermore, the second motion mechanism includes an active end and a driven end. The positions where the active end and the driven end are connected to the smoke baffle are spaced apart in the left-right direction. The positions where the active end and the driven end are connected to the baffle are also spaced apart in the left-right direction. Both the active end and the driven end include the aforementioned guide rail assembly and second link. The active end also includes the aforementioned linear drive module. By connecting the smoke baffle to the guide rail assembly, the forward and backward movement of the active end second guide rail determines the rotation angle of the smoke baffle, thereby controlling the forward and backward movement of the driven end second guide rail. Since the smoke baffle is not absolutely rigid, there is a stroke difference between the two second guide rails at the beginning and end of the motion system. The baffle can directly connect the two second guide rails, thereby ensuring the synchronization of the movement on both sides. Secondly, when the left and right sides are not synchronized, the difference in the stroke of the two second guide rails causes a difference in the rotation angle of the smoke baffle, resulting in the distortion of the smoke baffle, which can correct the asynchrony.

[0026] Furthermore, in order to ensure the stable rotation of the second link, the second motion mechanism also includes a third link. One end of the second link is fixed to the upper end of the smoke baffle, while the other end is rotatably connected to one end of the third link. The other end of the third link is rotatably disposed in the upper housing.

[0027] Compared with the prior art, the advantages of this invention are as follows: Through the design of the smoke-collecting plate, the air inlet can be partially closed in the off state and opened in the working state. Simultaneously, when flipped up, the smoke-collecting plate can be pushed forward to form a smoke-collecting cavity with the back panel, expanding the smoke-collecting area and ensuring good smoke extraction. When closed, it moves backward until it is close to the back panel (wall). While ensuring structural strength, there is no need to form a fixed internal cavity for the air inlet channel. Furthermore, due to the greater depth of the air inlet, a larger air inlet area can be ensured, allowing for both sufficient airflow and... The design achieves an extremely thin profile, reducing the space occupied by the exposed parts of the range hood and improving space utilization. Furthermore, as mentioned above, since there is no need to form a fixed internal cavity for the air intake channel in the lower casing, noise will not be generated during air intake due to the thinness of the air intake channel. The lower casing mainly serves to collect smoke, which allows it to be made thinner. Through the rotating connection of the baffle and the smoke baffle, the air intake is closed and the depth in the front and back directions is reduced when both are folded. When unfolded, the length of the smoke baffle can be extended by the baffle, thereby expanding the smoke collection area and improving the smoke extraction effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the closed state of the range hood according to the first embodiment of the present invention;

[0029] Figure 2 for Figure 1 A cross-sectional view of a range hood;

[0030] Figure 3 for Figure 2 A magnified schematic diagram of part I;

[0031] Figure 4 for Figure 1 A schematic diagram of the smoke baffle, baffle and its moving mechanism of a range hood;

[0032] Figure 5 This is a schematic diagram of the open intermediate state of the range hood according to the first embodiment of the present invention;

[0033] Figure 6 for Figure 5 A cross-sectional view of a range hood;

[0034] Figure 7 This is a schematic diagram of the range hood in the open state according to the first embodiment of the present invention;

[0035] Figure 8 for Figure 7 A cross-sectional view of a range hood;

[0036] Figure 9 This is a schematic diagram of the smoke baffle, baffle and its moving mechanism of the range hood according to the second embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of the smoke baffle, baffle and its moving mechanism of the range hood according to the third embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the closed state of the range hood according to the fourth embodiment of the present invention;

[0039] Figure 12 for Figure 11 A cross-sectional view of a range hood;

[0040] Figure 13 for Figure 11 A schematic diagram of the smoke baffle, baffle and its moving mechanism of a range hood;

[0041] Figure 14 for Figure 13 A magnified schematic diagram of part II;

[0042] Figure 15 This is a schematic diagram of the open intermediate state of the range hood according to the fourth embodiment of the present invention;

[0043] Figure 16 for Figure 15 A cross-sectional view of a range hood;

[0044] Figure 17 This is a schematic diagram of the range hood in the open state according to the fourth embodiment of the present invention;

[0045] Figure 18 for Figure 17 A cross-sectional view of a range hood;

[0046] Figure 19 This is a cross-sectional view of the range hood in the closed state according to the fifth embodiment of the present invention;

[0047] Figure 20 This is a cross-sectional view of the range hood in the open state according to the fifth embodiment of the present invention. Detailed Implementation

[0048] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0049] 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," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the 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. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0050] Example 1

[0051] See Figures 1-6 A range hood includes an air intake assembly 1 and an upper housing 2, wherein a fan system 3 is housed within the upper housing 2. In the installed state, the upper housing 2 is concealed within a kitchen cabinet, with its bottom surface flush with the cabinet, except for the air intake assembly 1 which protrudes below the cabinet. Alternatively, the fan system 3 can be housed in another housing connected to the upper housing 2.

[0052] The air intake assembly 1 includes a lower housing 11, a smoke baffle 12, and a baffle 13. The smoke baffle 12 and the baffle 13 constitute a smoke collection plate. An air inlet 21 is preferably provided at the bottom of the upper housing 2, near the rear end, and extends in the left-right direction. The fan system 3 is located near the front of the upper housing 2. A filter 5 is provided inside the upper housing 2. The filter 5 is located above the air inlet 21 and extends forward beyond the air inlet 21. The filter 5 gradually slopes downward from front to back. The filter 5 is closed at the position corresponding to the fan system 3 without mesh openings. The structure and arrangement of the filter 5 can prevent oil droplets from flying out during operation, and at the same time guide the condensed oil in the fan system 3 to the rear side, and collect it in the oil cup 6 located at the bottom of the lower housing 11.

[0053] The lower housing 11 includes a back panel 111, a first side panel 112, and a top panel 113. The back panel 111 is located below the rear side of the upper housing 2, extending downward from the lower end of the upper housing 2. The top panel 113 is formed by extending forward from the top of the back panel 111. The back panel 111, the first side panel 112, and the top panel 113 can be independent panels or integral panels. The top panel 113 can be gradually inclined downward from front to back. The width (left-right dimension) of the back panel 111 is greater than the width of the upper housing 2. The top panel 113 is located on the left and right sides of the upper housing 2. Preferably, the top panel 113 is close to the lower end of the upper housing 2. The first side panels 112 are provided on the left and right sides of the top panel 113. Alternatively, the first side panels 112 can be provided on the left and right sides of the back panel 111 or on the left and right sides of the smoke baffle 12. See also Figure 8 The depth h1 (dimension in the front-to-back direction) of the air inlet 21 is greater than the thickness h2 of the lower housing 11 part corresponding to the back panel 111, and h2 does not exceed 50mm.

[0054] The lower housing 11 forms a recessed portion 114 on one side corresponding to the smoke-collecting plate, and the recessed portion 114 is shaped to be recessed away from the smoke baffle 12. Alternatively, the width of the back plate 111 can be equal to the width of the upper housing 2. In this case, there is no need to provide a top plate 113, and the first side plates 112 can still be provided on the left and right sides of the back plate 111 or the left and right sides of the smoke baffle 12.

[0055] A smoke baffle 12 is rotatably mounted on the front side of the back panel 111. Its upper end or near the upper end is used for connection, while its lower end is a free end. The axis of rotation extends in the left-right direction, and it serves to collect smoke when open. A baffle 13 is rotatably mounted at the air inlet 21, and its axis of rotation extends in the left-right direction to open and close the air inlet 21. The baffle 13 is rotatably connected to the front side or near the front side of the air inlet 21, and the upper end of the smoke baffle 12 is connected to the free end (the rear end in the closed state) of the baffle 13. When the baffle 13 closes the air inlet 21, it simultaneously closes both the front and rear ends of the top panel 113.

[0056] The smoke baffle 12 and baffle 13 can move independently or in conjunction. In this embodiment, the smoke baffle 12 and baffle 13 move in conjunction. Therefore, the range hood also includes a motion mechanism for driving the smoke baffle 12 and baffle 13 in conjunction. The motion mechanism includes a drive mechanism 41 and a transmission mechanism. The drive mechanism 41 is preferably an electric push rod. The transmission mechanism includes a first connecting rod 421. One end of the first connecting rod 421 is rotatably connected to the inner side of the upper housing 2, and the other end of the first connecting rod 421 is fixed to the smoke baffle 12. The electric push rod (excluding the push rod used for output) is rotatably connected to the upper housing 2, and the push rod of the electric push rod is rotatably connected to the portion between the two ends of the first connecting rod 421. The rotation axis of the first connecting rod 421 extends in the left-right direction. The position where the first connecting rod 421 connects to the upper housing 2 is the rotation center of the smoke baffle 12. The first connecting rod 421 is curved and protrudes backward, thereby avoiding interference with the baffle 13 during movement. The aforementioned rotatable electric actuator constitutes a rotation drive module.

[0057] The components of the aforementioned motion mechanism constitute the driving end of the motion mechanism, which also includes a driven end, which only has a transmission mechanism. The driving end and the driven end are respectively connected to positions arranged at intervals on the left and right sides of the smoke baffle 12.

[0058] The rear end of the baffle 13 is rotatably connected to the upper end of the smoke baffle 12, with the axis of rotation extending in the left-right direction. Slide grooves 131 are provided on both the left and right sides of the baffle 13, and a rotating shaft 132 that mates with the slide grooves 131 is provided on the first side plate 112. The rotating shaft 132 can also rotate relative to the slide grooves 131. When the widths of the back plate 111 and the upper housing 2 are the same, the rotating shaft 132 can be positioned inside the upper housing 2. That is, the baffle 13 is rotatably positioned relative to the upper housing 2.

[0059] See Figure 1 and Figure 2 At this time, the range hood is in the off state, the baffle 13 closes the air inlet 21, the free end of the baffle 13 covers the air inlet 21, the smoke baffle 12 is located in front of the back panel 111, covers the front of the back panel 111, is in a roughly vertical state, and can fit against the back panel 111.

[0060] See Figure 5 and Figure 6 The drive mechanism 41 pushes the first link 421 around Figure 6 The counterclockwise rotation shown pushes the smoke baffle 12 outward and flips it, thereby causing the baffle 13 to rotate. The movement trajectory of the baffle 13 is also limited by the cooperation of the rotating shaft 132 and the slide groove 131.

[0061] See Figure 7 and Figure 8When the smoke baffle 12 is opened to its limit, the baffle 13 and the smoke baffle 12 are in an unfolded state, almost on the same plane. The baffle 13 and the smoke baffle 12 together form a smoke-collecting plate, which lengthens the original smoke baffle 12, allowing for a larger smoke-collecting range. At this time, the smoke baffle 12 is located in front of the position when closed. The smoke baffle 12 and the baffle 13 together form a smoke-collecting cavity Q with the front of the back plate 111. The concave part 114 also forms part of the smoke-collecting cavity Q. The smoke-collecting cavity Q is connected to the interior of the upper box 2 through the air inlet 21. The fumes enter the upper box 2 from the rear side of the smoke baffle 12 and the baffle 13 through the air inlet 21.

[0062] The length of the baffle 13 is L1, and the length of the smoke baffle 12 is L2. The ratio of L1 to L2 ranges from 1:4 to 1:1.5, which basically limits the total height of the baffle and smoke baffle without affecting cooking when they are open. If this ratio is increased further, the smoke baffle will be too close to the user's face when it is open, affecting the user experience and possibly obstructing the view. Although a larger L2 can make the lower end of the smoke baffle lower, and the negative pressure zone will also drop lower, which is beneficial to improving the smoke extraction effect, the risk of the pan hitting the food will increase. On the other hand, if the ratio is too small, the air inlet width will be small, affecting the smoothness of air intake.

[0063] This embodiment achieves both an extremely thin profile in the off state and a large air intake channel and a large smoke collection range in the working state by folding and unfolding the baffle 13 at the air inlet of the range hood relative to the smoke baffle 12. This design also eliminates the need for the air intake assembly 1 to form an air intake channel. When closed, the smoke baffle 12 can be close to the back panel 111, making the overall thickness of the air intake assembly 1 extremely thin, preferably around ten millimeters.

[0064] Example 2

[0065] See Figure 9 In this embodiment, the difference from Embodiment 1 is that the drive mechanism 41 uses a motor, and the transmission mechanism further includes a first gear 422 and a first rack 423. The first gear 422 is connected to the output shaft of the motor and can rotate around a left-right extending axis. The first gear 422 and the first rack 423 mesh, and the first rack 423 is fan-shaped with its teeth formed on the arc surface of the fan shape. The first rack 423 is fixed to the first connecting rod 421. The motor, the first gear 422, and the first rack 423 constitute a rotation drive module.

[0066] Therefore, when the motor starts, the first gear 422 can drive the first rack 423 to rotate, which in turn drives the first connecting rod 421 to rotate.

[0067] Example 3

[0068] See Figure 10In this embodiment, the difference from the second embodiment is that the first connecting rod 421 is directly connected to the output shaft of the motor and is directly driven to rotate by the motor.

[0069] Example 4

[0070] See Figures 11-16 The difference from the above embodiment is that the air inlet 21 is located on the bottom surface of the upper housing 2 near the rear end. The air inlet assembly 1, apart from the smoke baffle 12 and the baffle 13, only includes the back plate 111 (that is, the lower housing 11 only includes the back plate 111). The back plate 111 extends downward from the rear side of the upper housing 2 and can be independent of the upper housing 2 or integrated with it.

[0071] The smoke baffle 12 is rotatably mounted on the front side of the back plate 111, with its lower end being a free end and its axis of rotation extending in the left-right direction. The baffle 13 is movable back-and-forth at the air inlet 21, and to avoid interference, the baffle 13 may be slightly higher than the bottom surface of the upper housing 2. The upper end of the smoke baffle 12 is located at the air inlet 21 and can move back and forth; preferably, the smoke baffle 12 is attached to the rear end of the baffle 13.

[0072] The smoke baffle 12 and the baffle 13 can be driven by independent second motion mechanisms or driven in conjunction by the same motion mechanism. In this embodiment, the smoke baffle 12 and the baffle 13 move in conjunction. Therefore, the range hood also includes a second motion mechanism for driving the smoke baffle 12 and the baffle 13 in conjunction. The second motion mechanism includes a second drive mechanism 43 and a second transmission mechanism. The second drive mechanism 43 is preferably a motor. The second transmission mechanism includes a second gear 441, a second rack 442, a guide rail assembly 443, a second connecting rod 444, and a third connecting rod 445. The output end of the second drive mechanism 43 is connected to the second gear 441 in a transmission connection. For example, in this embodiment, the second gear 441 can be set on the output shaft of the second drive mechanism 43 (motor), and the rotation axis of the second gear 441 extends in the left-right direction. The second rack 442 meshes with the second gear 441. The guide rail assembly 443 includes a first guide rail 4431 fixed inside the upper housing 2 and a second guide rail 4432 that slides with the first guide rail 4431. The second rack 442 is fixed to the second guide rail 4432, and the baffle 13 is fixed to the second guide rail 4432. Thus, when the second drive mechanism 43 is activated, the second guide rail 4432 can be driven to slide back and forth through the engagement of the gear and rack, thereby driving the baffle 13 to slide back and forth.

[0073] The second connecting rod 444 is rotatably mounted on the second guide rail 4432. One end of the rod is fixed to the upper end of the smoke baffle 12, and the other end is rotatably connected to one end of the third connecting rod 445. The other end of the third connecting rod 445 is rotatably mounted inside the upper housing 2. The rotation axes of both the second connecting rod 444 and the third connecting rod 445 extend in the front-rear direction. Thus, when the second guide rail 4432 slides back and forth, it drives the second connecting rod 444 to rotate, thereby causing the smoke baffle 12 to achieve a combined motion of moving back and forth and rotating around the rotatable connection point with the second guide rail 4432. During the movement, the upper end of the smoke baffle 12 remains in close contact with the rear end of the baffle 13 to avoid gaps that could lead to pressure leakage. The aforementioned third connecting rod 445 makes the rotation of the second connecting rod 444 more stable.

[0074] The components of the second motion mechanism constitute the active end of the second motion mechanism. The second motion mechanism also includes a driven end, which differs from the active end in that it only includes the guide rail assembly 443, the second connecting rod 444, and the third connecting rod 445. The active end is connected to one side of the smoke baffle 12 and the baffle 13, and the driven end is connected to the other side of the smoke baffle 12 and the baffle 13, so as to achieve synchronous motion accuracy of the left and right sides of the smoke baffle 12 and the baffle 13.

[0075] The second motion mechanism of this embodiment connects the smoke baffle 12 to the guide rail assembly 443. The forward and backward movement of the active end second guide rail 4432 determines the rotation angle of the smoke baffle 12, thereby controlling the forward and backward movement of the driven end second guide rail 4432. Since the smoke baffle 12 is not absolutely rigid, there is a stroke difference between the two second guide rails 4432 at the beginning and end of the motion system. The baffle 13 can directly connect the two second guide rails 4432, thereby ensuring the synchronization of the movement on both sides (similar to creating a closed-loop structure at the beginning and end). Furthermore, when the left and right sides are not synchronized, the difference in the stroke of the two second guide rails 4432 causes a difference in the rotation angle of the smoke baffle 12, resulting in the distortion of the smoke baffle 12, which can correct the asynchrony.

[0076] To ensure the consistency of the rotation direction when the smoke baffle 12 is opened or closed, the distance from the rotational connection point of the third link 445 and the upper housing 2 to the rear side of the upper housing 2 is less than or equal to the distance from the rotational connection point of the third link 445 and the second link 444 to the rear side of the upper housing 2.

[0077] Second side panels 14 are also provided on the left and right sides of the smoke baffle 12, extending rearward from the left and right sides of the smoke baffle 12. When the air inlet assembly 1 is closed, the second side panels 14 wrap around the back panel 111, which can reduce the mating gap of the exposed surface and improve the overall integrity. At the same time, the two second side panels 14 can prevent excessive pressure relief on both sides and ensure the fume extraction effect.

[0078] See Figure 11 and Figure 12When the range hood is off, the baffle 13 closes the air inlet 21, and the smoke baffle 12 is in a roughly vertically extended state.

[0079] See Figure 15 and Figure 16 When the range hood is turned on, the second drive mechanism 43 is activated, causing the baffle 13 to slide forward and gradually open the air inlet 21. At the same time, the smoke baffle 12 flips forward.

[0080] See Figure 17 and Figure 18 When the baffle 13 slides forward to its limit position, that is, the rear end of the baffle 13 is flush with the front edge of the air inlet 21, the smoke baffle 12 and the front of the back plate 111 form a smoke collection chamber Q, and the oil fumes enter the upper box 2 from the rear side of the smoke baffle 12 through the air inlet 21.

[0081] This design also eliminates the need for an air intake channel in the air intake assembly 1. When closed, the smoke baffle 12 can be flush against the back panel 111, resulting in an extremely thin overall thickness for the air intake assembly 1, preferably around ten millimeters.

[0082] Example 5

[0083] See Figure 19 and Figure 20 In this embodiment, the difference from Embodiment 4 is that the second driving mechanism 43 adopts an electric push rod, the output end of which is connected to the second guide rail 4432 to drive the second guide rail 4432 to slide back and forth. To avoid interference with the guide rail assembly 443, the electric push rod is set at an angle to the horizontal direction, and its output end is rotatably connected to the second guide rail 4432.

[0084] Alternatively, other existing linear drive modules can be used to replace the motor gear rack in Embodiment 4 and the electric push rod in Embodiment 5, such as the motor lead screw and nut combination, the motor multi-link combination, etc.

Claims

1. A range hood, comprising an air inlet assembly (1) and an upper housing (2) for housing a fan system, wherein the bottom of the upper housing (2) is provided with an air inlet (21), characterized in that: The air intake assembly (1) includes: The lower housing (11) has a back plate (111) extending downward from the bottom of the upper housing (2); and The smoke collection panel has a closed state and an open state: When closed, the smoke collection plate closes the air inlet (21), and at least a portion of the smoke collection plate covers the front of the back plate (111). The depth dimension (h1) of the air inlet (21) is greater than the thickness dimension (h2) of the lower box (11) corresponding to the back plate (111). When in the open state, the air inlet (21) is opened, and a smoke collection cavity (Q) is formed between the front of the smoke collection plate and the back plate (111). The smoke collection cavity (Q) is connected to the interior of the upper box (2) through the air inlet (21). The lower box (11) has a recess (114) on one side corresponding to the smoke collection plate, and the recess (114) forms part of the smoke collection cavity (Q). The smoke collection plate includes a baffle (13) and a smoke baffle (12), the smoke baffle (12) and the baffle (13) being rotatably connected; in the closed state, the baffle (13) closes the air inlet (21), and the smoke baffle (12) covers the front of the back plate (111); in the open state, the baffle (13) opens the air inlet (21), and the smoke baffle (12) and the baffle (13) together form the smoke collection cavity (Q) between the front of the back plate (111).

2. The range hood according to claim 1, characterized in that: The thickness (h2) of the lower housing (11) portion corresponding to the back plate (111) does not exceed 50 mm.

3. The range hood according to claim 1, characterized in that: The length of the baffle (13) is L1, and the length of the smoke baffle (12) is L2. The ratio of L1 to L2 is 1:4 to 1:1.

5.

4. The range hood according to claim 1, characterized in that: The baffle (13) is rotatably connected to the upper box (2) or the lower box (11) at a position in front of or near the air inlet (21). The upper end of the smoke baffle (12) is connected to the free end of the baffle (13). The free end of the baffle (13) covers the air inlet (21) when the baffle (13) closes the air inlet (21).

5. The range hood according to claim 4, characterized in that: The range hood also includes a first motion mechanism for driving the smoke baffle (12) and the baffle (13) to move together. The first motion mechanism includes a rotation drive module and a first connecting rod (421) driven to rotate by the rotation drive module. One end of the first connecting rod (421) is rotatably connected to the upper housing (2), and the other end of the first connecting rod (421) is fixed to the smoke baffle (12).

6. The range hood according to claim 5, characterized in that: The baffle (13) has sliding grooves (131) on its left and right sides, and a rotating shaft (132) is provided in the lower box (11) or the upper box (2), and the rotating shaft (132) is fitted in the sliding groove (131).

7. The range hood according to claim 6, characterized in that: The lower housing (11) also includes a first side plate (112) and a top plate (113). The top plate (113) is formed by extending forward from the top of the back plate (111). The width of the back plate (111) is greater than the width of the upper housing (2). The top plate (113) is located on the left and right sides of the upper housing (2). The first side plate (112) is arranged on the left and right sides of the top plate (113) and the back plate (111). The pivot (132) is arranged on the first side plate (112).

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