Range hood

Abstract

The utility model discloses a range hood which comprises an exhaust fume collecting hood, a range hood cover, a range hood cover and a range hood cover plate, wherein an exhaust fume inlet is formed in the exhaust fume collecting hood; the box body is connected to the exhaust fume collecting hood; the smoke deflector assembly comprises a first smoke deflector and a second smoke deflector which are arranged in parallel in the left-right direction of the range hood; the movement mechanism is used for driving the first smoke guide plate and the second smoke guide plate to ascend and descend so as to open and close the corresponding smoke inlet parts; the movement mechanism comprises a driving mechanism, a transmission mechanism and a bracket fixedly arranged in the box body, and the transmission mechanism comprises a first connecting rod which is connected with the first smoke guide plate and synchronously ascends and descends; the second connecting rod is connected with the second smoke deflector and ascends and descends synchronously; the third connecting rod is rotationally connected with the first connecting rod; the fourth connecting rod is rotationally connected with the second connecting rod; the fifth connecting rod is in transmission connection with the driving mechanism, the fifth connecting rod is rotationally connected with the third connecting rod and the fourth connecting rod, the fifth connecting rod is further rotationally connected with the support, and the connecting position is located between the third connecting rod and the fourth connecting rod.

Description

Technical Field

[0001] This utility model relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a centrifugal fan inside to draw in and exhaust cooking fumes, and a filter to remove some of the grease particles.

[0003] Range hoods typically come in two types: top-mounted and side-mounted. Top-mounted range hoods utilize the principle of rising fumes, creating a negative pressure zone directly above the stove to draw in and exhaust the naturally rising fumes produced during cooking. Their advantages include a stylish and simple appearance, a large air volume, suitability for larger spaces, and the ability to capture fumes from a distance from the stove. However, their disadvantages include a higher installation height, and in low-smoke cooking conditions, the fumes above the pan are easily disturbed by ambient air, causing them to escape and resulting in poor fume extraction.

[0004] Therefore, a smoke guide plate is usually installed below the air inlet of a top-mounted range hood to form a ring-type suction structure, utilizing the wall-attachment effect to improve the smoke extraction effect. For example, Chinese Patent Application No. 201410419676.4 discloses a top-mounted range hood with a smoke guide plate, which includes a body, a smoke collection hood, and a smoke guide plate. The smoke collection hood is connected to the body, and a fan is installed inside the body. The smoke collection hood has an air inlet, and the smoke guide plate is positioned directly opposite the air inlet of the smoke collection hood and fixed to the smoke collection hood by a bracket or buckle. There is a gap between the smoke guide plate and the smoke collection hood to form a smoke channel.

[0005] Range hoods with smoke guide plates have become increasingly popular in recent years because they do not drip oil and have good smoke extraction efficiency. However, existing range hoods with smoke guide plates often have the following disadvantages:

[0006] 1. When traditional range hoods with smoke guide plates are used on ordinary double stoves, the amount of smoke generated during cooking differs greatly between the stir-frying side and the soup-making side, making it impossible to adjust the airflow or air inlet area to suit the cooking conditions.

[0007] 2. Some range hoods with lifting baffles, although the overall air inlet adjusts with the amount of cooking fumes, mainly use a lifting structure with left and right dual electric push rods and guide rails. The concealed movement mechanism of a range hood disclosed in Chinese Patent Application No. 202121385660.8, if exposed in the oil circuit environment, results in a relatively large push rod, affecting the air intake volume and total pressure efficiency, and the cost of two sets of drives is also high. On the other hand, some products that place the electric push rods externally to the fan frame, such as the range hood with a lifting baffle disclosed in Chinese Patent Application No. 201720205996.9, will result in a larger product size, affecting the aesthetics or making it impossible to cover the kitchen cabinets. Utility Model Content

[0008] The technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a range hood that can extend its service life, and can more precisely adjust the position of the smoke guide plate to adapt to cooking conditions through a single drive mechanism, thereby saving space and reducing costs.

[0009] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a range hood, comprising:

[0010] A smoke hood with a smoke inlet formed on it;

[0011] The enclosure is connected to the smoke collection hood;

[0012] The smoke guide plate assembly includes a first smoke guide plate and a second smoke guide plate arranged side by side along the left-right direction of the range hood; and

[0013] A motion mechanism is used to drive the first and second smoke guide plates to rise and fall, thereby opening and closing the corresponding smoke inlet portions; characterized in that:

[0014] The motion mechanism includes a drive mechanism, a transmission mechanism, and a bracket fixedly mounted inside the housing. The transmission mechanism includes:

[0015] The first connecting rod is connected to the first smoke guide plate and moves up and down synchronously.

[0016] The second link connects to the second smoke guide plate and moves up and down synchronously.

[0017] The third link is rotatably connected to the first link;

[0018] The fourth link is rotatably connected to the second link;

[0019] The fifth link is connected to the drive mechanism. The fifth link is rotatably connected to the third link and the fourth link respectively. The fifth link is also rotatably connected to the bracket and the connection position is located between the connection points of the third link and the fourth link, so that the first link and the second link move in opposite directions.

[0020] This invention, based on a range hood with smoke guide plates, utilizes a single drive mechanism to link two liftable smoke guide plates on both sides via multiple connecting rods. This allows for partial or full opening of the smoke guide plate on the stir-frying side during high-intensity cooking, ensuring concentrated airflow and negative pressure at the main intake. Conversely, on the other side, the smoke guide plate is partially or fully closed, reducing the corresponding flow area and increasing relative resistance. This reduces pressure loss and airflow distribution, resulting in significantly improved smoke extraction compared to ordinary range hoods without two smoke guide plates at the same airflow volume. This achieves a low-cost range hood with enhanced anti-interference capabilities. Furthermore, the single-drive multi-link mechanism, arranged longitudinally, saves space compared to traditional multi-push-rod separate drives, minimizing impact on overall size, airflow, and intake efficiency, while also reducing costs and making it effective against harsh environments such as oil fumes.

[0021] Preferably, to ensure stable operation of the motion mechanism, the rotation center at the connection between the third link and the first link is C, the rotation center at the connection between the third link and the fifth link is A, the rotation center at the connection between the fourth link and the second link is D, the rotation center at the connection between the fourth link and the fifth link is B, and the rotation center at the connection between the fifth link and the support is M, and AC = BD, with M being the midpoint between A and B.

[0022] Furthermore, the transmission mechanism also includes a sixth link and a seventh link. The sixth link is rotatably connected to both the third and seventh links, and the seventh link is also rotatably connected to the support and driven to rotate by the drive mechanism. The third, fifth, and sixth links are coaxially rotatably connected. This further improves the stability of the motion mechanism, allowing the drive mechanism to complete its rotational motion. Different positions can be achieved with unidirectional rotation, eliminating the need for reversing the drive device and resulting in better stability.

[0023] Preferably, to ensure stable operation of the motion mechanism without dead angles, the rotation center at the connection between the third link and the first link is C, the rotation center at the connection between the third link and the fifth link is A, the rotation center at the connection between the fourth link and the second link is D, the rotation center at the connection between the fourth link and the fifth link is B, the rotation center at the connection between the sixth link and the seventh link is P, the rotation center at the connection between the seventh link and the support is O, and the rotation center at the connection between the fifth link and the support is M, and satisfying OP: AP∈[0.1, 0.5], OP: AC=∈[0.1, 0.5], AC=BD, and M is the midpoint of A and B.

[0024] To further avoid affecting air intake, the rotation axes of the fifth and seventh links extend in the left-right direction of the range hood.

[0025] Preferably, the connections between the links are made by pins.

[0026] To facilitate the installation of the transmission mechanism and the constraint transmission mechanism, the bracket includes a first frame, a second frame, and a third frame. The first frame extends vertically, and the fifth connecting rod is rotatably connected to the first frame. The second frame is formed by bending the lower end of the first frame laterally. The first connecting rod and the second connecting rod pass through the second frame respectively and are constrained by the second frame to move vertically up and down. The third frame is formed at the upper end of the first frame and extends in the front-rear direction of the range hood to be directly or indirectly fixed to the housing.

[0027] Preferably, the drive mechanism is mounted on a bracket.

[0028] Preferably, the first smoke guide plate and the second smoke guide plate are closely attached, and when the first smoke guide plate and the second smoke guide plate are at the same height, they are both located below the smoke inlet, thereby forming a whole smoke guide plate. The negative pressure extends outward to the edge of the whole smoke guide plate and the smoke collection hood, improving the edge anti-interference ability and ensuring good shape consistency.

[0029] Compared with existing technologies, the advantages of this utility model are as follows: Based on a range hood with smoke guide plates, this utility model utilizes a single drive mechanism to link two liftable smoke guide plates on both sides via multiple connecting rods. This allows the smoke guide plate on the stir-frying side to partially open, resulting in a larger or fully open air intake area, ensuring concentrated flow and negative pressure at the main intake. Conversely, on the other side, it is partially or fully closed, reducing the corresponding flow area and increasing the relative resistance on that side. This reduces pressure relief and flow distribution, resulting in a significantly improved smoke extraction effect compared to ordinary range hoods without two smoke guide plates at the same airflow. This achieves a low-cost range hood product with enhanced anti-interference capabilities. Furthermore, the single-drive multi-link mechanism, arranged longitudinally, saves space compared to traditional multi-push-rod separate drives, and is less likely to affect the overall size, airflow, and intake efficiency, thus reducing costs and making it unaffected by harsh environments such as oil fumes. The seven connecting rods further improve the stability of the motion mechanism, allowing the drive mechanism to rotate completely. Different positions can be achieved with unidirectional rotation, eliminating the need for reversing the drive device and improving stability. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the range hood in its first state according to an embodiment of the present invention;

[0031] Figure 2 This is a cross-sectional view of the range hood in the first state according to an embodiment of the present utility model;

[0032] Figure 3This is a schematic diagram of the smoke guide plate assembly and its motion mechanism when the range hood is in the first state according to an embodiment of the present utility model;

[0033] Figure 4 This is a schematic diagram of the range hood in the second state according to an embodiment of the present invention;

[0034] Figure 5 This is a cross-sectional view of the range hood in the second state according to an embodiment of the present utility model;

[0035] Figure 6 This is a schematic diagram of the smoke guide plate assembly and its motion mechanism of the range hood in the second state according to an embodiment of the present invention.

[0036] Figure 7 This is a schematic diagram of the range hood in the third state according to an embodiment of the present utility model;

[0037] Figure 8 This is a cross-sectional view of the range hood in the third state according to an embodiment of the present utility model;

[0038] Figure 9 This is a schematic diagram of the smoke guide plate assembly and its motion mechanism when the range hood of this utility model is in the third state. Detailed Implementation

[0039] 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.

[0040] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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 utility model 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.

[0041] See Figures 1-3A type of top-mounted range hood includes a smoke collection hood 1 and a housing 2 mounted on top of the smoke collection hood 1. A fan 3 is installed inside the housing 2; alternatively, the fan 3 can be mounted on the ceiling, and does not necessarily have to be inside the housing 2. The smoke collection hood 1 has a smoke inlet 11 located at the connection point with the housing 2, allowing cooking fumes to enter the housing 2 through the smoke inlet 11 as they rise, and then be exhausted by the fan 3. The bottom of the smoke collection hood 1 is recessed upwards to form a smoke collection chamber 12, and the smoke inlet 11 is located at the top of the smoke collection chamber 12.

[0042] The range hood also includes a smoke guide plate assembly, which comprises a first smoke guide plate 41 and a second smoke guide plate 42 arranged side by side. In this embodiment, the first smoke guide plate 41 is located to the left of the second smoke guide plate 42, and their positions can be interchanged. Preferably, the two plates can be pressed tightly together (leaving only a movement gap). The range hood also includes a motion mechanism for driving the smoke guide plate assembly. The motion mechanism includes a drive mechanism 51 and a transmission mechanism. The two smoke guide plates share one drive mechanism 51, and the transmission mechanism adopts a multi-link combination. Specifically, the transmission mechanism includes a first link 521, a second link 522, a third link 524, a fourth link 525, a fifth link 526, and a seventh link 527. The first link 521 and the second link 522 extend vertically, one above the other. The lower end of the first link 521 is fixed to the first smoke guide plate 41, and the lower end of the second link 522 is fixed to the second smoke guide plate 42. The first link 521 and the second link 522 can be connected to the ends of the respective smoke guide plates near the other smoke guide plate 42. One end of the third link 523 is rotatably connected to the upper end of the first link 521, and the other end of the third link 523 is rotatably connected to one end of the sixth link 526. The other end of the sixth link 526 is rotatably connected to one end of the seventh link 527. One end of the fifth link 525 is connected to the junction of the third link 523 and the sixth link 526, and the three are coaxially rotatably connected. The other end of the fifth link 525 is connected to one end of the fourth link 524, and the other end of the fourth link 524 is rotatably connected to the upper end of the second link 522. Preferably, the rotation axes of the third link 523, the sixth link 526, the seventh link 527, the fifth link 525, and the fourth link 524 all extend in the left-right direction to reduce the space occupied in each direction and thus minimize airflow. The connections of the links can be achieved using pins 54.

[0043] The motion mechanism also includes a support 53, which is directly or indirectly fixed inside the housing 2. The support 53 includes a first frame 531, a second frame 532, and a third frame 533. The first frame 531 extends vertically, and a fifth link 525 is rotatably connected to the first frame 531. The two are directly connected by a pin 54, thereby defining the rotation center and position of the fifth link 525. The second frame 532 is formed by a lateral bend at the lower end of the first frame 531. The first link 521 and the second link 522 pass through the second frame 532 respectively and are constrained by the second frame 532 to move only vertically. The third frame 533 is formed at the upper end of the first frame 531 and extends in the front-rear direction for direct or indirect fixation to the housing 2. A drive mechanism 51 can be mounted on the support 53.

[0044] The seventh link 527 is driven to rotate by the drive mechanism 51 (the seventh link 527 rotates on a fixed axis, with its rotation center at the connection point with the bracket 53). Through the transmission of other links, the first link 521 and the second link 522 move vertically up and down (lift and lower). The first link 521 and the second link 522 move in opposite directions simultaneously; for example, when the first link 521 rises, the second link 522 falls. By controlling the rotation angle and direction of the seventh link 527, different lifting and lowering strokes of the first link 521 and the second link 522 can be controlled, thereby moving the first smoke guide plate 41 and the second smoke guide plate 42 to the desired positions.

[0045] The rotation center at the connection between the third link 523 and the first link 521 is C; the rotation center at the connection between the third link 523 and the sixth link 526 is A; the rotation center at the connection between the sixth link 526 and the seventh link 527 is P; the rotation center at the connection between the seventh link 527 and the bracket 53 is O; the rotation center at the connection between the fourth link 524 and the second link 522 is D; and the rotation center at the connection between the fourth link 524 and the fifth link 525 is B. When selecting these rotation centers, the rotation centers at both ends of the same link are located on the same vertical plane extending along the front-back direction of the range hood. To ensure stable operation of the transmission mechanism without dead angles, preferably, OP (representing the length between the two rotation centers, the same below): AP∈[0.1, 0.5], more preferably 0.2; AC=BD, and OP: AC=∈[0.1, 0.5], more preferably also 0.2; the rotation center at the connection between the fifth link 525 and the bracket 53 is M, located at the midpoint of A and B.

[0046] The connecting rods are connected by pins 54 or hinges, forming a pure rotating connection pair. They are not affected by harsh environments such as oil fumes, improving motion reliability and precision, reducing jamming caused by lubrication loss or dirt accumulation, and have a long service life. They are also highly precise and do not have the left-right swaying of the smoke guide plate assembly caused by the ball joint clearance of guide rails.

[0047] See Figures 1-3 The first smoke guide plate 41 and the second smoke guide plate 42 are at the same horizontal position (same height) and are located below the smoke inlet 11. Both sides of the smoke inlet 11 are open. At this time, it corresponds to the situation of turning off or the cooking state on both sides being the same. The two smoke guide plates form a large smoke guide plate. The oil fumes are drawn in from all sides of the whole formed by the two smoke guide plates. The negative pressure is similar to the ring suction of an ordinary smoke guide plate. The negative pressure expands outward to the edge of the plate and the smoke collection hood 1, improving the edge anti-interference ability and the shape consistency is good.

[0048] See 4~ Figure 6 In contrast Figures 1-3 In the first state shown, the drive mechanism 51 drives the seventh link 527 counterclockwise. Figure 3 The direction shown in the view is rotated, causing the first smoke guide plate 41 to move upward from the first state, closing the left side of the smoke inlet 11, while the second smoke guide plate 42 moves downward from the first state, further opening the right side of the smoke inlet 11, corresponding to single-sided (right-side) cooking. If it is single-sided cooking on the left side, only the seventh link 527 needs to be rotated in the opposite direction.

[0049] See 7~ Figure 9 In contrast Figures 1-3 The first state shown indicates that the cooking states on both sides are inconsistent, but both require cooking with pots and pans. This allows the side with high smoke production (left side in the diagram) to switch to a high air intake state, while the other side (right side in the diagram) is in a low air intake state. This state can also be switched to when there is interference, increasing airflow in the main area and reducing interference. This allows for airflow adjustment based on the cooking situation. The drive mechanism 51 drives the seventh link 527 clockwise. Figure 3 The direction shown in the view is rotated, causing the first smoke guide plate 41 to move downward from its first state, further opening the left side of the smoke inlet 11, while the second smoke guide plate 42 moves upward from its first state, reducing its distance from the right side of the smoke inlet 11 without closing it. If there is a small air intake on the left and a large air intake on the right, only the seventh link 527 needs to be rotated in the opposite direction.

[0050] This invention, based on a range hood with smoke guide plates, utilizes a single drive mechanism to link two liftable smoke guide plates on both sides via multiple connecting rods. This allows for partial or full opening of the smoke guide plate on the stir-frying side during high-intensity cooking, ensuring concentrated airflow and negative pressure at the main intake. Conversely, on the other side, the smoke guide plate is partially or fully closed, reducing the corresponding flow area and increasing relative resistance. This reduces pressure relief and flow distribution, resulting in significantly improved smoke extraction compared to ordinary range hoods without smoke guide plates at the same airflow volume. This provides a low-cost range hood with enhanced anti-interference capabilities. Furthermore, it can be combined with side airflow detection, infrared sensors, and smoke detectors for automatic control. Similar control methods can be found in Chinese patent applications 202110740810.0, 202121483515.3, and 202110740720.1, and this invention achieves similar control.

Claims

1. A range hood, comprising: a hood (1) having an inlet opening (11) formed thereon; a cabinet (2) connected to the hood (1); a baffle assembly including a first baffle (41) and a second baffle (42) arranged side by side along a left-right direction of the range hood; and a moving mechanism for driving the first baffle (41) and the second baffle (42) to move up and down to open and close a corresponding portion of the inlet opening (11); characterized in that: the moving mechanism includes a driving mechanism (51), a transmission mechanism, and a bracket (53) fixedly arranged in the cabinet (2), the transmission mechanism including: a first link (521) connected to the first baffle (41) to move up and down synchronously; a second link (522) connected to the second baffle (42) to move up and down synchronously; a third link (523) rotationally connected to the first link (521); a fourth link (524) rotationally connected to the second link (522); a fifth link (525) rotationally connected to the third link (523) and the fourth link (524), respectively, and rotationally connected to the bracket (53) at a position between the connection positions of the third link (523) and the fourth link (524), such that the first link (521) and the second link (522) move in opposite directions.

2. The hood according to claim 1, characterized in that: a center of rotation of the third link (523) at the connection position with the first link (521) is C, a center of rotation of the third link (523) at the connection position with the fifth link (525) is A, a center of rotation of the fourth link (524) at the connection position with the second link (522) is D, a center of rotation of the fourth link (524) at the connection position with the fifth link (525) is B, a center of rotation of the fifth link (525) at the connection position with the bracket (53) is M, and AC = BD, M is the midpoint of A and B.

3. The hood according to claim 1, characterized in that: the transmission mechanism further includes a sixth link (526) and a seventh link (527), the sixth link (526) is rotationally connected to the third link (523) and the seventh link (527), respectively, the seventh link (527) is further rotationally connected to the bracket (53) and is driven to rotate by the driving mechanism (51), and the third link (523), the fifth link (525), and the sixth link (526) are coaxially rotationally connected.

4. The hood according to claim 3, characterized in that: The rotation center of the third connecting rod (523) at the connection with the first connecting rod (521) is C, the rotation center of the third connecting rod (523) at the connection with the fifth connecting rod (525) is A, the rotation center of the fourth connecting rod (524) at the connection with the second connecting rod (522) is D, the rotation center of the fourth connecting rod (524) at the connection with the fifth connecting rod (525) is B, the rotation center of the sixth connecting rod (526) at the connection with the seventh connecting rod (527) is P, the rotation center of the seventh connecting rod (527) at the connection with the bracket (53) is O, the rotation center of the fifth connecting rod (525) at the connection with the bracket (53) is M, and OP: AP∈[0.1, 0.5], OP: AC∈[0.1, 0.5], AC=BD, and M is the midpoint of A and B.

5. The hood according to claim 3, characterized in that: The rotation axes of the fifth connecting rod (525) and the seventh connecting rod (527) extend in the left-right direction of the range hood.

6. The hood according to claim 1, characterized in that: The connections between the connecting rods are connected by pins (54).

7. The hood according to claim 1, characterized in that: The bracket (53) includes a first bracket body (531), a second bracket body (532), and a third bracket body (533). The first bracket body (531) extends up and down, the fifth connecting rod (525) is rotationally connected with the first bracket body (531), the second bracket body (532) is formed by transversely bending the lower end of the first bracket body (531), the first connecting rod (521) and the second connecting rod (522) pass through the second bracket body (532) and are constrained by the second bracket body (532) to move vertically up and down, and the third bracket body (533) is formed at the upper end of the first bracket body (531) and extends in the front-rear direction of the range hood to be directly or indirectly fixed with the cabinet (2).

8. The hood according to claim 1, characterized in that: The driving mechanism (51) is mounted on the bracket (53).

9. The hood according to claim 1, characterized in that: The first smoke guide plate (41) and the second smoke guide plate (42) are close together, and both are located below the smoke inlet (11) at the same height.

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