Range hood

Abstract

The range hood comprises an upper box body assembly, a lower box body assembly and a lower box body assembly, the air inlet body can move relative to the upper box body assembly; the movement mechanism comprises a driving mechanism and a transmission mechanism; the transmission mechanism is a multi-connecting-rod mechanism, the multi-connecting-rod mechanism at least comprises connecting rods which are rotationally connected with each other and connecting rods which are rotationally connected with the upper box body assembly, the air inlet body is rotationally connected with the multi-connecting-rod mechanism through two rotating connecting points, and the number of the connecting rods of the multi-connecting-rod mechanism is N; the sum of the number of the rotary connecting points in the multi-connecting-rod mechanism, the number of the rotary connecting points of the multi-connecting-rod mechanism and the upper box body assembly and the number of the rotary connecting points of the multi-connecting-rod mechanism and the air inlet body is M, and 3N-2M = 1; the upper end of the driving mechanism is rotationally connected with the upper box assembly, the center of the rotational connection position is a third rotational connection point, the lower end of the driving mechanism is an output end capable of outputting linear motion, the output end is rotationally connected with the air inlet body, and the center of the rotational connection position is a fourth rotational connection point.

Description

Technical Field

[0001] The present invention relates to an oil fume purification device, in particular to a range hood. Background Art

[0002] Chinese cooking generates a large amount of oil fume. To keep the kitchen environment clean and protect human health, range hoods have become one of the essential devices in modern family kitchens. As the application rate of range hoods is getting higher and higher, people pay more and more attention to the oil fume extraction effect of range hoods. If the distance between the air inlet of the range hood and the oil fume generation area is large, the suction path of the oil fume is long and the suction time increases, resulting in easy oil fume escape during cooking. If the installation height of the range hood is reduced and the air inlet is as close as possible to the smoke source, with the negative pressure expanding downward, although it is beneficial to improve the oil fume extraction effect, it will cause the cooking space to be too small, and the cook's head is likely to accidentally touch the smoke collecting hood. Moreover, after the installation height is reduced, it also affects the line of sight and the overall appearance of the kitchen.

[0003] For this reason, a liftable range hood has been invented, that is, the air inlet body can be lifted. When the machine is turned on, the air inlet body descends, and when the machine is turned off, the air inlet body rises. For example, a hidden range hood disclosed in a Chinese patent with the application number 202310591483.6 includes a range hood main body, a flipping housing, and a smoke gathering plate. The bottom of the range hood main body has an opening. The flipping housing is rotationally engaged with the range hood main body so that the flipping housing can be flipped into or out of the opening. A flue is formed between the flipping housing and the range hood main body. The flipping housing has a smoking port communicating with the flue. The smoke gathering plate is movably connected to the flipping housing to block or release the smoking port and gather the flue gas below the smoking port. For this kind of range hood, its flipping housing and smoke gathering plate each require an independent driving mechanism for driving, resulting in a complex structure and high cost.

[0004] For this kind of range hood, the flipping housing makes a fixed-axis flipping movement relative to the range hood main body without a guiding mechanism. Although to a certain extent, it can compress the stroke when opening and closing, reducing both the descending height and the storage space required for rising, but during the flipping and descending process and in the fully opened state, the rear side of the flipping housing cannot fit the wall surface of the range hood, resulting in oil fume escaping here and even causing oil accumulation and oil dripping on the rear side wall of the range hood.

[0005] In addition, there is also a range hood with a movable smoking hood disclosed in a Chinese patent with the application number 201821250086.3, which includes a main smoking hood and a movable smoking hood. A main smoking cavity is provided inside the main smoking hood. The upper part of the movable smoking hood extends into the main smoking hood. A movable smoking cavity communicating with the main smoking cavity is provided inside the movable smoking hood. A movable smoking port is provided on the outer surface of the movable smoking hood, and the movable smoking port communicates with the movable smoking cavity. The movable smoking hood is vertically movable and swingably engaged with the main smoking hood.

[0006] For this range hood, the movable smoke suction hood flips and lifts, and the hinge point between the movable smoke collecting hood and the main smoke collecting hood can slide along the chute, resulting in the degree of freedom of the movable smoke collecting hood not being 1. Therefore, the upper end of the driving mechanism needs to be fixed to the main smoke collecting hood, and the lower end is hinged to the movable smoke collecting hood. While driving the movement of the movable smoke suction cavity, the driving mechanism also needs to ensure that the hinge point between the driving mechanism and the movable smoke suction cavity moves up and down in a straight line in the vertical direction. That is, when the push rod does not expand or contract, the driving mechanism needs to suppress the swing of the hinge point in the front and rear directions. This restraining force acts on the push rod in the reverse direction, causing the push rod to tend to bend, increasing the wear between the fixed sleeve and the movable rod of the push rod assembly, and reducing the reliability of the push rod assembly.

[0007] Therefore, further improvement is still needed. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a range hood in view of the deficiencies of the above-mentioned prior art, which can avoid the driving mechanism from being subjected to bending force even when the air inlet body swings, and improve the reliability of the driving mechanism.

[0009] The technical solution adopted by the present invention to solve the above technical problems is: a range hood, comprising:

[0010] An upper cabinet assembly;

[0011] An air inlet body, which can move relative to the upper cabinet assembly; and

[0012] A motion mechanism, which includes a driving mechanism and a transmission mechanism;

[0013] It is characterized in that:

[0014] The transmission mechanism is a multi-link mechanism. The multi-link mechanism at least has a link that is rotatably connected to each other and a link that is rotatably connected to the upper cabinet assembly. The air inlet body is directly or indirectly provided with a first rotation connection point and a second rotation connection point. The air inlet body is rotatably connected to the multi-link mechanism through the first rotation connection point and the second rotation connection point respectively. The number of links of the multi-link mechanism is N, and the sum of the number of rotation connection points in the multi-link mechanism, the number of rotation connection points between the multi-link mechanism and the upper cabinet assembly, and the number of rotation connection points between the multi-link mechanism and the air inlet body is M, and it satisfies: 3N - 2M = 1;

[0015] The upper end of the driving mechanism is rotatably connected to the upper cabinet assembly, and the center of the rotation connection is the third rotation connection point. The lower end of the driving mechanism is an output end capable of outputting linear motion, and the output end is rotatably connected to the air inlet body, and the center of the rotation connection is the fourth rotation connection point.

[0016] Due to the number of links in the multi-link mechanism and the setting of the rotational connection points (including those inside the multi-link mechanism and at the connection between the multi-link mechanism and the outside), the degree of freedom of the multi-link mechanism is 1. The air inlet body is rotationally connected to the multi-link mechanism through two rotational connection points, ensuring that the degree of freedom of the air inlet body is also 1. The movement trajectory of the air inlet body can be precisely controlled through the multi-link mechanism. On this basis, the upper and lower ends of the driving mechanism can be rotationally connected to the corresponding upper box assembly and the air inlet body respectively. Thus, when starting up and opening, pushing down the fourth rotational connection point increases the distance between the third rotational connection point and the fourth rotational connection point; when shutting down, pulling up the fourth rotational connection point decreases the distance between the third rotational connection point and the fourth rotational connection point. During this process, the connecting line between the third rotational connection point and the fourth rotational connection point swings back and forth in the front-back direction. The driving mechanism only bears the pushing and pulling force and has no bending load, which is beneficial to increasing the reliability of the driving mechanism.

[0017] Further, to enable the air inlet body to move along the wall, improving space utilization and reducing the risk of smoke leakage, the multi-link mechanism includes a first link. One end of the first link is rotationally connected to the upper box assembly, and the center of the rotational connection is the fifth rotational connection point. The front end of the air inlet body is rotationally connected to the first link through the first rotational connection point, and the first rotational connection point coincides with or is two points from the fifth rotational connection point.

[0018] Further, the fourth rotational connection point is located at the rear end of the air inlet body. The fourth rotational connection point has a lowest point corresponding to its lowest position and a highest point corresponding to its highest position. The trajectory of the fourth rotational connection point moving around the fifth rotational connection point is a curved segment between the lowest point and the highest point. The projection of the fifth rotational connection point on the vertical plane extending in the front-back direction of the range hood where the fourth rotational connection point is located is the projection point. The angle between the line connecting any point on the curved segment and the projection point and the line connecting the point on the curved segment to the third rotational connection point is 90° - θ, and θ ≤ 25°. This can ensure sufficient pushing and pulling force efficiency of the driving mechanism.

[0019] To further meet the required pushing and pulling force efficiency, the maximum distance between the line connecting the lowest point and the third rotational connection point and the point on the curved segment is L. The driving mechanism is an electric push rod, and the driving mechanism includes a push rod. The length of the push rod after complete contraction is M1, and the length of the push rod after complete extension is M2, satisfying: (M1 + M2) / 2 > L / cosθ;

[0020] There are the following line segments between the third rotational connection point, the highest point, and the lowest point: the line connecting the third rotational connection point and the highest point, the line connecting the third rotational connection point and the lowest point, and the line connecting the highest point and the lowest point. The angles between any two of the three line segments are not greater than θ.

[0021] Further, to make the movement of the air inlet body have an appropriate amplitude, the multi-link mechanism further includes a rocker and a second link. One end of the rocker is rotatably connected to the upper box assembly, and the center of the rotatable connection is the sixth rotatable connection point. The second link is rotatably connected to the rocker, and the center of the rotatable connection is the seventh rotatable connection point. The second link is rotatably connected to the first link, and the center of the rotatable connection is the eighth rotatable connection point. The first rotatable connection point is located between the eighth rotatable connection point and the fifth rotatable connection point.

[0022] Further, the connection line between the sixth rotatable connection point and the seventh rotatable connection point is the first straight line, the connection line between the seventh rotatable connection point and the eighth rotatable connection point is the second straight line, and the connection line between the eighth rotatable connection point and the second rotatable connection point is the third straight line. The lengths of the respective connection lines satisfy the following relationship: the first straight line > the second straight line > the third straight line.

[0023] This can avoid the movement range of the air inlet body from being too large, making the space required for its storage smaller, and it will not overly occupy the cooking space when opened.

[0024] Further, the connection line between the eighth rotatable connection point and the first rotatable connection point is the fourth straight line, and the connection line between the first rotatable connection point and the second rotatable connection point is the fifth straight line. The lengths of the respective connection lines satisfy the following relationship: the fourth straight line > the fifth straight line.

[0025] Making the length of the fourth straight line greater than that of the fifth straight line can ensure that there is a sufficient distance between the fifth rotatable connection point and the second rotatable connection point to ensure that the second link has sufficient strength to drive the first link, and at the same time can reduce the movement amplitude of the air inlet body. Preferably, the rotation angle of the air inlet body does not exceed 40°.

[0026] Further, the air inlet body is rotatably connected to the rocker or the second link through the second rotatable connection point.

[0027] Through the further rotatable connection between the air inlet body and the transmission mechanism, it can be ensured that the degree of freedom of movement of the air inlet body is 1, so as to more precisely control the movement of the air inlet body.

[0028] Further, the multi-link mechanism further includes a third link, and the air inlet body is rotatably connected to the rocker through the third link.

[0029] The movement amplitude of the second link being close represents the movement amplitude of the air inlet body. Using a connecting rod instead of the second link to reduce the movement amplitude. To ensure that the movement amplitudes of the second link and the connecting rod (air inlet body) are close, and considering that the connecting rod has to bear the weight of the air inlet body, the length of the connecting rod should be close to the front-to-back depth of the air inlet body. Therefore, the ninth rotatable connection point is selected to be arranged on the rocker. Description of the Drawings

[0030] Figure 1 Schematic diagram of the open state of the range hood according to an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of the open state of the range hood according to an embodiment of the present invention (viewed from the back to the front);

[0032] Figure 3 Cross-sectional view of the open state of the range hood according to an embodiment of the present invention;

[0033] Figure 4 Cross-sectional view of the open state of the range hood according to an embodiment of the present invention (the section is Figure 3 parallel);

[0034] Figure 5 Schematic diagram of the transmission mechanism of the movement mechanism of the range hood according to an embodiment of the present invention;

[0035] Figure 6 Cross-sectional view of the hidden part of the open state of the range hood according to an embodiment of the present invention (the section is Figure 3 parallel);

[0036] Figure 7 Cross-sectional view of the hidden part of the open state of the range hood according to an embodiment of the present invention (the section is Figure 3 parallel);

[0037] Figure 8 Schematic diagram of the closed state of the range hood according to an embodiment of the present invention;

[0038] Figure 9 Cross-sectional view of the closed state of the range hood according to an embodiment of the present invention. Detailed implementation manners

[0039] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where 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 the present invention, 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", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be arranged in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0041] See Figures 1 to 9 , an oil fume exhaust hood, comprising an upper box body assembly 1, an air inlet body 2, a smoke baffle 3 and an oil cup 4.

[0042] Among them, the upper box body assembly 1 includes an outer box body 11 and a fan frame 12 connected to the outer box body 11. The lower end of the fan frame 12 can be partially located inside the outer box body 11, and a fan 6 is arranged inside the fan frame 12.

[0043] The upper box body assembly 1 can be installed in the kitchen cabinet. Since the width of the fan frame 12 usually needs to be adapted to the width of the fan 6, the fan frame 12 does not need to be large. However, since the air inlet body 2 needs to be adapted to the conventional double burners of household use, it needs a larger width. For the above reasons, the upper box body assembly 1 is divided into the outer box body 11 and the fan frame 12. If the optimization of the air inlet efficiency is not considered, an integral upper box body assembly 1 can also be used.

[0044] The air inlet body 2 can move relative to the upper box body assembly 1, and an air inlet 21 is formed on its front surface. When the air inlet body 2 is in the first state, at least the front end of the air inlet body 2 is hidden and received inside the upper box body assembly 1 and is located below the fan. When the air inlet body 2 is in the second state, at least part of the air inlet body 2 is lower than the upper box body assembly 1 and is exposed from the upper box body assembly 1, and it is ensured that the air inlet 21 is lower than the bottom of the upper box body assembly 1 and is exposed from the upper box body assembly 1. The "front surface" of the above-mentioned air inlet body 2 refers to the side facing the user when the air inlet body 2 is in the second state. Alternatively, the air inlet body 2 can also be a plate member. When it is in the second state, at least part of it is located below the upper box body assembly 1. Thus, the oil fume can rise around the periphery of the air inlet body 2 and enter the interior of the upper box body assembly 1 through the opening at the bottom of the upper box body assembly 1 (an opening is required to accommodate at least part of the air inlet body 2).

[0045] The smoke shield 3 is installed at the bottom of the upper box assembly 1 (outer box 11), which can be in an open state and a closed state. Figures 1 to 3 When the air inlet body 2 is in the second state, the smoke baffle 3 is in the open state, and a smoke collecting cavity Q is formed between the smoke baffle 3 and the front side of the air inlet body 2, so that the air inlet 21 is moved downward and the smoke collecting area is increased, thereby ensuring a better oil fume absorption effect in the working state; Figure 8 and Figure 9 When the air inlet body 2 is in the first state, the smoke baffle 3 is in the closed state. The smoke baffle 3 is enclosed at the bottom of the outer box body 11. It can be in a roughly horizontal extension state and can be flush with the bottom of the outer box body 11, achieving a completely flat closed state. At the same time, the air inlet 21 of the air inlet body 2 is closed, and the overall size of the machine is reduced to a minimum.

[0046] The oil cup 4 is arranged at the rear bottom of the air inlet body 2 .

[0047] The range hood also includes a motion mechanism, which includes a drive mechanism 51 and a transmission mechanism. In this embodiment, the drive mechanism 51 adopts an electric push rod, which is installed in the upper box assembly 1, and the output end is transmission-connected to the air inlet body 2, thereby driving the air inlet body 2 to move.

[0048] The transmission mechanism controls the motion of the air inlet 2 and also coordinates with the smoke deflector 3, allowing the air inlet 2 and smoke deflector 3 to move in unison via a single power source (drive mechanism 51). To ensure stable left-right motion of the air inlet 2 and smoke deflector 3, two transmission mechanisms are located on the left and right sides of the upper housing assembly 1 (when the air inlet 2 is in the first state, a portion of the transmission mechanism is exposed). Each transmission mechanism connects the air inlet 2 to the smoke deflector 3.

[0049] Each transmission mechanism includes a multi-link mechanism, and the air inlet body 2 is provided with a first rotation connection point G and a second rotation connection point F (a rotation connection point refers to any point on the axis of the rotation connection shaft used for rotation connection, the same below). The multi-link mechanism has at least links that are rotationally connected to each other and a link that is rotationally connected to the upper box assembly 1. The air inlet body 2 is rotationally connected to the multi-link mechanism through the first rotation connection point G and the second rotation connection point F respectively. The number of links in the multi-link mechanism is N, and the sum of the number of rotation connection points in the multi-link mechanism, the number of rotation connection points between the multi-link mechanism and the upper box assembly 1, and the number of rotation connection points between the multi-link mechanism and the air inlet body 2 is M, and satisfies: 3N-2M=1, thereby making the degree of freedom of the multi-link mechanism 1. This is because each link has 3 degrees of freedom (rotation + movement in two directions), and the rotation connection point can rotate, which limits the movement in two directions. Therefore, the above-mentioned restrictions on the number of links and the number of rotation connection points limit the movement freedom of the multi-link mechanism to 1.

[0050] The upper end of the driving mechanism 51 is rotatably connected to the upper box assembly 1, and the center of the rotation connection is the third rotation connection point J. The output end at the lower end of the driving mechanism 51 can output linear motion, and it is directly rotatably connected to the air inlet body 2, and the center of the rotation connection is the fourth rotation connection point H. Thus, the air inlet body 2 can be driven to perform non-axis-fixed rotation relative to the upper box assembly 1, that is, there is movement in the front-back direction of the range hood and rotation around the axis extending in the left-right direction of the range hood. Preferably, the driving mechanism 51 is an electric push rod, including a motor 511 and a push rod 512. The lower end of the push rod 512 is rotatably connected to the rear bottom of the air inlet body 2, and the rotation connection is located at the central position of the air inlet body 2 in the left-right direction. In this embodiment, N = 5, and the multi-link mechanism includes a first link 525, a second link 521, a connecting rod 522, a third link 523, and a rocker 526. Since the air inlet body 2 and the smoke baffle 3 are linked in this embodiment and in order to avoid some components at the bottom of the upper box assembly 1, the first link 525 is in the form of a crank. If linkage is not required, it can also be a straight rod. One end of the first link 525 is rotatably connected to the upper box assembly 1, and the front end of the air inlet body 2 is also rotatably connected to the first link 525, and the center of the rotation connection is the above-mentioned first rotation connection point G. The center of the rotation connection between the first link 525 and the upper box assembly 1 is denoted as the fifth rotation connection point D. The fifth rotation connection point D is the rotation center of the first rotation connection point G, that is, the first rotation connection point G can rotate around the fifth rotation connection point D. In the figure, the fifth rotation connection point D and the first rotation connection point G are shown as two non-coincident points. Optionally, the fifth rotation connection point D and the first rotation connection point G can also coincide. The multi-link mechanism is conducive to achieving high-precision control. Only through the connection of the links, the linkage between the air inlet body 2 and the smoke baffle 3 and the high-precision control of the movement trajectory can be realized, especially suitable for the scenario where the movement trajectory of the air inlet body 2 is irregular, with a simple structure and low cost. The first link 525 is fixed to the smoke baffle 3 to achieve linkage.

[0051] The upper box assembly 1 serves as the frame of the entire transmission mechanism. There is a sixth rotation connection point A on the upper box assembly 1. One end of the rocker 526 is rotatably connected to the side plate 13 of the upper box assembly 1. The side plate 13 extends in the front-back direction of the range hood, and the center of the rotation connection is the sixth rotation connection point A. The second rotation connection point A is preferably located at the rear top of the side plate 13. There are also two side plates 13 adapted to the transmission mechanism. They can be independent components or part of the outer box 11. The side plates 13 are located inside the left and right side walls of the outer box 11.

[0052] One end of the second link 521 is rotatably connected to the end of the rocker 526 away from the sixth rotational connection point A, and the center of the rotational connection is denoted as the seventh rotational connection point B. The other end of the second link 521 is rotatably connected to the first link 525, and the center of the rotational connection is denoted as the eighth rotational connection point C. The movement locus of the second link 521 preferably approximates the movement locus of the air inlet body 2. The second link 521 can be directly or indirectly connected to the air inlet body 2, and such connection can include fixed connection and movable connection. For example, the second link 521 is fixed to the air inlet body 2, or, for another example, a link is rotatably connected to the air inlet body 2 between the second link 521 and the air inlet body 2 and is slidably connected to the second link 521. In this embodiment, the second link 521 is connected to the air inlet body 2 through the first link 525, and the first rotational connection point G is located between the eighth rotational connection point C and the fifth rotational connection point D and the three rotational connection points do not coincide. Thus, the air inlet body 2 and the smoke baffle 3 can be made to rotate in the same direction. For the convenience of connecting the air inlet body 2 and the first link 525, in this embodiment, it is realized by the connecting rod 522 fixed to the air inlet body 2. The connecting rod 522 extends along the front-back direction of the range hood, and preferably can be fixed to the bottom of the air inlet body 2. The front end of the connecting rod 522 is rotatably connected to the first link 525 through the first rotational connection point G, and the rear end of the connecting rod 522 is close to the rear end of the air inlet body 2. The two connecting rods 522 can extend along the outside (left and right) of the air inlet 21 inside the air inlet body 2 and extend out of the air inlet body 2, and the second rotational connection point F is arranged on the rear end of the connecting rod 522.

[0053] In order to make the degree of freedom of the air inlet body 2 be one, the above-mentioned third link 523 is arranged between the air inlet body 2 and the rocker 526. One end of the third link 523 is rotatably connected to the air inlet body 2, and the center of the rotational connection is the above-mentioned second rotational connection point F. The other end of the third link 523 is rotatably connected to the rocker 526, and the center of the rotational connection is denoted as the ninth rotational connection point E. The ninth rotational connection point E is located between the sixth rotational connection point A and the seventh rotational connection point B. Alternatively, the air inlet body 2 can also be connected to a link located between the fifth rotational connection point D of the rocker 526 and the first link 525.

[0054] The rotational axes of the above-mentioned respective rotational connections all extend along the left-right direction of the range hood. In the above text, "rotatably connected" is preferably a hinge connection, and the "rotational connection point" is the "hinge point".

[0055] The degree of freedom of the above multi-link mechanism is 1, and there are rotational connections at the upper and lower ends of the driving mechanism 51. When starting up, the push rod 512 pushes the fourth rotational connection point H downward, and the distance between the third rotational connection point J and the fourth rotational connection point H increases; when shutting down, the push rod 512 pulls the fourth rotational connection point H upward, and the distance between the third rotational connection point J and the fourth rotational connection point H decreases. During this process, the connecting line between the third rotational connection point J and the fourth rotational connection point H swings back and forth in the front-rear direction.

[0056] When the push rod 512 does not undergo telescopic movement, that is, when the length between the third rotational connection point J and the fourth rotational connection point H does not change, the air inlet body 2 will be fixed. Since the degree of freedom of the multi-link mechanism is 1, the driving mechanism 51 only bears pushing and pulling forces and has no bending load, which is beneficial to increasing the reliability of the driving mechanism 51.

[0057] The fourth rotational connection point H is located at the rear end of the air inlet body 2. The fourth rotational connection point H has a lowest point H' corresponding to the lowest position and a highest point K corresponding to the highest position. The trajectory of the fourth rotational connection point H moving around the fifth rotational connection point D (here, moving around the fifth rotational connection point D means observing the movement trajectory after projecting the fifth rotational connection point D onto the vertical plane extending in the front-rear direction of the range hood where the fourth rotational connection point H is located, and vice versa) is a curve segment H'K between the lowest point H' and the highest point K. Since the distance between the fourth rotational connection point H and the first rotational connection point G (here, when measuring the distance, it means projecting the first rotational connection point G onto the vertical plane extending in the front-rear direction of the range hood where the fourth rotational connection point H is located and then measuring, and vice versa) is much greater than the distance between the first rotational connection point G and the fifth rotational connection point D, the curve segment H'K is approximately an arc segment with the fifth rotational connection point D as the center (the fifth rotational connection point D as the center means the projection of the fifth rotational connection point D onto the vertical plane extending in the front-rear direction of the range hood where the fourth rotational connection point H is located as the center). Preferably, the distance between the fourth rotational connection point H and the first rotational connection point G is 3 times or more the distance between the first rotational connection point G and the fifth rotational connection point D.

[0058] To ensure the highest pushing and pulling force efficiency of the push rod 512 on the fourth rotational connection point H, taking the pulling force as an example here, see Figure 6, the pulling force F3 is decomposed along the trajectory curve into F1 and F2. F2 is the force in the direction of the projection of the fourth rotating connection point H and the fifth rotating connection point D (the projection of the fifth rotating connection point D on the vertical plane extending along the front-back direction of the range hood where the fourth rotating connection point H is located). F1 is the force perpendicular to F2. The angle between F1 and F3 is θ, where θ ≤ 25°. Then the pulling force efficiency is cosθ. If it is preferably required that the pulling force efficiency > 99.5%, then θ < 5°. That is to say, the projection of the fifth rotating connection point D on the vertical plane S extending along the front-back direction of the range hood where the fourth rotating connection point H is located is the projection point D'. The angle between the connection line between any point on the curve segment H'K and this projection point D' and the connection line from the point on the curve segment H'K to the third rotating connection point J is 90° - θ, and θ ≤ 25° is satisfied.

[0059] In addition, to meet the above pulling force efficiency, the maximum distance between the connection line of the lowest point H' and the third rotating connection point J and the point on the curve segment H'K is L. The fully retracted length of the push rod 512 is M1, and the fully extended length of the push rod 512 is M2, satisfying: (M1 + M2) / 2 > L / cosθ. There are the following three line segments between the third rotating connection point J, the highest point K, and the lowest point H': the connection line between the third rotating connection point J and the highest point K, the connection line between the third rotating connection point J and the lowest point H', and the connection line between the highest point K and the lowest point H'. The angles between any two of the three line segments are not greater than θ.

[0060] A decorative plate 14 is provided at the front end of the bottom of the upper cabinet assembly 1. A functional module 15 is provided on the decorative plate 14. The functional module 15 can be, for example, a lighting lamp, which extends along the left-right direction of the range hood, or can be, for example, a camera, an oil fume sensor, etc. The fifth rotating connection point D can be located above the decorative plate 14, and there is a gap between the fifth rotating connection point D and the front end of the upper cabinet assembly 1, that is, the fifth rotating connection point D is not at the very front side of the entire upper cabinet assembly 1. When the air inlet body 2 is in the first state, the first rotating connection point G is located in front of the fifth rotating connection point D, the front end of the air inlet body 2 is located above the decorative plate 14, and the projections of the air inlet body 2 and the functional module 15 on the horizontal plane at least partially overlap. The projection direction is shown by the arrow X in Figure 3 . At this time, the smoke baffle 3 is located behind the decorative plate 14; when the air inlet body 2 is in the second state, the first rotating connection point G is located behind the fifth rotating connection point D, the front end of the air inlet body 2 is located behind the decorative plate 14. At this time, the upper end of the smoke baffle 3 is located below the decorative plate 14 and in front of the functional module 15, and the upper end of the smoke baffle 3 will not extend forward beyond the front end of the decorative plate 14.

[0061] Thus, when the smoke baffle 3 is opened, it will not block the functional module 15, ensuring that the functional module 15 functions properly. Moreover, the smoke baffle 3 can also utilize the decorative plate 14 to function as a smoke baffle, preventing oil fumes from escaping here. The opening and storage of the air inlet body 2 also make full use of this area of the decorative plate 14, further reducing the space occupied inside the upper box assembly 1 during storage. And due to the position setting of the fifth rotation connection point D, when the smoke baffle 3 is opened, its upper end can be under the decorative plate 14 without exceeding the front end of the upper box assembly 1, so as to avoid oil fumes leaking here due to the gap in the front-rear direction between it and the front end of the upper box assembly 1.

[0062] In this embodiment, to simplify the structure, the rotation center of the air inlet body 2 is directly located on the first connecting rod 525. Alternatively, a connecting rod, a crank, a rocker and other rods can be separately provided to set the fifth rotation connection point D and the first rotation connection point G. At this time, the rod is fixed to the first connecting rod 525.

[0063] To prevent the movement range of the air inlet body 2 from being too large, so that the space required for its storage is small and it will not overly occupy the cooking space when opened, while the movement range of the smoke baffle 3 should be much larger than that of the air inlet body 2, enabling it to close at the bottom of the upper box assembly 1 and form a large smoke gathering range when opened. In this embodiment, the swing angle of the air inlet body 2 does not exceed 40°, and the smoke baffle 3 needs to be opened from the horizontal state when shut down to an angle of about 30° - 90° with the vertical direction. Therefore, the connection line between the sixth rotation connection point A and the seventh rotation connection point B is the first straight line AB (the connection line here needs to make the sixth rotation connection point A and the seventh rotation connection point B located on the same cross-section of the rocker 526 along the thickness direction, and the definition of the following connection lines is the same as this), the connection line between the seventh rotation connection point B and the eighth rotation connection point C is the second straight line BC, and the connection line between the eighth rotation connection point C and the fifth rotation connection point D is the third straight line CD. The lengths of the connection lines satisfy the following relationship: the first straight line AB > the second straight line BC > the third straight line CD.

[0064] As described above, the connection line between the eighth rotation connection point C and the fifth rotation connection point D is the third straight line CD. The included angle between the third straight line CD and the horizontal direction is α, and it satisfies: 20° < α ≤ 180°. The first connecting rod 525 moves within this range, which can meet the movement range requirements of the air inlet body 2.

[0065] For the movement of the smoke baffle 3, the fifth rotational connection point D is the fixed-axis point, and the eighth rotational connection point C is the driving point. To reduce the load on the eighth rotational connection point C while ensuring the movement torque of the smoke baffle 3, the length of the third straight line CD needs to be as large as possible to meet the driving structural strength requirements of the relatively heavy smoke baffle 3. For this reason, the distance between the sixth rotational connection point A and the fifth rotational connection point D (i.e., the length of the first straight line AD) should be as large as possible. Therefore, in this embodiment, the sixth rotational connection point A is located at the rear top of the side plate 13, while the fifth rotational connection point D is located at the front bottom of the upper box assembly 1. The cross-section of the side plate 13 (this cross-section is a vertical plane extending in the front-rear direction) is rectangular, and the connection line between the sixth rotational connection point A and the fifth rotational connection point D is approximately the diagonal of the cross-section of the side plate 13. Thus, the cross-section range of the side plate 13 is fully utilized. The cross-section of the side plate 13 (in the up-down height direction and the front-rear depth direction) is consistent with the height of the outer box 11. On the basis that the outer box 11 meets the cabinet depth requirement, the height dimension of the cross-section of the outer box 11 can be minimized as much as possible.

[0066] Since the third straight line CD cannot be too short, that is, there should be a sufficient distance between the eighth rotational connection point C and the fifth rotational connection point D to ensure that the second link 521 has sufficient strength to drive the first link 525. However, this will cause the air inlet body 2 to have too large a movement amplitude and cannot ensure being close to the wall if the second link 521 is directly connected to the air inlet body 2. Therefore, the above-mentioned first rotational connection point G is provided. The connection line between the eighth rotational connection point C and the first rotational connection point G is the fourth straight line CG, and the connection line between the first rotational connection point G and the fifth rotational connection point D is the fifth straight line GD. The lengths of the respective connection lines satisfy the following relationship: the fourth straight line CG > the fifth straight line GD, so as to control the movement amplitude of the air inlet body 2 within a smaller range.

[0067] The connection line between the sixth rotational connection point A and the ninth rotational connection point E is the sixth straight line AE, the connection line between the ninth rotational connection point E and the seventh rotational connection point B is the seventh straight line EB, and the connection line between the ninth rotational connection point E and the second rotational connection point F is the eighth straight line EF. As described above, the movement amplitude of the second connecting rod 521 is close to that of the air inlet body 2. In this embodiment, the connecting rod 522 is used instead of the second connecting rod 521 to reduce the movement amplitude. The second straight line BC, FG (the connection line between the first rotational connection point G and the second rotational connection point F), the third straight line CD, and the eighth straight line EF form a parallelogram. That is, EF and CD should be as equal in length as possible to ensure that the movement amplitudes of the second connecting rod 521 and the connecting rod 522 (air inlet body 2) are close. Considering that the connecting rod 522 needs to bear the weight of the air inlet body 2, the length of the connecting rod 522 should be close to the front-back depth of the air inlet body 2. Therefore, the ninth rotational connection point E is selected to be arranged on the rocker 526. To meet the movement requirements of the connecting rod 522, when the movement amplitude of the first rotational connection point G is limited, it is necessary to ensure the up-and-down amplitude of the second rotational connection point F. The lengths of the respective connection lines satisfy the following relationship: 2 * the seventh straight line EB < the sixth straight line AE < 4 * the seventh straight line EB, and the seventh straight line EB < the eighth straight line EF < 3 * the seventh straight line EB. Beyond this range, the movement amplitude of the connecting rod 522 will be too large or too small. [[ID=**2]]

[0068] Through the setting of the above-mentioned movement mechanism, the air inlet body 2 can rotate non-axisymmetrically (flip) relative to the upper box assembly 1, and its rotation center (the first rotational connection point G) also rotates around the fifth rotational connection point D, while the first connecting rod 525 rotates around the fifth rotational connection point D in a fixed-axis manner, and the smoke baffle 3 can rotate non-axisymmetrically (flip) relative to the upper box assembly 1. When the smoke baffle 3 is in the open state, the eighth rotational connection point C and the first rotational connection point G are located behind the fifth rotational connection point D, and when the smoke baffle 3 is in the closed state, the eighth rotational connection point C and the first rotational connection point G are located in front of the fifth rotational connection point D.

[0069] During the movement of the above-mentioned air inlet body 2, smoke baffle 3, and movement mechanism, when the range hood is opened from the closed state (as shown in Figure 7 ), the output end of the drive mechanism 51 extends downward, the air inlet body 2 flips downward, the rocker 526 rotates backward, and the second connecting rod 521 rotates backward and downward, causing the air inlet body 2 to move backward and flip downward, so that during the opening process of the air inlet body 2, it remains in close contact with the wall surface where the range hood is installed; the second connecting rod 521 also pulls the first connecting rod 525 to flip, causing the smoke baffle 3 to open. When closing, the reverse movement can be performed.

Claims

1. An oil fume extractor, comprising: an upper box body assembly (1); an air inlet body (2), the air inlet body (2) being capable of moving relative to the upper box body assembly (1); and a motion mechanism, which includes a driving mechanism (51) and a transmission mechanism; It is characterized in that: the transmission mechanism is a multi-link mechanism, the multi-link mechanism at least has a link that is rotatably connected to each other and a link that is rotatably connected to the upper box body assembly (1), a first rotation connection point (G) and a second rotation connection point (F) are directly or indirectly provided on the air inlet body (2), the air inlet body (2) is rotatably connected to the multi-link mechanism through the first rotation connection point (G) and the second rotation connection point (F) respectively, the number of links of the multi-link mechanism is N, and the sum of the number of rotation connection points in the multi-link mechanism, the number of rotation connection points between the multi-link mechanism and the upper box body assembly (1), and the number of rotation connection points between the multi-link mechanism and the air inlet body (2) is M, and satisfies: 3N - 2M = 1; the upper end of the driving mechanism (51) is rotatably connected to the upper box body assembly (1) and the center of the rotation connection is the third rotation connection point (J), the lower end of the driving mechanism (51) is an output end capable of outputting linear motion, and the output end is rotatably connected to the air inlet body (2) and the center of the rotation connection is the fourth rotation connection point (H).

2. The range hood according to claim 1, characterized in that: The multi-link mechanism includes a first link (525), one end of the first link (525) is rotatably connected to the upper box body assembly (1) and the center of the rotation connection is the fifth rotation connection point (D), the front end of the air inlet body (2) is rotatably connected to the first link (525) through the first rotation connection point (G), and the first rotation connection point (G) and the fifth rotation connection point (D) coincide or are two points.

3. The range hood according to claim 2, wherein: The fourth rotation connection point (H) is located at the rear end of the air inlet body (2), the fourth rotation connection point (H) has a lowest point (H') corresponding to the lowest position and a highest point (K) corresponding to the highest position, the trajectory of the fourth rotation connection point (H) moving around the fifth rotation connection point (D) is a curved segment (H'K) between the lowest point (H') and the highest point (K), the projection of the fifth rotation connection point (D) on the vertical plane (S) extending in the front-rear direction of the oil fume extractor where the fourth rotation connection point (H) is located is the projection point (D'), and the included angle between the connection line between any point on the curved segment (H'K) and the projection point (D') and the connection line between the point on the curved segment (H'K) and the third rotation connection point (J) is 90° - θ, and satisfies θ ≤ 25°.

4. The range hood according to claim 3, characterized in that: The maximum distance between the connection line of the lowest point (H') and the third rotation connection point (J) and the point on the curved segment (H'K) is L, the driving mechanism (51) is an electric push rod, the driving mechanism (51) includes a push rod (512), the length of the push rod (512) after being completely retracted is M1, the length of the push rod (512) after being completely extended is M2, and satisfies: (M1 + M2) / 2 > L / cosθ; There are the following line segments among the third rotation connection point (J), the highest point (K) and the lowest point (H'): the connection line between the third rotation connection point (J) and the highest point (K), the connection line between the third rotation connection point (J) and the lowest point (H'), and the connection line between the highest point (K) and the lowest point (H'). The included angles between any two of the three line segments are not greater than θ.

5. The range hood according to any one of claims 1 to 3, characterized in that: The multi-link mechanism further includes a rocker (526) and a second link (521). One end of the rocker (526) is rotatably connected to the upper box assembly (1), and the center of the rotation connection is the sixth rotation connection point (A). The second link (521) is rotatably connected to the rocker (526), and the center of the rotation connection is the seventh rotation connection point (B). The second link (521) is rotatably connected to the first link (525), and the center of the rotation connection is the eighth rotation connection point (C). The first rotation connection point (G) is located between the eighth rotation connection point (C) and the fifth rotation connection point (D).

6. The range hood according to claim 5, characterized in that: The connection line between the sixth rotation connection point (A) and the seventh rotation connection point (B) is the first straight line (AB). The connection line between the seventh rotation connection point (B) and the eighth rotation connection point (C) is the second straight line (BC). The connection line between the eighth rotation connection point (C) and the second rotation connection point is the third straight line (CD). The lengths of the connection lines satisfy the following relationship: the first straight line (AB) > the second straight line (BC) > the third straight line (CD).

7. The range hood according to claim 5, wherein: The connection line between the eighth rotation connection point (C) and the first rotation connection point (G) is the fourth straight line (CG). The connection line between the first rotation connection point (G) and the second rotation connection point is the fifth straight line (GD). The lengths of the connection lines satisfy the following relationship: the fourth straight line (CG) > the fifth straight line (GD).

8. The range hood according to claim 5, characterized in that: The air inlet body (2) is rotatably connected to the rocker (526) or the second link (521) through the second rotation connection point (F).

9. The range hood according to claim 8, wherein: The multi-link mechanism further includes a third link (523). The air inlet body (2) is rotatably connected to the rocker (526) through the third link (523).

10. The range hood according to any one of claims 1 to 3, characterized in that: The rotation connection is a hinge connection.

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