A range hood

Abstract

The present invention discloses a range hood, comprising a fixed upper housing, a middle housing, and a lower housing capable of rising and falling relative to the upper housing, wherein the upper housing and the middle housing are sleeved together, and the middle housing and the lower housing are sleeved together, and an air inlet is provided on the front side of the lower housing; the range hood also comprises a motion mechanism for driving the middle housing and the lower housing to rise and fall, wherein the motion mechanism comprises a connecting rod assembly, wherein the connecting rod assembly connects the upper housing, the middle housing, and the lower housing, and the driving mechanism further comprises a driving module for driving the connecting rods of the connecting rod assembly to rotate, thereby driving the middle housing and the lower housing to rise and fall. Compared with the prior art, the advantages of the present invention are that: by using the connecting rod assembly to transmit the power between the three housings, a guide mechanism is no longer required for guidance, thereby avoiding the problem of poor synchronization accuracy caused by the guide mechanism, improving the synchronization during the lifting movement, and the motion mechanism only requires a driving module and a connecting rod, resulting in a simple structure.

Description

Technical Field

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

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate based on the principles of fluid dynamics, using a centrifugal fan installed inside the hood to draw in and exhaust cooking fumes, while a filter removes some grease particles. A centrifugal fan consists of a volute, an impeller mounted within the volute, and a motor that drives the impeller. As the impeller rotates, negative pressure is generated at the fan's center, drawing cooking fumes from beneath the hood into the fan. After being accelerated by the fan, the volute collects them and guides them out of the room.

[0003] The change in the working form of the range hood can achieve both the oil fume extraction effect when working and the simplicity and beauty when turned off. The lifting range hood is an important direction of the shape change. For example, the Chinese patent application number 202010123977.8 of the applicant discloses a range hood, which includes a fan frame and a first air inlet body and a second air inlet body that can be lifted and lowered relative to the fan frame. The first air inlet body includes a first box body and a first air inlet opened on the front side of the first box body. The second air inlet body includes a second box body and a smoke baffle arranged on the front side of the second box body. The first air inlet body is inserted into the second air inlet body, and the first air inlet body and the second air inlet body are both connected to the fan frame.

[0004] This range hood, by providing a separate first air inlet body with a first air inlet and a second air inlet body with a smoke shield, achieves both concealment when the range hood is not in operation and good fume extraction performance when in operation. However, this range hood suffers from drawbacks such as a complex motion mechanism and poor synchronization accuracy between the two sides due to the use of guide rails, requiring further improvement. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a range hood in view of the above-mentioned deficiencies in the prior art, which reduces the use of guide rails, improves the synchronization of the movements on both sides of the lifting and lowering, and simplifies the structure.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a range hood comprising a fixed upper box, a middle box and a lower box that can be raised and lowered relative to the upper box, the upper box and the middle box being sleeved together, the middle box and the lower box being sleeved together, and an air inlet being provided on the front side of the lower box; the characteristics are:

[0007] The range hood also includes a motion mechanism for driving the middle box and the lower box to rise and fall. The motion mechanism includes a connecting rod assembly, which connects the upper box, the middle box and the lower box. The driving mechanism also includes a driving module for driving the connecting rods of the connecting rod assembly to rotate, thereby driving the middle box and the lower box to rise and fall.

[0008] By using a connecting rod assembly for transmission between the three boxes, a guide mechanism is no longer used for guidance, avoiding the problem of poor synchronization accuracy caused by the guide mechanism, improving the synchronization during lifting movement, and the motion mechanism only requires a drive module and a connecting rod, with a simple structure.

[0009] In order to realize the connection between the three boxes and facilitate the lifting and lowering movement at the hinge points of each box through the rotation of the connecting rod, the connecting rod assembly includes a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod is hinged to the upper box, the other end of the first connecting rod is hinged to one end of the second connecting rod, the other end of the second connecting rod is hinged to one end of the third connecting rod, the other end of the third connecting rod is hinged to the lower box, and the part between the two ends of the second connecting rod is also hinged to the middle box;

[0010] The first link, the second link and the third link are combined into two groups, and the two groups are arranged at intervals on the left and right, and the rotation axis of each link extends in the front-rear direction.

[0011] In order to avoid the movement stroke and speed on both sides of the middle box and the lower box, and further improve the synchronization of movement on both sides, the two hinge points of the connecting rod assembly and the upper box are respectively recorded as A and B, the two hinge points of the connecting assembly and the middle box are respectively recorded as E and F, and the two hinge points of the connecting rod assembly and the lower box are respectively recorded as J and K. The distance between the two hinge points on each box is equal, the hinge points of the two groups of first connecting rods and second connecting rods are respectively recorded as C and D, and the hinge points of the two groups of second connecting rods and third connecting rods are respectively recorded as G and H. The length of each connecting rod satisfies: CE=DF=AC=BD, EG=FH=JG=KH.

[0012] To ensure that the movement of the middle box and the lower box is translational, the connecting rod assembly further includes a fourth connecting rod and a fifth connecting rod. The two ends of the fourth connecting rod are hinged to C and D respectively, and the two ends of the fifth connecting rod are hinged to G and H respectively.

[0013] Furthermore, the connecting rod assembly further includes a sixth connecting rod, a seventh connecting rod and an eighth connecting rod, one end of the sixth connecting rod is hinged at B, the other end of the sixth connecting rod is hinged to one end of the seventh connecting rod and the hinge point is marked as M, the other end of the seventh connecting rod is hinged to one end of the eighth connecting rod and the hinge point is marked as N, and the other end of the eighth connecting rod is hinged to K;

[0014] The sixth link is equal in length to the first link, the seventh link is equal in length to the second link, the eighth link is equal in length to the third link, the portion between the two ends of the seventh link is also hinged to F, and the lengths of the various links satisfy MF=BM, FN=NK.

[0015] Through the above three connecting rods, the translational motion of each box can be constrained to linear motion, and the centers of the three boxes are always aligned, so that there is no need for guide rails to constrain the motion in the range hood, and the problem of low synchronization accuracy on the left and right sides of the guide rail solution is completely solved.

[0016] Furthermore, the driving module includes a driving mechanism and a winding drum driven to rotate by the driving mechanism, and the winding drum is provided with two winding wheels that can rotate relative to the winding drum, and the rotation axes of the winding drum and the winding wheels extend forward and backward. The driving rope is wound into one of the winding wheels and arranged in an S shape before being wound out from the other winding wheel. The two ends of the driving rope are respectively connected to two diagonal points that are closer to each other in a parallelogram formed by four hinge points C, G, H and D.

[0017] The length of the driving ropes at both ends can be adjusted by winding drums to solve the speed difference caused by swinging and further improve the synchronization of movement on both sides.

[0018] Furthermore, the output end of the drive mechanism is connected to the winding drum via a torsion spring, the two free ends of which are fixed to the output shaft and the winding drum, respectively. Using the torsion spring as an energy storage element can achieve the following benefits: ① balancing some loads, reducing the work required by the drive mechanism; and ② smoother application of driving force, ensuring stable movement without start-stop shock.

[0019] Furthermore, in order to change the lifting stroke of the middle box body and the lower box body, at least one connecting rod is provided with at least two hinge holes arranged at intervals along the length direction of the corresponding connecting rod.

[0020] Compared with the prior art, the advantages of the present invention are: by adopting a connecting rod assembly to transmit the power between the three boxes, a guide mechanism is no longer used for guidance, thus avoiding the problem of poor synchronization accuracy caused by the guide mechanism, improving the synchronization during lifting and lowering movements, and the motion mechanism only requires a drive module and a connecting rod, and the structure is simple; through the sixth, seventh and eighth connecting rods, the translational motion of each box can be constrained to linear motion, and the centers of the three boxes are always aligned, so that the range hood does not need a guide rail to constrain the motion, and completely solves the problem of low synchronization accuracy on the left and right sides of the guide rail solution; the line length of the driving rope at both ends is adjusted by the winding drum, which solves the speed difference caused by the swing and further improves the synchronization of the movement on both sides; using the torsion spring as an energy storage element, it can play the following roles: ① Balancing part of the load and reducing the work done by the driving mechanism; ② Applying the driving force is smoother, the movement is stable and there is no start-stop impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a range hood according to a first embodiment of the present invention (in an ascending state);

[0022] Figure 22 is a cross-sectional view of the range hood according to the first embodiment of the present invention (in an ascending state);

[0023] Figure 3 Schematic diagram of a range hood drive module according to a first embodiment of the present invention (with the drive rope hidden);

[0024] Figure 4 Schematic diagram of a range hood drive module according to a first embodiment of the present invention (with the drive rope hidden);

[0025] Figure 5 Schematic diagram of the range hood according to the first embodiment of the present invention (in descending state);

[0026] Figure 6 1 is a cross-sectional view of the range hood according to the first embodiment of the present invention (in a descending state);

[0027] Figure 7 2 is a cross-sectional view of a range hood according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features.

[0030] Example 1

[0031] See also Figures 1 to 5 A range hood comprises an upper box body 1, a middle box body 2 and a lower box body 3, wherein the upper box body 1 is fixed and cannot move, such as being fixed on a wall, and a fan (not shown) is installed inside the upper box body or is connected to other boxes with fans.

[0032] The middle housing 2 and lower housing 3 can each move up and down relative to the upper housing 1, but at different speeds. This difference in speed allows the range hood to be turned on and off, ensuring a simple and aesthetically pleasing shutdown state while maintaining optimal fume extraction during operation. For example, as described in the background, an air inlet 31 is provided on the front side of the lower housing 3, and a fixed smoke shield (not shown) is provided at the bottom front of the middle housing 2.

[0033] The upper and middle boxes 1 and 2 are sleeved together, and the middle and lower boxes 2 and 3 are sleeved together. In this embodiment, the middle box 2 is sleeved outside the upper and lower boxes 1 and 3. The lower end of the upper box 1 extends from the upper end of the middle box 2 into the middle box 2, and the upper end of the lower box 3 extends from the lower end of the middle box 2 into the middle box 2. Alternatively, the upper and lower boxes 1 and 3 can be sleeved outside the middle box 2.

[0034] The range hood further includes a motion mechanism for driving the middle housing 2 and the lower housing 3 to rise and fall, the motion mechanism including a drive module 41 and a connecting rod assembly, wherein the connecting rod assembly includes a first connecting rod 421, a second connecting rod 422, and a third connecting rod 423, one end of the first connecting rod 421 being hinged to the upper housing 1, the other end of the first connecting rod 421 being hinged to one end of the second connecting rod 422, the other end of the second connecting rod 422 being hinged to one end of the third connecting rod 423, the other end of the third connecting rod 423 being hinged to the lower housing 3, and the portion between the two ends of the second connecting rod 422 being also hinged to the middle housing 2. The above-mentioned connecting rod combination has two groups, and the two groups are arranged at intervals on the left and right, and the rotation axis of each connecting rod extends in the front-to-back direction. Alternatively, other connecting rod assemblies that can achieve lifting and falling in the prior art may also be used, such as cross-arranged connecting rod groups.

[0035] The hinge points of the connecting rod assembly and the upper housing 1 are marked A and B, the hinge points of the connecting rod assembly and the middle housing 2 are marked E and F, and the hinge points of the connecting rod assembly and the lower housing 3 are marked J and K. The distance between the two hinge points on each housing is equal, set to a. The hinge points of the first connecting rod 421 and the second connecting rod 422 are marked C and D, respectively, and the hinge points of the second connecting rod 422 and the third connecting rod 423 are marked G and H, respectively.

[0036] The two first links 421 are of equal length (referring to the distance between the hinge points; the term "link length" below shall have the same meaning). The two second links 422 are of equal length (the distance between the hinge points of the first and third links 421 and 423). The two third links 423 are of equal length. Furthermore, the lengths CE = DF = AC = BD, and EG = FH = JG = KH. The link assembly also includes a fourth link 424 and a fifth link 425. The fourth link 424 is hinged at both ends at C and D, respectively. The fifth link 425 is hinged at both ends at G and H, respectively. Both links also have a length of a.

[0037] Through the connecting rods above the connecting rod assembly, it can be ensured that the movement between the boxes is a translational movement.

[0038] The connecting rod assembly also includes a sixth connecting rod 426, a seventh connecting rod 427, and an eighth connecting rod 428. One end of the sixth connecting rod 426 is hinged at B, and the other end is hinged to one end of the seventh connecting rod 427 at a hinge point M. The other end of the seventh connecting rod 427 is hinged to one end of the eighth connecting rod 428 at a hinge point N. The other end of the eighth connecting rod 428 is hinged to K. The sixth connecting rod 426 is the same length as the first connecting rod 421, the seventh connecting rod 427 is the same length as the second connecting rod 422, and the eighth connecting rod 428 is the same length as the third connecting rod 423. The portion between the ends of the seventh connecting rod 427 is also hinged at F. The lengths MF = BM, and FN = NK.

[0039] The addition of the sixth connecting rod 426, the seventh connecting rod 427 and the eighth connecting rod 428 can constrain the above-mentioned translational motion into linear motion, and the centers of the three boxes are always aligned, so that there is no need for guide rails to constrain the motion in the range hood, and the problem of low synchronization accuracy on the left and right sides of the guide rail solution is completely solved.

[0040] The drive module 41 includes a drive mechanism 411, a winding drum 412 and a winding wheel 413. The preferred drive mechanism 411 is a motor that can directly drive one of the connecting rods. In the present embodiment, its output end is connected to the winding drum 412 via a torsion spring 414, and the two free ends of the torsion spring 414 are fixed to the output shaft and the winding drum 412 respectively. The driving torque of the drive mechanism 411 is transmitted through the torsion spring 414, and the winding drum 412 can rotate around the output shaft of the motor. The winding drum 412 is provided with two winding wheels 413 that can rotate relative to the winding drum 412, and the rotation axes of the winding drum 412 and the winding wheel 413 are both extended forward and backward. The drive rope 415 is wound around one of the winding wheels 413 and is wound out from the other winding wheel 413 after being arranged in an S shape. The two ends of the drive rope 415 are respectively connected to the two diagonal points of the CGHD parallelogram that are closer to each other, such as connecting D and G in the present embodiment. The winding wheel 413 ensures that the drive ropes 415 on both sides are always taut and have the same driving force. The addition of the torsion spring 414 has the following effects: 1) balancing part of the load, reducing the work done by the drive mechanism 411; 2) applying the driving force more smoothly, ensuring stable movement without start-stop shock.

[0041] Furthermore, the transmission of driving force by torsion spring 414 effectively resolves the problem of finger pinching during closing. ① The addition of a torsion spring prevents sudden force changes. During the shutdown process, the driving force is slightly greater than the load. Even if finger pinching occurs, the force remains relatively low for a period of time. ② Winding reel 412 can be monitored. When drive mechanism 411 rotates normally and winding reel 412 stops, it can be determined that finger pinching has occurred or the device is fully closed, eliminating the need to use a motor stall and current increase to determine whether finger pinching or shutdown is in place.

[0042] See also Figure 1 and Figure 2 In the initial state, the lower box 3 is retracted into the middle box 2 (as shown in the figure, the lower box 3 is partially exposed from the middle box 2, or the lower box 3 can be completely located in the middle box 2). Figure 5 and Figure 6 , start the driving module 41, and provide driving force to the connecting rod assembly through the driving rope 415, so that the lower box body 3 extends downward from the middle box body 2, and the middle box body 2 descends relative to the upper box body 1 until it reaches the required height.

[0043] In this embodiment, by adopting a connecting rod assembly to perform two-stage lifting linkage, the response is faster, and it can move to the working position faster, meeting the need for quick start and exhaust of oil smoke. The air inlet 31 can extend outward from the middle box 2 when it is opened, so that the smoke exhaust work can be carried out earlier. The flat structural feature of the connecting rod assembly can reduce the encroachment on the oil smoke channel and reduce wind resistance, while being more adaptable to the development needs of ultra-thin range hoods. By changing the relative lengths of the first connecting rod 421, the second connecting rod 422 and the third connecting rod 423 in the connecting rod assembly, the stroke and speed of the middle box 2 and the lower box 3 can be changed (the difference in the length of the connecting rod results in different rotation angles and radii, thereby achieving different speeds).

[0044] Example 2

[0045] See also Figure 7 In this embodiment, the difference from the first embodiment is that at least one connecting rod is provided with at least two hinge holes 429 spaced apart along the length direction of the corresponding connecting rod. Although the hinge hole 429 is only marked on one connecting rod in the figure, it is understood that the hinge holes 429 may be provided on all connecting rods. The hinge positions of the connecting rods are adjusted by the hinge holes based on the respective length relationships in the first embodiment.

[0046] By adjusting the hinge holes 429, the travel (distance between A and E, and between E and J) and speed of the two-stage lift of the middle and lower housings 2 and 3 can be independently varied. Hinged installation requires only pins and screws, making it easy for installers to adjust dimensions based on installation conditions. The use of a connecting rod assembly provides greater flexibility than other drive solutions in two-stage lift range hoods.

[0047] The prerequisites for a two-stage lift range hood to ensure effective fume extraction are: 1. The air inlet is fully open and 2. The appropriate working height. Due to differences in the height of wall cabinets in users' homes and the distance from the countertop, a fixed-stroke range hood cannot meet this requirement. The structure of the connecting rod assembly, however, allows for easy adjustment of the upper and lower lift strokes. By adjusting the position of the hinge point in this manner, the strokes of the two stages can be independently varied, thereby changing the stroke ratio of the two stages. This ensures that after the air inlet 31 is fully extended, it simultaneously moves to a more appropriate working height.

Claims

1. A range hood comprising a fixed upper housing (1), a middle housing (2) and a lower housing (3) capable of rising and falling relative to the upper housing (1), wherein the upper housing (1) and the middle housing (2) are sleeved together, and the middle housing (2) and the lower housing (3) are sleeved together, and an air inlet (31) is provided on the front side of the lower housing (3); characterized in that: The range hood further comprises a motion mechanism for driving the middle box (2) and the lower box (3) to rise and fall, the motion mechanism comprising a connecting rod assembly, the connecting rod assembly connecting the upper box (1), the middle box (2) and the lower box (3), the motion mechanism further comprising a driving module (41) for driving the connecting rods of the connecting rod assembly to rotate, thereby driving the middle box (2) and the lower box (3) to rise and fall; The connecting rod assembly comprises a first connecting rod (421), a second connecting rod (422) and a third connecting rod (423), one end of the first connecting rod (421) is hinged to the upper box body (1), the other end of the first connecting rod (421) is hinged to one end of the second connecting rod (422), the other end of the second connecting rod (422) is hinged to one end of the third connecting rod (423), the other end of the third connecting rod (423) is hinged to the lower box body (3), and the portion between the two ends of the second connecting rod (422) is also hinged to the middle box body (2); The first connecting rod (421), the second connecting rod (422) and the third connecting rod (423) are combined into two groups, and the two groups are arranged at intervals on the left and right, and the rotation axis of each connecting rod extends in the front-to-back direction; The two hinge points between the connecting rod assembly and the upper box (1) are marked as A and B respectively, the two hinge points between the connecting rod assembly and the middle box (2) are marked as E and F respectively, and the two hinge points between the connecting rod assembly and the lower box (3) are marked as J and K respectively. The distance between the two hinge points on each box is equal. The hinge points of the two groups of first connecting rods (421) and second connecting rods (422) are marked as C and D respectively, and the hinge points of the two groups of second connecting rods (422) and third connecting rods (423) are marked as G and H respectively. The length of each connecting rod satisfies: CE=DF=AC=BD, EG=FH=JG=KH; The connecting rod assembly further includes a fourth connecting rod (424) and a fifth connecting rod (425), wherein two ends of the fourth connecting rod (424) are hinged to C and D respectively, and two ends of the fifth connecting rod (425) are hinged to G and H respectively; The driving module (41) comprises a driving mechanism (411) and a winding drum (412) driven to rotate by the driving mechanism (411); the winding drum (412) is provided with two winding wheels (413) capable of rotating relative to the winding drum (412); the rotation axes of the winding drum (412) and the winding wheels (413) both extend forward and backward; a driving rope (415) is wound into one of the winding wheels (413) and is routed in an S-shape before being wound out of the other winding wheel (413); and two ends of the driving rope (415) are respectively connected to two diagonal points that are closer to each other in a parallelogram formed by four hinge points C, G, H and D.

2. The range hood according to claim 1, characterized in that: The connecting rod assembly further includes a sixth connecting rod (426), a seventh connecting rod (427) and an eighth connecting rod (428), one end of the sixth connecting rod (426) is hinged to B, the other end is hinged to one end of the seventh connecting rod (427) and the hinge point is marked as M, the other end of the seventh connecting rod (427) is hinged to one end of the eighth connecting rod (428) and the hinge point is marked as N, and the other end of the eighth connecting rod (428) is hinged to K; The sixth link (426) is of equal length to the first link (421), the seventh link (427) is of equal length to the second link (422), the eighth link (428) is of equal length to the third link (423), and the portion between the two ends of the seventh link (427) is also hinged to F, and the lengths of the links also satisfy MF=BM, FN=NK.

3. The range hood according to claim 1, wherein: The output end of the driving mechanism (411) is connected to the winding drum (412) via a torsion spring (414), and the two free ends of the torsion spring (414) are fixed to the output shaft and the winding drum (412) respectively.

4. The range hood according to any one of claims 1 to 3, characterized in that: At least one connecting rod is provided with at least two hinge holes (429) spaced apart along the length direction of the corresponding connecting rod.

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