Multi-link mechanism and extractor hood

Abstract

This invention relates to the field of range hood technology, specifically disclosing a multi-link mechanism and a range hood. The multi-link mechanism includes a mounting base, a first link, a second link, a third link, a fourth link, and a connecting base. One end of the first link is rotatably connected to the mounting base, the other end of the first link is rotatably connected to the upper end of the second link, and the lower end of the second link is rotatably connected to the connecting base. One end of the third link is connected to a drive assembly for driving the third link to rotate, the other end of the third link is rotatably connected to the upper end of the fourth link, and the lower end of the fourth link is rotatably connected to the connecting base. The second and third links are rotatably connected, with the connection point located between the two ends of the second link and between the two ends of the third link. This invention can reduce the gap between the smoke baffle and the bottom surface of the smoke collection hood when the smoke baffle is in the closed position and the maximum open position.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and in particular to a multi-link mechanism and a range hood. Background Technology

[0002] Range hoods are important electrical appliances in the kitchen used to remove cooking fumes. Most existing range hoods are equipped with a rotatable baffle. This baffle is usually connected to a drive (such as a motor) through a linkage mechanism. The drive drives the linkage mechanism to move, which in turn drives the baffle to rotate between the closed and open positions.

[0003] However, existing linkage mechanisms have significant technical flaws in practical applications: a large gap forms between the smoke baffle and the bottom surface of the smoke collection hood when the baffle is in the closed and fully open positions. This gap presents two problems: firstly, users' fingers can easily get caught in the gap during cleaning or operation, posing a safety hazard; secondly, the large gap allows fumes to easily leak out, reducing the smoke collection effect of the range hood and affecting the user experience. Summary of the Invention

[0004] The present invention provides a multi-link mechanism and a range hood, which can reduce the gap between the smoke baffle and the bottom surface of the smoke collection hood when the smoke baffle is in the closed position and the maximum open position.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] According to a first aspect of the present invention, embodiments of the present invention provide a multi-link mechanism, including a mounting base, a first link, a second link, a third link, a fourth link, and a connecting seat; one end of the first link is rotatably connected to the mounting base, the other end of the first link is rotatably connected to the upper end of the second link, and the lower end of the second link is rotatably connected to the connecting seat; one end of the third link is used to connect to a drive assembly for driving the third link to rotate, the other end of the third link is rotatably connected to the upper end of the fourth link, and the lower end of the fourth link is rotatably connected to the connecting seat; the second link and the third link are rotatably connected at a position between the two ends of the second link and between the two ends of the third link; the axis of rotation of the drive assembly driving the third link is located below the rotation axis of the first link and the mounting base; the connecting seat is used to fix to a smoke baffle, and the connecting seat can drive the smoke baffle to rotate to a closed position and a maximum open position.

[0007] In some embodiments, at least one first limiting rod is also included, which abuts against the first link or the third link to restrict the smoke baffle from rotating in the closing direction when the smoke baffle is in the closed position.

[0008] In some embodiments, a second limiting rod is also included, which abuts against a third link to restrict the smoke baffle from rotating in the opening direction when the smoke baffle is in the maximum open position.

[0009] In some embodiments, the drive assembly includes a rotatable drive rod having a flat portion; it also includes a connecting rod and a stop rod, the stop rod being located inside the end of the third link connected to the drive assembly; the two ends of the connecting rod are respectively connected to the third link and the stop rod; two limiting members are provided between the third link and the stop rod; both the stop rod and the third link have coaxial openings; both limiting members have flat holes adapted to the flat portion; the flat portion passes through the openings of the stop rod and the third link, as well as the flat holes of the two limiting members; and a locking fastener is provided on the connecting rod, the locking fastener being detachably connected to the flat portion.

[0010] In some embodiments, the locking device is a screw, the connecting rod is provided with a through hole, the flat portion is provided with a threaded hole that mates with the through hole, and the screw passes through the through hole and is fixed in the threaded hole.

[0011] In some embodiments, the length of the first link is less than the length of the third link; when the smoke baffle is in the closed position, the second link is located in front of the fourth link, and both the first and third links are inclined relative to the vertical direction, and the height of the first link and the height of the third link gradually increase in the rearward direction.

[0012] According to a second aspect of the present invention, an embodiment of the present invention provides a range hood, including a smoke collection hood, a smoke baffle, a drive assembly, and a multi-link mechanism as described in any one of the first aspects above. The bottom surface of the smoke collection hood is provided with a smoke inlet, the smoke baffle is disposed at the bottom of the smoke collection hood, the drive assembly and the multi-link mechanism are both disposed in the smoke collection hood, the drive assembly is connected to one end of a third link, the mounting base is fixed inside the smoke collection hood, and the connecting base is fixed to the smoke baffle; when the smoke baffle is in the closed position, the smoke baffle covers the smoke inlet.

[0013] In some embodiments, when the smoke baffle is in the closed position, the front end of the smoke baffle is located in front of the front sidewall of the smoke inlet in the front-back direction.

[0014] In some embodiments, when the smoke baffle is in the closed position, in the front-rear direction, the rear end of the smoke baffle is located behind the rear sidewall of the smoke inlet;

[0015] Alternatively, the bottom of the smoke collection hood is provided with a base plate, the smoke inlet is located on the front side of the base plate, and when the smoke baffle is in the closed position, the smoke baffle is located on the front side of the base plate, and a sealing element is fixed on the rear edge of the smoke baffle.

[0016] In some embodiments, the connecting seat is fixedly connected to the front side of the smoke baffle, and when the smoke baffle rotates from the closed position to the maximum open position, the rear end of the smoke baffle rotates forward.

[0017] The present invention has at least the following beneficial effects: When the multi-link mechanism of the present invention is working, the driving component drives the third link to rotate, and the third link then drives the first link, the second link and the fourth link to rotate, thereby driving the connecting seat to make irregular curved motion with the smoke baffle. This can reduce the gap between the smoke baffle and the bottom surface of the smoke collection hood when the smoke baffle is in the closed position and the maximum open position. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a multi-link mechanism according to an embodiment of the present invention when the smoke baffle is in the closed position;

[0019] Figure 2 This is a schematic diagram of the structure of a multi-link mechanism according to an embodiment of the present invention when the smoke baffle is in the maximum open position;

[0020] Figure 3 This is an exploded view of a multi-link mechanism according to an embodiment of the present invention when the smoke baffle is in the closed position;

[0021] Figure 4 This is a schematic diagram of the structure of the third link, connecting rod, stop, and limiting member according to an embodiment of the present invention;

[0022] Figure 5 This is an exploded view of the third link, connecting rod, stop bar, and limiting member according to an embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of a range hood according to an embodiment of the present invention when the smoke baffle is in the closed position;

[0024] Figure 7 This is a schematic diagram of the structure of a range hood according to an embodiment of the present invention when the smoke baffle is in the maximum open position;

[0025] Figure 8 This is a cross-sectional schematic diagram of a range hood according to an embodiment of the present invention when the smoke baffle is in the closed position.

[0026] The attached figures are labeled as follows:

[0027] Connector 100;

[0028] First link 210, second link 220, third link 230, fourth link 240, stop bar 250, opening 251, limit member 260, flat hole 261, locking member 270, connecting rod 280, through hole 281;

[0029] Drive assembly 300, drive rod 310, flat part 311, threaded hole 312;

[0030] Mounting base 400, first limiting rod 410, second limiting rod 420;

[0031] Smoke hood 500, smoke inlet 501, front side wall 502, bottom plate 510;

[0032] Smoke baffle 610, seal 620. Detailed Implementation

[0033] The present invention is provided below with reference to the accompanying drawings to aid in a full understanding of the various embodiments of the invention as defined by the claims and their equivalents. The description includes various specific details to aid understanding, but these details should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the invention.

[0034] In the description of this invention, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0035] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0036] Embodiments of the present invention provide a multi-link mechanism, such as... Figure 1-3As shown, the device includes a mounting base 400, a first connecting rod 210, a second connecting rod 220, a third connecting rod 230, a fourth connecting rod 240, and a connecting seat 100. The mounting base 400 can be part of the smoke hood or an independent device fixed inside the smoke hood. One end of the first connecting rod 210 is rotatably connected to the mounting base 400, the other end of the first connecting rod 210 is rotatably connected to the upper end of the second connecting rod 220, and the lower end of the second connecting rod 220 is rotatably connected to the connecting seat 100. One end of the third connecting rod 230 is connected to the drive assembly 300, which drives the third connecting rod 230 to rotate. The other end of the third connecting rod 230 is rotatably connected to the upper end of the fourth connecting rod 240, and the lower end of the fourth connecting rod 240 is rotatably connected to the connecting seat 100. The second link 220 and the third link 230 are rotatably connected, with the connection point located between the two ends of the second link 220 and the two ends of the third link 230. The axis of rotation of the drive assembly 300, which drives the third link 230, is located below the axis of rotation of the first link 210 and the mounting base 400. The connecting base 100 is used to fix itself to the smoke baffle, thus the connecting base 100 will be linked with the smoke baffle, and the connecting base 100 can drive the smoke baffle to rotate to the closed position and the maximum open position.

[0037] In operation, the multi-link mechanism of this invention allows the drive assembly 300 to rotate the third link 230, which in turn drives the first link 210, second link 220, and fourth link 240 to rotate. This, in turn, drives the connecting seat 100 to move the smoke baffle in an irregular curved motion. This reduces the gap between the smoke baffle and the bottom surface of the smoke collection hood when the smoke baffle is in the closed and fully open positions. When the smoke baffle is in the closed position, the gap between the smoke baffle and the bottom surface of the smoke collection hood can be less than or equal to 7 mm, and when the smoke baffle is in the fully open position, the gap can be less than or equal to 2 mm. During cleaning or operation, users are less likely to insert their fingers into this gap, thus reducing the risk of finger injuries. The smaller gap also prevents oil fumes from leaking out, improving the smoke collection effect of the range hood and enhancing the user experience.

[0038] In some embodiments, such as Figure 1-3 As shown, the multi-link mechanism also includes at least one first limiting rod 410. When the smoke baffle is in the closed position, the first limiting rod 410 abuts against the first link 210 or the third link 230 to restrict the first link 210 or the third link 230 from rotating in the closing direction. The entire multi-link mechanism can no longer move in the closing direction, and the smoke baffle is correspondingly restricted from rotating in the closing direction. This can position the first link 210 or the third link 230, prevent the multi-link mechanism from moving too far in the closing direction, and keep the smoke baffle in the closed position.

[0039] Two first limiting rods 410 can be provided. When the smoke baffle is in the closed position, the two first limiting rods 410 abut against the first connecting rod 210 and the third connecting rod 230 respectively, which has a better limiting effect.

[0040] In some embodiments, such as Figure 1-3 As shown, the multi-link mechanism also includes a second limiting rod 420. When the smoke baffle is in the maximum open position, the second limiting rod 420 abuts against the third link 230 to restrict the third link 230 from rotating in the opening direction. The entire multi-link mechanism can no longer move in the opening direction, and the smoke baffle is restricted from rotating in the opening direction to avoid the smoke baffle opening angle being too large. The smoke baffle can be kept in the maximum open position.

[0041] In some embodiments, such as Figure 3-5 As shown, the drive assembly 300 includes a rotatable drive rod 310, which has a flat portion 311. The multi-link mechanism also includes a connecting rod 280 and a stop rod 250. The stop rod 250 is located inside the end of the third link 230 connected to the drive assembly 300 (the side closest to the drive assembly 300). The two ends of the connecting rod 280 are respectively connected to the third link 230 and the stop rod 250. A space is provided between the third link 230 and the stop rod 250. The device has two limiting members 260. Both the stop bar 250 and the third connecting rod 230 are provided with coaxial openings 251. Both limiting members 260 are provided with flat holes 261 that are adapted to the flat part 311. The flat part 311 passes through the openings 251 of the stop bar 250 and the third connecting rod 230 and the flat holes 261 of the two limiting members 260. The connecting rod 280 is provided with a locking fastener 270, which is detachably connected to the flat part 311.

[0042] Because the limiting member 260 is provided with a flat hole 261, and the flat part 311 passes through the flat hole 261, when the drive rod 310 rotates, it will correspondingly drive the third link 230 to rotate. This structure can limit the rotation of the drive rod 310 relative to the third link 230, so as to effectively transmit the driving force. At the same time, the locking fastener 270 is detachably connected to the flat part 311. The locking fastener 270 can be disassembled as needed, so that the drive rod 310 and the third link 230 can be separated, so as to facilitate the assembly and subsequent maintenance of the entire multi-link mechanism.

[0043] Furthermore, the locking device 270 is a screw, the connecting rod 280 is provided with a through hole 281, the flat part 311 is provided with a threaded hole 312 that mates with the through hole 281, and the screw passes through the through hole 281 and is fixed in the threaded hole 312.

[0044] During the tightening of the screw, the limiting member 260 can gradually approach the connecting rod 280, thereby clamping and fixing the limiting member 260 and the screw head onto the connecting rod 280, thus fixing the drive rod 310 and the third connecting rod 230 together. Using screws for fixing is easy to operate and disassemble.

[0045] In some embodiments, such as Figure 3-5 As shown, the third link 230, the connecting rod 280, and the stop bar 250 can be integrally formed for ease of manufacturing.

[0046] In some embodiments, such as Figure 3-5 As shown, the drive assembly 300 also includes a driver connected to the drive rod 310. The driver is used to drive the drive rod 310 to rotate. The driver includes a motor or other drive components.

[0047] In some embodiments, such as Figure 1-3 As shown, the length of the first link 210 is less than the length of the third link 230; when the smoke baffle is in the closed position, the second link 220 is located in front of the fourth link 240, and both the first link 210 and the third link 230 are inclined relative to the vertical direction. In the rearward direction, the height of the first link 210 and the height of the third link 230 gradually increase.

[0048] This allows the third link 230 to swing with a greater amplitude, thus enabling the third link 230 to push the connecting seat 100 to flip forward, and the smoke baffle to flip forward accordingly, thereby allowing the smoke baffle to open. When the smoke baffle is in the closed position, it can be parallel to the horizontal direction.

[0049] Embodiments of the present invention provide a range hood, such as... Figure 6-8 As shown, the system includes a smoke hood 500, a smoke baffle 610, a drive assembly, and a multi-link mechanism according to any of the above embodiments. Specific details regarding the multi-link mechanism can be found in the above embodiments and will not be repeated here. The bottom surface of the smoke hood 500 has a smoke inlet 501, through which oil fumes can enter the smoke hood 500. The smoke baffle 610 is located at the bottom of the smoke hood 500. The drive assembly and the multi-link mechanism are both located within the smoke hood 500. The drive assembly is connected to one end of the third link 230. The mounting base 400 is fixed inside the smoke hood 500, and the connecting base 100 is fixed to the smoke baffle 610. The drive assembly can drive the multi-link mechanism to move, thereby causing the connecting base 100 to rotate the smoke baffle 610 to the closed position and the maximum open position. When the smoke baffle 610 is in the closed position, it covers the smoke inlet 501.

[0050] In some embodiments, such as Figure 6-8As shown, when the smoke baffle 610 is in the closed position, its front end is located in front of the front sidewall 502 of the smoke inlet in the front-back direction. The smoke baffle 610 effectively expands the covering space in front of the smoke inlet 501, providing better shielding and making it difficult for dust and other impurities to enter the smoke collection hood 500 through the smoke inlet 501.

[0051] Furthermore, two specific implementation methods will be provided.

[0052] In one embodiment, when the smoke baffle 610 is in the closed position, its rear end is located behind the rear sidewall of the smoke inlet 501 in the front-rear direction. The smoke baffle 610 further expands the sealing space behind the smoke inlet 501, and the area of ​​the entire smoke baffle 610 can be larger than the cross-sectional area of ​​the smoke inlet 501, resulting in a better shielding effect on the smoke inlet 501 and making it more difficult for dust and other impurities to enter the smoke collection hood 500 through the smoke inlet 501.

[0053] In another embodiment, the bottom of the smoke hood 500 is provided with a base plate 510, and the smoke inlet 501 is located on the front side of the base plate 510. When the smoke baffle 610 is in the closed position, the smoke baffle 610 is located on the front side of the base plate 510, and a sealing member 620 is fixed to the rear edge of the smoke baffle 610. The sealing member 620 can abut against the base plate 510 or extend to the bottom of the base plate 510. This structure is equivalent to forming a double-plate structure with the smoke baffle 610 and the base plate 510 coexisting at the bottom of the smoke hood 500 to meet the usage needs of different users.

[0054] In some embodiments, such as Figure 6-8 As shown, the connecting seat 100 is fixedly connected to the front side of the smoke baffle 610. When the smoke baffle 610 rotates from the closed position to the maximum open position, the rear end of the smoke baffle 610 rotates forward. In this case, the smoke baffle 610 makes an irregular curved motion. Even if the front end of the smoke baffle 610 is located in front of the front side wall 502 of the smoke inlet in the front direction, the front end of the smoke baffle 610 will not interfere with the smoke collection hood 500 when the smoke baffle 610 rotates.

[0055] The terms and words used in the foregoing description and claims are not limited to their literal meaning, but are merely used by the applicant to enable a clear and consistent understanding of the invention. Therefore, those skilled in the art will understand that the foregoing description of various embodiments of the invention is illustrative only and not intended to limit the invention as defined by the appended claims and their equivalents.

Claims

1. A multi-link mechanism, characterized in that: The system includes a mounting base, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, and a connecting seat. One end of the first connecting rod is rotatably connected to the mounting base, the other end of the first connecting rod is rotatably connected to the upper end of the second connecting rod, and the lower end of the second connecting rod is rotatably connected to the connecting seat. One end of the third connecting rod is connected to a drive assembly, which drives the third connecting rod to rotate. The other end of the third connecting rod is rotatably connected to the upper end of the fourth connecting rod, and the lower end of the fourth connecting rod is rotatably connected to the connecting seat. The second connecting rod and the third connecting rod are rotatably connected at a position between the two ends of the second connecting rod and between the two ends of the third connecting rod. The axis of rotation of the third connecting rod by the drive assembly is located below the axis of rotation of the first connecting rod and the mounting base. The connecting seat is used to fix the system to a smoke baffle plate, and the connecting seat can drive the smoke baffle plate to rotate to a closed position and a maximum open position.

2. The multi-link mechanism according to claim 1, characterized in that: It also includes at least one first limiting rod, which abuts against the first link or the third link to restrict the smoke baffle from rotating in the closing direction when the smoke baffle is in the closed position.

3. The multi-link mechanism according to claim 1, characterized in that: It also includes a second limiting rod, which abuts against the third link when the smoke baffle is in the maximum open position to restrict the smoke baffle from rotating in the opening direction.

4. The multi-link mechanism according to any one of claims 1-3, characterized in that: The drive assembly includes a rotatable drive rod having a flat portion; it also includes a connecting rod and a stop rod, the stop rod being located inside the end of the third link connected to the drive assembly; the two ends of the connecting rod are respectively connected to the third link and the stop rod; two limiting members are provided between the third link and the stop rod; both the stop rod and the third link have coaxial openings; both limiting members have flat holes adapted to the flat portion; the flat portion passes through the openings of the stop rod and the third link, as well as the flat holes of the two limiting members; a locking fastener is provided on the connecting rod, and the locking fastener is detachably connected to the flat portion.

5. The multi-link mechanism according to claim 4, characterized in that: The locking device is a screw, the connecting rod is provided with a through hole, the flat part is provided with a threaded hole that mates with the through hole, and the screw passes through the through hole and is fixed in the threaded hole.

6. The multi-link mechanism according to any one of claims 1-3, characterized in that: The length of the first link is less than the length of the third link; when the smoke baffle is in the closed position, the second link is located in front of the fourth link, and both the first and third links are inclined relative to the vertical direction. In the rearward direction, the height of the first link and the height of the third link gradually increase.

7. A range hood, characterized in that: The device includes a smoke hood, a smoke baffle, a drive assembly, and a multi-link mechanism as described in any one of claims 1-6. The bottom surface of the smoke hood is provided with a smoke inlet, the smoke baffle is disposed at the bottom of the smoke hood, the drive assembly and the multi-link mechanism are both disposed in the smoke hood, the drive assembly is connected to one end of a third link, the mounting base is fixed inside the smoke hood, and the connecting base is fixed to the smoke baffle. When the smoke baffle is in the closed position, the smoke baffle covers the smoke inlet.

8. The range hood according to claim 7, characterized in that: When the smoke baffle is in the closed position, in the front-rear direction, the front end of the smoke baffle is located in front of the front side wall of the smoke inlet.

9. The range hood according to claim 8, characterized in that: When the smoke baffle is in the closed position, in the front-rear direction, the rear end of the smoke baffle is located behind the rear sidewall of the smoke inlet; Alternatively, the bottom of the smoke collection hood is provided with a base plate, the smoke inlet is located on the front side of the base plate, and when the smoke baffle is in the closed position, the smoke baffle is located on the front side of the base plate, and a sealing element is fixed on the rear edge of the smoke baffle.

10. The range hood according to claim 7, characterized in that: The connecting seat is fixedly connected to the front side of the smoke baffle. When the smoke baffle rotates from the closed position to the maximum open position, the rear end of the smoke baffle rotates forward.

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