Lifting mechanism and range hood provided with same

Abstract

The utility model relates to a lifting mechanism and a range hood provided with the lifting mechanism, the lifting mechanism comprises a driving part, a first synchronizing shaft, a first gear, a first rack, a first connecting rod, a second synchronizing shaft, a third synchronizing shaft, a second connecting rod, a third connecting rod, a lower fixing plate, a fourth connecting rod, a fifth connecting rod, an upper fixing plate and other main components. Through transmission of the connecting rod, the synchronizing shaft, the gear and the rack, the upper fixing plate and the lower fixing plate can do relative lifting motion. The lifting mechanism has the advantages that the lifting mechanism forms an upper parallelogram structure and a lower parallelogram structure through a plurality of connecting rods, a plurality of synchronizing shafts, the upper fixing plate and the lower fixing plate, so that stable lifting is realized; and the lifting body does not incline in the left-right direction and the front-back direction.

Description

Technical Field

[0001] This utility model relates to range hoods, and more particularly to a lifting mechanism and a range hood equipped with the lifting mechanism. Background Technology

[0002] Chinese cooking produces a lot of oil fumes. To maintain a clean kitchen environment and protect human health, range hoods have become an indispensable piece of equipment in modern family kitchens. The height of the negative pressure zone of a range hood directly affects its fume extraction efficiency. If the distance between the range hood's air inlet and the area where the fumes are generated is large, the extraction path of the fumes is longer, increasing the extraction time and making it easier for fumes to escape during cooking. Lowering the installation height of the range hood, while improving the extraction effect, will result in a smaller cooking space, making it easier for the cook's head to accidentally hit the fume hood. Furthermore, a lower installation height also affects visibility and the overall appearance of the kitchen. To address this, people invented liftable range hoods, such as the Chinese invention patent application No. 201310136828.5 (authorization announcement No. CN 104101010A) which discloses "A Range Hood with Manually Liftable Smoke Collection Chamber". This range hood has a movable smoke collection chamber that can be lifted up and down at the rear of the inner cavity of the casing. The top of the movable smoke collection chamber is connected to the lower end of the lifter, and the upper end of the lifter is fixed to the reinforcing rib of the casing. The height of the smoke collection chamber of the range hood can be adjusted arbitrarily during cooking by the control panel to achieve the best smoke extraction effect. For example, the Chinese utility model patent No. 201320075819.5 (authorization announcement No. CN203215771U) discloses a "lifting range hood". This lifting range hood has a flat, ultra-thin smoke hood installed at the bottom of the range hood body. The smoke hood has a main smoke inlet on the front. A lifting mechanism is also set in the body to drive the smoke hood to move up and down. When in use, the smoke hood is lowered to absorb the oil fumes. When not in use, the smoke hood is raised and hidden in the range hood body. Lifting range hoods all have lifting mechanisms installed inside. Conventional lifting mechanisms use a motor to drive a vertical screw for lifting. Some use a motor to drive a steel wire for vertical lifting, and some use chain drive. Some existing lifting mechanisms are usually set inside the fan frame, occupying the oil fume channel. On the one hand, this will affect the performance of the fan and the oil fume absorption effect. On the other hand, the movement of the force center point of the mechanism will cause it to not coincide with the center of the load, which will eventually cause the load movement to be unstable or even tilted. Utility Model Content

[0003] The first technical problem to be solved by this utility model is to provide a lifting mechanism with smooth lifting movement, in light of the above-mentioned existing technology.

[0004] The second technical problem to be solved by this utility model is to provide a range hood with a smooth lifting process and less tendency for the whole machine to tilt, in light of the above-mentioned existing technology.

[0005] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a lifting mechanism, characterized in that it includes:

[0006] Drive components;

[0007] The first synchronous shaft is installed at the output end of the drive unit;

[0008] The first gear is installed at one end of the first synchronous shaft;

[0009] The first rack is horizontally positioned and meshes with the first gear;

[0010] The first connecting rod has two parts, which are respectively located at both ends of the first synchronous shaft. The lower end of the first connecting rod is rotatably connected to the corresponding end of the first synchronous shaft.

[0011] The second synchronous shaft is arranged parallel above the first synchronous shaft, and the upper end of the first connecting rod is rotatably connected to the corresponding end of the second synchronous shaft.

[0012] The third synchronous axis is set parallel to the second synchronous axis and at the same horizontal height, with the third synchronous axis located to the right of the second synchronous axis;

[0013] The second connecting rod consists of two rods arranged horizontally to the left and right. The left end of the second connecting rod is rotatably connected to the corresponding end of the second synchronous shaft, and the right end is rotatably connected to the corresponding end of the third synchronous shaft.

[0014] The third link consists of two parallel links located to the right of the first link. The third link is parallel to the first link on the same side, and the upper end of the third link is rotatably connected to the corresponding end of the third synchronous shaft.

[0015] The lower fixed plate is horizontally set and located below the first synchronous shaft, and the lower end of the third connecting rod is rotatably connected to the lower fixed plate;

[0016] The fourth link consists of two links positioned above the corresponding first link, with the lower end of the fourth link rotatably connected to the corresponding end of the second synchronous shaft.

[0017] The fifth link consists of two links located to the right of the fourth link. The fifth link is parallel to the fourth link on the same side, and the lower end of the fifth link is rotatably connected to the corresponding end of the third synchronous shaft.

[0018] An upper fixing plate is horizontally positioned above the lower fixing plate, and the upper ends of the fourth and fifth connecting rods are rotatably connected to the upper fixing plate.

[0019] Preferably, it further includes a fourth synchronous shaft, which is arranged parallel to the first synchronous shaft and at the same horizontal height. The fourth synchronous shaft is located to the right of the first synchronous shaft, and the lower end of the third connecting rod is installed at the corresponding end of the fourth synchronous shaft.

[0020] To ensure smoother operation of the lifting mechanism, the lifting mechanism also includes:

[0021] The fifth synchronous axis is arranged parallel to the right side of the fourth synchronous axis;

[0022] The second gear is located to the right of the first gear and is installed at one end of the fifth synchronous shaft;

[0023] The second rack is horizontally positioned and meshes with the second gear;

[0024] The linkage rod is fixedly connected between the first rack and the second rack;

[0025] The sixth synchronous axis is arranged parallel to and above the fifth synchronous axis;

[0026] The sixth link has two parts, with the lower end rotatably connected to the corresponding end of the fifth synchronous shaft and the upper end rotatably connected to the corresponding end of the sixth synchronous shaft.

[0027] The seventh link consists of two links positioned above the corresponding sixth link. The lower end of the link is rotatably connected to the corresponding end of the sixth synchronous shaft, and the upper end is rotatably connected to the upper fixed plate.

[0028] Preferably, the fifth synchronous shaft is located at the same horizontal level as the fourth synchronous shaft.

[0029] In a further preferred embodiment, the first rack is located below the first gear, and the second rack is located above the second gear.

[0030] The driving component can have various structures and installation positions. Preferably, the driving component is an electric push rod, which is located between the upper fixed plate and the lower fixed plate, and inside the first link, the second link, the third link, the fourth link and the fifth link.

[0031] The technical solution adopted by this utility model to solve the second technical problem mentioned above is as follows: a range hood, including an upper box and a lower box, characterized in that: the lifting mechanism is installed between the upper box and the lower box, the upper fixing plate of the lifting mechanism is fixed to the bottom of the upper box, the lower fixing plate of the lifting mechanism is fixed to the top of the lower box, and the lower box moves up and down relative to the upper box under the drive of the lifting mechanism.

[0032] Further preferably, the upper and lower housings have interconnected fume ducts, and the lower housing has a cooking cavity isolated from the fume ducts. The lifting mechanism is located outside the fume ducts and the cooking cavity. This arrangement prevents fumes from contaminating the lifting mechanism, ensuring its reliable operation.

[0033] In order to enable the lifting mechanism to smoothly drive the lower box to move up and down, the entire lifting mechanism is located below the upper box and in the area centered on the left and right sides above the lower box.

[0034] To reduce friction during the lifting and lowering of the lower housing and make its movement smoother, the upper housing includes a fan frame. A vertical guide rail is installed on the outer wall of the fan frame. Driven by the lifting mechanism, the lower housing moves up and down relative to the upper housing along the vertical guide rail.

[0035] Compared with existing designs, the advantages of this utility model are as follows: the lifting mechanism constructs two sets of parallelogram structures through multiple connecting rods, multiple synchronous shafts, and upper and lower fixed plates, thereby achieving smooth lifting. After adopting this lifting mechanism, the range hood can ensure that the lifting body will not tilt in the left-right and front-back directions during the lifting process. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the lifting mechanism according to an embodiment of the present utility model;

[0037] Figure 2 for Figure 1 The diagram shows the lifting mechanism after the driving component has been removed.

[0038] Figure 3 This is a schematic diagram of the structure of the range hood according to an embodiment of the present utility model;

[0039] Figure 4 for Figure 3 The image shows a side view of the range hood. Detailed Implementation

[0040] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0041] like Figure 1 and Figure 2As shown, the lifting mechanism in this embodiment includes components such as a drive component 1, a first synchronous shaft 21, a second synchronous shaft 22, a third synchronous shaft 23, a fourth synchronous shaft 24, a fifth synchronous shaft 25, a sixth synchronous shaft 26, a first gear 31, a second gear 32, a first rack 41, a second rack 42, a linkage rod 43, a first connecting rod 51, a second connecting rod 52, a third connecting rod 53, a fourth connecting rod 54, a fifth connecting rod 55, a sixth connecting rod 56, a seventh connecting rod 57, a lower fixing plate 61, and an upper fixing plate 62.

[0042] The driving component 1 is an electric push rod, which is located between the upper fixed plate 62 and the lower fixed plate 61. Both the lower fixed plate 61 and the upper fixed plate 62 are horizontally arranged. Figure 1The direction indicated by arrow A is to the right. The first synchronous shaft 21 is located above the lower fixed plate 61. The first synchronous shaft 21 is distributed front-to-back and installed on the left side of the lower fixed plate 61. The output end of the electric push rod is installed on the first synchronous shaft 21. The first gear 31 is installed at the front end of the first synchronous shaft 21. The first rack 41 is horizontally arranged below the first gear 31 and meshes with the first gear 31. Driven by the electric push rod, the first gear 31 rotates, thereby driving the first rack 41 to move left and right. There are two first connecting rods 51, which are respectively located at the front and rear ends of the first synchronous shaft 21. Both first connecting rods 51 are inclined to the left from bottom to top and are parallel to each other. The lower end of the first connecting rod 51 is rotatably connected to the corresponding end of the first synchronous shaft 21. The second synchronous shaft 22 is arranged parallel to the top of the first synchronous shaft 21. The upper end of the first connecting rod 51 is rotatably connected to the corresponding end of the second synchronous shaft 22. The third synchronous shaft 23 is arranged parallel to the second synchronous shaft 22 and at the same horizontal height. The third synchronous shaft 23 is located to the right of the second synchronous shaft 22. Two second connecting rods 52 are arranged horizontally to the left and right, and are parallel to each other. The left end of the second connecting rod 52 is rotatably connected to the corresponding end of the second synchronous shaft 22, and the right end of the second connecting rod 52 is rotatably connected to the corresponding end of the third synchronous shaft 23. Two third connecting rods 53 are arranged to the right of the first connecting rod 51, and are parallel to the first connecting rod 51 on the same side. That is, the third connecting rod 53 is also arranged obliquely to the left from bottom to top, and the upper end of the third connecting rod 53 is rotatably connected to the corresponding end of the third synchronous shaft 23. The fourth synchronous shaft 24 is arranged parallel to the first synchronous shaft 21 and at the same horizontal height. The fourth synchronous shaft 24 is located to the right of the first synchronous shaft 21 and is mounted on the lower fixed plate 61. The lower end of the third connecting rod 53 is mounted on the corresponding end of the fourth synchronous shaft 24, and the lower end of the third connecting rod 53 is rotatably connected to the lower fixed plate 61. Two fourth connecting rods 54 are positioned above the corresponding first connecting rod 51. The two fourth connecting rods 54 are parallel to each other and both slope upwards to the right. The lower end of each fourth connecting rod 54 is rotatably connected to the corresponding end of the second synchronous shaft 22, and the upper end of each fourth connecting rod 54 is rotatably connected to the upper fixed plate 62. The angle between the fourth connecting rod 54 and the upper fixed plate 62 is equal to the angle between the first connecting rod 51 and the lower fixed plate 61. Two fifth connecting rods 55 are positioned to the right of the fourth connecting rod 54. The fifth connecting rod 55 is parallel to the fourth connecting rod 54 on the same side. The lower end of each fifth connecting rod 55 is rotatably connected to the corresponding end of the third synchronous shaft 23, and the upper end of each fifth connecting rod 55 is rotatably connected to the upper fixed plate 62. It can be seen that the first link, the second link 52, the third link 53 and the lower fixed plate 61 form the first set of parallelogram structures. Since there are two of each of the first link 51, the second link 52 and the third link 53, this set of parallelogram structures includes two parallelograms arranged in front and behind.The fourth link 54, the second link 52, the fifth link 55, and the upper fixed plate 62 form a second set of parallelogram structures. Since there are two of each of the fourth link 54, the second link 52, and the fifth link 55, this set of parallelogram structures also includes two parallelograms arranged front and back. The first and second sets of parallelogram structures are interconnected to ensure that the upper fixed plate 62 and the lower fixed plate 61 maintain a horizontal position during mutual lifting and lowering. Furthermore, the use of front-to-back parallelograms ensures that the load does not tilt in the front-to-back direction.

[0043] The fifth synchronous shaft 25, the second gear 32, the second rack 42, the linkage rod 43, the sixth synchronous shaft 26, the sixth connecting rod 56, and the seventh connecting rod 57 constitute the auxiliary linkage mechanism. The fifth synchronous shaft 25 is parallel to the right side of the fourth synchronous shaft 24, and the fifth synchronous shaft 25 and the fourth synchronous shaft 24 are at the same horizontal height. The fifth synchronous shaft 25 is mounted on the lower fixed plate 61. The second gear 32 is located to the right of the first gear 31 and is mounted at the front end of the fifth synchronous shaft 25. The second rack 42 is located above the second gear 32, and the second rack 42 is horizontally positioned and meshes with the second gear 32. The linkage rod 43 is fixedly connected between the first rack 41 and the second rack 42. The sixth synchronous shaft 26 is parallel to the fifth synchronous shaft 25 and is positioned above it. There are two sixth connecting rods 56, parallel to each other, inclined to the right from bottom to top. The lower ends of the two sixth connecting rods 56 are rotatably connected to the corresponding ends of the fifth synchronous shaft 25, and the upper ends are rotatably connected to the corresponding ends of the sixth synchronous shaft 26. Two seventh links 57 are positioned above the corresponding sixth link 56. The seventh links 57 are parallel to each other and inclined to the left from bottom to top. The lower end of the seventh link 57 is rotatably connected to the corresponding end of the sixth synchronous shaft 26, and the upper end is rotatably connected to the upper fixed plate 62. In this embodiment, the lengths of the first link 51, the third link 53, the fourth link 54, the fifth link 55, the sixth link 56, and the seventh link 57 are equal.

[0044] In this embodiment, the electric push rod is located between the connecting rods on the front and rear sides. The first gear 31 meshes with the first rack 41, and the second gear 32 meshes with the second rack 42. The first rack 41 and the second rack 42 are fixedly connected by the linkage rod 43. During operation, under the transmission of the first gear 31, the first rack 41, the linkage rod 43, the second rack 42, and the second gear 32, the power of the electric push rod is synchronously transmitted to the sixth connecting rod 56 through the linkage rod 43. This allows the main linkage mechanism on the left and the auxiliary linkage mechanism on the right to operate synchronously, further ensuring that the upper fixed plate 62 and the lower fixed plate 61 remain in a horizontal position during the lifting and lowering motion, making the movement more stable.

[0045] like Figure 3 and Figure 4As shown, the range hood in this embodiment is a lift-type range hood, including an upper housing and a lower housing. The lifting mechanism is installed between the upper and lower housings, located below the upper housing and in the centrally located area above the lower housing. The upper fixing plate 62 of the lifting mechanism is fixed to the bottom of the upper housing, and the lower fixing plate 61 is fixed to the top of the lower housing. Driven by the lifting mechanism, the lower housing moves up and down relative to the upper housing. The lifting mechanism ensures that the lower housing remains horizontal during the lifting process, without tilting in the left-right or front-back directions, achieving smooth lifting.

[0046] The upper and lower housings have interconnected fume extraction ducts. The lifting mechanism is located outside the fume extraction ducts, preventing grease from contaminating the lifting mechanism during operation and effectively ensuring its reliability. The lower housing contains a cooking cavity 7, isolated from the fume extraction ducts. This cooking cavity can perform functions such as steaming, baking, microwaving, and refrigeration. The lifting mechanism is located outside the cooking cavity 7, specifically at the top of it.

[0047] The upper housing includes a fan frame 8, and a vertical guide rail 9 is installed on the outer wall of the fan frame 8. Driven by the lifting mechanism, the lower housing moves up and down relative to the upper housing along the vertical guide rail 9, making the movement more stable.

Claims

1. A lifting mechanism, characterized in that... Including: Drive component (1); The first synchronous shaft (21) is installed at the output end of the drive unit (1); The first gear (31) is installed at one end of the first synchronous shaft (21); The first rack (41) is horizontally positioned and meshes with the first gear (31); There are two first connecting rods (51) respectively located at both ends of the first synchronous shaft (21). The lower end of the first connecting rod (51) is rotatably connected to the corresponding end of the first synchronous shaft (21). The second synchronous shaft (22) is arranged parallel above the first synchronous shaft (21), and the upper end of the first connecting rod (51) is rotatably connected to the corresponding end of the second synchronous shaft (22). The third synchronous axis (23) is set parallel to the second synchronous axis (22) and at the same horizontal height, with the third synchronous axis (23) located to the right of the second synchronous axis (22); The second link (52) has two parts and is set horizontally to the left and right. The left end of the second link (52) is rotatably connected to the corresponding end of the second synchronous shaft (22), and the right end is rotatably connected to the corresponding end of the third synchronous shaft (23). The third link (53) has two parallel links on the right side of the first link (51). The third link (53) is parallel to the first link (51) on the same side. The upper end of the third link (53) is rotatably connected to the corresponding end of the third synchronous shaft (23). The lower fixing plate (61) is horizontally set and located below the first synchronous shaft (21), and the lower end of the third connecting rod (53) is rotatably connected to the lower fixing plate (61); The fourth link (54) has two parallel links located above the corresponding first link (51), and the lower end of the fourth link (54) is rotatably connected to the corresponding end of the second synchronous shaft (22). The fifth link (55) has two branches located on the right side of the fourth link (54). The fifth link (55) is parallel to the fourth link (54) on the same side. The lower end of the fifth link (55) is rotatably connected to the corresponding end of the third synchronous shaft (23). The upper fixing plate (62) is horizontally positioned above the lower fixing plate (61), and the upper ends of the fourth link (54) and the fifth link (55) are rotatably connected to the upper fixing plate (62).

2. The lifting mechanism according to claim 1, characterized in that: It also includes a fourth synchronous shaft (24), which is parallel to the first synchronous shaft (21) and located at the same horizontal height. The fourth synchronous shaft (24) is located to the right of the first synchronous shaft (21), and the lower end of the third connecting rod (53) is installed at the corresponding end of the fourth synchronous shaft (24).

3. The lifting mechanism according to claim 2, characterized in that... It also includes: The fifth synchronous axis (25) is arranged parallel to the right side of the fourth synchronous axis (24); The second gear (32) is located on the right side of the first gear (31) and installed at one end of the fifth synchronous shaft (25); The second rack (42) is horizontally positioned and meshes with the second gear (32); The linkage rod (43) is fixedly connected between the first rack (41) and the second rack (42); The sixth synchronous axis (26) is arranged parallel above the fifth synchronous axis (25); The sixth link (56) has two parts, with the lower end rotatably connected to the corresponding end of the fifth synchronous shaft (25) and the upper end rotatably connected to the corresponding end of the sixth synchronous shaft (26); The seventh link (57) has two branches arranged above the corresponding sixth link (56), with the lower end rotatably connected to the corresponding end of the sixth synchronous shaft (26) and the upper end rotatably connected to the upper fixed plate (62).

4. The lifting mechanism according to claim 3, characterized in that: The fifth synchronous shaft (25) and the fourth synchronous shaft (24) are located at the same horizontal level.

5. The lifting mechanism according to claim 3, characterized in that: The first rack (41) is located below the first gear (31), and the second rack (42) is located above the second gear (32).

6. The lifting mechanism according to claim 1, characterized in that: The driving component (1) is an electric push rod, which is located between the upper fixed plate (62) and the lower fixed plate (61), and is located inside the first link (51), the second link (52), the third link (53), the fourth link (54) and the fifth link (55).

7. A range hood, comprising an upper housing and a lower housing, characterized in that: A lifting mechanism as described in any one of claims 1 to 6 is installed between the upper box and the lower box. The upper fixing plate (62) of the lifting mechanism is fixed to the bottom of the upper box, and the lower fixing plate (61) of the lifting mechanism is fixed to the top of the lower box. The lower box moves up and down relative to the upper box under the drive of the lifting mechanism.

8. The range hood according to claim 7, characterized in that: The upper and lower housings have interconnected fume ducts. The lower housing has a cooking cavity (7) that is isolated from the fume ducts. The lifting mechanism is located outside the fume ducts and the cooking cavity (7).

9. The range hood according to claim 8, characterized in that: The lifting mechanism is located below the upper housing and in the area centered on the left and right sides above the lower housing.

10. The range hood according to claim 7, characterized in that: The upper housing includes a fan frame (8), and a vertical guide rail (9) is installed on the outer wall of the fan frame (8). Under the drive of the lifting mechanism, the lower housing moves up and down relative to the upper housing along the vertical guide rail (9).

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