Lifting mechanism and range hood provided with same

Abstract

A lifting mechanism and a range hood provided with the lifting mechanism are characterized in that a lead screw of the lifting mechanism is horizontally arranged and installed on an output shaft of a driving motor, the lead screw is provided with a first threaded section and a second threaded section which are opposite in thread direction, and a first sliding block at the upper end of a first swing arm of a shear type movement mechanism is in threaded connection with the first threaded section; a second sliding block at the upper end of the second swing arm is in threaded connection with the second threaded section, the first sliding block and the second sliding block are movably arranged on the upper supporting frame, and the lower end of the first swing arm and the lower end of the second swing arm are movably arranged on the lower supporting frame. When the lifting mechanism moves, the stress directions of the two sections of threads are opposite and counteract each other, it is guaranteed that the axial force of the lead screw is zero, the movement stability of the mechanism can be improved, the two swing arms are connected to the first thread section and the second thread section respectively, movement is in bilateral symmetry, and it can be guaranteed that the stress center point position does not change in the horizontal direction. The extractor hood adopting the lifting mechanism can ensure that the whole extractor hood does not incline or shake in the lifting process.

Description

TECHNICAL FIELD

[0001] The utility model relates to range hood especially, be related to a lifting mechanism and install the range hood of this lifting mechanism. BACKGROUND

[0002] Chinese cooking will produce a lot of oil fume, for keeping the kitchen environment clean and the health of human, the range hood has become one of the indispensable equipment in modern kitchen. The height of the negative pressure area of the range hood directly affects the oil fume suction effect, if the distance between the air inlet of the range hood and the oil fume generating area is large, the oil fume suction path is long, the suction time increases, which makes it easy to produce oil fume escape phenomenon in the cooking process, if the installation height of the range hood is reduced, although it is beneficial to improve the oil fume suction effect, but it will cause the cooking space to be too small, the head of the cook is easy to accidentally touch the smoke collecting cover, and after the installation height is reduced, the line of sight and the overall appearance of the kitchen are also affected. For this reason, people invented the lifting type range hood, such as the Chinese invention patent application No. 201310136828.5 (authorized announcement No. CN 104101010A) discloses a range hood with a manually liftable smoke collecting cavity, which is provided with a liftable smoke collecting cavity at the rear part of the inner cavity of the casing, the top of the liftable smoke collecting cavity is connected with the lower end of the lifter, and the upper end of the lifter is fixed on the reinforcing rib of the casing. The height of the smoke collecting cavity of the range hood can be adjusted arbitrarily during cooking by the control panel, so as to achieve the best smoke suction effect. Such as the Chinese utility model patent No. 201320075819.5 (authorized announcement No. CN203215771U) discloses a lifting range hood, which is provided with a flat and thin smoke suction cover at the bottom of the range hood body, the smoke suction cover has a main smoke suction port on the front surface, and a lifting mechanism is arranged in the body to drive the smoke suction cover to move up and down. When in use, the smoke suction cover is lowered to play the role of oil fume suction, and when not in use, the smoke suction cover is raised to hide in the range hood body. The lifting range hood is provided with a lifting mechanism inside, the conventional lifting mechanism adopts the mode of lifting by motor driving vertical screw rod, some adopt the mode of vertical lifting by motor driving steel wire, and some adopt the mode of chain transmission. The existing lifting mechanism is usually arranged in the fan frame, which occupies the oil fume passage, on the one hand, it affects the performance of the fan and the oil fume suction effect, and on the other hand, the force position of the mechanism is far away from the gravity center position of the range hood, which is easy to cause the inclination of the whole machine during lifting. CONTENT OF THE UTILITY MODEL

[0003] The first technical problem to be solved by the utility model is to provide a lifting mechanism with good lifting movement stability in view of the above existing technology status.

[0004] The second technical problem to be solved by the utility model is to provide a range hood with stable lifting movement and less possibility of tilting.

[0005] The utility model solves the above-mentioned first technical problem by adopting the technical scheme of a lifting mechanism, characterized by comprising:

[0006] A driving motor;

[0007] A screw rod is horizontally arranged and installed on the output shaft of the driving motor, and has a first screw segment and a second screw segment with opposite screw directions;

[0008] A scissor-type movement mechanism comprises a first swing arm and a second swing arm connected to each other in rotation, a first sliding block is installed on the upper end of the first swing arm, a second sliding block is installed on the upper end of the second swing arm, the first sliding block is threadedly connected to the first screw segment, and the second sliding block is threadedly connected to the second screw segment;

[0009] An upper support frame, in which the first sliding block and the second sliding block are movably arranged;

[0010] A lower support frame, in which the lower ends of the first swing arm and the second swing arm are movably arranged.

[0011] In order to reduce the friction between the first sliding block, the second sliding block and the upper support frame, bearings are installed on both ends of the first sliding block and the second sliding block, and the first sliding block and the second sliding block are rollingly arranged on the upper support frame through the bearings;

[0012] In order to reduce the friction between the first swing arm, the second swing arm and the lower support frame, rolling shafts are installed on the lower ends of the first swing arm and the second swing arm, and the first swing arm and the second swing arm are rollingly arranged on the lower support frame through the rolling shafts.

[0013] Further preferably, the upper support frame is a fixed frame, the lower support frame is a lifting frame, the bearings are limited on the lower support frame and can move horizontally relative to the lower support frame, and the rolling shafts are limited on the lower support frame and can move horizontally relative to the lower support frame. In this way, under the driving of the driving motor, the lower support frame can move up and down relative to the upper support frame.

[0014] The upper support frame can have various structures, and preferably, the upper support frame comprises an upper guide plate and an upper cover plate arranged above the upper guide plate, the bearings are rollingly arranged between the upper guide plate and the upper cover plate, the lower support frame comprises a lower guide plate and a lower cover plate arranged below the lower guide plate, and the rolling shafts are fixedly arranged between the lower guide plate and the lower cover plate.

[0015] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: 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, and the lower box moves up and down relative to the upper box under the drive of the lifting mechanism.

[0016] To prevent oil fumes from contaminating the lifting mechanism, the upper and lower housings have interconnected oil fume ducts. The lower housing has an inlet chamber and a cooking chamber located in front of the inlet chamber. The inlet chamber is upstream of the oil fume duct and is isolated from the cooking chamber. The lifting mechanism is located outside the oil fume duct, at the top of the cooking chamber, and positioned entirely in front of the inlet chamber. With this structure, the installation position of the lifting mechanism will not affect the internal air duct for oil fume extraction and will not adversely affect the oil fume extraction effect.

[0017] In order for the lifting mechanism to drive the lower box to move up and down relative to the upper box, the upper support frame of the lifting mechanism is fixed to the bottom of the upper box, and the lower support frame of the lifting mechanism is fixed to the top of the lower box.

[0018] In order to enable the lifting mechanism to smoothly drive the lower box to move up and down, the lifting mechanism is located below the upper box and in the area centered on the left and right sides above the lower box.

[0019] To reduce friction during the lifting and lowering of the lower housing and make its movement smoother, a vertical guide rail is installed between the upper and lower housings. Driven by the lifting mechanism, the lower housing moves up and down relative to the upper housing along the vertical guide rail.

[0020] Compared with existing designs, the advantages of this invention are as follows: The lead screw of the lifting mechanism has a first threaded section and a second threaded section with opposite thread directions. During movement, the two threaded sections experience opposite forces that cancel each other out, ensuring that the axial force of the lead screw is zero. This state improves the stability of the mechanism's movement. The two swing arms of the scissor-type lifting mechanism are respectively connected to the first and second threaded sections, and their movement is symmetrical, ensuring that the position of the force center point remains unchanged in the horizontal direction. The range hood using this lifting mechanism ensures that the entire unit does not tilt or shake during the lifting process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the lifting mechanism according to an embodiment of the present utility model;

[0022] Figure 2 for Figure 1 The diagram shows the lifting mechanism after the top cover plate has been removed.

[0023] Figure 3 for Figure 1Structure sectional view of the shown lifting mechanism;

[0024] Figure 4 Structure schematic view of the range hood of the embodiment of the utility model (lowering state);

[0025] Figure 5 Structure schematic view of the range hood of the embodiment of the utility model (lifting state). DETAILED DESCRIPTION

[0026] The utility model will be further described in detail below in combination with the embodiment of the drawings.

[0027] As Figures 1 to 3 shown, the lifting mechanism of the embodiment includes driving motor 1, screw rod 2, scissor type movement mechanism 3, upper support frame 4, lower support frame 5, bearing 6 and rolling shaft 7 and other components. Among them, screw rod 2 is horizontally arranged and installed on the output shaft of driving motor 1, and screw rod 2 has first threaded section 21 and second threaded section 22 with opposite screw directions. Scissor type movement mechanism 3 includes first swing arm 31 and second swing arm 32 connected with each other in rotation, the upper end of first swing arm 31 is installed with first sliding block 33, the upper end of second swing arm 32 is installed with second sliding block 34, first sliding block 33 is threadedly connected on first threaded section 21, and second sliding block 34 is threadedly connected on second threaded section 22. Both ends of first sliding block 33 and second sliding block 34 are installed with bearing 6, and first sliding block 33 and second sliding block 34 are arranged in rolling through bearing 6 on upper support frame 4. The lower end of first swing arm 31 and second swing arm 32 is installed with rolling shaft 7, and first swing arm 31 and second swing arm 32 are arranged in rolling through rolling shaft 7 on lower support frame 5. The first swing arm 31 and the second swing arm 32 of the scissor type lifting mechanism are symmetrical left and right, and the motion trajectories are completely symmetrical, which can ensure that the position of the stress center point does not change in the horizontal direction. The screw rod 2 responsible for transmission is divided into two sections of threads, the stress directions of the two sections of threads are opposite and offset each other during movement, which ensures that the axial force of screw rod 2 is zero, thereby improving the stability of the mechanism movement.

[0028] The upper support frame 4 of the embodiment is a fixed frame, the lower support frame 5 is a lifting frame, the bearing 6 is limited on the lower support frame 5 and can move horizontally relative to the lower support frame 5, and the rolling shaft 7 is limited on the lower support frame 5 and can move horizontally relative to the lower support frame 5. The upper support frame 4 includes upper guide plate 41 and upper cover plate 42 arranged above the upper guide plate 41, and the bearing 6 is arranged in rolling between the upper guide plate 41 and the upper cover plate 42. The lower support frame 5 includes lower guide plate 51 and lower cover plate 52 arranged below the lower guide plate 51, and the rolling shaft 7 is fixedly arranged between the lower guide plate 51 and the lower cover plate 52.

[0029] As Figure 4 and Figure 5As shown, the range hood of the embodiment is a lifting range hood, which comprises an upper cabinet and a lower cabinet. A lifting mechanism is installed between the upper cabinet and the lower cabinet and is located in the middle area of the lower cabinet and below the upper cabinet. Under the drive of the lifting mechanism, the first swing arm 31 and the second swing arm 32 of the scissor mechanism 3 move synchronously in opposite directions, and the movement is completely symmetrical. Therefore, the position of the center stress point remains unchanged and coincides with the center of the load, so that the lower cabinet moves stably relative to the upper cabinet and avoids tilting and shaking during the lifting process.

[0030] The upper cabinet and the lower cabinet have a smoke channel that is in communication with each other. The lifting mechanism is located outside the smoke channel, so that the oil fume pollution of the lifting mechanism can be avoided when the range hood is working, and the reliability of the lifting mechanism is effectively ensured. The lower cabinet has a cooking cavity 8 that is isolated from the smoke channel. The cooking cavity can realize functions such as steaming and baking. The lifting mechanism is located outside the smoke channel and the cooking cavity 8, and is specifically located at the top of the cooking cavity 8.

[0031] The upper support frame 4 of the lifting mechanism is fixed to the bottom of the upper cabinet, and the lower support frame 5 of the lifting mechanism is fixed to the top of the lower cabinet. A vertical guide rail 9 is installed between the upper cabinet and the lower cabinet. The upper cabinet comprises a fan frame 10, and the vertical guide rail 9 is arranged on the left and right side walls and the rear side wall of the fan frame 10. Under the drive of the lifting mechanism, the lower cabinet moves up and down relative to the upper cabinet along the vertical guide rail 9, so that the lifting movement of the lower cabinet is more stable.

Claims

1. A lifting mechanism, characterized in that Comprising: A driving motor (1); A screw rod (2) horizontally arranged and mounted on the output shaft of the driving motor (1), the screw rod (2) having a first threaded section (21) and a second threaded section (22) with opposite screw directions; A scissor mechanism (3) comprising a first swing arm (31) and a second swing arm (32) connected to each other in rotation, the upper end of the first swing arm (31) being mounted with a first sliding block (33), the upper end of the second swing arm (32) being mounted with a second sliding block (34), the first sliding block (33) being threadedly connected on the first threaded section (21), and the second sliding block (34) being threadedly connected on the second threaded section (22); An upper support frame (4), the first sliding block (33) and the second sliding block (34) being movably arranged on the upper support frame (4); A lower support frame (5), the lower ends of the first swing arm (31) and the second swing arm (32) being movably arranged on the lower support frame (5).

2. The lifting mechanism of claim 1, wherein: Both ends of the first sliding block (33) and the second sliding block (34) are mounted with bearings (6), and the first sliding block (33) and the second sliding block (34) are rollingly arranged on the upper support frame (4) through the bearings (6).

3. The lifting mechanism of claim 2, wherein: The lower ends of the first swing arm (31) and the second swing arm (32) are mounted with rolling shafts (7), and the first swing arm (31) and the second swing arm (32) are rollingly arranged on the lower support frame (5) through the rolling shafts (7).

4. The lifting mechanism of claim 3, wherein: The upper support frame (4) is a fixed frame, the lower support frame (5) is a lifting frame, the bearings (6) are limited on the lower support frame (5) and can move horizontally relative to the lower support frame (5), and the rolling shafts (7) are limited on the lower support frame (5) and can move horizontally relative to the lower support frame (5).

5. The lifting mechanism of claim 3, wherein: The upper support frame (4) comprises an upper guide plate (41) and an upper cover plate (42) arranged above the upper guide plate (41), the bearings (6) are rollingly arranged between the upper guide plate (41) and the upper cover plate (42), the lower support frame (5) comprises a lower guide plate (51) and a lower cover plate (52) arranged below the lower guide plate (51), and the rolling shafts (7) are fixedly arranged between the lower guide plate (51) and the lower cover plate (52).

6. A range hood comprising an upper cabinet and a lower cabinet, characterized by: The lifting mechanism of any one of claims 1 to 5 is mounted between the upper cabinet and the lower cabinet, and the lower cabinet moves up and down relative to the upper cabinet under the driving of the lifting mechanism.

7. The hood according to claim 6, characterized in that: The upper cabinet and the lower cabinet have a cooking fume passage communicating with each other, the lower cabinet has a cooking cavity (8) isolated from the cooking fume passage, and the lifting mechanism is arranged outside the cooking fume passage and the cooking cavity (8).

8. The hood according to claim 6, characterized in that: The upper support frame (4) of the lifting mechanism is fixed to the bottom of the upper cabinet, and the lower support frame (5) of the lifting mechanism is fixed to the top of the lower cabinet.

9. The hood according to claim 8, characterized in that: The lifting mechanism is located below the upper cabinet and in the middle area of the left and right of the upper cabinet.

10. The hood according to claim 6, characterized in that: Vertical guide rails (9) are mounted between the upper cabinet and the lower cabinet, and the lower cabinet moves up and down relative to the upper cabinet along the vertical guide rails (9) under the driving of the lifting mechanism.

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