Range hood

Abstract

The utility model discloses a range hood which comprises an exhaust fume collecting hood and an air inlet formed in the exhaust fume collecting hood, and further comprises a smoke barrier capable of turning over to open or close the air inlet and a movement mechanism for driving the smoke barrier to turn over, and the movement mechanism comprises a driving end and a driven end which are arranged corresponding to the left side and the right side of the smoke barrier. Each of the driving end and the driven end comprises a rotating shaft seat, a rotating shaft and a crank, the rotating shaft seat is arranged on the inner side of the exhaust fume collecting hood, the rotating shaft is arranged on the rotating shaft seat, the extending direction of the rotating shaft is the left-right direction, one end of the crank is connected with the rotating shaft, and the other end of the crank is connected with the exhaust fume barrier; and the crank at the driving end is driven by a driving device. The range hood is characterized by further comprising an elastic mechanism which enables the crank at the driven end to keep the trend of rotating towards the direction of driving the smoke barrier to close the air inlet.

Description

Technical Field

[0001] The utility model relates to an oil fume purification device, in particular to an oil fume extractor. Background Art

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It can quickly remove waste from stove combustion and fumes generated during cooking and discharge them outdoors, reduce pollution, and purify the air. In order to better absorb fumes and prevent them from escaping, a deflectable smoke shield is usually provided at the air inlet position of the air inlet panel of the existing range hood. When the smoke shield is closed, it can cover the air inlet of the air inlet panel. When the smoke shield is opened at a certain angle, a triangular smoke collection area is formed between the bottom of the smoke shield and the air inlet panel. When the range hood is working, the smoke shield flips outward at an angle, which can slow down the fumes that rise to the smoke shield and keep them in the area below the smoke shield, and then be sucked out of the range hood in time, reducing the escape of fumes. Adding a smoke shield can greatly improve the exhaust performance of the range hood.

[0003] For example, the Chinese utility model patent application number 201821360374.4 discloses an opening and closing mechanism for a smoke damper of a range hood, in which a driving source is connected to a smoke damper bracket through a transmission assembly, the smoke damper bracket is fixed to the back of the smoke damper, the transmission assembly includes a crank, a connecting rod and a rocker, a first end of the crank is fixed to an output shaft of the driving source, a second end of the crank is rotatably connected to a first end of the connecting rod, a second end of the connecting rod is rotatably connected to a first end of the rocker, a second end of the rocker is fixed to the smoke damper bracket, a limit shaft is installed on the fixed bracket, and when the smoke damper is fully opened, the limit shaft abuts against the crank to prevent the smoke damper from further opening.

[0004] The existing smoke shield driving motor is placed at one of the left and right ends of the smoke shield, and only one end is equipped with a driving motor. Taking the driving motor placed at the left end as an example, after the smoke shield on the left end is closed, it can be partially fitted with the smoke hood at the air inlet, that is, the smoke shield can be completely closed. However, due to the weight of the glass at the right end of the smoke shield, the glass will be distorted, resulting in the inability to completely close the right end of the smoke shield.

[0005] In order to solve the problem that one end of the smoke baffle cannot be completely closed, some range hoods are equipped with two smoke baffle drive motors so that both the left and right sides of the smoke baffle can be subjected to sufficiently large forces to fit the smoke hood, but the cost of two motors is too high.

[0006] When using a single drive motor, when the smoke damper is opening or closing, there will be a reversing gap in the gear box of the drive motor. When the smoke damper moves to the lowest point, the gear reversing gap will move from the moving side to the other side, causing the smoke damper to shake during movement. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a range hood in view of the deficiencies in the above-mentioned prior art, which can achieve complete closure of the left and right sides of the smoke shield without increasing the number of drive motors, and solve the problem of shaking of the smoke shield during movement caused by reversing of a single drive motor.

[0008] The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a range hood comprising a smoke hood and an air inlet opened on the smoke hood, the range hood also comprising a smoke baffle capable of flipping over to open or close the air inlet and a motion mechanism that drives the smoke baffle to flip over, the motion mechanism comprising an active end and a driven end arranged on the left and right sides of the smoke baffle, the active end and the driven end both comprising a rotating shaft seat, a rotating shaft and a crank, the rotating shaft seat being arranged on the inner side of the smoke hood, the rotating shaft being arranged on the rotating shaft seat, the extending direction of the rotating shaft being left and right, one end of the crank being connected to the rotating shaft, and the other end of the crank being connected to the smoke baffle, the range hood also comprising a driving device, the crank at the active end being driven by the driving device, and the characteristic is that the range hood also comprises an elastic mechanism that enables the crank at the driven end to maintain a rotational tendency in the direction of driving the smoke baffle to close the air inlet.

[0009] By arranging an elastic mechanism at the driven end to keep the crank of the driven end rotating in the direction of driving the smoke baffle to close the air inlet, the smoke baffle part on the corresponding side of the driven end can be completely closed.

[0010] In order to completely close the smoke baffle portion corresponding to the driven end, the elastic mechanism is provided to include a torsion spring, one end of which is directly or indirectly connected to the inner side of the smoke hood, and the other end of the torsion spring is connected to the crank.

[0011] In order to realize the connection between the elastic mechanism and the crank, the elastic mechanism also includes a pin and a gear hole. The gear hole is opened on the crank. The pin is arranged on one end of the torsion spring close to the crank, and the pin is engaged with the gear hole.

[0012] In order to solve the problem of the smoke deflector being twisted due to the reverse torque provided by the torsion spring when the smoke deflector is opened, there are at least two gear holes, and the gear holes are arranged in an arc shape.

[0013] In order to fix the torsion spring, one end of the torsion spring away from the crank is connected to the rotating shaft seat.

[0014] In order to solve the problem of the smoke shield being twisted due to the reverse torque provided by the torsion spring when the smoke shield is opened, the elastic mechanism includes a ratchet that can increase the torsion force of the torsion spring by rotating. The ratchet is arranged on the shaft seat, and the torsion spring is arranged on the ratchet at one end away from the crank.

[0015] In order to realize the connection between the torsion spring and the ratchet, the ratchet includes a fixed wheel and a moving wheel that can rotate relative to the fixed wheel, the fixed wheel is arranged on the rotating shaft seat, and the end of the torsion spring away from the crank is arranged on the moving wheel. Compared with the prior art, the advantage of the utility model lies in that an elastic mechanism is arranged at the driven end to keep the crank of the driven end rotating in the direction of driving the smoke baffle to close the air inlet, so that the smoke baffle part on the corresponding side of the driven end can be completely closed. By setting a plurality of gear holes to adjust the initial torsion spring, the problem of the smoke baffle being twisted due to the reverse torque provided by the torsion spring when the smoke baffle is opened can be solved. By setting a ratchet to adjust the initial torsion spring, the problem of the smoke baffle being twisted due to the reverse torque provided by the torsion spring when the smoke baffle is opened can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of a range hood according to Embodiment 1 of the present utility model;

[0017] Figure 2 This is a front cross-sectional view of a range hood according to Embodiment 1 of the present utility model;

[0018] Figure 3 It is a schematic diagram of the active end of the motion mechanism of the range hood according to the first embodiment of the utility model;

[0019] Figure 4 It is a side cross-sectional view of the range hood according to the first embodiment of the utility model;

[0020] Figure 5 for Figure 4 Enlarged view of part I;

[0021] Figure 6 It is a schematic diagram of the driven end of the motion mechanism of the range hood according to the second embodiment of the utility model. DETAILED DESCRIPTION

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0023] See also Figure 1 A range hood comprises a smoke collecting hood 1 and an air inlet 2 provided on the smoke collecting hood 1 . The range hood further comprises a smoke baffle 3 which can be flipped to open or close the air inlet 2 .

[0024] See also Figure 2 to Figure 5The range hood also includes a motion mechanism capable of driving the smoke baffle 3 to flip, and the motion mechanism includes an active end 41 and a driven end 42. The active end 41 is correspondingly arranged on the left side of the smoke baffle 3, and the active end 41 is used to control the opening and closing of the left side of the smoke baffle 3. The driven end 42 is arranged on the right side of the smoke baffle 3, and the driven end 42 is used to control the opening and closing of the right side of the smoke baffle 3. The active end and the driven end 42 both include a rotating shaft seat 43, a rotating shaft 44 and a crank 45. The rotating shaft seat 43 is arranged on the inner side of the smoke hood 1, and the rotating shaft seat 43 is stationary relative to the whole machine and cannot be moved or rotated. The rotating shaft 44 is arranged on the rotating shaft seat 43, and the extension direction of the rotating shaft 44 is the left and right direction. One end of the crank 45 is connected to the rotating shaft 44, and the other end of the crank 45 is connected to the smoke baffle 3. The motion mechanism also includes a driving device 46, and the crank 45 of the active end 41 is driven to rotate. Preferably, the driving device 46 is a motor.

[0025] The range hood also includes an elastic mechanism that keeps the crank 45 at the driven end rotating in the direction of driving the smoke baffle 3 to close the air inlet 2. The elastic mechanism includes a torsion spring 51, one end of which is connected to the rotating shaft seat 43, and the other end of the torsion spring 51 is connected to the crank 45. A pin 52 is provided at one end of the torsion spring 51 away from the crank 45, and a gear hole 53 is provided on the crank 45, and the pin 52 is engaged with the gear hole 53. The torsion spring 51 can provide a torsion force to the smoke baffle 3. The torsion spring 51 will provide a torsion force for closing the smoke baffle 3 to offset the gravity of the smoke baffle 3 in the closed state, so that the right side of the smoke baffle 3 corresponding to the driven end 42 can also be completely closed without the problem of sinking.

[0026] After the torsion spring 51 is assembled, the torsion spring 51 will continuously output a torque in the closing direction of the smoke baffle 3 to the smoke baffle 3, and this torque is greater than the torque of the smoke baffle 3's own gravity relative to the rotation center when the smoke baffle 3 is in the closed state. Therefore, during the movement of the smoke baffle 3, whether it is opened or closed, the reverse clearance of the gear of the driving device 46 is always toward one side, so that the smoke baffle 3 is smoother during the movement without shaking.

[0027] When the smoke damper is closed, the torsion spring 51 can completely close the right side part of the smoke damper 3 corresponding to the driven end 42; however, when the smoke damper 3 is opened, the force of the torsion spring 51 is always opposite to the force of opening the smoke damper 3, so that when the smoke damper 3 is opened to the maximum, the tension of the torsion spring 51 is the largest, which will cause the smoke damper 3 to be twisted by the tension of the torsion spring 51 in the open state. In order to solve the above problem, the gear holes 53 have at least two gear holes 53, and the gear holes 53 are arranged in an arc shape, that is, the overall arrangement is in an arc shape.

[0028] When assembling the range hood, the pin 52 on the torsion spring 51 can be assembled into different gear holes 53. Different gear holes 53 cause different deformations of the torsion spring 51, so that the initial torque of the torsion spring can be adjusted by adjusting the position of the pin 52.

[0029] The method of adjusting the torsion spring 51 during assembly is: first insert the pin 52 into the gear hole 53 that can maximize the torque to ensure that the smoke shield 3 can be completely closed, then gradually downshift and insert the pin into the gear hole 53 that makes the torsion spring 51 one gear lower in torque until the smoke shield 3 is not completely closed. If the gear hole 53 is in the D gear at this time, the pin needs to be inserted into the D+1 gear hole 53 in the final assembly state. This is to determine the gear hole 53 where the torsion spring 51 can provide the minimum torque of the smoke shield 3. The torque that the torsion spring 51 can provide at this time is just enough to completely close the smoke shield 3, thereby reducing the distortion of the smoke shield 3 caused by the reverse torque provided by the torsion spring 51.

[0030] Embodiment 2

[0031] See also Figure 6 In this embodiment, the elastic mechanism includes a ratchet 54 that can increase the torque of the torsion spring 51 by rotating. The ratchet 54 includes a fixed wheel 541 and a moving wheel 542 that can rotate relative to the fixed wheel 541. The fixed wheel 541 is set on the rotating shaft seat 43, and a pin 52 is set on one end of the torsion spring 51, which is fixedly connected to the crank 45 through the pin 52. The end of the torsion spring 51 away from the crank 45 is set on the moving wheel 542.

[0032] When the torsion spring 51 is not yet stressed, there is a gap between the smoke damper 3 and the smoke hood 1 at the air inlet 2, and the smoke damper 3 is not completely closed. In this state, the ratchet 54 is twisted to drive the torsion spring 51 to rotate. The ratchet 54 can only rotate in the direction of increasing torque of the torsion spring 51. The torsion of the torsion spring 51 gradually increases, acting on the smoke damper 3, causing the smoke damper 3 to rotate in the direction of tight closing. The ratchet 54 is twisted until the smoke damper 3 is just completely against the smoke hood 1 and then stops rotating.

Claims

1. A range hood, comprising a smoke collecting hood (1) and an air inlet (2) provided on the smoke collecting hood (1), the range hood further comprising a smoke baffle (3) capable of flipping to open or close the air inlet (2) and a motion mechanism for driving the smoke baffle (3) to flip, the motion mechanism comprising an active end (41) and a driven end (42) arranged on the left and right sides of the smoke baffle (3), the active end (41) and the driven end (42) both comprising a rotating shaft seat (43), a rotating shaft (44) and The range hood comprises a crank (45), the shaft seat (43) being arranged on the inner side of the smoke collecting hood (1), the shaft (44) being arranged on the shaft seat (43), the shaft (44) extending in the left-right direction, one end of the crank (45) being connected to the shaft (44), the other end of the crank (45) being connected to the smoke baffle (3), the range hood further comprising a driving device (46), the crank (45) at the active end (41) being driven by the driving device (46), and characterized in that: The range hood also includes an elastic mechanism that enables the crank (45) at the driven end to maintain a rotational tendency in a direction that drives the smoke baffle (3) to close the air inlet (2).

2. The range hood according to claim 1, characterized in that: The elastic mechanism comprises a torsion spring (51), one end of which is directly or indirectly connected to the inner side of the smoke collecting hood (1), and the other end of which is connected to the crank (45).

3. The range hood according to claim 2, characterized in that: The elastic mechanism further comprises a pin (52) and a gear hole (53); the gear hole (53) is provided on the crank (45); the pin (52) is arranged on one end of the torsion spring (51) close to the crank (45); and the pin (52) is engaged with the gear hole (53).

4. The range hood according to claim 3, characterized in that: There are at least two gear holes (53), and the gear holes (53) are arranged in an arc shape.

5. The range hood according to claim 2, characterized in that: One end of the torsion spring (51) away from the crank (45) is connected to the rotating shaft seat (43).

6. The range hood according to claim 3, characterized in that: The elastic mechanism comprises a ratchet (54) capable of increasing the torsion force of the torsion spring (51) by rotating, the ratchet (54) being arranged on the rotating shaft seat (43), and the end of the torsion spring (51) away from the crank (45) being arranged on the ratchet (54).

7. The range hood according to claim 6, characterized in that: The ratchet wheel (54) comprises a fixed wheel (541) and a moving wheel (542) capable of rotating relative to the fixed wheel (541); the fixed wheel (541) is arranged on a rotating shaft seat (43); and the end of the torsion spring (51) away from the crank (45) is arranged on the moving wheel (542).

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