Range hood

Abstract

The utility model relates to a range hood, which comprises a casing, the smoke baffle is driven by the driving device to rotate back and forth relative to the shell; the driving device comprises a driving motor and a power transmission assembly, the power transmission assembly comprises a power output gear, a sliding shaft capable of rotating around the axis of the sliding shaft and a clutch gear installed on the sliding shaft, and the power output gear is in transmission connection with an output shaft of the driving motor and is driven by the driving motor to rotate. The clutch gear can move between a locking position and an unlocking position along with the sliding shaft, when the clutch gear is in a locking state, the clutch gear is meshed with the power output gear, and when the clutch gear is in an unlocking state, the clutch gear is separated from the power output gear; the driving device further comprises an operation knob which is connected with the sliding shaft and used for driving the sliding shaft to move in the axial direction of the sliding shaft. The device has the advantage that when power transmission of the driving device breaks down, the smoke barrier can be opened manually.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a range hood. Background Art

[0002] A range hood is a kitchen appliance for purifying the kitchen environment. Range hoods are mainly divided into top suction type and side suction type. Among them, when the side suction type range hood is turned on and off, its smoke baffle will open and close to achieve the effect of gathering smoke. The opening and closing of the smoke baffle are generally driven by the cooperation of a motor and a motion mechanism. For example, the Chinese invention patent application with the application number CN202010609847.5 (the application publication number: CN111811008A) discloses the motion mechanism of the smoke baffle of this range hood.

[0003] However, there are still certain deficiencies in the existing range hoods. When the motor or the motion mechanism fails, the smoke baffle cannot be opened and closed, thus affecting the cooking process. Especially when a failure occurs during the opening process of the smoke baffle, the smoke exhaust effect will become worse. When encountering such an emergency, if the user chooses to continue cooking, the oil fume cannot be exhausted, which will not only affect the cooking experience but also the physical and mental health of the user.

[0004] Therefore, the existing range hoods still need to be further improved. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a range hood that can effectively solve the problem that the smoke baffle cannot be effectively opened due to the failure of the power transmission of the driving device, aiming at the current situation of the existing technology.

[0006] The technical solution adopted by the utility model to solve the above technical problem is: a range hood, comprising:

[0007] A casing having an air inlet at its front part;

[0008] A smoke baffle that can rotate back and forth relative to the casing under the drive of a driving device, so as to open or close the air inlet;

[0009] The driving device includes a driving motor and a power transmission assembly. The power transmission assembly includes a power output gear, a sliding shaft capable of rotating about its own axis, and a clutch gear mounted on the sliding shaft. The power output gear is in transmission connection with the output shaft of the driving motor and rotates under the drive of the driving motor. The smoke baffle is in transmission connection with the sliding shaft and can thus deflect under the drive of the rotation of the sliding shaft. The clutch gear can move with the sliding shaft between a locked position and an unlocked position. When the clutch gear is in the locked state, the clutch gear meshes with the power output gear. When the clutch gear is in the unlocked state, the clutch gear disengages from the power output gear. The driving device further includes an operation knob connected to the sliding shaft and used to drive the sliding shaft to move axially along it.

[0010] To facilitate the user to manually operate the operation knob, the sliding shaft is arranged inside the machine shell and extends in the left-right direction. The operation knob is arranged outside the left side wall or the right side wall of the machine shell and is connected to the end of the sliding shaft.

[0011] As an improvement, in order to avoid the direct contact between the operation knob and the side wall of the machine shell and for the convenience of arranging elastic members, etc., an installation hole is provided on the left side wall or the right side wall of the machine shell. A fixed disk is provided at the installation hole. The fixed disk is axially hollow and opposite to the installation hole. The sliding shaft passes through the installation hole and the fixed disk and is connected to the operation knob. The operation knob is in sliding contact with the fixed disk.

[0012] As an improvement, the outer peripheral edge of the fixed disk has an annular flange that extends by turning towards the side where the operation knob is located, and the operation knob abuts against the end of the annular flange.

[0013] In order to enable the sliding shaft and the clutch gear to automatically reset to the initial position when the operation knob is in a non-force-applied state and ensure that the clutch operation of the driving device is more labor-saving, an elastic member is further provided between the fixed disk and the operation knob. The operation knob always has a tendency to move towards the fixed disk under the action of the elastic member.

[0014] To install a tension spring, a first chute is provided on the side wall of the fixed disk facing the operation knob and is circumferentially provided, and a first slider is slidably limited in the first chute. A second chute is provided on the side wall of the operation knob facing the fixed disk and is circumferentially provided, and a second slider is slidably limited in the second chute. The elastic member is a tension spring. One end of the tension spring is connected to the first slider, and the other end is connected to the second slider. The setting of the above sliders and chutes also enables the tension spring not to be severely distorted when the operation knob rotates, ensuring that the rotation operation of the knob is more labor-saving.

[0015] In order to avoid the problem of slipping during the rotation of the operating knob, the outer peripheral wall of the operating knob is columnar and is provided with anti-slip grooves.

[0016] In order to ensure that the sliding shaft drives the smoke shield to rotate while allowing the sliding shaft to move along its axial direction, the smoke shield is rotatably connected to the casing through a rocker arm around a first axis extending left and right. The driving device also includes a driving rod and a connecting rod. The sliding shaft is connected to the first end of the driving rod and can be driven by the sliding shaft to deflect. The sliding shaft can also slide relative to the driving rod in the axial direction of the sliding shaft. The second end of the driving rod is rotatably connected to the first end of the connecting rod, and the second end of the connecting rod is rotatably connected to the rocker arm.

[0017] As a further improvement, the first end of the driving rod is constructed with a first through hole for the sliding shaft to pass through, the sliding shaft is provided with a sliding hole extending along its length direction, and the first end of the driving rod is also provided with a limit pin, which is inserted into the sliding hole.

[0018] As an improvement, the power transmission assembly includes a worm gear transmission assembly and a gear transmission assembly, the worm gear transmission assembly includes a worm connected to the output shaft of the drive motor and a worm wheel meshing with the worm, and the worm wheel is connected to the transmission of the gear transmission assembly. Generally speaking, the rotation of the worm can drive the worm wheel to rotate, but not vice versa. Therefore, the above structural design disengages the clutch gear from the meshing with the power output gear of the previous stage through internal and external translation, thereby achieving free rotation in both directions. In particular, the self-locking characteristics of the worm gear are utilized, so that the smoke baffle will not have a tendency or movement to close after opening, thereby ensuring the normal operation of the range hood.

[0019] In order to protect the power transmission assembly, a protective cover is also included which is arranged outside the worm gear transmission assembly and the gear transmission assembly.

[0020] Compared with the prior art, the advantages of the utility model are as follows: the sliding shaft is driven to move axially by operating the operating knob, so that the clutch gear on the sliding shaft is engaged or disengaged with the power output gear. In this way, the smoke shield can be opened and closed manually without making major changes to other parts. It is suitable for emergency situations where the smoke shield cannot be opened due to failure of the motor or power transmission of the drive device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of a range hood according to an embodiment of the utility model;

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of the driving device of the range hood according to the embodiment of the utility model;

[0023] Figure 3 Cross-sectional view of the range hood according to an embodiment of the present utility model (the clutch gear is in the unlocked state);

[0024] Figure 4 Cross-sectional view of the range hood according to an embodiment of the present utility model (the clutch gear is in the locked state);

[0025] Figure 5 Front view of the fixed disk according to an embodiment of the present utility model;

[0026] Figure 6 Front view of the operation knob according to an embodiment of the present utility model;

[0027] Figure 7 Schematic perspective view of the drive device according to an embodiment of the present utility model. Specific embodiments

[0028] The present utility model will be further described in detail below with reference to the embodiments in conjunction with the accompanying drawings.

[0029] In the description and claims of the present utility model, terms indicating directions such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc. are used to describe various exemplary structural parts and elements of the present utility model. However, these terms are used here only for the purpose of convenient description and are determined based on the exemplary orientations shown in the drawings. Since the embodiments disclosed by the present utility model can be arranged in different directions, these terms indicating directions are only used as explanations and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity.

[0030] Figures 1-7 A preferred embodiment of the range hood of the present utility model is shown. The range hood includes a housing and a centrifugal fan disposed inside the housing. The housing generally includes a fan frame 11 and a smoke collecting hood 12 disposed at the bottom of the fan frame 11. The inner cavity of the fan frame 11 is communicated with the inner cavity of the smoke collecting hood 12. An air inlet is formed on the front side wall of the smoke collecting hood 12, and external flue gas can enter the smoke collecting hood 12 through the air inlet. The centrifugal fan is disposed inside the fan frame 11. When the centrifugal fan operates, a negative pressure is generated, and external cooking fumes can be sucked into the smoke collecting hood 12 through the air inlet. An oil cup is disposed at the bottom of the smoke collecting hood 12. The oil cup is in a long strip shape extending left and right and is used to receive the oil stains flowing down from the smoke collecting hood 12. A smoke baffle 13 that can deflect forward and backward relative to the smoke collecting hood 12 is further disposed at the front part of the smoke collecting hood 12. The smoke baffle 13 is rotatably connected to the main body of the smoke collecting hood 12 and can be driven by a drive device to deflect forward to open the above-mentioned air inlet and deflect backward to block and close the above-mentioned air inlet.

[0031] The driving device includes a driving motor 20 and a power transmission assembly. The power transmission assembly includes a worm and worm gear transmission assembly, a gear transmission assembly, a sliding shaft 24, a driving rod 25, a connecting rod 27, and a rocker 28. The rocker 28 is integrally U-shaped. One end thereof is connected to a smoke plate bracket 130 on the back of the smoke baffle 13, and the other end is rotatably connected to the smoke collecting hood 12 through a pin extending left and right. In this embodiment, there are two rockers 28, which are respectively arranged on the left and right sides of the smoke baffle 13. The worm and worm gear transmission assembly and the gear transmission assembly are arranged on a vertically extending vertical plate 122 in the smoke collecting hood 12 and are fastened by a protective cover 29. The worm and worm gear transmission assembly includes a worm 22 and a worm wheel 21 drivingly connected to the worm 22. The main body of the driving motor 20 is arranged outside the protective cover 29, and its output shaft extends into the protective cover 29 and is connected to the worm 22. The gear transmission assembly includes a plurality of meshing gears, wherein the gear for power output meshes with the worm wheel 21, and the gear for power output (power output gear 230) meshes with a clutch gear 241.

[0032] The sliding shaft 24 extends in the left-right direction. The right end portion thereof extends into the protective cover 29, and a guide bushing for inserting the right end portion of the sliding shaft 24 is also arranged in the protective cover 29. The clutch gear 241 is mounted on the sliding shaft 24 and can rotate and axially move along the sliding shaft 24. The sliding shaft 24 is connected to the first end of the driving rod 25 and can be deflected by the rotation of the sliding shaft 24. The second end of the driving rod 25 is rotatably connected to the first end of the connecting rod 27, and the second end of the connecting rod 27 is rotatably connected to the rocker 28. The axes of relative rotation between the driving rod 25 and the connecting rod 27 and the axes of relative rotation between the connecting rod 27 and the rocker 28 both extend in the left-right direction. When the driving motor 20 rotates forward and backward, power is transmitted to the sliding shaft 24 through the worm and worm gear transmission assembly and the gear transmission assembly, driving the sliding shaft 24 to rotate. Then, during the rotation of the sliding shaft 24, the rocker 28 and the smoke baffle 13 are driven to deflect back and forth through the driving rod 25 and the connecting rod 27. A first through hole 250 for the sliding shaft 24 to pass through is formed at the first end of the driving rod 25. Correspondingly, a sliding hole 240 extending along the length direction of the sliding shaft 24 is formed in the sliding shaft 24. A limit pin 26 is also arranged at the first end of the driving rod 25, and the limit pin 26 is inserted into the sliding hole 240. When the sliding shaft 24 rotates, power can be transmitted to the driving rod 25 through the limit pin 26. Since the driving rod 25, the connecting rod 27, and the rocker 28 are fixed relative to the smoke baffle 13 and cannot move in the left-right direction, the structural design of the first through hole 250 and the sliding hole 240 on the sliding shaft 24 enables the sliding shaft 24 to relatively slide axially relative to the driving rod 25.

[0033] See Figure 3 and Figure 4, the clutch gear 241 of this embodiment can move with the sliding shaft 24 between the locked position and the unlocked position. When the clutch gear 241 is in the locked state, the clutch gear 241 meshes with the power output gear 230, and the drive motor 20 operates to drive the smoke baffle 13 to open and close; when the clutch gear 241 is in the unlocked state, the clutch gear 241 disengages from the power output gear 230. In this state, the clutch gear 241 and the sliding shaft 24 can rotate freely. The user can manually rotate the sliding shaft 24 to adjust the opening angle of the smoke baffle 13, or directly apply a force to the smoke baffle 13 to adjust its opening angle. After the adjustment is completed, the clutch gear 241 is re-engaged with the power output gear 230 again. Generally speaking, the rotation of the worm 22 can drive the rotation of the worm gear 21, and vice versa. Therefore, the above structural design realizes the free rotation in both forward and reverse directions by translating the clutch gear 241 inward and outward to disengage it from the upper-level power output gear 230. In particular, the self-locking characteristic of the worm gear 21 and the worm 22 is utilized, so that the smoke baffle 13 has no tendency or action to close after it is opened, ensuring the normal operation of the range hood.

[0034] In order to facilitate the user to move the sliding shaft 24 in the left-right direction, an operation knob 32 is provided outside the left side wall 121 or the right side wall of the housing. The operation knob 32 is connected to the end of the sliding shaft 24. Pulling the operation knob 32 inward and outward can drive the sliding shaft 24 to move axially. Similarly, rotating the operation knob 32 can also drive the sliding shaft 24 to rotate around its own axis. Specifically, the left side wall 121 of the housing is provided with an installation hole 1210, and a fixing plate 31 is provided at the installation hole 1210. Specifically, the fixing plate 31 can be fixed to the left side wall 121 of the housing by screws. The fixing plate 31 is axially hollow and opposite to the installation hole 1210. The sliding shaft 24 (or through an external connecting shaft or connecting sleeve) passes through the installation hole 1210 and the fixing plate 31 and is connected to the operation knob 32.

[0035] The outer peripheral edge of the fixed disk 31 has an annular flange 311 that extends by folding towards the side where the operating knob 32 is located, and the operating knob 32 abuts against the end of the annular flange 311. An elastic member is also provided between the fixed disk 31 and the operating knob 32. Under the action of the elastic member, the operating knob 32 always has a tendency to move towards the fixed disk 31. More specifically, a first chute 312 is provided on the side wall of the fixed disk 31 facing the operating knob 32 and is circumferentially arranged, and a first slider 313 is slidably limited in the first chute 312. A second chute 321 is provided on the side wall of the operating knob 32 facing the fixed disk 31 and is circumferentially arranged, and a second slider 322 is slidably limited in the second chute 321. The elastic member is a tension spring 33. In this embodiment, four tension springs 33 are arranged at intervals in the circumferential direction. One end of each tension spring 33 is connected to the first slider 313 on the fixed disk 31, and the other end is connected to the second slider 322 on the operating knob 32. The arrangement of the above sliders and chutes also ensures that when the operating knob 32 rotates, the tension spring 33 will not be severely distorted, ensuring that the rotation operation of the knob is more labor-saving.

[0036] After manually adjusting the angle of the smoke baffle 13, directly release the operating knob 32. The operating knob 32 moves to the right under the elastic force of the tension spring 33 and abuts against the fixed disk 31 again. At the same time, the sliding shaft 24 and the clutch gear 241 also move to the right and automatically reset to the initial position. The setting of the tension spring 33 ensures that the clutch operation of the drive device is more labor-saving, making the control of the sliding shaft 24 for driving the deflection of the smoke baffle 13 simpler. There are only two actions: pulling and rotating. When the user releases the operating knob 32, under the action of the tension spring 33, the clutch gear 241 on the sliding shaft 24 re-engages with the corresponding power output gear 230, so that the smoke baffle 13 can be fixed in this position.

[0037] To avoid the problem of slipping during the rotation of the operating knob 32, the outer peripheral wall of the operating knob 32 in this embodiment is cylindrical, and anti-slip threads 320 are provided thereon.

[0038] Generally speaking, the probability of a failure of the drive motor 20 or the gear set is the highest, such as short circuit of the small motor, wear of the bearing, and damage of the stator core, etc. The gear set is worn and deformed and cannot be engaged. At this time, the smoke baffle 13 cannot be opened. The drive device in this embodiment drives the sliding shaft 24 to move axially by operating the operating knob 32, so that the clutch gear 241 on the sliding shaft 24 engages or disengages with the power output gear 230. In this way, the opening and closing actions of the smoke baffle 13 can be manually operated without making major changes to other parts, which is applicable to the emergency situation where the smoke baffle 13 cannot be opened due to a failure of the motor or power transmission of the drive device. When the smoke baffle 13 cannot be automatically opened and closed, the method of manually opening the smoke baffle 13 is as follows:

[0039] 1. The user holds the operation knob 32 with a hand and pulls it outwards;

[0040] 2. The operation knob 32 drives the sliding shaft 24 and the clutch gear 241 thereon to move outwards together for a certain distance. At this time, the clutch gear 241 disengages from the upper-stage power output gear 230;

[0041] 3. Since a sliding hole 240 is provided on the sliding shaft 24 and the driving rod 25 is indirectly fixed to the machine housing in a non-rotating direction, the sliding shaft 24 can freely translate inwards and outwards relative to the driving rod 25;

[0042] 4. After the user pulls out the operation knob 32, the user rotates the operation knob 32 to open the smoke baffle 13 to a fixed position;

[0043] 5. The user pushes the operation knob 32 inwards, so that the clutch gear 241 moves to its original position, the clutch gear 241 resumes meshing with the upper-stage power output gear 230, and the smoke baffle 13 stops rotating and its position is fixed.

Claims

1. A range hood, comprising: a housing having an air inlet at the front; A smoke baffle (13) driven by a driving device and capable of rotating forward and backward relative to the housing, thereby opening or closing the air inlet; The invention is characterized in that: the driving device comprises a driving motor (20) and a power transmission component, the power transmission component comprises a power output gear (230), a sliding shaft (24) that can rotate around its own axis, and a clutch gear (241) installed on the sliding shaft (24), the power output gear (230) is connected to the output shaft of the driving motor (20) and rotates under the drive of the driving motor (20), and the smoke shield (13) is connected to the sliding shaft (24) so ​​that it can be driven by the rotation of the sliding shaft (24). The clutch gear (241) can move between a locked position and an unlocked position along with the sliding shaft (24); when the clutch gear (241) is in a locked state, the clutch gear (241) is meshed with the power output gear (230); when the clutch gear (241) is in an unlocked state, the clutch gear (241) is disengaged from the power output gear (230); and the driving device further comprises an operating knob (32) connected to the sliding shaft (24) and used for driving the sliding shaft (24) to move along its axial direction.

2. The range hood according to claim 1, characterized in that: The sliding shaft (24) is arranged in the housing and extends in the left-right direction. The operating knob (32) is arranged outside the left side wall (121) or the right side wall of the housing and is connected to the end of the sliding shaft (24).

3. The range hood according to claim 2, characterized in that: A mounting hole (1210) is provided on the left side wall (121) or the right side wall of the housing, a fixing plate (31) is provided at the mounting hole (1210), the fixing plate (31) is axially hollow and opposite to the mounting hole (1210), the sliding shaft (24) passes through the mounting hole (1210) and the fixing plate (31) and is connected to the operating knob (32), and the operating knob (32) is in sliding contact with the fixing plate (31).

4. The range hood according to claim 3, characterized in that: The outer peripheral edge of the fixing plate (31) has an annular flange (311) that is folded and extended toward the side where the operating knob (32) is located, and the operating knob (32) abuts against the end of the annular flange (311).

5. The range hood according to claim 3, characterized in that: It also includes an elastic member disposed between the fixed disk (31) and the operating knob (32); under the action of the elastic member, the operating knob (32) always has a tendency to move toward the fixed disk (31).

6. The range hood according to claim 5, characterized in that: A first sliding groove (312) opened along the circumferential direction and a first sliding block (313) slidably limited in the first sliding groove (312) are provided on a side wall of the fixed disk (31) facing the operating knob (32); a second sliding groove (321) opened along the circumferential direction and a second sliding block (322) slidably limited in the second sliding groove (321) are provided on a side wall of the operating knob (32) facing the fixed disk (31); the elastic member is a tension spring (33); one end of the tension spring (33) is connected to the first sliding block (313), and the other end is connected to the second sliding block (322).

7. The range hood according to claim 5, characterized in that: The outer peripheral wall of the operating knob (32) is columnar and is provided with anti-slip grooves (320).

8. The range hood according to any one of claims 1 to 7, characterized in that: The smoke baffle (13) is connected to the casing by a rocking arm (28) so as to be rotatable around a first axis extending leftward and rightward. The driving device also includes a driving rod (25) and a connecting rod (27). The sliding shaft (24) is connected to the first end of the driving rod (25) and can be driven by the sliding shaft (24) to deflect. The sliding shaft (24) can also slide relative to the driving rod (25) in the axial direction of the sliding shaft (24). The second end of the driving rod (25) is rotatably connected to the first end of the connecting rod (27), and the second end of the connecting rod (27) is rotatably connected to the rocking arm (28).

9. The range hood according to claim 8, characterized in that: The first end of the driving rod (25) is formed with a first through hole (250) for the sliding shaft (24) to pass through, the sliding shaft (24) is provided with a sliding hole (240) extending along its length direction, and the first end of the driving rod (25) is also provided with a limit pin (26), and the limit pin (26) is inserted into the sliding hole (240).

10. The range hood according to any one of claims 1 to 7, characterized in that: The power transmission assembly comprises a worm gear transmission assembly and a gear transmission assembly, wherein the worm gear transmission assembly comprises a worm (22) connected to the output shaft of the drive motor (20) and a worm wheel (21) meshing with the worm (22), and the worm wheel is connected to the transmission of the gear transmission assembly.

11. The range hood according to claim 10, characterized in that: It also includes a protective cover (29) which is arranged outside the worm gear transmission assembly and the gear transmission assembly.

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