Electric push rod for range hood and range hood

Abstract

The utility model discloses an electric push rod for a range hood and the range hood. The electric push rod for the range hood comprises a motor; the screw rod is driven by the motor; the movable nut is arranged on the lead screw in a sleeving manner and is in threaded fit with the lead screw; the first telescopic pipe is arranged on the movable nut in a sleeving manner; the first telescopic pipe is at least partially located in the shell and can only linearly move relative to the shell; and a dustproof sealing cover; the end, away from the movable nut, of the first telescopic pipe is sleeved with a second telescopic pipe, the first telescopic pipe and the second telescopic pipe keep the trend of synchronous linear movement, and the second telescopic pipe penetrates out of the dustproof sealing cover. The electric push rod further comprises a transmission part and a planetary gear set, and when the second telescopic pipe and the dustproof sealing cover are clamped, the movable nut can move in the axial direction of the lead screw relative to the first telescopic pipe and rotate along with the lead screw so as to be meshed with the transmission part, and the planetary gear set drives the second telescopic pipe to rotate relative to the dustproof sealing cover.

Description

TECHNICAL FIELD

[0001] The utility model relates to power device especially a kind of electric push rod for range hood and range hood with the electric push rod of application. BACKGROUND

[0002] Range hood has become the necessary household appliance in resident kitchen. With the continuous progress of technology, the function of range hood is more and more diversified. For example, the commonly used side suction type range hood is provided with a reversible smoke baffle, which is driven to open and close by an electric push rod. For example, see the Chinese patent No. 201922362582.9, a submerged suction type range hood with smoke baffle, which comprises a smoke collecting hood assembly, an air inlet located at the lower part of the smoke collecting hood assembly, a smoke baffle body provided with a movable cover on the air inlet, an opening and closing mechanism arranged in the smoke collecting hood assembly to turn the smoke baffle body outward to open, and a driving mechanism for driving the opening and closing mechanism. The driving mechanism can be an electric push rod hinged to one of the fixed plates. Alternatively, the lifting type range hood adjusts the height of the range hood by using an electric push rod, so that it can adapt to users with different height requirements, thereby more conforming to individual use habits and improving the comfort of use. For example, see the Chinese patent No. 202022481273.6, a lifting assembly for lifting type range hood, which comprises a push rod motor, an electric push rod and a movable plate. One end of the electric push rod is connected to the output end of the push rod motor, and the other end is used to push the movable plate to move up and down. The movable plate is stacked in the smoke collecting hood of the range hood. The push rod motor is fixed to the box above the smoke collecting hood, thereby driving the smoke collecting hood to lift relative to the box.

[0003] After long-term use of the range hood, the internal parts are covered and contaminated by oil stains, which can cause the electric push rod to be stuck and unable to work. Although the electric push rod is provided with a dustproof sealing element, dust and oil accumulated into oil stains will inevitably be brought into the electric push rod during daily use. If the range hood is not used for a long time or in special circumstances, the telescopic tube and the sealing element will be stuck together. If the motor power is small, the telescopic tube will be stuck and unable to be pushed out.

[0004] Therefore, further improvement is needed. UTILITY MODEL CONTENTS

[0005] The first technical problem to be solved by the utility model is to provide an electric push rod for range hood, which can realize automatic repair after being stuck.

[0006] The second technical problem to be solved by the utility model is to provide a range hood with the above electric push rod.

[0007] The technical solution adopted by the utility model to solve the above first technical problem is: an electric push rod for range hood, comprising:

[0008] motor;

[0009] a screw rod driven by the motor to rotate around its axis;

[0010] a moving nut sleeved on the screw rod and threadedly engaged with the screw rod so as to be linearly movable along the screw rod;

[0011] a first telescopic tube sleeved on the moving nut and kept in a tendency of synchronous linear movement;

[0012] a housing in which the screw rod and the moving nut are located, the motor being connected to one end of the housing, and the first telescopic tube being at least partially located in the housing and being linearly movable only relative to the housing; and

[0013] a dustproof sealing cover arranged at an end of the housing away from the motor; characterized in that:

[0014] an end of the first telescopic tube away from the moving nut is sleeved with a second telescopic tube, the first telescopic tube and the second telescopic tube are kept in a tendency of synchronous linear movement, and the second telescopic tube is rotatable relative to the first telescopic tube, the second telescopic tube being led out from the dustproof sealing cover;

[0015] the electric push rod further comprises a transmission member and a planetary gear set, the planetary gear set comprising a sun gear driven to rotate by the transmission member and a plurality of planet gears respectively engaged with the sun gear and the second telescopic tube, when the second telescopic tube is stuck with the dustproof sealing cover, the moving nut is linearly movable relative to the first telescopic tube along the axial direction of the screw rod and is rotatable with the screw rod, so as to be engaged with the transmission member to drive the second telescopic tube to rotate relative to the dustproof sealing cover.

[0016] by arranging the first telescopic tube and the second telescopic tube which are kept in a tendency of synchronous movement and are rotatable relative to each other, and arranging the transmission member and the planetary gear set for driving the second telescopic tube to rotate, when the second telescopic tube is stuck with the dustproof sealing cover, the moving nut is engaged with the transmission member, and the second telescopic tube is driven to rotate relative to the dustproof sealing cover by the planetary gear set, so as to realize automatic repair of the sticking, and after the repair of the sticking, the moving nut and the first telescopic tube are automatically reset to the initial state under the action of the spring without manual operation.

[0017] Further, to avoid rotation of the first telescopic tube and the moving nut in a normal working state, the first telescopic tube is engaged with a key groove of the housing, and the moving nut is kept in a tendency of synchronous linear movement only with the first telescopic tube.

[0018] Further, to ensure that the mobile nut and the first telescopic tube move in a straight line synchronously in a normal working state, the mobile nut comprises coaxially arranged first, second and third parts in sequence, the outer diameter of the second part is smaller than that of the first and third parts, the first telescopic tube is sleeved on the outer periphery of the second and third parts, the end of the third part of the mobile nut adjacent to the second part is provided with a first gear, and the end of the first telescopic tube located in the shell is provided with a second gear, the first gear and the second gear keep a tendency of engagement, so that the mobile nut keeps a tendency of synchronous straight line movement with the first telescopic tube.

[0019] Further, to avoid disengagement of the first telescopic tube and the mobile nut when moving in a straight line relative to each other, the end of the first telescopic tube located in the shell is formed with a radially inwardly protruding annular flange, the end of the third part adjacent to the second part abuts against the annular flange of the first telescopic tube inside the first telescopic tube, and a spring is arranged between the first part of the mobile nut and the end of the first telescopic tube, so that the first gear and the second gear keep a tendency of engagement.

[0020] To facilitate engagement of the mobile nut with the transmission part when moving relative to the first telescopic tube, the transmission part is arranged in the first telescopic tube, the transmission part can rotate relative to the first telescopic tube about the axis of the screw rod, the transmission part is arranged adjacent to the third part of the mobile nut and located on the side of the third part away from the second part, the end of the third part of the mobile nut away from the second part is provided with a third gear, and the transmission part comprises a fourth gear arranged at one end thereof towards the mobile nut, the third gear and the fourth gear can be engaged and separated.

[0021] To facilitate transmission of the movement of the transmission part, the planetary gear set and the second telescopic tube, the transmission part further comprises a rotating shaft extending into the second telescopic tube, the sun gear of the planetary gear set is arranged on the rotating shaft and rotates synchronously with the rotating shaft, the end of the second telescopic tube adjacent to the first telescopic tube is provided with an inner toothed sleeve, and the planetary gear is engaged with the inner toothed sleeve.

[0022] Preferably, to facilitate dustproof sealing of the telescopic tube by the dustproof sealing cover, the dustproof sealing cover comprises a cover body and an elastic clamp arranged in the cover body, the elastic clamp is arranged on the outer periphery of the first telescopic tube, the elastic clamp comprises an outer ring spring piece and an inner ring spring piece, the outer ring spring piece is in a wave-shaped ring shape, the inner ring spring piece is arranged in the outer ring spring piece, the inner ring spring piece has at least two arc-shaped sections, the outer ring spring piece abuts against the cover body, and the inner ring spring piece is pressed inwardly so as to clamp the outer peripheral wall of the second telescopic tube.

[0023] The utility model discloses a kind of electric push rods, comprising movable component, it is characterized by: the electric push rod for range hood as described above is applied, to be used to drive movable component.

[0024] Compared with the prior art, the utility model has the advantages that: by setting the first telescopic pipe and the second telescopic pipe that can keep synchronous movement and can rotate relatively, and setting the transmission member and the planetary gear set for driving the second telescopic pipe to rotate, when the second telescopic pipe and the dustproof sealing cover are stuck, the moving nut and the transmission member are engaged, and then the second telescopic pipe can be driven to rotate relative to the shell by the planetary gear set, the automatic repair of sticking is realized, and after the repair of sticking, the moving nut and the first telescopic pipe are automatically reset to the initial state under the action of the spring, without manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the schematic diagram of electric push rod of the utility model embodiment;

[0026] Figure 2 It is the sectional view of electric push rod of the utility model embodiment;

[0027] Figure 3 It is the schematic diagram of hidden casing of electric push rod of the utility model embodiment;

[0028] Figure 4 It is Figure 3 The exploded structural schematic diagram;

[0029] Figure 5 It is the schematic diagram of moving nut of electric push rod of the utility model embodiment;

[0030] Figure 6 It is the sectional view of first telescopic pipe of electric push rod of the utility model embodiment;

[0031] Figure 7 It is the schematic diagram of elastic clamp of electric push rod of the utility model embodiment;

[0032] Figure 8 It is the schematic diagram of planetary gear set and transmission member of electric push rod of the utility model embodiment;

[0033] Figure 9 It is the sectional front view (normal state) of electric push rod of the utility model embodiment;

[0034] Figure 10 It is the sectional front view (repair state) of electric push rod of the utility model embodiment;

[0035] Figure 11 It is Figure 9 The local I enlarged schematic diagram;

[0036] Figure 12 For Figure 10 a partial II amplification schematic diagram. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference numbers represent the same or similar elements or elements having the same or similar functions.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation. Since the embodiments disclosed in the present application can be arranged in different directions, these directional terms are only used as illustrations and should not be regarded as limitations. For example, "upper", "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity. In addition, the features defined as "first", "second" can explicitly or implicitly include one or more features.

[0039] Referring to Figures 1-8 , an electric push rod can be used for a range hood to drive the movable parts of the range hood to overturn, lift, etc.

[0040] The electric push rod comprises a motor 1, a housing 2, a screw rod 3, a planetary gear set 4, a first telescopic tube 51, a second telescopic tube 52, a moving nut 6 and a dustproof sealing cover 7. The motor 1 is connected to one end of the housing 2, and its output end extends into the housing 2. The motor 1 can drive the screw rod 3 to rotate around its own axis through the meshed worm wheel 81 and worm 82. The worm 82 is coaxial with the output shaft of the motor 1, while the worm wheel 81 is fixedly arranged on the outer periphery of the screw rod 3 and rotates synchronously with the screw rod 3. The moving nut 6 is sleeved on the outer periphery of the screw rod 3 and threadedly cooperates with the screw rod 3, so that when the screw rod 3 rotates, the moving nut 6 can move linearly along the screw rod 3. The worm wheel 81, the worm 82, the screw rod 3 and the moving nut 6 are all arranged in the housing 2.

[0041] The first telescopic tube 51 is located in the shell 2 when contracted, and partially extends out of the shell 2 when extended, and is sleeved on the moving nut 6, both of which can relatively move along the axial direction of the screw rod 3 for a limited distance. The moving nut 6 comprises a first portion 61, a second portion 62 and a third portion 63 which are coaxially arranged in sequence and integrally formed, the outer diameter of the second portion 62 is smaller than that of the first portion 61 and the third portion 63, and the first telescopic tube 51 is sleeved on the outer periphery of the second portion 62 and the third portion 63. The first portion 61 and the second portion 62 are used for threadedly cooperating with the screw rod 3, and the third portion 63 can be arranged radially spaced apart from the screw rod 3. The end of the first telescopic tube 51 located in the shell 2 is formed with a radially inwardly protruding annular flange 511, and the end of the third portion 63 adjacent to the second portion 62 can abut against the annular flange 511 of the first telescopic tube 51 inside the first telescopic tube 51, so as to prevent the moving nut 6 and the first telescopic tube 51 from being separated. A spring 9 is arranged between the first portion 61 of the moving nut 6 and the end of the first telescopic tube 51, for avoiding relative movement of both along the axial direction of the screw rod 3 in a normal state.

[0042] A limiting groove 512 is formed on the outer peripheral wall of the first telescopic tube 51, and can be matched with a key groove of the shell 2, so as to limit the rotation of the first telescopic tube 51 relative to the shell 2. The end of the third portion 63 of the moving nut 6 adjacent to the second portion 62 is provided with a first gear 64, and the annular flange 511 of the first telescopic tube 51 is provided with a second gear 513, and in a normal state, the first gear 64 and the second gear 513 are engaged under the action of the spring 9, so as to avoid the rotation of the moving nut 6.

[0043] The dustproof sealing cover 7 is arranged at the end of the shell 2 away from the motor 1, the end of the first telescopic tube 51 away from the moving nut 6 is sleeved with a second telescopic tube 52, and when the first telescopic tube 51 is completely contracted in the shell 2, the end is close to the dustproof sealing cover 7, and the second telescopic tube 52 extends out of the dustproof sealing cover 7 by penetrating through the dustproof sealing cover 7. The first telescopic tube 51 and the second telescopic tube 52 can relatively rotate (the rotation axis is the axis of the screw rod 3) but cannot relatively linearly move. The end of the second telescopic tube 52 towards the first telescopic tube 51 is provided with an inner tooth sleeve 53.

[0044] The dustproof sealing cover 7 is arranged at the end of the shell 2 away from the motor 1, and comprises a cover body 71 and an elastic clamp 72 arranged in the cover body 71. The elastic clamp 72 is arranged at the outer periphery of the second telescopic tube 52. The elastic clamp 72 comprises an outer ring spring sheet 721 and an inner ring spring sheet 722. The outer ring spring sheet 721 is a wave-shaped annular spring sheet. The inner ring spring sheet 722 is arranged in the outer ring spring sheet 721 and has at least two sections, is arc-shaped, and is arranged in rotational symmetry. In a normal state, the outer ring spring sheet 721 abuts against the cover body 71, and the inner ring spring sheet 722 is pressed inward to clamp the outer peripheral wall of the first telescopic tube 51 or the second telescopic tube 52, so as to limit the first telescopic tube 51 and the second telescopic tube 52 to avoid shaking and avoid impurities being brought into the shell 2 by the second telescopic tube 52.

[0045] The electric push rod further comprises a transmission member 11. The transmission member 11 is partially arranged in the first telescopic tube 51. The transmission member 11 can rotate relative to the first telescopic tube 51 about the axis of the screw rod 3, and cannot move linearly relative to the first telescopic tube 51. The transmission member 11 is arranged adjacent to the third part 63 of the moving nut 6, at the side of the third part 63 away from the second part 62. The end of the third part 63 of the moving nut 6 away from the second part 62 is provided with a third gear 65. The transmission member 11 comprises a fourth gear 111 arranged at one end thereof facing the moving nut 6. When the third gear 65 and the fourth gear 111 are engaged, the transmission member 11 can rotate synchronously with the moving nut 6.

[0046] The transmission member 11 further comprises a rotating shaft 112 extending into the second telescopic tube 52. The planetary gear set 4 described above is arranged in the second telescopic tube 52. The planetary gear set 4 comprises a sun gear 41 and a planet gear 42. The sun gear 41 is arranged on the rotating shaft 112 and rotates synchronously with the rotating shaft 112. The planet gear 42 is engaged with the sun gear 41. The planet gear 42 is also engaged with the inner tooth sleeve 53 at the end of the second telescopic tube 52. The end of the first telescopic tube 51 adjacent to the second telescopic tube 52 can form a gear seat 514 for supporting each planet gear 42. At this time, each planet gear 42 is partially arranged in the gear seat 514 in the axial direction. The planet gear 42 can also be completely arranged in the second telescopic tube 52.

[0047] Referring to Figure 9 and Figure 11 , when the electric push rod is normally working, the motor 1 drives the first telescopic tube 51 and the second telescopic tube 52 to extend out of or retract into the shell 2, and the first telescopic tube 51, the second telescopic tube 52 and the moving nut 6 are relatively stationary. During daily use, the dustproof sealing cover 7 will inevitably be brought into dust and oil accumulated into oil dirt by the first telescopic tube 51 and the second telescopic tube 52. If the range hood is not used for a long time or in special circumstances, the second telescopic tube 52 and the elastic clamp 72 will be adhered. If the power of the motor is small, the second telescopic tube 52 will be stuck and cannot be pushed out. At this time, the above structure can break the adhered state of the second telescopic tube 52 and the dustproof sealing cover 7. Referring toFigure 10 and Figure 12 After the first telescopic tube 51 and the second telescopic tube 52 are stuck, the motor 1 is operated, the screw rod 3 drives the moving nut 6 to move forward (shown as right in the figure) a certain distance. Since the first telescopic tube 51 is stuck and cannot be pushed by the spring 9, the spring 9 is gradually compressed. After the moving nut 6 moves forward, the moving nut 6 is engaged with the transmission member 11, the moving nut 6 and the first telescopic tube 51 are no longer engaged, the rotation limiting of the moving nut 6 is released, the screw rod 3 drives the moving nut 6 to rotate, and then drives the transmission member 11 and the second telescopic tube 52 to rotate, thereby destroying the stuck state of the second telescopic tube 52 and the dustproof sealing cover 7. Then, the motor 1 is operated in reverse, so that the moving nut 6 retreats to the initial position and is engaged with the first telescopic tube 51 again, and is separated from the transmission member 11, thereby achieving the repair of the stuck.

Claims

1. An electric push rod for a range hood, comprising: a motor (1); a screw rod (3) driven by the motor (1) to rotate about its axis; a moving nut (6) sleeved on the screw rod (3) and threadedly engaged with the screw rod (3) so as to be linearly movable along the screw rod (3); a first telescopic tube (51) sleeved on the moving nut (6) and kept in a tendency of synchronous linear movement; a housing (2) in which the screw rod (3) and the moving nut (6) are located, the motor (1) being connected to one end of the housing (2), and the first telescopic tube (51) being at least partially located in the housing (2) and being linearly movable only relative to the housing (2); and a dustproof sealing cover (7) provided at an end of the housing (2) away from the motor (1); characterized in that: an end of the first telescopic tube (51) away from the moving nut (6) is sleeved with a second telescopic tube (52), the first telescopic tube (51) and the second telescopic tube (52) are kept in a tendency of synchronous linear movement, and the second telescopic tube (52) is rotatable relative to the first telescopic tube (51), the second telescopic tube (52) being led out from the dustproof sealing cover (7); the electric push rod further comprises a transmission member (11) and a planetary gear set (4), the planetary gear set comprising a sun gear (41) driven to rotate by the transmission member (11) and a plurality of planet gears (42) respectively engaged with the sun gear (41) and the second telescopic tube (52), when the second telescopic tube (52) is stuck with the dustproof sealing cover (7), the moving nut (6) is movable along the axial direction of the screw rod (3) relative to the first telescopic tube (51) and is rotatable with the screw rod (3) so as to be engaged with the transmission member (11) to drive the second telescopic tube (52) to rotate relative to the dustproof sealing cover (7).

2. The electric push rod for a range hood according to claim 1, characterized by: The first telescopic tube (51) is in key groove cooperation with the housing (2), and the moving nut (6) is kept in a tendency of synchronous linear movement only with the first telescopic tube (51).

3. The electric push rod for a range hood according to claim 2, characterized by: The moving nut (6) comprises a first portion (61), a second portion (62) and a third portion (63) arranged coaxially in sequence, the second portion (62) having an outer diameter smaller than the first portion (61) and the third portion (63), the first telescopic tube (51) being sleeved on the outer periphery of the second portion (62) and the third portion (63), the third portion (63) of the moving nut (6) having an end adjacent to the second portion (62) provided with a first gear (64), and an end of the first telescopic tube (51) located in the housing (2) provided with a second gear (513), the first gear (64) and the second gear (513) being kept in a tendency of engagement, so that the moving nut (6) is kept in a tendency of synchronous linear movement only with the first telescopic tube (51).

4. The electric push rod for a range hood according to claim 3, characterized by: The end of the first telescopic pipe (51) located in the shell (2) is formed with a radially inwardly protruding annular flange (511), the end of the third part (63) adjacent to the second part (62) abuts against the annular flange (511) of the first telescopic pipe (51) inside the first telescopic pipe (51), a spring (9) is arranged between the first part (61) of the moving nut (6) and the end of the first telescopic pipe (51), so that the first gear (64) and the second gear (513) are kept in engagement.

5. The electric push rod for a range hood according to claim 3, characterized in that: The transmission member (11) is partially arranged in the first telescopic pipe (51) and can rotate relative to the first telescopic pipe (51) around the axis of the screw rod (3), the transmission member (11) is arranged adjacent to the third part (63) of the moving nut (6) and on the side of the third part (63) away from the second part (62), the end of the third part (63) of the moving nut (6) away from the second part (62) is provided with a third gear (65), the transmission member (11) comprises a fourth gear (111) arranged at one end thereof towards the moving nut (6), the third gear (65) and the fourth gear (111) can be engaged and separated.

6. The electric push rod for a range hood according to claim 5, characterized by: The transmission member (11) further comprises a rotating shaft (112) extending into the second telescopic pipe (52), the sun gear (41) of the planetary gear set (4) is arranged on the rotating shaft (112) and rotates synchronously with the rotating shaft (112), the end of the second telescopic pipe (52) adjacent to the first telescopic pipe (51) is provided with an inner toothed sleeve (53), the planetary gear (42) is engaged with the inner toothed sleeve (53).

7. The electric push rod for a range hood according to any one of claims 1 to 6, characterized by: The dustproof sealing cover (7) comprises a cover body (71) and an elastic clip (72) arranged in the cover body (71), the elastic clip (72) is arranged on the outer periphery of the first telescopic pipe (51), the elastic clip (72) comprises an outer ring spring sheet (721) and an inner ring spring sheet (722), the outer ring spring sheet (721) is in a wavy annular shape, the inner ring spring sheet (722) is arranged in the outer ring spring sheet (721), the inner ring spring sheet (722) has at least two arc-shaped sections, the outer ring spring sheet (721) abuts against the cover body (71) and presses the inner ring spring sheet (722) inwardly to clamp the outer peripheral wall of the second telescopic pipe (52).

8. A range hood comprising a movable component, characterized in that: The electric push rod for range hood is applied to drive a movable component.

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