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; a screw rod; the movable nut is in threaded fit with the lead screw; the telescopic pipe is arranged on the movable nut in a sleeving mode and keeps the trend of synchronous linear movement; at least part of the telescopic pipe is located in the shell; the telescopic pipe penetrates out of the shell from the dustproof sealing cover; open holes are formed in the pipe wall of the telescopic pipe; the device further comprises a rotary expansion assembly arranged in the telescopic pipe, the rotary expansion assembly comprises connecting rods, ejector blocks and a moving rod, one connecting rod in one set is rotationally connected with the interior of the telescopic pipe, the other connecting rod in one set is rotationally connected with the moving rod, and the ends, close to each other, of the two connecting rods are rotationally connected with the same ejector block. When the telescopic pipe and the dustproof sealing cover are clamped, the movable nut can drive the movable rod to move, the included angle of the set of connecting rods is changed, so that the ejector block protrudes out of the peripheral wall of the telescopic pipe from the open hole, and the telescopic pipe and the dustproof sealing cover are ejected open.

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 by an electric push rod to open and close the smoke baffle. 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 provided 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 in line with individual use habits and improve 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 scheme 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 able to move linearly along the screw rod;

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

[0012] a housing in which the screw rod, the moving nut and at least part of the telescopic tube are located, and to one end of which the motor is connected; and

[0013] a dustproof sealing cover arranged at the end of the housing away from the motor, and from which the telescopic tube extends out of the housing; characterized in that:

[0014] an opening is arranged on the wall of the telescopic tube, which corresponds to the dustproof sealing cover when the telescopic tube is retracted into the housing to a limit position;

[0015] the electric push rod further comprises a rotating expansion assembly arranged in the telescopic tube, which comprises connecting rods, a top block and a moving rod capable of moving linearly along the axis of the screw rod, two connecting rods constitute a group, one end of one connecting rod in the group is rotationally connected with a fixed position in the telescopic tube, one end of the other connecting rod in the group is rotationally connected with the end of the moving rod away from the moving nut, and the ends of the two connecting rods close to each other are respectively rotationally connected with the same top block; when the telescopic tube is stuck with the dustproof sealing cover, the moving nut can move along the axis of the screw rod relative to the telescopic tube, so as to cooperate with the moving rod to drive the moving rod to move, and the top block protrudes from the outer peripheral wall of the telescopic tube by changing the included angle of the connecting rods in the group, thereby toppling the telescopic tube and the dustproof sealing cover.

[0016] By arranging the rotating expansion assembly, when the telescopic tube is stuck with the dustproof sealing cover and thus cannot be driven to extend out of the housing any more, the moving nut and the moving rod are used to cooperate, and then the top block on the connecting rod is protruded out of the telescopic tube by rotating the connecting rod of the rotating expansion assembly, thereby toppling the dustproof sealing cover, realizing automatic repair of the sticking, and after the repair of the sticking, the moving nut and the telescopic tube are automatically reset to the initial state without manual operation.

[0017] Preferably, to facilitate uniform pushing of the dustproof sealing cover, the combination of the top block and the two connecting rods has at least two groups of rotational symmetry.

[0018] Further, to avoid rotation of the telescopic tube and the moving nut in the normal working state, the telescopic tube is matched with a key groove of the housing, and the moving nut keeps a tendency of only synchronous linear movement with the telescopic tube.

[0019] Further, to ensure the straight line movement of the mobile nut and the telescopic tube, the mobile nut comprises a first part, a second part and a third part arranged coaxially, the outer diameter of the second part is smaller than the first part and the third part, the telescopic tube is sleeved on the outer periphery of the second part and the third part, the end of the third part adjacent to the second part of the mobile nut is provided with a first gear, and the end of the telescopic tube in the shell is provided with a second gear, the first gear and the second gear keep the tendency of engagement, so that the mobile nut keeps the tendency of only synchronous straight line movement with the telescopic tube.

[0020] Further, to avoid the telescopic tube and the mobile nut from disengaging during relative straight line movement, the end of the telescopic tube 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 telescopic tube, and a spring is arranged between the first part of the mobile nut and the end of the telescopic tube, so that the first gear and the second gear keep the tendency of engagement.

[0021] To facilitate the cooperation of the mobile nut with the moving rod to push the straight line movement of the moving rod during the movement of the mobile nut relative to the telescopic tube, the rotating expansion assembly further comprises a transmission member, the transmission member can rotate relative to the telescopic tube around the axis of the screw rod, the transmission member 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, the transmission member comprises a fourth gear arranged at one end thereof towards the mobile nut, the third gear and the fourth gear can engage and disengage, and the transmission member is threadedly connected with the moving rod.

[0022] To facilitate the transmission member to transmit motion to the moving rod, the transmission member further comprises a transmission disc and a transmission rod, the fourth gear is formed on the side of the transmission disc towards the mobile nut, and the transmission rod is formed on the side of the transmission disc away from the mobile nut, the transmission rod extends into the moving rod and the two are threadedly connected, when the transmission member rotates, the moving rod can be driven to move in a straight line along the axis of the screw rod.

[0023] To facilitate the resetting of the rotating expansion assembly after the stuck repair, the rotating expansion assembly further comprises a coil spring, the outer end of the coil spring is directly or indirectly fixed with the telescopic tube, and the inner end of the coil spring is connected with the transmission member.

[0024] Preferably, in order to prevent dust sealing cover from clamping telescopic pipe and playing a dustproof sealing role, 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 telescopic pipe, the elastic clamp comprises an outer ring spring sheet and an inner ring spring sheet, the outer ring spring sheet is in a wavy ring shape, the inner ring spring sheet is arranged in the outer ring spring sheet, the inner ring spring sheet is in an arc shape, the number and position of the inner ring spring sheet correspond to the holes, and the outer ring spring sheet abuts against the cover body, the inner ring spring sheet is pressed inward to clamp the outer peripheral wall of the telescopic pipe.

[0025] The utility model discloses a kind of suction hoods, including movable component, it is characterized in that: the electric push rod for suction hood is applied as described above, to drive movable component.

[0026] Compared with prior art, the utility model has the advantages that: by setting rotary expansion component, when telescopic pipe and dustproof sealing cover are stuck and telescopic pipe cannot be driven to stretch out from shell, mobile nut and moving rod are cooperated, and then the top block on connecting rod is pushed out to telescopic pipe by the rotation of connecting rod of rotary expansion component, and then dustproof sealing cover is pried, stuck automatic repair is realized, and after stuck repair, mobile nut and telescopic pipe are automatically reset to initial state, without manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the schematic diagram of electric push rod of the utility model embodiment;

[0028] Figure 2 It is the sectional view of electric push rod of the utility model embodiment;

[0029] Figure 3 It is the schematic diagram of hidden casing of electric push rod of the utility model embodiment;

[0030] Figure 4 It is Figure 3 The exploded view schematic diagram;

[0031] Figure 5 It is the schematic diagram of mobile nut of electric push rod of the utility model embodiment;

[0032] Figure 6 It is the sectional view of telescopic pipe of electric push rod of the utility model embodiment;

[0033] Figure 7 It is the schematic diagram of elastic clamp of electric push rod of the utility model embodiment;

[0034] Figure 8 It is the schematic diagram of rotary expansion component of electric push rod of the utility model embodiment;

[0035] Figure 9 It is the exploded structural schematic view of the rotating expansion assembly of the electric push rod of the embodiment of the utility model;

[0036] Figure 10 It is the sectional front view (normal state) of the electric push rod of the embodiment of the utility model;

[0037] Figure 11 It is the sectional front view (repair state) of the electric push rod of the embodiment of the utility model;

[0038] Figure 12 It is Figure 10 The local I enlarged schematic view of

[0039] Figure 13 It is Figure 11 The local II enlarged schematic view of DETAILED DESCRIPTION

[0040] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions.

[0041] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, since the embodiments disclosed by the utility model can be arranged in different directions, so these orientation indicating terms are only as an illustration and should not be regarded as a limitation, 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 be explicitly or implicitly include one or more features.

[0042] Referring to Figures 1-9 An electric push rod can be used for a range hood, and can drive movable components of the range hood to overturn and lift, etc.

[0043] The electric push rod comprises a motor 1, a housing 2, a screw rod 3, an extension tube 5, 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 axis by engaging a worm wheel 81 and a worm 82. The worm 82 is coaxial with the output shaft of the motor 1, and 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 the moving nut 6 can move linearly along the screw rod 3 when the screw rod 3 rotates. The worm wheel 81, the worm 82, the screw rod 3 and the moving nut 6 are all arranged in the housing 2.

[0044] The extension tube 5 is partially located in the housing 2 and partially extends out of the housing 2, and is sleeved on the moving nut 6 and can relatively move along the axial direction of the screw rod 3 within a limited distance. The moving nut 6 comprises a first part 61, a second part 62 and a third part 63 which are coaxially and sequentially arranged in one piece. The outer diameter of the second part 62 is smaller than that of the first part 61 and the third part 63, and the extension tube 5 is sleeved on the outer periphery of the second part 62 and the third part 63. The first part 61 and the second part 62 are used for threadedly cooperating with the screw rod 3, and the third part 63 can be arranged radially spaced apart from the screw rod 3. The end of the extension tube 5 located in the housing 2 is formed with a radially inwardly protruding annular flange 511, and the end of the third part 63 adjacent to the second part 62 can abut against the annular flange 511 of the extension tube 5 inside the extension tube 5, so as to prevent the moving nut 6 and the extension tube 5 from being separated. A spring 9 is arranged between the first part 61 of the moving nut 6 and the end of the extension tube 5, for avoiding relative movement of the two along the axial direction of the screw rod 3 in a normal state.

[0045] A limiting groove 512 is formed on the outer peripheral wall of the extension tube 5, which can be matched with a key groove of the housing 2, so as to limit the rotation of the extension tube 5 relative to the housing 2. The end of the third part 63 of the moving nut 6 adjacent to the second part 62 is provided with a first gear 64, and the annular flange 511 of the extension tube 5 is provided with a second gear 513. 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 rotation of the moving nut 6.

[0046] A 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 telescopic tube 5, and the telescopic tube 5 extends out of the dustproof sealing cover 7 through the dustproof sealing cover 7. 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, and the inner ring spring sheet 722 is arranged in the outer ring spring sheet 721 and is arc-shaped. The number and position of the inner ring spring sheet 722 correspond to the holes 514 (top block 44) described below, and the inner ring spring sheet 722 is arranged in rotational symmetry. In the 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 telescopic tube 5, so as to limit the telescopic tube 5 to avoid shaking and avoid impurities from being brought into the shell 2.

[0047] A rotating expansion assembly is arranged in the telescopic tube 5, and comprises a moving rod 41, a transmission member 42, a connecting rod 43, a top block 44 and a coil spring 45. The transmission member 42 can rotate relative to the telescopic tube 5 about the axis of the screw rod 3. The transmission member 42 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 42 comprises a fourth gear 421 arranged at one end thereof facing the moving nut 6. The third gear 65 and the fourth gear 421 can be engaged and separated. The transmission member 42 further comprises a transmission disc 422 and a transmission rod 423. The transmission disc 422 is coaxially arranged with the screw rod 3. The fourth gear 421 is formed on the side of the transmission disc 422 facing the moving nut 6, and the transmission rod 423 is formed on the side of the transmission disc 422 away from the moving nut 6. The transmission rod 423 extends into the moving rod 41 and is threadedly connected with the moving rod 41. Thus, when the transmission member 42 rotates, the moving rod 41 can be driven to move linearly along the axis of the screw rod 3.

[0048] The connecting rod 43 has at least two. One end of one of the connecting rods 43 is rotationally connected with a fixed position in the telescopic tube 5 (which can be achieved by arranging a support or the like), and one end of the other connecting rod 43 is rotationally connected with the end of the moving rod 41 away from the transmission disc 422. The ends of the two connecting rods 43 close to each other are respectively rotationally connected with a top block 44. The combination of the top block 44 and the two connecting rods 43 has at least two groups of rotational symmetry, and in this embodiment, three groups.

[0049] Thus, when the transmission member 42 rotates, the moving rod 41 moves linearly along the axis of the screw rod 3 relative to the transmission member 42, so as to change the included angle between the two connecting rods 43 in one group, and further change the position of the top block 44 (the principle is the same as that of a hand-operated vehicle-mounted jack).

[0050] The pipe wall of the telescopic pipe 5 is provided with openings 514, the number and position of which correspond to the top block 44 respectively. When the telescopic pipe 5 is contracted to the limit position in the shell 2, the position of the opening 514 corresponds to the inner ring spring sheet 722 of the dustproof sealing cover 7. At this time, the top block 44 can pass through the opening 514, thereby opening the inner ring spring sheet 722 of the elastic clamp 72.

[0051] The coil spring 45 can be arranged on the transmission disc 422 of the transmission member 42, for resetting after the transmission member 42 rotates. The outer end of the coil spring 45 can be fixed directly or indirectly with the telescopic pipe 5, and the inner end of the coil spring 45 can be fixed with the transmission member 42.

[0052] The end of the transmission rod 423 that passes out of the moving rod 41 can be provided with a limiting nut 46, to avoid separation of the two.

[0053] Referring to Figure 10 and Figure 12 , when the electric push rod normally works, the motor 1 drives the telescopic pipe 5 to extend out of or contract into the shell 2, and the telescopic pipe 5 and the moving nut 6 are relatively static. The dustproof sealing cover 7 will inevitably be brought into dust and oil and accumulated into oil stains during daily use. If the range hood is not used for a long time or in special circumstances, the telescopic pipe 5 and the elastic clamp 72 will be adhered, and if the motor power is small, the telescopic pipe 5 will be stuck and cannot be pushed out. At this time, the above structure can break the adhered state of the telescopic pipe 5 and the dustproof sealing cover 7. Referring to Figure 11 and Figure 13 , after the telescopic pipe 5 is adhered and stuck, the motor 1 is operated, the lead screw 3 drives the moving nut 6 to move forward (shown as right in the figure) by a certain distance. Since the telescopic pipe 5 is stuck and cannot be pushed by the spring 9, the spring 9 is gradually compressed. After the moving nut 6 moves forward, it is engaged with the transmission member 42, and the moving nut 6 and the telescopic pipe 5 are no longer engaged. The rotation of the moving nut 6 is limited and released, the lead screw 3 drives the moving nut 6 to rotate, and further drives the transmission member 42 to rotate, thereby driving the moving rod 41 to move, so that the top block 44 expands outward, thereby extending the telescopic pipe 5 through the opening 514 of the telescopic pipe 5, and opening the inner ring spring sheet 722 of the elastic clamp 72, thereby breaking the adhered state of the telescopic pipe 5 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 telescopic pipe 5 again, while being separated from the transmission member 42, to realize the stuck repair; or the motor 1 can also be stopped, and the moving nut 6 retreats to the initial position under the action of the spring 9. The coil spring 45 is charged during the rotation of the transmission member 42, and is released after the stuck repair, to drive the moving rod 41, the top block 44 and the like to reset.

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 around 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 telescopic tube (5) sleeved on the moving nut (6) and kept in a tendency of synchronous linear movement; a housing (2) in which the screw rod (3), the moving nut (6) and at least part of the telescopic tube (5) are located, and to one end of which the motor (1) is connected; and a dustproof sealing cover (7) provided at an end of the housing (2) away from the motor (1), and through which the telescopic tube (5) extends out of the housing (2); characterized in that: an opening (514) is provided on a tube wall of the telescopic tube (5), and the opening (514) corresponds to the dustproof sealing cover (7) when the telescopic tube (5) is retracted into the housing (2) to a limit position; the electric push rod further comprises a rotary expansion assembly provided in the telescopic tube (5), the rotary expansion assembly comprising connecting rods (43), a top block (44) and a moving rod (41) linearly movable along an axial direction of the screw rod (3), two connecting rods (43) constituting a group, one end of one connecting rod (43) in the group being rotationally connected to a fixed position in the telescopic tube (5), one end of the other connecting rod (43) in the group being rotationally connected to an end of the moving rod (41) away from the moving nut (6), and the ends of the two connecting rods (43) close to each other being rotationally connected to the same top block (44), respectively; when the telescopic tube (5) is stuck to the dustproof sealing cover (7), the moving nut (6) is linearly movable along the axial direction of the screw rod (3) relative to the telescopic tube (5), so as to cooperate with the moving rod (41) to drive the moving rod (41) to move, and the top block (44) is protruded from the outer peripheral wall of the telescopic tube (5) through the opening (514) by changing the included angle of the group of connecting rods (43), so as to separate the telescopic tube (5) and the dustproof sealing cover (7).

2. The electric push rod for a range hood according to claim 1, characterized by: The combination of the top block (44) and the two connecting rods (43) has at least two groups of rotational symmetry.

3. The electric push rod for a range hood according to claim 1, characterized by: The telescopic tube (5) is in key groove cooperation with the housing (2), and the moving nut (6) keeps the tendency of only synchronous linear movement with the telescopic tube (5).

4. The electric push rod for a range hood according to claim 3, 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) has an outer diameter smaller than the first portion (61) and the third portion (63), the telescopic tube (5) is sleeved on the outer periphery of the second portion (62) and the third portion (63), the third portion (63) of the moving nut (6) has a first gear (64) provided at an end adjacent to the second portion (62), and the telescopic tube (5) has a second gear (513) provided at an end located in the housing (2), the first gear (64) and the second gear (513) keep the tendency of engagement, so that the moving nut (6) keeps the tendency of only synchronous linear movement with the telescopic tube (5).

5. The electric push rod for a range hood according to claim 4, characterized by: The end of the telescopic tube (5) inside the housing (2) is formed with a radially inwardly protruding annular flange (511), the end of the third portion (63) adjacent to the second portion (62) abuts against the annular flange (511) of the telescopic tube (5) inside the telescopic tube (5), a spring (9) is arranged between the first portion (61) of the moving nut (6) and the end of the telescopic tube (5), so that the first gear (64) and the second gear (513) are kept in engagement.

6. The electric push rod for a range hood according to claim 4, characterized by: The rotating and expanding assembly further comprises a transmission member (42) which can rotate relative to the telescopic tube (5) around the axis of the lead screw (3), the transmission member (42) is arranged adjacent to the third portion (63) of the moving nut (6) and on the side of the third portion (63) away from the second portion (62), the end of the third portion (63) of the moving nut (6) away from the second portion (62) is provided with a third gear (65), the transmission member (42) comprises a fourth gear (421) arranged on one end thereof towards the moving nut (6), the third gear (65) and the fourth gear (421) can be engaged and disengaged, and the transmission member (42) is threadedly connected with the moving rod (41).

7. The electric push rod for a range hood according to claim 6, characterized by: The transmission member (42) further comprises a transmission disc (422) and a transmission rod (423), the fourth gear (421) is formed on one side of the transmission disc (422) towards the moving nut (6), and the transmission rod (423) is formed on the side of the transmission disc (422) away from the moving nut (6), the transmission rod (423) extends into the moving rod (41) and is threadedly connected therewith, when the transmission member (42) rotates, the moving rod (41) can be driven to move linearly along the lead screw (3) in the axial direction.

8. The electric push rod for a range hood according to claim 7, characterized by: The rotating and expanding assembly further comprises a coil spring (45), the outer end of the coil spring (45) is directly or indirectly fixed with the telescopic tube (5), and the inner end of the coil spring (45) is connected with the transmission member (42).

9. The electric push rod for a range hood according to any one of claims 1 to 7, 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 telescopic tube (5), 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 the shape of a wave-shaped ring, the inner ring spring sheet (722) is arranged in the outer ring spring sheet (721), the inner ring spring sheet (722) is in the shape of an arc, the number and position of the inner ring spring sheet (722) correspond to those of the openings (514), and the outer ring spring sheet (721) abuts against the cover body (71) to press the inner ring spring sheet (722) inwardly so as to clamp the outer peripheral wall of the telescopic tube (5).

10. A range hood comprising a movable component, characterized in that: The electric push rod for range hood according to any one of claims 1-9 is applied to drive a movable component.

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