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; the lead screw, the movable nut and at least part of the telescopic pipe are 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 electric push rod further comprises a rotary expansion assembly arranged in the telescopic pipe. The rotary expansion assembly comprises a rotary disc capable of rotating relative to the telescopic pipe, a transmission piece synchronously rotating with the rotary disc and a sliding block meshed with the rotary disc. When the 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 telescopic pipe so as to be matched with the transmission piece to drive the rotating disc to rotate, and the sliding block meshed with the rotating disc moves to the position capable of protruding out of the outer circumferential wall of the telescopic pipe from the open hole to eject the telescopic pipe and the dustproof sealing cover 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 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 telescopic tube sleeved on the moving nut and kept in 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 through which the telescopic tube extends out of the housing; characterized in that:

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

[0015] the electric push rod further comprises a rotating expansion assembly arranged in the telescopic tube, the rotating expansion assembly comprising a rotating disc rotatable relative to the telescopic tube, a transmission member synchronously rotatable with the rotating disc, and a sliding block engaged with the rotating disc; when the telescopic tube is stuck with the dustproof sealing cover, the moving nut is movable relative to the telescopic tube along the axis of the screw rod, so as to drive the rotating disc to rotate by engaging with the transmission member, and the sliding block engaged with the rotating disc moves to the position where it can protrude from the peripheral wall of the telescopic tube through the opening, thereby separating 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 transmission member are engaged, and the sliding block of the rotating expansion assembly is used to push outwards the telescopic tube, thereby separating the dustproof sealing cover, so as to realize automatic repair of the sticking and automatic resetting of the moving nut and the telescopic tube to the initial state without manual operation.

[0017] Further, in order to facilitate the sliding disc to drive the sliding block to slide, the rotating disc comprises a disc body and a track arranged on the disc body, the track is spirally wound on the side of the disc body facing the moving nut, the sliding block comprises a sliding block body and a tooth arranged on the sliding block body, and the tooth is engaged with the track.

[0018] Further, in order to define the sliding track of the sliding block, the rotating expansion assembly comprises a sliding block support fixedly arranged in the telescopic tube, the sliding block support comprises a support body and a sliding rail formed on the support body, the sliding block body and the sliding rail are slidingly connected, and the sliding rail extends from the center of the support body to the outer edge of the support body.

[0019] Further, to avoid the rotation of the telescopic tube and the moving nut in normal working state, the telescopic tube is matched with the key groove of the shell, and the moving nut keeps the tendency of only synchronous linear movement with the telescopic tube.

[0020] Further, to ensure the synchronous linear movement of the moving nut and the telescopic tube in normal working state, the moving nut comprises a first part, a second part and a third part arranged coaxially in sequence, 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 moving nut is provided with a first gear, the end of the telescopic tube located in the shell is provided with a second gear, the first gear and the second gear keep the tendency of engagement, so that the moving nut keeps the tendency of only synchronous linear movement with the telescopic tube.

[0021] Further, to avoid the disengagement of the telescopic tube and the moving nut in relative linear movement, the end of the 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 telescopic tube in the interior of the telescopic tube, and a spring is arranged between the first part of the moving nut and the end of the telescopic tube, so that the first gear and the second gear keep the tendency of engagement.

[0022] To facilitate the engagement of the moving nut with the transmission part in relative movement with the telescopic tube, the transmission part is arranged adjacent to the third part of the moving nut and located on the side of the third part away from the second part, the end of the third part of the moving nut away from the second part is provided with a third gear, the transmission part comprises a fourth gear arranged at one end thereof towards the moving nut, and the third gear and the fourth gear can be engaged and separated.

[0023] To facilitate the resetting of the rotary expansion assembly after the stuck repair, the rotary 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 rotating disc.

[0024] Preferably, to facilitate the dustproof sealing cover clamping the telescopic tube to play 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 tube, the elastic clamp comprises an outer ring spring sheet and an inner ring spring sheet, the outer ring spring sheet is in a wave-shaped 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 to press the inner ring spring sheet inwardly to clamp the outer peripheral wall of the telescopic tube.

[0025] 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.

[0026] Compared with the prior art, the utility model has the advantages that: by setting the rotating expansion assembly, when the telescopic pipe and the dustproof sealing cover are stuck and the telescopic pipe cannot be driven to stretch out of the shell, the moving nut and the transmission member are engaged, and then the slider of the rotating expansion assembly can be used to push out of the telescopic pipe, and the dustproof sealing cover is opened, the stuck is automatically repaired, and after the stuck is repaired, the moving nut and the telescopic pipe are automatically reset to the initial state without manual operation. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

[0030] Figure 4 It is the exploded structural schematic diagram of Figure 3 ;

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

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

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

[0034] Figure 8 It is the exploded structural schematic diagram of the rotating expansion assembly of the electric push rod of the utility model embodiment;

[0035] Figure 9 It is the sectional front view (normal state) of the electric push rod of the utility model embodiment;

[0036] Figure 10 It is the local partial I enlarged schematic diagram of Figure 9 . DETAILED DESCRIPTION

[0037] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals indicate 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, so these orientation-indicating terms are only as an illustration and should not be regarded as a limitation, such as "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 of the 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 telescopic 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 own axis through the meshed worm wheel 81 and 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 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 telescopic 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, both of which 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 arranged in sequence and are integrally formed, the outer diameter of the second part 62 is smaller than that of the first part 61 and the third part 63, and the telescopic 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 telescopic 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 telescopic tube 5 in the interior of the telescopic tube 5, so as to prevent the moving nut 6 and the telescopic 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 telescopic tube 5, and is used 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 telescopic tube 5, and can be matched with a key groove formed on the housing 2, so as to limit rotation of the telescopic 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 telescopic tube 5 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 rotation of the moving nut 6.

[0043] A dustproof sealing cover 7 is arranged at the end of the housing 2 away from the motor 1, and the dustproof sealing cover 7 comprises a cover body 71 and an elastic clamp 72 arranged in the cover body 71, the elastic clamp 72 is arranged on 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 those of the following hole 514 (the sliding block 43) and are arranged in rotational symmetry. In a normal state, the outer ring spring sheet 721 abuts against the cover body 71, presses the inner ring spring sheet 722 inwardly and clamps the outer peripheral wall of the telescopic tube 5, so as to limit the telescopic tube 5 and avoid shaking and impurities from being brought into the housing 2.

[0044] The telescopic tube 5 is provided with a rotating expansion assembly, which comprises a rotating disc 41, a transmission member 42, a sliding block 43, a sliding block support 44 and a coil spring 45. The transmission member 42 is rotatable relative to the telescopic tube 5 about the axis of the screw rod 3, is arranged adjacent to the third part 63 of the moving nut 6 and is located 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, and the transmission member 42 comprises a fourth gear 421 arranged at one end thereof towards the moving nut 6, the third gear 65 and the fourth gear 421 can be engaged and separated.

[0045] The rotating disc 41 is arranged on the side of the transmission member 42 away from the moving nut 6, and the rotating disc 41 is rotatable when the transmission member 42 rotates. The rotating disc 41 comprises a disc body 411 and a track 412 arranged on the disc body 411, and the track 412 is spirally wound on the side of the disc body 411 towards the transmission member 42. The sliding block 43 is slidingly arranged on the sliding block support 44, the sliding block support 44 is fixedly arranged on the side of the rotating disc 41 towards the moving nut 6, the transmission member 42 passes through the sliding block support 44 to be in transmission connection with the rotating disc 41, and the transmission member 42 and the rotating disc 41 are synchronously rotatable and cannot be relatively rotatable. The sliding block support 44 comprises a disc-shaped support body 441 and a sliding rail 442 formed on the support body 441, and the sliding block 43 and the sliding rail 442 are slidingly connected. The sliding block 43 has at least two rotational symmetries, and each sliding block 43 is engaged with the track 412 of the rotating disc 41 in the form of a tooth. Each sliding block 43 comprises a sliding block body 431, a tooth 432 and a protrusion 433, wherein the sliding block body 431 is used for slidingly matching with the sliding rail 442, and the tooth 432 is used for engaging with the track 412 (the track 412 is also provided with a tooth). In the embodiment, the sliding rail 442 has three sliding rails, and the sliding block 43 has three corresponding sliding blocks, each sliding block 43 corresponds to one sliding rail 442. The sliding rails 442 are radially distributed on the support body 441, and each sliding rail 442 extends along the radial direction of the support body 441 (from the center of the support body 441 to the outer edge). When the rotating disc 41 is driven to rotate by the transmission member 42, the sliding block 43 can be driven to move linearly along the sliding rail 442 on the sliding block support 44.

[0046] The coil spring 45 is connected with the rotating disc 41 and is coaxially arranged with the rotating disc 41, for example, the coil spring 45 can be arranged on the side of the rotating disc 41 away from the transmission member 42, and is used for resetting after the rotating disc 41 rotates. The outer end of the coil spring 45 can be fixed with the sliding block support 44 or the telescopic tube 5, and the inner end of the coil spring 45 can be connected with the rotating disc 41.

[0047] The pipe wall of the telescopic pipe 5 is provided with openings 514, the number and position of which correspond to the sliders 43 respectively. When the telescopic pipe 5 is contracted to the limit position in the housing 2, the position of the openings 514 corresponds to the inner ring spring sheet 722 of the dustproof sealing cover 7. At this time, the slider 43 slides to the outermost edge of the sliding support 44, and the protrusion 433 of the slider 43 can pass through the opening 514, thereby pushing open the inner ring spring sheet 722 of the elastic clamp 72.

[0048] Referring to Figure 9 and Figure 10 When the electric push rod is normally working, the motor 1 drives the telescopic pipe 5 to extend or retract from the housing 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 accumulation 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 adhesion state of the telescopic pipe 5 and the dustproof sealing cover 7. Referring to Figure 2 When the telescopic pipe 5 is stuck and adhered, 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 limiting of the moving nut 6 is released, the lead screw 3 drives the moving nut 6 to rotate, and further drives the transmission member 42 to rotate, thereby driving the rotating disc 41 to rotate, driving the slider 43 to slide radially outward along the slider support 44, thereby extending the telescopic pipe 5 through the opening 514 of the telescopic pipe 5, and pushing open the inner ring spring sheet 722 of the elastic clamp 72, thereby breaking the adhesion 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, and is separated from the transmission member 42, thereby realizing the repair of the sticking; 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 energized during the rotation of the transmission member 42, and is released after the repair of the sticking, thereby driving the rotating disc 41, the slider 43 and other components 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 about its own 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: the telescopic tube (5) is provided with an opening (514) on its wall, which 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 arranged in the telescopic tube (5), which comprises a rotating disc (41) rotatable relative to the telescopic tube (5), a transmission member (42) synchronously rotatable with the rotating disc (41), and a sliding block (43) engaged with the rotating disc (41); when the telescopic tube (5) is stuck with the dustproof sealing cover (7), the moving nut (6) is linearly movable relative to the telescopic tube (5) along the axis of the screw rod (3), so as to drive the rotating disc (41) to rotate in cooperation with the transmission member (42), and the sliding block (43) engaged with the rotating disc (41) moves to a position where it can protrude from the peripheral wall of the telescopic tube (5) through the opening (514), thereby pushing apart the telescopic tube (5) and the dustproof sealing cover (7). The rotating disc (41) comprises a disc body (411) and a track (412) arranged on the disc body (411), the track (412) being spirally wound on the side of the disc body (411) facing the moving nut (6), and the sliding block (43) comprises a sliding block body (431) and a tooth (432) arranged on the sliding block body (431), the tooth (432) being engaged with the track (412). The rotary expansion assembly comprises a sliding block bracket (44) fixedly arranged in the telescopic tube (5), the sliding block bracket (44) comprising a bracket body (441) and a sliding rail (442) formed on the bracket body (441), the sliding block body (431) and the sliding rail (442) being slidingly connected, and the sliding rail (442) extending from the center of the bracket body (441) to the outer edge of the bracket body (441). The telescopic tube (5) is in key groove cooperation with the housing (2), and the moving nut (6) keeps in the tendency of synchronous linear movement with the telescopic tube (5) only. ​ ​ ​ ​ ​ 2. The electric push rod for a range hood according to claim 1, characterized by: ​ 3. The electric push rod for a range hood according to claim 2, characterized by: ​ 4. The electric push rod for a range hood according to claim 1, characterized by: ​ 5. The electric push rod for a range hood according to claim 4, characterized by: The mobile nut (6) comprises a first part (61), a second part (62) and a third part (63) arranged coaxially in sequence, the outer diameter of the second part (62) is smaller than the first part (61) and the third part (63), the telescopic tube (5) is sleeved on the outer periphery of the second part (62) and the third part (63), the end of the third part (63) of the mobile nut (6) adjacent to the second part (62) is provided with a first gear (64), the end of the telescopic tube (5) located in the shell (2) is provided with a second gear (513), the first gear (64) and the second gear (513) keep the tendency of engagement, so that the mobile nut (6) keeps the tendency of only synchronous linear movement with the telescopic tube (5).

6. The electric push rod for a range hood according to claim 5, characterized by: The end of the telescopic tube (5) 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 telescopic tube (5) inside the telescopic tube (5), a spring (9) is arranged between the first part (61) of the mobile nut (6) and the end of the telescopic tube (5), so that the first gear (64) and the second gear (513) keep the tendency of engagement.

7. The electric push rod for a range hood according to claim 5, characterized by: The transmission member (42) is arranged adjacent to the third part (63) of the mobile nut (6) and located on the side of the third part (63) away from the second part (62), the end of the third part (63) of the mobile 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 towards the mobile nut (6), the third gear (65) and the fourth gear (421) can engage and disengage.

8. The electric push rod for a range hood according to any one of claims 1 to 7, characterized by: The rotary expansion 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 rotating disc (41).

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 clamp (72) arranged in the cover body (71), the elastic clamp (72) is arranged on the outer periphery of the telescopic tube (5), 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 in a wave-shaped ring shape, the inner ring spring sheet (722) is arranged in the outer ring spring sheet (721), the inner ring spring sheet (722) is in an arc shape, the number and position of the inner ring spring sheet (722) correspond to the openings (514) respectively, the outer ring spring sheet (721) abuts against the cover body (71), and the inner ring spring sheet (722) is pressed inwardly 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 is applied to drive a movable component.

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