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 first telescopic pipe is arranged on the movable nut in a sleeving mode and keeps the trend of synchronous linear movement; 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 an inclined face speed reduction assembly arranged in the first telescopic pipe, the inclined face speed reduction assembly comprises a sliding block, an ejector block and a driving sleeve, and the sliding block penetrates through the ejector block and is matched with the driving sleeve and the ejector block in an inclined face mode. 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 so as to be matched with the driving sleeve to drive the driving sleeve to move, and the second telescopic pipe is jacked outwards by the jacking block through the sliding block.

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] screw rod, driven by the motor to rotate around its axis;

[0010] 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] first telescopic tube, sleeved on the moving nut and kept in a synchronous linear movement;

[0012] 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] dustproof sealing cover, provided at the 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 being kept in a synchronous linear movement, and the second telescopic tube being led out from the dustproof sealing cover;

[0015] the electric push rod further comprises an inclined surface deceleration assembly provided in the first telescopic tube, the inclined surface deceleration assembly comprising a sliding block, a top block and a driving sleeve linearly movable along the axis of the screw rod, the sliding block penetrating through the top block, and the sliding block being inclinedly engaged with the driving sleeve and the top block respectively; when the second telescopic tube is stuck with the dustproof sealing cover, the moving nut is linearly movable along the axis of the screw rod relative to the first telescopic tube, so as to be engaged with the driving sleeve, to drive the driving sleeve to move, and to make the top block push the second telescopic tube outward through the sliding block.

[0016] by providing the first telescopic tube and the second telescopic tube which are capable of keeping synchronous movement and are linearly movable relative to each other under axial external force, and by providing the inclined surface deceleration assembly, the direction of the force transmitted is changed, so that when the second telescopic tube is stuck with the dustproof sealing cover, the moving nut and the driving sleeve are engaged (indirectly engaged), and the sliding block changes the direction of movement for the first time, the top block changes the direction for the second time, and then the moving nut is moved to push the second telescopic tube, the pushing force of the motor is amplified, and the second telescopic tube is further moved out of the housing, the stuck state is automatically repaired, and after the stuck state is repaired, the moving nut and the second telescopic tube are automatically reset to the initial state without manual operation.

[0017] in order to facilitate the inclined surface engagement of the driving sleeve, the sliding block and the top block, the sliding block is located in the driving sleeve and is inclinedly engaged with the driving sleeve, so that the sliding block is driven by the driving sleeve to move in a direction perpendicular to the screw rod, and the sliding block is capable of driving the top block to linearly move along the axis of the screw rod.

[0018] Further, the top block can abut against the corresponding end surface of the second telescopic pipe to drive the second telescopic pipe outward.

[0019] Further, the first telescopic pipe is matched with the key groove of the shell to avoid rotation of the first telescopic pipe and the moving nut in the normal working state.

[0020] Further, the moving nut comprises coaxially arranged first, second and third parts, the outer diameter of the second part is smaller than that of the first and third parts, the first telescopic pipe is sleeved on the outer periphery of the second and third parts, the third part of the moving nut is provided with a first gear at the end adjacent to the second part, and the end of the first telescopic pipe located in the shell is provided with a second gear, the first and second gears keep the tendency of engagement, so that the moving nut keeps the tendency of synchronous linear movement with the first telescopic pipe.

[0021] Further, the end of the first telescopic pipe 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 pipe inside the first telescopic pipe, and the first spring is arranged between the first part of the moving nut and the end of the first telescopic pipe, so that the first and second gears keep the tendency of engagement.

[0022] Further, the inclined surface reduction assembly further comprises a transmission member arranged in the first telescopic pipe, the transmission member can rotate relative to the first telescopic pipe around the axis of the wire rod, the transmission member 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 member comprises a fourth gear arranged at one end thereof towards the moving nut, the third and fourth gears can engage and disengage, and the transmission member is threadedly matched with the drive sleeve.

[0023] Further, the transmission member further comprises a transmission disc and a transmission rod, the fourth gear is formed at one side of the transmission disc towards the moving nut, the transmission rod is formed at the side of the transmission disc away from the moving nut, the transmission rod extends into the drive sleeve and is threadedly connected with the drive sleeve.

[0024] Further, the inclined surface reduction assembly further comprises a coil spring, the outer end of the coil spring is directly or indirectly fixed with the first telescopic pipe, and the inner end of the coil spring is connected with the transmission member.

[0025] Preferably, in order to play a dustproof sealing role for clamping the dustproof sealing cover and the telescopic pipe, 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 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 has at least two arc-shaped sections, the outer ring spring sheet abuts against the cover body, and the inner ring spring sheet is pressed inward to clamp the outer peripheral wall of the second telescopic pipe.

[0026] 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 be used to drive movable component.

[0027] 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 relatively move under axial external force, and setting the inclined plane deceleration assembly, the direction of the force transmitted is changed, so that when the second telescopic pipe and the dustproof sealing cover are stuck, the moving nut and the driving sleeve are cooperated (indirectly cooperated), and then the sliding block can change the movement direction for the first time, the top block changes direction for the second time, and then moves to be able to push the second telescopic pipe, the pushing force of the motor is amplified to make the second telescopic pipe further move out of the shell, realize stuck automatic repair, and after stuck repair, the moving nut and the second telescopic pipe are automatically reset to the initial state, without manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the schematic diagram of electric push rod of the utility model embodiment;

[0029] Figure 2 It is the sectional view of electric push rod of the utility model embodiment;

[0030] Figure 3 It is the schematic diagram of hidden casing of electric push rod of the utility model embodiment;

[0031] Figure 4 It is Figure 3 The exploded structural schematic diagram;

[0032] Figure 5 It is the schematic diagram of moving nut of electric push rod of the utility model embodiment;

[0033] Figure 6 It is the sectional view of first telescopic pipe of electric push rod of the utility model embodiment;

[0034] Figure 7 It is the schematic diagram of elastic clamp of electric push rod of the utility model embodiment;

[0035] Figure 8 Figure 2 is a schematic view of a slope deceleration assembly of the electric push rod according to an embodiment of the present application;

[0036] Figure 9 Figure 3 is an exploded structural schematic view of the slope deceleration assembly of the electric push rod according to an embodiment of the present application;

[0037] Figure 10 Figure 4 is a sectional front view of the electric push rod according to an embodiment of the present application (normal state);

[0038] Figure 11 Figure 5 is a sectional front view of the electric push rod according to an embodiment of the present application (repair state);

[0039] Figure 12 Figure 6 is a partial I enlarged schematic view of the electric push rod according to an embodiment of the present application; Figure 10

[0040] Figure 13 Figure 7 is a partial II enlarged schematic view of the electric push rod according to an embodiment of the present application. Figure 11 DETAILED DESCRIPTION

[0041] The embodiments of the present application will be described in detail below with reference to the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions.

[0042] 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, and since the embodiments disclosed by the present application can be arranged in different directions, these terms indicating the direction are only as an illustration and should not be regarded as a limitation, such as "upper", "lower" do not necessarily be 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.

[0043] Referring to Figures 1-9 , an electric push rod can be used for a range hood to drive the movable parts of the range hood to overturn, lift, etc.

[0044] ​​The electric push rod comprises a motor 1, a housing 2, a screw rod 3, 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, 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.

[0045] The first telescopic tube 51 is located in the housing 2 when it is contracted and partially extends out of the housing 2 when it is expanded. The first telescopic tube 51 is sleeved on the moving nut 6 and can relatively move a limited distance along the axial direction of the screw rod 3. The moving nut 6 comprises a first part 61, a second part 62 and a third part 63 which are coaxially and sequentially formed 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 first telescopic tube 51 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 to threadedly cooperate 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 first telescopic tube 51 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 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 first spring 91 is arranged between the first part 61 of the moving nut 6 and the end of the first telescopic tube 51, so as to avoid relative movement of the two along the axial direction of the screw rod 3 in a normal state.

[0046] A limiting groove 512 is formed on the outer peripheral wall of the first telescopic tube 51, which can cooperate with the key groove of the housing 2 to limit the rotation of the first telescopic tube 51 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 first telescopic tube 51 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 first spring 91, so as to avoid the rotation of the moving nut 6.

[0047] The dustproof sealing cover 7 is arranged at the end of the shell 2 away from the motor 1, and the second telescopic tube 52 is sleeved with the first telescopic tube 51 at the end away from the moving nut 6, and the second telescopic tube 52 can be partially inserted into the first telescopic tube 51 at the end. When the first telescopic tube 51 is completely retracted 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 through the dustproof sealing cover 7. The electric push rod further comprises a second spring 92 abutting between the corresponding ends of the first telescopic tube 51 and the second telescopic tube 52, such as an annular flange can be arranged in (out) the end of each telescopic tube to realize abutting with the second spring 92, thereby avoiding the relative linear movement of the first telescopic tube 51 and the second telescopic tube 52 under normal circumstances, and only when an axial force is applied, the two can relatively linearly move.

[0048] The dustproof sealing cover 7 is arranged at the end of the shell 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, and the elastic clamp 72 is arranged on 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, and the inner ring spring sheet 722 is arranged in the outer ring spring sheet 721, which preferably has at least two sections, is arc-shaped, and is arranged in rotational symmetry. Under normal conditions, 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.

[0049] The first telescopic tube 51 is provided with a bevel deceleration assembly, which comprises a driving sleeve 41, a transmission member 42, a sliding block 43, a top block 44 and a coil spring 45. The transmission member 42 can rotate relative to the first telescopic tube 51 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 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, 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. 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 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 driving sleeve 41 and is threadedly connected therewith, whereby when the transmission member 42 is driven, the above-mentioned driving sleeve 41 can be driven to move linearly along the screw rod 3 in the axial direction.

[0050] The slider 43 passes through the top block 44, and is located in the driving sleeve 41, and is in a bevel connection with the driving sleeve 41, so that when the driving sleeve 41 moves axially along the screw rod 3, the slider 43 can be driven to move in a direction perpendicular to the screw rod 3.

[0051] As described above, the slider 43 passes through the top block 44, and is in a bevel connection with the top block 44, so that when the slider 43 moves, the top block 44 can be driven to move linearly along the axis of the screw rod 3. The top block 44 can abut against the corresponding end surface of the second telescopic pipe 52, so as to push the second telescopic pipe 52 outward.

[0052] The coil spring 45 can be arranged on the transmission disc 422 of the transmission member 42, and is used for resetting after the transmission member 42 rotates. The outer end of the coil spring 45 can be directly or indirectly fixed with the first telescopic pipe 51, and the inner end of the coil spring 45 can be fixed with the transmission member 42.

[0053] Referring to Figure 10 and Figure 12 When the electric push rod normally works, the motor 1 drives the first telescopic pipe 51 and the second telescopic pipe 52 to extend out of or retract into the housing 2, and the first telescopic pipe 51, the second telescopic pipe 52 and the moving nut 6 are relatively stationary. The dustproof sealing cover 7 will inevitably be brought into dust and oil during daily use, and the oil will accumulate into oil dirt. If the range hood is not used for a long time or in special circumstances, the second telescopic pipe 52 and the elastic clamp 72 will be adhered, and if the power of the motor is small, the second telescopic pipe 52 will be stuck and cannot be pushed out. At this time, the above structure can break the adhered state of the second telescopic pipe 52 and the dustproof sealing cover 7. Referring to Figure 11 and Figure 13, first telescopic pipe 51 and second telescopic pipe 52 after sticking, running motor 1, screw rod 3 drive mobile nut 6 forward (shown in the figure is to the right) a certain distance, because the first telescopic pipe 51 stuck will not be pushed by the first spring 91, the first spring 91 is gradually compressed, mobile nut 6 forward after engaging with transmission 42, mobile nut 6 and the first telescopic pipe 51 is no longer engaged, mobile nut 6 rotation limit release, screw rod 3 rotation drive mobile nut 6 rotation, in turn drive transmission 42 and drive sleeve 41 rotation, drive top block 44 right shift (shown in the figure orientation), the second telescopic pipe 52 top, thus break the second telescopic pipe 52 and dustproof seal cover 7 sticking state, while the second spring 92 stretch. Then reverse running motor 1, so that mobile nut 6 back to the initial position, again with the first telescopic pipe 51 engagement, and transmission 42 separate, the second telescopic pipe 52 thereafter can be reset under the action of the second spring 92, thus realize the stuck repair; Or can stop running motor 1, mobile nut 6 in the first spring 91 back to the initial position. Transmission 42 rotation process coil spring 45 power storage, until the stuck repair coil spring 45 release, drive transmission 42, drive sleeve 41, slider 43, top block 44 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 first telescopic tube (51) sleeved on the moving nut (6) and kept in a synchronized linear movement trend; 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 synchronized linear movement trend, and the second telescopic tube (52) penetrates out of the dustproof sealing cover (7); the electric push rod further comprises a bevel gear deceleration assembly provided in the first telescopic tube (51), the bevel gear deceleration assembly comprises a sliding block (43), a top block (44) and a driving sleeve (41) linearly movable along the axis of the screw rod (3), the sliding block (43) penetrates through the top block (44), and the sliding block (43) is bevelly engaged with the driving sleeve (41) and the top block (44) respectively; when the second telescopic tube (52) is stuck with the dustproof sealing cover (7), the moving nut (6) is linearly movable along the axis of the screw rod (3) relative to the first telescopic tube (51) so as to be engaged with the driving sleeve (41) to drive the driving sleeve (41) to move, and the top block (44) is driven by the sliding block (43) to push the second telescopic tube (52) outward.

2. The electric push rod for a range hood according to claim 1, characterized by: the sliding block (43) is located in the driving sleeve (41) and bevelly engaged with the driving sleeve (41), so that the sliding block (43) is driven by the driving sleeve (41) to move in a direction perpendicular to the screw rod (3) and to drive the top block (44) to linearly move along the axis of the screw rod (3).

3. The electric push rod for a range hood according to claim 1, characterized by: the top block (44) is abuttable against a corresponding end surface of the second telescopic tube (52) so as to push the second telescopic tube (52) outward.

4. The electric push rod for a range hood according to claim 1, characterized by: the first telescopic tube (51) is key-groove-engaged with the housing (2), and the moving nut (6) is kept in a synchronized linear movement trend only relative to the first telescopic tube (51).

5. The electric push rod for a range hood according to claim 4, characterized by: The mobile nut (6) comprises coaxially arranged first part (61), second part (62) and third part (63) in sequence, the outer diameter of the second part (62) is smaller than the first part (61) and the third part (63), the first telescopic tube (51) 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 first telescopic tube (51) 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 first telescopic tube (51).

6. The electric push rod for a range hood according to claim 5, characterized by: The end of the first telescopic tube (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 tube (51) inside the first telescopic tube (51), and a first spring (91) is arranged between the first part (61) of the mobile nut (6) and the end of the first telescopic tube (51), 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 bevel deceleration assembly further comprises a transmission member (42) arranged in the first telescopic tube (51), the transmission member (42) can rotate relative to the first telescopic tube (51) around the axis of the screw rod (3), 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, and the transmission member (42) is threadedly connected with the drive sleeve (41).

8. The electric push rod for a range hood according to claim 7, characterized by: The transmission member (42) further comprises a transmission disc (422) and a transmission rod (423), the fourth gear (421) is formed at one side of the transmission disc (422) towards the mobile nut (6), the transmission rod (423) is formed at the side of the transmission disc (422) away from the mobile nut (6), and the transmission rod (423) extends into the drive sleeve (41) and is threadedly connected therewith.

9. The electric push rod for a range hood according to claim 7, characterized by: The bevel deceleration assembly further comprises a coil spring (45), the outer end of the coil spring (45) is directly or indirectly fixed with the first telescopic tube (51), and the inner end of the coil spring (45) is connected with the transmission member (42).

10. The electric push rod for a range hood according to any one of claims 1 to 8, 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 ring 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).

11. A range hood comprising a movable component, characterized by: The electric push rod for a range hood according to any one of claims 1 to 10 is used to drive a movable component.

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