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 and the movable nut are located in the shell, the motor is connected to one end of the shell, and the telescopic pipe can only linearly move relative to the shell. The dustproof sealing cover is arranged at the end, away from the motor, of the shell, and at least part of the telescopic pipe extends out of the shell from the dustproof sealing cover; a transmission part is arranged in the telescopic pipe and is in threaded connection with the telescopic pipe, or the transmission part and a moving block are arranged in the telescopic pipe, the moving block is arranged in the transmission part and is in threaded connection with the transmission part, and when the telescopic pipe and the dustproof sealing cover are clamped, the moving nut can move in the axial direction of the lead screw relative to the telescopic pipe and rotate along with the lead screw. Therefore, the transmission part is driven to rotate, and the telescopic pipe is directly or indirectly jacked outwards through the transmission part.

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] 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] telescopic tube, sleeved on the moving nut and keeping the tendency of 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 telescopic tube being linearly movable relative to the housing only; and

[0013] dustproof sealing cover, provided at the end of the housing away from the motor, the telescopic tube being at least partially extended out of the housing from the dustproof sealing cover; characterized in that:

[0014] a transmission member is provided in the telescopic tube, the transmission member being threadedly connected with the telescopic tube, when the telescopic tube is stuck with the dustproof sealing cover, the moving nut is movable along the axis of the screw rod relative to the telescopic tube and rotates with the screw rod, so as to drive the transmission member to rotate, thereby pushing the telescopic tube out of the dustproof sealing cover; or a transmission member and a moving block are provided in the telescopic tube, the moving block being provided in the transmission member and threadedly connected with the transmission member, when the telescopic tube is stuck with the dustproof sealing cover, the moving nut is movable along the axis of the screw rod relative to the telescopic tube and rotates with the screw rod, so as to drive the transmission member to rotate, thereby pushing the telescopic tube out of the dustproof sealing cover through the moving block.

[0015] By providing the transmission member directly or indirectly cooperating with the telescopic tube, when the telescopic tube and the dustproof sealing cover are stuck, the moving nut and the transmission member are cooperated to make the transmission member directly or indirectly cooperate with the screw rod through the thread cooperation, the thrust of the motor is enlarged by the structure of multi-stage thread deceleration, so as to make the telescopic tube further move out of the housing, the stuck is automatically repaired, and after the stuck is repaired, the moving nut and the telescopic tube are automatically reset to the initial state without manual operation.

[0016] Further, the telescopic tube comprises:

[0017] first telescopic tube, sleeved on the moving nut and keeping the tendency of synchronous linear movement, the first telescopic tube being at least partially located in the housing and being linearly movable relative to the housing only; and

[0018] second telescopic tube, sleeved on the end of the first telescopic tube away from the moving nut, the first telescopic tube and the second telescopic tube keeping the tendency of synchronous linear movement, the second telescopic tube being extended out of the dustproof sealing cover;

[0019] the moving block cooperates with the second telescopic tube.

[0020] According to one aspect of the present application, the inner wall of the first telescopic tube is provided with a first thread near the second telescopic tube;

[0021] The transmission member comprises a second thread matched with the first thread and a third thread matched with the moving block, the third thread and the second thread have the same rotation direction, and the thread pitch of the third thread is greater than that of the second thread.

[0022] According to another aspect of the present application, the transmission member comprises a third thread matched with the moving block.

[0023] In order to facilitate the moving block to push the second telescopic tube, the second telescopic tube comprises a first tube, a second tube and a third tube arranged from inside to outside, the first tube protrudes from the second tube towards the end of the first telescopic tube, the second tube protrudes from the third tube towards the end of the first telescopic tube, the first tube has a first end face towards the end of the first telescopic tube, the second tube has a second end face towards the end of the first telescopic tube, the third tube has a third end face towards the end of the first telescopic tube, the end of the first telescopic tube abuts against the third end face, and the moving block abuts against the first end face of the second telescopic tube.

[0024] In order to avoid the rotation of the moving block, a limiting block is arranged on the second telescopic tube, the limiting block extends into the moving block so that the moving block can only move linearly.

[0025] Further, in order to ensure that the moving nut and the telescopic tube move linearly synchronously in a 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 that of the first 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, and the first gear and the second gear have a tendency to engage.

[0026] Further, in order to facilitate the moving nut to cooperate with the transmission member, 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, and the third gear and the fourth gear can engage and separate.

[0027] Further, in order to facilitate the transmission member to reset after being stuck, the electric push rod 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.

[0028] The utility model discloses a kind of electric push rods for range hood, including 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.

[0029] Compared with the prior art, the utility model has the advantages that by setting the transmission member directly or indirectly matched with the telescopic pipe, when the telescopic pipe and the dustproof sealing cover are stuck, the transmission member is directly or indirectly matched by the moving nut and the transmission member, the structure of multi-stage thread deceleration is used to enlarge the thrust of motor, so that the telescopic pipe is further moved out of the shell, the automatic repair of sticking is realized, and after the repair of sticking, the moving nut and the telescopic pipe are automatically reset to the initial state, without manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the schematic diagram of electric push rod of the first embodiment of the utility model;

[0031] Figure 2 It is the sectional view of electric push rod of the first embodiment of the utility model;

[0032] Figure 3 It is the schematic diagram of hidden casing of electric push rod of the first embodiment of the utility model;

[0033] Figure 4 It is the exploded structural schematic diagram of Figure 3 ;

[0034] Figure 5 It is the schematic diagram of moving nut of electric push rod of the first embodiment of the utility model;

[0035] Figure 6 It is the sectional view of first telescopic pipe of electric push rod of the first embodiment of the utility model;

[0036] Figure 7 It is the schematic diagram of elastic clamp of electric push rod of the first embodiment of the utility model;

[0037] Figure 8 It is the schematic diagram of second telescopic pipe of electric push rod of the first embodiment of the utility model;

[0038] Figure 9 It is the sectional view of second telescopic pipe of electric push rod of the first embodiment of the utility model;

[0039] Figure 10 It is the exploded structural schematic diagram of moving block, transmission member and coil spring of electric push rod of the first embodiment of the utility model;

[0040] Figure 11The utility model discloses a sectional view main view (normal state) of electric push rod of first embodiment of the utility model;

[0041] Figure 12 The utility model discloses a sectional view main view (repair state) of electric push rod of first embodiment of the utility model;

[0042] Figure 13 For Figure 11 The local I enlarged diagram of schematic diagram;

[0043] Figure 14 For Figure 12 The local II enlarged diagram of schematic diagram;

[0044] Figure 15 The utility model discloses a sectional view main view (normal state) of electric push rod of second embodiment of the utility model;

[0045] Figure 16 The utility model discloses a sectional view main view (repair state) of electric push rod of second embodiment of the utility model;

[0046] Figure 17 For the schematic diagram of telescopic pipe of electric push rod of second embodiment of the utility model;

[0047] Figure 18 The utility model discloses a sectional view main view (normal state) of electric push rod of third embodiment of the utility model;

[0048] Figure 19 The utility model discloses a sectional view main view (repair state) of electric push rod of third embodiment of the utility model;

[0049] Figure 20 For Figure 18 The local III enlarged diagram of schematic diagram. Specific implementation

[0050] The embodiment of the utility model is described in detail below, and the example of the embodiment is shown in the drawings, wherein same or similar signs represent same or similar elements or elements with same or similar functions.

[0051] In the description of the utility model, need understanding is, the term "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" "internal", "external", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and so on the orientation or positional relationship indicated for the orientation or positional relationship shown in the drawing, just for the convenience of describing the utility model and simplifying the description, and not indicate or imply the device or element indicated must have a particular orientation, with a particular orientation configuration and operation, because the embodiment disclosed by the utility model can be set up according to different directions, so these direction indicating terms are just as illustration and should not be regarded as limitation, such as "upper", "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity.This in addition, the feature defined with "first", "second" can be explicitly or implicitly include one or more features.

[0052] Embodiment one

[0053] Reference Figures 1-10 An electric push rod can be used for a range hood to drive the movable parts of the range hood to overturn, lift and the like.

[0054] The electric push rod comprises a motor 1, a shell 2, a screw rod 3, a moving block 41, a transmission member 42, a coil spring 43, a first telescopic pipe 51, a second telescopic pipe 52, a moving nut 6 and a dustproof sealing cover 7.The motor 1 is connected to one end of the shell 2, and its output end extends into the shell 2, the motor 1 drives 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 is threadedly matched 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 shell 2.

[0055] The first telescopic tube 51 is located in the shell 2 when contracted and partially extends out of the shell 2 when extended, and is sleeved on the moving nut 6, both of which can relatively move along the axial direction of the screw rod 3 for a limited distance. The moving nut 6 comprises a first portion 61, a second portion 62 and a third portion 63 which are coaxially arranged in sequence and integrally formed, the outer diameter of the second portion 62 is smaller than that of the first portion 61 and the third portion 63, and the first telescopic tube 51 is sleeved on the outer periphery of the second portion 62 and the third portion 63. The first portion 61 and the second portion 62 are used for threadedly cooperating with the screw rod 3, and the third portion 63 can be arranged radially spaced apart from the screw rod 3. The end of the first telescopic tube 51 located in the shell 2 is formed with a first annular flange 511 which protrudes radially inward, and the end of the third portion 63 adjacent to the second portion 62 can abut against the first 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 portion 61 of the moving nut 6 and the end of the first telescopic tube 51, for avoiding relative movement of both along the axial direction of the screw rod 3 in normal state.

[0056] A limiting groove 512 is formed on the outer peripheral wall of the first telescopic tube 51, and can be matched with the key groove of the shell 2, so as to limit the rotation of the first telescopic tube 51 relative to the shell 2. The end of the third portion 63 of the moving nut 6 adjacent to the second portion 62 is provided with a first gear 64, and the first annular flange 511 of the first telescopic tube 51 is provided with a second gear 513, and in 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.

[0057] The dustproof sealing cover 7 is arranged at the end of the shell 2 away from the motor 1, the end of the first telescopic tube 51 away from the moving nut 6 is sleeved with a second telescopic tube 52, and 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 contracted in the shell 2, the end close to the dustproof sealing cover 7, and the second telescopic tube 52 extends out of the dustproof sealing cover 7 by penetrating through the dustproof sealing cover 7. The electric push rod further comprises a second spring 92 which abuts between the corresponding ends of the first telescopic tube 51 and the second telescopic tube 52, such as annular flanges arranged inside (outside) the ends of the telescopic tubes to achieve abutment with the second spring 92, so as to avoid the relative linear movement of the first telescopic tube 51 and the second telescopic tube 52 in normal condition, and only when an axial force is applied, the two can relatively linearly move.

[0058] The second telescopic pipe 52 comprises a first pipe 521, a second pipe 522 and a third pipe 523 arranged from inside to outside, the first pipe 521 protrudes from the second pipe 522 towards the end of the first telescopic pipe 51, and the second pipe 522 protrudes from the third pipe 523 towards the end of the first telescopic pipe 51. The first pipe 521 has a first end face 5211 towards the end of the first telescopic pipe 51, the second pipe 522 has a second end face 5221 towards the end of the first telescopic pipe 51, and the third pipe 523 has a third end face 5231 towards the end of the first telescopic pipe 51. The end of the first telescopic pipe 51 abuts against the third end face 5231. The inner wall of the first telescopic pipe 51 is provided with a first thread 514 near the second telescopic pipe 52.

[0059] The transmission member 42 is partially arranged in the first telescopic pipe 51, and can rotate relative to the first telescopic pipe 51 around the axis of the lead screw 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, 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 disengaged.

[0060] The moving block 41 is arranged in the transmission member 42, and abuts against the first end face 5211 of the second telescopic pipe 52. A limiting block 5212 can be arranged on the first pipe 521 and extends into the interior of the moving block 41 to limit the rotation of the moving block 41. The limiting block 5212 can be designed in a hexagonal structure to prevent the rotation of the moving block 41.

[0061] The transmission member 42 comprises a head 422, a neck 423 and a tail 424 arranged coaxially in sequence. The outer diameter of the neck 423 is smaller than that of the head 422 and the tail 424, and the tail 423 can be a hollow structure. The head 422 is open at one end thereof towards the moving nut 6, and the tail 424 is open at one end thereof towards the second telescopic pipe 52. The moving block 41 is arranged in the tail 424, and the fourth gear 421 is formed at the end of the head 422 towards the moving nut 6.

[0062] The tail 424 is provided with a second thread 4241 on the outer periphery thereof, and a third thread 4242 on the inner periphery thereof. The inner periphery of the tail 424 is threadedly connected with the moving block 41 through the third thread 4242, and the second thread 4241 can be threadedly connected with the first thread 514 of the first telescopic pipe 51.

[0063] The third thread 4242 and the second thread 4241 have the same direction of rotation, and the thread pitch of the third thread 4242 is greater than that of the second thread 4241. This design can make the moving block 41 move rightwards when the transmission member 42 rotates leftwards (left and right are relative to the direction of the arrow A).Figure 11 When the moving block 41 moves to the right (in the direction shown in the figure), the right moving speed is greater than the left moving speed, and the moving block 41 moves to the right relative to the shell 2.

[0064] The coil spring 43 is arranged on the outer periphery of the neck portion 423, and is used for resetting after the transmission member 42 rotates. The outer end of the coil spring 43 can be fixed to the first telescopic tube 51 directly or indirectly, and the inner end of the coil spring 43 can be fixed to the transmission member 42.

[0065] The dustproof cover 7 is arranged on the end of the shell 2 away from the motor 1, and the dustproof 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 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 and has at least two sections, is arc-shaped, and 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 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.

[0066] Referring to Figure 11 and Figure 13 When the electric push rod normally works, the motor 1 drives the first telescopic tube 51 and the second telescopic tube 52 to extend out of or retract into the shell 2, and the first telescopic tube 51, the second telescopic tube 52 and the moving nut 6 are relatively static. During daily use, the dustproof cover 7 will inevitably be brought into dust and oil and accumulate into oil dirt by the first telescopic tube 51 and the second telescopic tube 52. If the range hood is not used for a long time or in special circumstances, the second telescopic tube 52 and the elastic clamp 72 will be adhered, and if the motor power is small, the second telescopic tube 52 will be stuck and cannot be pushed out. At this time, the above structure can break the adhered state of the second telescopic tube 52 and the dustproof cover 7. Referring to Figure 12 and Figure 14, the first telescopic tube 51 and the second telescopic tube 52 are stuck, the motor 1 is operated, the screw rod 3 drives the moving nut 6 to advance (shown as right in the figure) a certain distance, the first telescopic tube 51 cannot be pushed by the first spring 91 because it is stuck, the first spring 91 is gradually compressed, the moving nut 6 is engaged with the transmission member 42 after moving forward, the moving nut 6 and the first telescopic tube 51 are no longer engaged, the rotation limit of the moving nut 6 is removed, the screw rod 3 drives the moving nut 6 to rotate, and then drives the transmission member 42 to rotate and retreat (shown as left in the figure), so as to drive the moving block 41 to move right, and the second telescopic tube 52 is kicked, thereby breaking the sticking state of the second telescopic tube 52 and the dustproof sealing cover 7, and the second spring 92 is stretched. Then the motor 1 is operated in reverse, so that the moving nut 6 retreats to the initial position, and is engaged with the first telescopic tube 51 again and separated from the transmission member 42, so as to realize 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 first spring 91. The coil spring 43 is energized during the rotation of the transmission member 42, and is released after the repair of the sticking, so as to drive the transmission member 42 and the second telescopic tube 52 to reset.

[0067] Embodiment Two

[0068] Referring to Figures 15-17 In this embodiment, the difference from the above-mentioned embodiment one is that the first telescopic tube 51 and the second telescopic tube 52 are integrally formed single pipe, which constitutes the telescopic tube, instead of two separated pipes. The transmission member 42 is arranged in the telescopic tube, the second annular flange 515 is arranged on the inner wall of the telescopic tube adjacent to the first screw thread 514, the second screw thread 4241 on the tail portion 424 of the transmission member 42 cooperates with the first screw thread 514, and the end face of the tail portion 424 away from the head portion 422 abuts against the second annular flange 515, so as to limit the position of the transmission member 42. In addition, the third screw thread 4242 and the moving block 41 are no longer arranged.

[0069] Referring to Figure 15 When the electric push rod normally works, the motor 1 drives the telescopic tube to extend out of the shell 2 or retract, and the telescopic tube and the moving nut 6 are relatively static. The dustproof sealing cover 7 is inevitably brought into dust and oil during daily use, and the oil is accumulated into oil stains, the second telescopic tube 52 and the elastic clamp 72 are stuck under special conditions such as the range hood is not used for a long time, and the second telescopic tube 52 cannot be pushed out if the power of the motor is small. At this time, the sticking state of the second telescopic tube 52 and the dustproof sealing cover 7 can be broken by using the above-mentioned structure. Referring to Figure 16, the telescopic tube is stuck, the motor 1 is operated, the lead screw 3 drives the moving nut 6 to move forward (shown as right in the figure) for a certain distance, the telescopic tube cannot be pushed by the first spring 91 due to the telescopic tube being stuck, the first spring 91 is gradually compressed, the moving nut 6 is engaged with the transmission member 42 after moving forward, the moving nut 6 is no longer engaged with the telescopic tube, the rotation limit of the moving nut 6 is released, the lead screw 3 drives the moving nut 6 to rotate, and then drives the transmission member 42 to rotate, through the matching structure of the second thread 4241 and the first thread 514, the telescopic tube moves right (shown as the orientation in the figure), thereby destroying the bonding state of the telescopic tube and the dustproof sealing cover 7, and then the motor 1 is operated in reverse to make the moving nut 6 retreat to the initial position and be engaged with the telescopic tube again while being separated from the transmission member 42, so that the stuck repair is realized; or the motor 1 can also be stopped, and the moving nut 6 retreats to the initial position under the action of the first spring 91. The coil spring 43 is energized during the rotation of the transmission member 42, and is released after the stuck repair to drive the transmission member 42 and the telescopic tube to reset.

[0070] Embodiment Three

[0071] Referring to Figures 18-20 In the embodiment, the difference from the above-mentioned embodiment one is that the electric push rod further comprises a second spring 92, which is sleeved on the outer periphery of the first pipe 521 and the second pipe 522 of the second telescopic tube 52, and the two ends are respectively in abutment with the end of the first telescopic tube 51 (such as the annular convex edge arranged on the inner periphery) and the third end surface 5231 of the third pipe 523.

[0072] In addition, the first telescopic tube 51 and the transmission member 42 are no longer provided with the first thread 514 and the second thread 4241, respectively.

[0073] Referring to Figure 18 When the electric push rod is normally working, the motor 1 drives the first telescopic tube 51 and the second telescopic tube 52 to extend out of or retract into the housing 2, and the first telescopic tube 51, the second telescopic tube 52 and the moving nut 6 are relatively stationary. The dustproof sealing cover 7 will inevitably be brought into dust and oil accumulation into oil stains during daily use, and if the range hood is not used for a long time or in special circumstances, the second telescopic tube 52 and the elastic clamp 72 will be stuck, and if the motor power is small, the second telescopic tube 52 will be stuck and cannot be pushed out. At this time, the above-mentioned structure can destroy the bonding state of the second telescopic tube 52 and the dustproof sealing cover 7. Referring to Figure 19, first telescopic pipe 51 and second telescopic pipe 52 are bonded and stuck, running motor 1, screw rod 3 drives moving nut 6 to advance (shown as right in the figure) a certain distance, since first telescopic pipe 51 is stuck and cannot be pushed by first spring 91, first spring 91 is gradually compressed, after moving nut 6 moves forward and engages with transmission part 42, moving nut 6 and first telescopic pipe 51 are no longer engaged, the rotation limit of moving nut 6 is removed, screw rod 3 rotates to drive moving nut 6 to rotate, further drives transmission part 42 to rotate, drives moving block 41 to move right, second telescopic pipe 52 is kicked, second spring 92 is elongated, thus destroying the bonded state of second telescopic pipe 52 and dustproof sealing cover 7, then reverse running motor 1, so that moving nut 6 retreats to the initial position, again engages with first telescopic pipe 51, and is separated from transmission part 42, achieving stuck repair; or the running motor 1 can also be stopped, moving nut 6 retreats to the initial position under the action of first spring 91. During the rotation of transmission part 42, coil spring 43 stores energy, after stuck repair, coil spring 43 is released, drives transmission part 42 and moving block 41 to reset, second spring 92 makes second telescopic pipe 52 reset.

Claims

1. An electric push rod for an extractor 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 sleeved on the moving nut (6) and keeping a tendency of synchronous linear movement; a housing (2) in which the screw rod (3) and the moving nut (6) are located, the motor (1) being connected to one end of the housing (2), the telescopic tube 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), the telescopic tube being at least partially extended out of the housing (2) from the dustproof sealing cover (7); characterized in that: a transmission member (42) is arranged in the telescopic tube, the transmission member (42) being threadedly connected with the telescopic tube, when the telescopic tube is stuck with the dustproof sealing cover (7), the moving nut (6) is movable along the axial direction of the screw rod (3) relative to the telescopic tube and rotates with the screw rod (3), thereby driving the transmission member (42) to rotate, so as to push the telescopic tube out of the dustproof sealing cover (7); or a transmission member (42) and a moving block (41) are arranged in the telescopic tube, the moving block (41) being arranged in the transmission member (42) and threadedly connected with the transmission member (42), when the telescopic tube is stuck with the dustproof sealing cover (7), the moving nut (6) is movable along the axial direction of the screw rod (3) relative to the telescopic tube and rotates with the screw rod (3), thereby driving the transmission member (42) to rotate, so as to push the telescopic tube out of the dustproof sealing cover (7) through the moving block (41). The telescopic tube comprises:

2. The electric push rod for a range hood according to claim 1, characterized by: a first telescopic tube (51) sleeved on the moving nut (6) and keeping a tendency of synchronous linear movement, 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 second telescopic tube (52) sleeved on an end of the first telescopic tube (51) away from the moving nut (6), the first telescopic tube (51) and the second telescopic tube (52) keeping a tendency of synchronous linear movement, the second telescopic tube (52) being extended out of the dustproof sealing cover (7); the moving block (41) being engaged with the second telescopic tube (52). An inner wall of the first telescopic tube (51) is provided with a first thread (514) near the second telescopic tube (52); 3. The electric push rod for a range hood according to claim 2, characterized by: the transmission member (42) comprises a second thread (4241) engaged with the first thread (514) and a third thread (4242) engaged with the moving block (41), the third thread (4242) and the second thread (4241) having the same hand, the third thread (4242) having a thread pitch greater than that of the second thread (4241). The transmission member (42) comprises the third thread (4242) engaged with the moving block (41).

4. The electric push rod for a range hood according to claim 2, characterized by: ​ 5. The electric push rod for a range hood according to any one of claims 2 to 4, characterized by: The second telescopic tube (52) comprises a first tube (521), a second tube (522) and a third tube (523) arranged from inside to outside, the first tube (521) protrudes from the second tube (522) towards the end of the first telescopic tube (51), the second tube (522) protrudes from the third tube (523) towards the end of the first telescopic tube (51), the first tube (521) has a first end face (5211) towards the end of the first telescopic tube (51), the second tube (522) has a second end face (5221) towards the end of the first telescopic tube (51), the third tube (523) has a third end face (5231) towards the end of the first telescopic tube (51), the end of the first telescopic tube (51) abuts against the third end face (5231), and the moving block (41) abuts against the first end face (5211) of the second telescopic tube (52).

6. The electric push rod for a range hood according to any one of claims 2 to 4, characterized by: A limiting block (5212) is arranged on the second telescopic tube (52) and extends into the moving block (41) so that the moving block (41) can only move linearly.

7. The electric push rod for a range hood according to claim 1, characterized by: The moving 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 that of the first part (61) and the third part (63), 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), the end of the telescopic tube located in the shell (2) is provided with a second gear (513), and the first gear (64) and the second gear (513) have a tendency to engage.

8. The electric push rod for a range hood according to claim 7, characterized by: The transmission member (42) is arranged adjacent to the third part (63) of the moving 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 moving nut (6) away from the second part (62) is provided with a third gear (65), the transmission member (42) comprises a fourth gear (111) arranged at one end thereof towards the moving nut (6), and the third gear (65) and the fourth gear (111) can engage and disengage.

9. The electric push rod for a range hood according to any one of claims 1 to 4, characterized by: The electric push rod further comprises a coil spring (43), the outer end of the coil spring (43) is directly or indirectly fixed with the telescopic tube, and the inner end of the coil spring (43) is connected with the transmission member (42).

10. A range hood comprising a movable component, characterized in that: The electric push rod for driving a movable component of a range hood is applied.

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