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, and the electric push rod for the range hood comprises a motor; the screw rod is driven by the motor; the movable nut is arranged on the lead screw in a sleeving manner and is in threaded fit with the lead screw; the 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; the electric push rod further comprises an ejector rod abutting against or connected with the movable nut, a rod piece and a rotating block, the ejector rod is arranged in the telescopic pipe, the rotating block is rotationally connected with the pipe wall of the telescopic pipe, and 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. And therefore, the rotating block rotates relative to the telescopic pipe by ejecting the rod piece through the ejector rod, so that the rotating block protrudes out of the peripheral wall of the telescopic pipe outwards, and the telescopic pipe and the dustproof sealing cover are ejected open.

Description

TECHNICAL FIELD

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

[0002] Range hood has become the necessary household appliance in resident kitchen. With the continuous progress of technology, the function of range hood is more and more diversified. For example, the commonly used side suction type range hood is provided with a reversible smoke baffle, and the opening and closing of the smoke baffle is driven by an electric push rod. For example, please refer to 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 conforming to individual use habits and improving the comfort of use. For example, please refer to 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, so as to drive 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, and if the motor power is small, the telescopic tube will be stuck and unable to be pushed out.

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

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

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

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

[0008] motor;

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

[0010] a moving nut sleeved on the screw rod and threadedly engaged with the screw rod so as to be 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 the motor is connected to one end of the housing; and

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

[0014] the electric push rod further comprises a top rod abutting against or connected to the moving nut, a rod member arranged at the end of the top rod away from the moving nut, and a rotating block matched with the rod member, the top rod is arranged in the telescopic tube, the rotating block is rotationally connected to the wall of the telescopic tube, when the telescopic tube is stuck with the dustproof sealing cover, the moving nut can move along the axial direction of the screw rod relative to the telescopic tube, so as to push the rod member through the top rod and make the rotating block rotate relative to the telescopic tube, and the rotating block protrudes outward from the peripheral wall of the telescopic tube, thereby pushing the telescopic tube and the dustproof sealing cover apart.

[0015] by arranging the rotating block capable of rotating relative to the telescopic tube, and making the moving nut and the telescopic tube have a certain axial relative movement, when the telescopic tube is stuck with the dustproof sealing cover and cannot move axially, the rotating block is pushed by the movement of the moving nut and the top rod to protrude outward relative to the telescopic tube, thereby pushing the dustproof sealing cover apart, realizing automatic repair of the sticking, and after the repair of the sticking, the telescopic tube is automatically reset to the initial state under the action of the spring and moves synchronously with the moving nut, without manual operation.

[0016] Preferably, a through groove is arranged on the wall of the telescopic tube;

[0017] the rod member comprises a main rod, a first flange and a second flange formed on the main rod, the first flange and the second flange are coaxially and spacedly arranged, the rotating block is in T shape, the head of the rotating block is located in the through groove and rotationally connected to the telescopic tube, the tail of the rotating block is clamped between the first flange and the second flange, and when the rotating block is not pushed by the top rod, the surface of the head facing the outside of the telescopic tube is flush with the peripheral wall of the telescopic tube.

[0018] The rotating block is in T-shaped structure and rotates around the head, and the rotating arm is long, so that the horizontal pushing force can be converted into a larger outward expanding pushing force.

[0019] Preferably, in order to facilitate the rotating connection of the rotating block and the telescopic pipe and make the rotating arm long enough, a convex is arranged on the side of the head of the rotating block, and a groove matched with the convex is arranged on the inner wall of the telescopic pipe, so that the rotating block and the telescopic pipe are rotatably connected.

[0020] Further, in order to facilitate the synchronous movement of the moving nut and the telescopic pipe in the normal state, generate relative movement when the telescopic pipe is stuck, and avoid separation during the relative movement, the moving nut comprises a first part and a second part arranged coaxially, the outer diameter of the second part is smaller than that of the first part, the telescopic pipe is sleeved on the outer periphery of the second part, the moving nut further comprises a first annular flange formed on the end of the second part away from the first part, the first annular flange protrudes radially outward, the end of the telescopic pipe located in the shell is provided with a second annular flange protruding radially inward, and a first spring is arranged between the first part of the moving nut and the end of the telescopic pipe, so that the first annular flange abuts against the second annular flange of the telescopic pipe in the interior of the telescopic pipe, thereby keeping the tendency of synchronous movement of the moving nut and the telescopic pipe.

[0021] Preferably, in order to facilitate the dustproof sealing cover to clamp the telescopic pipe to play a dustproof sealing role and be easily pried open by the rotating block, the dustproof sealing cover comprises a cover body and an elastic clamp arranged in the cover body, the elastic clamp is arranged on the outer periphery of the telescopic pipe, the elastic clamp comprises an outer ring spring piece and an inner ring spring piece, the outer ring spring piece is in wavy annular shape, the inner ring spring piece is arranged in the outer ring spring piece, the inner ring spring piece has at least two arc-shaped sections, and the outer ring spring piece abuts against the cover body to press the inner ring spring piece inward to clamp the outer peripheral wall of the telescopic pipe.

[0022] The number and position of the inner ring spring piece correspond to the rotating block respectively.

[0023] Further, in order to avoid the rotation of the moving nut, the moving nut and the shell key groove are matched.

[0024] In order to facilitate the resetting of the rotating block, a second spring is arranged between the rotating block and the jacking rod.

[0025] The technical solution adopted by the utility model to solve the second technical problem is: a range hood, comprising a movable component, characterized in that: an electric push rod for range hood is applied to drive the movable component.

[0026] Compared with the prior art, the electric push rod has the advantages that the rotating block can be pushed outwards and expanded to protrude the telescopic pipe by the moving nut and the moving of the top rod, when the telescopic pipe is stuck by the dustproof sealing cover and cannot move axially, thereby the dustproof sealing cover can be pried open, the automatic repair of the sticking is realized, and after the repair of the sticking, the telescopic pipe is automatically reset to the initial state under the action of the spring, moves synchronously with the moving nut, and manual operation is not needed. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

[0030] Figure 4 is an exploded structural schematic view of Figure 3 ;

[0031] Figure 5 is a cooperation schematic view of the rod member and the rotating block of the electric push rod of the utility model embodiment;

[0032] Figure 6 is an exploded structural schematic view of the rod member and the rotating block of the electric push rod of the utility model embodiment;

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

[0034] Figure 8 is a schematic view of the moving nut of the electric push rod of the utility model embodiment;

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

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

[0037] Figure 11 is a partial I enlarged schematic view of Figure 9 ;

[0038] Figure 12 is a partial II enlarged schematic view of Figure 10 . DETAILED DESCRIPTION

[0039] 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.

[0040] 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 by the present application can be arranged in different directions, so these terms indicating the direction 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.

[0041] 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.

[0042] The electric push rod comprises a motor 1, a housing 2, a lead screw 3, a top rod 4, an extension tube 5, a moving nut 6 and a dustproof sealing cover 7. The motor 1 is connected to one end of the housing 2, and its output end extends into the housing 2, and through the meshing worm wheel 81 and worm 82, the lead screw 3 can be driven to rotate around its own axis. 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 lead screw 3 and rotates synchronously with the lead screw 3. The moving nut 6 is sleeved on the outer periphery of the lead screw 3 and threadedly cooperates with the lead screw 3, so that when the lead screw 3 rotates, the moving nut 6 can move linearly along the lead screw 3. The worm wheel 81, the worm 82, the lead screw 3 and the moving nut 6 are all arranged in the housing 2. The moving nut 6 can cooperate with the key groove of the housing 2, so as to prevent the moving nut 6 from rotating.

[0043] The telescopic tube 5 is partially located in the housing 2 and is sleeved on the moving nut 6, and the two can move relative to each other along the axial direction of the screw rod 3 within a limited distance. The moving nut 6 comprises a first part 61 and a second part 62 which are coaxially arranged and integrally formed, and the outer diameter of the second part 62 is smaller than that of the first part 61, and the telescopic tube 5 is sleeved on the outer periphery of the second part 62. The moving nut 6 further comprises a first annular flange 63 formed at the end of the second part 62 away from the first part 61, and the first annular flange 63 protrudes radially outward. The end of the telescopic tube 5 located in the housing 2 is formed with a second annular flange 51 which protrudes radially inward, and the first annular flange 63 can abut against the second annular flange 51 of the telescopic tube 5 in the interior of the telescopic tube 5, thereby preventing the moving nut 6 and the telescopic tube 5 from being separated. A first spring 91 is arranged between the first part 61 of the moving nut 6 and the end of the telescopic tube 5, for avoiding axial relative movement of the two in a normal state, i.e., the two annular flanges are in close contact in the normal state. The telescopic tube 5 is used for connecting the load of the electric push rod.

[0044] A dustproof sealing cover 7 is arranged at the end of the housing 2 away from the motor 1, and the telescopic tube 5 penetrates out of the dustproof sealing cover 7. 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 a through slot 52 is formed on the wall of the telescopic tube 5, the position of the through slot 52 corresponds to the dustproof sealing cover 7 when the telescopic tube 5 is contracted to the limit position in the housing 2. 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 which are arranged in rotational symmetry and are in arc shape. In a normal state, the outer ring spring sheet 721 abuts against the cover body 71, and the inner ring spring sheet 722 is pressed inward to clamp the outer peripheral wall of the telescopic tube 5, for limiting the telescopic tube 5 to avoid shaking and avoiding impurities being brought into the housing 2 by the telescopic tube 5.

[0045] The top rod 4 is arranged in the telescopic tube 5 and is arranged at intervals on the outer periphery of the screw rod 3. One end of the top rod 4 is in abutment or connected with the moving nut 6. The electric push rod further comprises a rotating block 11 and a rod 12, the rod 12 comprises a main rod 121, a first flange 122 and a second flange 123 formed on the main rod 121, the main rod 121 is connected at the end of the top rod 4 away from the moving nut 6 and can be coaxially arranged with the screw rod 3. The first flange 122 and the second flange 123 are coaxially arranged at intervals, the first flange 122 is closer to the top rod 4 than the second flange 123, and the main rod 121, the first flange 122 and the second flange 123 cooperatively form a structure similar to an H-shaped rod. The rotating block 11 is T-shaped, the head 111 (corresponding to the horizontal of the "T") of the rotating block 11 is located in the through slot 52, and the tail 112 (corresponding to the vertical of the "T") of the rotating block 11 is preferably cylindrical and is clamped between the first flange 122 and the second flange 123. The side surface of the head 111 of the rotating block 11 is provided with a convex 113, and a groove matched with the convex 113 can be arranged on the inner side of the wall of the telescopic tube 5, so that the rotating block 11 and the telescopic tube 5 are rotationally connected and can only rotate around the axis of the convex 113. The axis of the convex 113 is perpendicular to the axis of the screw rod 3. In the normal state, the surface of the head 111 of the rotating block 11 facing the outside of the telescopic tube 5 is flush with the outer peripheral wall of the telescopic tube 5.

[0046] Since the rotating block 11 is T-shaped and can rotate around the axis of the convex 113, the rotating force arm is long, and it is a force-saving lever structure, which can convert horizontal thrust into larger outward expansion thrust. The number and position of the rotating block 11 are preferably corresponding to the inner ring spring sheet 722, so as to push open the corresponding inner ring spring sheet 722.

[0047] When the top rod 4 is pushed by the moving nut 6, it can push the tail 112 of the rotating block 11 through the rod 12, so that the rotating block 11 rotates relative to the telescopic tube 5, thereby expanding outwardly and protruding from the outer peripheral wall of the telescopic tube 5. A second spring 92 is arranged between the rotating block 11 and the top rod 4, for resetting the rotating block 11.

[0048] Referring to Figure 9 and Figure 11 , when the electric push rod is normally working, the motor 1 drives the telescopic tube 5 to extend out of or retract into the housing 2, and the telescopic tube 5 and the moving nut 6 are relatively stationary. The dustproof sealing cover 7 will inevitably accumulate dust and oil into oil stains during daily use. If the telescopic tube and the elastic clamp 72 are adhered under special circumstances such as the range hood is not used for a long time, and if the motor power is small, the telescopic tube 5 may be stuck and cannot be pushed out. At this time, the above structure can break the adhesion state of the telescopic tube 5 and the elastic clamp 72. That is, after the telescopic tube 5 is stuck and stuck, the motor 1 is operated, referring to Figure 10 and Figure 12, the screw rod 3 drives the moving nut 6 to advance (shown as right in the figure) a certain distance, since the telescopic tube 5 is stuck and cannot be pushed by the first spring 91, the first spring 91 is gradually compressed, the moving nut 6 moves forward to push the top rod 4 to move, the rod 12 moves to push the rotating block 11 to rotate, since the T-shaped lever structure of the rotating block 11, the pushing force is amplified into outward expanding pushing force, the rotating block 11 expands outward to protrude from the outer circumferential wall of the telescopic tube 5, thereby opening the inner ring spring sheet 722 of the elastic clamp 72, breaking the adhesion state of the telescopic tube 5 and the elastic clamp 72, and then reversing the motor 1 to make the moving nut 6 retreat to the initial position, since the top rod 4 is separated from the moving nut 6 (if the two are connected, the top rod 4 is driven to reset by the moving nut 6), the top rod 4 is no longer subjected to force, the rotating block 11 and the top rod 4 reset under the action of the second spring 92 to recover to Figure 9 the stuck repair is realized.

Claims

1. An electric push rod for a range hood, comprising: Motor (1); The lead screw (3) is driven by the motor (1) to rotate around its own axis; The movable nut (6) is sleeved on the lead screw (3) and threaded with the lead screw (3), so that it can move linearly along the lead screw (3); The telescopic tube (5) is fitted onto the movable nut (6) and maintains a tendency to move synchronously in a straight line; The housing (2), the lead screw (3), the movable nut (6), and at least part of the telescopic tube (5) are located inside the housing (2), and the motor (1) is connected to one end of the housing (2); and A dustproof sealing cover (7) is provided at the end of the outer casing (2) away from the motor (1), and the telescopic tube (5) extends from the dustproof sealing cover (7) to the outside of the outer casing (2); characterized in that: The electric push rod also includes a push rod (4) that abuts against or connects to the movable nut (6), a rod (12) located at the end of the push rod (4) away from the movable nut (6), and a rotating block (11) that cooperates with the rod (12). The push rod (4) is located inside the telescopic tube (5), and the rotating block (11) is rotatably connected to the wall of the telescopic tube (5). When the telescopic tube (5) is jammed with the dustproof sealing cover (7), the movable nut (6) can move relative to the telescopic tube (5) along the axial direction of the screw (3), thereby causing the rod (12) to be pushed by the push rod (4) so ​​that the rotating block (11) rotates relative to the telescopic tube (5), thereby causing the rotating block (11) to protrude outward from the outer peripheral wall of the telescopic tube (5) and push open the telescopic tube (5) and the dustproof sealing cover (7).

2. The electric push rod for a range hood according to claim 1, characterized in that: The telescopic pipe (5) has a through groove (52) on its wall; The rod (12) includes a main rod (121), a first flange (122) and a second flange (123) formed on the main rod (121). The first flange (122) and the second flange (123) are arranged coaxially and spaced apart. The rotating block (11) is T-shaped. The head (111) of the rotating block (11) is located in the through groove (52) and is rotatably connected to the telescopic tube (5). The tail (112) of the rotating block (11) is stuck between the first flange (122) and the second flange (123). When the rotating block (11) is not pushed by the top rod (4), the surface of the head (111) facing the outside of the telescopic tube (5) is flush with the outer peripheral wall of the telescopic tube (5).

3. The electric push rod for a range hood according to claim 2, characterized in that: The rotating block (11) has a protrusion (113) on the side of its head (111), and the telescopic tube (5) has a groove on the inner side of its wall that cooperates with the protrusion (113), so that the rotating block (11) and the telescopic tube (5) are rotatably connected.

4. The electric push rod for a range hood according to any one of claims 1 to 3, characterized in that: The movable nut (6) includes a first part (61) and a second part (62) arranged coaxially. The outer diameter of the second part (62) is smaller than that of the first part (61). The telescopic tube (5) is sleeved on the outer periphery of the second part (62). The movable nut (6) also includes a first annular protrusion (63) formed at the end of the second part (62) away from the first part (61). The first annular protrusion (63) protrudes radially outward. The end of the telescopic tube (5) located inside the outer shell (2) has a second annular protrusion (51) protruding radially inward. A first spring (91) is provided between the first part (61) of the movable nut (6) and the end of the telescopic tube (5), so that the first annular protrusion (63) abuts against the second annular protrusion (51) of the telescopic tube (5) inside the telescopic tube (5), thereby maintaining the tendency of the movable nut (6) and the telescopic tube (5) to move synchronously.

5. The electric push rod for a range hood according to any one of claims 1 to 3, characterized in that: The dustproof sealing cover (7) includes a cover body (71) and an elastic clip (72) disposed inside the cover body (71). The elastic clip (72) is disposed on the outer periphery of the telescopic tube (5). The elastic clip (72) includes an outer spring plate (721) and an inner spring plate (722). The outer spring plate (721) is wavy and annular. The inner spring plate (722) is disposed inside the outer spring plate (721). The inner spring plate (722) has at least two arc-shaped segments. The outer spring plate (721) abuts against the cover body (71) and presses the inner spring plate (722) inward to clamp the outer periphery of the telescopic tube (5). The number and position of the inner ring spring plates (722) correspond to the rotating block (11).

6. The electric push rod for a range hood according to any one of claims 1 to 3, characterized in that: The movable nut (6) and the outer shell (2) are keyway fitted.

7. The electric push rod for a range hood according to any one of claims 1 to 3, characterized in that: A second spring (92) is provided between the rotating block (11) and the top rod (4).

8. A range hood, comprising movable parts, characterized in that: The application includes an electric push rod for a range hood as described in any one of claims 1 to 7, used to drive the moving parts.

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