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 comprises a motor, a push rod and a push rod, the screw rod is driven by the motor; the movable nut is in threaded fit with the screw rod, so that the movable nut can linearly move along the screw rod; 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; an elastic piece which is integrally wedge-shaped is arranged on the pipe wall of the telescopic pipe, and when the telescopic pipe retracts to a limit position towards the interior of the shell, the elastic piece corresponds to the dustproof sealing cover; the electric push rod further comprises an ejector rod abutting against or connected with the movable nut, the ejector rod is arranged in 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, so that the ejector rod ejects the elastic piece to protrude out of the peripheral wall of the telescopic pipe, 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 household appliance necessary in resident kitchen. With the continuous progress of technology, the function of range hood is more and more diversified. Like the side suction type range hood commonly used, it is provided with reversible smoke baffle, and the opening and closing of smoke baffle are driven by electric push rod, such as the range hood with smoke baffle disclosed in Chinese patent No. 201922362582.9, 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. Or the lifting type range hood, the height of range hood is adjusted by electric push rod, so that it can adapt to users with different height requirements, so as to be more in line with personal use habits and improve the comfort of use, such as the lifting assembly for lifting type range hood disclosed in Chinese patent No. 202022481273.6, which comprises a push rod motor, an electric push rod and a movable plate. One end of the electric push rod is connected with 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 with 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 range hood, the internal parts are covered and contaminated by oil stains, which can cause the problem of electric push rod jamming and unable to work. Although dustproof sealing element is provided for electric push rod, dust and oil accumulated into oil stains will inevitably be brought in during daily use process. If the range hood is not used for a long time or in special circumstances, the telescopic tube and the sealing element will be adhered. If the motor power is small, the telescopic tube will be jammed and cannot 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 amplify the pushing force after jamming and realize automatic repair after jamming.

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

[0007] The utility model discloses a technical scheme for solving the first technical problem is as follows: an electric push rod, comprising:

[0008] Motor;

[0009] Lead screw, which is driven by the motor to rotate around its axis;

[0010] Moving nut, which is sleeved on the lead screw and threadedly matched with the lead screw, so as to be linearly movable along the lead screw;

[0011] Telescopic tube, which is sleeved on the moving nut and keeps the tendency of synchronous linear movement;

[0012] Housing, in which the lead screw, 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] Dustproof sealing cover, which is arranged at the end of the housing away from the motor, and the telescopic tube passes out of the dustproof sealing cover to the outside of the housing; characterized in that:

[0014] The telescopic tube is provided with an elastic member in the form of a whole wedge on the tube wall, and the elastic member corresponds to the dustproof sealing cover when the telescopic tube is retracted to the limit position in the housing.

[0015] The electric push rod further comprises a top rod abutting against or connected to the moving nut, and the top rod is arranged in 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 lead screw relative to the telescopic tube, so as to push the elastic member through the top rod and protrude outward from the peripheral wall of the telescopic tube, and the telescopic tube and the dustproof sealing cover are pried apart.

[0016] By arranging the elastic member in the form of a wedge structure on the tube wall of the telescopic tube and enabling the moving nut and the telescopic tube to have a certain axial relative movement, the elastic member on the tube wall of the telescopic tube can be extruded and expanded outward to protrude from the telescopic tube by the movement of the moving nut and the top rod when the telescopic tube is stuck with the dustproof sealing cover and cannot move axially, so as to pry apart the dustproof sealing cover, amplify the thrust of the motor by the wedge slope structure, realize 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, moves synchronously with the moving nut, and the elastic member can also be reset by its own elasticity without manual operation.

[0017] Further, in order to facilitate the expansion and reset of the elastic member, the tube wall of the telescopic tube is hollow at the position corresponding to the elastic member, one end of the elastic member close to the top rod is connected to the tube wall of the telescopic tube, and the other end of the elastic member away from the top rod is a free end.

[0018] In order to facilitate the ejection of the elastic element when the ejector rod moves, the elastic element has an outer surface facing the outside of the telescopic tube and an inner surface located in the telescopic tube, the outer surface is flush with the outer peripheral wall of the telescopic tube when the elastic element is not subjected to the force of the ejector rod, and the inner surface protrudes from the inner peripheral wall of the telescopic tube by a certain height, and the inner surface gradually inclines towards the inside of the telescopic tube from the position close to the ejector rod to the position away from the ejector rod.

[0019] Further, in order to facilitate the synchronous movement of the moving nut and the telescopic tube in the normal state, generate relative movement when the telescopic tube 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 tube 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 tube located in the shell is provided with a second annular flange protruding radially inward, and a spring is arranged between the first part of the moving nut and the end of the telescopic tube, so that the first annular flange abuts against the second annular flange of the telescopic tube in the inside of the telescopic tube, thereby maintaining the tendency of synchronous movement of the moving nut and the telescopic tube.

[0020] Preferably, in order to facilitate dustproof sealing of the telescopic tube by clamping the dustproof sealing cover and facilitate the opening of the dustproof sealing cover by the elastic element, the dustproof sealing cover comprises a cover body and an elastic clamp arranged in the cover body, the elastic clamp is arranged on the outer periphery of the telescopic tube, the elastic clamp comprises an outer ring spring piece and an inner ring spring piece, the outer ring spring piece is in a wave-shaped ring 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, the outer ring spring piece abuts against the cover body, and the inner ring spring piece is pressed inward to clamp the outer peripheral wall of the telescopic tube.

[0021] The number and position of the inner ring spring piece correspond to the elastic element respectively.

[0022] Further, in order to avoid rotation of the moving nut, the moving nut and the shell key groove are matched.

[0023] The technical scheme 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.

[0024] Compared with the prior art, the utility model discloses the advantages lie in: through setting up the elastic piece of wedge structure on the pipe wall of telescopic pipe, and make mobile nut and telescopic pipe can have certain axial relative movement, thereby can when telescopic pipe is stuck by dustproof seal cover and cannot axial movement, utilize mobile nut and the movement of the top rod and extrude the elastic piece on the pipe wall of telescopic pipe, make it expand outward and protrude telescopic pipe, further can open dustproof seal cover, utilize wedge inclined plane structure amplification motor thrust, realize stuck automatic repair, and after stuck repair, under the action of spring, telescopic pipe resets to initial state automatically with mobile nut synchronous movement, and the elastic piece can also reset by the elasticity of itself, need not manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is the schematic diagram of electric push rod of the utility model embodiment;

[0026] Figure 2 It is the sectional view of electric push rod of the utility model embodiment;

[0027] Figure 3 It is the schematic diagram of hidden casing of electric push rod of the utility model embodiment;

[0028] Figure 4 It is Figure 3 The exploded structure schematic diagram of;

[0029] Figure 5 It is the schematic diagram of mobile nut and top rod of electric push rod of the utility model embodiment;

[0030] Figure 6 It is the telescopic pipe schematic diagram of electric push rod of the utility model embodiment;

[0031] Figure 7 It is the local sectional view (normal state) of telescopic pipe and elastic clamp cooperation of electric push rod of the utility model embodiment;

[0032] Figure 8 It is the schematic diagram of elastic clamp of electric push rod of the utility model embodiment;

[0033] Figure 9 It is the sectional front view (normal state) of electric push rod of the utility model embodiment;

[0034] Figure 10 It is the sectional front view (repair state) of electric push rod of the utility model embodiment;

[0035] Figure 11 It is Figure 9 The local I amplification schematic diagram of;

[0036] Figure 12 It is Figure 10a local II amplification schematic diagram. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, since the embodiments disclosed 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.

[0039] Referring to Figures 1-8 An electric push rod can be used for a range hood to drive the movable parts of the range hood to overturn, lift, etc.

[0040] The electric push rod comprises a motor 1, a housing 2, a screw rod 3, a top rod 4, a telescopic tube 5, a moving nut 6 and a dustproof sealing cover 7. The motor 1 is connected to one end of the housing 2, and its output end extends into the housing 2, and can drive the screw rod 3 to rotate around its own axis through the meshing 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. The moving nut 6 can cooperate with the key groove of the housing 2, so as to prevent the moving nut 6 from rotating.

[0041] The telescopic tube 5 is partially located in the housing 2, and is sleeved on the moving nut 6, both of which 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, 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 on 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 spring 9 is arranged between the first part 61 of the moving nut 6 and the end of the telescopic tube 5, so as to avoid axial relative movement of the two in a normal state, i.e., the two annular flanges are in close contact with each other in the normal state. The telescopic tube 5 is used for connecting the load of the electric push rod.

[0042] 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, and the elastic clamp 72 is arranged on the outer periphery of the telescopic tube 5. The elastic clamp 72 comprises an outer ring spring sheet 721 and an inner ring spring sheet 722, the outer ring spring sheet 721 is 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 the form of arcs. 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, thereby clamping the outer peripheral wall of the telescopic tube 5, so as to limit the telescopic tube 5 from shaking and prevent impurities from being brought into the housing 2 by the telescopic tube 5.

[0043] An elastic piece 52 in the form of a whole wedge is arranged on the tube wall of the telescopic tube 5, and the tube wall of the telescopic tube 5 can be hollowed out at the position corresponding to the elastic piece 52. The elastic piece 52 is in the form of a spring sheet. The elastic piece 52 has an outer surface 521 facing outward of the telescopic tube 5 and an inner surface 522 located in the telescopic tube 5. When the telescopic tube 5 is retracted into the housing 2 to the limit position, the position of the elastic piece 52 corresponds to the elastic clamp 72. In a normal state, the outer surface 521 is flush with the outer peripheral wall of the telescopic tube 5, and the inner surface 522 protrudes from the inner peripheral wall of the telescopic tube 5 by a certain height. The number and position of the elastic pieces 52 correspond to the inner ring spring sheet 722 respectively.

[0044] 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 abuts or is connected with the moving nut 6, and the other end of the top rod 4 extends to be adjacent to the elastic member 52 (not more than the elastic clamp 72) when the telescopic tube 5 is contracted to the limit position. The elastic member 52 is connected with the tube wall of the telescopic tube 5 at one end close to the top rod 4, and the other end of the elastic member 52 is a free end. The inner surface 522 of the elastic member 52 gradually inclines to the inside of the telescopic tube 5 from the position close to the top rod 4 to the position away from the top rod 4, that is, the height of the inner periphery wall of the telescopic tube 5 gradually increases. The inner surface 522 can expand outward and protrude from the outer periphery wall of the telescopic tube 5 after being pressed by force.

[0045] Referring to Figure 9 and Figure 11 , when the electric push rod normally works, the motor 1 drives the telescopic tube 5 to extend out of or retract into the shell 2, and the telescopic tube 5 and the moving nut 6 are relatively static. The dustproof sealing cover 7 will inevitably be brought into dust and oil accumulated into oil stains during daily use. If the telescopic tube and the elastic clamp 72 are adhered under special conditions 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 monitored, the motor 1 is operated, referring to Figure 10 and Figure 12 , the screw rod 3 drives the moving nut 6 to move forward (shown as right in the figure) by a certain distance. Since the telescopic tube 5 is stuck and cannot be pushed by the spring 9, the spring 9 is gradually compressed, the moving nut 6 moves forward to push the top rod 4 to move, the end of the top rod 4 presses the inner surface 522 of the elastic member 52, the inner surface 522 expands outward and protrudes from the outer periphery wall of the telescopic tube 5 after being pressed by force, thereby supporting 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 the motor 1 is reversely operated 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 elastic member 52 resets under the action of its own elastic force, and the top rod 4 is pushed backward to reset to Figure 9 , so that 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 telescopic tube (5) is provided with an elastic element (52) that is wedge-shaped in its entirety. When the telescopic tube (5) retracts into the outer shell (2) to its limit position, the elastic element (52) corresponds to the dustproof sealing cover (7). The electric push rod also includes a push rod (4) that abuts against or connects to the movable nut (6). The push rod (4) is set inside 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 pushing the elastic element (52) outward through the push rod (4) to protrude outward from the outer peripheral wall of the telescopic tube (5) and push the telescopic tube (5) and the dustproof sealing cover (7) apart.

2. The electric push rod for a range hood according to claim 1, characterized in that: The wall of the telescopic tube (5) is hollowed out at the position corresponding to the elastic element (52). The end of the elastic element (52) near the top rod (4) is connected to the wall of the telescopic tube (5), and the end of the elastic element (52) away from the top rod (4) is the free end.

3. The electric push rod for a range hood according to claim 2, characterized in that: The elastic element (52) has an outer surface (521) facing outward from the telescopic tube (5) and an inner surface (522) located inside the telescopic tube (5). When the elastic element (52) is not subjected to the force of the push rod (4), the outer surface (521) is flush with the outer peripheral wall of the telescopic tube (5), and the inner surface (522) extends out of the inner peripheral wall of the telescopic tube (5) at a certain height. The inner surface (522) gradually tilts towards the inside of the telescopic tube (5) from the position close to the push rod (4) towards the direction away from the push rod (4).

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 spring (9) 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 spring plates (722) correspond to those of the elastic element (52).

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. 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 6, used to drive the moving parts.

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