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; the screw rod is driven by the motor; the movable nut is in threaded fit with the lead screw; the first telescopic pipe is arranged on the movable nut in a sleeving mode and keeps the trend of synchronous linear movement; the motor is connected to one end of the shell; and a dustproof sealing cover; the end, away from the movable nut, of the first telescopic pipe is sleeved with a second telescopic pipe, and the second telescopic pipe penetrates out of the dustproof sealing cover. The electric push rod further comprises an ejector rod abutting against the movable nut and a hydraulic cylinder piston structure, the hydraulic cylinder piston structure comprises a first piston, a second piston and a hydraulic cylinder, the hydraulic cylinder comprises a first cavity and a second cavity, and the diameter of the first cavity is smaller than that of the second cavity. The first piston abuts against the end, away from the movable nut, of the ejector rod and extends into a first cavity of the hydraulic cylinder, and the second piston abuts against the second telescopic pipe and extends into a second cavity of the hydraulic cylinder.

Description

Technical Field

[0001] This utility model relates to a power device, and more particularly to an electric push rod for a range hood, and a range hood using the electric push rod. Background Technology

[0002] Range hoods have become an essential household appliance in residential kitchens. With continuous technological advancements, the functions of range hoods are becoming increasingly diverse. For example, the commonly used side-draft range hood is equipped with a flip-up smoke baffle, which is opened and closed by an electric push rod. See Chinese Patent Application No. 201922362582.9 for a submersible range hood with a smoke baffle, which includes a smoke collection hood assembly, an air inlet located at the lower part of the smoke collection hood assembly, a smoke baffle body movable and covered on the air inlet, an opening and closing mechanism disposed within the smoke collection hood assembly to flip the smoke baffle body outward, and a drive mechanism for driving the opening and closing mechanism. The drive mechanism can be an electric push rod hinged to one of the fixed plates. Alternatively, a lift-up range hood can be used, employing an electric push rod to adjust its height, adapting to users with different height requirements and thus better meeting individual usage habits and improving comfort. For example, see Chinese Patent Application No. 202022481273.6, which discloses a lifting component for a lift-up range hood, including 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 inside the smoke collection hood of the range hood, and the push rod motor is fixed to the housing above the smoke collection hood, thereby driving the smoke collection hood to rise and fall relative to the housing.

[0003] After prolonged use, the internal components of a range hood can become contaminated with grease, causing the electric push rod to jam and malfunction. Although the electric push rod is equipped with dustproof seals, dust and grease inevitably accumulate in the extension tube during daily use, forming a buildup. If the range hood is not used for an extended period, the extension tube and seals may stick together, and if the motor power is insufficient, the extension tube may become stuck and unable to extend.

[0004] Therefore, further improvements are needed. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing an electric push rod for a range hood that can amplify the thrust after jamming and achieve automatic repair after jamming.

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

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

[0008] Electric motor;

[0009] A lead screw, which is driven by a motor to rotate around its own axis;

[0010] A movable nut is fitted onto the lead screw and threaded into it, allowing it to move linearly along the lead screw.

[0011] The first telescopic tube is fitted onto the movable nut and maintains a synchronous linear movement trend;

[0012] The housing, the lead screw, the movable nut, and at least a portion of the first telescopic tube are located within the housing, and the motor is connected to one end of the housing; and

[0013] A dustproof sealing cover is located at the end of the housing furthest from the motor; its characteristic is:

[0014] A second telescopic tube is fitted onto the end of the first telescopic tube away from the movable nut. The first and second telescopic tubes move in a synchronous linear motion. The second telescopic tube extends out from the dustproof sealing cover.

[0015] The electric push rod also includes a push rod that abuts against the movable nut and a hydraulic cylinder piston structure disposed in the first telescopic tube. The push rod is disposed in the first telescopic tube. The hydraulic cylinder piston structure includes a first piston, a second piston, and a hydraulic cylinder. The hydraulic cylinder includes a first cavity away from the second telescopic tube and a second cavity close to the second telescopic tube. The diameter of the first cavity is smaller than the diameter of the second cavity. The first piston abuts against the end of the push rod away from the movable nut and extends into the first cavity of the hydraulic cylinder. The second piston abuts against the second telescopic tube and extends into the second cavity of the hydraulic cylinder.

[0016] When the second telescopic tube is jammed with the dustproof sealing cover, the movable nut can move relative to the first telescopic tube along the axial direction of the screw, thereby pushing the first piston through the push rod, and then pushing the second piston through the liquid in the cylinder, so that the second telescopic tube moves relative to the dustproof sealing cover.

[0017] By setting up a first telescopic tube and a second telescopic tube that can move synchronously, and allowing the two telescopic tubes to move relative to each other when the second telescopic tube and the dustproof sealing cover are stuck, the thrust of the motor can be amplified by the hydraulic cylinder piston structure inside the first telescopic tube, thereby pushing the second telescopic tube to achieve automatic repair of the stuck position. After the stuck position is repaired, the second telescopic tube automatically returns to its initial state under the action of the spring, which also resets the hydraulic cylinder piston structure, eliminating the need for manual operation.

[0018] To prevent liquid leakage from the cylinder, a first sealing ring is provided at the connection between the first piston and the cylinder, and a second sealing ring is provided at the connection between the second piston and the cylinder.

[0019] Furthermore, to facilitate the synchronous movement of the movable nut and the telescopic tube under normal conditions, and to generate relative movement when the telescopic tube is jammed, while preventing separation during relative movement, the movable nut includes a first part and a second part coaxially arranged. The outer diameter of the second part is smaller than that of the first part. The first telescopic tube is sleeved on the outer periphery of the second part. The movable nut also includes a first annular protrusion formed at the end of the second part away from the first part. The first annular protrusion protrudes radially outward. The end of the first telescopic tube located inside the outer shell has a second annular protrusion protruding radially inward. A first spring is provided between the first part of the movable nut and the end of the first telescopic tube, so that the first annular protrusion abuts against the second annular protrusion inside the first telescopic tube, thereby maintaining the synchronous movement of the movable nut and the first telescopic tube.

[0020] Furthermore, to facilitate the synchronous movement of the first and second telescopic tubes under normal conditions, and to enable relative movement when the second telescopic tube is jammed, while preventing separation during relative movement, the end of the second telescopic tube extends into the first telescopic tube. The end of the first telescopic tube facing the second telescopic tube has an inwardly protruding third annular convex edge, and the end of the second telescopic tube facing the first telescopic tube has an outwardly protruding fourth annular convex edge. A second spring is provided between the third and fourth annular convex edges to maintain the synchronous movement of the first and second telescopic tubes.

[0021] Preferably, to facilitate the dustproof sealing cover clamping the telescopic tube and thus achieving a dustproof sealing effect, the dustproof sealing cover includes a cover body and an elastic clip disposed within the cover body. The elastic clip is disposed on the outer periphery of the first telescopic tube. The elastic clip includes an outer spring plate and an inner spring plate. The outer spring plate is wavy and annular. The inner spring plate is disposed within the outer spring plate and has at least two arc-shaped segments. The outer spring plate abuts against the cover body, pressing the inner spring plate inward to clamp the outer peripheral wall of the second telescopic tube.

[0022] Furthermore, to prevent the movable nut from rotating, the movable nut is fitted with a keyway in the housing.

[0023] The technical solution adopted by this utility model to solve the second technical problem mentioned above is: a range hood, including a movable part, characterized in that: an electric push rod for a range hood as described above is used to drive the movable part.

[0024] Compared with the prior art, the advantages of this utility model are as follows: by setting a first telescopic tube and a second telescopic tube that can maintain synchronous movement, and allowing the two telescopic tubes to move relative to each other when the second telescopic tube and the dustproof sealing cover are stuck, the thrust of the motor can be amplified by the hydraulic cylinder piston structure in the first telescopic tube, thereby pushing the second telescopic tube to achieve automatic repair of the stuck position. After the stuck position is repaired, the second telescopic tube automatically returns to its initial state under the action of the spring, which also resets the hydraulic cylinder piston structure, eliminating the need for manual operation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the electric push rod according to an embodiment of the present utility model;

[0026] Figure 2 This is a cross-sectional view of the electric push rod according to an embodiment of the present utility model;

[0027] Figure 3 for Figure 2 A magnified schematic diagram of part I;

[0028] Figure 4 This is a schematic diagram of the hidden housing of the electric push rod according to an embodiment of the present utility model;

[0029] Figure 5 for Figure 4 A schematic diagram of the decomposed structure;

[0030] Figure 6 This is a partial structural schematic diagram of the electric push rod according to an embodiment of the present utility model;

[0031] Figure 7 for Figure 6 A schematic diagram of the decomposed structure;

[0032] Figure 8 for Figure 6 A sectional view;

[0033] Figure 9 This is a schematic diagram of the elastic clamp of the electric push rod according to an embodiment of the present utility model;

[0034] Figure 10 This is a schematic diagram of the movable nut of the electric push rod in an embodiment of the present utility model;

[0035] Figure 11 This is a sectional front view (normal state) of the electric actuator according to an embodiment of the present utility model;

[0036] Figure 12 This is a sectional front view (in repair state) of the electric actuator according to an embodiment of the present utility model;

[0037] Figure 13 for Figure 11 A magnified schematic diagram of part II;

[0038] Figure 14 for Figure 12 A magnified schematic diagram of part III. Detailed Implementation

[0039] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0040] In the description of this utility model, 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," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0041] See Figures 1-10 An electric push rod can be used in range hoods to drive the moving parts of the range hood to flip, lift, etc.

[0042] The electric linear actuator includes a motor 1, a housing 2, a lead screw 3, a push rod 4, a first telescopic tube 51, a second telescopic tube 52, a movable nut 6, and a dustproof sealing cover 7. The motor 1 is connected to one end of the housing 2, and its output end extends into the housing 2. The motor 1 drives the lead screw 3 to rotate around its own axis via a meshing worm gear 81 and worm 82. The worm 82 is coaxial with the output shaft of the motor 1, while the worm gear 81 is fixedly mounted on the outer circumference of the lead screw 3 and rotates synchronously with it. The movable nut 6 is sleeved on the outer circumference of the lead screw 3 and threadedly engages with it, so that when the lead screw 3 rotates, the movable nut 6 can move linearly along the lead screw 3. The worm gear 81, worm 82, lead screw 3, and movable nut 6 are all housed within the housing 2. The movable nut 6 engages with a keyway in the housing 2, thereby preventing the movable nut 6 from rotating.

[0043] When retracted, the first telescopic tube 51 is located inside the outer casing 2, and when extended, it partially extends outside the outer casing 2, fitting onto the movable nut 6. The two can move relative to each other a limited distance along the axial direction of the lead screw 3. The movable nut 6 includes an integrally formed, coaxially arranged first part 61 and second part 62. The outer diameter of the second part 62 is smaller than that of the first part 61, and the first telescopic tube 51 fits around 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 protruding radially outward. The end of the first telescopic tube 51 located inside the outer casing 2 has a second annular protrusion 511 protruding radially inward. The first annular protrusion 63 can abut against the second annular protrusion 511 inside the first telescopic tube 51, thereby preventing the movable nut 6 and the first telescopic tube 51 from separating. A first spring 91 is provided between the first part 61 of the movable nut 6 and the end of the first telescopic tube 51 to prevent relative axial movement between the two in normal conditions, i.e., the two annular protrusions are tightly pressed together in normal conditions.

[0044] A second telescopic tube 52 is fitted onto the end of the first telescopic tube 51 furthest from the moving nut 6. The connection between the first telescopic tube 51 and the second telescopic tube 52 is the same as that between the first telescopic tube 51 and the moving nut 6, i.e., it also uses an annular convex edge to limit and prevent separation. Thus, the first telescopic tube 51 and the second telescopic tube 52 can also move relative to each other a limited distance along the axial direction of the lead screw 3. The end of the second telescopic tube 52 extends into the first telescopic tube 51. The end of the first telescopic tube 51 facing the second telescopic tube 52 has an inwardly protruding third annular convex edge 512, and the end of the second telescopic tube 52 facing the first telescopic tube 51 has an outwardly protruding fourth annular convex edge 521. A second spring 92 is provided between the third annular convex edge 512 and the fourth annular convex edge 521 to prevent them from moving relative to each other along the axial direction under normal conditions. The second telescopic tube 52 is used to connect the load of the electric push rod.

[0045] The dustproof sealing cover 7 is located at the end of the outer casing 2 away from the motor 1. The end of the first telescopic tube 51 away from the moving nut 6 is fitted with the second telescopic tube 52. When the first telescopic tube 51 is fully retracted inside the outer casing 2, its end is close to the dustproof sealing cover 7, while the second telescopic tube 52 passes through the dustproof sealing cover 7 and extends out of the dustproof sealing cover 7.

[0046] A dustproof sealing cover 7 is located at the end of the outer casing 2 furthest from the motor 1. The dustproof sealing cover 7 includes a cover body 71 and an elastic clip 72 disposed within the cover body 71. The elastic clip 72 is located 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 a wavy annular spring plate, and the inner spring plate 722 is disposed within the outer spring plate 721. It has at least two arc-shaped segments arranged in a rotationally symmetrical manner. In normal conditions, the outer spring plate 721 abuts against the cover body 71, pressing the inner spring plate 722 inward to clamp the outer periphery of the first telescopic tube 51 or the second telescopic tube 52. This serves to limit the movement of the first telescopic tube 51 and the second telescopic tube 52, preventing them from shaking and preventing impurities from being carried into the outer casing 2 by the second telescopic tube 52.

[0047] The push rod 4 is disposed inside the first telescopic tube 51 and is arranged at intervals around the outer periphery of the lead screw 3. One end of the push rod 4 abuts against the movable nut 6.

[0048] A hydraulic cylinder piston structure 11 is provided inside the first telescopic tube 51, and this structure is arranged adjacent to the second telescopic tube 52. The hydraulic cylinder piston structure 11 includes a first piston 111, a second piston 112, and a hydraulic cylinder 113. The hydraulic cylinder 113 includes a first cavity 1131 located away from the second telescopic tube 52 and a second cavity 1132 located near the second telescopic tube 52. The diameter of the first cavity 1131 is smaller than the diameter of the second cavity 1132. The first cavity 1131 and the second cavity 1132 are interconnected. The hydraulic cylinder 113 is fixed inside the first telescopic tube 51. The first piston 111 abuts against the end of the push rod 4 away from the moving nut 6 and extends into the first cavity 1131 of the hydraulic cylinder 113. The second piston 112 extends into the second cavity 1132 of the hydraulic cylinder 113 and abuts against the second telescopic tube 52. The first cavity 1131 and the second cavity 1132 of the hydraulic cylinder 113 are filled with an oily, incompressible liquid. A first sealing ring 114 is provided at the connection between the first piston 111 and the hydraulic cylinder 113, and a second sealing ring 115 is provided at the connection between the second piston 112 and the hydraulic cylinder 113 to prevent liquid leakage. The above-described hydraulic piston structure can amplify a small thrust.

[0049] See Figure 11 and Figure 13 When the electric push rod is working normally, motor 1 drives the first telescopic tube 51 and the second telescopic tube 52 to extend or retract from the outer casing 2. The first telescopic tube 51, the second telescopic tube 52, and the moving nut 6 are relatively stationary. During daily use, dust and grease inevitably accumulate on the dustproof sealing cover 7 due to the first telescopic tube 51 and the second telescopic tube 52. If the range hood is not used for a long time or under special circumstances, the second telescopic tube 52 and the elastic clip 72 may stick together. If the motor power is insufficient, the second telescopic tube 52 may become stuck and unable to be pushed out. In this case, the above structure can be used to break the adhesive bond between the telescopic tube and the dustproof sealing cover 7. See also Figure 12 and Figure 14 After the second telescopic tube 52 and the elastic clamp 72 are stuck together, the motor 1 and the lead screw 3 drive the moving nut 6 forward (to the right in the figure) a certain distance. Because the first telescopic tube 52 is stuck, the first telescopic tube 51 is also restricted and will not be pushed by the first spring 91. The first spring 91 is gradually compressed. After the moving nut 6 moves forward, it pushes the first piston 111 forward through the push rod 4. The liquid in the cylinder 113 gradually flows from the first cavity 1131 to the second cavity 1132, pushing the second piston 112 forward. According to Pascal's principle, the thrust is amplified (the amplification factor is related to the cross-sectional area of ​​the two cavities). The amplified thrust pushes the second telescopic tube 52 forward, breaking the adhesion between the second telescopic tube 52 and the dustproof sealing cover 7. Then the motor 1 runs in reverse, causing the moving nut 6 to return to its initial position. Due to the action of the second spring 92, the second telescopic tube 52 returns to its initial state, driving the second piston 112 to reset. Thus, the liquid in the cylinder 113 pushes the first piston 111 and the push rod 4 to reset, returning to the initial position. Figure 11 Status, enabling crash repair.

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 first telescopic tube (51) is sleeved on the movable nut (6) and maintains a synchronous linear movement trend; The housing (2), the lead screw (3), the movable nut (6), and at least a portion of the first telescopic tube (51) 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 disposed at the end of the outer casing (2) away from the motor (1); characterized in that: The first telescopic tube (51) is fitted with a second telescopic tube (52) at the end away from the moving nut (6). The first telescopic tube (51) and the second telescopic tube (52) move in a synchronous straight line. The second telescopic tube (52) passes through the dustproof sealing cover (7). The electric push rod also includes a push rod (4) that abuts against the movable nut (6) and a hydraulic cylinder piston structure (11) disposed in the first telescopic tube (51). The push rod (4) is disposed in the first telescopic tube (51). The hydraulic cylinder piston structure (11) includes a first piston (111), a second piston (112), and a hydraulic cylinder (113). The hydraulic cylinder (113) includes a first cavity (1131) away from the second telescopic tube (52) and a second cavity (1132) close to the second telescopic tube (52). The diameter of the first cavity (1131) is smaller than the diameter of the second cavity (1132). The first piston (111) abuts against the end of the push rod (4) away from the movable nut (6) and extends into the first cavity (1131) of the hydraulic cylinder (113). The second piston (112) abuts against the second telescopic tube (52) and extends into the second cavity (1132) of the hydraulic cylinder (113). When the second telescopic tube (52) is jammed with the dustproof sealing cover (7), the movable nut (6) can move relative to the first telescopic tube (51) along the axial direction of the screw (3), thereby pushing the first piston (111) through the push rod (4), and then pushing the second piston (112) through the liquid in the liquid cylinder (113), so that the second telescopic tube (52) moves relative to the dustproof sealing cover (7).

2. The electric push rod for a range hood according to claim 1, characterized in that: A first sealing ring (114) is provided at the connection between the first piston (111) and the liquid cylinder (113), and a second sealing ring (115) is provided at the connection between the second piston (112) and the liquid cylinder (113).

3. The electric push rod for a range hood according to claim 1 or 2, 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 first telescopic tube (51) 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 first telescopic tube (51) located inside the outer shell (2) has a second annular protrusion (511) protruding radially inward. A first spring (91) is provided between the first part (61) of the movable nut (6) and the end of the first telescopic tube (51), so that the first annular protrusion (63) abuts against the second annular protrusion (511) of the first telescopic tube (51) inside the first telescopic tube (51), thereby maintaining the tendency of the movable nut (6) and the first telescopic tube (51) to move synchronously.

4. The electric push rod for a range hood according to claim 1 or 2, characterized in that: The end of the second telescopic tube (52) extends into the first telescopic tube (51). The end of the first telescopic tube (51) facing the second telescopic tube (52) has an inwardly protruding third annular convex edge (512). The end of the second telescopic tube (52) facing the first telescopic tube (51) has an outwardly protruding fourth annular convex edge (521). A second spring (92) is provided between the third annular convex edge (512) and the fourth annular convex edge (521) to maintain the tendency of the first telescopic tube (51) and the second telescopic tube (52) to move synchronously.

5. The electric push rod for a range hood according to claim 1 or 2, characterized in that: The dustproof sealing cover (7) includes a cover body (71) and an elastic clip (72) disposed within the cover body (71). The elastic clip (72) is disposed on the outer periphery of the first telescopic tube (51). 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 within 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 second telescopic tube (52).

6. The electric push rod for a range hood according to claim 1 or 2, 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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