Movement mechanism and range hood

Abstract

The movement mechanism comprises a power part, a driving part, a driving part and a driving part, the screw rod is connected with the power output end of the power part and can rotate around the axis of the screw rod under the driving of the power part; the nut is sleeved on the periphery of the screw rod, is in threaded connection with the screw rod and can move along the axis direction of the screw rod; the nut is made of a material which can expand after being heated, and the nut in the expanded state tightly holds the periphery of the screw rod so as to reduce the fit clearance between the nut and the screw rod; the movement mechanism further comprises a heating part which acts on the nut to heat the nut. The temperature of the nut can be adjusted by controlling the heating component to work according to different working conditions, so that the self-adaptive adjusting capacity of the fit clearance between the nut and the screw is improved, the friction force between the nut and the screw is effectively adjusted, and the self-locking capacity of the movement mechanism is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of household appliances, and particularly relates to a movement mechanism and a range hood. BACKGROUND

[0002] The existing range hood relies on the operation of an internal fan system to form a negative pressure area, and the oil fume flow in the kitchen is discharged outdoors after passing through the range hood under the action of atmospheric pressure. In order to avoid oil fume escape, a movable smoke baffle is generally arranged at the smoke inlet of the range hood, such as the Chinese invention patent “Range hood and control method thereof” with the application number CN202210368637.0 and the authorization announcement number CN114738807B, which comprises a shell and a panel arranged at the front side of the shell, and the panel is provided with an air inlet. The range hood further comprises a smoke baffle for opening and closing the air inlet and a movement mechanism for driving the smoke baffle, the movement mechanism comprises a driving mechanism, a transmission mechanism for transmitting the output of the driving mechanism to the smoke baffle, and a rotating shaft, the transmission mechanism comprises a connecting rod fixed with the smoke baffle, the rotating shaft is fixed in the shell, the connecting rod is sleeved on the rotating shaft and can rotate relative to the rotating shaft, the range hood further comprises a piezoelectric module for changing the damping of the rotation of the connecting rod relative to the rotating shaft, so as to compensate for the rotation speed of the smoke baffle; a position detection switch for detecting the current position of the smoke baffle.

[0003] For example, the Chinese utility model patent “Range hood” with the application number CN202220590316.0 and the authorization announcement number CN217274376U, which comprises a smoke collecting hood, the front side of the smoke collecting hood is provided with an air inlet, the range hood further comprises a smoke baffle capable of being reversibly opened or closed to open or close the air inlet, and a movement mechanism assembly for driving the smoke baffle to act, the movement mechanism assembly comprises a first movement mechanism, the first movement mechanism comprises a driving mechanism, a first connecting rod, a second connecting rod and a transmission shaft, the transmission shaft is arranged in the smoke collecting hood and extends left and right, the driving mechanism is used for driving the transmission shaft to rotate around its axis, one end of the first connecting rod is fixed with the transmission shaft and the other end is connected with the smoke baffle, one end of the second connecting rod is rotatably arranged in the smoke collecting hood and the other end is connected with the smoke baffle.

[0004] The existing movement mechanism for driving the movable components such as the smoke baffle to move generally adopts an electric push rod, a hydraulic cylinder and the like. If such a movement mechanism has the problem of insufficient self-locking force, it will cause the movement trajectory of the movable component to be inconsistent with the preset movement trajectory, thereby affecting the function of the movable component. Specifically, if the self-locking force of the electric push rod driving the smoke baffle to move is insufficient, it will cause the smoke baffle to be unable to open to the designated position or to be unable to close tightly, thereby affecting the user's experience. UTILITY MODEL CONTENTS

[0005] The first technical problem to be solved by the utility model is to provide a movement mechanism to improve self-locking ability.

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

[0007] The technical scheme adopted by the utility model to solve the above first technical problem is as follows: a movement mechanism comprises:

[0008] a power element;

[0009] a screw rod connected with the power output end of the power element and capable of rotating around its own axis under the drive of the power element;

[0010] a nut sleeved on the outer periphery of the screw rod and threadedly connected with the screw rod and capable of moving along the axial direction of the screw rod;

[0011] characterized in that:

[0012] the nut is made of a material capable of expanding after being heated, and the nut in the expanded state tightly embraces the outer periphery of the screw rod to reduce the fitting gap between the nut and the screw rod;

[0013] the movement mechanism further comprises:

[0014] a heating component acting on the nut to heat the nut.

[0015] Since the nut is made of a material capable of expanding after being heated, the temperature of the nut can be adjusted by controlling the operation of the heating component according to different working conditions, thereby improving the self-adaptive adjustment ability of the fitting gap between the nut and the screw rod, effectively adjusting the friction between the nut and the screw rod, and improving the self-locking ability of the movement mechanism.

[0016] Preferably, the heating component is an electric heating wire that generates heat after being electrified, and the two ends of the electric heating wire are respectively used to connect the positive pole and the negative pole of the power supply. In this way, the temperature of the electric heating wire can be adjusted by adjusting the current size of the electric heating wire, which is convenient to operate.

[0017] Preferably, the end surface of the nut is provided with a circumferentially extending annular groove, a part of the electric heating wire is constrained in the annular groove so that the electric heating wire can move together with the nut, and the two ends of the electric heating wire are located on the side of the screw rod.

[0018] Further, the two ends of the electric heating wire are respectively connected to the positive pole and the negative pole of the power supply through respective flexible wires. In this way, the movement of the nut does not affect the power supply of the electric heating wire, and since the two ends of the electric heating wire are located on the side of the screw rod, the arrangement of the wires does not affect the movement of the nut.

[0019] In the above solutions, preferably, the power element is an electric motor, the movement mechanism is an electric push rod, and further comprising a rod body extending along the axial direction of the screw rod, the first end of the rod body is constrained with the nut and can move together with the nut, and the second end of the rod body is a free end.

[0020] Further, a controller for controlling the working of the heating component is further included, and the controller is arranged to control the working of the heating component according to the difference between the real-time current of the electric motor and the preset safe current of the electric motor.

[0021] The utility model discloses the technical scheme adopted for solving the above-mentioned second technical problem is: a range hood with the movement mechanism as described above, characterized in that: the range hood further comprises a movable component driven by the movement mechanism.

[0022] Preferably, the range hood further comprises a smoke collecting hood, and the inside is hollow to form a smoke collecting cavity with a smoke inlet and a smoke outlet; the movable component is a smoke baffle arranged at the smoke inlet, and the smoke baffle is movable to open or close the smoke inlet under the action of the movement mechanism. The smoke baffle can ensure that the position is in place when opening or closing the smoke inlet under the driving of the movement mechanism of the utility model.

[0023] Compared with the prior art, the utility model has the advantages that: since the nut is made of a material that can expand after being heated, the temperature of the nut can be adjusted by controlling the working of the heating component according to different working conditions, thereby improving the self-adaptive adjustment capability of the fitting gap between the nut and the screw rod, and effectively adjusting the friction between the nut and the screw rod, and improving the self-locking capability of the movement mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a movement mechanism according to an embodiment of the utility model;

[0025] Figure 2 FIG. 2 is a sectional view of FIG. 1 along the direction of A-A; Figure 1

[0026] Figure 3 FIG. 3 is a partial structural schematic diagram of the movement mechanism according to the embodiment of the utility model;

[0027] Figure 4 FIG. 4 is a three-dimensional exploded view of the nut and the heating component according to the embodiment of the utility model;

[0028] Figure 5 ​A structure schematic view of the heating component of the embodiment of the utility model;

[0029] Figure 6 A structure schematic view of the range hood of the embodiment of the utility model (the smoke baffle opens the smoke inlet);

[0030] Figure 7 For Figure 6 The sectional view of the range hood (the section is the vertical plane extending front and back);

[0031] Figure 8 A structure schematic view of the range hood of the embodiment of the utility model (the smoke baffle closes the smoke inlet);

[0032] Figure 9 For Figure 8 The sectional view of the range hood (the section is the horizontal plane). Specific implementation

[0033] The utility model will be further described in detail in combination with the drawings.

[0034] As Figures 1 to 9 Indicated, it is a preferred embodiment of the utility model of a movement mechanism and range hood, the movement mechanism 100 is electric push rod, it includes motor as power piece 1 and sleeve 10, screw rod 2, nut 3, heating component 4, rod body 5 and controller.

[0035] Screw rod 2 is along the axial direction in sleeve 10, and one end of screw rod 2 is connected with the power output end of power piece 1, the other end of screw rod 2 is free end, and screw rod 2 can rotate around its axis under the drive of power piece 1. In the embodiment, the output shaft of motor and one end of screw rod 2 are connected through gear transmission.

[0036] Nut 3 can be axially moved and is arranged in sleeve 10 (same as prior art, sleeve 10 is provided with the component for preventing the circumferential rotation of nut 3), and nut 3 is sleeved on the outer periphery of screw rod 2 and is threadedly connected with screw rod 2 to move along the axial direction of screw rod 2. And, nut 3 is the material that can expand after being heated (specifically polyformal POM), and the expanded nut 3 tightly holds the outer periphery of screw rod 2 to reduce the fit clearance between nut 3 and screw rod 2.

[0037] The above-mentioned rod body 5 extends along the axial direction of screw rod 2, and the first end of rod body 5 is constrained together with nut 3 and can move together with nut 3, and the second end of rod body 5 is the free end exposed outside sleeve 10. With the movement of nut 3, rod body 5 can be extended and retracted relative to sleeve 10.

[0038] The heating component 4 acts on the nut 3 to heat the nut 3. In the embodiment, the heating component 4 is an electric heating wire which generates heat after being electrified, the end surface of the nut 3 is provided with a circumferentially extending annular groove 31, and the electric heating wire is partially constrained in the annular groove 31 so that the electric heating wire can move together with the nut 3, and the two ends of the electric heating wire are located at the side of the screw rod 2, and the two ends of the electric heating wire are connected to the positive and negative poles of the power supply through respective flexible wires (not shown in the figure, which are similar in structure to the existing flexible USB data line, and when the two ends of the electric heating wire are away from the power supply, the wires are elongated, and when the two ends of the electric heating wire are close to the power supply, the wires are shortened).

[0039] The controller is used to control the working of the heating component 4, and the controller is arranged to control the working of the heating component 4 according to the difference between the real-time current of the motor and the preset safe current of the motor.

[0040] As shown in Figures 6 to 9 , the range hood of the embodiment comprises a smoke collecting hood 6, a smoke baffle 7 and the above-mentioned movement mechanism 100, the smoke collecting hood 6 is internally hollow to form a smoke collecting cavity 60 with a smoke inlet 6a and a smoke outlet, the smoke baffle 7 is arranged at the smoke inlet 6a and is movable to open or close the smoke inlet 6a under the action of the second end of the rod body 5 of the movement mechanism 100.

[0041] In the embodiment, as shown in Figure 7 , when the rod body 5 of the electric push rod moves to retract relative to the sleeve 10, the electric push rod can drive the smoke baffle 7 to open the smoke inlet 6a, and during the opening process, the difference between the real-time current of the motor and the preset safe current of the motor is compared, if the real-time current of the motor is greater than or equal to the preset safe current, the electric push rod continues to work until the smoke baffle 7 is opened to the position; if the real-time current of the motor is less than the preset safe current, it indicates that the current is too small, and the friction between the screw rod 2 and the nut 3 is small, at this time, the controller controls the working of the heating component 4 to heat the nut 3, so that the nut 3 expands, the fitting gap between the nut 3 and the screw rod 2 is reduced, the friction between the two is increased, and the self-locking ability of the movement mechanism is improved.

Claims

1. A motion mechanism comprising: Power part (1); The screw (2) is connected to the power output end of the power member (1) and can rotate around its own axis under the drive of the power member (1); a nut (3) which is sleeved on the outer periphery of the screw (2) and is threadably connected to the screw (2) and is movable along the axial direction of the screw (2); Its characteristics are: The nut (3) is made of a material that expands when heated, and the nut (3) in the expanded state tightly embraces the outer periphery of the screw (2) to reduce the fitting clearance between the nut (3) and the screw (2); The motion mechanism also includes: A heating member (4) acts on the nut (3) to heat the nut (3).

2. The motion mechanism according to claim 1, characterized in that: The heating component (4) is a heating wire that generates heat when powered on, and the two ends of the heating wire are respectively used to connect to the positive electrode and the negative electrode of the power supply.

3. The motion mechanism according to claim 2, characterized in that: The end surface of the nut (3) is provided with a circumferentially extending annular groove (31), and the heating wire is partially constrained in the annular groove (31) so that the heating wire can move with the nut (3), and the two ends of the heating wire are located beside the screw (2).

4. The motion mechanism according to claim 3, characterized in that: The two ends of the heating wire are respectively connected to the positive electrode and the negative electrode of the power supply through respective retractable wires.

5. The motion mechanism according to any one of claims 1 to 4, characterized in that: The power member (1) is a motor, the motion mechanism is an electric push rod, and further comprises a rod body (5) extending along the axial direction of the screw rod (2), the first end of the rod body (5) is constrained together with the nut (3) and can move with the nut (3), and the second end of the rod body (5) is a free end.

6. The motion mechanism according to claim 5, characterized in that: The invention also comprises a controller for controlling the operation of the heating component (4), wherein the controller is arranged to control the operation of the heating component (4) according to the difference between the real-time current of the motor and the preset safety current of the motor.

7. A range hood having a motion mechanism according to any one of claims 1 to 6, characterized in that: The range hood further comprises a movable component driven by the motion mechanism.

8. The range hood according to claim 7, characterized in that: The range hood further comprises a smoke collecting hood (6), the interior of which is hollow to form a smoke collecting chamber (60) with a smoke inlet (6a) and a smoke outlet; the movable component is a smoke baffle (7) provided at the smoke inlet (6a), and the smoke baffle (7) moves under the action of a motion mechanism to open or close the smoke inlet (6a).

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