Smoke baffle moving mechanism, control method thereof and extractor hood

Abstract

The application relates to a smoke baffle moving mechanism, a control method thereof and an extractor hood, which can solve the problem of insufficient self-locking force of the moving mechanism, so that the self-locking force can reach the strength limit of the moving mechanism. The smoke baffle moving mechanism comprises a smoke baffle body, a hinge assembly, a driving assembly and a limiting assembly. The hinge assembly comprises a hinge support for being installed on a smoke collecting box and a transmission connecting rod rotatably arranged on the hinge support and fixedly connected with the smoke baffle body. The driving assembly is drivingly connected with the transmission connecting rod and used for driving the transmission connecting rod to rotate so as to drive the smoke baffle body to overturn. The limiting assembly comprises a limiting support installed on the hinge support, an electromagnet arranged on the limiting support, a stopper slidably arranged on the limiting support and matched with the electromagnet, and a limiting pin rotatably arranged on the limiting support and used for abutting against the transmission connecting rod.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a smoke baffle movement mechanism and a control method thereof, and a range hood. Background Art

[0002] With the improvement of people's quality of life, range hoods have become one of the indispensable kitchen appliances in modern families. They are usually installed above the kitchen stove and can absorb the fumes generated during the cooking process, thereby purifying the kitchen environment and improving people's comfort when cooking.

[0003] To expand the smoke trapping range, existing range hoods typically use a push-rod motor to tilt the smoke deflector. However, the flipped smoke deflector often suffers from insufficient self-locking force in the motion mechanism. Currently, two solutions are commonly used to address this issue: The first is to position the connecting rod hinge closer to the dead center when the smoke deflector is in the open position to increase the self-locking force; the second is to redesign the push-rod motor or reducer motor to increase the reduction ratio to enhance the self-locking force.

[0004] However, the four-link and other motion hinge mechanisms in the first solution become more unstable as they get closer to the dead point, and are prone to jamming or shaking. The second solution not only requires an increased development cycle, but also requires that the internal drive motor in the push rod motor or reduction motor be increased in speed to ensure that the opening speed of the smoke damper remains unchanged under large reduction ratios. This will result in greater motion noise, and the increase in speed will also lead to increased wear, resulting in a reduced lifespan of the push rod motor or reduction motor. Summary of the Invention

[0005] Existing solutions for enhancing the self-locking force of smoke shields are either prone to getting stuck or prone to increasing noise, increasing wear and tear, and affecting service life; the present application provides a smoke shield motion mechanism, a control method thereof, and a range hood, which can solve the problem of insufficient self-locking force of the motion mechanism, so that the self-locking force can reach the strength limit of the motion mechanism.

[0006] In order to achieve at least one of the above advantages or other advantages and purposes of the present invention, the present invention provides a smoke baffle movement mechanism, comprising:

[0007] Smoke shield body;

[0008] A hinge assembly comprising a hinge bracket for mounting on the smoke collecting box and a transmission connecting rod rotatably disposed on the hinge bracket and fixedly connected to the smoke baffle body;

[0009] a driving assembly, drivingly connected to the transmission connecting rod, for driving the transmission connecting rod to rotate so as to drive the smoke baffle body to flip; and

[0010] The limit assembly includes a limit bracket installed on the hinge bracket, an electromagnet set on the limit bracket, a stop block slidably set on the limit bracket and cooperating with the electromagnet, and a limit pin rotatably set on the limit bracket and used to abut against the transmission connecting rod.

[0011] According to one embodiment of the present application, when the electromagnet is energized in the forward direction, the block slides down the limit pin under the drive of the electromagnet to prevent the limit pin from rotating, thereby maintaining the mechanical limitation of the transmission link by the limit pin; when the electromagnet is energized in the reverse direction, the block slides away from the limit pin under the drive of the electromagnet to allow the limit pin to rotate, thereby contacting the mechanical limitation of the transmission link by the limit pin.

[0012] According to one embodiment of the present application, the transmission connecting rod includes a transmission shaft drivingly connected to the drive assembly, a crank connecting rod fixedly connected to the transmission shaft and the smoke shield body at both ends, and a limit block protruding from the crank connecting rod and cooperating with the limit pin.

[0013] According to one embodiment of the present application, the crank connecting rod has a first rod segment extending radially from the transmission shaft and a second rod segment extending circumferentially from the first rod segment and fixedly connected to the smoke baffle body; the limit block extends from the first rod segment in a direction away from the second rod segment.

[0014] According to one embodiment of the present application, the limit pin includes a rotating shaft connected to the limit bracket, a sleeve end portion sleeved on the rotating shaft and used to abut against the stop block, and a limit end portion extending radially from the sleeve end portion along the rotating shaft and used to abut against the limit block.

[0015] According to one embodiment of the present application, the rotating shaft is perpendicular to the transmission shaft.

[0016] According to one embodiment of the present application, the limiting bracket includes a rear plate body fixedly connected to the hinge bracket, a pair of side plates extending forward from the rear plate body and plugged into the rotating shaft, and a bottom plate body extending forward from the rear plate body and located below the sleeve end; the rear plate body is provided with a through hole matching the stop block.

[0017] According to one embodiment of the present application, the bottom plate body is provided with a notch matching the limiting end portion so as to avoid the limiting end portion.

[0018] According to one embodiment of the present application, the limiting assembly further includes a reset member disposed between the limiting bracket and the limiting pin; the reset member is a spring whose two ends are respectively connected to the rear plate and the sleeve end.

[0019] According to one embodiment of the present application, the drive assembly includes a push rod motor and a transmission handle; one end of the transmission handle is fixedly connected to the transmission shaft, and the other end of the transmission handle is rotatably connected to the push rod of the push rod motor.

[0020] According to another aspect of the present application, an embodiment of the present application further provides a range hood, comprising:

[0021] fan box;

[0022] a smoke collecting box, arranged below the fan box and having a smoke inlet; and

[0023] Any of the above-mentioned smoke baffle movement mechanisms, wherein the smoke baffle movement mechanism is installed on the smoke collection box and is used to open or close the smoke inlet.

[0024] According to another aspect of the present application, an embodiment of the present application further provides a method for controlling a smoke baffle movement mechanism, comprising the steps of:

[0025] When the range hood is turned on, the push rod motor and the electromagnet are synchronously controlled to be energized in the reverse direction, so that the transmission connecting rod rotates forward under the drive of the push rod motor, drives the smoke baffle body to open the smoke inlet, and causes the stopper to slide away from the limit pin of the limit assembly under the action of the electromagnet; and

[0026] When the smoke baffle body is opened to the right position, the electromagnet is controlled to be energized in the forward direction, so that the block slides toward the limit pin under the action of the electromagnet to achieve self-locking.

[0027] According to one embodiment of the present application, when the smoke baffle body is fully opened, the step of controlling the electromagnet to be energized in the forward direction so that the block slides toward the limit pin under the action of the electromagnet to achieve self-locking includes the following steps:

[0028] When the smoke baffle body is opened to its full position, the push rod travel switch is triggered; and

[0029] After the push rod travel switch is triggered, the electromagnet is controlled to be energized in the forward direction, and the push rod motor is controlled to be de-energized after a predetermined time delay.

[0030] According to one embodiment of the present application, the control method of the smoke baffle movement mechanism further includes the steps of:

[0031] When the range hood is turned off, determining whether the stopper is extended;

[0032] In response to the block being extended, controlling the push rod motor to be energized in the reverse direction, and detecting the real-time reverse current of the push rod motor;

[0033] Determine whether the real-time reverse current is less than a preset current: if so, continue to increase the current of the push rod motor; if not, control the electromagnet to be energized in the reverse direction so that the block slides away from the limit pin; and

[0034] In response to the block not being extended, the push rod motor is controlled to be energized in the forward direction, so that the transmission connecting rod is driven by the push rod motor to rotate in the reverse direction to drive the smoke baffle body to close the smoke inlet.

[0035] According to one embodiment of the present application, in response to the block not being extended, the step of controlling the push rod motor to be energized in the forward direction so that the transmission connecting rod rotates in the reverse direction under the drive of the push rod motor to drive the smoke baffle body to close the smoke inlet includes the steps of:

[0036] Detecting the real-time forward current of the push rod motor; and

[0037] Determine whether the real-time forward current is less than the stall current: if so, control the push rod motor to continue to be energized in the forward direction; if not, control the push rod motor to be de-energized.

[0038] In summary, on the one hand, when the range hood is turned on to perform the fume extraction operation, the transmission connecting rod rotates forwardly under the drive of the driving assembly to drive the smoke baffle body to flip over and open the smoke inlet. At this time, the electromagnet can be energized in the forward direction to drive the block to slide toward the limit pin to prevent the limit pin from rotating, so that the limit pin can mechanically limit the transmission connecting rod to ensure the stable self-locking of the smoke baffle movement mechanism. In theory, the self-locking force can reach the strength limit of the movement mechanism. On the other hand, when the range hood is turned off after completing the fume extraction operation, the electromagnet can be energized in the reverse direction to drive the block to slide away from the limit pin and allow the limit pin to rotate, so that the limit pin can release the mechanical limit on the transmission connecting rod to unlock the smoke baffle movement mechanism, ensuring that the transmission connecting rod can rotate in the reverse direction under the drive of the driving assembly to drive the smoke baffle body to flip over and close the smoke inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a perspective schematic diagram of a range hood according to an embodiment of the present invention;

[0040] Figure 2 A schematic structural diagram of a smoke baffle movement mechanism in a range hood according to the above embodiment of the present application is shown;

[0041] Figure 3 Shown Figure 2 An enlarged schematic diagram of a part A in the movement mechanism of the smoke baffle is shown;

[0042] Figure 4 Shown Figure 2 A schematic cross-sectional view of the smoke baffle movement mechanism shown;

[0043] Figure 5 A perspective view of a limiting component in a smoke screen plate movement mechanism according to the above embodiment of the present application is shown;

[0044] Figure 6 A state diagram of the limiting component when the mechanism is self-locked according to the above embodiment of the present application is shown;

[0045] Figure 7 A state diagram of the limiting component when the mechanism is unlocked according to the above embodiment of the present application is shown;

[0046] Figure 8 A flow diagram of a control method for a smoke screen plate movement mechanism according to an embodiment of the present application is shown;

[0047] Figure 9 A flow diagram of a control step when the smoke screen plate body is opened in a control method for a smoke screen plate movement mechanism according to the above embodiment of the present application is shown;

[0048] Figure 10 A flow diagram of a control step when the smoke screen plate body is closed in a control method for a smoke screen plate movement mechanism according to the above embodiment of the present application is shown;

[0049] Figure 11 An example of a control method for a smoke screen plate movement mechanism according to the above embodiment of the present application is shown.

[0050] Main element symbol explanation:

[0051] 1. Smoke screen plate movement mechanism; 10. Smoke screen plate body; 20. Hinge assembly; 21. Hinge bracket; 22. Transmission connecting rod; 221. Transmission shaft; 222. Crank connecting rod; 2221. First rod segment; 2222. Second rod segment; 223. Limiting block; 30. Drive assembly; 31. Push rod motor; 32. Transmission handle; 40. Limiting assembly; 41. Limiting bracket; 411. Rear plate body; 4110. Through hole; 412. Side plate body; 413. Bottom plate body; 4130. Notch; 42. Electromagnet; 43. Stop block; 44. Limiting pin; 441. Rotation shaft; 442. Socket end; 443. Limiting end; 45. Reset member; 50. Fairing; 2. Smoke collection box; 3. Smoke inlet; 4. Fan box.

[0052] The above main element symbol explanation is further explained in detail in combination with the drawings and specific embodiments. Specific embodiments

[0053] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0055] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0056] Considering that existing four-bar linkages and other kinematic hinge mechanisms become increasingly unstable as they approach dead center, prone to jamming or jittering, and that the internal drive motors in existing push rod motors or reduction motors require increased speeds when operating at high reduction ratios, resulting in greater movement noise, and increased speeds also increase wear, shortening the lifespan of the push rod motor or reduction motor, this application therefore provides a smoke deflector kinematic mechanism, a control method thereof, and a range hood, which address the issue of insufficient self-locking force in the kinematic mechanism, ensuring that the self-locking force reaches the kinematic mechanism's strength limit.

[0057] Specifically, according to another aspect of the present application, Figure 1 As shown, one embodiment of the present application provides a range hood, which may include a fan housing 4, a smoke collection box 2 disposed below the fan housing 4 and having a smoke inlet 3, and a smoke baffle movement mechanism 1 mounted on the smoke collection box 2. The smoke baffle movement mechanism 1 is capable of opening or closing the smoke inlet 3, and when the smoke inlet 3 is opened, the smoke collection area is expanded to improve the oil fume extraction effect. It is understood that the range hood of the present application may also include, but is not limited to, a water tank, a water collection box, and / or a sensor to assist in the oil fume extraction function, which will not be described in detail in this application.

[0058] More specifically, if Figures 2 to 7 As shown, the smoke baffle movement mechanism 1 may include a smoke baffle body 10, a hinge assembly 20, a drive assembly 30, and a limit assembly 40. The hinge assembly 20 includes a hinge bracket 21 for mounting on the smoke collection box 2 and a transmission link 22 rotatably disposed on the hinge bracket 21 and fixedly connected to the smoke baffle body 10. The drive assembly 30 is drivingly connected to the transmission link 22 and is configured to drive the transmission link 22 to rotate, thereby causing the smoke baffle body 10 to flip. The limit assembly 40 includes a limit bracket 41 mounted on the hinge bracket 21, an electromagnet 42 disposed on the limit bracket 41, a stopper 43 slidably disposed on the limit bracket 41 and cooperating with the electromagnet 42, and a limit pin 44 rotatably disposed on the limit bracket 41 and configured to abut against the transmission link 22.

[0059] In this way, Figure 6 As shown, when the electromagnet 42 is energized in the forward direction, the block 43 slides down toward the limit pin 44 under the drive of the electromagnet 42 to prevent the limit pin 44 from rotating, so as to maintain the mechanical limit of the limit pin 44 on the transmission link 22 to achieve self-locking of the mechanism; Figure 7 As shown, when the electromagnet 42 is energized in the reverse direction, the block 43 slides away from the limit pin 44 under the drive of the electromagnet 42 to allow the limit pin 44 to rotate, thereby releasing the mechanical limit of the limit pin 44 on the transmission link 22 to achieve mechanism unlocking.

[0060] It is worth noting that, on the one hand, when the range hood is turned on to perform the fume extraction operation, the transmission link 22 rotates forward under the drive of the drive component 30 to drive the smoke baffle body 10 to flip over and open the smoke inlet 3. At this time, the electromagnet 42 can be energized in the forward direction to drive the block 43 to slide toward the limit pin 44 to block the rotation of the limit pin 44, so that the limit pin 44 mechanically limits the transmission link 22 to ensure the stable self-locking of the smoke baffle motion mechanism 1. In theory, the self-locking force can reach the strength limit of the motion mechanism, that is, the limit component 40 will not become the weak point of the smoke baffle motion mechanism 1. On the other hand, when the range hood completes its fume extraction operation and shuts down, the electromagnet 42 can be reversely energized to drive the stopper 43 to slide away from the stop pin, allowing the stop pin 44 to rotate. This allows the stop pin 44 to release the mechanical stop on the transmission link 22, thereby unlocking the smoke baffle movement mechanism 1. This ensures that the transmission link 22 can reversely rotate under the drive of the drive assembly 30 to cause the smoke baffle body 10 to flip and close the smoke inlet 3. It will be understood that the present application defines the energization of the electromagnet 42 when it drives the stopper 43 to extend toward the stop pin 44 as forward energization, and the energization of the electromagnet 42 when it drives the stopper 43 to retract and slide away from the stop pin 44 as reverse energization. Furthermore, the present application defines the rotation of the transmission link 22 when it drives the smoke baffle body 10 to flip and open the smoke inlet 3 as forward rotation, and the rotation of the transmission link 22 when it drives the smoke baffle body 10 to flip and close the smoke inlet 3 as reverse rotation.

[0061] For example, Figures 2 to 4 As shown, the transmission connecting rod 22 may include a transmission shaft 221 drivingly connected to the drive assembly 30, a crank connecting rod 222 having two ends fixedly connected to the transmission shaft 221 and the smoke deflector body 10, and a stop block 223 protruding from the crank connecting rod 222 and cooperating with the stop pin 44. Thus, when the smoke deflector body 10 is in the open state to open the smoke inlet 3, the stop pin 44 is stably located in the reverse rotation path of the stop block 223 and abuts against the stop block 223 under the obstruction of the stop block 43, thereby preventing the transmission connecting rod 22 from rotating in the reverse direction and achieving stable self-locking of the smoke deflector movement mechanism 1. In addition, when the stop block 43 slides away from the limit pin 44 to allow the limit pin 44 to rotate, the limit pin 44 can rotate under the abutment of the limit block 223 to release the mechanical limit, so that the transmission connecting rod 22 can rotate in the opposite direction under the drive of the driving assembly 30 to drive the smoke baffle body 10 to close the smoke inlet 3 and be in a closed state.

[0062] Alternatively, as Figures 5 to 7As shown, the limiting pin 44 comprises a rotating shaft 441 connected with the limiting bracket 41, a sleeving end 442 sleeved on the rotating shaft 441 and used for abutting against the stopper 43, and a limiting end 443 extending from the sleeving end 442 along the radial direction of the rotating shaft 441 and used for abutting against the limiting block 223. In this way, when the stopper 43 abuts against the sleeving end 442 to block the rotation of the limiting pin 44, the limiting end 443 extends out of the limiting bracket 41 to abut against the limiting block 223, so as to block the reverse rotation of the transmission connecting rod 22 to realize mechanical self-locking; when the stopper 43 slides away from the sleeving end 442 to allow the rotation of the limiting pin 44, the limiting end 443 will rotate under the abutment of the limiting block 223 to retract the limiting bracket 41, so as to release the mechanical limiting of the transmission connecting rod 22 and allow the reverse rotation of the transmission connecting rod 22.

[0063] Optionally, as shown in Figures 3 to 7 the rotating shaft 441 of the limiting pin 44 is perpendicular to the transmission shaft 221, so that the limiting pin 44 rotates in the tangential direction of the transmission shaft 221, preventing the limiting pin 44 from being structurally stuck with the limiting block 223 when the stopper 43 slides away, and ensuring that the smoke screen plate movement mechanism 1 can be smoothly unlocked.

[0064] Optionally, as shown in Figure 4 the crank connecting rod 222 has a first rod segment 2221 extending radially from the transmission shaft 221 and a second rod segment 2222 extending from the first rod segment 2221 in a circumferential bending manner and fixedly connected with the smoke screen plate body 10; the limiting block 223 extends from the first rod segment 2221 towards a direction away from the second rod segment 2222, facilitating the arrangement of the limiting assembly 40 at a position away from the smoke screen plate body 10 and ensuring that the limiting assembly 40 is hidden in the smoke collecting box 2.

[0065] Optionally, as shown in Figures 5 to 7As shown, the limiting bracket 41 includes a rear plate body 411 fixedly connected to the hinge bracket 21, a pair of side plates 412 extending forward from the rear plate body 411 and plugged into the rotating shaft 441, and a bottom plate body 413 extending forward from the rear plate body 411 and located below the socket end 442; the rear plate body 411 is provided with a through hole 4110 matching the stop block 43. When the block 43 is extended through the through hole 4110 under the drive of the electromagnet 42, the block 43 is located between the socket end 442 and the bottom plate body 413 to prevent the limit pin 44 from rotating, so that the limit pin 44 prevents the transmission link 22 from rotating in the opposite direction to achieve stable self-locking of the smoke baffle movement mechanism 1; and when the block 43 is retracted through the through hole 4110 under the drive of the electromagnet 42, the block 43 is disengaged from the gap between the socket end 442 and the bottom plate body 413 to allow the limit pin 44 to rotate, so that the limit pin 44 releases the mechanical limit on the transmission link 22.

[0066] Alternatively, as Figures 5 to 7 As shown, the bottom plate 413 is provided with a notch 4130 that matches the limiting end 443 of the limiting pin 44, so as to avoid the limiting end 443 and prevent structural interference between the limiting end 443 and the bottom plate 413. In other words, when the driving assembly 30 drives the transmission connecting rod 22 to rotate forward to drive the smoke shield 10 to open the smoke inlet 3, the limiting pin 44 will be in the forward rotation path of the limiting block 223, so that the limiting end 443 of the limiting pin 44 will rotate into the notch 4130 of the bottom plate 413 under the pressure of the limiting block 223, preventing the forward rotation of the transmission connecting rod 22 from being blocked, thereby ensuring that the smoke shield 10 can be opened normally.

[0067] Alternatively, as Figure 6 and Figure 7 As shown, the limiting assembly 40 further includes a reset member 45 disposed between the limiting bracket 41 and the limiting pin 44, for applying a reset force to the limiting pin 44 to cause the limiting pin 44 to extend out of the limiting bracket 41. Thus, when the limiting block 223 is disengaged from the limiting pin 44, the limiting pin 44 is reset under the action of the reset member 45, causing the limiting end portion 443 of the limiting pin 44 to extend out of the limiting bracket 41, thereby forming a gap between the limiting pin 44 and the bottom plate 413 for the stopper 43 to extend into.

[0068] Optionally, the reset member 45 is implemented as a spring, with both ends of the spring respectively connected to the rear plate 411 of the limiting bracket 41 and the sleeve end 442 of the limiting pin 44, so as to accumulate elastic potential energy when the limiting end 443 of the limiting pin 44 retracts into the limiting bracket 41, so that the limiting pin 44 can rotate relative to the limiting bracket 41 under the action of the spring, so that the limiting end 443 extends out of the limiting bracket 41 to abut against the transmission connecting rod 22. It is understandable that in other examples of the present application, the reset member 45 can also be implemented as a torsion spring or a magnetic member, as long as it can provide the required reset force, and this application will not elaborate on this.

[0069] According to the above embodiments of the present application, Figure 2 and Figure 4 As shown, the driving assembly 30 may include a push rod motor 31 and a transmission handle 32, one end of the transmission handle 32 being fixedly connected to the transmission shaft 221, and the other end of the transmission handle 32 being rotatably connected to the push rod of the push rod motor 31. Thus, when the push rod motor 31 is energized in the forward direction, the push rod of the push rod motor 31 extends to drive the transmission handle 32 to rotate the transmission shaft 221 in the reverse direction, so that the crank connecting rod 222 drives the smoke baffle body 10 to flip over and close the smoke inlet 3; and when the push rod motor 31 is energized in the reverse direction, the push rod of the push rod motor 31 retracts to drive the transmission handle 32 to rotate the transmission shaft 221 in the forward direction, so that the crank connecting rod 222 drives the smoke baffle body 10 to flip over and open the smoke inlet 3.

[0070] It is worth noting that Figure 2 As shown, each transmission connecting rod 22 may include a transmission shaft 221, two crank connecting rods 222, and a stop block 223. The two crank connecting rods 222 are respectively mounted on both ends of the transmission shaft 221 and are respectively fixedly connected to the smoke baffle body 10, and the stop block 223 is provided on one of the crank connecting rods 222. In this way, the smoke baffle motion mechanism 1 of the present application not only requires only a single drive assembly 30 to open or close the smoke baffle body 10, but also requires only a single stop assembly 40 to achieve self-locking and unlocking of the motion mechanism, which helps to simplify the structure of the smoke baffle motion mechanism 1 and reduce costs.

[0071] In addition, if Figure 2 and Figure 4 As shown, the smoke baffle movement mechanism 1 of the present application may further include a deflector 50, which is arranged on the inner wall of the smoke baffle body 10 to move the negative pressure area below the smoke baffle body 10 downward when the smoke baffle body 10 is opened, thereby helping to improve the oil fume absorption effect.

[0072] It is worth mentioning that in order to ensure that the smoke baffle movement mechanism 1 is self-locking and does not hinder its normal movement, this application requires a set of self-locking control methods for the push rod motor 31 and the electromagnet 42. Specifically, Figure 8 and Figure 11 As shown, an embodiment of the present application further provides a method for controlling a smoke baffle movement mechanism, which may include the following steps:

[0073] S100: When the range hood is turned on, the push rod motor and the electromagnet are synchronously controlled to be energized in the reverse direction, so that the transmission connecting rod rotates in the forward direction under the drive of the push rod motor, thereby driving the smoke baffle body to open the smoke inlet, and the stopper slides away from the limit pin of the limit assembly under the action of the electromagnet; and

[0074] S200: When the smoke baffle is fully opened, the electromagnet is controlled to be energized in the forward direction, so that the block slides toward the limit pin under the action of the electromagnet to achieve self-locking.

[0075] It is worth noting that when the smoke shield is fully opened, the limit block of the transmission connecting rod has already passed the limit pin, and there is also a small gap between the limit block and the limit pin. If the self-locking force of the push rod motor is insufficient, once the push rod motor is powered off, the smoke shield will fall downward under the action of gravity. Therefore, when the smoke shield is fully opened, the push rod motor cannot be powered off immediately, but needs to be powered off after a predetermined delay to ensure that the block is extended in time to achieve self-locking.

[0076] More specifically, if Figure 9 and Figure 11 As shown, step S200 in the control method of the smoke baffle movement mechanism of the present application may include the following steps:

[0077] S210: When the smoke baffle is fully opened, triggering the push rod travel switch; and

[0078] S220: After the push rod travel switch is triggered, the electromagnet is controlled to be energized in the forward direction, and the push rod motor is controlled to be de-energized after a predetermined delay.

[0079] Thus, during the period of power failure delayed by the predetermined time, the push rod motor will continue to retract the push rod to drive the smoke shield to continue opening; simultaneously, the electromagnet will drive the block to extend, thereby blocking the rotation of the stop pin. After the predetermined time, the push rod motor will be de-energized, resulting in insufficient self-locking force. At this time, the smoke shield will drive the transmission link back to a certain angle, but the transmission link will be held against the stop pin, completing the self-locking process. It is understood that since the push rod motor will continue to drive the smoke shield to continue opening during the power failure period, the smoke shield movement mechanism of the present application can be designed to allow for some movement margin, allowing the smoke shield to continue opening further after fully opening. Alternatively, the smoke shield movement mechanism of the present application can include a mechanical stop before the push rod travel switch to lock the push rod. Alternatively, a mechanical stop can be added to the hinge bracket to prevent the smoke shield from further opening. This application will not elaborate on this further.

[0080] In addition, if Figure 8 and Figure 11 As shown, the control method of the smoke baffle movement mechanism of the present application may further include the steps of:

[0081] S300: When the range hood is turned off, determining whether the stopper is extended;

[0082] S400: In response to the block being extended, controlling the push rod motor to be energized in the reverse direction, and detecting a real-time reverse current of the push rod motor;

[0083] S500: Determine whether the real-time reverse current is less than a preset current: if so, continue to increase the current of the push rod motor; if not, control the electromagnet to be energized in the reverse direction so that the block slides away from the limit pin; and

[0084] S600: In response to the block not being extended, the push rod motor is controlled to be energized in the forward direction, so that the transmission connecting rod is driven by the push rod motor to rotate in the reverse direction to drive the smoke baffle body to close the smoke inlet.

[0085] It is worth noting that when the block is extended, it indicates that the limit pin is limiting the position of the connecting rod. At this time, directly controlling the electromagnet to be energized in the reverse direction will easily cause the block to be blocked by the limit pin and difficult to retract or unable to move, thus causing unlocking failure. Therefore, the control method of the smoke shield movement mechanism of the present application first controls the push rod motor to be energized in the reverse direction when the block is extended to drive the smoke shield body to further open, releasing the pressure of the transmission connecting rod on the limit pin, and then releasing the pressure of the limit pin on the block, allowing the block to retract smoothly under the drive of the electromagnet to achieve unlocking.

[0086] Further, in the step S400, the push rod motor is powered by a ramp current, so that the push rod motor drives the smoke baffle body to force open. It can be understood that the ramp current mentioned in the present application is a linearly increasing current. When the real-time reverse current of the push rod motor is less than the preset current, it indicates that the transmission connecting rod is still pressed on the limit pin, and the current of the push rod motor needs to be continuously increased. When the real-time reverse current of the push rod motor is greater than or equal to the preset current, it indicates that the transmission connecting rod has no pressure on the limit pin, and the electromagnet can be controlled to be reversely powered to make the stop block slide off the limit pin.

[0087] Optionally, as shown in Figure 10 and Figure 11 , the step S600 in the control method of the smoke baffle movement mechanism of the present application can include the steps of:

[0088] S610: detecting the real-time forward current of the push rod motor; and

[0089] S620: determining whether the real-time forward current is less than the locked-rotor current: if yes, controlling the push rod motor to continue to be powered forward; if no, controlling the push rod motor to be powered off.

[0090] It can be understood that when the real-time forward current is less than the locked-rotor current, it indicates that the smoke baffle body is not closed in place, and the push rod motor needs to be continuously powered forward until the real-time forward current is greater than or equal to the locked-rotor current, which indicates that the smoke baffle body has been closed in place.

[0091] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0092] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application.

Claims

1. The smoke shield movement mechanism is characterized by: include: Smoke baffle body; A hinge assembly comprising a hinge bracket for mounting on the smoke collecting box and a transmission connecting rod rotatably disposed on the hinge bracket and fixedly connected to the smoke baffle body; a driving assembly, drivingly connected to the transmission connecting rod, for driving the transmission connecting rod to rotate so as to drive the smoke baffle body to flip; and a limit assembly comprising a limit bracket mounted on the hinge bracket, an electromagnet provided on the limit bracket, a stopper slidably provided on the limit bracket and cooperating with the electromagnet, and a limit pin rotatably provided on the limit bracket and used to abut against the transmission connecting rod; When the electromagnet is energized in the forward direction, the block slides toward the limit pin under the drive of the electromagnet to prevent the limit pin from rotating, thereby maintaining the mechanical limit of the transmission link by the limit pin; when the electromagnet is energized in the reverse direction, the block slides away from the limit pin under the drive of the electromagnet to allow the limit pin to rotate, thereby releasing the mechanical limit of the transmission link by the limit pin.

2. The smoke baffle movement mechanism according to claim 1, characterized in that: The transmission connecting rod includes a transmission shaft drivingly connected to the driving assembly, a crank connecting rod fixedly connected to the transmission shaft and the smoke baffle body at both ends, and a limit block protruding from the crank connecting rod and cooperating with the limit pin.

3. The smoke baffle movement mechanism according to claim 2, characterized in that: The crank connecting rod has a first rod segment extending radially from the transmission shaft and a second rod segment extending circumferentially from the first rod segment and fixedly connected to the smoke baffle body; the limit block extends from the first rod segment in a direction away from the second rod segment.

4. The smoke shield movement mechanism according to claim 2, characterized in that: The limiting pin includes a rotating shaft connected to the limiting bracket, a sleeve end portion sleeved on the rotating shaft and used to abut against the stop block, and a limiting end portion extending from the sleeve end portion along the radial direction of the rotating shaft and used to abut against the limiting block.

5. The smoke baffle movement mechanism according to claim 4, characterized in that: The rotating shaft is perpendicular to the transmission shaft.

6. The smoke baffle movement mechanism according to claim 5, characterized in that: The limiting bracket includes a rear plate body fixedly connected to the hinge bracket, a pair of side plates extending forward from the rear plate body and plugged into the rotating shaft, and a bottom plate body extending forward from the rear plate body and located below the sleeve end; the rear plate body is provided with a through hole matching the stop block.

7. The smoke baffle movement mechanism according to claim 6, characterized in that: The bottom plate body is provided with a notch matching the limiting end portion so as to avoid the limiting end portion.

8. The smoke baffle movement mechanism according to claim 6, characterized in that: The limiting assembly further includes a reset member arranged between the limiting bracket and the limiting pin; the reset member is a spring with two ends respectively connected to the rear plate and the sleeve end.

9. The smoke baffle movement mechanism according to claim 2, characterized in that: The driving assembly includes a push rod motor and a transmission handle; one end of the transmission handle is fixedly connected to the transmission shaft, and the other end of the transmission handle is rotatably connected to the push rod of the push rod motor.

10. A range hood, characterized in that: include: fan box; A smoke collecting box is arranged below the fan box and has a smoke inlet; as well as The smoke shield movement mechanism according to any one of claims 1 to 9, wherein the smoke shield movement mechanism is installed on the smoke collection box to open or close the smoke inlet.

11. A method for controlling a smoke barrier movement mechanism, characterized in that: The smoke baffle movement mechanism according to any one of claims 1 to 9 comprises the steps of: When the range hood is turned on, the push rod motor and the electromagnet are synchronously controlled to be energized in the reverse direction, so that the transmission connecting rod rotates in the forward direction under the drive of the push rod motor, driving the smoke baffle body to open the smoke inlet, and causing the stopper to slide away from the limit pin of the limit assembly under the action of the electromagnet; and When the smoke baffle body is opened to the right position, the electromagnet is controlled to be energized in the forward direction, so that the block slides toward the limit pin under the action of the electromagnet to achieve self-locking.

12. The control method of the smoke baffle movement mechanism according to claim 11, characterized in that: The step of controlling the electromagnet to be energized in the forward direction when the smoke baffle body is fully opened, so that the block slides toward the limit pin under the action of the electromagnet to achieve self-locking, comprises the following steps: When the smoke baffle body is fully opened, the push rod travel switch is triggered; and After the push rod travel switch is triggered, the electromagnet is controlled to be energized in the forward direction, and the push rod motor is controlled to be de-energized after a predetermined time delay.

13. The control method of the smoke baffle movement mechanism according to claim 11 or 12, characterized in that: Also includes the steps: When the range hood is turned off, determining whether the stopper is extended; In response to the block being extended, controlling the push rod motor to be energized in the reverse direction, and detecting the real-time reverse current of the push rod motor; Determine whether the real-time reverse current is less than the preset current: if so, continue to increase the current of the push rod motor; if not, control the electromagnet to be energized in the reverse direction so that the block slides away from the limit pin; as well as In response to the block not being extended, the push rod motor is controlled to be energized in the forward direction, so that the transmission connecting rod is driven by the push rod motor to rotate in the reverse direction to drive the smoke baffle body to close the smoke inlet.

14. The control method of the smoke baffle movement mechanism according to claim 13, characterized in that: The step of controlling the push rod motor to be energized in the forward direction in response to the block not being extended, so that the transmission connecting rod rotates in the reverse direction under the drive of the push rod motor to drive the smoke baffle body to close the smoke inlet, comprises the following steps: Detecting the real-time forward current of the push rod motor; and Determine whether the real-time forward current is less than the stall current: if so, control the push rod motor to continue to be energized in the forward direction; if not, control the push rod motor to be de-energized.

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