A control method of a range hood and a range hood

Abstract

The present disclosure relates to the technical field of kitchen appliances, and particularly relates to a control method of an extractor hood and the extractor hood. The extractor hood comprises a hood body, a smoke guide plate assembly, a driving member, a limiting member and an electromagnetic lock. Two ends of the driving member are respectively rotatably connected with the hood body and the smoke guide plate assembly. The limiting member is arranged on the smoke guide plate assembly. When the smoke guide plate assembly is closed, the limiting member cooperates with the electromagnetic lock to lock the smoke guide plate assembly at the smoke inlet of the hood body. The control method comprises: when the smoke guide plate assembly is in a closed state, obtaining a deflection angle of the smoke guide plate assembly, and performing a corresponding warning operation according to the deflection angle. Compared with the existing scheme which relies on pure mechanical limiting and has no state sensing capability, the present method can sensitively identify the slight abnormal deflection of the smoke guide plate assembly, and timely trigger the warning when the deflection angle reaches a preset threshold, and perform the corresponding warning operation, thereby improving the safety and reliability of the use process of the extractor hood.

Description

Technical Field

[0001] This disclosure relates to the field of kitchen appliance technology, and in particular to a control method for a range hood and a range hood. Background Technology

[0002] Most existing range hoods are equipped with a flip-open smoke guide plate. When the smoke guide plate is closed, it is usually locked to the range hood body through a mechanical limiting structure. However, during use, the smoke guide plate may flip open on its own under the action of gravity or negative pressure from the fan. This sudden action can easily interfere with the pots and pans on the stove, causing the pots and pans to tip over and posing safety hazards such as burns to the user.

[0003] To address the safety risks associated with the accidental opening of the smoke guide plate, existing improvement solutions mainly focus on enhancing the physical strength of the locking mechanism or adding redundant limiting structures. These improvement solutions are essentially still passive mechanical protection and lack the ability to actively identify and respond to abnormal opening of the smoke guide plate, making it difficult to meet the development requirements of modern kitchen appliances for intelligent and proactive safety protection. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this disclosure provides a control method for a range hood and a range hood.

[0005] In a first aspect, this disclosure provides a control method for a range hood, the range hood including a range hood body, a smoke guide plate assembly, a driving component, a limiting component, and an electromagnetic lock; the two ends of the driving component are respectively rotatably connected to the range hood body and the smoke guide plate assembly, the limiting component is disposed on the smoke guide plate assembly, and when the smoke guide plate assembly is closed, the limiting component cooperates with the electromagnetic lock to lock the smoke guide plate assembly at the smoke inlet of the range hood body; The control method includes: When the smoke guide plate assembly is in the closed state, the deflection angle of the smoke guide plate assembly is obtained, and a corresponding warning operation is performed based on the deflection angle.

[0006] Therefore, this control method achieves real-time dynamic monitoring of the smoke guide plate assembly's locking state by acquiring its deflection angle in real time when the assembly is closed and executing corresponding warning operations based on the deflection angle. Compared to existing solutions that rely on purely mechanical limits and lack state sensing capabilities, this method can sensitively identify minute abnormal deflections of the smoke guide plate assembly caused by weakened locking force, mechanical wear, or external disturbances, and promptly triggers a warning when the deflection angle reaches a preset threshold, executing corresponding warning operations and improving the safety and reliability of the range hood during use.

[0007] Optionally, performing the corresponding early warning operation based on the deflection angle includes: When the deflection angle is within a first preset range, a first warning operation is performed, which includes controlling the electromagnetic lock to be in a first working state. When the deflection angle is within a second preset range, a second warning operation is executed, which includes controlling the electromagnetic lock to be in a second working state. When the deflection angle is within a third preset range or the deflection angle is within the second preset range for a preset duration, a third warning operation is executed, the third warning operation including controlling the electromagnetic lock to be in a third working state; In the first operating state, the second operating state, and the third operating state, the power of the electromagnetic lock gradually increases.

[0008] Therefore, this control method divides the deflection angle into a first preset range, a second preset range, and a third preset range, and executes a first warning operation, a second warning operation, and a third warning operation accordingly, realizing graded identification and differentiated response to the abnormal deflection degree of the smoke guide plate assembly. Furthermore, the electromagnetic lock power is set in a gradient manner during the first, second, and third warning operations, allowing the electromagnetic lock to gradually increase the magnetic locking force according to the deflection angle of the smoke guide plate assembly, forming a progressive active protection. Compared to the traditional electromagnetic lock that only operates with a single power on / off switch, this control strategy can adaptively adjust the locking force output at different deflection angles. This avoids energy waste and overheating caused by high-power operation of the electromagnetic lock at low deflection angles, while ensuring sufficient locking force for safety at high deflection angles.

[0009] Optionally, the range hood further includes an audible and visual alarm; in the first warning operation, the audible and visual alarm is configured to sound intermittently, and the yellow indicator light of the audible and visual alarm is flashing; in the second warning operation and the third warning operation, the audible and visual alarm is configured to sound continuously, and the red indicator light of the audible and visual alarm is constantly on.

[0010] Therefore, in the first warning operation, the audible and visual alarm is configured to sound intermittently and the yellow indicator light flashes. In the second and third warning operations, the audible and visual alarm is configured to sound continuously and the red indicator light remains constantly on. This achieves a graded and differentiated expression of the warning signal in both auditory and visual dimensions. This allows users to intuitively and quickly distinguish the current risk level through the intermittent or continuous sound, the color of the light, and the flashing pattern, without needing to approach or look at the range hood panel, and to promptly move away from the stove, thus improving the intuitiveness of human-computer interaction and the efficiency of warning transmission.

[0011] Optionally, in the first warning operation, the speed setting of the range hood body remains unchanged; in the second warning operation, the speed setting of the range hood body is switched from high speed to low speed; and in the third warning operation, the speed setting of the range hood body is reduced to zero.

[0012] Therefore, by linking the speed setting of the range hood with the deflection angle of the smoke guide plate assembly, adaptive matching of airflow output is achieved. When the deflection angle is small and the risk is low, the existing speed setting is maintained to avoid unnecessary fan operation switching that may interfere with the user's cooking experience. When the deflection intensifies and the risk rises to a moderate level, the speed setting is proactively switched from high speed to low speed to reduce the negative pressure in the duct and weaken the force exerted by the fan on the smoke guide plate assembly. When the angle deflection is severe or abnormally persistent, the speed setting is directly reduced to zero to completely cut off the negative pressure source and eliminate safety hazards.

[0013] Optionally, in the first warning operation, a fault record is retained and stored in the recording module of the range hood body; in the second warning operation, a removable moderate fault code is generated and stored in the recording module; in the third warning operation, an unremovable severe fault code is generated and stored in the recording module.

[0014] Therefore, by classifying and recording fault information and differentiating its elimination, a severe fault code that cannot be eliminated is generated during the third early warning operation. This fault code cannot be cleared by the user through the operation interface and must be cleared by maintenance personnel. This mechanism ensures that serious abnormal events cannot be ignored or covered up by users, providing a reliable basis for maintenance personnel to accurately grasp the equipment's past abnormal history and quickly locate the root cause of the fault.

[0015] Secondly, this disclosure provides a range hood that uses the aforementioned control method for a range hood, the range hood comprising: The range hood body has a smoke inlet; The smoke guide plate assembly is rotatably connected to the smoke hood body; A driving component, the two ends of which are rotatably connected to the smoke machine body and the smoke guide plate assembly, respectively; The limiting component is connected to the smoke guide plate assembly; An electromagnetic lock is used to cooperate with the limiting member to lock the smoke guide plate assembly at the smoke inlet when the smoke guide plate assembly is in the closed state. The acquisition module is used to acquire the deflection angle of the smoke guide plate assembly when the smoke guide plate assembly is in the closed state; The control module is electrically connected to the acquisition module, the smoke machine body, and the electromagnetic lock to perform corresponding early warning operations based on the deflection angle.

[0016] Therefore, by integrating the range hood body, smoke guide plate assembly, drive components, limit components, electromagnetic lock, acquisition module and control module, the range hood has constructed a complete closed-loop control system, realizing fully automated early warning control from state perception, logical judgment to execution response.

[0017] Optionally, the driving member is configured to extend and retract axially to push the smoke guide plate assembly to rotate, the limiting member has a first locking protrusion and a second locking protrusion spaced apart, and the electromagnetic lock is disposed on the limiting member; when the smoke guide plate assembly is closed, the driving member presses against and passes over the first locking protrusion, and the electromagnetic lock has a magnetic attraction part that magnetically attracts the driving member, so that the driving member is limited and fixed between the first locking protrusion and the second locking protrusion.

[0018] Therefore, this structural design achieves dual locking of the driving component through the synergistic effect of the physical limiting action of the double locking protrusions and the magnetic adsorption of the electromagnetic lock. The first and second locking protrusions provide bidirectional limiting constraints from a mechanical perspective, preventing the driving component from disengaging from the locked position under unexpected external forces. The magnetic adsorption part of the electromagnetic lock further confines the driving component between the first and second locking protrusions with magnetic attraction force, effectively suppressing the movement or loosening of the driving component caused by mechanical vibration or minor impacts. With the dual locking mechanism working simultaneously, even if the electromagnetic lock is powered off or the limiting component wears and fails, the other constraint can still maintain the basic locking function, which helps to improve the reliability and fault tolerance of the smoke guide plate assembly's closing and locking.

[0019] Optionally, the limiting member includes a base and an elastic member. The first latching protrusion is connected to the base and is slidable longitudinally relative to the base. The electromagnetic lock is disposed on the base. The first latching protrusion and the base form a receiving cavity. The elastic member is located in the receiving cavity and is elastically compressed between the first latching protrusion and the base. The first latching protrusion has a retracted state when it is pressed by the driving member and retracts into the base, and an ejected state when the driving member presses against and passes over the first latching protrusion.

[0020] Therefore, by setting a first latching protrusion slidably connected to the base and an elastic element located within the receiving cavity, when the driving component presses against the first latching protrusion during the closing of the smoke guide plate assembly, the first latching protrusion can actively retract into the base to make way. After the driving component passes the first latching protrusion, the first latching protrusion automatically pops out under the action of the elastic element, thereby reliably confining the driving component between the first and second latching protrusions. This structure utilizes an elastic expansion and contraction mechanism to achieve smooth access during the closing of the driving component and automatic locking after it reaches its position, avoiding rigid jamming and achieving reliable locking.

[0021] Optionally, the first protrusion has a first limiting surface that conforms to the outer wall of the drive member, and the second protrusion has a second limiting surface that conforms to the outer wall of the drive member; the first limiting surface and the second limiting surface are configured to abut against both sides of the drive member when the smoke guide plate assembly is closed, so as to limit the drive member.

[0022] Therefore, the first and second limiting surfaces can achieve surface contact and fit with the outer wall of the driving component, which can not only achieve reliable limiting, but also increase the contact area, effectively avoiding local stress concentration and wear caused by point contact or line contact, and thus helping to improve service life.

[0023] Optionally, in the limiting member and the smoke guide plate assembly, one is provided with a gourd-shaped hole, and the other is provided with a connecting portion. The gourd-shaped hole includes a first hole portion and a second hole portion connected to each other. The first hole portion is larger than the second hole portion. The connecting portion includes a first connecting body connected to the limiting member and a second connecting body connected to the first connecting body. The second connecting body is spaced apart from the limiting member. The connecting portion is configured to be inserted through the first hole portion and the second hole portion and rotate about the axial direction of the first connecting body so that the second connecting body can be misaligned with the second hole portion.

[0024] Therefore, this structure can quickly assemble the limiting component and the smoke guide plate assembly without the need for additional fasteners, improving assembly efficiency and reducing production assembly costs. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0026] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating the control method for a range hood according to an embodiment of this disclosure; Figure 2 This is a schematic diagram of the smoke guide plate assembly of the range hood described in this embodiment when it is in operation; Figure 3 for Figure 2 A magnified view of a portion of point A in the middle; Figure 4 This is a schematic diagram of the smoke guide plate assembly of the range hood described in this embodiment when closed; Figure 5 for Figure 4 A magnified view of a portion of point B in the middle; Figure 6 This is a schematic diagram of the structure in which the driving component described in this embodiment is limited and fixed between the first and second locking protrusions. Figure 1 ; Figure 7 This is a schematic diagram of the structure in which the driving component described in this embodiment is limited and fixed between the first and second locking protrusions. Figure 2 ; Figure 8 This is a schematic diagram of the structure of the limiting member described in the embodiments of this disclosure. Figure 1 ; Figure 9 This is a schematic diagram of the structure of the limiting member described in the embodiments of this disclosure. Figure 2 ; Figure 10 This is a schematic diagram of the structure of the limiting member described in some embodiments; Figure 11 This is a schematic diagram of the gourd hole structure according to an embodiment of the present disclosure; Figure 12 This is a schematic diagram showing the connection between the connecting part and the gourd hole according to an embodiment of this disclosure.

[0028] in: 1. Range hood body; 11. Smoke inlet; 2. Smoke guide plate assembly; 21. Loop hole; 211. First hole section; 212. Second hole section; 3. Driving components; 4. Limiting component; 41. First locking protrusion; 411. First limiting surface; 412. First guide surface; 413. Flanged edge; 414. Limiting groove; 42. Second protrusion; 421. Second limiting surface; 43. Base; 431. Receiving groove; 44. Elastic element; 45. Connecting part; 451. First connecting body; 452. Second connecting body; 453. Window. Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0030] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0031] Most existing range hoods are equipped with a flip-open smoke guide plate. When the smoke guide plate is closed, it is usually locked to the range hood body through a mechanical limiting structure. However, during use, the smoke guide plate may flip open on its own under the action of gravity or negative pressure from the fan. This sudden action can easily interfere with the pots and pans on the stove, causing the pots and pans to tip over and posing safety hazards such as burns to the user.

[0032] To address the safety risks associated with the accidental opening of the smoke guide plate, existing improvement solutions mainly focus on enhancing the physical strength of the locking mechanism or adding redundant limiting structures. These approaches are essentially passive mechanical protection and lack the ability to actively identify and respond to abnormal opening of the smoke guide plate, making it difficult to meet the development requirements of modern kitchen appliances for intelligent and proactive safety protection.

[0033] Therefore, this application provides a control method for a range hood. By acquiring the deflection angle of the smoke guide plate assembly 2 in real time when it is closed, and executing corresponding early warning operations based on the deflection angle, the method achieves real-time dynamic monitoring of the locking state of the smoke guide plate assembly 2. Compared with existing solutions that rely on purely mechanical limiters and lack state sensing capabilities, this method can sensitively identify minute abnormal deflections of the smoke guide plate assembly 2 caused by weakening locking force, mechanical wear, or external disturbances. When the deflection angle reaches a preset threshold, it promptly triggers an early warning and executes the corresponding early warning operation, thereby improving the safety and reliability of the range hood during use.

[0034] Specifically, this embodiment provides a control method for a range hood, wherein the range hood includes a range hood body 1, a smoke guide plate assembly 2, a drive component 3, a limiting component 4, and an electromagnetic lock (not shown in the figure); the two ends of the drive component 3 are rotatably connected to the range hood body 1 and the smoke guide plate assembly 2, respectively; the limiting component 4 is disposed on the smoke guide plate assembly 2; when the smoke guide plate assembly 2 is closed, the limiting component 4 cooperates with the electromagnetic lock to lock the smoke guide plate assembly 2 at the smoke inlet 11 of the range hood body 1; The control method in this embodiment includes: When the smoke guide plate assembly 2 is in the closed state, the deflection angle of the smoke guide plate assembly 2 is obtained, and the corresponding warning operation is performed according to the deflection angle.

[0035] Through the above steps, when the smoke guide plate assembly 2 is in the closed state, this embodiment can obtain its deflection angle in real time and execute a warning operation accordingly, thereby realizing continuous monitoring of the locking state of the smoke guide plate assembly 2. This control method breaks through the technical limitations of traditional pure mechanical limit structures that rely solely on physical contact and cannot detect abnormal states. By introducing an angle detection and threshold judgment mechanism, it can accurately identify when the smoke guide plate assembly 2 deflects slightly due to weakening locking force, mechanical wear, or accidental external force, and execute corresponding warning operations according to different deflection angles. This can effectively prevent safety hazards such as pot collisions and hot oil splashes caused by the sudden opening of the smoke guide plate assembly 2.

[0036] Specifically, the corresponding early warning operations based on the deflection angle include: When the deflection angle is within the first preset range, a first warning operation is executed; when the deflection angle is within the second preset range, a second warning operation is executed; when the deflection angle is within the third preset range or the deflection angle is within the second preset range for a preset duration, a third warning operation is executed.

[0037] Through the above steps, this embodiment divides the deflection angle into a first preset range, a second preset range, and a third preset range, and executes a first warning operation, a second warning operation, and a third warning operation accordingly, realizing graded identification and differentiated response to the abnormal deflection degree of the smoke guide plate assembly 2. This mechanism can match progressively increasing warning operations according to the changing trend of the deflection angle from small to large. This ensures that different risk levels, such as slight loosening, moderate deviation, and severe deflection, can receive appropriate handling measures. At the same time, when the deflection angle remains within the second preset range for more than a preset time, the third warning operation is directly triggered. This time accumulation judgment condition can promptly upgrade the response when the risk state continues to deteriorate or remains unchanged, preventing delays in handling due to prolonged medium-risk status.

[0038] For example, in this embodiment, the first preset range of the deflection angle is: 3° < deflection angle ≤ 5°, the second preset range is: 5° < deflection angle ≤ 10°, and the third preset range is: deflection angle ≥ 15°. When the deflection angle is ≤ 3°, no operation is required. The first, second, and third preset ranges of the deflection angle can be designed and selected according to actual conditions, including but not limited to the numerical ranges shown in this embodiment. Furthermore, in this embodiment, when the deflection angle remains within the second preset range for more than a preset duration, a third warning operation is directly triggered. This preset duration is set to three seconds in this embodiment; that is, if the deflection angle remains within the second preset range for more than three seconds without recovering, the third warning operation is directly triggered, escalating the warning operation.

[0039] Specifically, in the first warning operation, the electromagnetic lock is controlled to be in the first working state; in the second warning operation, the electromagnetic lock is controlled to be in the second working state; in the third warning operation, the electromagnetic lock is controlled to be in the third working state; in the first working state, the second working state, and the third working state, the power of the electromagnetic lock gradually increases.

[0040] Specifically, when the deflection angle of the smoke guide plate assembly 2 is small, the electromagnetic lock operates at a low power, which can provide appropriate magnetic locking force compensation to suppress slight loosening and avoid unnecessary energy consumption; when the deflection angle of the smoke guide plate assembly 2 becomes larger, the power of the electromagnetic lock is adaptively increased, so that the electromagnetic lock can counteract the outward deflection trend of the smoke guide plate assembly 2 with a stronger magnetic locking force to prevent the abnormal state from continuing to deteriorate.

[0041] This embodiment uses a gradient setting for the electromagnetic lock's power, allowing the electromagnetic lock to gradually increase its magnetic locking force based on the deflection angle of the smoke guide plate assembly 2, thus forming a progressive active protection. Compared to traditional electromagnetic locks that operate with only a single power on / off state, this control strategy can adaptively adjust the locking force output at different deflection angles. This avoids energy waste and overheating caused by high-power operation of the electromagnetic lock at low deflection angles, while ensuring sufficient locking force for safety at high deflection angles.

[0042] Optionally, the range hood also includes an audible and visual alarm; in the first warning operation, the audible and visual alarm is configured to sound intermittently, and the yellow indicator light of the audible and visual alarm is flashing; in the second and third warning operations, the audible and visual alarm is configured to sound continuously, and the red indicator light of the audible and visual alarm is constantly on.

[0043] Therefore, in this embodiment, the audible and visual alarm is configured to emit intermittent sounds and flash yellow indicator lights in the first warning operation, and to emit continuous sounds and keep red indicator lights on in the second and third warning operations. This achieves graded and differentiated expression of the warning signal in both auditory and visual dimensions. This allows users to intuitively and quickly distinguish the current risk level through the intermittent or continuous sound, the color of the light, and the flashing pattern, without needing to approach or look at the range hood panel, and to promptly move away from the stove, improving the intuitiveness of human-computer interaction and the efficiency of warning transmission.

[0044] Optionally, the control method for the range hood in this embodiment further includes: In the first warning operation, the speed setting of the range hood body 1 is kept unchanged; In the second warning operation, the speed setting of the range hood body 1 is switched from high speed to low speed. In the third warning operation, the speed setting of the range hood body 1 is reduced to zero.

[0045] Therefore, by linking the speed setting of the range hood body 1 with the deflection angle of the smoke guide plate assembly 2, adaptive matching of airflow output is achieved. When the deflection angle is small and the risk is low, the existing speed setting is maintained to avoid unnecessary fan operation switching that may interfere with the user's cooking experience. When the deflection intensifies and the risk rises to a moderate level, the speed setting is actively switched from high speed to low speed to reduce the force exerted by the fan on the smoke guide plate assembly 2 by reducing the negative pressure in the air duct. When the angle deflection is severe or abnormally persistent, the speed setting is directly reduced to zero to completely cut off the negative pressure source and eliminate safety hazards.

[0046] Understandably, when the smoke guide plate assembly 2 is closed, there is still a 2cm to 3cm gap between the smoke guide plate assembly 2 and the smoke inlet 11 of the range hood body 1. This gap allows the range hood to maintain normal smoke adsorption even when the smoke guide plate assembly 2 is fully closed, ensuring that cooking fumes can be effectively drawn out through this gap. This also means that the negative pressure generated by the fan in the range hood body 1 will affect the deflection trend of the smoke guide plate assembly 2. When the deflection angle of the smoke guide plate assembly 2 is small (within the first preset range), the existing speed setting remains unchanged; when the deflection angle of the smoke guide plate assembly 2 is large (within the second preset range), the speed setting of the range hood body 1 is switched from high speed to low speed to weaken the suction effect of the negative pressure on the smoke guide plate; when the smoke guide plate assembly 2 deflects severely (within the third preset range), the machine stops directly, that is, the speed setting of the range hood body 1 is reduced to zero to improve safety.

[0047] Optionally, the control method for the range hood in this embodiment further includes: In the first warning operation, the fault record is retained and stored in the recording module of the smoke machine body; in the second warning operation, a removable moderate fault code is generated and stored in the recording module; in the third warning operation, an unremovable severe fault code is generated and stored in the recording module.

[0048] In other words, when the deflection angle of the smoke guide plate assembly 2 is within the first preset range, the deflection angle is small and does not pose a significant safety risk. Therefore, in the first warning operation, it is sufficient to only retain the fault record in the recording module of the range hood itself. This fault record can be cleared upon the next power-on restart. When the deflection angle of the smoke guide plate assembly 2 is within the second preset range, its deflection degree has significantly increased, posing a moderate level of safety risk. The smoke guide plate may deflect further or even flip open on its own. Therefore, in the second warning operation, in addition to implementing corresponding active intervention measures such as audible and visual alarms, electromagnetic lock power increase, and speed reduction, a removable moderate fault code is also generated in the recording module. This moderate fault code allows the user to delete it themselves through the operation interface. This allows the user to resume use independently after the intermittent abnormality is resolved without needing to report it for repair, and the generation of the fault code also reminds the user that the abnormality has exceeded the minor range and requires attention. Similarly, when the deflection angle of the smoke guide plate assembly 2 reaches the third preset range, or when the deflection angle remains within the second preset range for a preset duration, it indicates that the smoke guide plate has undergone severe deflection or the abnormal state continues to worsen, posing a high safety risk. At this time, an unremovable severe fault code is generated in the third warning operation. This fault code cannot be manually cleared by the user through the operation interface and must be cleared by professional maintenance personnel.

[0049] In addition, this embodiment also provides a range hood, such as Figures 2 to 12As shown, the range hood utilizes the aforementioned control method. The range hood includes a main body 1, a smoke guide plate assembly 2, a drive component 3, a limiting component 4, an electromagnetic lock (not shown), an acquisition module (not shown), and a control module (not shown). The main body 1 has a smoke inlet 11, and the smoke guide plate assembly 2 is rotatably connected to the main body 1. The two ends of the drive component 3 are rotatably connected to the main body 1 and the smoke guide plate assembly 2, respectively. The drive component 3 is configured to extend and retract axially to push the smoke guide plate assembly 2 to rotate. The limiting component 4 is connected to the smoke guide plate assembly 2. The electromagnetic lock, when the smoke guide plate assembly 2 is in a closed state, cooperates with the limiting component 4 to engage the drive component 3, locking the smoke guide plate assembly 2 at the smoke inlet 11. The acquisition module acquires the deflection angle of the smoke guide plate assembly 2 when it is in a closed state. The control module is electrically connected to the acquisition module, the main body 1, and the electromagnetic lock to perform corresponding warning operations based on the deflection angle.

[0050] In this embodiment, the driving component 3 is a hydraulic or electric telescopic rod with axial telescopic function, which is common in the field. It can be set on both sides of the smoke inlet 11. One end of the driving component 3 is rotatably connected to the smoke guide plate assembly 2, and the other end of the driving component 3 is rotatably connected to the smoke machine body 1. The acquisition module can specifically include at least one of an angle Hall sensor and a push rod stroke sensor. The angle Hall sensor can be set at the hinge axis between the smoke guide plate assembly 2 and the smoke machine body 1 to collect the deflection angle of the smoke guide plate assembly 2 in real time. The push rod stroke sensor can be embedded in the end of the driving component 3 to monitor the extension and retraction stroke of the push rod in real time, so as to indirectly reflect the deflection of the smoke guide plate assembly 2.

[0051] Therefore, this range hood integrates the hood body 1, smoke guide plate assembly 2, drive component 3, limiting component 4, electromagnetic lock, acquisition module, and control module to construct a complete closed-loop control system. The drive component 3 drives the smoke guide plate assembly 2 to rotate and open relative to the hood body 1 via axial extension and retraction. When the smoke guide plate is closed, the electromagnetic lock cooperates with the limiting component 4 to lock the drive component 3, ensuring that the smoke guide plate assembly 2 reliably covers the smoke inlet 11. The acquisition module monitors the deflection angle of the smoke guide plate in the closed state in real time, and the control module executes graded early warning operations based on this deflection angle, realizing fully automated early warning control from state perception and logical judgment to execution response.

[0052] Furthermore, the limiting member 4 has a first locking protrusion 41 and a second locking protrusion 42 spaced apart, and an electromagnetic lock is disposed on the limiting member 4; when the smoke guide plate assembly 2 is closed, the driving member 3 presses against and passes over the first locking protrusion 41, and the electromagnetic lock has a magnetic attraction part that magnetically attracts the driving member 3, so that the driving member 3 is limited and fixed between the first locking protrusion 41 and the second locking protrusion 42.

[0053] That is, such as Figures 3 to 8As shown, the limiting member 4 has a first locking protrusion 41 and a second locking protrusion 42 spaced apart. When the smoke guide plate assembly 2 is closed, the driving member 3 gradually retracts, causing the smoke guide plate assembly 2 to rotate towards the smoke inlet 11. Simultaneously, since the limiting member 4 is located on the smoke guide plate assembly 2, it moves synchronously as the smoke guide plate assembly 2 rotates. As the smoke guide plate assembly 2 gradually closes, the driving member 3 can press against and pass over the first locking protrusion 41, thus limiting and fixing the driving member 3 between the first locking protrusion 41 and the second locking protrusion 42. Figure 5 and Figure 6 As shown, when the driving member 3 presses against and passes the first latching protrusion 41, the magnetic attraction part of the electromagnetic lock magnetically attracts the driving member 3, so that the driving member 3 is further firmly restricted between the first latching protrusion 41 and the second latching protrusion 42, thereby achieving reliable closing and limiting of the smoke guide plate assembly 2.

[0054] Conversely, when the smoke guide plate assembly 2 is opened, the power supply to the electromagnetic lock is first disconnected, causing the magnetic attraction between the magnetic part of the electromagnetic lock and the driving component 3 to disengage. Then, the driving component 3 is controlled to gradually extend and rotate the smoke guide plate assembly 2 towards the opening of the smoke inlet 11. As the smoke guide plate assembly 2 gradually opens, the driving component 3, which is stuck between the first locking protrusion 41 and the second locking protrusion 42, will press against the first locking protrusion 41 and move past it in the opposite direction, causing the driving component 3 to disengage from between the first locking protrusion 41 and the second locking protrusion 42, thus opening the smoke guide plate assembly 2. This structural design achieves dual locking of the driving component 3 through the synergistic effect of the physical limiting of the double locking protrusions and the magnetic attraction of the electromagnetic lock. The first locking protrusion 41 and the second locking protrusion 42 provide bidirectional limiting constraints from a mechanical perspective, preventing the drive component 3 from disengaging from the locked position under unexpected external forces. The magnetic attraction part of the electromagnetic lock further confines the drive component 3 between the first locking protrusion 41 and the second locking protrusion 42 with magnetic attraction, effectively suppressing the drive component from shifting or loosening due to mechanical vibration or minor impacts. With the dual locking mechanism working simultaneously, even if the electromagnetic lock is powered off or the limiting component 4 wears and fails, the other constraint can still maintain the basic locking function, thus improving the reliability and fault tolerance of the smoke guide plate assembly 2 when it closes and locks.

[0055] It is understood that the electromagnetic lock in this embodiment is an existing component in the field. The driving component 3 in this embodiment has a metal body. When the electromagnetic lock is energized, its magnetic attraction part can generate a magnetic attraction force, which can form a magnetic attraction with the surface of the driving component 3 body, so as to further confine the driving component 3 between the first latching protrusion 41 and the second latching protrusion 42. Moreover, the greater the power of the electromagnetic lock (that is, the greater the supply current), the stronger the magnetic attraction force it generates. The specific structural composition of the electromagnetic lock can be referred to the prior art, and this embodiment will not elaborate on it further.

[0056] In some embodiments, the limiting member 4 includes a base 43, and a first latching protrusion 41 and a second latching protrusion 42 are integrally formed on the base 43. That is, as shown in the figure... Figure 8 As shown, the first locking protrusion 41 and the second locking protrusion 42 are integrally formed on the base 43. When the smoke guide plate assembly 2 is closed, the driving member 3 makes hard contact with the first locking protrusion 41 and passes over the first locking protrusion 41. The first locking protrusion 41 and the second locking protrusion 42 are integrally formed on the base 43, which is convenient for mass production.

[0057] Furthermore, in some embodiments, the first latching protrusion 41 can be elastically telescopically moved so that when the smoke guide plate assembly 2 is closed, the driving member 3 can more easily pass over the first latching protrusion 41 and then engage between the first latching protrusion 41 and the second latching protrusion 42. Specifically, as shown in the figure... Figure 10 As shown, the limiting member 4 includes a base 43 and an elastic member 44. The first locking protrusion 41 is connected to the base 43 and can slide longitudinally relative to the base 43. An electromagnetic lock is disposed on the base 43. The first locking protrusion 41 and the base 43 surround to form a receiving cavity. The elastic member 44 is located in the receiving cavity and is elastically compressed between the first locking protrusion 41 and the base 43. The first locking protrusion 41 has a retracted state when it is pressed by the driving member 3 and retracts into the base 43, and an ejected state when the driving member 3 presses against and passes over the first locking protrusion 41.

[0058] When the smoke guide plate assembly 2 is closed, the driving member 3 presses against the first locking protrusion 41, compressing the first locking protrusion 41 back into the base 43. Once the driving member 3 passes the first locking protrusion 41, under the elastic action of the elastic member 44, the first locking protrusion 41 pops out from the base 43, allowing the driving member 3 to be limited and clamped between the first locking protrusion 41 and the second locking protrusion 42. When the smoke guide plate assembly 2 is opened, the driving member 3 presses against the first locking protrusion 41, compressing the first locking protrusion 41 back into the base 43. The first locking protrusion 41 pops out again only after the driving member 3 has disengaged from between the first locking protrusion 41 and the second locking protrusion 42.

[0059] Therefore, by setting a first locking protrusion 41 slidably connected to the base 43 and an elastic element 44 located in the receiving cavity, when the driving member 3 presses against the first locking protrusion 41 during the closing of the smoke guide plate assembly 2, the first locking protrusion 41 can actively retract into the base 43 to make way. After the driving member 3 passes the first locking protrusion 41, the first locking protrusion 41 automatically pops out under the action of the elastic element 44, thereby reliably limiting the driving member 3 between the first locking protrusion 41 and the second locking protrusion 42. This structure uses an elastic telescopic mechanism to achieve smooth access when the driving member 3 closes and automatic locking after it is in place, which avoids rigid jamming and achieves reliable locking.

[0060] Based on this, the base 43 is recessed to form a receiving groove 431 with an opening on one side. The first locking protrusion 41 is slidably connected to the receiving groove 431 and forms a receiving cavity with the receiving groove 431. The opening extends inward in the circumferential direction with a limiting edge. The first locking protrusion 41 is provided with a flange 413 in the circumferential direction that can abut against the limiting edge when it is in the popped-out state. Thus, by providing a receiving groove 431 on the base 43, the first locking protrusion 41 is slidably connected to the receiving groove 431, and a flange 413 is provided in the circumferential direction of the first locking protrusion 41. When the first locking protrusion 41 is popped out under the action of the elastic member 44, the flange 413 can abut against the limiting edge of the opening of the receiving groove 431. This can effectively prevent the first locking protrusion 41 from completely coming out of the base 43, ensuring that the extension and retraction stroke of the first locking protrusion 41 is always limited within a reliable range, and avoiding problems such as locking failure due to accidental dislodgement of the first locking protrusion 41.

[0061] Furthermore, a limiting groove 414 is provided on the side of the first latching protrusion 41 facing the bottom of the receiving groove 431. One end of the elastic member 44 abuts against the limiting groove 414, and the other end of the elastic member 44 abuts against the receiving groove 431. The shape and size of the limiting groove 414 match one end of the elastic member 44. That is, as shown... Figure 10 As shown, in this embodiment, a limiting groove 414 is provided at the bottom of the first locking protrusion 41, and the two ends of the elastic member 44 abut against the limiting groove 414 and the receiving groove 431 respectively. The shape and size of the limiting groove 414 are adapted to the shape and size of the end of the elastic member 44 that extends into the limiting groove 414 and abuts against it, so as to prevent the elastic member 44 from sliding and shifting. This achieves reliable limiting of the elastic member 44, so as to ensure that the compression and rebound of the elastic member 44 always proceed in the predetermined direction, thereby improving the smoothness and consistency of the extension and retraction of the first locking protrusion 41.

[0062] Optionally, in some embodiments, the first latching protrusion 41 has a first limiting surface 411 that conforms to the outer wall of the driving member 3, and the second latching protrusion 42 has a second limiting surface 421 that conforms to the outer wall of the driving member 3; the first limiting surface 411 and the second limiting surface 421 are configured to abut against both sides of the driving member 3 when the smoke guide plate assembly 2 is closed, so as to limit the driving member 3. In this embodiment, as Figure 7 As shown, both the first limiting surface 411 and the second limiting surface 421 are set as arc-shaped surfaces that fit against the outer wall of the driving component 3, which can achieve surface contact with the outer wall of the driving component 3. This not only achieves reliable limiting but also increases the contact area, effectively avoiding local stress concentration and wear caused by point contact or line contact, and thus improving service life.

[0063] Optionally, in some embodiments, the first latching protrusion 41 has a first guide surface 412, which is transitionally connected to the first limiting surface 411. The first guide surface 412 is configured to press against the driving member 3 to guide the driving member 3 to slide towards the first limiting surface 411. Thus, by providing the first guide surface 412 on the first latching protrusion 41 that is transitionally connected to the first limiting surface 411, the driving member 3 can smoothly slide towards the first limiting surface 411 along the first guide surface 412 when pressing against the first latching protrusion 41 during the closing process. This avoids rigid impact or jamming between the driving member 3 and the first latching protrusion 41, reduces the driving force required for the driving member 3 to pass over the first latching protrusion 41, and reduces wear on the contact parts, thereby improving the smoothness of the driving member 3 passing over the first latching protrusion 41.

[0064] Optionally, in some embodiments, a rounded corner is formed at the connection between the first guide surface 412 and the first limiting surface 411. Thus, by providing a rounded corner at the connection between the first guide surface 412 and the first limiting surface 411, the sharp edges at their junction are effectively eliminated, allowing the drive member 3 to smoothly transition along the first guide surface 412 towards the first limiting surface 411. This avoids localized wear or jamming caused by stress concentration, further reducing the frictional resistance between the drive member 3 and the first locking protrusion 41, and improving the smoothness of the locking action and the service life of the parts.

[0065] In some embodiments, the limiting member 4 and the smoke guide plate assembly 2 are provided with a gourd hole 21 and a connecting portion 45. The gourd hole 21 includes a first hole portion 211 and a second hole portion 212 connected to each other. The first hole portion 211 is larger than the second hole portion 212. The connecting portion 45 includes a first connecting body 451 connected to the limiting member 4 and a second connecting body 452 connected to the first connecting body 451. The second connecting body 452 is spaced apart from the limiting member 4. The connecting portion 45 is configured to be inserted through the first hole portion 211 and the second hole portion 212 and rotate about the axis of the first connecting body 451 so that the second connecting body 452 can be misaligned with the second hole portion 212.

[0066] Specifically, such as Figure 11 and Figure 12 As shown, the smoke guide plate assembly 2 of this embodiment is provided with a gourd-shaped hole 21. The gourd-shaped hole 21 includes a first hole portion 211 and a second hole portion 212 with different diameters. The connecting portion 45 includes a first connecting body 451 and a second connecting body 452 connected thereto. In this embodiment, the first connecting body 451 is a cylindrical structure adapted to the shape and size of the first hole portion 211, and the second connecting body 452 is a support plate structure adapted to the shape and size of the second hole portion 212.

[0067] During assembly, the first connecting body 451 is aligned with the first hole 211, and the second connecting body 452 is aligned with the second hole 212, so that the connecting part 45 can be inserted into the gourd-shaped hole 21 formed by the first hole 211 and the second hole 212. After the second hole 212 passes through, the entire limiting member 4 is rotated, causing the connecting part 45 to rotate around the axis of the first connecting body 451 until the second connecting body 452 and the second hole 212 are misaligned, forming a misaligned snap-fit. This structure allows for rapid assembly of the limiting member 4 and the smoke guide plate assembly 2 without the need for additional fasteners (such as screws), improving assembly efficiency and reducing production assembly costs.

[0068] Optionally, the limiting component 4 also has a window 453, such as Figure 9 As shown, the window 453 is positioned directly opposite the second connector 452, allowing the operator to directly observe the position of the second connector 452 through the window 453 during assembly or disassembly. This facilitates confirmation of whether the second connector 452 has been rotated to the locking position that is misaligned with the second hole 212, improving the convenience and visibility of assembly and disassembly, and avoiding problems such as incomplete assembly or difficult disassembly caused by blind operation.

[0069] In addition, in some embodiments, the range hood may also include a cavity temperature sensor and a duct negative pressure detection module, which are electrically connected to the control module. The cavity temperature sensor is fixed at the smoke inlet 11 to detect the ambient temperature of the cooking cavity; the duct negative pressure detection module is located inside the duct of the range hood body 1 to collect duct negative pressure data. When the ambient temperature of the cooking cavity detected by the cavity temperature sensor exceeds 80°C, or the duct negative pressure data collected by the duct negative pressure detection module exceeds a preset safety value, the control module directly executes a second warning operation to improve the overall safety performance of the range hood body 1.

[0070] The specific usage process of the range hood in this embodiment is as follows: After the range hood body 1 is powered on, the control module (main control MCU) first performs a system self-test to complete the initialization configuration of each sensor and execution module. Subsequently, the angle Hall sensor, push rod stroke sensor, cavity temperature sensor, and duct negative pressure detection module collect data on the rotation angle of the smoke guide plate, the stroke of the hydraulic push rod, the temperature of the cooking cavity, and the duct negative pressure in real time at a fixed period of 200ms. The collected signals are processed by a filtering circuit to reduce noise and then synchronously transmitted to the control module for analysis and processing.

[0071] When the user manually closes the smoke guide plate, the drive component 3 moves synchronously towards the limiting component 4 as the smoke guide plate assembly 2 flips. The control module compares the collected angle and stroke data with the preset closing threshold in real time. When the closing angle of the smoke guide plate assembly 2 reaches 0°±1°, and the drive component 3 is fully engaged between the first locking protrusion 41 and the second locking protrusion 42 of the limiting component 4, it is determined that the smoke guide plate assembly 2 is mechanically closed. The control module then outputs a drive signal to control the electromagnetic lock to be energized and locked, forming a dual anti-disengagement structure combining mechanical limiting and electro-electromagnetic locking. The smoke guide plate assembly 2 officially enters the closed state. In the closed state, various sensors maintain periodic inspections, and the control module continuously monitors the deflection angle of the smoke guide plate assembly 2 in real time. Once an abnormality is detected, the aforementioned graded warning operation is executed.

[0072] When a user needs to open the smoke guide plate assembly 2, the electromagnetic lock can only be unlocked after pressing the dedicated unlock button on the control panel of the range hood body 1, and after the control module verifies that the range hood body 1 is in a stopped state, the cavity temperature has dropped to a safe value, and the negative pressure in the air duct has been cleared. At this time, the user can manually open the smoke guide plate assembly 2. After unlocking, the system will automatically reset and re-enter the real-time status monitoring mode to ensure safe operation in subsequent use cycles.

[0073] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0074] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a range hood, characterized in that, The range hood includes a range hood body, a smoke guide plate assembly, a drive component, a limiting component, and an electromagnetic lock; the two ends of the drive component are rotatably connected to the range hood body and the smoke guide plate assembly, respectively; the limiting component is disposed on the smoke guide plate assembly; when the smoke guide plate assembly is closed, the limiting component cooperates with the electromagnetic lock to lock the smoke guide plate assembly at the smoke inlet of the range hood body. The control method includes: When the smoke guide plate assembly is in the closed state, the deflection angle of the smoke guide plate assembly is obtained, and a corresponding warning operation is performed based on the deflection angle; the execution of the corresponding warning operation based on the deflection angle includes: When the deflection angle is within a first preset range, a first warning operation is performed, which includes controlling the electromagnetic lock to be in a first working state. When the deflection angle is within a second preset range, a second warning operation is executed, which includes controlling the electromagnetic lock to be in a second working state. When the deflection angle is within a third preset range or the deflection angle is within the second preset range for a preset duration, a third warning operation is executed, the third warning operation including controlling the electromagnetic lock to be in a third working state; In the first operating state, the second operating state, and the third operating state, the power of the electromagnetic lock gradually increases.

2. The control method for a range hood according to claim 1, characterized in that, The range hood also includes an audible and visual alarm; In the first warning operation, the audible and visual alarm is configured to sound intermittently, and the yellow indicator light of the audible and visual alarm is flashing. In the second and third warning operations, the audible and visual alarm is configured to emit a continuous sound, and the red indicator light of the audible and visual alarm is constantly on.

3. The control method for a range hood according to claim 1, characterized in that, In the first warning operation, the speed setting of the range hood body remains unchanged; In the second warning operation, the speed setting of the range hood body is switched from high speed to low speed. In the third warning operation, the speed setting of the range hood body is reduced to zero.

4. The control method for a range hood according to claim 1, characterized in that, In the first early warning operation, the fault record is retained and stored in the recording module of the smoke hood body; In the second early warning operation, a revocable moderate fault code is generated and stored in the recording module; In the third early warning operation, an unremovable severe fault code is generated and stored in the recording module.

5. A range hood, characterized in that, The control method for the range hood according to any one of claims 1-4, the range hood comprising: The range hood body has a smoke inlet; The smoke guide plate assembly is rotatably connected to the smoke hood body; A driving component, the two ends of which are rotatably connected to the smoke machine body and the smoke guide plate assembly, respectively; The limiting component is connected to the smoke guide plate assembly; An electromagnetic lock is used to cooperate with the limiting member to lock the smoke guide plate assembly at the smoke inlet when the smoke guide plate assembly is in the closed state. The acquisition module is used to acquire the deflection angle of the smoke guide plate assembly when the smoke guide plate assembly is in the closed state; The control module is electrically connected to the acquisition module, the smoke machine body, and the electromagnetic lock to perform corresponding early warning operations based on the deflection angle.

6. The range hood according to claim 5, characterized in that, The driving member is configured to extend and retract axially to push the smoke guide plate assembly to rotate. The limiting member has a first locking protrusion and a second locking protrusion spaced apart. The electromagnetic lock is disposed on the limiting member. When the smoke guide plate assembly is closed, the driving member presses against and passes over the first locking protrusion. The electromagnetic lock has a magnetic attraction part that magnetically attracts the driving member, so that the driving member is limited and fixed between the first locking protrusion and the second locking protrusion.

7. The range hood according to claim 6, characterized in that, The limiting member includes a base and an elastic member. The first latching protrusion is connected to the base and is slidable longitudinally relative to the base. The electromagnetic lock is disposed on the base. The first latching protrusion and the base form a receiving cavity. The elastic member is located in the receiving cavity and is elastically compressed between the first latching protrusion and the base. The first latching protrusion has a retracted state when it is pressed by the driving member and retracts into the base, and an ejected state when the driving member presses against and passes over the first latching protrusion.

8. The range hood according to claim 6, characterized in that, The first protrusion has a first limiting surface that fits against the outer wall of the drive member, and the second protrusion has a second limiting surface that fits against the outer wall of the drive member; the first limiting surface and the second limiting surface are configured to abut against both sides of the drive member when the smoke guide plate assembly is closed, so as to limit the drive member.

9. The range hood according to any one of claims 5-8, characterized in that, Of the limiting member and the smoke guide plate assembly, one is provided with a gourd-shaped hole, and the other is provided with a connecting portion. The gourd-shaped hole includes a first hole portion and a second hole portion connected to each other. The first hole portion is larger than the second hole portion. The connecting portion includes a first connecting body connected to the limiting member and a second connecting body connected to the first connecting body. The second connecting body is spaced apart from the limiting member. The connecting portion is configured to be inserted through the first hole portion and the second hole portion and rotate about the axial direction of the first connecting body so that the second connecting body can be misaligned with the second hole portion.

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