Method and device for detecting liquid level in a range hood

Abstract

The present disclosure relates to a method and device for detecting liquid level in a range hood. The method can include: obtaining a historical liquid level value of an oil cup; obtaining an operating state of a fan and a fan opening duration; in the case that the operating state is a closed state, determining an oil cup liquid level state of the oil cup according to a comparison relationship between the historical liquid level value and a preset liquid level threshold; in the case that the oil cup liquid level state represents that the oil cup has a risk of being full of oil and the fan opening duration is greater than a predetermined duration, performing liquid level detection on the oil cup and recording a liquid level value of the oil cup obtained by the liquid level detection. According to the technical solution provided by the present disclosure, by judging whether to perform liquid level detection in the closed state of the fan, the frequent calling of the sensor can be effectively reduced, and the risk of the sensor being contaminated by oil can be reduced. At the same time, based on the fan opening duration and the historical liquid level value, the timing and frequency of detection can be reasonably controlled, unnecessary detection operations can be reduced, and the service life of the sensor can be prolonged.

Description

Technical Field

[0001] This disclosure relates to the field of household appliance technology, and in particular to a method and device for detecting liquid level in a range hood. Background Technology

[0002] As an essential appliance in the home kitchen, the range hood uses its fan to draw in cooking fumes and separates the grease through a filter, collecting it in an oil cup. However, because grease accumulates slowly in the oil cup, and the cup is usually hidden, users often neglect to clean it, leading to an excessively high oil level or even overflow. Traditional solutions sometimes estimate the oil level based on operating time. However, due to differences in cooking habits, fume production, and cooking frequency, this method is prone to error and fails to accurately reflect the actual oil level.

[0003] Furthermore, some existing technical solutions attempt to detect the liquid level in oil cups using ultrasonic or laser rangefinder sensors. However, due to the large amount of oil present in the working environment of range hoods, these sensors are easily contaminated by oil, leading to inaccurate detection or sensor failure. These problems limit the application of related technologies in actual products. Therefore, existing technologies cannot meet the requirement of avoiding sensor contamination while ensuring detection accuracy. Summary of the Invention

[0004] This disclosure provides a method and apparatus for detecting liquid level in a range hood, thereby at least solving the problem in related technologies of how to accurately detect the liquid level in the oil cup while avoiding sensor contamination by oil. The technical solution of this disclosure is as follows:

[0005] According to a first aspect of the present disclosure, a method for detecting liquid level in a range hood is provided, the range hood being equipped with a fan and an oil cup, including:

[0006] Obtain the historical liquid level value of the oil cup; the historical liquid level value refers to the liquid level value of the oil cup during the last liquid level detection;

[0007] The operating status and operating duration of the fan are obtained; the operating duration of the fan represents the cumulative operating time of the fan since the last liquid level detection.

[0008] When the operating state is off, the oil cup level is determined based on the comparison between the historical liquid level value and the preset liquid level threshold.

[0009] When the oil cup level indicates a risk of the oil cup becoming full and the fan operation time exceeds a predetermined time, the oil cup level is detected and the detected oil cup level value is recorded.

[0010] According to a second aspect of the present disclosure, a liquid level detection device for a range hood is provided. The range hood is equipped with a moving structure, an oil-proof structure, and a sensor. The range hood adjusts the positional relationship between the oil-proof structure and the sensor through the moving structure. The positional relationship includes the sensor being inside the oil-proof structure and the sensor being outside the oil-proof structure.

[0011] The step of detecting the liquid level in the oil cup and recording the liquid level value obtained from the detection includes:

[0012] Control the movement of the motion structure to adjust it from the position of the sensor inside the oil-proof structure to the position of the sensor outside the oil-proof structure;

[0013] The sensor is controlled to detect the oil cup and record the liquid level value of the oil cup obtained by the liquid level detection.

[0014] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0015] By obtaining historical oil level values ​​from the oil cup as a reference, analysis and judgment can be made based on previously detected data, making the oil level detection more intelligent and reducing the frequent use of sensors. By obtaining the operating status and operating duration of the fan, the usage of the range hood can be monitored, indirectly inferring the degree of oil accumulation in the oil cup. This allows for a more scientific scheduling of oil level detection, optimizing the overall operating efficiency of the range hood.

[0016] Furthermore, when the fan is off, the oil cup level is determined by comparing historical liquid level values ​​with preset liquid level thresholds. This avoids detecting the oil cup level while the fan is running, thus reducing the risk of the sensor being contaminated by oil and allowing the sensor to work stably for a long time in the range hood environment. When the oil cup level indicates a risk of overflowing and the fan has been running for longer than the preset time, liquid level detection is performed to keep the oil cup level within a controllable range and avoid the risk of overflow due to overfilling.

[0017] In summary, the technical solution provided in this disclosure can achieve intelligent and efficient liquid level detection, rationally arrange detection timing, reduce frequent sensor calls, extend sensor lifespan, reduce the impact of oil on the sensor, and effectively prevent oil cup overflow, thereby improving the safety and operating efficiency of the range hood.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure, and are not intended to unduly limit this disclosure.

[0020] Figure 1 This is a schematic diagram illustrating an application environment according to an exemplary embodiment.

[0021] Figure 2 This is a flowchart illustrating a liquid level detection method in a range hood according to an exemplary embodiment.

[0022] Figure 3 This is a structural diagram of a liquid level detection device in a range hood according to an exemplary embodiment, and a flowchart of the upper computer implementing transmission and reception based on the automotive open system architecture.

[0023] Figure 4 This is a structural diagram of a liquid level detection device in a range hood according to an exemplary embodiment, and a flowchart of the upper computer implementing transmission and reception based on the automotive open system architecture.

[0024] Figure 5 This is a structural diagram of a liquid level detection device in a range hood according to an exemplary embodiment.

[0025] Figure 6 This is a structural diagram of a liquid level detection device in a range hood according to an exemplary embodiment.

[0026] Figure 7 This is a block diagram of a liquid level detection device in a range hood according to an exemplary embodiment. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0028] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0029] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating an application environment according to an exemplary embodiment, such as... Figure 1 As shown, the application environment may include a range hood 10 and a liquid level detection device 20.

[0030] The range hood 10 may be equipped with a fan 101 and an oil cup 103. The fan 101 is used to draw in cooking fumes and separate the grease through a filter, collecting it in the oil cup 103. The oil cup 103 is used to store the grease separated from the cooking fumes, preventing the fumes from spreading. The range hood 10 may also include components such as a control module and a filter.

[0031] The liquid level detection device 20 is used to detect the liquid level of the oil cup 103 at appropriate times to prevent the oil cup 103 from overflowing. The liquid level detection device 20 may include a sensor 201, a moving structure 203, and an oil-proof structure 205. The sensor 201 is used to detect the liquid level of the oil cup 103.

[0032] The oil-proof structure 205 can be a hollow structure that can accommodate the sensor 201. When the sensor 201 is not performing liquid level detection, the oil-proof structure 205 places the sensor 201 inside to protect the sensor 201 from oil contamination.

[0033] The motion mechanism may include an electric motor or other drive device, as well as mechanical components, for controlling the movement of sensor 201 between the inside and outside of the oil-proof structure 205. Through the motion mechanism 203, sensor 201 can be located inside the oil-proof structure 205 when detection is not required; when liquid level detection is needed, sensor 201 is moved by the motion mechanism 203 to the outside of the oil-proof structure 205. When sensor 201 is outside the oil-proof structure 205, it can detect the liquid level in oil cup 103.

[0034] In an optional embodiment, when the detection process occurs, the control module activates a motion mechanism. This mechanism drives the sensor 201 from inside the oil-proof structure 205 to the outside, detecting the liquid level in the oil cup 103 and recording the detected level value for use in the next detection. After the detection is complete, the motion mechanism controls the sensor 201 to return to the oil-proof structure 205, where it is sealed to prevent contamination.

[0035] In addition, it should be noted that, Figure 1 The example shown is merely one application environment of the liquid level detection method for range hoods provided in this disclosure.

[0036] It should be noted that the following diagram illustrates one possible sequence of steps, and it is not strictly required to follow this order. Some steps can be performed in parallel without interdependence. All user information and data disclosed herein are authorized by the user or fully authorized by all parties.

[0037] Figure 2 This is a flowchart illustrating a liquid level detection method in a range hood according to an exemplary embodiment. Figure 2 As shown, the steps may include the following.

[0038] In step S201, the historical liquid level value of the oil cup is obtained.

[0039] In the embodiments of this specification, the historical liquid level value may refer to the liquid level value of the oil cup at the time of the last liquid level detection.

[0040] In one possible implementation, historical liquid level values ​​can be stored in the range hood's control module. The control module can use sensors to record and save the liquid level value in the oil cup after each level detection, serving as reference data for the next detection.

[0041] In one optional implementation, the control module can acquire multiple historical liquid level values ​​after repeated detections and deduce the trend of liquid level change in the oil cup through data analysis. The liquid level change trend can optimize the detection frequency and avoid detection errors caused by detection intervals that are too short or too long.

[0042] In one possible implementation, the liquid level record of the oil cup is obtained; if no historical liquid level value exists in the liquid level record, the liquid level of the oil cup is detected.

[0043] In the embodiments described in this specification, the liquid level record can be a set of data records in the range hood control module, which can indicate whether historical liquid level values ​​exist. The liquid level record can save the results after each liquid level detection.

[0044] In one possible implementation, the control module can retrieve the liquid level value from the last liquid level detection by querying historical records in the memory. After the sensor completes the liquid level detection, the control module can store the detected liquid level value in the range hood's storage device, so that the value can be retrieved for comparison and analysis as a historical liquid level value during the next detection.

[0045] In one possible implementation, the control module can check the integrity of the liquid level record. If the historical liquid level value is not present in the record, the control module can actively control the sensor to perform a detection and store the detection result as a historical liquid level value for subsequent detection.

[0046] In one alternative implementation, the liquid level record may further include a timestamp of the liquid level detection and detection cycle information. The control module can use this information to determine whether a new detection operation is needed, or to adjust the frequency and timing of liquid level detection.

[0047] In practical applications, by acquiring the liquid level record of the oil cup and performing the test when there is no historical data, each liquid level test can have historical data as a reference, avoiding detection errors caused by the lack of data, and providing a reliable historical data basis for subsequent liquid level tests.

[0048] In step S203, the operating status of the fan and the fan operating time are obtained.

[0049] In the embodiments of this specification, the operating state can refer to the current working state of the fan. Specifically, it can include the on state or the off state.

[0050] The fan operating time represents the cumulative time the fan has been running since the last liquid level check. Fan operating time is used to assess the workload of the range hood and the amount of grease that may be generated, thus serving as a reference for deciding whether to perform the next liquid level check.

[0051] In one possible implementation, the operating time of the wind turbine can be recorded in real time using a timer or time accumulator. Whenever the wind turbine is on, the timer begins to accumulate time; once the wind turbine is off, the timer stops accumulating and saves the current duration.

[0052] In one alternative implementation, the runtime can be recorded according to different fan operating modes (e.g., low speed, medium speed, or high speed). The amount of oil fume generated by the fan varies in different operating modes, therefore the frequency of liquid level detection may also differ. The control module can dynamically adjust the timing of liquid level detection based on the fan's operating duration in different modes.

[0053] In practical applications, by acquiring the operating status and cumulative operating time of the fan, the accumulation of oil in the oil cup can be better assessed, allowing for a more reasonable scheduling of the frequency and timing of level detection. This method not only reduces unnecessary detection operations but also lowers the risk of oil contamination of the sensor, extending its lifespan.

[0054] In one possible implementation, the operating status of the fan and the duration of fan operation are obtained when the range hood does not trigger a full oil alarm.

[0055] In the embodiments of this specification, the full oil alarm can be an alarm signal issued by the range hood when it detects that the oil level in the oil cup is close to full.

[0056] In one possible implementation, the system can determine whether a full oil alarm has been triggered based on the fan's operating status. If no full oil alarm has been triggered, the fan's operating status and cumulative duration will be acquired as the basis for subsequent liquid level detection.

[0057] In practical applications, by obtaining the operating status and operating duration of the fan when the range hood does not trigger a full oil alarm, the ability to manage the oil cup level can be improved, avoiding unnecessary level detection, further extending the service life of the equipment and reducing maintenance costs.

[0058] In step S205, when the running state is off, the oil cup liquid level status is determined based on the comparison between historical liquid level values ​​and preset liquid level thresholds.

[0059] In the embodiments described in this specification, the preset liquid level threshold can refer to a reference standard for the oil level in the oil cup. The preset liquid level threshold can be set according to factors such as the design capacity of the range hood and the rate of oil accumulation, and is used to determine whether the current liquid level in the oil cup has reached the critical point where detection or cleaning is required.

[0060] The oil cup level status refers to the comparison between the current oil cup level and a preset level threshold. The oil cup level status may be divided into different levels to indicate whether further action (such as cleaning or issuing a full oil alarm) is required due to oil contamination in the oil cup.

[0061] In one possible implementation, the current oil level in the cup can be determined by comparing historical liquid level values ​​with a preset liquid level threshold. For example, if the historical liquid level value reaches or exceeds the preset liquid level threshold, the oil level in the cup may be determined to be close to full; if the historical liquid level value is lower than the preset liquid level threshold, the oil level in the cup may be determined to be normal.

[0062] In one alternative implementation, the preset liquid level threshold can be dynamically adjusted based on parameters such as the usage frequency of the range hood and the oil-stain separation efficiency.

[0063] In practical applications, the oil level status of the cup can be determined by comparing historical liquid level values ​​with a preset liquid level threshold. This avoids frequent detection, reduces reliance on sensors, and lowers the risk of sensors being contaminated by oil.

[0064] In one possible implementation, the preset liquid level threshold includes a first liquid level threshold; if the historical liquid level value is greater than or equal to the first liquid level threshold, the liquid level state of the oil cup is determined to be a first risk state.

[0065] In the embodiments described in this specification, the first liquid level threshold can refer to a critical value reached by the oil level in the oil cup. The first liquid level threshold can be preset according to factors such as the design parameters of the range hood, the storage capacity of the oil cup, and the rate of oil accumulation.

[0066] The first risk state can refer to the liquid level state when the oil cup reaches or exceeds the first liquid level threshold. The first risk state indicates that there is a risk of the oil cup being full.

[0067] In one possible implementation, when the historical liquid level value of the oil cup is greater than or equal to a first liquid level threshold, the liquid level status of the oil cup can be determined as a first-risk state. In this state, the time interval for liquid level detection may be shortened, and the detection frequency increased to ensure timely monitoring of changes in the oil cup and prevent it from becoming overfilled.

[0068] In one alternative implementation, the first liquid level threshold can be dynamically adjusted based on the operating frequency of the range hood, the amount of grease accumulation, and the actual usage of the grease cup. For example, when an increase in the operating frequency of the range hood is detected, the first liquid level threshold can be appropriately lowered.

[0069] In one alternative implementation, the first liquid level threshold can be automatically adjusted by analyzing historical liquid level values ​​and liquid level change trends from multiple detections.

[0070] In one possible implementation, if the historical liquid level value is less than a first liquid level threshold, the oil cup liquid level is determined to be in a normal liquid level state.

[0071] In the embodiments of this specification, the normal liquid level state refers to the state in which the liquid level of the oil cup has not reached the first liquid level threshold; the normal liquid level state indicates that there is no risk of the oil cup being full of oil.

[0072] In one possible implementation, when the historical liquid level value is lower than a first liquid level threshold, the liquid level in the oil cup can be determined to be in a normal state. In this case, routine liquid level monitoring can be performed according to a set detection cycle to maintain a reasonable detection frequency. This operation can effectively reduce over-reliance on the sensor, extend the sensor's lifespan, and ensure the rationality of the detection frequency.

[0073] In one alternative implementation, the normal liquid level status can be further determined based on the historical changes in the oil level of the oil cup and the user's usage habits.

[0074] In practical applications, by setting a first liquid level threshold and judging based on the liquid level value, the liquid level status of the oil cup can be predicted in advance, allowing for timely and appropriate measures to be taken, thereby effectively avoiding the risk of oil cup overflow. Simultaneously, if the oil cup level has not reached the threshold, it can maintain a normal state, reducing unnecessary detection operations, improving the sensor's working efficiency, and extending its service life.

[0075] In one possible implementation, the oil cup level is determined to be in a second risk state if the historical liquid level value is greater than or equal to a second liquid level threshold.

[0076] In the embodiments described in this specification, the second liquid level threshold can be a critical value close to the maximum capacity of the oil cup. The second liquid level threshold is greater than the first liquid level threshold.

[0077] The second risk state refers to the state when the oil level in the cup reaches or exceeds a second level threshold. The second risk state indicates that the oil in the cup needs to be emptied. Compared to the first risk state, the second risk state signifies a higher level of urgency, requiring immediate cleaning of the oil to prevent overflow.

[0078] In one possible implementation, when the historical liquid level value is greater than or equal to a second liquid level threshold, the oil cup's liquid level status can be determined as a second risk state. In this state, a series of actions may be triggered, such as further increasing the detection frequency to monitor the liquid level status, or reminding the user to clean the oil cup, so that a timely processing command can be issued when the oil cup reaches full.

[0079] In one optional implementation, the second liquid level threshold can be adjusted based on the usage of the range hood and the accumulation rate of the oil cup. When the oil cup is detected to be close to full, the second liquid level threshold can be dynamically adjusted by analyzing multiple historical liquid level detection data to more accurately reflect the true state of the oil cup.

[0080] In one possible implementation, the range hood is controlled to trigger a full oil alarm when the oil cup is in a second-risk state.

[0081] In one possible implementation, a full oil alarm might be triggered when the oil cup enters a second risk state. This alarm could alert the user in various ways, such as through an audible alert, a display screen notification, or a notification sent via a networked device. During a full oil alarm state, some functions of the range hood might be suspended until the oil cup is emptied.

[0082] In practical applications, by setting a second liquid level threshold and a second risk state, the oil cup level can be detected in a timely and accurate manner when it is close to or reaches the full state, and a full oil alarm can be triggered when necessary, effectively preventing the oil cup from overflowing and improving the safety and ease of use of the range hood.

[0083] In one possible implementation, if the range hood triggers a full oil alarm and the historical liquid level value is less than the alarm liquid level threshold, the range hood is controlled to stop triggering the full oil alarm.

[0084] In the embodiments of this specification, the alarm liquid level threshold can refer to the critical value of the oil cup liquid level used to determine whether to cancel the full oil alarm, and the alarm liquid level threshold is less than the second liquid level threshold.

[0085] In one possible implementation, if the user pours out some of the oil from the oil cup after the range hood issues a full oil alarm, causing the oil level in the cup to drop below the alarm level threshold, the range hood can be automatically controlled to stop issuing the full oil alarm.

[0086] In one possible implementation, the oil cup level can be monitored in real time using a liquid level detection device. When a historical liquid level value is detected to be lower than the alarm liquid level threshold, the range hood is controlled to cancel the full oil alarm, and the current liquid level value is stored as a historical liquid level value for use in the next detection.

[0087] In one alternative implementation, the alarm liquid level threshold can be dynamically adjusted based on the actual usage of the range hood. For example, in a kitchen with high usage frequency, the alarm liquid level threshold can be set lower to ensure that even after some grease has been cleaned, a high level of alertness is maintained to prevent further oil spills.

[0088] In practical applications, by setting an alarm liquid level threshold, the full oil alarm signal can be promptly canceled when the oil level in the cup drops to a safe range, preventing false alarms. This method not only improves the accuracy of liquid level detection but also enhances the overall operating efficiency of the range hood, ensuring a rapid response after users have dealt with oil stains, thus improving the user experience.

[0089] In step S207, when the oil cup level indicates a risk of the oil cup being full and the fan operation time exceeds a predetermined time, the oil cup level is detected and the oil cup level value obtained from the level detection is recorded.

[0090] In the embodiments of this specification, the predetermined duration refers to the cumulative operating time of the fan during the operation of the range hood, used to determine whether the fan operating time is long enough as a reference for triggering the liquid level detection. The predetermined duration can be dynamically set according to the usage frequency of the range hood and the rate of grease accumulation.

[0091] In one possible implementation, when the fan has been running for a predetermined duration, it indicates that the oil in the oil cup has accumulated to a certain amount. Therefore, it is necessary to detect the oil level in the oil cup to prevent overflow. Specifically, the fan running time can be recorded by a time accumulator in the control module. Each time the fan starts, the time accumulator increments the fan's running time until it stops when the fan is turned off.

[0092] In one possible implementation, a liquid level detection operation can be automatically triggered if the blower is detected to have been running for a duration exceeding a predetermined time. The sensor measures the liquid level in the oil cup in real time and records the detected liquid level value in the control module's memory as reference data for the next detection.

[0093] In one alternative implementation, the preset duration can be correlated with the range hood's usage pattern and the user's cooking habits. For example, in a frequently used kitchen, the preset duration can be set shorter to increase the detection frequency and prevent the oil cup from overflowing due to excessive grease. Conversely, in scenarios with lower usage frequency, the preset duration can be set longer to avoid over-detection.

[0094] In practical applications, setting a predetermined time interval as a judgment criterion ensures timely detection when the oil cup is close to full, preventing oil overflow. Furthermore, setting a reasonable predetermined time interval can optimize sensor usage frequency, extend sensor lifespan, reduce range hood maintenance costs, and improve overall operating efficiency.

[0095] For example, with Figure 3 For example, Figure 3 This is a flowchart illustrating an oil cup in a first risk state or a normal liquid level state according to an exemplary embodiment.

[0096] In one possible implementation, when the oil cup is in the first risk state and the blower is turned on for a duration longer than the first preset duration, the oil cup is subjected to liquid level detection.

[0097] In the embodiments of this specification, the first preset duration can refer to a preset cumulative fan operating time threshold when the oil cup level is in the first risk state. The first preset duration can be a fixed time value set based on the average fan operating time or the oil fume accumulation rate, used to promptly detect the oil level when the oil cup level approaches the set first liquid level threshold.

[0098] In one possible implementation, when the oil cup is in the first risk state and the blower is running for a longer than a first preset time, the liquid level can be detected by controlling the sensor, the changes in the liquid level of the oil cup can be recorded in a timely manner, and the detected liquid level value can be saved as a reference for the next liquid level detection.

[0099] In one alternative implementation, the first preset duration can be dynamically adjusted based on the historical oil level in the oil cup and the operating duration of the fan. This ensures that the detection frequency is increased when the range hood is used frequently, while unnecessary detection operations are reduced when it is used infrequently.

[0100] In one possible implementation, the second preset duration is longer than the first preset duration; when the oil cup is at the normal liquid level and the blower is turned on for a duration longer than the second preset duration, the liquid level of the oil cup is detected.

[0101] In the embodiments of this specification, the second preset duration may refer to the preset cumulative fan start-up duration threshold when the oil cup is in a normal liquid level state.

[0102] In one possible implementation, the second preset duration can be dynamically adjusted based on historical data of the oil cup level and the fan's operating mode. The second preset duration is used to assess whether a check is necessary when the oil cup level is low. Since the oil cup is not yet full, the check frequency is low and the check interval is long. This setting helps ensure that the oil cup level is checked periodically, even when it does not frequently approach full, to prevent any accidental overflow.

[0103] In practical applications, setting the first and second preset durations appropriately can balance the detection frequency of the range hood with the lifespan of the sensor. When the oil cup level is in a high-risk state, a shorter detection cycle can be used to monitor the oil cup level in a timely manner; when the oil cup level is in a normal state, the detection cycle can be extended to reduce unnecessary detection operations, thereby effectively extending the lifespan of the sensor and optimizing the operating efficiency of the range hood.

[0104] For example, with Figure 4 For example, Figure 4 This is a flowchart illustrating an oil cup in a second risk state according to an exemplary embodiment.

[0105] In one possible implementation, if the fan is not in a shut-off state, it is determined whether liquid level detection is currently in progress. In this case: if liquid level detection is detected, the detection process will be terminated to avoid repeated operations. If liquid level detection is not in progress, the process will return and re-acquire the fan's operating status and operating duration for further judgment.

[0106] In one possible implementation, the duration of the range hood's operation is obtained when the range hood triggers a full oil alarm.

[0107] In the embodiments of this specification, the range hood operating time can refer to the cumulative operating time of the range hood since the last liquid level detection, under the condition of a full oil alarm. The range hood operating time characterizes the cumulative operating time of the range hood since the last liquid level detection.

[0108] In one possible implementation, even if the range hood issues a full oil alarm signal, the user may not empty the oil cup in time, and the range hood will continue to run. In this case, recording the cumulative operating time of the range hood can help determine whether another liquid level check is needed to ensure accurate monitoring of the oil cup's level and prevent oil overflow.

[0109] In one possible implementation, when the range hood is in a full oil alarm state and the cumulative operating time exceeds a third preset time, a new liquid level detection operation will be triggered. The sensor will re-detect the liquid level in the oil cup and record the detected liquid level value as a reference value for subsequent detection.

[0110] In one possible implementation, the oil level in the oil cup is detected when the range hood is turned on for a duration longer than a third preset duration; the third preset duration is shorter than the first preset duration.

[0111] In the embodiments of this specification, the third preset duration may refer to the threshold of the cumulative running time allowed by the range hood when the oil full alarm is triggered, and the third preset duration is less than the first preset duration.

[0112] In one possible implementation, when the range hood is running continuously and the user has not emptied the oil cup in time, if the range hood has been running for longer than a third preset time, a liquid level detection function can be performed to obtain the oil cup's liquid level information in a timely manner, preventing the oil cup from overflowing. Since the oil cup is already close to full when the oil is full, the third preset time is set shorter than the first preset time to monitor the oil cup level more frequently and avoid oil overflow.

[0113] In one alternative implementation, the third preset duration can be a dynamic parameter set according to the usage scenario of the range hood.

[0114] In practical applications, by setting a third preset duration, the range hood can monitor the oil cup level more frequently when a full oil alarm is triggered, preventing safety issues caused by oil overflow. Furthermore, because the third preset duration is shorter than the first, the system can perform checks more frequently when the oil is full, effectively preventing oil spills caused by excessive levels.

[0115] In one possible implementation, the range hood is equipped with a moving structure, an oil-proof structure, and a sensor. The range hood adjusts the positional relationship between the oil-proof structure and the sensor through the moving structure; controls the moving structure to move from the position of the sensor inside the oil-proof structure to the position of the sensor outside the oil-proof structure; controls the sensor to detect the oil cup and records the liquid level value of the oil cup obtained by the liquid level detection.

[0116] In the embodiments of this specification, the moving structure can be a mechanical device for driving the sensor to move, specifically including an electric motor, a transmission rod, etc. The moving structure is used to move the sensor from inside the oil-proof structure to the outside to perform liquid level detection at an appropriate time. After detection, the moving structure can move the sensor back into the oil-proof structure to prevent the sensor from being contaminated by oil.

[0117] The oil-proof structure can be a hollow protective cover used to house the sensor when it is not detecting liquid levels, preventing contamination from oil fumes or oil. The oil-proof structure may include a sealed opening through which the moving parts control the sensor's entry and exit. When the sensor enters the oil-proof structure, the opening automatically closes, forming a seal and further enhancing protection.

[0118] The sensor is a ranging sensor used to detect the liquid level in the oil cup; specifically, it can be a laser ranging sensor or an ultrasonic sensor. After being moved outside the oil-proof structure, the sensor detects the liquid level in the oil cup and transmits the detected value to the range hood's control module for storage and processing.

[0119] Positional relationship refers to the relative position between the sensor and the oil-resistant structure. Positional relationship can include situations where the sensor is inside the oil-resistant structure and where the sensor is outside the oil-resistant structure.

[0120] In one possible implementation, the control module can control a motion structure to move the sensor from inside the oil-proof structure to the outside, and then move the sensor back inside the oil-proof structure after detection. When the sensor is on the outside, liquid level detection can be performed and the detected liquid level value recorded. After the detection process is complete, the control module can store the detection results as historical liquid level values ​​for use in the next detection.

[0121] In one alternative embodiment, the oil-resistant structure may also have a cleaning function, in which the internal structure can automatically clean the sensor surface when the sensor returns to the interior of the oil-resistant structure, thereby further extending the sensor's service life.

[0122] In practical applications, the combined use of a moving structure and an oil-resistant structure can protect the sensor from oil corrosion when not in use, extending the lifespan of the equipment and ensuring the accuracy of each liquid level detection, thus preventing oil cup overflow.

[0123] For example, with Figure 5 For example, Figure 5 This is a structural diagram illustrating a fully enclosed oil-proof structure according to an exemplary embodiment. The sensing window is disposed inside the hollow portion of the oil-proof structure to prevent oil from directly contacting the sensor during liquid level detection. The oil-proof structure can be a fully enclosed hollow structure with an openable and closable switch structure. This exposes the sensing window during liquid level detection and closes it after detection. A motion structure drives the opening and closing of the switch structure. When liquid level detection is required, the motion structure controls the switch structure to open, exposing the sensing window so that the liquid level detection device can detect the oil cup; after detection, the motion structure controls the switch structure to close, protecting the sensing window inside the oil-proof structure to prevent oil contamination of the sensor.

[0124] For example, with Figure 6 For example, Figure 6 This is a structural diagram illustrating an open-type oil-proof structure according to an exemplary embodiment. The oil-proof structure is a hollow structure that is closed on all four sides but has an opening on one side, through which a sensing window can enter or extend into the oil-proof structure. The sensing window faces the liquid surface of the oil cup for accurate detection of the liquid level. A moving structure is used to drive the sensing window to enter or extend through the opening of the oil-proof structure. When liquid level detection is required, the moving structure controls the sensing window to extend out of the oil-proof structure, exposed through the opening, for liquid level detection. After detection, the moving structure drives the sensing window back into the oil-proof structure. Simultaneously, a sealing cap on the moving structure seals the opening after the sensing window enters the oil-proof structure, preventing oil from entering the interior of the oil-proof structure and ensuring that the sensing window is not contaminated by oil.

[0125] Figure 7 This is a block diagram illustrating a liquid level detection device in a range hood according to an exemplary embodiment. (Refer to...) Figure 7 The device may include: the range hood is equipped with a fan and an oil cup; the device includes a sensor 701; the sensor 701 is used to detect the oil level in the oil cup when the oil cup is at risk of being full of oil and the fan is turned on for a longer than a predetermined time.

[0126] The oil cup level is determined by comparing the historical oil cup level with a preset level threshold when the fan is in the off state. The historical level value refers to the oil cup level at the time of the last level detection. The fan start-up time represents the cumulative time the fan has been running since the last level detection.

[0127] In one possible implementation, the device further includes a motion structure 703 and an oil-resistant structure 705; the oil-resistant structure 705 is a hollow structure that can accommodate the sensor 701.

[0128] When not detecting liquid level, the sensor 701 is located inside the oil-proof structure 705;

[0129] The motion structure 703 is used to adjust the sensor 701 from inside the oil-proof structure 705 to outside the oil-proof structure 705 when the oil level status of the oil cup indicates that the oil cup is at risk of being full and the blower is running for a longer than predetermined time, so that the sensor 701 is in the state of liquid level detection.

[0130] When the sensor 701 is in the liquid level detection state, it detects the liquid level in the oil cup.

[0131] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0132] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0133] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A method for detecting liquid level in a range hood, characterized in that, The range hood is equipped with a fan and an oil cup, and the method includes: Obtain the historical liquid level value of the oil cup; the historical liquid level value refers to the liquid level value of the oil cup during the last liquid level detection; The operating status and operating duration of the fan are obtained; the operating duration of the fan represents the cumulative operating time of the fan since the last liquid level detection. When the operating state is off, the oil cup level is determined based on the comparison between the historical liquid level value and the preset liquid level threshold. When the oil cup level indicates a risk of the oil cup becoming full and the fan operation time exceeds a predetermined time, the oil cup level is detected and the detected oil cup level value is recorded.

2. The method according to claim 1, characterized in that, The preset liquid level threshold includes a first liquid level threshold; the predetermined duration includes a first preset duration; determining the oil cup liquid level state based on the comparison between the historical liquid level value and the preset liquid level threshold includes: If the historical liquid level value is greater than or equal to the first liquid level threshold, the liquid level status of the oil cup is determined to be a first risk status; the first risk status indicates that the oil cup is at risk of being full. When the oil cup level indicates a risk of overfilling and the fan operation time exceeds a predetermined duration, the oil cup level detection includes: When the oil cup is in the first risk state and the blower is turned on for a duration longer than the first preset duration, the oil cup is subjected to liquid level detection.

3. The method according to claim 2, characterized in that, The predetermined duration further includes a second predetermined duration; the second predetermined duration is longer than the first predetermined duration; determining the oil cup level status based on the comparison between the historical liquid level value and the predetermined liquid level threshold includes: If the historical liquid level value is less than the first liquid level threshold, the liquid level state of the oil cup is determined to be a normal liquid level state; the normal liquid level state indicates that the oil cup is not at risk of being full. The method further includes: When the oil cup is at the normal liquid level and the blower is turned on for a duration longer than the second preset duration, the liquid level of the oil cup is detected.

4. The method according to claim 2, characterized in that, The preset liquid level threshold further includes a second liquid level threshold; the second liquid level threshold is greater than the first liquid level threshold; determining the oil cup liquid level state based on the comparison between the historical liquid level value and the preset liquid level threshold includes: If the historical liquid level value is greater than or equal to the second liquid level threshold, the liquid level state of the oil cup is determined to be a second risk state; the second risk state indicates that the oil in the oil cup needs to be emptied. The step of detecting the oil level in the oil cup when the oil cup level indicates a risk of overfilling, and when the fan operation time exceeds a predetermined time, is replaced by: If the oil cup is in the second risk state, control the range hood to issue a full oil alarm.

5. The method according to claim 4, characterized in that, The method further includes: If the range hood triggers a full oil alarm and the historical liquid level value is less than the alarm liquid level threshold, the range hood is controlled to stop triggering the full oil alarm; the alarm liquid level threshold is less than the second liquid level threshold.

6. The method according to claim 1, characterized in that, The process of obtaining the operating status and operating duration of the fan includes: If the range hood does not trigger a full oil alarm, the operating status of the fan and the duration of fan operation are obtained.

7. The method according to claim 6, characterized in that, The method further includes: When the range hood triggers a full oil alarm, the range hood operating time is obtained; the range hood operating time represents the cumulative operating time of the range hood since the last liquid level detection. If the range hood is turned on for a duration longer than a third preset duration, the oil level in the oil cup is detected; the third preset duration is shorter than the first preset duration.

8. The method according to claim 1, characterized in that, The method further includes: Obtain the liquid level record of the oil cup; the liquid level record indicates whether there are historical liquid level values; If no historical liquid level value is found in the liquid level record, the liquid level of the oil cup is detected.

9. The method according to claim 1, characterized in that, The range hood is equipped with a moving structure, an oil-proof structure, and a sensor. The range hood adjusts the positional relationship between the oil-proof structure and the sensor through the moving structure. The positional relationship includes the sensor being inside the oil-proof structure and the sensor being outside the oil-proof structure. The step of detecting the liquid level in the oil cup and recording the liquid level value obtained from the detection includes: Control the movement of the motion structure to adjust it from the position of the sensor inside the oil-proof structure to the position of the sensor outside the oil-proof structure; The sensor is controlled to detect the oil cup and record the liquid level value of the oil cup obtained by the liquid level detection.

10. A liquid level detection device for a range hood, characterized in that, The range hood is equipped with a fan and an oil cup; the device includes a sensor; the sensor is used to detect the oil level in the oil cup when the oil cup is at risk of being full of oil and the fan is turned on for a longer than a predetermined time. The oil cup level is determined by comparing the historical oil cup level with a preset level threshold when the fan is in the off state. The historical level value refers to the oil cup level at the time of the last level detection. The fan start-up time represents the cumulative time the fan has been running since the last level detection.

11. The apparatus according to claim 10, characterized in that, The device also includes a moving structure and an oil-resistant structure; the oil-resistant structure is a hollow structure that can accommodate the sensor. When not detecting liquid level, the sensor is located inside the oil-proof structure. The motion structure is used to adjust the sensor from inside the oil-proof structure to outside the oil-proof structure when the oil level status of the oil cup indicates that the oil cup is at risk of being full and the blower is turned on for a longer than predetermined time, so that the sensor is in the state of liquid level detection. When the sensor is in the liquid level detection state, it detects the liquid level in the oil cup.

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