Range hood vibration abnormity detection method and oil smoke treatment equipment adopting same

Abstract

The invention discloses a method for detecting abnormal vibration of a range hood and lampblack treatment equipment adopting the method, and belongs to the technical field of kitchen appliances. The method comprises the following steps: S1, data acquisition: acquiring a rotating speed n and a vibration amplitude; s2, judging the stability of the rotating speed, namely judging whether the rotating speed is stable or not, if so, executing the step S3, and if not, executing the step S4; s3, carrying out interval classification on the rotating speed, respectively carrying out vibration threshold comparison, and if the vibration amplitude is greater than the vibration threshold of the corresponding interval, triggering a vibration abnormity alarm; step S4, acquiring a continuous unstable time length T; if T is greater than or equal to Tth, executing the step S5, and if T is less than Tth, judging that transient interference exists; and S5, judging whether the rotating speed exceeds the limit or not, if yes, starting speed reduction protection and triggering a user alarm, and if not, returning to the step S4. By synchronously monitoring the rotating speed and the vibration data and combining rotating speed stability judgment and inter-partition vibration threshold value comparison, misjudgment is prevented, and therefore the use safety is improved.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliance technology, and in particular to a method for detecting abnormal vibration of a range hood and an oil fume treatment device using the method. Background Technology

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. Its main function is to remove cooking fumes during cooking, thus maintaining a clean kitchen environment. Existing range hoods include a duct assembly and a smoke collection hood, with the hood located below and connected to the duct assembly. The duct assembly includes a main unit and a centrifugal fan housed within it; the centrifugal fan is the power source of the range hood. During operation, the centrifugal fan creates a negative pressure zone above the stove, drawing cooking fumes into the duct assembly through the smoke collection hood. The fumes are then exhausted outdoors through ductwork.

[0003] Range hoods generate noise during operation, and this noise level is an important performance indicator for evaluating the product. The vibration of the motor inside the range hood exacerbates and amplifies the overall noise. Traditional methods for detecting range hood vibration typically involve collecting and analyzing vibration signals from the motor during operation; this allows for real-time monitoring of the range hood's operating status, providing timely reminders to users to clean or replace the impeller to prevent wear and tear on the internal structure of the volute.

[0004] Current technologies for detecting abnormal vibration in range hoods primarily consider vibration amplitude, neglecting rotational speed. In some cases, the range hood may be running at low speed, exhibiting abnormal vibration, but the amplitude may not reach the threshold, thus failing to detect the abnormality and triggering an alarm. Furthermore, normal vibrations during changes in range hood rotational speed may be misinterpreted. Range hood vibration detection typically relies solely on fixed vibration thresholds, which has the following drawbacks:

[0005] (1) Only the vibration amplitude was detected, without taking into account the motor speed and status for comprehensive judgment;

[0006] (2) It cannot distinguish between speed fluctuations and stable states, and is prone to misjudgment due to shifting periods or changes in back pressure;

[0007] (3) The same vibration threshold is used in the high-speed zone and the low-speed zone, resulting in low detection accuracy.

[0008] For example, existing patent 1 (CN201510703778.3) proposes a method and system for diagnosing range hood faults based on EMD noise reduction, providing a method to determine whether the impeller is faulty by performing noise analysis on vibration; patent 1 only includes a method for judging vibration signals, but does not disclose a method for judging whether the range hood is working normally by the motor speed; patent 2 (CN202410034035.0) proposes an integrated stove and fan system and control method, providing a method for controlling the motor speed by monitoring the vibration signal of the motor operation; patent 2 only includes a method for controlling the motor speed by vibration signals, but does not disclose a method for judging whether there is abnormal vibration based on a threshold; patent 3 (CN202410360732.5) proposes a vibration reduction method, device, range hood and storage medium; patent 3 performs vibration reduction processing based on amplitude, rather than judging whether vibration occurs based on amplitude.

[0009] Therefore, there is an urgent need to design a method for detecting abnormal vibration of a range hood and an oil fume treatment device using this method to solve the above-mentioned technical problems. Summary of the Invention

[0010] The purpose of this invention is to propose a method for detecting abnormal vibration of a fume hood and an oil fume treatment device using this method, which can improve the monitoring accuracy of the operating conditions of the oil fume treatment device, prevent misjudgment, and thus improve the safety of use.

[0011] To achieve this objective, the present invention adopts the following technical solution:

[0012] A method for detecting abnormal vibration in a range hood includes:

[0013] Step S1, Data Acquisition: Acquisition of rotational speed n and vibration amplitude;

[0014] Step S2, Speed ​​stability judgment: Determine whether the speed is stable. If yes, proceed to step S3; otherwise, proceed to step S4.

[0015] Step S3: Classify the rotation speed into intervals and compare the vibration thresholds for each interval. If the vibration amplitude is greater than the vibration threshold of the corresponding interval, trigger a vibration abnormality alarm.

[0016] Step S4: Obtain the duration of continuous instability T; if T≥T_th, proceed to step S5; if T<T_th, it is determined to be a transient disturbance.

[0017] Step S5: Determine if the speed exceeds the limit. If yes, start the speed reduction protection and trigger the user alarm. If no, return to step S4.

[0018] As an optional technical solution for the above-mentioned abnormal vibration detection method of the smoke machine,

[0019] Step S1, the acquisition of rotational speed n, includes: sampling frequency of the Hall sensor, and calculation of rotational speed by counting the magnetic poles of the motor rotor. , where f h Where is the Hall pulse frequency, and N is the number of pole pairs of the motor.

[0020] As an optional technical solution for the above-mentioned abnormal vibration detection method of the smoke machine,

[0021] The vibration amplitude acquisition in step S1 includes: the vibration amplitude acquisition device acquires the vibration amplitude corresponding to the rotational speed, the acquisition frequency is ≥10Hz, and the data storage period is T=5s.

[0022] As an optional technical solution for the above-mentioned abnormal vibration detection method of the smoke machine,

[0023] In step S2, the speed stabilization condition is defined as follows: within the time window Δt, the speed change rate |dn / dt|≤5rpm / s, and the final speed n_f∈[n_t-20rpm,n_t+20rpm], where n_t is the target speed.

[0024] As an optional technical solution for the above-mentioned abnormal vibration detection method of the smoke machine,

[0025] The time window Δt ranges from 3s to 5s.

[0026] As an optional technical solution for the above-mentioned abnormal vibration detection method of the smoke machine,

[0027] Step S3, which involves classifying the rotational speed into ranges, includes:

[0028] Low-speed region: n_f∈[0rpm,1500rpm];

[0029] High-speed range: n_f∈(1500rpm,n_max], where n_max is the rated maximum speed.

[0030] As an optional technical solution for the above-mentioned abnormal vibration detection method of the smoke machine,

[0031] In step S3, the vibration thresholds corresponding to different speed ranges include:

[0032] Vibration threshold in the low-speed region: A_low = 8 mm / s²;

[0033] Vibration threshold in the high-speed zone: A_high = 12 mm / s².

[0034] As an optional technical solution for the above-mentioned abnormal vibration detection method of the smoke machine,

[0035] Step S5, determining whether the rotational speed exceeds the limit, includes:

[0036] Determine whether n(t) is greater than 1.2 × n_rated, where n_rated is the rated speed.

[0037] As an optional technical solution for the above-mentioned abnormal vibration detection method of the smoke machine,

[0038] Step S5 involves activating the speed reduction protection, which includes forcibly reducing the speed to 0.8×n_rated.

[0039] To achieve this objective, the present invention also employs the following technical solutions:

[0040] An oil fume treatment device, wherein the oil fume treatment device adopts the above-mentioned method for detecting abnormal vibration of the fume machine.

[0041] Compared with the prior art, the present invention has at least the following technical effects:

[0042] The present invention discloses a method for detecting abnormal vibration in a range hood, comprising data acquisition, speed stability assessment, speed interval classification, vibration threshold comparison, obtaining the duration of continuous instability T, and determining whether the speed exceeds the limit. This method, by simultaneously monitoring speed and vibration data and combining speed stability assessment with interval vibration threshold comparison, improves the monitoring accuracy of the operating conditions of the fume treatment equipment, enhances the accuracy of abnormal vibration detection, prevents misjudgments caused by gear shifting periods or back pressure changes, and thus improves operational safety.

[0043] The fume treatment equipment disclosed in this invention has high safety and high user satisfaction. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0045] Figure 1 This is a flowchart of the flue gas machine vibration abnormality detection method provided in a specific embodiment of the present invention;

[0046] Figure 2 This is a schematic diagram of the structure of the fume treatment equipment provided in a specific embodiment of the present invention.

[0047] In the picture:

[0048] 100. Main unit chassis; 200. Smoke hood. Detailed Implementation

[0049] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0055] This embodiment discloses a method for detecting abnormal vibration of a range hood. This method is applicable to all types of devices with fume treatment functions, such as top-mounted range hoods, side-suction range hoods, and top-suction range hoods. All types of devices with fume treatment functions are within the protection scope of this embodiment. This embodiment takes a top-mounted range hood as an example to illustrate the method for detecting abnormal vibration of a range hood.

[0056] like Figure 1 As shown, the method for detecting abnormal vibration of the smoke machine includes the following steps:

[0057] Step S1, Data Acquisition: Acquisition of rotational speed n and vibration amplitude;

[0058] Step S2, Speed ​​stability judgment: Determine whether the speed is stable. If yes, proceed to step S3; otherwise, proceed to step S4.

[0059] Step S3: Classify the rotation speed into intervals and compare the vibration thresholds for each interval. If the vibration amplitude is greater than the vibration threshold of the corresponding interval, trigger a vibration abnormality alarm.

[0060] Step S4: Obtain the duration of continuous instability T; if T≥T_th, proceed to step S5; if T<T_th, it is determined to be a transient disturbance.

[0061] Step S5: Determine if the speed exceeds the limit. If yes, start the speed reduction protection and trigger the user alarm. If no, return to step S4.

[0062] Specifically, the speed n acquisition in step S1 includes: sampling frequency of the Hall sensor, and calculating the speed by counting the magnetic poles of the motor rotor. , where f h Where is the Hall pulse frequency, and N is the number of pole pairs of the motor.

[0063] Furthermore, the vibration amplitude acquisition in step S1 includes: the vibration amplitude acquisition device acquires the vibration amplitude corresponding to the rotational speed, the acquisition frequency is ≥10Hz, and the data storage period is T=5s.

[0064] Optionally, in step S2, the speed stabilization condition is defined as follows: within the time window Δt, the speed change rate |dn / dt|≤5rpm / s, and the final speed n_f∈[n_t-20rpm,n_t+20rpm], where n_t is the target speed.

[0065] Alternatively, the time window Δt can be set to a value between 3s and 5s, such as 3s, 4s, or 5s, depending on the specific circumstances.

[0066] Optionally, the range classification of rotational speed in step S3 includes:

[0067] Low-speed region: n_f∈[0rpm,1500rpm];

[0068] High-speed range: n_f∈(1500rpm,n_max], where n_max is the rated maximum speed.

[0069] Further optionally, in step S3, the vibration thresholds corresponding to different speed ranges include:

[0070] Vibration threshold in the low-speed region: A_low = 8 mm / s²;

[0071] Vibration threshold in the high-speed zone: A_high = 12 mm / s²; when the vibration amplitude A(t) > the threshold of the corresponding zone, a vibration anomaly alarm is triggered.

[0072] Optionally, the transient disturbances in step S4 include speed fluctuations caused by shift periods or changes in back pressure.

[0073] Optionally, determining whether the rotational speed exceeds the limit in step S5 includes:

[0074] Determine if n(t) is greater than 1.2 × n_rated, where n_rated is the rated speed. If so, activate the speed reduction protection and trigger a user alarm.

[0075] Furthermore, in step S5, activating the speed reduction protection includes: forcibly reducing the speed to 0.8×n_rated.

[0076] The following three specific embodiments illustrate the above-mentioned method for detecting abnormal vibration of a range hood.

[0077] Specific Implementation Example 1: Speed ​​Stability Judgment

[0078] When the user sets the airflow to high, the motor speed gradually increases from 0 rpm to 1800 rpm;

[0079] The system detected that the maximum rate of change of rotational speed within Δt=3s was 4rpm / s, and the final n_f=1790rpm∈[1780,1820]rpm, which was determined to be a stable state.

[0080] Specific Implementation Example 2: Vibration Anomaly Detection

[0081] When the high-speed zone n_f=1600rpm, the vibration amplitude A(t)=15mm / s²>A_high=12mm / s², triggering an alarm and recording event code "E001".

[0082] Specific Implementation Example 3: Unstable State Handling:

[0083] If the continuous unstable duration T = 12s > 10s due to the shift period, and the condition that n(t) = 2000rpm > 1.2 × 1800rpm = 2160rpm is not met, then only the event code is recorded and judged as transient interference "E002" without reducing speed.

[0084] The method for detecting abnormal vibration of a range hood disclosed in this embodiment includes data acquisition, speed stability assessment, speed interval classification, vibration threshold comparison, obtaining the duration of continuous instability T, and determining whether the speed exceeds the limit. This method, by simultaneously monitoring speed and vibration data and combining speed stability assessment with interval vibration threshold comparison, can improve the monitoring accuracy of the operating conditions of the fume treatment equipment, enhance the accuracy of abnormal vibration detection, prevent misjudgments caused by gear shifting periods or back pressure changes, and thus improve operational safety.

[0085] This embodiment also provides an oil fume treatment device that uses the above-mentioned abnormal vibration detection method for exhaust fans, which has high safety and high user satisfaction.

[0086] Specifically, such as Figure 2 As shown, the fume treatment equipment includes a main unit housing 100 and a fume collection hood 200, with the hood 200 connected below the main unit housing 100. The main unit housing 100 includes an air duct, which comprises a volute and a motor. By collecting the motor's rotational speed to determine the speed range, vibration detection is achieved, thereby regulating the fume treatment equipment.

[0087] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

[0088] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A method for detecting abnormal vibration in a smoke machine, characterized in that, include: Step S1, Data Acquisition: Acquisition of rotational speed n and vibration amplitude; Step S2, Speed ​​stability judgment: Determine whether the speed is stable. If yes, proceed to step S3; otherwise, proceed to step S4. Step S3: Classify the rotation speed into intervals and compare the vibration thresholds for each interval. If the vibration amplitude is greater than the vibration threshold of the corresponding interval, trigger a vibration abnormality alarm. Step S4: Obtain the duration of continuous instability T; if T≥T_th, proceed to step S5; if T<T_th, it is determined to be a transient disturbance. Step S5: Determine if the speed exceeds the limit. If yes, start the speed reduction protection and trigger the user alarm. If no, return to step S4.

2. The method for detecting abnormal vibration of a smoke machine according to claim 1, characterized in that, Step S1, the acquisition of rotational speed n, includes: sampling frequency of the Hall sensor, and calculation of rotational speed by counting the magnetic poles of the motor rotor. , where f h Where is the Hall pulse frequency, and N is the number of pole pairs of the motor.

3. The method for detecting abnormal vibration of a smoke machine according to claim 1, characterized in that, The vibration amplitude acquisition in step S1 includes: the vibration amplitude acquisition device acquires the vibration amplitude corresponding to the rotational speed, the acquisition frequency is ≥10Hz, and the data storage period is T=5s.

4. The method for detecting abnormal vibration of a smoke machine according to claim 1, characterized in that, In step S2, the speed stabilization condition is defined as follows: within the time window Δt, the speed change rate |dn / dt|≤5rpm / s, and the final speed n_f∈[n_t-20rpm,n_t+20rpm], where n_t is the target speed.

5. The method for detecting abnormal vibration of a smoke machine according to claim 4, characterized in that, The time window Δt ranges from 3s to 5s.

6. The method for detecting abnormal vibration of a smoke machine according to claim 1, characterized in that, Step S3, which involves classifying the rotational speed into ranges, includes: Low-speed region: n_f∈[0rpm,1500rpm]; High-speed range: n_f∈(1500rpm,n_max], where n_max is the rated maximum speed.

7. The method for detecting abnormal vibration of a smoke machine according to claim 1, characterized in that, In step S3, the vibration thresholds corresponding to different speed ranges include: Vibration threshold in the low-speed region: A_low = 8 mm / s²; Vibration threshold in the high-speed zone: A_high = 12 mm / s².

8. The method for detecting abnormal vibration of a smoke machine according to claim 1, characterized in that, Step S5, determining whether the rotational speed exceeds the limit, includes: Determine whether n(t) is greater than 1.2 × n_rated, where n_rated is the rated speed.

9. The method for detecting abnormal vibration of a smoke machine according to claim 8, characterized in that, Step S5 involves activating the speed reduction protection, which includes forcibly reducing the speed to 0.8×n_rated.

10. An oil fume treatment device, characterized in that, The fume treatment equipment adopts the fume machine vibration abnormal detection method as described in any one of claims 1-9.

Images