Fan system monitoring method, medium and extractor hood

Abstract

The present application relates to a kind of fan system monitoring method, medium and extractor hood, by detecting the position offset set of each side motor mounting bracket in axial when motor is operated at current rotating speed in preset operation time period, find the maximum value of position offset in each position offset set and corresponding maximum offset position point, obtain the distance between maximum offset position point on each side motor mounting bracket and corresponding preset arc segment center point, once any distance is greater than preset distance threshold, determine that motor mounting bracket exists fracture risk;Otherwise, obtain motor current excitation frequency and the inherent frequency of any side motor mounting bracket, obtain motor mounting bracket structural strength current value;Motor mounting bracket structural strength current value is less than or equal to preset motor mounting bracket structural strength threshold, determine that motor mounting bracket does not exist jitter abnormal sound risk;Otherwise, determine that motor mounting bracket exists jitter abnormal sound risk, to realize the real-time detection of fan system structural strength.

Description

Technical Field

[0001] This invention relates to the field of range hoods, and more particularly to a method for monitoring a fan system, a medium, and a range hood. Background Technology

[0002] A range hood, also known as a cooking hood, is installed above the kitchen stove to quickly remove harmful cooking fumes and vent them outdoors. With the continuous improvement of people's living standards, range hoods have become an indispensable household appliance in the kitchen. However, range hoods typically generate noise during operation, affecting the user experience.

[0003] In the structure of a range hood, the fan system is the core power component. The fan system includes components such as the volute, impeller, and motor. The motor is the power source for the fan system. The impeller is mounted on the motor shaft, and the motor is connected to the rear cover of the volute via a motor mounting bracket. The motor mounting bracket is welded to the rear plate of the volute. The structural strength of the motor mounting bracket represents the structural strength of the entire fan system. The structural strength of this fan system not only affects product performance but also the amount of noise. The greater the structural strength, the less resistant the system is to deformation; weaker structural strength results in weaker resistance to deformation. If the structural strength of the fan system, specifically the motor mounting bracket, is weak, the entire range hood will vibrate significantly after the volute is assembled, thus reducing the user experience.

[0004] Chinese utility model patent CN215521396U discloses a motor bracket for a centrifugal fan and a centrifugal fan using the same. The bracket is installed at the air inlet of a volute casing. The motor bracket includes: two strip-shaped support plates, arranged side-by-side at intervals, for connecting to opposite sides of the outer circumference of the motor; and at least two support frames, each corresponding to one of the two strip-shaped support plates. Each support frame has a first end for connecting to the volute casing and a second end for connecting to the strip-shaped support plates. This design improves the strength of the motor bracket and effectively reduces the impact on the airflow into the fan, thereby improving the operational stability of the fan system.

[0005] However, the fan structure scheme in the aforementioned utility model patent CN215521396U has shortcomings: it cannot detect the structural strength of the operating fan system in real time, so as to avoid the impact of fan system vibration in advance. Summary of the Invention

[0006] The first technical problem this invention aims to solve is to provide a wind turbine system monitoring method that addresses the aforementioned limitations of the prior art. This wind turbine system monitoring method can perform real-time detection of the structural strength of the wind turbine system during operation, thereby proactively mitigating the impact of vibrations in the wind turbine system.

[0007] The second technical problem to be solved by the present invention is to provide a readable storage medium for implementing the above-described wind turbine system monitoring method.

[0008] The third technical problem to be solved by the present invention is to provide a range hood that applies the above-mentioned fan system monitoring method.

[0009] The technical solution adopted by this invention to solve the first technical problem is: a wind turbine system monitoring method, characterized in that it includes:

[0010] Step 1: During a preset time period when the range hood motor is running at the current speed, detect the first set of axial position offsets of the left motor mounting bracket and the second set of axial position offsets of the right motor mounting bracket of the fan system.

[0011] Step 2: Find the maximum position offset in the detected first position offset set and the position point on the left motor mounting bracket after the maximum offset corresponding to the maximum position offset; and find the maximum position offset in the detected second position offset set and the position point on the right motor mounting bracket after the maximum offset corresponding to the maximum position offset.

[0012] Step 3: Calculate the first distance between the maximum offset position point on the left motor mounting bracket and the center point of the left preset arc segment, and the second distance between the maximum offset position point on the right motor mounting bracket and the center point of the right preset arc segment; wherein, the center point of the left preset arc segment is the center point of the arc-shaped connecting segment formed between the two motor mounting holes on the left motor mounting bracket, and the center point of the right preset arc segment is the center point of the arc-shaped connecting segment formed between the two motor mounting holes on the right motor mounting bracket;

[0013] Step 4: Make a judgment based on the obtained first and second distances:

[0014] If both the first distance and the second distance are less than the preset distance threshold, proceed to step 5; otherwise, determine that the motor mounting bracket with a distance greater than or equal to the preset distance threshold is at risk of breakage.

[0015] Step 5: Obtain the current excitation frequency of the motor when it is running at the current speed, as well as the natural frequency of either the left motor mounting bracket or the right motor mounting bracket.

[0016] Step 6: Based on the relationship between the current excitation frequency and the natural frequency, obtain the current value of the structural strength of the motor mounting bracket at the current speed for any given motor mounting bracket.

[0017] Step 7: Perform a judgment process based on the current value of the obtained motor mounting bracket structural strength and the preset motor mounting bracket structural strength threshold.

[0018] When the current value of the obtained motor mounting bracket structural strength is less than or equal to the preset motor mounting bracket structural strength threshold, it is determined that there is no risk of vibration or abnormal noise for any motor mounting bracket at present; otherwise, it is determined that there is a risk of vibration or abnormal noise for any motor mounting bracket at present.

[0019] Improvedly, in the wind turbine system monitoring method, after determining that there is a risk of breakage in the motor mounting bracket, a breakage risk warning operation is performed; or / and, when it is determined that there is no risk of vibration or abnormal noise in any of the current motor mounting brackets, the motor is allowed to continue running at the current speed; when it is determined that there is a risk of vibration or abnormal noise in any of the current motor mounting brackets, a vibration or abnormal noise risk warning operation is performed.

[0020] In a further improvement, the current value of the structural strength of any motor mounting bracket in the wind turbine system monitoring method is calculated as follows:

[0021]

[0022] δ0≠0;

[0023] ω=2πf1,

[0024] A i =|L i1 -L i2 |·Y

[0025] in:

[0026] k represents the current structural strength of any motor mounting bracket at the current speed, and E represents Young's modulus. This indicates the strain value of the preset arc segment on the left. This represents the strain value of the preset arc segment on the right, δ. leq δ represents the average axial displacement change of the left and right motor mounting brackets. 1,max δ represents the maximum position offset in the first set of position offsets. 2,max This represents the maximum position offset in the second set of position offsets, where δ0 is the preset displacement change; L q1 L is the arc length of the preset arc segment on the left. q2 The arc length of the preset arc segment on the right; || represents taking the distance value, L 11 Indicates the position of the first motor mounting hole on the left motor mounting bracket, L 12 Indicates the position of the second motor mounting hole on the left motor mounting bracket, L O1The center point of the preset arc segment on the left; L 21 Indicates the position of the first motor mounting hole on the right-hand motor mounting bracket, L 22 Indicates the position of the second motor mounting hole on the right motor mounting bracket, L O2 The center point of the preset arc segment on the right;

[0027] ω is the current speed of the motor, m is the total weight of the motor and impeller, and c is the damping of the vibration isolation pad installed on any of the motor mounting brackets. The axial torsion parameter value of the left motor mounting bracket is the average of the axial torsion parameter values ​​of the right motor mounting bracket; N is the total number of assembly clearances between the motor flange and the two motor mounting brackets, h n θ is the nth assembly gap value between the motor flange and the two motor mounting brackets; θ is the radian of any one of the preset arc segments on the left and right sides; and r is the radius of the arc of any one of the motor mounting brackets.

[0028] k0 represents the structural strength of any motor mounting bracket when the motor is stationary, and F m Let S1 be the axial force exerted by the motor on any of the motor mounting brackets, S2 be the projected area of ​​the end of the left motor mounting bracket on the rear cover of the volute, and A be the projected area of ​​the end of the right motor mounting bracket on the rear cover of the volute. i L is the projected area of ​​the motor flange on either the left or right motor mounting bracket. i1 L represents the position of the first motor mounting hole on either the left or right motor mounting bracket. i2 For L i1 The position of the second motor mounting hole on the motor mounting bracket, || represents the distance value, and Y is the cross-sectional width of the main body area of ​​any motor bracket.

[0029] Furthermore, in the wind turbine system monitoring method, when the acquired current excitation frequency is equal to the natural frequency, the following processing is performed:

[0030] Step a1: Compare the current value of the structural strength of any given motor mounting bracket with the preset structural strength threshold of the motor mounting bracket for judgment.

[0031] If the current value of the structural strength of the motor mounting bracket is less than the preset structural strength threshold of the motor mounting bracket, proceed to step a2; otherwise, proceed to step a3.

[0032] Step a2: Adjust the motor speed and use the adjusted motor speed as the current motor speed, then proceed to step 1;

[0033] Step a3: Adjust the damping of the vibration isolation pads installed on any one of the motor mounting brackets, and after adjusting the damping of the vibration isolation pads, proceed to step a4.

[0034] Step a4: Compare and judge the structural strength of the motor mounting bracket after the damping adjustment of the vibration isolation pad with the preset structural strength threshold of the motor mounting bracket again.

[0035] When the structural strength of the motor mounting bracket is a preset multiple of the preset structural strength threshold of the motor mounting bracket, the latest value of the structural strength of any motor mounting bracket is calculated, and the latest value of the structural strength of any motor mounting bracket is used as the current value of the structural strength of any motor mounting bracket.

[0036] Improvedly, in the fan system monitoring method, the adjusted motor speed is calculated in step a2 as follows:

[0037] R' j = (1+α·D)·R j ; 0 < α < 30%;

[0038] Among them, R' j R is the adjusted motor speed. j α represents the motor speed before adjustment, α represents the adjustment percentage, and D represents the number of times the motor speed is adjusted.

[0039] In a further improvement, in the wind turbine system monitoring method, in step a3, after adjusting the damping of the vibration isolation pad, the preload force on the motor fixing screw corresponding to the vibration isolation pad is F'; where F'=(1+β·B)·F; F is the preload force on the motor fixing screw corresponding to the vibration isolation pad before the damping of the vibration isolation pad is adjusted, B is the number of times the damping of the vibration isolation pad is adjusted, β is the percentage of preload adjustment, 60%<β<100%.

[0040] Further improved, in the wind turbine system monitoring method, in step a4, the latest value of the structural strength of any motor mounting bracket is calculated as follows:

[0041]

[0042] Where k' is the latest structural strength value of the motor mounting bracket, and c' is the adjusted damping value of the vibration isolation pad.

[0043] The technical solution adopted by the present invention to solve the second technical problem is: a readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the wind turbine system monitoring method described in any one of the claims.

[0044] The technical solution adopted by the present invention to solve the third technical problem is: a range hood, characterized in that it applies any of the fan system monitoring methods described in the present invention.

[0045] Compared with the prior art, the advantages of the present invention are as follows:

[0046] First, the fan system monitoring method of this invention sets the axial positional offsets of the motor mounting brackets on each side of the range hood motor during a preset operating time period at the current speed. It then finds the maximum positional offset and the corresponding maximum offset position point in each offset set, thereby obtaining the distance between the maximum offset position point on each motor mounting bracket and the center point of the corresponding preset arc segment. If any distance exceeds a preset distance threshold, the motor mounting bracket corresponding to that distance is deemed to have a risk of breakage. Otherwise, the current excitation frequency of the motor and the natural frequency of any motor mounting bracket are obtained, and then processed to obtain the current structural strength value of the motor mounting bracket at the current speed. If the current structural strength value is less than or equal to the preset structural strength threshold, the motor mounting bracket on that side is deemed to have no risk of vibration or abnormal noise; otherwise, the motor mounting bracket on that side is deemed to have a risk of vibration or abnormal noise. In this way, real-time detection of the structural strength of the range hood fan system can be achieved.

[0047] Secondly, the wind turbine system monitoring method of this invention can also adjust the real-time value of the structural strength of the motor mounting bracket by adjusting the motor speed and the damping of the vibration isolation pads set on the motor mounting bracket, so that the structural strength of the motor mounting bracket after adjustment will not have the risk of vibration. Attached Figure Description

[0048] Figure 1 This is a partial structural diagram of a range hood in an embodiment of the present invention.

[0049] Figure 2 This is a flowchart illustrating the wind turbine system monitoring method in an embodiment of the present invention. Detailed Implementation

[0050] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0051] This embodiment provides a method for monitoring the fan system of a range hood. See also: Figure 1As shown, in this embodiment of the range hood, the motor mounting bracket consists of a left motor mounting bracket 1 and a right motor mounting bracket 2. The two ends of the left motor mounting bracket 1 and the two ends of the right motor mounting bracket 2 are respectively fixed to the rear cover 3 of the volute. The left motor mounting bracket 1 is provided with a first motor mounting hole 11 and a second motor mounting hole 12, and the right motor mounting bracket 2 is provided with a first motor mounting hole 21 and a second motor mounting hole 22. Each motor mounting hole corresponds one-to-one with the mounting hole on the motor flange 4. The assembly gap between the motor flange 4 and the left motor mounting bracket 1 is marked as h1, the assembly gap between the motor flange 4 and the right motor mounting bracket 2 is marked as h2, the length of the left motor mounting bracket 1 is marked as L1, the length of the right motor mounting bracket 2 is marked as L2, and L1 = L2.

[0052] For the left motor mounting bracket 1, the position point of the first motor mounting hole 11 on the motor mounting bracket is marked as L11, and the position point of the second motor mounting hole 12 on the motor mounting bracket is marked as L12; the arc-shaped connecting segment formed between position point L11 and position point L12 is marked as C1, and the length of the arc-shaped connecting segment C1 is marked as Lq1; the center point of the arc-shaped connecting segment C1 is marked as LO1, and the arc radius of the arc-shaped connecting segment C1 is marked as r; similarly, the arc radius of the arc-shaped connecting segment C2 is also r;

[0053] For the right-side motor mounting bracket 1, the position point of the first motor mounting hole 21 on the motor mounting bracket is marked as L21, and the position point of the second motor mounting hole 22 on the motor mounting bracket is marked as L22; the arc-shaped connecting segment formed between position point L21 and position point L22 is marked as C2, the length of the arc-shaped connecting segment C2 is marked as Lq2, the center point of the arc-shaped connecting segment C2 is marked as LO2, and the radius of the arc of the arc-shaped connecting segment C2 is marked as r.

[0054] Specifically, see Figure 2 As shown, the wind turbine system monitoring method of this embodiment includes the following steps:

[0055] Step 1: Within a preset time period during which the range hood motor operates at its current speed, detect the first set of axial position offsets of the left motor mounting bracket and the second set of axial position offsets of the right motor mounting bracket; where the axial direction refers to the direction of the axis of symmetry between the two motor mounting brackets. Figure 1 The direction of the straight line yy' in the middle;

[0056] For example, the current speed of the range hood motor is R. j The motor operates at its current speed R jThe preset time period for operation is T; the set of offsets of the first axial position of the left motor mounting bracket, obtained after testing, is denoted as S. δ,1 S δ,1 ={δ 11 ,δ 12 ,…,δ 1N The set of axial offsets of the second position of the right-side motor mounting bracket is denoted as S. δ,2 S δ,2 ={δ 21 ,δ 22 ,…,δ 2N}; N is the total number of position offsets in the first position offset set, δ 1N For the Nth position offset in the first set of position offsets, δ 2N This is the Nth position offset in the second set of position offsets;

[0057] Step 2: Find the maximum position offset in the detected first position offset set and the position point on the left motor mounting bracket after the maximum offset corresponding to the maximum position offset; and find the maximum position offset in the detected second position offset set and the position point on the right motor mounting bracket after the maximum offset corresponding to the maximum position offset.

[0058] Suppose that after searching, the first position offset set S δ,1 The maximum position offset in the middle is marked as δ 18 The second position offset set S δ,2 The maximum position offset in the middle is marked as δ 29 And set the maximum offset δ at that position. 18 The position point corresponding to the maximum offset on the left motor mounting bracket is marked as O1, and the maximum offset value δ of this position is recorded. 29 The position point corresponding to the maximum offset on the right motor mounting bracket is marked as O2;

[0059] Step 3: Calculate the first distance between the maximum offset position point on the left motor mounting bracket and the center point of the left preset arc segment, and the second distance between the maximum offset position point on the right motor mounting bracket and the center point of the right preset arc segment; wherein, the center point of the left preset arc segment is the center point of the arc-shaped connecting segment formed between the two motor mounting holes on the left motor mounting bracket, and the center point of the right preset arc segment is the center point of the arc-shaped connecting segment formed between the two motor mounting holes on the right motor mounting bracket;

[0060] The left-side preset arc segment is the circular arc connecting segment C1, and the center point of this left-side preset arc segment is LO1;

[0061] The preset arc segment on the right is the arc-shaped connecting segment C2, and the center point of the preset arc segment on the right is LO2;

[0062] Then, the first distance is labeled as d1, d1 = |O1 - LO1|; the second distance is labeled as d2, d2 = |O2 - LO2|;

[0063] Step 4: Make a judgment based on the obtained first and second distances:

[0064] If both the first distance and the second distance are less than the preset distance threshold, proceed to step 5; otherwise, determine that the motor mounting bracket with a distance greater than or equal to the preset distance threshold is at risk of breakage.

[0065] Assume the preset distance threshold here is d. TH Once the first distance d1 <d TH And the second distance d2 <d TH Then proceed to step 5; once either the first distance d1 or the second distance d2 is greater than or equal to the preset distance threshold d TH If any distance value is considered, then the motor mounting bracket on the corresponding side is at risk of breakage.

[0066] Step 5: Obtain the current excitation frequency of the motor when it is running at the current speed, as well as the natural frequency of either the left motor mounting bracket or the right motor mounting bracket.

[0067] For example, in this embodiment, the motor speed R is obtained at the current speed. j The current excitation frequency during runtime is f. j And the natural frequency of either the left motor mounting bracket or the right motor mounting bracket is f; wherein, in this embodiment, it is assumed that the natural frequency f1 of the left motor mounting bracket and the natural frequency f2 of the right motor mounting bracket are the same, and both are f, that is, f1=f2=f;

[0068] Step 6: Based on the relationship between the current excitation frequency and the natural frequency, obtain the current value of the structural strength of the motor mounting bracket at the current speed; for example, assume that the obtained value of the motor mounting bracket at the current speed R... j The current value of the structural strength of the motor mounting bracket is marked as k.

[0069] Step 7: Perform a judgment process based on the current value of the obtained motor mounting bracket structural strength and the preset motor mounting bracket structural strength threshold.

[0070] When the current value of the obtained motor mounting bracket structural strength is less than or equal to the preset motor mounting bracket structural strength threshold, it is determined that there is no risk of vibration or abnormal noise for any motor mounting bracket at present; otherwise, it is determined that there is a risk of vibration or abnormal noise for any motor mounting bracket at present.

[0071] For example, suppose the preset motor mounting bracket structural strength threshold set in this embodiment is marked as k. γ Then, once the current value k of the structural strength of any motor mounting bracket is less than or equal to the preset structural strength threshold k of the motor mounting bracket... γ When, i.e., k≤k γ At that time, it is determined that there is no risk of vibration or abnormal noise from any motor mounting bracket; of course, once the current structural strength value k of any motor mounting bracket exceeds k... γ It was determined that any of the current motor mounting brackets posed a risk of vibration and abnormal noise.

[0072] To address the risk of motor mounting bracket breakage, the wind turbine system monitoring method in this embodiment further includes performing a breakage risk warning operation after determining that any motor mounting bracket has a breakage risk; or / and, when determining that the current motor mounting bracket does not have a vibration or abnormal noise risk, allowing the motor to continue running at the current speed; and when determining that the current motor mounting bracket has a vibration or abnormal noise risk, performing a vibration or abnormal noise risk warning operation.

[0073] It should be noted that, in this embodiment, any of the motor mounting brackets in step 6 above is at the current speed R. j The calculation method for the current value k of the structural strength of the motor mounting bracket is as follows:

[0074]

[0075] δ0≠0;

[0076] ω=2πf1,

[0077] A i =|L i1 -L i2 |·Y

[0078] in:

[0079] k represents the current structural strength of the motor mounting bracket at the current speed, and E represents Young's modulus. This indicates the strain value of the preset arc segment on the left. This represents the strain value of the preset arc segment on the right, δ. leqδ represents the average axial displacement change of the left and right motor mounting brackets. 1,max δ represents the maximum position offset in the first set of position offsets. 2,max This represents the maximum position offset in the second position offset set, where δ0 is the preset displacement change; L q1 L is the arc length of the preset arc segment on the left. q2 The arc length of the preset arc segment on the right; || indicates taking the distance value, L 11 Indicates the position of the first motor mounting hole on the left motor mounting bracket, L 12 Indicates the position of the second motor mounting hole on the left motor mounting bracket, L O1 L is the center point of the preset arc segment on the left. 21 Indicates the position of the first motor mounting hole on the right-hand motor mounting bracket, L 22 Indicates the position of the second motor mounting hole on the right motor mounting bracket, L O2 The center point of the preset arc segment on the right;

[0080] ω is the current speed of the motor, m is the total weight of the motor and impeller, and c is the damping of the vibration isolation pad installed on any motor mounting bracket; The axial torsion parameter value of the left motor mounting bracket is the average of the axial torsion parameter values ​​of the right motor mounting bracket; N is the total number of assembly clearances between the motor flange and the two motor mounting brackets, h n The nth assembly gap value between the motor flange and the two motor mounting brackets; θ is the radian of any preset arc segment between the left and right preset arc segments, and r is the radius of the arc of any motor mounting bracket;

[0081] k0 represents the structural strength of any motor mounting bracket when the motor is stationary, and F m S1 represents the axial force exerted by the motor on the motor mounting bracket, S2 represents the projected area of ​​the end of the left motor mounting bracket on the rear cover of the volute, and A represents the projected area of ​​the end of the right motor mounting bracket on the rear cover of the volute. i L is the projected area of ​​the motor flange on either the left or right motor mounting bracket. i1 L represents the position of the first motor mounting hole on either the left or right motor mounting bracket. i2 For L i1 The position of the second motor mounting hole on the motor mounting bracket, || represents the distance value, and Y is the cross-sectional width of the main body area of ​​any motor bracket.

[0082] It should be further explained that, in this embodiment, when the current excitation frequency f is obtained...j When the frequency is equal to the natural frequency f, the following processing is performed:

[0083] Step a1: Compare the current value of the structural strength of any given motor mounting bracket with the preset structural strength threshold of the motor mounting bracket for judgment.

[0084] If the current value of the structural strength of any motor mounting bracket is less than the preset structural strength threshold of the motor mounting bracket, proceed to step a2; otherwise, proceed to step a3.

[0085] Step a2: Adjust the motor speed, and use the adjusted motor speed as the current motor speed, then proceed to step 1; wherein, in this embodiment, the adjusted motor speed is calculated as follows:

[0086] R' j = (1+α·D)·R j ; 0 < α < 30%;

[0087] Among them, R' j R is the adjusted motor speed. j The motor speed before adjustment is α, the adjustment percentage is D, and the number of times the motor speed is adjusted is D.

[0088] Step a3: Adjust the damping of the vibration isolation pads installed on any one of the motor mounting brackets, and after adjusting the damping of the vibration isolation pads, proceed to step a4; wherein, in this embodiment, after adjusting the damping of the vibration isolation pads, the preload force on the motor fixing screws corresponding to the vibration isolation pads is F', F'=(1+β·B)·F; F is the preload force on the motor fixing screws corresponding to the vibration isolation pads before the damping of the vibration isolation pads is adjusted, B is the number of times the damping of the vibration isolation pads is adjusted, β is the percentage of preload adjustment, 60%<β<100%;

[0089] Step a4: Compare and judge the structural strength of the motor mounting bracket after the damping adjustment of the vibration isolation pad with the preset structural strength threshold of the motor mounting bracket again.

[0090] When the structural strength of the motor mounting bracket is a preset multiple of a preset threshold for the structural strength of the motor mounting bracket, the latest value of the structural strength of any given motor mounting bracket is calculated, and this latest value is used as the current value of the structural strength of any given motor mounting bracket. In this embodiment, the latest value of the structural strength of any given motor mounting bracket is calculated as follows:

[0091]

[0092] Where k' is the latest structural strength value of the motor mounting bracket, and c' is the adjusted damping value of the vibration isolation pad.

[0093] This embodiment also provides a readable storage medium. Specifically, the readable storage medium stores a computer program, which, when executed by a processor, implements the aforementioned wind turbine system monitoring method.

[0094] This embodiment also provides a range hood. The range hood utilizes the aforementioned fan system monitoring method.

[0095] Although preferred embodiments of the present invention have been described in detail above, it should be clearly understood that various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for monitoring a wind turbine system, characterized in that, include: Step 1: During a preset time period when the range hood motor is running at the current speed, detect the first set of axial position offsets of the left motor mounting bracket and the second set of axial position offsets of the right motor mounting bracket of the fan system. Step 2: Find the maximum position offset in the detected first position offset set and the position point on the left motor mounting bracket after the maximum offset corresponding to the maximum position offset; and find the maximum position offset in the detected second position offset set and the position point on the right motor mounting bracket after the maximum offset corresponding to the maximum position offset. Step 3: Calculate the first distance between the maximum offset position point on the left motor mounting bracket and the center point of the left preset arc segment, and the second distance between the maximum offset position point on the right motor mounting bracket and the center point of the right preset arc segment; wherein, the center point of the left preset arc segment is the center point of the arc-shaped connecting segment formed between the two motor mounting holes on the left motor mounting bracket, and the center point of the right preset arc segment is the center point of the arc-shaped connecting segment formed between the two motor mounting holes on the right motor mounting bracket; Step 4: Make a judgment based on the obtained first and second distances: If both the first distance and the second distance are less than the preset distance threshold, proceed to step 5; otherwise, determine that the motor mounting bracket with a distance greater than or equal to the preset distance threshold is at risk of breakage. Step 5: Obtain the current excitation frequency of the motor when it is running at the current speed, as well as the natural frequency of either the left motor mounting bracket or the right motor mounting bracket. Step 6: Based on the relationship between the current excitation frequency and the natural frequency, obtain the current value of the structural strength of the motor mounting bracket at the current speed for any given motor mounting bracket. Step 7: Perform a judgment process based on the current value of the obtained motor mounting bracket structural strength and the preset motor mounting bracket structural strength threshold. When the current value of the obtained motor mounting bracket structural strength is less than or equal to the preset motor mounting bracket structural strength threshold, it is determined that there is no risk of vibration or abnormal noise for any motor mounting bracket at present; otherwise, it is determined that there is a risk of vibration or abnormal noise for any motor mounting bracket at present.

2. The wind turbine system monitoring method according to claim 1, characterized in that, If a motor mounting bracket is determined to have a risk of breakage, a breakage risk warning operation is performed; or / and, if it is determined that there is no risk of vibration or abnormal noise from any of the current motor mounting brackets, the motor is allowed to continue running at the current speed; if it is determined that there is a risk of vibration or abnormal noise from any of the current motor mounting brackets, a vibration or abnormal noise risk warning operation is performed.

3. The wind turbine system monitoring method according to claim 1, characterized in that, The current value of the structural strength of any motor mounting bracket is calculated as follows: δ0≠0; ω=2πf1, HAS i =|L i1 -L i2 |·Y in: k is the current value of the motor mounting bracket structure strength of the any one motor mounting bracket at the current rotating speed, E is the Young's modulus, χ LO1 represents the strain value of the left preset arc segment, χ LO2 represents the strain value of the right preset arc segment, δ leq represents the average value of the axial displacement change of the left motor mounting bracket and the right motor mounting bracket, δ 1,max represents the maximum value of the position offset in the first position offset set, δ 2,max represents the maximum value of the position offset in the second position offset set, δ0 is a preset displacement change; L q1 is the arc length of the left preset arc segment, L q2 is the arc length of the right preset arc segment; || represents the distance value, L 11 represents the position of the first motor mounting hole on the left motor mounting bracket, L 12 represents the position of the second motor mounting hole on the left motor mounting bracket, L O1 is the center point of the left preset arc segment; L 21 represents the position of the first motor mounting hole on the right motor mounting bracket, L 22 represents the position of the second motor mounting hole on the right motor mounting bracket, L O2 is the center point of the right preset arc segment; ω is the current speed of the motor, m is the total weight of the motor and impeller, and c is the damping of the vibration isolation pad installed on any of the motor mounting brackets. The axial torsion parameter value of the left motor mounting bracket is the average of the axial torsion parameter values ​​of the right motor mounting bracket; N is the total number of assembly clearances between the motor flange and the two motor mounting brackets, h n θ is the nth assembly gap value between the motor flange and the two motor mounting brackets; θ is the radian of any preset arc segment between the left preset arc segment and the right preset arc segment; and r is the radius of the arc of any motor mounting bracket. k0 represents the structural strength of any motor mounting bracket when the motor is stationary, and F m Let S1 be the axial force exerted by the motor on either motor mounting bracket, S2 be the projected area of ​​the end of the left motor mounting bracket on the rear cover of the volute, and A be the projected area of ​​the end of the right motor mounting bracket on the rear cover of the volute. i L is the projected area of ​​the motor flange on either the left or right motor mounting bracket. i1 L represents the position of the first motor mounting hole on either the left or right motor mounting bracket. i2 For L i1 The position of the second motor mounting hole on the motor mounting bracket, || represents the distance value, and Y is the cross-sectional width of the main body area of ​​any motor bracket.

4. The wind turbine system monitoring method according to claim 3, characterized in that, Also includes: When the current excitation frequency is equal to the natural frequency, the following processing is performed: Step a1: Compare the current value of the structural strength of any given motor mounting bracket with the preset structural strength threshold of the motor mounting bracket for judgment. When the current value of the structural strength of the motor mounting bracket is less than the preset structural strength threshold of the motor mounting bracket, proceed to step a2; Otherwise, proceed to step a3; Step a2: Adjust the motor speed and use the adjusted motor speed as the current motor speed, then proceed to step 1; Step a3: Adjust the damping of the vibration isolation pads installed on any one of the motor mounting brackets, and after adjusting the damping of the vibration isolation pads, proceed to step a4. Step a4: Compare and judge the structural strength of the motor mounting bracket after the damping adjustment of the vibration isolation pad with the preset structural strength threshold of the motor mounting bracket again. When the structural strength of the motor mounting bracket is a preset multiple of the preset structural strength threshold of the motor mounting bracket, the latest value of the structural strength of any motor mounting bracket is calculated, and the latest value of the structural strength of any motor mounting bracket is used as the current value of the structural strength of any motor mounting bracket.

5. The wind turbine system monitoring method according to claim 4, characterized in that, In step a2, the adjusted motor speed is calculated as follows: R' j =(1+α·D)·R j ;0<α<30%; Among them, R' j R is the adjusted motor speed. j α represents the motor speed before adjustment, α represents the adjustment percentage, and D represents the number of times the motor speed is adjusted.

6. The wind turbine system monitoring method according to claim 4, characterized in that, In step a3, after adjusting the damping of the vibration isolation pad, the preload force on the motor fixing screw corresponding to the vibration isolation pad is F'; where F'=(1+β·B)·F; F is the preload force on the motor fixing screw corresponding to the vibration isolation pad before the damping of the vibration isolation pad is adjusted, B is the number of times the damping of the vibration isolation pad is adjusted, β is the percentage of preload adjustment, 60%<β<100%.

7. The wind turbine system monitoring method according to claim 4, characterized in that, In step a4, the latest structural strength value of any motor mounting bracket is calculated as follows: Where k' is the latest structural strength value of the motor mounting bracket, and c' is the adjusted damping value of the vibration isolation pad.

8. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the wind turbine system monitoring method according to any one of claims 1 to 6.

9. A range hood, characterized in that, The application is the wind turbine system monitoring method according to any one of claims 1 to 6.

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