CN113280469B - Fan blade fault detection method, air conditioner and computer readable storage medium - Google Patents
Fan blade fault detection method, air conditioner and computer readable storage medium Download PDFInfo
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- CN113280469B CN113280469B CN202110608956.XA CN202110608956A CN113280469B CN 113280469 B CN113280469 B CN 113280469B CN 202110608956 A CN202110608956 A CN 202110608956A CN 113280469 B CN113280469 B CN 113280469B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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Abstract
The invention provides a fan blade fault detection method, an air conditioner and a computer readable storage medium, wherein the method comprises the following steps: s1, the fan operates, and the operating current I (t) is detected in real time; s2, acquiring the current change slope A in unit time in real time; s3, judging whether A is larger than a first preset value; if yes, go to step S4; s4, judging whether A is larger than a second preset value; if yes, go to step S7; otherwise, go to step S5; s5, judging whether I (t) is larger than a third preset value; if yes, go to step S7; otherwise, go to step S6; s6, controlling the fan to continue to operate, and reporting the fan blade fracture fault; s7, controlling the fan to stop, reporting the fan blade fracture fault, and prompting the fan blade replacement; the invention can determine the condition of the fan blade fracture in time, improve the fault detection accuracy, protect the motor or other devices in time, avoid the damage of other parts of the air conditioner caused by the fan blade fracture fault and avoid additional loss to users.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a fan blade fault detection method, an air conditioner and a computer readable storage medium.
Background
The air conditioner is indispensable electrical equipment in people's daily life, has diversified structural style. With the continuous improvement of the industrial design level and the application of new processes, new materials, new shapes and new technologies to the air conditioner, not only various air conditioners are developed, but also the fault detection method of related components in the air conditioner is continuously optimized and improved.
Taking a fan failure in an outdoor unit of an air conditioner as an example, common fan failures include: the fan is failed to start, blocked and out of step, and the fan is short of the same, and the normal operation of the outdoor unit of the air conditioner is often influenced by the occurrence of the fan fault, so various motor protection methods are provided for the corresponding fan fault in the prior art, but the motor protection methods in the prior art are all used for protecting the performance of the motor, and preventing the motor from being damaged by overcurrent or incapable of working.
However, in the actual operation process of the air conditioner, a special fan fault, namely a fault that fan blades are broken, still exists. The fan blade fault is usually that the axis of the fan blade deviates from the rotating axis of the fan due to vibration, bolt looseness and other reasons, and the fan blade can be gradually broken due to unbalanced stress after long-time operation. After the fan blades are broken, if the fan blades influence the rotation of the rest fan blades, the blocking and rotating faults can be directly reported, and if the rotation of the fan is not influenced, the fan blades can continue to operate under the condition of unbalance, so that the motor is damaged. Meanwhile, the fan blade fault often occurs after the air conditioner is put into use, if the broken fan blade does not affect the rotation of the residual fan blades, the user often cannot find the broken condition of the fan blade in time, the fault which is not easy to be found by the user not only can seriously affect the performance of the air conditioner and is not beneficial to enhancing the use experience of the air conditioner of the user, but also can easily cause the imbalance of the fan blade after the individual fan blade is broken, and can cause the damage of a motor and the abnormal operation of the air conditioner when serious, thereby bringing greater loss to the user.
Disclosure of Invention
In view of this, the present invention is directed to a fan blade fault detection method, an air conditioner, and a computer readable storage medium, so as to solve the problem that it is difficult to detect the fan blade fracture condition in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a fan blade fault detection method comprises the following steps: s1, the fan operates, and the air conditioner detects the operating current I (t) in real time; s2, the air conditioner acquires the current change slope A in unit time in real time; s3, judging whether A is larger than a first preset value by the air conditioner; if yes, go to step S4; s4, judging whether A is larger than a second preset value by the air conditioner; if yes, go to step S7; otherwise, go to step S5; s5, judging whether the I (t) is greater than a third preset value by the air conditioner; if yes, go to step S7; otherwise, go to step S6; s6, controlling the fan to continue to operate by the air conditioner, and reporting the fan blade fracture fault; s7, controlling the fan to stop by the air conditioner, reporting the fan blade fracture fault and prompting the fan blade replacement; wherein, the current change slope A in unit time is the change quantity of the running current I (t) in unit time; the first preset value is a current distortion threshold value and is used for judging and sending out a condition for warning the rupture of the air blade; the second preset value is a current distortion shutdown threshold value and is used for judging the condition whether the fan needs to be shut down after the fan blade is broken; the third preset value is the maximum allowable working current of the motor in normal operation; thereby through setting up tertiary judgement process and the air conditioner that corresponds, the fan regulation and control condition, make the air conditioner can in time confirm the fan blade condition of breaking, on the other hand can the cracked severity of fan blade, the current peak value condition carries out analysis and judgment, not only is favorable to improving fan blade fault detection's rate of accuracy, can in time protect other devices of motor or air conditioner in addition, continue to cause the damage of the all the other parts of air conditioner after avoiding the fan blade fracture trouble, avoid causing extra loss for the user.
Further, step S6 includes: s61, the air conditioner continuously obtains the current change slope A in unit time in real time; s62, judging whether the A meets a first judgment condition by the air conditioner; if yes, go to step S63; if not, go to step S64; s63, directly shutting down the air conditioner, reporting a fan blade fracture fault, and forbidding the fan to restart; and S64, controlling the fan to continue to operate by the air conditioner, and reporting the fan blade fracture fault. Wherein the first determination condition includes: a is greater than the second preset value, or A is less than the first preset value. Therefore, through the step S6, on one hand, under the condition that the fan blade fracture condition is not serious and the current peak value is within the allowable working current range, the fan is kept to continue to operate on the basis of reporting the fan blade fracture fault, so that the air conditioner can guarantee the use requirement of a user as much as possible and the use experience of the user is enhanced; on the other hand makes the air conditioner judge "the fan blade fracture condition is not serious and can continue to operate the fan" under the condition, can continuously monitor the fan operation condition, in time shut down after A satisfies first judgement condition, this not only can carry out timely shutdown protection to the fan, can prevent devices such as compressor from appearing overload protection moreover to in time protect other devices of air conditioner, avoid causing the damage of all the other parts of air conditioner after the fan blade fracture trouble, avoid causing extra loss for the user.
Further, step S7 includes: s71, the air conditioner controls the fan to stop, and the stop frequency K of the fan is increased by one; s72, judging whether K is larger than or equal to a rated value by the air conditioner; if yes, clearing K, and performing step S73; if not, the air conditioner restarts the fan and returns to the step S1; and S73, the air conditioner prohibits the fan from restarting, reports the fan blade fracture fault and prompts the fan blade replacement. Wherein the nominal value is 2-4; therefore, through the step S7, after the air conditioner determines the conclusion of 'fan blade breakage fault and need to shut down the fan' for the first time, the air conditioner can continuously verify the determination conclusion, so that the accuracy of fan blade fault detection is ensured, and the occurrence of misjudgment is avoided.
Further, step S1 includes: s11, the fan operates, and the air conditioner acquires the rotating speed of the fan in real time; s12, judging whether the rotating speed of the fan reaches the target rotating speed by the air conditioner; if yes, go to step S13; otherwise, returning to step S11; s13, the air conditioner acquires the running current of the fan in real time, and calculates the fan current difference delta I in unit time; s14, judging whether the N times are continuous by the air conditioner, wherein the standard errors that delta I is smaller than I are met; if so, considering the current to be stable, and taking the fan running current acquired in real time as the running current I (t); otherwise, the process returns to step S13. Therefore, through the steps S11-S14, after the rotating speed of the fan reaches the target rotating speed, the change condition of the fan current in unit time is continuously analyzed and judged, so that not only is the stable operation of the fan ensured, but also the acquired operating current I (t) is ensured to be a more stable current value, the accuracy of data analysis and processing in the follow-up fan blade fault detection process is facilitated, the occurrence of misjudgment is reduced, and the accuracy of fan blade fault detection is improved.
Furthermore, the first preset value is 80% -95% of the second preset value, so that an air conditioner manufacturer can directly set the current distortion threshold value according to the second preset value obtained by experiments under the condition of keeping a certain margin.
An air conditioner comprises a computer readable storage medium and a processor, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and run by the processor, the fan blade fault detection method is realized.
A computer readable storage medium stores a computer program, and when the computer program is read and executed by a processor, the method for detecting the fan blade fault is realized.
Compared with the prior art, the fan blade fault detection method, the air conditioner and the computer readable storage medium have the following advantages:
according to the fan blade fault detection method, the air conditioner and the computer readable storage medium, through setting three-stage judgment processes and corresponding air conditioner and fan regulation and control conditions, on one hand, the air conditioner can determine the condition that the fan blade is broken in time, and on the other hand, the conditions of the severity degree of fan blade breakage, the current peak value and the like can be analyzed and judged, so that the fan blade fault detection accuracy rate can be improved, the motor or other devices of the air conditioner can be protected in time, the damage to other parts of the air conditioner caused by the broken fault of the fan blade is avoided, and the extra loss to a user is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a fan blade fault detection method according to an embodiment of the present invention.
Detailed Description
The inventive concepts of the present disclosure will be described hereinafter using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. These inventive concepts may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In the fan trouble of current air conditioner, the cracked trouble of fan blade often takes place after the air conditioner is put into use, if cracked fan blade does not influence the rotation of remaining fan blade, the user often is difficult to in time discover the fan blade fracture condition, this kind of trouble that is difficult for being discovered by the user, not only can seriously influence the performance of air conditioner, be unfavorable for strengthening user's air conditioner and use the impression, and after the fracture of individual fan blade, lead to the fan blade imbalance very easily, can cause the motor to damage when serious, the unable normal operating of air conditioner, bring bigger loss for the user.
In order to solve the problem that the fan blade fracture condition is difficult to detect in the prior art, the fan blade fault detection method is provided in the embodiment, and the applicant mainly considers that the fan running current is related to a plurality of factors, and under the same condition, the larger the rotational inertia is, the larger the torque required by the fan at the same rotating speed is, and the larger the current amplitude is. However, after the fan blade is broken, the rotational inertia may become large and may also become small, and specifically, the rotational inertia is related to the position of the axis of rotation of the broken fan blade. Therefore, the main judgement basis in this application is current change slope, also regards current amplitude as another basis in the fan blade fault detection process simultaneously.
Specifically, as shown in fig. 1, the detection method includes:
s1, operating the fan, and detecting the operating current I (t) in real time by the air conditioner;
in step S1, i (t) may be fan operating current, outdoor unit operating current, air conditioner overall operating current, or the like; preferably, I (t) is the fan operating current; meanwhile, for the acquisition of the relevant current of the air conditioner, a current detection device can be arranged in a relevant circuit, and the current detection technology can adopt the prior art and is not described herein any more.
Meanwhile, i (t) is preferably a steady current value; that is, for the acquisition process of i (t), step S1 includes:
s11, the fan operates, and the air conditioner acquires the rotating speed of the fan in real time;
s12, judging whether the rotating speed of the fan reaches the target rotating speed by the air conditioner; if yes, go to step S13; otherwise, returning to step S11;
s13, the air conditioner acquires the running current of the fan in real time, and calculates the fan current difference delta I in unit time;
after the fan reaches the target rotating speed, the peak current and the current effective value of the fan basically remain unchanged, and each gear of rotating speed of the fan can be regarded as corresponding to a current value. Meanwhile, if the air conditioner switches the target rotation speed in the process of performing the steps S12 to S14, the steps S12 to S14 may be re-performed on the basis of the new target rotation speed. Meanwhile, fan running current related data acquired by the air conditioner in the application can be stored by the air conditioner, and are all the prior art in the field in view of data storage and calling, and are not repeated.
For the acquisition of the delta I, after the fan reaches the target rotating speed, s represents the time when the fan reaches the target rotating speed, the fan operating current is recorded as I(s), and when the fan operating current is recorded in real time, the delta I is I (s +1) -I(s), namely I (s +1) is the fan operating current recorded after unit time.
S14, judging whether N times of continuous operation are performed by the air conditioner, wherein the conditions meet that delta I is less than IStandard error of(ii) a If so, considering the current to be stable, and taking the fan running current acquired in real time as the running current I (t); otherwise, the process returns to step S13.
In step S14, IStandard error ofThe fan current sampling error belongs to air conditioner preset parameters when the air conditioner leaves a factory, and in view of different fans, sampling circuits and the like, the error conditions are different, and specific values are not used for representing the error. N is a preset value when the air conditioner leaves a factory, and preferably, N is 2-10.
Therefore, through the steps S11-S14, after the rotating speed of the fan reaches the target rotating speed, the change condition of the fan current in unit time is continuously analyzed and judged, so that not only is the stable operation of the fan ensured, but also the acquired operating current I (t) is ensured to be a more stable current value, the accuracy of data analysis and processing in the follow-up fan blade fault detection process is facilitated, the occurrence of misjudgment is reduced, and the accuracy of fan blade fault detection is improved.
S2, the air conditioner acquires the current change slope A in unit time in real time;
similarly, the current change slope a per unit time can be regarded as the change amount of the operating current i (t) per unit time, for example: in the process of acquiring the operating current i (t) in real time, the current value at the time t is taken as i (t), and the current change slope a at the time t is i (t) -i (t-1), i.e. the difference value of the current value at the current time minus the current value at the previous unit time. Note that the current at the zero time is assumed to be zero by default.
S3, the air conditioner judges whether A is larger than a first preset value; if yes, go to step S4;
the first preset value is a current distortion threshold value, is used for judging and sending out a condition for warning the fan blade fracture, belongs to air conditioner preset parameters when an air conditioner leaves a factory, and is determined by air conditioner manufacturers through relevant experimental research; under the conditions of different air conditioners, different fans or different circuits and the like, the first preset value can be different, and the first preset value is not represented by a specific value. Meanwhile, step S3 is used as a first-stage judgment process, when A is larger than a first preset value, the fan blade is judged to be broken, and the severity of the fan blade breakage is further analyzed and judged through subsequent steps, so that the accuracy of fan blade fault detection is improved.
Further, step S3 includes:
s31, acquiring standard current data I by the air conditionerSign boardSlope A of change from standard currentSign boardJudging I (t)/ISign boardAnd A/ASign boardWhether all the conditions meet preset judgment conditions; if yes, go to step S1; otherwise, returning to step S32;
s32, judging whether A is larger than a first preset value by the air conditioner; if yes, go to step S4; otherwise, the process returns to step S1.
Wherein, the preset judging conditions are that the I (t)/I mark is between 0.95 and 1.05, and the A/A mark is between 0.95 and 1.05. The standard current data I standard and the standard current change slope A standard can be preset parameters of the air conditioner when the air conditioner leaves a factory, and are determined by air conditioner manufacturers through relevant experimental research; the current change slope and the running current data can be recorded and stored under the last normal and stable running state of the air conditioner. Thereby further according to the standard current data I in step S3Sign boardAnd the standard current change slope ASign boardJudging I (t) and A simultaneously, when the I (t) and the A do not meet the preset judgment condition, indicating that the fan current is distorted, and then, judging that the fan current is distorted through SAnd 32, determining whether the fan blade fracture occurs, and being beneficial to further improving the accuracy of the fan blade fracture determination.
S4, judging whether A is larger than a second preset value by the air conditioner; if yes, go to step S7; otherwise, go to step S5;
the second preset value is a current distortion shutdown threshold value, is used for judging whether the fan needs to be shut down after the fan blade is broken, belongs to air conditioner preset parameters when the air conditioner leaves a factory, and is determined by air conditioner manufacturers through relevant experimental research; the motor of the same model obtains a fixed current distortion shutdown threshold value through experiments, and the threshold value is a threshold value which can cause damage after the fan blade axis deviates from the rotating axis of the fan after the motor runs for a long time. Meanwhile, under the conditions of different air conditioners, different fans or different circuits and the like, the second preset value can be different, and specific values are not used for representing the second preset value.
However, under the condition of a specific air conditioner, a specific motor and a specific circuit, the second preset value is a fixed value obtained through an experiment, and the first preset value is set to be 80% -95% of the second preset value in the application, so that an air conditioner manufacturer can directly set the current distortion threshold value according to the second preset value obtained through the experiment under the condition of keeping a certain margin. Preferably, the first preset value is 0.9 × the second preset value, namely, the air conditioner is kept with 10% of margin, and is not stopped after reaching the current distortion threshold value, only a warning is sent, and the air conditioner is completely stopped after reaching the current distortion stop threshold value.
Therefore, after the air conditioner judges that the fan blade is broken, the step S4 is used as a second-stage judgment process, when A is larger than a second preset value, the fan blade is judged to be broken seriously, the motor is possibly damaged, the fan needs to be controlled to stop in time, the fan is prevented from being further damaged after the fan blade is broken, and the motor is protected in time.
S5, judging whether the I (t) is greater than a third preset value by the air conditioner; if yes, go to step S7; otherwise, go to step S6;
the third preset value is the maximum allowable working current of the normal operation of the motor, belongs to the performance parameters of the motor, is influenced by different models of the motor, and is different, and is not represented by specific values. For the fan, the torque determines the current peak value, and the motor coil is burnt out when the current peak value is too large; the current distortion determines the stability of the fan operation, and the larger the distortion is, the more easily the fan is out of step. If the fan blade fracture leads to fan running torque to grow. If the torque is too large, the current of the fan exceeds the allowable working current, and if the fan is kept to continuously operate at the moment, the coil inside the fan is easily burnt, so that the current needs to be limited, and the fan is shut down when the allowable working current is exceeded.
Therefore, after the air conditioner judges that the fan blade is broken through the first-stage judgment, and continues to judge that the fan blade breakage condition is not serious (namely A is not more than the second preset value) through the second-stage judgment, the step S5 is used as a third-stage judgment process, when I (t) is more than the third preset value, the judgment current peak value is too large, the internal coil of the fan is easily burnt, the fan needs to be controlled to stop in time, the motor is prevented from being burnt out, and the motor is protected in time.
S6, controlling the fan to continue to operate by the air conditioner, and reporting the fan blade fracture fault;
therefore, through the step S6, under the condition that the fan blade fracture condition is not serious and the current peak value is within the allowable working current range, the fan is kept to continue to operate on the basis of reporting the fan blade fracture fault, so that the air conditioner can guarantee the use requirement of a user as far as possible and the use experience of the user is enhanced.
Further, step S6 includes:
s61, the air conditioner continuously obtains the current change slope A in unit time in real time;
s62, judging whether the A meets a first judgment condition by the air conditioner; if yes, go to step S63; otherwise, go to step S64;
s63, directly shutting down the air conditioner, reporting a fan blade fracture fault, and forbidding the fan to restart;
and S64, controlling the fan to continue to operate by the air conditioner, and reporting the fan blade fracture fault.
The step S61 is identical to the relevant process of the step S2, the obtained parameters are identical, and only the time points of obtaining the parameters are different, which is not repeated. The first determination condition includes: a is greater than the second preset value, or A is less than the first preset value.
When the fan blade is broken and the fan current is distorted, the situation that the torque is not increased too much may exist; at the moment, the current of the fan is still in an allowable range, and the fan can be kept to continuously operate. However, if the current distortion of the fan is too serious and the current distortion is greater than the second preset value, the actual running state of the fan is too poor, and therefore the fan needs to be shut down and is prohibited from running so as to perform timely shutdown protection on the fan.
In addition, in the process that the fan drives the fan blades to rotate, due to the existence of centrifugal force, under the condition that the fan blades are broken, the current distortion value is reduced, the normal operation can be continued, but the situation that other fan blades of the fan blades are broken possibly due to the existence of centrifugal force, so that the axes of the fan blades and the rotating axes of the fan blades are coincided again; taking a common three-blade fan blade as an example, suppose that the fan blade only breaks 1 blade at first and can continue to operate by judging the fan, but in the process of continuing to operate the fan, the rotational center of the fan blade and the rotational center of the fan are not coaxial, so that unbalanced stress can occur, and the remaining 2 fan blades can be broken more easily. Once all 3 fan blades are broken, the rotation center of the fan blades can be coincided with the rotation center of the fan, so that the fan can rotate normally, and the current distortion can slowly disappear. In this case, the fan torque is reduced because the fan does not have any fan blade, and thus the corresponding fan current value is also reduced. However, the compressor needs to dissipate heat during refrigeration, and the fan cannot dissipate heat without the fan blades, so that the compressor can be quickly protected and shut down under the condition of overlarge pressure of a condenser loop. Therefore, after the A is larger than the first preset value, the air conditioner returns to the normal state again, namely the A is smaller than the first preset value again, the air conditioner needs to be directly stopped, the overload protection of devices such as a compressor is prevented, and other devices of the air conditioner are protected in time.
Therefore, through the specific process of the step S6, the air conditioner can continuously monitor the running condition of the fan under the condition that the fan blade fracture condition is not serious and the fan can continue to run, the air conditioner is shut down in time after the A meets the first judgment condition, the air conditioner can not only carry out the in-time shutdown protection on the fan, but also prevent the overload protection of devices such as a compressor and the like, and protect other devices of the air conditioner in time, the damage of other parts of the air conditioner caused after the fan blade fracture fault is avoided, and the extra loss caused to a user is avoided.
And S7, controlling the fan to stop by the air conditioner, reporting the fan blade fracture fault and prompting the fan blade replacement.
Further, step S7 includes:
s71, the air conditioner controls the fan to stop, and the stop frequency K of the fan is increased by one;
s72, judging whether K is larger than or equal to a rated value by the air conditioner; if yes, clearing K, and performing step S73; if not, the air conditioner restarts the fan and returns to the step S1;
and S73, the air conditioner prohibits the fan from restarting, reports the fan blade fracture fault and prompts the fan blade replacement.
The rated value is a preset value of an air conditioner leaving a factory, and is preferably 2-4; the air conditioner detects the power-on of the fan again after determining the fan blade fracture fault and shutting down the fan, and if the judgment that the air conditioner is judged for at least two times or more times to be the conclusion of 'the fan blade fracture fault and needing to shut down the fan', the step S73 is executed; therefore, through the step S7, after the air conditioner determines the conclusion of 'fan blade breakage fault and need to shut down the fan' for the first time, the air conditioner can continuously verify the determination conclusion, so that the accuracy of fan blade fault detection is ensured, and the occurrence of misjudgment is avoided.
Meanwhile, according to the fan blade fault detection method, through setting three-level judgment processes and corresponding air conditioners and fan regulation and control conditions, on one hand, the air conditioner can determine the condition that the fan blade is broken in time, on the other hand, the conditions such as the severity degree of fan blade breakage and the current peak value can be analyzed and judged, the fan blade fault detection accuracy can be improved, the motor or other devices of the air conditioner can be protected in time, the damage to other parts of the air conditioner caused by the continuation of the fan blade breakage fault is avoided, and extra loss caused to a user is avoided.
The invention also provides an air conditioner which adopts the fan blade fault detection method; the air conditioner comprises a computer readable storage medium and a processor, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read by the processor and runs, the fan blade fault detection method is realized. Meanwhile, the application also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and operated by a processor, the fan blade fault detection method is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A fan blade fault detection method is characterized by comprising the following steps:
s1, the fan operates, and the air conditioner detects the operating current I (t) in real time;
s2, the air conditioner acquires the current change slope A in unit time in real time;
s3, judging whether A is larger than a first preset value by the air conditioner; if yes, go to step S4;
s4, judging whether A is larger than a second preset value by the air conditioner; if yes, go to step S7; otherwise, go to step S5;
s5, judging whether the I (t) is greater than a third preset value by the air conditioner; if yes, go to step S7; otherwise, go to step S6;
s6, controlling the fan to continue to operate by the air conditioner, and reporting the fan blade fracture fault;
s7, controlling the fan to stop by the air conditioner, reporting the fan blade fracture fault and prompting the fan blade replacement;
step S6 includes:
s61, the air conditioner continuously obtains the current change slope A in unit time in real time;
s62, judging whether the A meets a first judgment condition by the air conditioner; if yes, go to step S63; otherwise, go to step S64;
s63, directly shutting down the air conditioner, reporting a fan blade fracture fault, and forbidding the fan to restart;
s64, controlling the fan to continue to operate by the air conditioner, and reporting the fan blade fracture fault;
wherein the first determination condition includes: a is greater than the second preset value, or A is less than the first preset value.
2. The fan blade fault detection method according to claim 1, wherein a current change slope a in unit time is a change amount of an operating current i (t) in unit time; the first preset value is a current distortion threshold value and is used for judging and sending out a condition for warning the rupture of the air blade; the second preset value is a current distortion shutdown threshold value and is used for judging the condition whether the fan needs to be shut down after the fan blade is broken; the third preset value is the maximum allowable working current of the motor in normal operation.
3. The fan blade fault detection method according to claim 1, wherein the step S7 includes:
s71, the air conditioner controls the fan to stop, and the stop frequency K of the fan is increased by one;
s72, judging whether K is larger than or equal to a rated value by the air conditioner; if yes, clearing K, and performing step S73; if not, the air conditioner restarts the fan and returns to the step S1;
and S73, the air conditioner prohibits the fan from restarting, reports the fan blade fracture fault and prompts the fan blade replacement.
4. The fan blade fault detection method according to claim 3, wherein the rated value is 2-4.
5. The fan blade fault detection method according to claim 1, wherein the step S1 includes:
s11, the fan operates, and the air conditioner acquires the rotating speed of the fan in real time;
s12, judging whether the rotating speed of the fan reaches the target rotating speed by the air conditioner; if yes, go to step S13; otherwise, returning to step S11;
s13, the air conditioner acquires the running current of the fan in real time, and calculates the fan current difference delta I in unit time;
s14, judging whether N times of continuous operation are performed by the air conditioner, wherein the conditions meet that delta I is less than IStandard error of(ii) a If so, considering the current to be stable, and taking the fan running current acquired in real time as the running current I (t); otherwise, the process returns to step S13.
6. The fan blade fault detection method according to claim 1, wherein the first preset value is 80% -95% of the second preset value.
7. An air conditioner, characterized by comprising a computer readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the fan blade fault detection method according to any one of claims 1 to 6.
8. A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is read and executed by a processor, the method for detecting a fan blade fault according to any one of claims 1 to 6 is implemented.
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| CN104870779A (en) * | 2013-02-22 | 2015-08-26 | 三菱重工业株式会社 | Compressor wheel and device for detecting unbalance in compressor assembly |
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| CN106870298B (en) * | 2017-03-28 | 2020-04-07 | 中车株洲电力机车研究所有限公司 | Blade root bolt fracture fault detection method based on machine learning |
| JP2019138603A (en) * | 2018-02-15 | 2019-08-22 | アイシン精機株式会社 | Fan motor control device for heat exchanger |
| CN109470409A (en) * | 2018-10-29 | 2019-03-15 | 青岛海信日立空调***有限公司 | A kind of detection device and method of fan leaf damage |
| CN109245634B (en) * | 2018-10-30 | 2021-12-07 | 铜仁职业技术学院 | Control method for variable-rotation-inertia permanent magnet synchronous motor |
| CN210265196U (en) * | 2019-06-12 | 2020-04-07 | 赣州市怡辰新能源开发有限公司 | Automatic detection device for fan faults |
| CN112301628A (en) * | 2020-09-16 | 2021-02-02 | 海信（山东）冰箱有限公司 | Washing machine and control method |
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| CN104870779A (en) * | 2013-02-22 | 2015-08-26 | 三菱重工业株式会社 | Compressor wheel and device for detecting unbalance in compressor assembly |
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