Centrifugal fan fault self-diagnosis method, computer equipment and storage medium

Abstract

The invention discloses a centrifugal fan fault self-diagnosis method, computer equipment and a storage medium. The centrifugal fan fault self-diagnosis method comprises the steps that vibration acceleration signals of centrifugal fan measuring points are acquired in real time; calculating a kurtosis value, a crest factor and a speed effective value of an acceleration waveform according to the vibration acceleration signal; responding to the condition that one of the kurtosis value, the crest factor and the speed effective value exceeds a corresponding threshold value, and acquiring a vibration amplitude Vmax of the maximum frequency and the resonance frequency of the equipment in the speed spectrum; judging whether the vibration amplitude Vmax of the maximum frequency is equal to the vibration amplitude under the resonance frequency of the equipment or not; if the first judgment result is yes, determining that the equipment has a resonance fault; when the first judgment result is no, acquiring the rotation frequency RPM of the equipment, and calculating the vibration amplitude V1 under the one-time rotation frequency on the speed frequency spectrum; and judging whether the vibration amplitude V1 under the doubled rotation frequency is greater than or equal to the vibration amplitude of K4 * Vrms or not.

Description

Technical Field

[0001] The present invention relates to the technical field of fault diagnosis, and in particular to a self-diagnosis method for centrifugal fan faults, a computer device, and a storage medium. Background Art

[0002] Centrifugal fans are one of the common industrial equipment. Due to wear or improper use during use, centrifugal fans often have various mechanical and bearing failures.

[0003] In the prior art, the fault diagnosis of centrifugal fan vibration mainly relies on manual analysis, which is more dependent on the personal experience of analysts. Analysts have different experiences, different analysis capabilities, and different fault judgment capabilities. In addition, some fault diagnosis fan vibration judgment methods are too single, and can only judge a few faults (such as 1-2 faults). It is impossible to accurately judge complex situations. Centrifugal fans have many faults, such as unbalanced impellers, misaligned couplings, damaged inner and outer rings of bearings, loose foundations, shaft wear, etc., which makes it impossible to accurately judge the specific faults of centrifugal fans.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present invention is to provide a self-diagnosis method for centrifugal fan faults, a computer device, and a storage medium, aiming to solve the above technical problems in the prior art.

[0006] To achieve the above object, the present invention provides a centrifugal fan fault self-diagnosis method, the centrifugal fan fault self-diagnosis method comprising:

[0007] Obtain the vibration acceleration signal of the centrifugal fan measuring point in real time;

[0008] According to the vibration acceleration signal, the kurtosis value, the crest factor, and the velocity effective value of the acceleration waveform are calculated;

[0009] In response to one of the kurtosis value, the crest factor, and the velocity effective value exceeding its corresponding threshold value, obtaining the vibration amplitude Vmax of the maximum frequency and the resonance frequency of the device in the velocity spectrum;

[0010] Determine whether the vibration amplitude Vmax of the maximum frequency is equal to the vibration amplitude at the resonant frequency of the equipment;

[0011] When the first judgment result is yes, it is determined that a resonance failure occurs in the device;

[0012] When the first judgment result is no, the RPM of the equipment is obtained, and the vibration amplitude V1 at 1 times the rotation frequency is calculated on the speed spectrum;

[0013] Determine whether the vibration amplitude V1 at 1 times the rotation frequency is greater than or equal to the vibration amplitude of K4*Vrms, where Vrms is the effective value of the speed and K4 is greater than or equal to 0.6;

[0014] When the second judgment result is yes, it is determined that an unbalanced fault occurs in the device;

[0015] When the second judgment result is no, determine whether the centrifugal fan is misaligned based on the vibration amplitude V1 at 1 times the rotation frequency, the vibration amplitude V2 at 2 times the rotation frequency, and the vibration amplitude K4*Vrms;

[0016] When the equipment is not misaligned, determine whether the centrifugal fan has loose foundation according to the vibration amplitudes {V1, V2, ... Va1, ..., Vb1} at each rotation frequency and the vibration amplitude of K4*Vrms, where a1 is an integer and b1 is an integer greater than 10;

[0017] When the foundation of the equipment is not loose, determine whether the centrifugal fan has shaft wear based on the vibration amplitudes {V0.5, V1, ...Va2, ..., Vb2} at each rotation frequency and the vibration amplitude of K4*Vrms, where a2 is a multiple of 0.5 and b2 is an integer greater than 10.

[0018] Preferably, in the self-diagnosis method for centrifugal fan fault, when the equipment has no loose foundation, after the step of determining whether the centrifugal fan has shaft wear according to the vibration amplitudes {V0.5, V1, ... Va2, ..., Vb2} at each rotation frequency and the vibration amplitude of K4*Vrms, the self-diagnosis method further comprises:

[0019] When the equipment has no shaft wear, calculate the effective value of the vibration amplitude corresponding to the inner ring damage frequency;

[0020] Determine whether the effective value of the vibration amplitude corresponding to the inner ring damage frequency is greater than or equal to the vibration amplitude of K4*Vrms;

[0021] When the third judgment result is yes, it is determined that the inner ring of the bearing of the equipment is faulty;

[0022] When the third judgment result is no, it is determined that the equipment has no bearing inner ring failure.

[0023] Preferably, in the self-diagnosis method for centrifugal fan fault, after the step of determining that the equipment has no bearing inner ring fault when the third judgment result is no, the method further includes:

[0024] When the equipment does not have a bearing inner ring failure, calculate the effective value of the vibration amplitude corresponding to the outer ring damage frequency;

[0025] Determine whether the effective value of the vibration amplitude corresponding to the outer ring damage frequency is greater than or equal to the vibration amplitude of K4*Vrms;

[0026] When the fourth judgment result is yes, it is determined that the outer ring of the bearing of the equipment is faulty;

[0027] When the fourth judgment result is no, it is determined that the equipment has no bearing outer ring failure.

[0028] Preferably, in the centrifugal fan fault self-diagnosis method, when the fourth judgment result is no, after determining that the equipment has no bearing outer ring fault, it also includes:

[0029] When the equipment does not have a bearing outer ring failure, calculate the effective value of the vibration amplitude corresponding to the damage frequency of the bearing cage;

[0030] Determine whether the effective value of the vibration amplitude corresponding to the damage frequency is greater than or equal to the vibration amplitude of K4*Vrms;

[0031] When the fifth judgment result is yes, it is determined that the bearing retainer of the equipment is faulty;

[0032] When the fifth judgment result is no, it is determined that the equipment has no bearing retainer failure.

[0033] Preferably, in the self-diagnosis method for centrifugal fan fault, in the step of calculating the effective value of the vibration amplitude corresponding to the damage frequency of the bearing retainer when the equipment does not have a bearing outer ring fault,

[0034]

[0035] Among them, FTF is the effective value of the vibration amplitude corresponding to the damage frequency of the bearing cage;

[0036] Vftf1, Vftf2, Vftf3, ..., Vftf20 are the vibration amplitudes of the cage damage frequency Vftfka obtained in the speed spectrum;

[0037]

[0038] Vftfka is k times the damage frequency of the cage, where k is an integer from 1 to 20;

[0039] D0 is the median diameter of the bearing;

[0040] d is the roller diameter;

[0041] A is the contact angle of the roller;

[0042] f n is the speed frequency of the inner ring of the bearing relative to the outer ring.

[0043] Preferably, in the self-diagnosis method for centrifugal fan fault, in the step of calculating the effective value of the vibration amplitude corresponding to the outer ring damage frequency when the equipment does not have a bearing inner ring fault,

[0044]

[0045] Among them, BPFO is the effective value of the vibration amplitude corresponding to the outer ring damage frequency;

[0046] Vbpfo1, Vbpfo2, Vbpfo3, ..., Vbpfo20 are vibration amplitudes at the vibration amplitude of the outer ring damage frequency Vbpfoka obtained in the speed spectrum;

[0047]

[0048] Vbpfoka is k times the damage frequency of the cage, where k is an integer from 1 to 20;

[0049] D0 is the median diameter of the bearing;

[0050] d is the roller diameter;

[0051] A is the contact angle of the roller;

[0052] Z is the number of rollers;

[0053] f n is the speed frequency of the inner ring of the bearing relative to the outer ring.

[0054] Preferably, in the self-diagnosis method for centrifugal fan fault, in the step of calculating the effective value of the vibration amplitude corresponding to the inner ring damage frequency when the equipment has no shaft wear,

[0055]

[0056] Among them, BPFI is the effective value of the vibration amplitude corresponding to the inner ring damage frequency;

[0057] Vbpfi1, Vbpfi2, Vbpfi3…Vbpfi20 are the vibration amplitudes of the inner ring damage frequency Vbpfika obtained in the speed spectrum;

[0058]

[0059] Vbpfika is k times the damage frequency of the cage, where k is an integer from 1 to 20;

[0060] D0 is the median diameter of the bearing;

[0061] d is the roller diameter;

[0062] A is the contact angle of the roller;

[0063] Z is the number of rollers;

[0064] f n is the speed frequency of the inner ring of the bearing relative to the outer ring.

[0065] Preferably, in the self-diagnosis method for centrifugal fan fault, when the second judgment result is no, the step of determining whether the centrifugal fan is misaligned according to the vibration amplitude V1 at 1 times the rotation frequency, the vibration amplitude V2 at 2 times the rotation frequency, and the vibration amplitude of K4*Vrms comprises:

[0066] When the second judgment result is no, Whether the vibration amplitude is greater than or equal to K4*Vrms;

[0067] When the sixth judgment result is yes, it is determined that the device is misaligned;

[0068] When the sixth judgment result is no, it is determined that the device is not misaligned.

[0069] Preferably, in the self-diagnosis method for centrifugal fan fault, the step of determining whether the centrifugal fan has loose foundation according to the vibration amplitudes {V1, V2, ... Va1, ..., Vb1} at each rotation frequency and the vibration amplitude of K4*Vrms when the equipment is not misaligned comprises:

[0070] judge Whether the vibration amplitude is greater than or equal to K4*Vrms;

[0071] When the seventh judgment result is yes, it is determined that the foundation of the equipment is loose;

[0072] When the seventh judgment result is no, it is determined that the foundation of the equipment is not loose.

[0073] Preferably, in the self-diagnosis method for centrifugal fan fault, the step of determining whether the centrifugal fan has shaft wear according to the vibration amplitudes {V0.5, V1, ... Va2, ..., Vb2} at each rotation frequency and the vibration amplitude of K4*Vrms when the equipment has no foundation loosening comprises:

[0074] judge Whether the vibration amplitude is greater than or equal to K4*Vrms;

[0075] When the eighth judgment result is yes, it is determined that the equipment has shaft wear;

[0076] When the eighth judgment result is no, it is determined that the device has no shaft wear.

[0077] To achieve the above object, the present invention provides a computer device, the computer device comprising:

[0078] at least one processor; and,

[0079] a memory communicatively connected to the at least one processor; wherein,

[0080] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the above-mentioned self-diagnosis method of centrifugal fan fault.

[0081] To achieve the above object, the present invention provides a computer-readable storage medium storing a computer program, characterized in that when the computer program is executed by a processor, the above-mentioned self-diagnosis method of centrifugal fan fault is implemented.

[0082] The present invention has at least the following beneficial effects:

[0083] The self-diagnosis method for centrifugal fan fault provided by the present invention obtains the vibration acceleration signal of the centrifugal fan measuring point in real time; calculates the kurtosis value, crest factor and speed effective value of the acceleration waveform according to the vibration acceleration signal; in response to one of the kurtosis value, crest factor and speed effective value exceeding the corresponding threshold value, obtains the vibration amplitude Vmax of the maximum frequency and the resonance frequency of the equipment in the speed spectrum; judges whether the vibration amplitude Vmax of the maximum frequency is equal to the vibration amplitude at the resonance frequency of the equipment; when the first judgment result is yes, it is determined that a resonance fault occurs in the equipment; when the first judgment result is no, obtains the equipment rotation frequency RPM, and calculates the vibration amplitude V1 at 1 times the rotation frequency on the speed spectrum; judges whether the vibration amplitude V1 at 1 times the rotation frequency is greater than or equal to the vibration amplitude of K4*Vrms, wherein Vrms is the speed effective value and K4 is greater than or equal to 0.6; When the second judgment result is yes, it is determined that the equipment has an unbalanced fault; when the second judgment result is no, determine whether the centrifugal fan is misaligned based on the vibration amplitude V1 at 1 times the rotation frequency, the vibration amplitude V2 at 2 times the rotation frequency, and the vibration amplitude of K4*Vrms; when the equipment is not misaligned, determine whether the centrifugal fan has a loose foundation based on the vibration amplitudes {V1, V2, ...Va1, ..., Vb1} at each rotation frequency, and the vibration amplitude of K4*Vrms, where a1 is an integer and b1 is an integer greater than 10; when the equipment has not a loose foundation, determine whether the centrifugal fan has shaft wear based on the vibration amplitudes {V0.5, V1, ...Va2, ..., Vb2} at each rotation frequency, and the vibration amplitude of K4*Vrms, where a2 is a multiple of 0.5 and b2 is an integer greater than 10, so that the specific fault can be automatically analyzed and clarified. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] Figure 1A schematic diagram of a centrifugal fan fault self-diagnosis method provided by the present invention;

[0085] Figure 2 It is a speed spectrum diagram when unbalanced;

[0086] Figure 3 It is a speed spectrum diagram when it is misaligned;

[0087] Figure 4 It is a velocity spectrum diagram when foundation loosening occurs;

[0088] Figure 5 A schematic diagram of a computer device according to the present invention.

[0089] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0090] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0091] In the embodiments of the present invention, the term "and / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0092] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0093] In the embodiments of the present invention, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0094] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0095] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, it can be understood by those skilled in the art that in the embodiments of the present invention, many technical details are proposed in order to enable the reader to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present invention can also be implemented. The division of the following embodiments is for the convenience of description and should not constitute any limitation on the specific implementation of the present invention. The various embodiments can be combined and referenced with each other under the premise of no contradiction.

[0096] In order to solve the above problems, the present embodiment relates to a self-diagnosis method for centrifugal fan faults, which can be applied to computer equipment. The computer equipment can be a desktop computer, a tablet computer, a notebook computer, and other electronic devices with data processing capabilities. In other embodiments, it can also be other electronic devices with data processing capabilities, and no specific restrictions are made here.

[0097] The following is an explanation of the implementation details of the self-diagnosis method for centrifugal fan faults according to the first embodiment of the present invention. The following content is only provided for ease of understanding and is not necessary for the implementation of this solution. Figure 1 A schematic diagram of a centrifugal fan fault self-diagnosis method according to the present invention is shown.

[0098] In step S1001, the vibration acceleration signal of the centrifugal fan measuring point is obtained in real time. The measuring points of the centrifugal fan include the coupling end and the impeller end. The measuring point positions are divided into three directions: horizontal, vertical and axial. In specific diagnosis, the three directions need to be analyzed separately. The velocity spectrum can be obtained through the vibration acceleration signal.

[0099] Specifically, the method of obtaining the velocity spectrum through the vibration acceleration signal includes:

[0100] (1) The velocity signal is obtained by integrating the vibration acceleration signal. The calculation formula is:

[0101] v(t)=∫x(t)dt+C;

[0102] V(t) is the speed signal;

[0103] x(t) vibration acceleration signal;

[0104] C is the integration constant.

[0105] (2) The speed signal is transformed by fast Fourier transform to obtain the speed spectrum. The frequency components in the speed signal are obtained by Fourier transform.

[0106] From step S1002 to step S1003, the kurtosis value, crest factor, and velocity effective value of the acceleration waveform are calculated according to the vibration acceleration signal. The vibration effective value (including vibration severity) is obtained by extracting characteristic values ​​from the velocity spectrum. The kurtosis value and crest factor can also be obtained from the original waveform of the vibration acceleration signal.

[0107] The calculation formula of the kurtosis value of the acceleration waveform is:

[0108] Q = mean(x.^4);

[0109] The calculation formula for the crest factor of the acceleration waveform is:

[0110] CF=max(x) / sqrt(mean(x.^2));

[0111] The calculation formula of the effective value of the velocity waveform is:

[0112]

[0113] Q is the kurtosis value;

[0114] CF is the crest factor of the acceleration waveform;

[0115] Vrms is the effective value of speed;

[0116] mean() is the function for calculating the average value;

[0117] x is the abbreviation of vibration acceleration signal x(t);

[0118] v(t) is the velocity signal, which is the integrated signal of the vibration acceleration signal x(t);

[0119] T is the period.

[0120] In step S1005, it is determined whether the kurtosis value exceeds the corresponding threshold value K1. When the kurtosis value exceeds the corresponding threshold value K1, it is considered that the vibration amplitude of the equipment at the measuring point exceeds the standard, and the speed spectrum self-diagnosis needs to be started.

[0121] In step S1006, it is determined whether the crest factor exceeds the corresponding threshold value K2. When the crest factor exceeds the corresponding threshold value K2, it is considered that the vibration amplitude of the equipment at the measuring point exceeds the standard, and the speed spectrum self-diagnosis needs to be started.

[0122] In step S1007, it is determined whether the effective speed value exceeds the corresponding threshold value K3. When the effective speed value exceeds the corresponding threshold value K3, it is considered that the vibration amplitude of the equipment at the measuring point exceeds the standard, and the speed spectrum self-diagnosis needs to be started.

[0123] It should be noted that as long as any one of the indicators in step S1005 to step S1007 exceeds its preset threshold, it means that the vibration amplitude of the device at the measuring point exceeds the standard. That is, as long as one of the kurtosis value, crest factor, and speed effective value exceeds its corresponding threshold, the speed spectrum self-diagnosis can be started.

[0124] In step S1009, the vibration amplitude Vmax of the maximum frequency is obtained in the velocity spectrum. Alternatively, the frequency Fmax corresponding to the maximum amplitude is obtained in the velocity spectrum.

[0125] In step S1010, the resonant frequency Fn of the device is obtained. The resonant frequency of the centrifugal fan can be obtained by measuring with an instrument or by user input.

[0126] At step S1011, it is determined whether the vibration amplitude Vmax of the maximum frequency is equal to the vibration amplitude at the resonant frequency of the device. When the vibration amplitude Vmax of the maximum frequency is equal to the vibration amplitude at the resonant frequency of the device, it is considered that a resonance failure has occurred in the device; when the vibration amplitude Vmax of the maximum frequency is not equal to the vibration amplitude at the resonant frequency of the device, it is considered that no resonance failure has occurred in the device. In other embodiments, the frequency Fmax corresponding to the maximum amplitude can be compared with the resonant frequency Fn of the device. When the frequency Fmax corresponding to the maximum amplitude is equal to the resonant frequency Fn of the device, it is considered that a resonance failure has occurred in the device; when the frequency Fmax corresponding to the maximum amplitude is not equal to the resonant frequency Fn of the device, it is considered that no resonance failure has occurred in the device.

[0127] In step S1013, when the device does not have a resonance failure, the device rotation frequency RPM is obtained, and the vibration amplitude V1 at 1 times the rotation frequency is calculated on the speed spectrum. Specifically, when the vibration amplitude Vmax of the maximum frequency is not equal to the vibration amplitude at the device resonance frequency, the device rotation frequency RPM is obtained, and the vibration amplitude V1 at 1 times the rotation frequency is calculated on the speed spectrum; or when the frequency Fmax corresponding to the maximum amplitude is not equal to the device resonance frequency Fn, the device rotation frequency RPM is obtained, and the vibration amplitude V1 at 1 times the rotation frequency is calculated on the speed spectrum. Through the device rotation frequency RPM and the vibration amplitude V1 at 1 times the rotation frequency, it is further determined whether misalignment occurs.

[0128] At step S1014, it is determined whether the vibration amplitude V1 at 1 times the rotation frequency is greater than or equal to the vibration amplitude of K4*Vrms. When the equipment does not have a resonance fault, it is determined whether V1 is greater than or equal to the vibration amplitude of K4*Vrms; when V1 is greater than or equal to the vibration amplitude of K4*Vrms, it is considered that the equipment has an unbalanced fault; when V1 is less than the vibration amplitude of K4*Vrms, it is considered that the equipment has not had an unbalanced fault. Figure 2 The figure shows a velocity spectrum diagram when unbalanced. Figure 2 As shown, Figure 2 It can be seen that the relationship between the vibration amplitude of V1 and K4*Vrms when imbalance occurs. It should be noted that K4 can be obtained by training based on historical data. In this embodiment, K4 is 0.6.

[0129] Step S1017 determines whether the centrifugal fan is misaligned based on the vibration amplitude V1 at 1 times the rotation frequency, the vibration amplitude V2 at 2 times the rotation frequency, and the vibration amplitude of K4*Vrms when it is determined that the device is not unbalanced. Specifically, when the device is not unbalanced, it is determined whether the centrifugal fan is misaligned. Is the vibration amplitude greater than or equal to K4*Vrms? If the judgment result is yes, it is determined that the device is misaligned; if the judgment result is no, it is determined that the device is not misaligned. Where K4≥0.6. In this embodiment, K4 is 0.6. Figure 3 The figure shows a velocity spectrum diagram when there is misalignment. Figure 3 As shown, Figure 3 It can be seen that when misalignment occurs Relationship with the vibration amplitude of K4*Vrms.

[0130] At step S1019 and step S1020, when the equipment is not misaligned, determine whether the centrifugal fan has a loose foundation based on the vibration amplitudes {V1, V2, ...Va1, ..., Vb1} at each rotation frequency and the vibration amplitude of K4*Vrms, where a1 is an integer and b1 is an integer greater than 10.

[0131] Specifically, judge Is the vibration amplitude greater than or equal to K4*Vrms? If the judgment result is yes, it is determined that the foundation of the equipment is loose; if the judgment result is no, it is determined that the foundation of the equipment is not loose.

[0132] In this embodiment, b1 is 20. If the vibration amplitude is greater than or equal to K4*Vrms, it is determined that the foundation of the equipment is loose; If the vibration amplitude is less than K4*Vrms, it is determined that the foundation of the equipment is not loose. Figure 4 The figure shows a velocity spectrum when foundation loosening occurs. Figure 4 As shown, Figure 4 It can be seen that when the foundation loosens Relationship with the vibration amplitude of K4*Vrms.

[0133] At step S1022 and step S1023, when the foundation of the equipment is not loose, determine whether the centrifugal fan has shaft wear based on the vibration amplitudes {V0.5, V1, ...Va2, ..., Vb2} at each rotation frequency and the vibration amplitude of K4*Vrms, where a2 is a multiple of 0.5 and b2 is an integer greater than 10.

[0134] Specifically, judge Whether the vibration amplitude is greater than or equal to K4*Vrms; when the judgment result is yes, it is determined that the equipment has shaft wear; when the judgment result is no, it is determined that the equipment has no shaft wear.

[0135] In this embodiment, b2 is 20.

[0136] When the vibration amplitude is greater than or equal to K4*Vrms, it is determined that the centrifugal fan has a shaft wear fault.

[0137] When the vibration amplitude is less than K4*Vrms, it is determined that there is no shaft wear fault in the centrifugal fan.

[0138] It should be noted that V0.5 in the present invention refers to the vibration amplitude at 0.5 times the rotation frequency, V1 refers to the vibration amplitude at 1 times the rotation frequency, ..., and so on. Specifically, V0.5 is the vibration amplitude at every 0.5 times the rotation frequency RPM found in the speed spectrum.

[0139] At step S1025 and step S1026, when the equipment has no shaft wear, calculate the effective value BPFI of the vibration amplitude corresponding to the inner ring damage frequency; determine whether the effective value BPFI of the vibration amplitude corresponding to the inner ring damage frequency is greater than or equal to the vibration amplitude of K4*Vrms. When the judgment result is yes, it is determined that the equipment has a bearing inner ring fault; when the judgment result is no, it is determined that the equipment has no bearing inner ring fault.

[0140] Specifically,

[0141] Among them, BPFI is the effective value of the vibration amplitude corresponding to the inner ring damage frequency;

[0142] Vbpfi1, Vbpfi2, Vbpfi3…Vbpfi20 are the vibration amplitudes of the inner ring damage frequency Vbpfika obtained in the speed spectrum;

[0143]

[0144] Vbpfika is k times the damage frequency of the cage, where k is an integer from 1 to 20;

[0145] D0 is the median diameter of the bearing;

[0146] d is the roller diameter;

[0147] A is the contact angle of the roller;

[0148] Z is the number of rollers;

[0149] fn is the speed frequency of the inner ring of the bearing relative to the outer ring.

[0150] At step S1028 and step S1029, when the device does not have a bearing inner ring fault, calculate the effective value of the vibration amplitude corresponding to the outer ring damage frequency; determine whether the effective value of the vibration amplitude corresponding to the outer ring damage frequency is greater than or equal to the vibration amplitude of K4*Vrms. If the judgment result is yes, it is determined that the device has a bearing outer ring fault; if the judgment result is no, it is determined that the device does not have a bearing outer ring fault.

[0151] Specifically,

[0152] Among them, BPFO is the effective value of the vibration amplitude corresponding to the outer ring damage frequency;

[0153] Vbpfo1, Vbpfo2, Vbpfo3, ..., Vbpfo20 are vibration amplitudes at the vibration amplitude of the outer ring damage frequency Vbpfoka obtained in the speed spectrum;

[0154]

[0155] Vbpfoka is k times the damage frequency of the cage, where k is an integer from 1 to 20;

[0156] D0 is the median diameter of the bearing;

[0157] d is the roller diameter;

[0158] A is the contact angle of the roller;

[0159] Z is the number of rollers;

[0160] f n is the speed frequency of the inner ring of the bearing relative to the outer ring.

[0161] At step S1031 and step S1032, when the device does not have a bearing outer ring failure, calculate the effective value of the vibration amplitude corresponding to the damage frequency of the bearing retainer; and determine whether the effective value of the vibration amplitude corresponding to the damage frequency is greater than or equal to the vibration amplitude of K4*Vrms. If the judgment result is yes, it is determined that the device has a bearing retainer failure; if the judgment result is no, it is determined that the device does not have a bearing retainer failure.

[0162] Specifically,

[0163] Among them, FTF is the effective value of the vibration amplitude corresponding to the damage frequency of the bearing cage;

[0164] Vftf1, Vftf2, Vftf3, ..., Vftf20 are the vibration amplitudes of the cage damage frequency Vftfka obtained in the speed spectrum;

[0165]

[0166] Vftfka is k times the damage frequency of the cage, where k is an integer from 1 to 20;

[0167] D0 is the median diameter of the bearing;

[0168] d is the roller diameter;

[0169] A is the contact angle of the roller;

[0170] f n is the speed frequency of the inner ring of the bearing relative to the outer ring.

[0171] In order to further verify the beneficial effects of the centrifugal fan fault self-diagnosis method provided by the present invention, multiple groups of faulty equipment are tested below, as shown in Table 1.

[0172] Table 1 Test instance data

[0173]

[0174] Table 2 Model test results and actual test results

[0175]

[0176] Table 1 lists 8 examples of faults and related data, and Table 2 shows the results of the self-diagnosis method for centrifugal fan faults provided by the present invention (in three directions: V, H, and A), as well as the results of actual verification. It can be seen from Tables 1 and 2 that the accuracy of the self-diagnosis method for centrifugal fan faults provided by the present invention is very high.

[0177] In order to achieve the above object, the present invention also provides a computer device, such as Figure 5 As shown, the computer device includes at least one processor 201; and a memory 202 that is communicatively connected to the at least one processor 201; wherein the memory 202 stores instructions that can be executed by the at least one processor 201, and the instructions are executed by the at least one processor 201 so that the at least one processor 201 can execute the above-mentioned self-diagnosis method of centrifugal fan fault.

[0178] The memory 202 and the processor 201 are connected in a bus manner, and the bus may include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors 201 and the memory 202 together. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be one element or multiple elements, such as multiple receivers and transmitters, providing a unit for communicating with various other devices on a transmission medium. The data processed by the processor 201 is transmitted on a wireless medium through an antenna, and further, the antenna also receives data and transmits the data to the processor 201.

[0179] The processor 201 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management and other control functions. The memory 202 can be used to store data used by the processor 201 when performing operations.

[0180] In order to achieve the above object, the present invention provides a computer-readable storage medium storing a computer program, wherein the computer program implements the above self-diagnosis method of centrifugal fan fault when executed by a processor.

[0181] That is, those skilled in the art can understand that all or part of the steps in the above-mentioned implementation method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor to execute all or part of the steps of the method described in each implementation of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0182] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, ordinary technicians in this field can make other different forms of changes or modifications without creative work, which should fall within the scope of protection of the present invention.

Claims

1. A self-diagnosis method for centrifugal fan fault, characterized in that: include: Obtain the vibration acceleration signal of the centrifugal fan measuring point in real time; According to the vibration acceleration signal, the kurtosis value, the crest factor, and the velocity effective value of the acceleration waveform are calculated; In response to one of the kurtosis value, the crest factor, and the velocity effective value exceeding its corresponding threshold value, obtaining the vibration amplitude Vmax of the maximum frequency and the resonance frequency of the device in the velocity spectrum; Determine whether the vibration amplitude Vmax of the maximum frequency is equal to the vibration amplitude at the resonant frequency of the equipment; When the first judgment result is yes, it is determined that a resonance failure occurs in the device; When the first judgment result is no, the RPM of the equipment is obtained, and the vibration amplitude V1 at 1 times the rotation frequency is calculated on the speed spectrum; Determine whether the vibration amplitude V1 at 1 times the rotation frequency is greater than or equal to the vibration amplitude of K4*Vrms, where Vrms is the effective value of the speed and K4 is greater than or equal to 0.6; When the second judgment result is yes, it is determined that an unbalanced fault occurs in the device; When the second judgment result is no, determine whether the centrifugal fan is misaligned based on the vibration amplitude V1 at 1 times the rotation frequency, the vibration amplitude V2 at 2 times the rotation frequency, and the vibration amplitude K4*Vrms; When the equipment is not misaligned, determine whether the centrifugal fan has loose foundation according to the vibration amplitudes {V1, V2, ... Va1, ..., Vb1} at each rotation frequency and the vibration amplitude of K4*Vrms, where a1 is an integer and b1 is an integer greater than 10; When the foundation of the equipment is not loose, determine whether the centrifugal fan has shaft wear based on the vibration amplitudes {V0.5, V1, ...Va2, ..., Vb2} at each rotation frequency and the vibration amplitude of K4*Vrms, where a2 is a multiple of 0.5 and b2 is an integer greater than 10.

2. The centrifugal fan fault self-diagnosis method according to claim 1, characterized in that: When the foundation of the equipment is not loose, after the step of determining whether the centrifugal fan has shaft wear according to the vibration amplitudes {V0.5, V1, ... Va2, ..., Vb2} at each rotation frequency and the vibration amplitude of K4*Vrms, the self-diagnosis method further includes: When the equipment has no shaft wear, calculate the effective value of the vibration amplitude corresponding to the inner ring damage frequency; Determine whether the effective value of the vibration amplitude corresponding to the inner ring damage frequency is greater than or equal to the vibration amplitude of K4*Vrms; When the third judgment result is yes, it is determined that the inner ring of the bearing of the equipment is faulty; When the third judgment result is no, it is determined that the equipment has no bearing inner ring failure.

3. The centrifugal fan fault self-diagnosis method according to claim 2, characterized in that: After the step of determining that the device has no bearing inner ring failure when the third judgment result is no, the method further includes: When the equipment does not have a bearing inner ring failure, calculate the effective value of the vibration amplitude corresponding to the outer ring damage frequency; Determine whether the effective value of the vibration amplitude corresponding to the outer ring damage frequency is greater than or equal to the vibration amplitude of K4*Vrms; When the fourth judgment result is yes, it is determined that the outer ring of the bearing of the equipment is faulty; When the fourth judgment result is no, it is determined that the equipment has no bearing outer ring failure.

4. The centrifugal fan fault self-diagnosis method according to claim 3, characterized in that: When the fourth judgment result is no, after determining that the equipment has no bearing outer ring failure, the method further includes: When the equipment does not have a bearing outer ring failure, calculate the effective value of the vibration amplitude corresponding to the damage frequency of the bearing cage; Determine whether the effective value of the vibration amplitude corresponding to the damage frequency is greater than or equal to the vibration amplitude of K4*Vrms; When the fifth judgment result is yes, it is determined that the bearing retainer of the equipment is faulty; When the fifth judgment result is no, it is determined that the equipment has no bearing retainer failure.

5. The centrifugal fan fault self-diagnosis method according to claim 4, characterized in that: In the step of calculating the effective value of the vibration amplitude corresponding to the damage frequency of the bearing retainer when the equipment does not have a bearing outer ring failure, Among them, FTF is the effective value of the vibration amplitude corresponding to the damage frequency of the bearing cage; Vftf1, Vftf2, Vftf3, ..., Vftf20 are the vibration amplitudes of the cage damage frequency Vftfka obtained in the speed spectrum; Vftfka is k times the damage frequency of the cage, where k is an integer from 1 to 20; D0 is the median diameter of the bearing; d is the roller diameter; A is the contact angle of the roller; f n is the speed frequency of the inner ring of the bearing relative to the outer ring.

6. The centrifugal fan fault self-diagnosis method according to claim 2, characterized in that: In the step of calculating the effective value of the vibration amplitude corresponding to the outer ring damage frequency when the equipment does not have a bearing inner ring failure, Among them, BPFO is the effective value of the vibration amplitude corresponding to the outer ring damage frequency; Vbpfo1, Vbpfo2, Vbpfo3…Vbpfo20 are the vibration amplitudes of the outer ring damage frequency Vbpfoka obtained in the speed spectrum; Vbpfoka is k times the damage frequency of the cage, where k is an integer from 1 to 20; D0 is the median diameter of the bearing; d is the roller diameter; A is the contact angle of the roller; Z is the number of rollers; f n is the speed frequency of the inner ring of the bearing relative to the outer ring.

7. The centrifugal fan fault self-diagnosis method according to claim 2, characterized in that: In the step of calculating the effective value of the vibration amplitude corresponding to the inner ring damage frequency when the equipment has no shaft wear, Among them, BPFI is the effective value of the vibration amplitude corresponding to the inner ring damage frequency; Vbpfi 1, Vbpfi2, Vbpfi 3, ..., Vbpfi20 are the vibration amplitudes of the inner race damage frequency Vbpfika obtained in the speed spectrum; Vbpfika is k times the damage frequency of the cage, where k is an integer from 1 to 20; D0 is the median diameter of the bearing; d is the roller diameter; A is the contact angle of the roller; Z is the number of rollers; f n is the speed frequency of the inner ring of the bearing relative to the outer ring.

8. The centrifugal fan fault self-diagnosis method according to claim 1, characterized in that: When the second judgment result is no, the step of determining whether the centrifugal fan is misaligned according to the vibration amplitude V1 at 1 times the rotation frequency, the vibration amplitude V2 at 2 times the rotation frequency, and the vibration amplitude of K4*Vrms comprises: When the second judgment result is no, Whether the vibration amplitude is greater than or equal to K4*Vrms; When the sixth judgment result is yes, it is determined that the device is misaligned; When the sixth judgment result is no, it is determined that the device is not misaligned.

9. The centrifugal fan fault self-diagnosis method according to claim 1, characterized in that: The step of determining whether the centrifugal fan has loose foundation according to the vibration amplitudes {V1, V2, ... Va1, ..., Vb1} at each rotation frequency and the vibration amplitude of K4*Vrms when the equipment is not misaligned comprises: judge Whether the vibration amplitude is greater than or equal to K4*Vrms; When the seventh judgment result is yes, it is determined that the foundation of the equipment is loose; When the seventh judgment result is no, it is determined that the foundation of the equipment is not loose.

10. The centrifugal fan fault self-diagnosis method according to claim 1, characterized in that: The step of determining whether the centrifugal fan has shaft wear according to the vibration amplitudes {V0.5, V1, ... Va2, ..., Vb2} at each rotation frequency and the vibration amplitude of K4*Vrms when the foundation of the equipment is not loose includes: judge Whether the vibration amplitude is greater than or equal to K4*Vrms; When the eighth judgment result is yes, it is determined that the equipment has shaft wear; When the eighth judgment result is no, it is determined that the device has no shaft wear.

11. A computer device, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the self-diagnosis method for centrifugal fan faults as described in any one of claims 1 to 10.

12. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the self-diagnosis method for centrifugal fan fault according to any one of claims 1 to 10 is implemented.

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