CN117231490A - Dynamic balance test method for condensate pump - Google Patents
Dynamic balance test method for condensate pump Download PDFInfo
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- 238000010998 test method Methods 0.000 title claims abstract description 7
- 238000012937 correction Methods 0.000 claims abstract description 151
- 239000004568 cement Substances 0.000 claims abstract description 43
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000011159 matrix material Substances 0.000 claims description 14
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
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- 239000004570 mortar (masonry) Substances 0.000 description 2
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Abstract
The application discloses a dynamic balance test method of a condensate pump, which relates to the field of dynamic balance and comprises the steps of calculating the total allowable unbalance of a rotor of a condensate pump motor and the allowable unbalance of a left correction surface and a right correction surface; if the residual unbalance amounts of the two correction surfaces are higher than the corresponding allowable unbalance amounts, carrying out balance correction; respectively determining the quality of balance cement required by the left correction surface and the right correction surface and correspondingly pasting the balance cement; testing the balance-weight-free vibration of the condensate pump motor, and judging whether the balance-weight-free vibration data meet a preset vibration amplitude range or not; if the vibration data do not meet the first balance calibration data, carrying out weight balancing on the rotor of the condensate pump motor, testing and recording the vibration data after weight balancing, and taking the vibration data as first balance calibration data; if the first balance calibration data does not meet the preset vibration amplitude range, correcting the weight value according to the vibration change before and after the weight, recording the vibration data after the weight is corrected, and starting the machine to detect the vibration data as second balance correction data. The method can effectively improve the balance accuracy.
Description
Technical Field
The application relates to the technical field of dynamic balance, in particular to a method for testing dynamic balance of a condensate pump.
Background
The condensate pump motor is one of the common equipment in the chemical industry field, is often used for carrying the water pump of high temperature condensate and goes up technology, but because long-term operation can lead to motor rotor and outside rotating member unbalance inside the motor to cause a large amount of counter weight vibrations and noise, seriously influence the balanced operating efficiency and the life-span of equipment. Therefore, the dynamic balance of the condensate pump motor is necessary.
Dynamic balance refers to a test for uniformly distributing the mass of a rotating member in a rotating machine system to eliminate unbalanced force and reduce vibration and noise, and dynamic balance detection is a test for detecting whether the mass of the rotating member in the machine system is uniformly distributed and whether an unbalance phenomenon exists, and correcting unbalance of a rotor by using a balance principle. In the existing dynamic balance detection method, the mass distribution of a rotor is balanced usually in a counterweight mode, but the trial-addition mass cannot be determined rapidly based on the actual condition of equipment, in the actual operation, the counterweight steps are complicated, uncertain factors are too many, the counterweight result is inaccurate, the balance precision is low, in the balance process, the difference between the working rotating speed of the rotor and the balance rotating speed is large, the balance rotating speed is not matched with the working rotating speed, and the balance precision is greatly reduced.
Therefore, how to accurately and efficiently balance the rotor of the condensate pump motor, and reduce the difference between the working rotation speed and the balance rotation speed of the rotor to improve the balance accuracy are technical problems to be solved at present.
Disclosure of Invention
The application provides a dynamic balance test method of a condensate pump, which is used for solving the problems of low balance efficiency of a rotor of a water pump motor, large difference between the working rotation speed and the balance rotation speed of the rotor and low balance precision in the prior art, and comprises the following steps:
calculating total allowable unbalance of a rotor of the condensate pump motor, distributing the total allowable unbalance to left and right correction surfaces of the rotor, and calculating allowable unbalance of the left and right correction surfaces respectively;
detecting residual unbalance amounts of the left correction surface and the right correction surface through a balancing machine, and carrying out balance correction on the condensate pump motor if the residual unbalance amounts of the left correction surface and the right correction surface are higher than the corresponding allowable unbalance amounts, wherein the balance correction comprises: pasting balance cement and a counterweight;
determining the quality of balance cement required by the left correction surface and the right correction surface according to the residual unbalance amount of the left correction surface and the right correction surface and the corresponding allowable unbalance amount respectively, and correspondingly pasting the balance cement;
testing the balance-weight-free vibration of the condensate pump motor, and judging whether the balance-weight-free vibration data meet a preset vibration amplitude range or not;
if the vibration data without the counterweight does not meet the preset vibration amplitude range, carrying out counterweight on the rotor of the condensate pump motor, testing and recording the vibration data after counterweight, wherein the vibration data after counterweight is first balance calibration data;
if the first balance calibration data does not meet the preset vibration amplitude range, correcting the weight value according to the vibration change before and after the weight and recording vibration data after the weight is corrected, wherein the vibration data after the weight is corrected is second balance correction data;
and controlling the motor to operate based on the second balance correction data and monitoring a dynamic balance correction result in real time.
In some embodiments of the present application, the calculating the total allowable unbalance amount of the condensate pump motor rotor includes:
calculating the unbalance of the rotor, and calculating the total unbalance of the rotor according to the unbalance;
wherein e per Representing unbalance of rotor, S u Representing nothingBalance intensity, w 0 Represents the highest angular velocity of the rotor, n 0 Representing the highest rotation speed of the rotor;
U per ＝e per m
wherein U is per Representing the total unbalance of the rotor, m representing the mass of the rotor.
In some embodiments of the present application, the distributing the total allowable unbalance amount to the left and right correction surfaces of the rotor and calculating allowable unbalance amounts of the left and right correction surfaces, respectively, includes:
let the ratio of the allowable unbalance amounts of the left and right correction surfaces of the rotor be D
Wherein U is per1 Indicating the allowable unbalance amount of the left correction surface, U per2 Indicating the allowable unbalance amount of the right correction surface.
In some embodiments of the present application, the determining the mass of the balance cement required for the left and right correction surfaces according to the difference between the remaining unbalance amounts of the left and right correction surfaces and the corresponding allowable unbalance amounts includes:
setting the residual unbalance of the left correction surface as P, and presetting a residual unbalance array (P1, P2, P3 and P4) of the left correction surface, wherein P1, P2, P3 and P4 are all preset values, and P1 is more than P2 and less than P3 and less than P4;
setting the difference between the residual unbalance amount and the allowable unbalance amount of the left correction surface as L, presetting an array (L1, L2, L3, L4) of the difference between the residual unbalance amount and the allowable unbalance amount of the left correction surface, wherein L1, L2, L3, L4 are all preset values, and L1=P1-U per1 ，L2＝P2-U per1 ，L3＝P3-U per1 ，L4＝P4-U per1 L1 is more than L2 and less than L3 and less than L4;
setting the mass of the balance adhesive cement required by the left correction surface as M, and presetting mass arrays (M1, M2, M3 and M4) of the balance adhesive cement required by the left correction surface, wherein M1, M2, M3 and M4 are all preset values, and M1 is more than M2 and less than M3 and less than M4;
selecting the quality of balance cement required by the left correction surface according to the difference value interval of the left correction surface residual unbalance and the allowable unbalance;
if L is less than L1, selecting M1 as the mass of the balance cement required by the left correction surface;
if L1 is less than L2, selecting M2 as the mass of the balance cement required by the left correction surface;
if L2 is less than L3, selecting M3 as the mass of the balance cement required by the left correction surface;
if L3 is less than L4, selecting M4 as the mass of the balance cement required by the left correction surface.
In some embodiments of the present application, the testing the non-counterweight vibration of the condensate pump motor and determining whether the non-counterweight vibration data satisfies a preset vibration amplitude range includes:
the method comprises the steps that a speed sensor is respectively arranged at the free end and the driving end of a condensate pump motor rotor, vibration measuring points are arranged at the free end and the driving end of the condensate pump motor rotor, vibration amplitude values and phase values at the vibration measuring points when the condensate pump motor is not provided with a counterweight at different moments are detected through a vibration analyzer, and the average value of the vibration amplitude values of the free end and the average value of the vibration amplitude values of the driving end at different moments and the average value of all phase values of the free end and the driving end at different moments are calculated;
the average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end and the average value of all phase values of the free end and the driving end at different moments without the counterweight are the original data A0;
if the average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end are higher than the corresponding preset vibration amplitude threshold, and the difference between the average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end is greater than the difference between the preset vibration amplitude threshold of the free end and the preset vibration amplitude threshold of the driving end, the original data A0 does not meet the preset vibration amplitude range when no counterweight exists.
In some embodiments of the application, the method further comprises: adjusting the operating speed of the motor and determining a balance speed matching the operating speed, comprising:
setting the working rotation speed of a motor rotor as C, presetting a working rotation speed C matrix array (C1, C2, C3 and C4), wherein C1, C2, C3 and C4 are all preset values, and C1 is more than C2 and less than C3 and less than C4;
let the balance rotation speed of the motor be V2,
wherein G is the precision grade, r is the correction radius, and x is the unbalanced qualification;
if the difference value between the balance rotating speed V2 of the motor and the working rotating speed C is larger than a preset difference value threshold, adjusting the working rotating speed C according to the difference value, and determining the balance rotating speed of the motor again according to the adjusted working rotating speed;
the adjusting the working rotation speed C according to the difference value comprises the following steps:
the difference value between the balance rotating speed V2 and the working rotating speed C is V2-C, the difference threshold value between the balance rotating speed and the working rotating speed is B, and a difference matrix array (B1, B2, B3 and B4) is preset, wherein B1, B2, B3 and B4 are all preset values, and B1 is more than B2 and less than B3 and less than B4;
setting the adjustment quantity of the working rotation speed as E, and presetting a matrix array (E1, E2, E3 and E4) of the adjustment quantity of the working rotation speed, wherein E1, E2, E3 and E4 are all preset values, and E1 is more than E2 and less than E3 and less than E4;
according to the relation between the difference V2-C and a preset difference threshold matrix B, selecting a corresponding working rotation speed adjustment quantity to adjust the ith preset working rotation speed;
if V2-C is larger than B4, selecting a preset adjustment quantity E1 to correct the ith preset working rotation speed, wherein the corrected working rotation speed adjustment quantity is E1;
if B3 is less than V2-C is less than B4, selecting a preset adjustment quantity E2 to correct the ith preset working rotation speed, wherein the corrected working rotation speed adjustment quantity is E2 x Ci;
if B2 is less than V2-C is less than B3, selecting a preset adjustment quantity E3 to correct the ith preset working rotation speed, wherein the corrected working rotation speed adjustment quantity is E3 x Ci;
if B1 is smaller than V2-C is smaller than B2, selecting a preset adjustment quantity E4 to correct the ith preset working rotating speed, wherein the corrected working rotating speed adjustment quantity is E4. Ci.
In some embodiments of the present application, the balancing the rotor of the condensate pump motor, testing and recording vibration data after balancing, wherein the vibration data after balancing is first balance calibration data, including:
the counterweight includes a trial mass and a trial angle, the trial mass including:
determining the centrifugal force of the rotor after the test-adding mass according to the rotational inertia of the rotor of the motor, and calculating the test-adding mass of the rotor according to the centrifugal force;
setting the moment of inertia of a rotor as J, and presetting moment of inertia arrays (J1, J2, J3 and J4), wherein J1, J2, J3 and J4 are all preset values, and J1 is more than J2 and J3 is more than J4;
setting the centrifugal force after the rotor is subjected to trial mass as F, and presetting a centrifugal force array (F1, F2, F3 and F4) after the rotor is subjected to trial mass, wherein F1, F2, F3 and F4 are all preset values, and F1 is more than F2 and less than F3 and less than F4;
selecting centrifugal force after the test mass is added according to the interval of the rotor moment of inertia;
if J is less than J1, F1 is selected as the centrifugal force after the mass is added;
if J1 is less than J2, F2 is selected as centrifugal force after the mass is tested;
if J2 is less than J3, F3 is selected as centrifugal force after the mass is tested;
if J3 is less than J4, F4 is selected as centrifugal force after the mass is tested;
let the trial mass of the rotor be M 0 Then
Wherein a is the centripetal acceleration of the rotor;
trial mass M 0 Then, the vibration amplitude and the phase of the vibration measuring points at the free end and the driving end at different moments are detected againThe value, and calculate the mean value of the vibration amplitude of the free end and the mean value of the vibration amplitude of the driving end at different moments, and the mean value of all phase values of the free end and the driving end at different moments; trial mass M 0 The average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end at different moments and the average value of all phase values of the free end and the driving end are first balance correction data;
the trial addition angle includes:
determining the range of a mechanical hysteresis angle according to the relation between the critical rotating speed and the balance rotating speed of the motor rotor, and calculating the trial addition angle of the rotor according to the mechanical hysteresis angle;
setting the critical speed of a motor rotor as V1, the mechanical hysteresis angle as beta, the trial addition angle as alpha, and the average value of all phase values of the free end and the driving end at different moments without counterweight as theta;
selecting a corresponding mechanical hysteresis angle range according to the relation between the critical rotation speed V1 and the balance rotation speed V2;
when V1 is more than or equal to V2, beta is more than 0 and less than or equal to 90 degrees;
when V1 is less than V2, 90 degrees is less than beta which is less than 180 degrees;
the trial addition angle alpha of the rotor is calculated from the mechanical hysteresis angle beta,
α＝θ-β+180°。
in some embodiments of the present application, the correcting the weight value according to the vibration variation before and after the weight includes:
calculating a dynamic balance influence coefficient through vibration data before and after the counterweight, and calculating the mass to be added according to the dynamic balance influence coefficient and the original vibration data A0;
the mass to be added is set as M ′ The dynamic balance influence coefficient is&The first dynamic balance correction data is A1,
again testing the angle on the basis of alpha, wherein the total angle after testing is alpha ′ Based on M ′ And alpha ′ And (5) re-weighting.
By applying the technical scheme, the total allowable unbalance of the rotor of the condensate pump motor and the allowable unbalance of the left correction surface and the right correction surface are calculated; if the residual unbalance amounts of the two correction surfaces are higher than the corresponding allowable unbalance amounts, carrying out balance correction; respectively determining the quality of balance cement required by the left correction surface and the right correction surface and correspondingly pasting the balance cement; testing the balance-weight-free vibration of the condensate pump motor, and judging whether the balance-weight-free vibration data meet a preset vibration amplitude range or not; if the vibration data do not meet the first balance calibration data, carrying out weight balancing on the rotor of the condensate pump motor, testing and recording the vibration data after weight balancing, and taking the vibration data as first balance calibration data; if the first balance calibration data does not meet the preset vibration amplitude range, correcting the weight value according to the vibration change before and after the weight, recording the vibration data after the weight is corrected, and starting the machine to detect the vibration data as second balance correction data. According to the method, dynamic balance of the condensate pump is detected, the balance weight is efficiently and accurately carried out according to the detection result and the condition of equipment, and the difference value between the working rotation speed and the balance rotation speed of the motor is detected and adjusted before the balance weight, so that the balance rotation speed is matched with the working rotation speed in the balance process, the balance precision is improved, the vibration and the noise of the equipment are reduced, and the service life of the equipment is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a flow chart of a dynamic balance test method for a condensate pump according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application,
it will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment of the application provides a dynamic balance test method of a condensate pump, as shown in fig. 1, comprising the following steps:
step S101, calculating total allowable unbalance of a rotor of the condensate pump motor, distributing the total allowable unbalance to left and right correction surfaces of the rotor, and calculating allowable unbalance of the left and right correction surfaces respectively.
In some embodiments of the present application, the calculating the total allowable unbalance amount of the condensate pump motor rotor includes:
calculating the unbalance of the rotor, and calculating the total unbalance of the rotor according to the unbalance;
wherein e per Representing unbalance of rotor, S u Representing unbalanced intensity, w 0 Represents the highest angular velocity of the rotor, n 0 Representing the highest rotation speed of the rotor;
U per ＝e per m
wherein U is per Representing the total unbalance of the rotor, m representing the mass of the rotor.
In this embodiment, the unbalance is the unbalance of the unit mass of the rotor of the dynamic balancing machine, the allowable unbalance is the residual unbalance of the rotor allowed for ensuring the normal operation of the rotary machine, and if the residual unbalance of the rotor after the balance correction is higher than the allowable residual unbalance, the balance correction needs to be continued.
In some embodiments of the present application, the distributing the total allowable unbalance amount to the left and right correction surfaces of the rotor and calculating allowable unbalance amounts of the left and right correction surfaces, respectively, includes:
let the ratio of the allowable unbalance amounts of the left and right correction surfaces of the rotor be D
Wherein U is per1 Indicating the allowable unbalance amount of the left correction surface, U per2 Indicating the allowable unbalance amount of the right correction surface.
In this embodiment, the rotor is divided into two symmetrical correction surfaces, and the total allowable unbalance amount of the rotor is distributed to the two correction surfaces, and the allowable unbalance amounts of the two correction surfaces serve as reference standards for whether the left and right sides of the rotor meet the unbalance range, in practical situations, it is difficult to achieve absolute balance of the motor rotor during operation, that is, it is impossible to completely eliminate the existing unbalance force, so long as the unbalance amounts on the two sides of the rotor are within the allowable unbalance amount range, normal operation of the device can be ensured, and severe vibration and noise caused by the unbalance force are avoided as much as possible.
In this embodiment, the unbalance of the left and right correction surfaces also ensures that the dynamic load of the left and right support surfaces of the rotor is not overloaded.
Step S102, detecting residual unbalance amounts of the left and right correction surfaces by a balancing machine, and if the residual unbalance amounts of the left and right correction surfaces are higher than the corresponding allowable unbalance amounts, performing balance correction on the condensate pump motor, where the balance correction includes: and pasting balance cement and a counterweight.
In this embodiment, the balancing machine may directly detect the residual unbalance amounts of the two correction surfaces, and after each detection, the dynamic balancing machine automatically separates and displays the residual unbalance amounts of the two correction surfaces. If the residual unbalance of the two correction surfaces exceeds the set allowable unbalance, the dynamic balancing machine alarms.
And step S103, determining the quality of the balance cement required by the left correction surface and the right correction surface according to the residual unbalance amount of the left correction surface and the right correction surface and the corresponding allowable unbalance amount respectively, and correspondingly pasting the balance cement.
In some embodiments of the present application, the determining the mass of the balance cement required for the left and right correction surfaces according to the difference between the remaining unbalance amounts of the left and right correction surfaces and the corresponding allowable unbalance amounts includes:
setting the residual unbalance of the left correction surface as P, and presetting a residual unbalance array (P1, P2, P3 and P4) of the left correction surface, wherein P1, P2, P3 and P4 are all preset values, and P1 is more than P2 and less than P3 and less than P4;
setting the difference between the residual unbalance amount and the allowable unbalance amount of the left correction surface as L, presetting an array (L1, L2, L3, L4) of the difference between the residual unbalance amount and the allowable unbalance amount of the left correction surface, wherein L1, L2, L3, L4 are all preset values, and L1=P1-U per1 ，L2＝P2-U per1 ，L3＝P3-U per1 ，L4＝P4-U per1 L1 is more than L2 and less than L3 and less than L4;
setting the mass of the balance adhesive cement required by the left correction surface as M, and presetting mass arrays (M1, M2, M3 and M4) of the balance adhesive cement required by the left correction surface, wherein M1, M2, M3 and M4 are all preset values, and M1 is more than M2 and less than M3 and less than M4;
selecting the quality of balance cement required by the left correction surface according to the difference value interval of the left correction surface residual unbalance and the allowable unbalance;
if L is less than L1, selecting M1 as the mass of the balance cement required by the left correction surface;
if L1 is less than L2, selecting M2 as the mass of the balance cement required by the left correction surface;
if L2 is less than L3, selecting M3 as the mass of the balance cement required by the left correction surface;
if L3 is less than L4, selecting M4 as the mass of the balance cement required by the left correction surface.
In this embodiment, the greater the difference between the remaining unbalance amount of the correction surface and the allowable unbalance amount, the greater the unbalance force of the correction surface, the greater the required mass of the balanced cement, and the matrix may be preset according to the relationship between the difference and the balanced cement to determine the mass of the cement corresponding to the different difference intervals.
It should be noted that, the determination methods of the balance mortars on the left and right correction surfaces are the same, and the method of the balance mortars required on the right correction surface refers to the left correction surface, and the description thereof will not be repeated here.
Step S104, testing the balance weight-free vibration of the condensate pump motor, and judging whether the balance weight-free vibration data meets a preset vibration amplitude range.
In some embodiments of the present application, the testing the non-counterweight vibration of the condensate pump motor and determining whether the non-counterweight vibration data satisfies a preset vibration amplitude range includes:
the method comprises the steps that a speed sensor is respectively arranged at the free end and the driving end of a condensate pump motor rotor, vibration measuring points are arranged at the free end and the driving end of the condensate pump motor rotor, vibration amplitude values and phase values at the vibration measuring points when the condensate pump motor is not provided with a counterweight at different moments are detected through a vibration analyzer, and the average value of the vibration amplitude values of the free end and the average value of the vibration amplitude values of the driving end at different moments and the average value of all phase values of the free end and the driving end at different moments are calculated;
the average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end and the average value of all phase values of the free end and the driving end at different moments without the counterweight are the original data A0;
if the average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end are higher than the corresponding preset vibration amplitude threshold, and the difference between the average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end is greater than the difference between the preset vibration amplitude threshold of the free end and the preset vibration amplitude threshold of the driving end, the original data A0 does not meet the preset vibration amplitude range when no counterweight exists.
In this embodiment, after the balance cement is adhered to the left and right correction surfaces of the rotor, it is necessary to further specifically determine whether the rotor still has an unbalanced force, and to detect specific vibration amplitude values and phase values of the free end and the driving end of the rotor, so that the vibration magnitudes and vibration difference values of the two ends of the rotor can be accurately reflected, so as to further accurately perform balance correction.
In this embodiment, the vibration amplitude of the free end of the rotor is generally greater than that of the driving end, the vibration amplitudes of the two ends at a plurality of moments are detected and an average value is obtained, and the average value of the vibration amplitudes of the ends is compared with a corresponding preset threshold value, so that the detection result is reflected more objectively and accurately.
And step 105, if the vibration data without the counterweight does not meet the preset vibration amplitude range, carrying out counterweight on the motor rotor of the condensate pump, testing and recording the vibration data after counterweight, wherein the vibration data after counterweight is first balance calibration data.
In some embodiments of the application, adjusting the operating speed of the motor and determining a balance speed that matches the operating speed includes:
setting the working rotation speed of a motor rotor as C, presetting a working rotation speed C matrix array (C1, C2, C3 and C4), wherein C1, C2, C3 and C4 are all preset values, and C1 is more than C2 and less than C3 and less than C4;
let the balance rotation speed of the motor be V2,
wherein G is the precision grade, r is the correction radius, and x is the unbalanced qualification;
if the difference value between the balance rotating speed V2 of the motor and the working rotating speed C is larger than a preset difference value threshold, adjusting the working rotating speed C according to the difference value, and determining the balance rotating speed of the motor again according to the adjusted working rotating speed;
the adjusting the working rotation speed C according to the difference value comprises the following steps:
the difference value between the balance rotating speed V2 and the working rotating speed C is V2-C, the difference threshold value between the balance rotating speed and the working rotating speed is B, and a difference matrix array (B1, B2, B3 and B4) is preset, wherein B1, B2, B3 and B4 are all preset values, and B1 is more than B2 and less than B3 and less than B4;
setting the adjustment quantity of the working rotation speed as E, and presetting a matrix array (E1, E2, E3 and E4) of the adjustment quantity of the working rotation speed, wherein E1, E2, E3 and E4 are all preset values, and E1 is more than E2 and less than E3 and less than E4;
according to the relation between the difference V2-C and a preset difference threshold matrix B, selecting a corresponding working rotation speed adjustment quantity to adjust the ith preset working rotation speed;
if V2-C is larger than B4, selecting a preset adjustment quantity E1 to correct the ith preset working rotation speed, wherein the corrected working rotation speed adjustment quantity is E1;
if B3 is less than V2-C is less than B4, selecting a preset adjustment quantity E2 to correct the ith preset working rotation speed, wherein the corrected working rotation speed adjustment quantity is E2 x Ci;
if B2 is less than V2-C is less than B3, selecting a preset adjustment quantity E3 to correct the ith preset working rotation speed, wherein the corrected working rotation speed adjustment quantity is E3 x Ci;
if B1 is smaller than V2-C is smaller than B2, selecting a preset adjustment quantity E4 to correct the ith preset working rotating speed, wherein the corrected working rotating speed adjustment quantity is E4. Ci.
In this embodiment, before the rotor of the motor is weighted, the working speed of the rotor needs to be determined according to the actual situation of the device, and the balancing speed is calculated according to the working speed, where the balancing speed is the highest speed reached by the device during dynamic balancing, and the excessive high or low balancing speed can affect the normal operation of the device or cause damage to the device, in the actual situation, the balancing speed is only slightly higher than the working speed, so that the difference between the balancing speed and the working speed of the rotor needs to be detected and controlled to be within a certain range, the working speed can be adjusted by the difference, and the balancing speed is recalculated according to the adjusted working speed, so as to ensure that the balancing speed and the working speed are matched, further ensure the normal operation of the device, avoid influencing the balance correction result, and improve the balancing precision.
In this embodiment, the accuracy level, the correction radius, and the unbalance qualification amount may be directly obtained.
In some embodiments of the present application, the balancing the rotor of the condensate pump motor, testing and recording vibration data after balancing, wherein the vibration data after balancing is first balance calibration data, including:
the counterweight includes a trial mass and a trial angle, the trial mass including:
determining the centrifugal force of the rotor after the test-adding mass according to the rotational inertia of the rotor of the motor, and calculating the test-adding mass of the rotor according to the centrifugal force;
setting the moment of inertia of a rotor as J, and presetting moment of inertia arrays (J1, J2, J3 and J4), wherein J1, J2, J3 and J4 are all preset values, and J1 is more than J2 and J3 is more than J4;
setting the centrifugal force after the rotor is subjected to trial mass as F, and presetting a centrifugal force array (F1, F2, F3 and F4) after the rotor is subjected to trial mass, wherein F1, F2, F3 and F4 are all preset values, and F1 is more than F2 and less than F3 and less than F4;
selecting centrifugal force after the test mass is added according to the interval of the rotor moment of inertia;
if J is less than J1, F1 is selected as the centrifugal force after the mass is added;
if J1 is less than J2, F2 is selected as centrifugal force after the mass is tested;
if J2 is less than J3, F3 is selected as centrifugal force after the mass is tested;
if J3 is less than J4, F4 is selected as centrifugal force after the mass is tested;
let the trial mass of the rotor be M 0 Then
Wherein a is the centripetal acceleration of the rotor;
trial mass M 0 Detecting vibration amplitude values and phase values of the free end and the driving end at different moments at the vibration measuring points again, and calculating an average value of the vibration amplitude values of the free end and the driving end at different moments and an average value of all phase values of the free end and the driving end at different moments; trial mass M 0 The average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end at different later momentsThe average value of all the phase values of the free end and the driving end is first balance correction data;
the trial addition angle includes:
determining the range of a mechanical hysteresis angle according to the relation between the critical rotating speed and the balance rotating speed of the motor rotor, and calculating the trial addition angle of the rotor according to the mechanical hysteresis angle;
setting the critical speed of a motor rotor as V1, the mechanical hysteresis angle as beta, the trial addition angle as alpha, and the average value of all phase values of the free end and the driving end at different moments without counterweight as theta;
selecting a corresponding mechanical hysteresis angle range according to the relation between the critical rotation speed V1 and the balance rotation speed V2;
when V1 is more than or equal to V2, beta is more than 0 and less than or equal to 90 degrees;
when V1 is less than V2, 90 degrees is less than beta which is less than 180 degrees;
the trial addition angle alpha of the rotor is calculated from the mechanical hysteresis angle beta,
α＝θ-β+180°。
in this embodiment, the rotor counterweight needs to be subjected to test-adding of the mass and the angle according to the actual condition of the device, and because of the centrifugal force of the horizontal vibration generated by the unbalanced mass during dynamic balance, when the mass is subjected to test-adding, the mass subjected to test-adding is increased by a certain centrifugal force, and the centrifugal force is in proportion to the moment of inertia of the rotor, the larger the moment of inertia of the rotor is, the larger the generated centrifugal force is, the preset moment of inertia and the centrifugal force matrix array can be used for determining the centrifugal force in the corresponding moment of inertia interval according to different moment of inertia, and the centrifugal acceleration is unchanged, so that the mass subjected to test-adding can be determined by determining the centrifugal force, and the mode can be used for determining the test-adding mass which approximately accords with the condition of the device more quickly and efficiently, so that a large-scale fumbling is avoided, and the test-adding times are reduced.
In this embodiment, the mechanical hysteresis angle is a main influencing factor of the unbalanced force angle in the dynamic balance test process, the magnitude of the mechanical hysteresis angle is related to not only the supporting characteristic of the rotor of the device, but also the critical rotation speed of the rotor itself and the relationship of the required balance rotation speed, the corresponding value range of the mechanical hysteresis angle can be determined according to the critical speed of the rotor and the relationship of the balance rotation speed, and a trial addition angle range is determined according to the value range of the mechanical hysteresis angle.
Step S106, if the first balance calibration data does not meet the preset vibration amplitude range, correcting the weight value according to the vibration change before and after the weight and recording the vibration data after the weight is corrected, wherein the vibration data after the weight is corrected is second balance correction data.
The correction weight value according to the vibration change before and after the weight comprises:
calculating a dynamic balance influence coefficient through vibration data before and after the counterweight, and calculating the mass to be added according to the dynamic balance influence coefficient and the original vibration data A0;
the mass to be added is set as M ′ The dynamic balance influence coefficient is&The first dynamic balance correction data is A1,
again testing the angle on the basis of alpha, wherein the total angle after testing is alpha ′ Based on M ′ And alpha ′ And (5) re-weighting.
In this embodiment, since the test mass and angle often cannot make the vibration data reach the preset requirement, the weight value is also required to be corrected, and the dynamic balance influence coefficient can be calculated according to the original data before the weight and the first balance correction data of the free end and the driving end after the weight, the dynamic balance influence coefficient cannot be changed along with the change of the weight, and the mass actually to be added in the dynamic balance correction of the device can be directly calculated according to the dynamic balance influence coefficient and the original data.
When the weight value is corrected, the mass and angle should be increased again based on the mass and angle to be tested. In the correction process, the vibration amplitude values of the free end and the driving end are reduced, the difference value of the vibration amplitude values of the free end and the driving end is also reduced, and when the vibration amplitude values of all ends are lower than the corresponding preset threshold value, and the difference value of the vibration amplitude values of the two ends is lower than the difference value of the preset vibration amplitude values of the two ends, the balance correction is finished and the preset requirement is met.
By applying the technical scheme, the total allowable unbalance of the rotor of the condensate pump motor and the allowable unbalance of the left correction surface and the right correction surface are calculated; if the residual unbalance amounts of the two correction surfaces are higher than the corresponding allowable unbalance amounts, carrying out balance correction; respectively determining the quality of balance cement required by the left correction surface and the right correction surface and correspondingly pasting the balance cement; testing the balance-weight-free vibration of the condensate pump motor, and judging whether the balance-weight-free vibration data meet a preset vibration amplitude range or not; if the vibration data do not meet the first balance calibration data, carrying out weight balancing on the rotor of the condensate pump motor, testing and recording the vibration data after weight balancing, and taking the vibration data as first balance calibration data; if the first balance calibration data does not meet the preset vibration amplitude range, correcting the weight value according to the vibration change before and after the weight, recording the vibration data after the weight is corrected, and starting the machine to detect the vibration data as second balance correction data. According to the method, dynamic balance of the condensate pump is detected, the balance weight is efficiently and accurately carried out according to the detection result and the condition of equipment, and the difference value between the working rotation speed and the balance rotation speed of the motor is detected and adjusted before the balance weight, so that the balance rotation speed is matched with the working rotation speed in the balance process, the balance precision is improved, the vibration and the noise of the equipment are reduced, and the service life of the equipment is prolonged.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. A method for testing dynamic balance of a condensate pump, the method comprising:
calculating total allowable unbalance of a rotor of the condensate pump motor, distributing the total allowable unbalance to left and right correction surfaces of the rotor, and calculating allowable unbalance of the left and right correction surfaces respectively;
detecting residual unbalance amounts of the left correction surface and the right correction surface through a balancing machine, and carrying out balance correction on the condensate pump motor if the residual unbalance amounts of the left correction surface and the right correction surface are higher than the corresponding allowable unbalance amounts, wherein the balance correction comprises: pasting balance cement and a counterweight;
the paste balancing daub comprises:
determining the quality of balance cement required by the left correction surface and the right correction surface according to the residual unbalance amount of the left correction surface and the right correction surface and the corresponding allowable unbalance amount respectively, and correspondingly pasting the balance cement;
the counterweight includes:
testing the balance-weight-free vibration of the condensate pump motor, and judging whether the balance-weight-free vibration data meet a preset vibration amplitude range or not;
if the vibration data without the counterweight does not meet the preset vibration amplitude range, carrying out counterweight on the rotor of the condensate pump motor, testing and recording the vibration data after counterweight, wherein the vibration data after counterweight is first balance calibration data;
if the first balance calibration data does not meet the preset vibration amplitude range, correcting the weight value according to the vibration change before and after the weight and recording vibration data after the weight is corrected, wherein the vibration data after the weight is corrected is second balance correction data;
and controlling the motor to operate based on the second balance correction data and monitoring a dynamic balance correction result in real time.
2. The method of claim 1, wherein calculating the total allowable unbalance of the rotor of the condensate pump comprises:
calculating the unbalance of the rotor, and calculating the total unbalance of the rotor according to the unbalance;
wherein e per Representing unbalance of rotor, S u Representing unbalanced intensity, w 0 Represents the highest angular velocity of the rotor, n 0 Representing the highest rotation speed of the rotor;
U per ＝e per m
wherein U is per Representing the total unbalance of the rotor, m representing the mass of the rotor.
3. The method according to claim 2, wherein the distributing the total allowable unbalance amount to the left and right correction surfaces of the rotor and calculating the allowable unbalance amounts of the left and right correction surfaces, respectively, includes:
let the ratio of the allowable unbalance amounts of the left and right correction surfaces of the rotor be D
；
；
Wherein U is per1 Indicating the allowable unbalance amount of the left correction surface, U per2 Indicating the allowable unbalance amount of the right correction surface.
4. The method according to claim 3, wherein the determining the mass of the balance cement required for the two correction surfaces based on the residual unbalance amounts of the two correction surfaces and the corresponding allowable unbalance amounts, respectively, comprises:
setting the residual unbalance of the left correction surface as P, and presetting a residual unbalance array (P1, P2, P3 and P4) of the left correction surface, wherein P1, P2, P3 and P4 are all preset values, and P1 is more than P2 and less than P3 and less than P4;
setting the difference between the residual unbalance amount and the allowable unbalance amount of the left correction surface as L, presetting an array (L1, L2, L3, L4) of the difference between the residual unbalance amount and the allowable unbalance amount of the left correction surface, wherein L1, L2, L3, L4 are all preset values, and L1=P1-U per1 ，L2＝P2-U per1 ，L3＝P3-U per1 ，L4＝P4-U per1 L1 is more than L2 and less than L3 and less than L4;
setting the mass of the balance adhesive cement required by the left correction surface as M, and presetting mass arrays (M1, M2, M3 and M4) of the balance adhesive cement required by the left correction surface, wherein M1, M2, M3 and M4 are all preset values, and M1 is more than M2 and less than M3 and less than M4;
selecting the quality of balance cement required by the left correction surface according to the difference value interval of the left correction surface residual unbalance and the allowable unbalance;
if L is less than L1, selecting M1 as the mass of the balance cement required by the left correction surface;
if L1 is less than L2, selecting M2 as the mass of the balance cement required by the left correction surface;
if L2 is less than L3, selecting M3 as the mass of the balance cement required by the left correction surface;
if L3 is less than L4, selecting M4 as the mass of the balance cement required by the left correction surface.
5. The method for testing dynamic balance of a condensate pump according to claim 1, wherein said testing non-weighted vibration of a condensate pump motor and determining whether non-weighted vibration data satisfies a predetermined vibration amplitude range comprises:
the method comprises the steps that a speed sensor is respectively arranged at the free end and the driving end of a condensate pump motor rotor, vibration measuring points are arranged at the free end and the driving end of the condensate pump motor rotor, vibration amplitude values and phase values at the vibration measuring points when the condensate pump motor is not provided with a counterweight at different moments are detected through a vibration analyzer, and the average value of the vibration amplitude values of the free end and the average value of the vibration amplitude values of the driving end at different moments and the average value of all phase values of the free end and the driving end at different moments are calculated;
the average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end and the average value of all phase values of the free end and the driving end at different moments without the counterweight are the original data A0;
if the average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end are higher than the corresponding preset vibration amplitude threshold, and the difference between the average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end is greater than the difference between the preset vibration amplitude threshold of the free end and the preset vibration amplitude threshold of the driving end, the original data A0 does not meet the preset vibration amplitude range when no counterweight exists.
6. The method of testing dynamic balance of a condensate pump of claim 1, further comprising: adjusting the operating speed of the motor and determining a balance speed matching the operating speed, comprising:
setting the working rotation speed of a motor rotor as C, presetting a working rotation speed C matrix array (C1, C2, C3 and C4), wherein C1, C2, C3 and C4 are all preset values, and C1 is more than C2 and less than C3 and less than C4;
let the balance rotation speed of the motor be V2,
；
wherein G is the precision grade, r is the correction radius, and x is the unbalanced qualification;
if the difference value between the balance rotating speed V2 of the motor and the working rotating speed C is larger than a preset difference value threshold, adjusting the working rotating speed C according to the difference value, and determining the balance rotating speed of the motor again according to the adjusted working rotating speed;
the adjusting the working rotation speed C according to the difference value comprises the following steps:
the difference value between the balance rotating speed V2 and the working rotating speed C is V2-C, the difference threshold value between the balance rotating speed and the working rotating speed is B, and a difference matrix array (B1, B2, B3 and B4) is preset, wherein B1, B2, B3 and B4 are all preset values, and B1 is more than B2 and less than B3 and less than B4;
setting the adjustment quantity of the working rotation speed as E, and presetting a matrix array (E1, E2, E3 and E4) of the adjustment quantity of the working rotation speed, wherein E1, E2, E3 and E4 are all preset values, and E1 is more than E2 and less than E3 and less than E4;
according to the relation between the difference V2-C and a preset difference threshold matrix B, selecting a corresponding working rotation speed adjustment quantity to adjust the ith preset working rotation speed;
if V2-C is larger than B4, selecting a preset adjustment quantity E1 to correct the ith preset working rotation speed, wherein the corrected working rotation speed adjustment quantity is E1;
if B3 is less than V2-C is less than B4, selecting a preset adjustment quantity E2 to correct the ith preset working rotation speed, wherein the corrected working rotation speed adjustment quantity is E2 x Ci;
if B2 is less than V2-C is less than B3, selecting a preset adjustment quantity E3 to correct the ith preset working rotation speed, wherein the corrected working rotation speed adjustment quantity is E3 x Ci;
if B1 is smaller than V2-C is smaller than B2, selecting a preset adjustment quantity E4 to correct the ith preset working rotating speed, wherein the corrected working rotating speed adjustment quantity is E4. Ci.
7. The method for testing dynamic balance of a condensate pump according to claim 5 or 6, wherein the balancing the condensate pump motor rotor, testing and recording the weighted vibration data, wherein the weighted vibration data is first balance calibration data, comprises:
the counterweight includes a trial mass and a trial angle, the trial mass including:
determining the centrifugal force of the rotor after the test-adding mass according to the rotational inertia of the rotor of the motor, and calculating the test-adding mass of the rotor according to the centrifugal force;
setting the moment of inertia of a rotor as J, and presetting moment of inertia arrays (J1, J2, J3 and J4), wherein J1, J2, J3 and J4 are all preset values, and J1 is more than J2 and J3 is more than J4;
setting the centrifugal force after the rotor is subjected to trial mass as F, and presetting a centrifugal force array (F1, F2, F3 and F4) after the rotor is subjected to trial mass, wherein F1, F2, F3 and F4 are all preset values, and F1 is more than F2 and less than F3 and less than F4;
selecting centrifugal force after the test mass is added according to the interval of the rotor moment of inertia;
if J is less than J1, F1 is selected as the centrifugal force after the mass is added;
if J1 is less than J2, F2 is selected as centrifugal force after the mass is tested;
if J2 is less than J3, F3 is selected as centrifugal force after the mass is tested;
if J3 is less than J4, F4 is selected as centrifugal force after the mass is tested;
let the trial mass of the rotor be M 0 Then
；
Wherein a is the centripetal acceleration of the rotor;
trial mass M 0 Detecting vibration amplitude values and phase values of the free end and the driving end at different moments at the vibration measuring points again, and calculating an average value of the vibration amplitude values of the free end and the driving end at different moments and an average value of all phase values of the free end and the driving end at different moments; trial mass M 0 The average value of the vibration amplitude of the free end and the average value of the vibration amplitude of the driving end at different moments and the average value of all phase values of the free end and the driving end are first balance correction data;
the trial addition angle includes:
determining the range of a mechanical hysteresis angle according to the relation between the critical rotating speed and the balance rotating speed of the motor rotor, and calculating the trial addition angle of the rotor according to the mechanical hysteresis angle;
setting the critical speed of a motor rotor as V1, the mechanical hysteresis angle as beta, the trial addition angle as alpha, and the average value of all phase values of the free end and the driving end at different moments without counterweight as theta;
selecting a corresponding mechanical hysteresis angle range according to the relation between the critical rotation speed V1 and the balance rotation speed V2;
when V1 is more than or equal to V2, beta is more than 0 and less than or equal to 90 degrees;
when V1 is less than V2, 90 degrees is less than beta which is less than 180 degrees;
the trial addition angle alpha of the rotor is calculated from the mechanical hysteresis angle beta,
α＝θ-β+180°。
8. the method of claim 7, wherein the correcting the weight value according to the vibration variation before and after the weight comprises:
calculating a dynamic balance influence coefficient through vibration data before and after the counterweight, and calculating the mass to be added according to the dynamic balance influence coefficient and the original vibration data A0;
the mass to be added is set as M', the dynamic balance influence coefficient is &, the first dynamic balance correction data is A1,
；
；
the angle is again tried on the basis of alpha, and the total angle after the trial is alpha ', and the weight is re-weighted based on M ' and alpha '.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310985078.2A CN117231490A (en) | 2023-08-04 | 2023-08-04 | Dynamic balance test method for condensate pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310985078.2A CN117231490A (en) | 2023-08-04 | 2023-08-04 | Dynamic balance test method for condensate pump |
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| Publication Number | Publication Date |
|---|---|
| CN117231490A true CN117231490A (en) | 2023-12-15 |
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|---|---|---|---|
| CN202310985078.2A Withdrawn CN117231490A (en) | 2023-08-04 | 2023-08-04 | Dynamic balance test method for condensate pump |
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| Country | Link |
|---|---|
| CN (1) | CN117231490A (en) |
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2023
- 2023-08-04 CN CN202310985078.2A patent/CN117231490A/en not_active Withdrawn
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Application publication date: 20231215 |