CN1020958C - Method for testing dynamic balance of centrifugal blower at worksite - Google Patents
Method for testing dynamic balance of centrifugal blower at worksite Download PDFInfo
- Publication number
- CN1020958C CN1020958C CN 91103992 CN91103992A CN1020958C CN 1020958 C CN1020958 C CN 1020958C CN 91103992 CN91103992 CN 91103992 CN 91103992 A CN91103992 A CN 91103992A CN 1020958 C CN1020958 C CN 1020958C
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- balance
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 title claims abstract description 6
- 238000006467 substitution reaction Methods 0.000 claims description 9
- 230000007306 turnover Effects 0.000 claims description 5
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000012937 correction Methods 0.000 abstract description 2
- 230000001052 transient effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
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Abstract
The present invention relates to field dynamic balance technology of a centrifugal ventilator, which is a new dynamic balance method which is suitable for all the centrifugal ventilators. When balance is carried out according to the method of the present invention, vibration signals measured by a sensor under a working rotary speed are input into a phase instrument, and the sensor is arranged beside a front bearing; the phases of the vibration signals are displayed by the phase instrument; the phase values of the vibration signals are respectively measured through secondary trial weighting, and thus, high-speed and high-precision balance can be achieved in a production field. The present invention has the advantages of high testing speed, high balance precision, simple configuration and convenient control, and is convenient for the execution of field balance in a usage factory of the centrifugal ventilator; besides, the present invention can be used by a centrifugal ventilator factory to carry out balance correction before the centrifugal ventilators leave the factory.
Description
The invention belongs to the dynamic balancing technique of centrifugal fan, it is applicable to centrifugal fan manufacturing plant and the dynamic balance method that carries out at use factory scene.
Usually the impeller transient equilibrium of centrifugal fan is carried out on the horizontal dynamic balancing machine of common low speed, and there is following shortcoming in this kind balance method:
1. because when on dynamic balancing machine, draught fan impeller being carried out balance, often be not with its rotating shaft to carry out together, carry out balance but impeller is contained on the mandrel that balance uses, because balance is often inconsistent with the deviation of fan shaft with mandrel, they are also inconsistent with the assembling deviation of impeller, and these factors cause the decline of real balance precision.
2. because draught fan impeller is a welded structure, again without the thermal treatment of eliminating welding stress, thereby in use for some time, will produce tangible distortion after the welding, cause the decline of balance quality, cause high vibration.And the use factory of general centrifugal fan does not often have dynamic balancing machine, carries out balance correction again so impeller must be delivered to blower fan manufacturing plant, and this has not only increased maintenance cost, and can seriously influence production.
Method provided by the invention its objective is to overcome effectively in the past on dynamic balancing machine that the centrifugal fan impeller is carried out dynamic balance accuracy is lower and be not easy to use the factory scene to carry out dynamically balanced drawback at blower fan.The required instrument of this method is few, and is simple to operate, can directly carry out transient equilibrium at the scene of using to centrifugal blower fan blade wheel quickly and accurately.
The centre point of the technology of the present invention is the position that vibration-measuring sensor is placed in close blower fan front bearing, and the vibration signal that obtains with original vibration signal and after examination increases the weight of is sent into PH phasemeter respectively and is shown phase place, through data processing, determine to add weight and increase the weight of the position, heavy through weldering on impeller again, just can realize the transient equilibrium of centrifugal fan.
Advantage of the present invention:
1. apparatus structure is simple especially, only needs the PH phasemeter of a routine to be equipped with vibration-measuring sensor (need not vialog) and just can carry out spot dynamic balance.Thereby reduced investment, instant effect, be easy to apply.
2. be applicable to that blower fan use scene carries out transient equilibrium, the high required time of balance quality is short.
Description of drawings:
Fig. 1 is a principle schematic of the present invention.
The meaning of symbol among the figure:
0-original amplitude;
1-examination for the first time increases the weight of the amplitude that records behind the G;
2The amplitude that recorded after-the second time, examination increased the weight of;
-examination increases the weight of the amplitude that G produces separately; φ
0The phase place of-original vibration; φ
1-
1With
0Between phase differential; φ
2-
2With
0Between phase differential.
Fig. 2 is a centrifugal fan impeller dynamic poise device structural representation of the present invention.
Symbolic significance among the figure: 1-draught fan impeller; The 2-vibration-measuring sensor; The 3-PH phasemeter; The 4-motor.
With reference to description of drawings design of the present invention and concrete operations step:
In order to illustrate that the present invention carries out dynamic balance method to centrifugal blower fan blade wheel, be necessary design principle of the present invention to be described with reference to Fig. 1.
Suppose that there is amount of unbalance in centrifugal blower fan blade wheel, under its working speed, record original vibration amplitude
0And angle phi
0, the arbitrfary point adds test mass G on the circumference of certain impeller radius R then, records its vibration amplitude to be under working speed
1, its phasing degree is φ
0+ φ
1As can be known
1With
0Between phase differential be φ
1And
1=
0+
, promptly
1It is the amplitude that original unbalance produces
0Increase the weight of the amplitude that G produces separately with examination for the first time
Net amplitude.Take off test mass G then, and it is added on the circumference of same radius R from former increases the weight of to turn on 180 ° the point, under working speed, record
2With its angle phi
0-φ
2, φ
2For
2With
0Between phase differential.
2Be
0With examination for the second time increase the weight of the amplitude that G produces separately-
The amplitude of resultant vibration, from the vector principle as can be known
With-
Opposite sign but equal magnitude, promptly DCE should be positioned on the straight line.
Utilize above-mentioned each parameter that records to make Fig. 1, its step is as follows:
1. by the original amplitude that records
0And angle phi
0, be that initial point is done with O
, make
=
0;
2. by the amplitude that records after examination increases the weight of for the first time
1And angle phi
0+ φ
1, be that initial point is done with O
, make
=
1;
3. by the amplitude that records after examination increases the weight of for the second time
2And angle phi
0-φ
2, be that initial point is done with O
, make
=
2;
4. connect DCE, D, C, E are positioned on the straight line as mentioned above, and DC=CE.
Fig. 1 completes through above-mentioned steps, and Fig. 1 only is for analyzing method schematic diagram of the present invention, and in fact this method needn't be measured described
0,
1,
2Deng amplitude, only need to measure the respective phase angle and can finish task of the present invention, thereby need not vialog with PH phasemeter, this is an important feature of the present invention.
Specifically introducing before this balance method and the step, derive how to represent amount of unbalance earlier with the phasing degree.
Can draw following relational expression by sine from Fig. 1:
And
Because of φ
5=180 °-φ
3And φ
6=180 °-(φ
2+ φ
3), can get
φ
6＝φ
3-φ
2（3）
Can get by △ ODC
φ
4＝180°-（φ
1+φ
3） （4）
With (4) substitution (1), can get
With (3) substitution (2), can get
Can get by formula (6)
(7) formula represents that the amplitude of original unbalance W generation increases the weight of the ratio of the amplitude of G generation with examination.Owing between W and G and the corresponding amplitude approximate linear is arranged, can get
(7) formula and (8) formula are merged, just
W=G (sin (φ
3-φ
2)〕)/(sinφ
2) (9)
By (9) formula as can be known a demand get φ
2And φ
3Can increase the weight of G according to examination and try to achieve amount of unbalance W.As previously mentioned, φ
2Can directly record, and φ
3Can convert and try to achieve.
(5) formula and (6) formula are merged, can get
(sin〔180°- (φ
1+φ
3)〕)/(sinφ
1) = (sin (φ3-φ
2)〕)/(sinφ
2)
Following formula is launched, can get
(sinφ
1cosφ3+cosφ
1sinφ
3)/(sinφ
1) = (sinφ
3cosφ
2-cosφ
3sinφ
2)/(sinφ
2)
Simplify
cosφ
3+cotφ
1sinφ
3＝sinφ
3cotφ
2-cosφ
3
The both members quilt is divided by sin φ
3,
Cotφ
3+Cotφ
1＝Cotφ
2-Cotφ
3
So φ
3=Cot
-1((Cot φ
2-Cot φ
1))/2) (10)
This shows, as long as the φ that will try to achieve by (10) formula
3Substitution (9) formula then needs only the φ that tries to achieve by aforementioned testing procedure
1And φ
2, just can try to achieve original unbalance W.Like this, as shown in Figure 1,, this W turns over the angle φ that calculates by (10) formula again as long as being added in the position of trying for the first time to increase the weight of in the edge
3On the position at place, then the vibration of this W generation together
0Equal and opposite in direction, direction is opposite, thereby amount of unbalance is eliminated.
From the above, employed A among Fig. 1
0, A
1, A
2Deng the vibration amplitude value, only be to introduce when the principle of this kind balance method is analyzed, in the real balance process, needn't measure fully.
Below narrate balance method of the present invention and operation steps:
1. by the wiring work of finishing instrument shown in Figure 2, vibration-measuring sensor 2 is placed on the motor near front bearing, (, but then vibration-measuring sensor can be placed in the front-end bearing pedestal place when being fixed on the main shaft of bearing seat) if draught fan impeller 1 is not directly to be fixed on the rotor of motor 4.
The vibration signal of vibration-measuring sensor impression is transformed into electric signal and sends into PH phasemeter 3 and show the respective phase value.
2. the angle phi when under working speed, recording draught fan impeller and having original unbalance
0
3. shut down.
4. examination is increased the weight of G and be added on the arbitrfary point on the circumference that radius is R, and put signs on " 1 ".
5. under above-mentioned working speed, record angle phi
0+ φ
1, try to achieve φ
1Value.
6. shut down.
7. G being taken off and it is added in along radius is that the circumference of R is increased the weight of to locate to turn over by examination for the first time on 180 ° the position, and put signs on " 2 ".
8. under above-mentioned working speed, record φ
0-φ
2, try to achieve φ
2Value.
9. with φ
1And φ
2Substitution (10) formula is tried to achieve φ
3
10. examination is increased the weight of G value and φ
2, φ
3Substitution (9) formula can be tried to achieve original unbalance W value.
Turn over angle φ 11. this W value is added in the position set that increases the weight of from examination for the first time along the circumference of radius R
3(it turns to is that 2 phasing degree that record turn over φ to the direction at 5 phasing degree that record set by step set by step at the place
3The angle).
12. this W value is welded in by step 11 determines that then transient equilibrium is finished on the impeller of position.
Summary procedure is weaved in above-mentioned transient equilibrium be stored in the computing machine, then only need computing machine is sent at the phasing degree that each time records successively, just can directly show the size and location of amount of unbalance.
Application the present invention carries out transient equilibrium to the centrifugal fan impeller and has obtained desirable effect, can obtain explanation from following example.
A centrifugal blower working speed is 3000r, p, m as shown in Figure 2, is A by recording amplitude on the motor bearings
0=168 μ, its angle phi
0=55 °; Examination increases the weight of G=20g and is added in radius R=20cm place, records angle phi under rotating speed 3000r, p, m
0+ φ
1=140 °, get φ
1=85 °; After the shutdown, examination is increased the weight of G move 180 ° along the circumference of radius R, and the angle phi when recording rotating speed and being 3000r, p, m
0-φ
2=35 °, get φ
2=20 °, with φ
1And φ
2Substitution (10) formula,
φ3＝Cot
-1( (Cotφ
2-Cotφ
1)/2 )=Cot
-1( (Cot20°-Cot85°))/2 )
＝37.4°
Will °
3Value substitution (9) formula gets
W=G (sin(φ
3-φ
2))/(sinφ
2) =20 (sin(37.4°-20°))/(sin20°)
=17.5g
Gained W value is added in increases the weight of the position from examination for the first time and turn over 37.4 ° of angles along the radius R circumference, its turn to be from the phasing degree that records for the first time (°
0=55 °) phasing degree that records to the second time (°
0+ °
1=140 °) direction, promptly accuse through the above-mentioned steps balance and to finish.
Through actual measurement, amplitude is reduced to 7 μ after the balance, and effect is very desirable.
Claims (1)
1, a kind of method for testing dynamic balance of centrifugal blower at worksite is characterized in that being undertaken by following equilibrium step:
(1) vibration-measuring sensor [2] is placed on the motor near front bearing,, but then vibration-measuring sensor can be placed in the front-end bearing pedestal place when being fixed on the main shaft of bearing seat if draught fan impeller [1] is not directly to be fixed on the rotor of motor [4].Vibration-measuring sensor [2] is connected with PH phasemeter [3];
(2) under working speed, vibration-measuring sensor experience the vibration signal that the original unbalance by draught fan impeller causes and be transformed into electric signal send into PH phasemeter [3] show angle phi
0
(3) shut down;
(4) examination is increased the weight of G and be added on the arbitrfary point of certain impeller radius R circumference, and put signs on " 1 ";
(5) under with above-mentioned the same working speed, record angle phi
0+ φ
1, try to achieve φ
1Value;
(6) shut down;
(7) G is taken off and with its be added in increase the weight of to locate to turn over 180 ° position by examination for the first time along the circumference of radius R on, and put signs on " 2 ";
(8) under same working speed, record the angle phi of this moment
0-φ
2, try to achieve φ
2
(9) with φ
1And φ
2The substitution following formula
φ
3=Cot
-1((Cot φ
2-Cot φ
1)/2), try to achieve φ
3
(10) examination is increased the weight of G value and φ
2, φ
3The substitution following formula
W=G (sin (φ
3-φ
2))/(sin φ
2), try to achieve amount of unbalance w value;
(11) this amount of unbalance W is added in the position set that increases the weight of from examination for the first time and turns over angle φ along the circumference of radius R
3The place, it turns to set by step the direction at the phasing degree that phasing degree that (2) record records to (5) set by step to change;
(12) by (11) determined position, the w value is welded on the draught fan impeller, balance is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103992 CN1020958C (en) | 1991-06-10 | 1991-06-10 | Method for testing dynamic balance of centrifugal blower at worksite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103992 CN1020958C (en) | 1991-06-10 | 1991-06-10 | Method for testing dynamic balance of centrifugal blower at worksite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1058096A CN1058096A (en) | 1992-01-22 |
| CN1020958C true CN1020958C (en) | 1993-05-26 |
Family
ID=4906367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91103992 Expired - Fee Related CN1020958C (en) | 1991-06-10 | 1991-06-10 | Method for testing dynamic balance of centrifugal blower at worksite |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1020958C (en) |
Cited By (1)
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|---|---|---|---|---|
| CN101749256B (en) * | 2010-01-08 | 2013-11-13 | 浙江大学 | Large axial flow fan unbalance recognition method based on auto-correlation |
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| CN101915640B (en) * | 2010-08-02 | 2011-12-28 | 浙江大学 | Biaxial adaptive dynamic balance executing method for centrifuge |
| CN102749172B (en) * | 2012-06-14 | 2016-05-04 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of test weight mass that is applied to online processing fan rotor unbalance dynamic problem is determined method |
| CN102943780B (en) * | 2012-12-04 | 2015-05-20 | 吴小江 | Fan impeller levelling balancing device |
| CN103234703B (en) * | 2013-04-24 | 2015-08-05 | 莱芜钢铁集团有限公司 | A kind of dual-threshold detection method solving fan vibration |
| CN105157637A (en) * | 2015-06-06 | 2015-12-16 | 合肥铭锋模具铸造有限公司 | Tester |
| CN110261037A (en) * | 2019-07-09 | 2019-09-20 | 中国航发哈尔滨东安发动机有限公司 | A kind of eccentric contract dynamic balancing tooling and method with metallic sponge |
-
1991
- 1991-06-10 CN CN 91103992 patent/CN1020958C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101749256B (en) * | 2010-01-08 | 2013-11-13 | 浙江大学 | Large axial flow fan unbalance recognition method based on auto-correlation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1058096A (en) | 1992-01-22 |
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