CN101788354B - Hot vacuum environment test moment value correction method - Google Patents
Hot vacuum environment test moment value correction method Download PDFInfo
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- CN101788354B CN101788354B CN2010100397272A CN201010039727A CN101788354B CN 101788354 B CN101788354 B CN 101788354B CN 2010100397272 A CN2010100397272 A CN 2010100397272A CN 201010039727 A CN201010039727 A CN 201010039727A CN 101788354 B CN101788354 B CN 101788354B
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- fluid sealing
- moment
- magnet fluid
- sealing axle
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Abstract
The invention relates to a hot vacuum environment test moment value correction method. Two identical magnetofluid sealing shafts are coaxially arranged at both sides of a vacuum tank, and a torque sensor is respectively arranged on the two magnetofluid sealing shafts. The method comprises the following steps: firstly, testing the friction moment of each magnetofluid sealing shaft at the normal temperature and the normal pressure; then, testing the total friction moment of the two magnetofluid sealing shafts as a whole body in hot vacuum environment through directing connecting the two magnetofluid sealing shafts; and calculating the friction moment variable quantity of the two magnetofluid sealing shafts at the normal temperature and the normal pressure in the hot vacuum environment through the above two test results. Thereby, the value of the friction moment of each magnetofluid sealing shaft in the hot vacuum environment can be obtained. The invention provides the hot vacuum environment test moment value correction method which can effectively correct the moment value.
Description
Technical field
The present invention relates to hot vacuum environment parameter testing field, especially a kind of moment value correction method.
Background technology
Thermal vacuum test is meant the vacuum in the space, cold black and solar radiation environment, i.e. a kind of test of the function of certifying organization or device and performance under specified vacuum and thermal cycle conditions.Usually tested mechanism or device are put into vacuum tank, realize required environment through special-purpose thermovacuum equipment.In thermal vacuum test, the index that the test of the moment of mechanism or device is very important often.
Because tested mechanism or device be in hot vacuum environment, because common sensor can't normally use under hot vacuum environment, so the measurement that is easy under the normal temperature and pressure to accomplish is just very difficult.Comprise in the sensor can and jar outer two kinds of solutions.The scheme of jar build-in test is meant sensor is placed in the vacuum tank and is connected with measured piece.Test is meant through the magnet fluid sealing axle and transmits torque to the vacuum tank outside outside jar, outside vacuum tank, and the method that promptly the dress sensor is tested under the normal temperature and pressure environment.During the jar build-in test, simple proposal is directly outside torque sensor, to adopt the heat-barrier material insulation to measure.Because sensor is not specially for vacuum environment design, so sensor is easy to damage, and just can't carry out in case damage is tested.On the other hand, transducer calibration is carried out at normal temperatures and pressures, and same torque is different in hot vacuum environment lower sensor output valve, and the demarcation of vacuum environment lower sensor is difficult to carry out, so the test data confidence level is worth suspecting.
Another kind of scheme is the sensor that is applicable to hot vacuum environment of design special.But this method relates to many-sided problems such as Sensor Design, processing, installation, amount biography, demarcation, especially almost can't realize for the high precision torque sensor.Because sensor directly is connected with measured piece when measuring in jar, the torque testing path is short, do not have damping and other loss of extra increase, so test value can directly react the moment values of tested mechanism or device.But the own precision of sensor under the hot vacuum environment maybe be relatively poor simultaneously.Great majority test at present all adopts the mode of jar outer sensor installation to realize.
The magnet fluid sealing axle adopts magnetic fluid as sealing, have the conventional seals mode the advantage that can not compare.Packoff is made up of permanent magnet, magnetic pole, magnetic loop, magnetic fluid and axle.Gap between magnetic pole and the turning axle becomes seal clearance, and portion charges into magnetic fluid within it.The magnetic field of permanent magnet is through seal clearance.Because magnetic field is the strongest under the pole tip, thereby magnetic fluid concentrates on the pole tip place, in seal clearance, forms liquid " O " V-shaped ring.Separate thereby will encircle both sides, play the effect of sealing.Magnetic fluid in the magnetic field receives the effect of magnetic field force, does the time spent in no external force, and magnetic fluid will remain in the strongest zone, magnetic field.Under the effect of external force, the position of magnetic fluid and shape will change, and cause the variation of magnetic field force, and magnetic field force and external force balance each other.Make magnetic fluid be in new equilibrium state.
Summary of the invention
In order to overcome the deficiency that can't effectively revise moment values of existing hot vacuum environment parameter test system, the present invention provides a kind of hot vacuum environment test moment value correction method that can effectively revise moment values.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of hot vacuum environment test moment value correction method; Two coaxial both sides that are installed in vacuum tank of identical magnet fluid sealing axle; Said two magnet fluid sealing axles are respectively installed a torque sensor, and the first left-hand rotation square sensor is installed in a magnet fluid sealing axle left side, and the first right torque sensor is installed on a magnet fluid sealing axle right side; The said first left-hand rotation square sensor is positioned at outside the jar, and the said first right torque sensor is positioned at jar; The second left-hand rotation square sensor is installed in the left side of another root magnet fluid sealing axle, and the second right torque sensor is installed on another root magnet fluid sealing axle right side, and the said second left-hand rotation square sensor is positioned at jar, and the said second right torque sensor is positioned at outside the jar; Said moment value correction method may further comprise the steps:
(1), at normal temperatures and pressures, a magnet fluid sealing axle is connected with driving mechanism, and another root magnet fluid sealing axle is connected with load maintainer, measures the difference N ' of the first left-hand rotation square sensor and the first right torque sensor
a, another root magnet fluid sealing axle is connected with driving mechanism, and a magnet fluid sealing axle is connected with load maintainer, measures the difference N ' of the second right torque sensor and the second left-hand rotation square sensor once more
b, wherein:
N′
a＝N
a1+N′
a2
N′
b＝N
b1+N′
b2
In the following formula, N
A1Be the moment of friction of the left side generation of a magnet fluid sealing axle, this moment of friction is operated under the normal temperature and pressure environment outside jar; N '
aBe the moment of friction that a magnet fluid sealing axle right side produces, be operated under the normal temperature and pressure environment; N
B1Be the moment of friction of the right side generation of another root magnet fluid sealing axle, this moment of friction is outside jar, and work at normal temperatures and pressures; N '
bMoment of friction for the left side of another root magnet fluid sealing axle produces is operated under the normal temperature and pressure environment;
(2), special axis of processing; The two ends of special axis connect with a magnet fluid sealing axle and another root magnet fluid sealing axle respectively; A magnet fluid sealing axle is connected with driving mechanism, and another root magnet fluid sealing axle is connected with load maintainer, measures the difference N of two torque sensors
Ab:
N
ab＝N
a1+N
a2+N
b1+N
b2
N
A1Be the moment of friction of the left side generation of a magnet fluid sealing axle, this moment of friction is outside jar, and work at normal temperatures and pressures; N
A2Be the moment of friction that a magnet fluid sealing axle right side produces, be operated under the hot vacuum environment; N
B1Be the moment of friction of the right side generation of another root magnet fluid sealing axle, this moment of friction is outside jar, and work at normal temperatures and pressures; N
B2Moment of friction for the left side of another root magnet fluid sealing axle produces is operated under the hot vacuum environment;
(3), the moment of friction value sum of two axles of (1) pacing amount and the total frictional force square value of (2) pacing examination are subtracted each other, be defined as Δ N and obtain:
ΔN＝(N′
a+N′
b)-N
ab
＝(N
a1+N′
a2+N
b1+N′
b2)-(N
a1+N
a2+N
b1+N
b2)
＝(N′
a2-N
a2)+(N′
b2-N
b2)
＝ΔN
a+ΔN
b
Δ N representes the moment total variation of two magnet fluid sealing axles under normal temperature and pressure and hot vacuum environment; Set Δ N
a=Δ N
b=Δ N/2 obtains thus:
N
a＝N′
a+ΔN/2
N
b＝N′
b+ΔN/2
Obtain N
aAnd N
bBe the moment of friction values of two magnet fluid sealing axles under hot vacuum environment.
Technical conceive of the present invention is: the present invention is based on a jar outer test mode.Because during jar outer sensor installation, the transmission of torque route is long, the centre must be connected to outside the vacuum tank through the magnet fluid sealing axle, and the moment of friction that the moment values of testing outside therefore jar comprises the magnet fluid sealing axle is interior.In the moment of friction influence of carrying out to eliminate when high precision moment is measured the magnet fluid sealing axle, promptly the sensor test data are carried out suitable correction.
The moment of friction of magnet fluid sealing axle comes from two aspects, is to adopt the moment that magnet fluid sealing produced on the one hand, is that fixedly respectively there is a moment of friction that bearing produced at magnet fluid sealing axle two ends on the other hand.Moment of friction under normal temperature and pressure and hot vacuum environment can change and since jar in can't sensor installation, this moment of friction value that has just determined the magnet fluid sealing axle under hot vacuum environment to produce can't directly be obtained through the method for testing.
The method that the present invention adopts is to utilize two coaxial identical magnet fluid sealing axles of vacuum tank both sides to realize; At first test each magnet fluid sealing axle moment of friction down through normal temperature and pressure; Then through two magnet fluid sealing axles are directly connected; Test two magnet fluid sealing axles do as a whole under hot vacuum environment the moment of friction of testing total, by two magnet fluid sealing axles of top twice test result calculations under the hot vacuum environment with normal temperature and pressure under the moment of friction variable quantity.Can obtain the moment of friction value of each magnet fluid sealing axle under hot vacuum environment thus.
Beneficial effect of the present invention mainly shows: can effectively revise moment values.
Description of drawings
Fig. 1 is a structural representation of measuring the total frictional force square under the normal temperature and pressure.
Fig. 2 is a structural representation of measuring moment of friction under the hot vacuum environment.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
See figures.1.and.2; A kind of hot vacuum environment test moment value correction method, two coaxial both sides that are installed in vacuum tank of identical magnet fluid sealing axle, said two magnet fluid sealing axles are respectively installed a torque sensor; The first left-hand rotation square sensor is installed in a magnet fluid sealing axle left side; The first right torque sensor is installed on a magnet fluid sealing axle right side, and the said first left-hand rotation square sensor is positioned at outside the jar, and the said first right torque sensor is positioned at jar; The second left-hand rotation square sensor is installed in the left side of another root magnet fluid sealing axle, and the second right torque sensor is installed on another root magnet fluid sealing axle right side, and the said second left-hand rotation square sensor is positioned at jar, and the said second right torque sensor is positioned at outside the jar.
According to shown in Figure 1,1 is vacuum tank, 13 and 23 be about two magnet fluid sealing axles, be defined in the moment of friction N of hot vacuum environment lower shaft 13
a, the moment of friction of axle 23 is N
bOutside each magnet fluid sealing axle jar with in the jar moment of friction is arranged respectively, is defined as:
N
a＝N
a1+N
a2
N
b＝N
b1+N
b2
N
A1Be the moment of friction of the left side generation of axle 13, this moment of friction is operated under the normal temperature and pressure environment N outside jar
A2Moment of friction for axle 13 right sides produce is operated under the hot vacuum environment.N
B1Be the moment of friction of the right side generation of axle 23, this moment of friction is operated under the normal temperature and pressure environment N outside jar
B2Moment of friction for axle 23 left sides produce is operated under the hot vacuum environment.
The 1st step:
As shown in Figure 1, at first at normal temperatures and pressures, measure the total frictional force square of 13 and 23 two magnet fluid sealing axles respectively.Method of testing is for respectively installing a high precision torque sensor in magnet fluid sealing axle both sides; Wherein 13 be connected to 11 and 15 two torque sensors through 12 and 14 two flexible clutchs, 23 are connected to 21 and 25 two torque sensors through 22 and 24 two flexible clutchs.15 left sides connect driving mechanism, and 11 right sides connect load maintainer, the torque difference of testing 13 two sensors 11 and 15, and this numerical value is exactly magnet fluid sealing axle 13 moment of friction at normal temperatures and pressures, and measured value defined is N '
a25 right sides connect driving mechanism, and 21 left sides connect load maintainer, the torque difference of testing 23 two sensors 21 and 25, and this numerical value is exactly magnet fluid sealing axle 23 moment of friction at normal temperatures and pressures, is defined as N '
bWherein:
N′
a＝N
a1+N′
a2
N′
b＝N
b1+N′
b2
N '
A2The moment of friction that magnet fluid sealing axle right side produces is operated under the normal temperature and pressure environment;
N '
B2The moment of friction that the left side of another root magnet fluid sealing axle produces is operated under the normal temperature and pressure environment;
The 2nd step:
As shown in Figure 2; Process a special axis 2; Directly magnet fluid sealing axle 13 and 23 is coupled together through flexible clutch 12 and 22, respectively be connected a high precision torque sensor 15 and 25 two magnet fluid sealing axle jar exterior portions through flexible clutch 14 and 24, vacuum tank is operated in tested mechanism or the required hot vacuum environment of device to test; Torque sensor 15 sides are done driving; Torque sensor 25 is surveyed and is connect loading, writes down the torque difference of sensor 15 and 25, and this numerical value is the moment of friction value sum of magnet fluid sealing axle 13 and 23 under hot vacuum environment.This value is N
Ab:
N
ab＝N
a1+N
a2+N
b1+N
b2
The moment of friction value sum of two axles that the first step is measured is subtracted each other with the total frictional force square value that second pacing tries, and being defined as Δ N can obtain:
ΔN＝(N′
a+N′
b)-N
ab
＝(N
a1+N′
a2+N
b1+N′
b2)-(N
a1+N
a2+N
b1+N
b2)
＝(N′
a2-N
a2)+(N′
b2-N
b2)
＝ΔN
a+ΔN
b
This numeric representation be the moment total variations of two magnet fluid sealing axles under normal temperature and hot vacuum environment.Δ N wherein
aWith Δ N
bBe respectively magnet fluid sealing axle 13 and the moment variations amount of axle 23 under normal temperature and hot vacuum environment.Δ N value is very little on the one hand, to Δ N
aWith Δ N
bInfluence very for a short time, consider that on the other hand two magnet fluid sealing axle structures still are that working environment is all identical, therefore can think Δ N
a=Δ N
b=Δ N/2.Can obtain thus:
N
a＝N′
a+ΔN/2
N
b＝N′
b+ΔN/2
So far, N
aAnd N
bAll can obtain, can obtain the moment of friction value of each magnet fluid sealing axle under hot vacuum environment through test and data processing.
Further consider that the moment of friction of turning axle not is a constant along with torque and rotation speed change and change.Therefore above-mentioned test should be carried out under device being tested or equipment actual motion condition, tests under promptly identical with actual torque, the speed conditions prerequisite.Further consider again, can be with the data of testing under the different torque rotary speed conditions and curve to table look-up or the mode of function match obtains the moment of friction value under different operating modes.Carry out online or the off-line correction based on this numerical value to the resulting moment values of the outer test of vacuum tank, thereby obtain accurate torgue measurement value.
Claims (1)
1. hot vacuum environment test moment value correction method; It is characterized in that: two coaxial both sides that are installed in vacuum tank of identical magnet fluid sealing axle; A torque sensor is respectively installed in said two magnet fluid sealing axle both sides, and the first left-hand rotation square sensor is installed in a magnet fluid sealing axle left side, and the first right torque sensor is installed on a magnet fluid sealing axle right side; The said first left-hand rotation square sensor is positioned at outside the jar, and the said first right torque sensor is positioned at jar; The second left-hand rotation square sensor is installed in the left side of another root magnet fluid sealing axle, and the second right torque sensor is installed on another root magnet fluid sealing axle right side, and the said second left-hand rotation square sensor is positioned at jar, and the said second right torque sensor is positioned at outside the jar; Said moment value correction method may further comprise the steps:
(1), at normal temperatures and pressures, a magnet fluid sealing axle is connected with driving mechanism, and another root magnet fluid sealing axle is connected with load maintainer, measures the difference N ' of the first left-hand rotation square sensor and the first right torque sensor
a, another root magnet fluid sealing axle is connected with driving mechanism, and a magnet fluid sealing axle is connected with load maintainer, measures the difference N ' of the second right torque sensor and the second left-hand rotation square sensor once more
b, wherein:
N′
a＝N
a1+N′
a2
N′
b＝N
b1+N′
b2
In the following formula, N
A1Be the moment of friction of the left side generation of a magnet fluid sealing axle, this moment of friction is operated under the normal temperature and pressure environment outside jar; N '
A2Be the moment of friction that a magnet fluid sealing axle right side produces, be operated under the normal temperature and pressure environment; N
B1Be the moment of friction of the right side generation of another root magnet fluid sealing axle, this moment of friction is outside jar, and work at normal temperatures and pressures; N '
B2Be the moment of friction of the left side generation of another root magnet fluid sealing axle, be operated under the normal temperature and pressure environment;
(2), special axis of processing; The two ends of special axis connect with a magnet fluid sealing axle and another root magnet fluid sealing axle respectively; A magnet fluid sealing axle is connected with driving mechanism; Another root magnet fluid sealing axle is connected with load maintainer, two magnet fluid sealing axle jar exterior portions two torque sensors is set, and measures the difference N of the outside torque sensor of two magnet fluid sealing axle jars
Ab:
N
ab＝N
a1+N
a2+N
b1+N
b2
N
A1Be the moment of friction of the left side generation of a magnet fluid sealing axle, this moment of friction is outside jar, and work at normal temperatures and pressures; N
A2Be the moment of friction that a magnet fluid sealing axle right side produces, be operated under the hot vacuum environment; N
B1Be the moment of friction of the right side generation of another root magnet fluid sealing axle, this moment of friction is outside jar, and work at normal temperatures and pressures; N
B2Moment of friction for the left side of another root magnet fluid sealing axle produces is operated under the hot vacuum environment;
(3), the moment of friction value sum of two axles of (1) pacing amount and the total frictional force square value of (2) pacing examination are subtracted each other, be defined as Δ N and obtain:
ΔN＝(N′
a+N′
b)-N
ab
＝(N
a1+N′
a2+N
b1+N′
b2)-(N
a1+N
a2+N
b1+N
b2)
＝(N′
a2-N
a2)+(N′
b2-N
b2)
＝ΔN
a+ΔN
b
Δ N representes the moment total variation of two magnet fluid sealing axles under normal temperature and pressure and hot vacuum environment; Set Δ N
a=Δ N
b=Δ N/2 obtains thus:
N
a＝N′
a+ΔN/2
N
b＝N′
b+ΔN/2
Obtain N
aAnd N
bBe the moment of friction values of two magnet fluid sealing axles under hot vacuum environment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100397272A CN101788354B (en) | 2010-01-11 | 2010-01-11 | Hot vacuum environment test moment value correction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100397272A CN101788354B (en) | 2010-01-11 | 2010-01-11 | Hot vacuum environment test moment value correction method |
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|---|---|
| CN101788354A CN101788354A (en) | 2010-07-28 |
| CN101788354B true CN101788354B (en) | 2012-02-22 |
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|---|---|---|---|
| CN2010100397272A Active CN101788354B (en) | 2010-01-11 | 2010-01-11 | Hot vacuum environment test moment value correction method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487316B (en) * | 2013-09-18 | 2015-10-28 | 浙江工业大学 | Armature-moment-testing device under a kind of hot vacuum environment |
| CN103512691B (en) * | 2013-09-18 | 2015-05-27 | 浙江工业大学 | High-accuracy torque testing component in thermal vacuum environment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6532833B1 (en) * | 1998-12-07 | 2003-03-18 | Ryszard Marian Lec | Torque measuring piezoelectric device and method |
| CN1987387A (en) * | 2006-12-14 | 2007-06-27 | 浙江工业大学 | Two-way torque detector |
| CN101055037A (en) * | 2007-04-29 | 2007-10-17 | 浙江工业大学 | Magnetofluid seal driving device for vacuum equipment driving shaft |
| CN101415976A (en) * | 2006-03-31 | 2009-04-22 | 伊格尔工业股份有限公司 | Device for sealing magnetic fluid |
-
2010
- 2010-01-11 CN CN2010100397272A patent/CN101788354B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6532833B1 (en) * | 1998-12-07 | 2003-03-18 | Ryszard Marian Lec | Torque measuring piezoelectric device and method |
| CN101415976A (en) * | 2006-03-31 | 2009-04-22 | 伊格尔工业股份有限公司 | Device for sealing magnetic fluid |
| CN1987387A (en) * | 2006-12-14 | 2007-06-27 | 浙江工业大学 | Two-way torque detector |
| CN101055037A (en) * | 2007-04-29 | 2007-10-17 | 浙江工业大学 | Magnetofluid seal driving device for vacuum equipment driving shaft |
Non-Patent Citations (1)
| Title |
|---|
| 王玲，黄克威等.固体润滑轴承真空寿命实验及分析.《真空与低温》.1992,第11卷(第1期),7-9. * |
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| CN101788354A (en) | 2010-07-28 |
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Effective date of registration: 20201221 Address after: No.99 Tianjin Road, Rizhao Economic Development Zone, Shandong Province Patentee after: Rizhao Economic and Technological Development Zone Urban Development Investment Group Co.,Ltd. Address before: N793, 3 / F, Xingguang Yingjing, 117 Shuiyin Road, Yuexiu District, Guangzhou City, Guangdong Province 510030 Patentee before: Guangzhou haokezhi Technology Development Co.,Ltd. Effective date of registration: 20201221 Address after: N793, 3 / F, Xingguang Yingjing, 117 Shuiyin Road, Yuexiu District, Guangzhou City, Guangdong Province 510030 Patentee after: Guangzhou haokezhi Technology Development Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310014 City Zhaohui District Six Patentee before: ZHEJIANG University OF TECHNOLOGY |
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