CN108663172A - Method for measuring seal leakage rate - Google Patents
Method for measuring seal leakage rate Download PDFInfo
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- CN108663172A CN108663172A CN201810447672.5A CN201810447672A CN108663172A CN 108663172 A CN108663172 A CN 108663172A CN 201810447672 A CN201810447672 A CN 201810447672A CN 108663172 A CN108663172 A CN 108663172A
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- chamber
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- leakage rate
- seal leakage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to the methods for measuring seal leakage rate.This method includes：Sealing element is loaded in the two-chamber measuring device including the first chamber and the second chamber, the first chamber and the second chamber are separated by sealing element；First chamber pressurize or depressurize the second chamber, so that the air pressure of the first intracavitary is more than the air pressure of the second intracavitary；The air pressure p for measuring the first chamber is inscribed at firstA0With the air pressure p of the second chamberB0, the air pressure p for measuring the first chamber is inscribed at secondA1With the air pressure p of the second chamberB1；By pA0、pA1、pB0、pB1The P of following formula is substituted into respectivelyA、PBIn, to which the slip of sealing element be calculated, wherein the slip of sealing element coefficient of permeability K and inertia infiltration coefficient β are characterized,Wherein, M is the molal weight of gas, L be gas by distance, R is gas constant, and T is the temperature of gas, and μ is the coefficient of kinematic viscosity of gas, mqIt is the mass flow of gas.The present invention can play following advantageous effects：It can high-acruracy survey seal leakage rate.
Description
Technical field
The present invention relates to technical field of function test, the method for more particularly, to measuring seal leakage rate.
Background technology
Modern aircraft main cabin is usually to be pressurized, and the air-tightness of anallobar hatch door directly influences passenger and crew
Safety, especially in aerospace field, sealing part works bad environments, therefore it proposes the leakage performance of sealing element
Very high requirement, it is necessary to study its air-tightness in different compression ratios (operating mode).
Traditional measurement method is simulation closed cavity, and the leakage of practical sealing element is tested by introducing the method for flowmeter
Amount, but because flow is smaller, is difficult to obtain accurately data by meter measurement merely, can only be averaged by the long period
Value method obtains approximation, it is difficult to meet high-precision test requirements document.
In addition, high aerial cabin external pressure is less than a standard atmospheric pressure, single-chamber measures slip itself cannot be accurate
Simulation truth is got off the plane the working condition of sealing element.
Invention content
It is an object of the present invention to overcome the defects for the method for being currently used for measuring seal leakage rate, provide one
The new method for measuring seal leakage rate of kind, can high-acruracy survey seal leakage rate.
The object above of the present invention is realized by a kind of for measuring the method for seal leakage rate, described for measuring
The method of seal leakage rate includes：
The sealing element is loaded in two-chamber measuring device, wherein the two-chamber measuring device includes the first chamber and the
Two chambers, after loading on the sealing element in two-chamber measuring device, first chamber and second chamber are by the sealing
Part separates；
First chamber pressurize or depressurize second chamber, so that the air pressure of first intracavitary is big
In the air pressure of second intracavitary；
The air pressure p for measuring first chamber is inscribed at firstA0With the air pressure p of second chamberB0, inscribed at second
Measure the air pressure p of first chamberA1With the air pressure p of second chamberB1；
By pA0、pA1、pB0、pB1The P of following formula is substituted into respectivelyA、PBIn, to which the slip of the sealing element be calculated,
In, the slip coefficient of permeability K of the sealing element and inertia infiltration coefficient β are characterized,
Wherein, M is the molal weight of gas, L be gas by distance, R is gas constant, and T is the temperature of gas, μ
It is the coefficient of kinematic viscosity of gas, mqIt is the mass flow of gas.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：It can high-acruracy survey seal leakage rate.
It is preferred that the method for measuring seal leakage rate further includes：P is obtained in measurementA0、pA1、pB0、pB1
Later, judge whether measured value is credible.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：Insincere measured value can effectively be excluded, it is ensured that measure accurate credible.
It is preferred that judging whether measured value is credible and including：
Measure the volume V of first chamberAWith the volume V of second chamberB；
Obtain PA、PBRelation curve；
If measured value pA0、pA1、pB0、pB1Close to the relation curve, then judge that measured value is credible；
If measured value pA0、pA1、pB0、pB1Far from the relation curve, then judge that measured value is insincere.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：By above-mentioned reasonable manner, insincere measured value can be effectively excluded, it is ensured that measure accurate credible.
It is preferred that the volume V of first chamberAWith the volume V of second chamberBIt is measured by douche.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：The volume of the volume and the second chamber of the first chamber can accurately be obtained.
It is preferred that the relation curve is by by VA、VBFollowing formula is substituted into obtain：
VA·(pA1-pA0)+VB·(pB1-pB0)=0
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：P can accurately be obtainedA、PBRelation curve.
It is preferred that working as measured value pA0、pA1、pB0、pB1Difference on the relation curve between corresponding ideal value is small
When equal to 5%, it is believed that measured value pA0、pA1、pB0、pB1Close to the relation curve；As measured value pA0、pA1、pB0、pB1With institute
When stating the difference between the corresponding ideal value on relation curve more than 5%, it is believed that measured value pA0、pA1、pB0、pB1Far from the pass
It is curve.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：By above-mentioned reasonable manner, insincere measured value can be effectively excluded, it is ensured that measure accurate credible.
It is preferred that first moment is initial time.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：The air pressure of the first chamber and the second chamber can be measured for the first time at the time of suitable, it is ensured that high-acruracy survey seal leakage rate.
It is preferred that second moment is at least two hours after initial time.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：The air pressure of the first chamber and the second chamber can be measured again at the time of suitable, it is ensured that high-acruracy survey seal leakage rate.
Description of the drawings
Fig. 1 is the systematic schematic diagram for measuring seal leakage rate of one embodiment of the invention.
Fig. 2 is the system block diagram for measuring seal leakage rate of one embodiment of the invention.
Fig. 3 is the P in the method for measuring seal leakage rate of one embodiment of the inventionA、PBGraph of relation.
Reference numerals list
1, sealing element
11, the first chamber
12, the first chamber
Specific implementation mode
The specific implementation mode of the present invention explained below, it should be pointed out that in the specific descriptions of these embodiments
In the process, in order to carry out brief and concise description, this specification can not possibly make in detail all features of actual embodiment
Most description.It is to be understood that during the actual implementation of any one embodiment, as in any one work
During journey project or design object, in order to realize the objectives of developer, in order to meet, system is relevant or quotient
The relevant limitation of industry can usually make various specific decisions, and this can also be implemented from a kind of embodiment to another kind
It changes between mode.Moreover, it is to be understood that although effort made in this development process may be complicated
And it is interminable, however for for the relevant those skilled in the art of present disclosure, in the disclosure
The changes such as some designs, manufacture or the production that are carried out on the basis of the technology contents of exposure are conventional technology, no
It should be understood as that content of this disclosure is insufficient.
Unless otherwise defined, the technical term or scientific terminology used in claims and specification should be this hair
The ordinary meaning that the personage with general technical ability is understood in bright technical field.Present patent application specification and power
" first ", " second " and the similar word used in sharp claim is not offered as any sequence, quantity or importance, and
It is used only to distinguish different component parts.The similar word such as "one" or " one " is not offered as quantity limitation, but indicates
There are at least one.Either the similar word such as "comprising" means to appear in the element before " comprising " or "comprising" " comprising "
Either object covers the element for appearing in " comprising " or "comprising" presented hereinafter or object and its equivalent element, it is not excluded that
Other elements or object." connection " either the similar word such as " connected " is not limited to physics or mechanical connection,
It is also not necessarily limited to direct or indirect connection.
Fig. 1 is the systematic schematic diagram for measuring seal leakage rate of one embodiment of the invention.Fig. 2 is that the present invention one is real
Apply the system block diagram for measuring seal leakage rate of example.Fig. 3 is one embodiment of the invention for measuring seal leakage
P in the method for rateA、PBGraph of relation.
As shown in Figs. 1-3, the method for measuring seal leakage rate of one embodiment of the invention includes：
Sealing element 1 is loaded in two-chamber measuring device, wherein two-chamber measuring device includes the first chamber 11 and the second chamber
12, after loading on sealing element 1 in two-chamber measuring device, the first chamber 11 and the second chamber 12 are separated by sealing element 1；
First chamber 11 pressurize or depressurize the second chamber 12, so that the air pressure in the first chamber 11 is more than second
Air pressure in chamber 12；
The air pressure p for measuring the first chamber is inscribed at firstA0With the air pressure p of the second chamberB0, measurement first is inscribed at second
The air pressure p of chamberA1With the air pressure p of the second chamberB1；
By pA0、pA1、pB0、pB1The P of following formula is substituted into respectivelyA、PBIn, to which the slip of sealing element be calculated, wherein
The slip of sealing element coefficient of permeability K and inertia infiltration coefficient β are characterized,
Wherein, M is the molal weight of gas, L be gas by distance, R is gas constant, and T is the temperature of gas, μ
It is the coefficient of kinematic viscosity of gas, mqIt is the mass flow of gas.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：It can high-acruracy survey seal leakage rate.
The foregoing describe to the first chamber pressurize or depressurize the second chamber, certainly, those skilled in the art are at this
It is appreciated that also to the first chamber can pressurize and depressurize the second chamber simultaneously on the basis of application disclosure, without
It is detached from the application scope of the claims.
It is preferred that experimental box (two-chamber measuring device) is pressurizeed and depressurized with air pressure pump and vacuum pump, shape
At the cavity (the first chamber 11 and the second chamber 12) of two different pressure.Then, computer carries out intracavitary air pressure by control valve
Control makes it keep substantially constant (moment is alternatively referred to as " initial time ").Pressure gauge can be in two cavitys of real-time display
Pressure.By closing valve (control valve and check valve) so that two-chamber measuring device does not carry out gas exchanges with the external world, measures
The variation of pressure gauge is (that is, inscribe the air pressure p for measuring the first chamber at firstA0With the air pressure p of the second chamberB0, inscribed at second
Measure the air pressure p of the first chamberA1With the air pressure p of the second chamberB1), seal leakage rate is calculated by above formula.
It is preferred that the method for measuring seal leakage rate further includes：P is obtained in measurementA0、pA1、pB0、pB1Later,
Judge whether measured value is credible.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：Insincere measured value can effectively be excluded, it is ensured that measure accurate credible.
It is preferred that judging whether measured value is credible and including：
Measure the volume V of the first chamberAWith the volume V of the second chamberB；
Obtain PA、PBRelation curve (as shown in Figure 3)；
If measured value pA0、pA1、pB0、pB1Proximity relation curve then judges that measured value is credible；
If measured value pA0、pA1、pB0、pB1Far from relation curve, then judge that measured value is insincere.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：By above-mentioned reasonable manner, insincere measured value can be effectively excluded, it is ensured that measure accurate credible.
It is preferred that the volume V of the first chamberAWith the volume V of the second chamberBIt is measured by douche.
Specifically, special load plate is made, trepanning on plate.After being sealed using method identical with ordinary load plate,
The water filling simultaneously into two cavitys by the hole in load plate, and keep water level in two cavitys close.Until filling, injection two is calculated
Water in cavity can be obtained the volume of cavity.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：The volume of the volume and the second chamber of the first chamber can accurately be obtained.
It is preferred that relation curve is by by VA、VBFollowing formula is substituted into obtain：
VA·(pA1-pA0)+VB·(pB1-pB0)=0
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：P can accurately be obtainedA、PBRelation curve.
Obtain PA、PBThe specific theory deduction process of relation curve is as follows：
The Ideal-Gas Equation is pV=nRT.
If high pressure chest is A chambers, volume and pressure are respectively VA、pA, low pressure chamber is B chambers, volume VB, pB。
B chambers are taken to illustrate.For the gas of B chambers, just there is pBVB=nBRT, toGas in B chambers
Quality be mB=MnB.Wherein, M is that the molal weight of air takes M=29g/mol=0.029kg/mol here.
The gaseous mass (mass leakage amount) flowed out from B chambers in unit interval：
A chambers can be calculated with same method.
It needs to carry out differential to B cavity pressures in above formula, but the pressure curve of B chambers is centrifugal pump in practice, this is can to use
Curve matching acquires approximated slope using the method for difference.
For theoretically, if ensureing that two cavitys of A, B and the external world are absolutely sealed, the gas flowed out from A should be complete
B chambers are flowed to.
I.e.：QA=-QB(2)
Sign is because the gaseous mass in A chambers is in reduction, and is increased in B chambers.Bring (2) formula into, and
It is integrated, is then had from 0~t moment：
Volume varies less during the test, ignores.It again assumes that temperature change is little in test process, can also neglect
Slightly.
Wherein, pA0、pB0The respectively air pressure of A chambers and B chamber initial times, pA1、pB1It is the air pressure of measurement time respectively.
It is assumed that TA=TB, then obtain：
VA·(pA1-pA0)+VB·(pB1-pB0)=0 (5)
By VA、VBSubstitute into above formula (5), so that it may obtain PA、PBRelation curve, as shown in Figure 3.
It is preferred that working as measured value pA0、pA1、pB0、pB1Difference between ideal value corresponding on relation curve is less than etc.
When 5%, it is believed that measured value pA0、pA1、pB0、pB1Proximity relation curve；As measured value pA0、pA1、pB0、pB1With on relation curve
Corresponding ideal value between difference be more than 5% when, it is believed that measured value pA0、pA1、pB0、pB1Far from relation curve.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：By above-mentioned reasonable manner, insincere measured value can be effectively excluded, it is ensured that measure accurate credible.
It is preferred that the first moment was initial time.That is, to the first chamber pressurize or subtract the second chamber
After pressure, two chamber air pressures have been at the time of just kept substantially constant.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：The air pressure of the first chamber and the second chamber can be measured for the first time at the time of suitable, it is ensured that high-acruracy survey seal leakage rate.
It is preferred that the second moment was at least two hours after initial time.
According to above-mentioned technical proposal, the method for measuring seal leakage rate of the invention can play following Advantageous
Effect：The air pressure of the first chamber and the second chamber can be measured again at the time of suitable, it is ensured that high-acruracy survey seal leakage rate.
Some exemplary embodiments are described above.It should be understood, however, that various modifications may be made.Example
Such as, if described technology is executed in different order and/or if in described system, framework, equipment or circuit
Component is combined and/or substituted or supplemented by other component or its equivalent in different ways, then may be implemented suitably to tie
Fruit.Correspondingly, other embodiment is also fallen into scope of the claims.
Claims (8)
1. a kind of method for measuring seal leakage rate, which is characterized in that the side for measuring seal leakage rate
Method includes：
The sealing element is loaded in two-chamber measuring device, wherein the two-chamber measuring device includes the first chamber and the second chamber,
After loading on the sealing element in two-chamber measuring device, first chamber and second chamber are by the sealing element point
Every；
First chamber pressurize or depressurize second chamber, so that the air pressure of first intracavitary is more than institute
State the air pressure of the second intracavitary；
The air pressure p for measuring first chamber is inscribed at firstA0With the air pressure p of second chamberB0, inscribed at second and measure institute
State the air pressure p of the first chamberA1With the air pressure p of second chamberB1；
By pA0、pA1、pB0、pB1The P of following formula is substituted into respectivelyA、PBIn, to which the slip of the sealing element be calculated, wherein institute
Slip coefficient of permeability K and the inertia infiltration coefficient β of sealing element are stated to characterize,
Wherein, M is the molal weight of gas, L be gas by distance, R is gas constant, and T is the temperature of gas, and μ is gas
The coefficient of kinematic viscosity of body, mqIt is the mass flow of gas.
2. the method as described in claim 1 for measuring seal leakage rate, which is characterized in that described for measuring sealing
The method of part slip further includes：P is obtained in measurementA0、pA1、pB0、pB1Later, judge whether measured value is credible.
3. the method as claimed in claim 2 for measuring seal leakage rate, which is characterized in that judge that measured value whether may be used
Letter includes：
Measure the volume V of first chamberAWith the volume V of second chamberB；
Obtain PA、PBRelation curve；
If measured value pA0、pA1、pB0、pB1Close to the relation curve, then judge that measured value is credible；
If measured value pA0、pA1、pB0、pB1Far from the relation curve, then judge that measured value is insincere.
4. the method as claimed in claim 3 for measuring seal leakage rate, which is characterized in that the volume of first chamber
VAWith the volume V of second chamberBIt is measured by douche.
5. the method as claimed in claim 3 for measuring seal leakage rate, which is characterized in that the relation curve passes through
By VA、VBFollowing formula is substituted into obtain：
VA·(pA1-pA0)+VB·(pB1-pB0)=0
6. the method as claimed in claim 3 for measuring seal leakage rate, which is characterized in that as measured value pA0、pA1、
pB0、pB1When difference between ideal value corresponding on the relation curve is less than or equal to 5%, it is believed that measured value pA0、pA1、
pB0、pB1Close to the relation curve；As measured value pA0、pA1、pB0、pB1Between ideal value corresponding on the relation curve
When difference is more than 5%, it is believed that measured value pA0、pA1、pB0、pB1Far from the relation curve.
7. the method as described in claim 1 for measuring seal leakage rate, which is characterized in that first moment is just
Begin the moment.
8. the method as claimed in claim 7 for measuring seal leakage rate, which is characterized in that second moment is just
At least two hours after moment beginning.
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| CN201810447672.5A CN108663172B (en) | 2018-05-11 | 2018-05-11 | Method for measuring the leakage rate of a seal |
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| CN201810447672.5A CN108663172B (en) | 2018-05-11 | 2018-05-11 | Method for measuring the leakage rate of a seal |
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| CN108663172B CN108663172B (en) | 2020-02-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816141A (en) * | 2021-01-06 | 2021-05-18 | 广州橙行智动汽车科技有限公司 | Air tightness detection device and air tightness detection method thereof |
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