CN100533090C - Leakage detection method for closed container - Google Patents
Leakage detection method for closed container Download PDFInfo
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- CN100533090C CN100533090C CNB2006100397280A CN200610039728A CN100533090C CN 100533090 C CN100533090 C CN 100533090C CN B2006100397280 A CNB2006100397280 A CN B2006100397280A CN 200610039728 A CN200610039728 A CN 200610039728A CN 100533090 C CN100533090 C CN 100533090C
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Abstract
This invention relates to a leakage detection method for closed container, wherein, arranging sensors for temperature and moisture, filling gas or vacuumizing to seal and collect the container temperature value t within -25Deg~80Deg and corresponding moisture value h(t) for the creation of fitting curve equation h(t)= nsigmat=0 ait'; by the temperature value t and moisture value h(t) calculating the ai as fitting curve parameter value; writing the curve equation into the memory; using sensors to gather real values and fitting equation to calculate the theoretic values; when the relative humidity error more than 10%, alarming. This invention can foresee sensor variation accurately to ensure the device reliability and application in different fields.
Description
Technical field
The present invention relates to the leakage detection method of a kind of leakage detection method of container, particularly a kind of closed container.
Background technology
In fields such as industry, chemical industry, to some key equipments of the online detection of needs, normally install sensor at the check point place, by sensor detected relevant signal is reached the outside and compare, analyze.But the sensor that is installed in the check point place is the device with section processes circuit and sense signal to be sealed in the case, with the accuracy of guaranteeing to measure.But after the case breakage of sensor, normally have no idea to learn, and the breakage of case can cause the sensor measurement precision inaccurate.In addition, after artificially making amendment, with after the sealing of sensor case, just can reach the purpose of cheating again to the sensor treatment circuit and to the device of sense signal.
Summary of the invention
The leakage detection method that the purpose of this invention is to provide a kind of closed container, utilization is arranged on the temperature value and the humidity value of the sensor output in the airtight container, the temperature humidity graph equation of setting up by the temperature value that dispatches from the factory and humidity value, calculate theoretical humidity value, and with the actual measurement humidity value compare, predict sensor exactly and whether change, thus the functional reliability of raising equipment.
The present invention is that the technical scheme that achieves the above object is: a kind of leakage detection method of closed container is characterized in that:
(1), at first mounting temperature sensor and humidity sensor in container, container charges into gas or sealed after being vacuumized, gathers the humidity value h (t) of the closed container temperature value t at least three or more and correspondence between-25 ℃～80 ℃;
(2), in microprocessor, set up the temperature variant matched curve equation of relative humidity in the closed container
Wherein: the corresponding humidity value of h (t)-when being the collecting temperature value,
N-sampling number, n 〉=2,
a
i-be each rank parameter value of humiture matched curve,
Each temperature value of t-collection,
(3), the parameter value a that calculates the humiture matched curve by each the temperature value t that gathers and corresponding rh value h (t)
i, finish the temperature variant humiture matched curve of this closed container relative humidity equation, and write store;
(4), during the closed container operate as normal, gather actual temperature value t more than three by temperature sensor and humidity sensor
cWith corresponding humidity value h
c(t), and deliver in the microprocessor, go out corresponding theoretical rh value h (t) with humiture matched curve Equation for Calculating;
(5), the relative humidity deviation value under the calculating uniform temp
As relative humidity deviation value h
w(t), report to the police greater than 10% o'clock.
The present invention has set up the temperature variant matched curve equation of relative humidity to closed container, each temperature value and the rh value corresponding when dispatching from the factory with it by gathering airtight container, calculate each rank parameter value of the humiture matched curve when dispatching from the factory, finish the humiture matched curve equation of this closed container.Therefore can be by being arranged on temperature sensor and the humidity sensor in the airtight container, gather the humiture environmental physics of airtight container, go out theoretical rh value with this humiture matched curve Equation for Calculating, and compare with the rh value of actual acquisition, just can judge whether closed container is in air-tight state, in case variation has taken place in the closed container environment for use that is under the air-tight state, after not only closed container had leaked or had leaked but also sealed, the relative humidity deviation value of this closed container will exceed setting value, inform that leakage has taken place closed container, reflect that real-time and accurately whether the closed container physical environment changes, and can guarantee the functional reliability of equipment.Detection method of the present invention rapidly and efficiently can be widely used in the online leakproofness detection of industrial seal sensor, the anti-cheating detection of key equipment etc.
Description of drawings
Below in conjunction with accompanying drawing embodiments of the invention are described in further detail.
Fig. 1 is the process flow diagram that the present invention sets up humiture matched curve equation
Fig. 2 is humiture matched curve of the present invention.
Fig. 3 is the process flow diagram in the closed container work of the present invention.
Fig. 4 is the humiture curve comparison diagram among the embodiment 1.
Fig. 5 is the humiture curve comparison diagram among the embodiment 2.
Fig. 6 is the humiture curve comparison diagram among the embodiment 3.
Embodiment
The present invention is mounting temperature sensor and humidity sensor in container at first, container charge into gas or vacuumize the back under normal temperature environment 25 ℃ ± 5 ℃ carry out welded seal.This gas adopts the inert gas of helium or argon gas, also can adopt nitrogen or carbon dioxide and other gas.Closed container is placed in the incubator,, gathers closed container temperature value t more than at least three between-25 ℃～80 ℃ through after the thermal equilibrium
iRh value h (t) with correspondence.In microprocessor, set up the temperature variant matched curve equation of relative humidity in the closed container
Wherein: h (the t)-rh value of correspondence when being collecting temperature, n-sampling number, n 〉=2, a
i-be each rank parameter value of humiture matched curve, t-collection point temperature value.See process flow diagram shown in Figure 1, the temperature variant matched curve equation of relative humidity in the closed container is set up in the beginning back in microprocessor, it gathers the temperature value t and the corresponding rh value h (t) of each point when the test macro order, microprocessor receives after the order image data and deposits in the storer, and each temperature value t and corresponding rh value h (t) calculate the parameter value a of humiture matched curve in storer
i, finish the temperature variant humiture matched curve of this closed container relative humidity, write microprocessor.See the humiture matched curve of finishing that is shown in Figure 2.
After the closed container operate as normal, see process flow diagram shown in Figure 3, read the humiture matched curve equation in the storer, the actual temperature value t more than three by temperature sensor and humidity sensor collection
cWith corresponding rh value h
c(t), go out corresponding theoretical humidity value h (t) with humiture matched curve Equation for Calculating.Calculate the relative humidity deviation value under the uniform temp
As relative humidity deviation value h
W(t), report to the police greater than 10% o'clock.
The above-mentioned sampling number n that finishes the temperature variant humiture matched curve of this closed container relative humidity and in sampling process, during the closed container operate as normal, gathers an actual temperature value t every 5～15min between 2～6
cHumidity value h with correspondence
c(t).
Embodiment 1
Closed container of the present invention is the digital LOAD CELLS of a welded seal, comprises temperature sensor, humidity sensor, microprocessor and storer in the wherein built-in circuit board.Before the LOAD CELLS body seal, deflate, charge into helium, under normal temperature environment, carry out welded seal then.After the sealing, LOAD CELLS is placed in the incubator, environment temperature is placed 25 ℃ respectively ,-10 ℃ and 40 ℃, through after the thermal equilibrium, it gathers the temperature value t and the rh value h (t) of each point the test macro order, and this LOAD CELLS is at-10 ℃, 20 ℃, the rh value that records under 40 ℃ is respectively: 61.6,36.5,23 (unit: %RH), with humiture matched curve equation
Set up the humiture matched curve, when n=2, use the conic fitting method, can obtain the system of equations that following three equations are formed:
61.6＝a
2×(273-10)
2+a
1×(273-10)+a
0
36.5＝a
2×(273+20)
2+a
1×(273+20)+a
0
23＝a
2×(273+40)
2+a
1×(273+40)+a
0
Solve: a
2=0.00323333; a
1=-2.6344; a
0=530.8;
The temperature variant matched curve equation of relative humidity is in this closed container:
h(t)＝-0.00323333t
2-2.6344t+530.8
Down, survey one group-10 ℃ in working order, 20 ℃, 40 ℃ temperature value and corresponding humidity value 61.9,36.1,23.2 are with the actual temperature value t that gathers
cThe humiture matched curve equation that substitution is above-mentioned calculates theoretical humidity value h (t), calculates the relative humidity deviation value again.See table 1 for details.
Table 1
| Sequence number (collection point) | 1 | 2 | 3 |
| Observed temperature value t when dispatching from the factory (℃) | -10 | 20 | 40 |
| Kelvin rating | 263 | 293 | 314 |
| Actual measurement humidity value h (t) (%RH) when dispatching from the factory | 61.6 | 36.5 | 23 |
| Observed temperature value t during work c(℃) | -10 | 20 | 40 |
| Actual measurement humidity value h during work c(t)(％RH) | 61.9 | 36.1 | 23.2 |
| Theoretical humidity value h (t) (%RH) | 61.6 | 36.5 | 23 |
| Relative humidity deviation value h W(t)(％) | 0.48 | 1.12 | 0.86 |
As can be seen from Figure 4, three curves among the figure are respectively: humiture quadratic fit curve; When dispatching from the factory, record the quafric curve of data according to three collection points of closed container; The temperature variant curve of the relative humidity of closed container actual measurement.Obviously, the humiture curve of the humiture curve of closed container when dispatching from the factory is consistent during work, can think good with this closed container airtight performance.
Embodiment 2
Closed container of the present invention is the anti-explosion safety grid of a rubber seal, comprises temperature sensor, humidity sensor, microprocessor and storer in the wherein built-in circuit board.Before anti-explosion safety grid sealings, deflate, charge in the nitrogen and vacuumize, under normal temperature environment, carry out rubber seal then.After the sealing, the anti-explosion safety grid are placed in the incubator, environment temperature are placed-10 ℃ respectively, 0 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃, through after the thermal equilibrium, it gathers the temperature value t and the rh value h (t) of each point the test macro order, and these anti-explosion safety grid are at-10 ℃, 0 ℃, 10 ℃, 20 ℃, 30 ℃, the humidity value h (t) that records under 40 ℃ is respectively: 63.3,56.1,48.5,35.8,28.7,22.2 (unit: %RH), with humiture matched curve equation
Set up the humiture matched curve, when n=5, use the quintic curve fitting process, can obtain the system of equations that following six equations are formed:
63.3＝a
5×(273-10)
5+a
4×(273-10)
4+a
3×(273-10)
3+a
2×(273-10)
2+a
1×(273-10)+a
0
56.1＝a
5×(273)
5+a
4×(273)
4+a
3×(273)
3+a
2×(273)
2+a
1×(273)+a
0
48.5＝a
5×(273+10)
5+a
4×(273+10)
4+a
3×(273+10)
3+a
2×(273+10)
2+a
1×(273+10)+a
0
35.8＝a
5×(273+20)
5+a
4×(273+20)
4+a
3×(273+20)
3+a
2×(273+20)
2+a
1×(273+20)+a
0
28.7＝a
5×(273+30)
5+a
4×(273+30)
4+a
3×(273+30)
3+a
2×(273+30)
2+a
1×(273+30)+a
0
22.2＝a
5×(273+40)
5+a
4×(273+40)
4+a
3×(273+40)
3+a
2×(273+40)
2+a
1×(273+40)+a
0
Solve: a
5=-0.00000259166666631561; a
4=0.00373137499949296;
a
3＝-2.14648074970736； a
2＝616.683782165637；
a
1＝-88486.984973311； a
0＝5073177.75358589
The temperature variant standard fit curvilinear equation of relative humidity is in this closed container:
h(t)＝-0.00000259166666631561t
5+0.00373137499949296t
4-2.14648074970736t
3
+616.683782165637t
2-88486.984973311t+5073177.75358589
Down, survey one group of temperature value t in working order
cAnd corresponding humidity value h
c(t), with the actual temperature value t that gathers
cThe humiture matched curve equation that substitution is above-mentioned calculates theoretical humidity value h (t) and relative humidity deviation value h
W(t).See table 2 for details.
Table 2
| Sequence number (collection point) | 1 | 2 | 3 | 4 | 5 | 6 |
| Temperature value t when dispatching from the factory (℃) | -10 | 0 | 10 | 20 | 30 | 40 |
| Kelvin rating | 263 | 273 | 283 | 293 | 303 | 313 |
| Actual measurement humidity value h (t) (%RH) when dispatching from the factory | 63.3 | 56.1 | 48.5 | 35.8 | 28.7 | 22.2 |
| Observed temperature value t during work c(℃) | -8 | 1 | 13 | 26 | 32 | 39 |
| Actual measurement rh value h during work c(t) | 68.1 | 73.5 | 56.8 | 43.6 | 36.5 | 28.7 |
| Theoretical humidity value h (t) | 60.4 | 55.7 | 44.8 | 30.5 | 28.1 | 23.8 |
| Relative humidity deviation value h W(t)％ | 12.75 | 31.95 | 26.79 | 42.95 | 29.89 | 20.59 |
As can be seen from Figure 5, three curves among the figure are respectively: the temperature variant curve of the relative humidity of closed container actual measurement.Airtight container records the humiture curve of five matches of data when dispatching from the factory according to six collection points; The temperature variant curve of the relative humidity of actual measurement during work.Obviously, the humiture curve of the humiture curve that can observe closed container when obtaining work when dispatching from the factory has very big-difference, judges that according to this leakage has taken place closed container.
Embodiment 3
Container of the present invention is the sensor terminal box of a rubber seal, comprises temperature sensor, humidity sensor, microprocessor and storer in the wherein built-in circuit board.Before the terminal box sealing, deflate, charge into argon gas or carbon dioxide, under normal temperature environment, carry out the glue envelope then.After the sealing, terminal box is placed in the incubator, environment temperature is placed-10 ℃ respectively, 10 ℃, 30 ℃, 40 ℃, through after the thermal equilibrium, it gathers the temperature value t and the rh value h (t) of each point the test macro order, and this terminal box is at-10 ℃, 10 ℃, 30 ℃, the humidity value that records under 40 ℃ is respectively: 62.3,48.9,20.1 23.7 (%RH) are with humiture matched curve equation
Set up the humiture matched curve, work as n=3, use the cubic curve fitting process, can obtain the system of equations that following four equations are formed:
62.3＝a
3×(273-10)
3+a
2×(273-10)
2+a
1×(273-10)+a
0
48.9＝a
3×(273+10)
3+a
2×(273+10)
2+a
1×(273+10)+a
0
30.1＝a
3×(273+30)
3+a
2×(273+30)
2+a
1×(273+30)+a
0
23.7＝a
3×(273+40)
3+a
2×(273+40)
2+a
1×(273+40)+a
0
Solve: a
5=-0.00000259166666631561; a
4=0.00373137499949296;
a
3＝0.000335；a
2＝-0.291165；a
1＝83.370945；a
0＝-7818.801395
The temperature variant matched curve equation of relative humidity is in this closed container:
h(t)＝0.000335t
3-0.291165t
2+83.370945t-7818.801395
In working order down, respectively at closed container two groups of temperature value t of actual measurement under perforate and the perforate state not
cAnd corresponding humidity value h
c(t), with the actual temperature value t that gathers
cThe humiture matched curve equation that substitution is above-mentioned calculates theoretical humidity value h (t) and relative humidity deviation value h
W(t), see table 3 for details.
Table 3
| Sequence number (collection point) | 1 | 2 | 3 | 4 |
| Temperature value t when dispatching from the factory (℃) | -10 | 10 | 30 | 40 |
| Kelvin rating | 263 | 283 | 303 | 313 |
| Actual measurement humidity value h (t) (%RH) when dispatching from the factory | 62.3 | 48.9 | 30.1 | 23.7 |
| Observed temperature value t during work c(℃) | -10 | 10 | 30 | 40 |
| Theoretical humidity value h (t) (℃) | 62.3 | 48.9 | 30.1 | 23.7 |
| Humidity value h is not surveyed in punching work c(t)(％RH) | 62.5 | 48.7 | 30.0 | 23.8 |
| The relative humidity deviation value of not punching h W(t)％ | 0.32 | 0.40 | 0.33 | 0.42 |
| Punching back work actual measurement humidity value h c(t)(％RH) | 68.1 | 56.1 | 40.4 | 58.3 |
| Punching back relative humidity deviation value h W(t)％ | 9.31 | 12.8 | 34.2 | 145.99 |
As can be seen from Figure 6, four curves among the figure are respectively: the temperature variant curve of the relative humidity of closed container actual measurement when dispatching from the factory; Record the cubic fit curve of data when dispatching from the factory according to four collection points in the closed container; The temperature variant curve of the relative humidity of actual measurement under the duty when not punching; After making a call to an aperture on the closed container, the temperature variant curve of the relative humidity of actual measurement under its duty.Obviously, the humiture curve and the matched curve that measure in the closed container under the duty when not punching are very approaching, and the humiture curve and the matched curve that measure in the closed container under the duty of punching back have very big-difference.This shows, humiture curve that measures during with work and matched curve contrast, its difference can be used for judging whether closed container is revealed.
Claims (5)
1, a kind of leakage detection method of closed container is characterized in that:
(1), at first mounting temperature sensor and humidity sensor in container, container charges into gas or sealed after being vacuumized, gathers closed container the temperature value t more than at least three and corresponding rh value h (t) between-10 ℃～40 ℃;
(2), in microprocessor, set up the temperature variant matched curve equation of relative humidity in the closed container
Wherein: h (the t)-rh value of correspondence when being the collecting temperature value,
N-sampling number, n 〉=2,
a
i-be each rank parameter value of humiture matched curve,
Each temperature value of t-collection,
(3), each rank parameter value a that calculates the humiture matched curve by each the temperature value t that gathers and corresponding rh value h (t)
i, finish the temperature variant humiture matched curve of this closed container relative humidity equation, and write store;
(4), during the closed container operate as normal, three above actual temperature value t that gather by temperature sensor and humidity sensor
cRh value h with correspondence
c(t), deliver in the microprocessor, go out corresponding theoretical rh value h (t) with humiture matched curve Equation for Calculating;
(5), the relative humidity deviation value under the calculating uniform temp
As relative humidity deviation value h
w(t), report to the police greater than 10% o'clock.
2, the leakage detection method of closed container according to claim 1 is characterized in that: described sampling number n is between 2～6.
3, the leakage detection method of closed container according to claim 1 is characterized in that: described gas is the inert gas of helium or argon gas.
4, the leakage detection method of closed container according to claim 1 is characterized in that: described gas is nitrogen or carbon dioxide.
5, the leakage detection method of closed container according to claim 1 is characterized in that: gather actual temperature value and corresponding rh value every 5～15min during the closed container operate as normal.
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| US7788968B2 (en) * | 2007-02-22 | 2010-09-07 | Grainpro, Inc. | System and method for self-verification of safe storage within hermetically sealed containers |
| CN102042899B (en) * | 2009-10-21 | 2014-11-12 | 浙江华仪电器科技有限公司 | Device and method for detecting gas leakage of sulfur hexafluoride high pressure vacuum switch |
| KR101933225B1 (en) * | 2010-01-14 | 2018-12-27 | 엔테그리스, 아이엔씨. | Ventilation gas management systems and processes |
| CN102410908B (en) * | 2011-08-04 | 2014-03-26 | 北京市华云分析仪器研究所有限公司 | Monitoring system of carbon dioxide geologic sequestration leakage |
| JP5661834B2 (en) * | 2013-03-05 | 2015-01-28 | ファナック株式会社 | Laser device capable of estimating the sealing property of a laser gas container |
| CN103868652B (en) * | 2014-03-18 | 2016-12-07 | 大唐移动通信设备有限公司 | A kind of RRU casing water inlet detection method and device |
| CN108061624B (en) * | 2017-11-21 | 2019-08-02 | 四川成发普睿玛机械工业制造有限责任公司 | The air mass flow and seal tightness test platform and test method of aerial motor spare part |
| CN108562406B (en) * | 2018-01-26 | 2019-09-13 | 山东岩马湖投资置业有限公司 | A kind of closed container leak detecting device peculiar to vessel |
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- 2006-04-07 CN CNB2006100397280A patent/CN100533090C/en active Active
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Address after: 213022 No. 111 West Taihu Road, Xinbei District, Jiangsu, Changzhou Co-patentee after: Mettler-Toledo (Changzhou) Precision Instruments Co., Ltd. Patentee after: Mettler-Toledo (Changzhou) Weighing Equipment System Co., Ltd. Co-patentee after: Mettler-Toledo (Changzhou) Measurement Technology Co., Ltd. Address before: 213001 Jiangsu Province, Changzhou City Changxi Road No. 111 Co-patentee before: Mettler-Toledo (Changzhou) Precision Instruments Co., Ltd. Patentee before: Mettler-Toledo (Changzhou) Weighing Equipment System Co., Ltd. Co-patentee before: Mettler-Toledo (Changzhou) Measurement Technology Co., Ltd. |
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Address after: 213125 No. 111 Taihu West Road, Xinbei District, Changzhou City, Jiangsu Province Co-patentee after: Mettler-Toledo (Changzhou) Measurement Technology Co., Ltd. Patentee after: Mettler-Toledo (Changzhou) Precision Instrument Co., Ltd. Co-patentee after: Mettler-Toledo (Changzhou) Weighing Equipment System Co., Ltd. Address before: 213022 No. 111 Taihu West Road, Xinbei District, Changzhou City, Jiangsu Province Co-patentee before: Mettler-Toledo (Changzhou) Precision Instruments Co., Ltd. Patentee before: Mettler-Toledo (Changzhou) Weighing Equipment System Co., Ltd. Co-patentee before: Mettler-Toledo (Changzhou) Measurement Technology Co., Ltd. |