CN1888843A - Checking meter and testing method for air-tight tester - Google Patents
Checking meter and testing method for air-tight tester Download PDFInfo
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- CN1888843A CN1888843A CN 200610054499 CN200610054499A CN1888843A CN 1888843 A CN1888843 A CN 1888843A CN 200610054499 CN200610054499 CN 200610054499 CN 200610054499 A CN200610054499 A CN 200610054499A CN 1888843 A CN1888843 A CN 1888843A
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- tightness test
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- 238000012360 testing method Methods 0.000 title claims description 67
- 238000012795 verification Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 11
- 238000012937 correction Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000003745 diagnosis Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000004887 air purification Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
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Abstract
A verification meter and the verification method of the aeroseal tester, the characteristic is: the inputting port of the aeroseal tester (-) connects with the manometer (-) by the air conduit, the manometer (-) connects with the barometric constant value valve (-) and the air-source package (-) in turn, the tee joint of the aeroseal tester outputting port connects with the two containers (-,-) , between the container (-) and the tee joint sets the gate valve (-) for controlling the air flux. The invention can not affect by the grey, water and the oil in the air, the verification result is trustiness and high accuracy.
Description
Technical field
The present invention be more particularly directed to a kind of method of calibration of tightness test device and be used to detect the tester of its sealing.
Background technology
Machinery manufacturing industry such as automobile are when the crankcase isometric(al) cavity type parts of processing engine, usually need to use Leak Off Test (LOT) machine testing workpiece leak condition, the Leak Off Test (LOT) machine has detection of electrons function (as close test instrument) mostly and visual inspection subsidiary function (immersion pick-up unit) guarantees accuracy and the reliability that workpiece sensing is leaked.Usually the tightness test device is by the high-precision test pressure transducer, and the CPU analysis circuit is with touch screen operation control system and user interface, formations such as single ended list pressure transmitter; Possess skills advanced person, high sensitivity, can repeat continuous detecting, easy to use and economical and practical characteristics.
The pressure loss characteristic that the tightness test device is controlled when work has been stored in the system, can be directly compare with detected workpiece, whether sensor and cpu system compensate correction fast, detected to determine before workpiece pressure complete stability to be checked to occur in its cavity leaking.
The tightness test device is applied in to detect to be produced in enormous quantities in the part, and along with the increase that detects number of times, its measuring accuracy, sensitivity decay thereupon, fault increases thereupon.Used the tightness test device of U.S. Uson Testra company and French ATEQ import as Chang'an company, when detecting to 800,000 times, main frame does not execute workpiece oil duct process of measurement, occurs the pressure P that should cover on the display interface of this instrument
0Curve interrupts suddenly, and the unexpected interrupt table of curve is understood loss of data, and fault has taken place in tightness test device system.At this moment, the bright warning of wrong pilot lamp on " ERR " and the airtight exerciser operation screen has appearred in Leak Detection machine PLC system, and leakage (leakage being arranged but can not survey workpiece with the immersion pick-up unit) is arranged in the cavity of demonstration workpiece.Need the tightness test device is carried out the failure cause diagnosis, repairs, debugs for this reason.
In the process of using and repairing preceding diagnosis, fault repair of tightness test device, need carry out verification to its exhaust process.Traditional method of calibration is to adopt standard correction device and tightness test device than the high extra fine grade of tightness test device to compare.The standard correction device is made up of standard leak head and standard component.The effect of standard leak head is equivalent to exemplar, is used for determining the accuracy and the stability of tightness test device, judges that can instrument correctly detect.It makes very accurate, because its dust in air, water, wet goods when verification influence very sensitivity to the leakage value of standard, therefore need be installed in constant temperature and humidity and the air room of fine quality and use, but also need periodic calibrating.And standard component is a leak free workpiece, its leakage value approximate zero, and per checkout equipment of higher extra fine grade that also need send in 3 years is demarcated (this equipment price is very expensive, about 1,000,000 to 5,000,000 yuan of the amount of money).Thereby the standard correction device is based on above-mentioned weak point, not only uses inconveniently, but also need spend expensive expense that it is demarcated.
Summary of the invention
The purpose of this invention is to provide a kind of tester that is used for the tightness test device, it is simple in structure easy to use, does not need to demarcate.
Another object of the present invention provides a kind of method of above-mentioned tester verification tightness test device, is not subjected to the influence of dust in air, water, wet goods factor during its verification, and check results is reliable, the accuracy height.
The object of the present invention is achieved like this:
The input port of described tightness test device is connected with tensimeter by gas piping, rain glass connects air pressure definite value valve and source of the gas bag successively, the output port threeway of tightness test device is connected with two containers, is provided with the gate valve that is used for the pilot-gas flow between one of them container and the threeway.
Method with checker verification tightness test device sealing property of the present invention may further comprise the steps:
(1) with air pressure definite value valve initial bleed pressure being set is 0.1Mpa, changes the set-point of detected pressures in verification subsequently;
(2) closing gate valve is opened the power supply of air pressure definite value valve, starts the tightness test device, and the container that is communicated with air pressure definite value valve is inflated, and when the maintenance pilot lamp of tightness test device is bright, opens gate valve;
(3) variation of volume in comparison two containers;
(4) gas of adjusting container repeatedly changes, and judges by the leakage rate of tester.
Owing to adopted such scheme, each pneumatic element and gas container all to adopt conventional equipment, be not subjected to condition restriction such as environment temperature, humidity and air purification degree, leakage, under state of nature, the tightness test device is carried out verification, check results is reliable, the accuracy height.When verification, whether flow and judge the impermeability of total system by measuring gas in two containers, therefore this verifier uses simple and direct, convenient, the energy quick diagnosis, help the maintenance personal to find out failure cause fast, in time fix a breakdown, the adjustment of tightness test device is returned to normal operating condition, can prolong the serviceable life of instrument.
Each pneumatic element in this verifier and gas container do not need to demarcate, and can save the demarcation check fee; Therefore can save the investments in fixed assets to millions of units up to a million.
This checker can be used for the correction of all tightness test devices, so the scope of application is wider, and also has advantage of simple structure.
Description of drawings
Fig. 1 is the structural representation of this tester;
Fig. 2 is the fundamental diagram of this tester;
Fig. 3 is the volume and the pressure linear graph of container 5;
Fig. 4 be container 5 ' volume and pressure linear graph.
Among the figure: 1 is the source of the gas bag, and 2 is air pressure definite value valve, and 3 is tensimeter, and 4 are the tightness test device, 5,5 ' be container, 6 is oil sprayer, and 7 is gate valve, and 8 is filtrator, and 9 is reduction valve, 10 is solenoid valve.
Embodiment
Referring to Fig. 1 and Fig. 2, an end of source of the gas bag 1 is connected with switch, and the other end is connected with the air pressure definite value valve 2 with fine adjustment function.Be provided with filtrator 8 behind the source of the gas bag 1 in order to filtering gas, reduction valve 9 and oil sprayer 6, filtrator 8, reduction valve 9 and oil sprayer 10 connect and compose verification pressure control to gas by gas piping, are used to form the passage of pilot-gas.What air pressure definite value valve 2 adopted is reduction valve, and air pressure definite value valve will be from the first definite value of the pressure of source of the gas institute gas at 0.1MPa, to satisfy the atmospheric pressure value that is input in the tightness test device.Tensimeter 3 with high precision value is connected between air pressure definite value valve and the tightness test device input port by threeway.Tightness test device output port by threeway respectively by gas piping and container 5,5 ' be connected, container 5,5 ' with the sealing-plug sealing, two containers 5,5 ' volume identical.Airtight container 5 ' and threeway between be connected with the gate valve 7 that is used for the pilot-gas flow, the original state of this gate valve is for closing.
Use the process of verification tightness test device of the present invention to be:
With air pressure definite value valve the pressure of source of the gas bag gas is provided with 0.1Mpa, gate valve 7 is a closed condition.With the power switch closure, start the tightness test device, by the gas of exporting in the source of the gas bag successively by air pressure definite value valve, tensimeter, enter tightness test device 4, to container 5 inflations.When the tightness test device when inflationtime enters into the retention time, instrument keeps pilot lamp bright, the solenoid valve 10 in the tightness test device cuts out automatically, source of the gas no longer enters tightness test device and this school inspection instrument.
Open gate valve, container 5 and container 5 ' be communicated with, whole tightness test device and this school inspection instrument are communicated with.
According to the bernoulli equation formula:
P
1V
1=P
2V
2(temperature variation and gas are ignored in the low-pressure lower density)
If container 5,5 ' middle volume change is identical, then volume increases by 1 times, P
1Pressure descends 1/2;
If the difference of container 5 ≠ container 5 ' volume change, then container 6 volumes also change P
1Pressure is pressed v
1/ v
2The decline of ratio, its test pressure P
2Be calculated as follows:
P
2Pressure descends and to enter stage detection time at the tightness test device and can show on display screen automatically, this moment container 5 ' volume change be equivalent to the leakage rate of instrument.
Because of there are spatial volume (this volume does not change) in tightness test device itself and gas piping inner chamber, the variation of whole volume occur in container 5 ', so test pressure P
2Be equivalent to:
In the formula:
v
1: the volume change of expression container 5;
v
2: v
2=b+v
1+ v
1' (wherein: b represent container 5 ' volume change);
v
1': the spatial volume in tightness test device and the pipeline (this volume is not easy to calculate, and can ignore when calculating).
Size by changing container 5 ' volume b (changes greatly more, pressure descends big more, otherwise changes more for a short time, and pressure descends more little) writes down the leakage value that the tightness test device is indicated respectively, and whether can differentiate the work of tightness test device normal.
Also but primary Calculation goes out leakage rate and whether equals v
2Value, thereby differentiate the positive normal manner of tightness test device.
Referring to Fig. 3, Fig. 4.Change the set-point of pressure, the linearity of tightness test device is determined in the variation that can compare container 5,5 ' middle volume according to the method described above.Test constantly heightening under the pressure, curve is sexual state linearly, judges that then the leakage rate of tightness test device keeps in allowed limits, can adapt to detection measured workpiece basic, normal, high pressure under; As nonlinear state appears, judge that then leaking appears in the tightness test device.
Therefore, by adjusting its gas volume repeatedly, the pressure of observing tested tightness test device changes, and whether can differentiate the tightness test device has leakage.
In sum, if the gas in the container 5 partly be discharged into container 5 ' in, container 5 ' in gas pressure change can on the display screen of tightness test device, show automatically, show that the tightness test device has leakage, this moment, the variation of container 5 ' gas volume was equivalent to the leakage rate of whole detector; If the gas in the container 5 be discharged into container 5 ', wherein gas volume does not change, and does not show on the display screen of tightness test device to change, and shows that the tightness test device does not leak.
The product that the tightness test device of present embodiment adopts French ATEQ company to produce, the product that the source of the gas bag adopts Chongqing baby compressor factory to produce.
Claims (4)
1. tester that is used for the tightness test device, comprise the tightness test device, it is characterized in that: the input port of described tightness test device (4) is connected with tensimeter (3) by gas piping, rain glass (3) connects air pressure definite value valve (2) and source of the gas bag (1) successively, the output port threeway of tightness test device is connected with two containers (5,5 '), is provided with the gate valve (7) that is used for the pilot-gas flow between container (5 ') and the threeway.
2. the tester that is used for the tightness test device according to claim 1 is characterized in that: described container (5,5 ') bottleneck is by sealing-plug (8) sealing.
3. the tester that is used for the tightness test device according to claim 1 is characterized in that: described container (5,5 ') volume is identical.
4. with the method for tester verification tightness test device as claimed in claim 1, it is characterized in that may further comprise the steps:
(1) with air pressure definite value valve initial bleed pressure being set is 0.1Mpa, changes the set-point of detected pressures in verification subsequently;
(2) closing gate valve (7) is opened the power supply of air pressure definite value valve, starts the tightness test device, to container (5) inflation, when the maintenance pilot lamp of tightness test device is bright, opens gate valve;
(3) the relatively variation of the middle volume of container (5,5 ');
(4) gas of adjusting container repeatedly changes, and judges by the leakage rate of tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610054499 CN1888843A (en) | 2006-07-28 | 2006-07-28 | Checking meter and testing method for air-tight tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610054499 CN1888843A (en) | 2006-07-28 | 2006-07-28 | Checking meter and testing method for air-tight tester |
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| Publication Number | Publication Date |
|---|---|
| CN1888843A true CN1888843A (en) | 2007-01-03 |
Family
ID=37578132
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|---|---|---|---|
| CN 200610054499 Pending CN1888843A (en) | 2006-07-28 | 2006-07-28 | Checking meter and testing method for air-tight tester |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788220B (en) * | 2009-01-23 | 2012-08-08 | 博西华家用电器有限公司 | Refrigeration appliance, container for refrigeration appliance and air tightness detecting method |
| CN103364136A (en) * | 2013-06-09 | 2013-10-23 | 黄嘉华 | Signal generating system and method of touch force sensor measuring pulse |
| CN106323567A (en) * | 2016-08-05 | 2017-01-11 | 中山市恒辉自动化科技有限公司 | Differential pressure method part air-tightness detection device |
| CN106556419A (en) * | 2015-09-25 | 2017-04-05 | 北京振兴计量测试研究所 | Low pressure test chamber calibrating installation |
| CN107179159A (en) * | 2017-06-13 | 2017-09-19 | 国网山东省电力公司电力科学研究院 | The check system and method for a kind of SF6 on-line monitoring alarm device for leakage |
| CN109297651A (en) * | 2018-08-16 | 2019-02-01 | 广州市上腾电子科技有限公司 | A kind of self checking method for leak detection system |
| CN111579155A (en) * | 2020-06-18 | 2020-08-25 | 北京迈世高科电子技术有限公司 | Airtight appearance inspection frock |
-
2006
- 2006-07-28 CN CN 200610054499 patent/CN1888843A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788220B (en) * | 2009-01-23 | 2012-08-08 | 博西华家用电器有限公司 | Refrigeration appliance, container for refrigeration appliance and air tightness detecting method |
| CN103364136A (en) * | 2013-06-09 | 2013-10-23 | 黄嘉华 | Signal generating system and method of touch force sensor measuring pulse |
| CN106556419A (en) * | 2015-09-25 | 2017-04-05 | 北京振兴计量测试研究所 | Low pressure test chamber calibrating installation |
| CN106323567A (en) * | 2016-08-05 | 2017-01-11 | 中山市恒辉自动化科技有限公司 | Differential pressure method part air-tightness detection device |
| CN107179159A (en) * | 2017-06-13 | 2017-09-19 | 国网山东省电力公司电力科学研究院 | The check system and method for a kind of SF6 on-line monitoring alarm device for leakage |
| CN109297651A (en) * | 2018-08-16 | 2019-02-01 | 广州市上腾电子科技有限公司 | A kind of self checking method for leak detection system |
| CN109297651B (en) * | 2018-08-16 | 2022-03-25 | 广州阿普顿自动化系统有限公司 | Self-checking method for leakage detection system |
| CN111579155A (en) * | 2020-06-18 | 2020-08-25 | 北京迈世高科电子技术有限公司 | Airtight appearance inspection frock |
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