CN104089745A - Sampling and lofting device and sampling and lofting calibration method for satellite total leak rate testing - Google Patents
Sampling and lofting device and sampling and lofting calibration method for satellite total leak rate testing Download PDFInfo
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- CN104089745A CN104089745A CN201410369471.XA CN201410369471A CN104089745A CN 104089745 A CN104089745 A CN 104089745A CN 201410369471 A CN201410369471 A CN 201410369471A CN 104089745 A CN104089745 A CN 104089745A
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- integral leakage
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Abstract
The invention discloses a sampling and lofting device used in the satellite total leak rate testing process. The device mainly comprises a cavity with the fixed volume. A transverse pipe and a longitudinal pipe are crossed and are communicated to the top of the cavity. The interior of the transverse pipe and the interior of the longitudinal pipe are of a crossed communicated structure. The two ends of the transverse pipe are used as a gas sampling opening and a gas lofting opening respectively for total leak rate testing. The top of the longitudinal pipe is provided with a switch valve used for controlling gas inside the cavity to enter and get out of the transverse pipe in the sampling and lofting process, and an O-shaped sealing ring is arranged between the switch valve and the inner side of the longitudinal pipe to prevent gas from escaping from the upper end of the longitudinal pipe in the sampling and lofting process. The invention further provides a sampling and lofting calibration method for satellite total leak rate testing through the sampling and lofting device. Compared with the prior art, calibration of the testing system can be rapidly carried out on the satellite total leak rate testing site, the calibration period is shortened, the leak rate deviations of a standard leak hole caused by environment changes are effectively avoided, and testing system calibration accuracy is improved.
Description
Technical field
The present invention relates to a kind of system calibrating method for satellite accumulative integral leakage test process, be particularly related to and a kind ofly sample and the device of setting-out and the method for demarcation by minimum gas, complete the staking-out work of test macro in integral leakage test process, finally realize the quantitative test work of satellite integral leakage test.
Background technology
Along with the development of spationautics, index demand to the test of satellite integral leakage is more and more higher, accuracy requirement is more and more higher, the test job of satellite integral leakage is by the probe gas being filled with in the sealing system of hunting leak with working pressure is consistent in orbit by satellite, put into the collection container of a sealing to the probe gas amount accumulation regular hour t leaking, by the concentration change A1 of probe gas in collection container, measure by the integral leakage of leak detection system with instrument.Its test process belongs to relative measurement, after need to demarcating test macro, could determine the integral leakage data that satellite is final.
The test macro scaling method adopting is at present to utilize referance leak to demarcate, referance leak calibration process is: first will in tested satellite sealing system, not add any probe gas, put into the collection container of above-mentioned sealing, in container, put into 1 referance leak Q1 that leak rate is known, accumulate with above-mentioned identical time t, cause the variable quantity A2 of probe gas amount concentration in collection container with the leakage of instrument test referance leak, the integral leakage Q=A1 × Q1/A2 of the system of being stopped leakage in the roof.Adopt referance leak to demarcate and there is following characteristics test macro:
1) leak rate of referance leak is calibrated through metering mechanism, and data are reliable;
2) referance leak need to be placed in container and accumulate with the same time t of satellite, and t is generally more than 24 hours.
Meanwhile, in the process that adopts referance leak to demarcate test macro, there is following shortcoming:
1) the demarcation cycle long, need to, with satellite accumulation leak detection time consistency, be generally more than 24;
2) it is long that referance leak needs the cycle of professional metering mechanism calibration;
3) environment that referance leak uses can cause the deviation of self leak rate after changing, and can be accumulated in the final test data of integral leakage, causes the deviation of test data;
4) referance leak is generally the leak rate for gases such as helium, air, nitrogen, only has helium to can be used as probe gas and uses.
The present invention proposes a kind of satellite integral leakage with picking and placeing sampling device and picking and placeing sample scaling method, can carry out fast in satellite integral leakage test site the staking-out work of test macro, can shorten the demarcation cycle, the leak rate deviation of the referance leak having caused while effectively having avoided environment to change, improved the accuracy that test macro is demarcated, that can realize multiple probe gas simultaneously picks and places sample calibration process.
Summary of the invention
The object of this invention is to provide picking and placeing sampling device and picking and placeing sample scaling method in a kind of satellite integral leakage test process.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of satellite integral leakage is tested with picking and placeing sampling device, comprise that cavity, the cavity top with fixed volume are communicated with the transverse tube and the longitudinal tubule (L tubule) that are provided with cross, the inside of transverse tube and longitudinal tubule (L tubule) is cross connectivity structure, transverse tube two ends are used separately as gas sample mouth and the gas setting-out mouth of integral leakage test use, longitudinal tubule (L tubule) top be provided with controlled valve with respectively for sampling and setting-out process to the gas in cavity pass in and out that transverse tube is controlled, the inner side of controlled valve and longitudinal tubule (L tubule) is provided with 0 RunddichtringO and overflows from longitudinal tubule (L tubule) upper end picking and placeing in sample process to prevent gas.
Further, described fixed volume refers to the volume of 20ml left and right, be not more than ± 1ml of its deviation, and after demarcating, determine its accurate volume V.
Further, described controlled valve is the needle-valve with the cavity function that can seal fixed volume.
Wherein, the spicule of needle-valve extend into transverse tube below and carries out the control of gas turnover.
Wherein, the transverse tube of right-angled intersection, longitudinal tubule (L tubule) and cavity are welded by stainless steel material, and its weld seam leak rate requires to be not more than 1 × 10
-8pa.m
3/ s, controlled valve and the sealing property index request having between the cavity 2 of fixed volume are not more than 1 × 10
-7pa.m
3/ s, the integral leakage index request that picks and places sampling device is not more than 1 × 10
-5pa.m
3/ s.
Utilize above-mentioned pick and place that sampling device carries out the test of satellite integral leakage pick and place sample scaling method, comprise the steps:
1) probe gas be filled with satellite by check system after, satellite is remained on to predetermined time t in closed container, with the concentration increment A1 of probe gas in apparatus measures closed container;
2) the gas sample mouth of sampler is connected with the source of the gas of probe gas, confining gas setting-out mouth, opening switch valve, vacuumizes the cavity of sampler orthobaric volume;
3) sample, the standard volume that probe gas is filled with to sampler is in the cavity of V (ml), until pressure reaches 0.5MPa, and closing switch valve, sampling process finishes;
4) disconnect being connected and sealing sample tap of gas sample mouth and probe gas, gas setting-out mouth is connected with above-mentioned airtight container, open controlled valve, carry out setting-out work;
5) setting-out finishes rear closing switch valve, utilizes identical measuring method to measure the further increment A2 of probe gas concentration in the airtight container of setting-out front and back, completes demarcation;
6) utilize following formula to calculate the integral leakage Q of satellite, complete the test job of integral leakage, and Q=(0.5 × V) × A1/ (A2 × t).
Wherein, the volume of fixed volume is 20ml ± 1ml.
Wherein, probe gas is helium, Krypton, carbon tetrafluoride or sulfur hexafluoride.
Wherein, schedule time t is conventionally more than 24 hours.
The present invention proposes a kind of satellite integral leakage with picking and placeing sampling device and picking and placeing sample scaling method, can carry out fast in satellite integral leakage test site the staking-out work of test macro, can shorten the demarcation cycle, the leak rate deviation of the referance leak having caused while effectively having avoided environment to change, improved the accuracy that test macro is demarcated, that realizes multiple probe gas picks and places sample calibration process.
Brief description of the drawings
Fig. 1 is the satellite integral leakage test structural representation that picks and places sampling device of the present invention.
Wherein, 1 is gas sample mouth; 2 for having the cavity of fixed volume; 3 is gas setting-out mouth; 4 is 0 RunddichtringO; 5 controlled valves.
Embodiment
What below introduce is the embodiment as content of the present invention, below by embodiment, described content of the present invention is further illustrated.Certainly, describing following embodiment is only the content of example different aspect of the present invention, and should not be construed as the restriction scope of the invention.
Fig. 1 discloses the satellite integral leakage test structural representation that picks and places sampling device of the present invention.This picks and places sampling device, comprises and has the parts such as cavity 2, gas setting-out mouth 3,0 RunddichtringO 4 and the controlled valve 5 of gas sample mouth 1, fixed volume.The major part that the cavity 2 wherein with fixed volume is sampler, its volume is important parameter, the sealing property index request of general satellite is that the accumulation leakage rate of 24 hours is about 10Pa.m
3, i.e. 10MPa.ml.Because tonometric ratio of precision cubing precision is high, choose the volume of 20ml, now corresponding pressure is 0.5MPa, can take into account sampling precision and the complexity of pressure and volume.Design choose ± 1ml of manufacture deviation therefore choose the theoretical displacement of 20ml.The most professional metering mechanism demarcates and determines its true volume V, as the true volume of probe gas sampling setting-out.
Transverse tube, longitudinal tubule (L tubule) and the cavity of right-angled intersection are welded by stainless steel material, and the leak rate index request of its weld seam and material itself is not more than 1 × 10
-8pa.m
3/ s.
During due to sampling, need to open controlled valve 5, sampling finishes rear closing switch valve 5, by emptying the probe gas at all the other positions, gas setting-out mouth 3 is connected in the collection container that satellite integral leakage test uses, open controlled valve 5 and realize the setting-out work of probe gas.Gas flow in order to ensure sampling was not leaked before setting-out, was realized controlled valve 5 and was had the sealing of the cavity 2 of fixed volume by 0 RunddichtringO 4.Controlled valve and the sealing property index request having between the cavity 2 of fixed volume are not more than 1 × 10
-7pa.m
3/ s.
After picking and placeing sampling device and having developed, need to test its overall sealing performance, concrete grammar is, sealing gas setting-out mouth 3, helium gas source is connected to gas sample mouth, opens controlled valve and be filled with helium to picking and placeing sampling device, until pressure reaches 1MPa, utilize helium mass spectrum suction gun leak detecting respectively above-mentioned material body, weld seam and 0 RunddichtringO place to be carried out to leak rate test, leak rate index need to meet These parameters requirement; By vacuum testing, the above-mentioned sampling device that picks and places is carried out to integral leakage test again, integral leakage index request is not more than 1 × 10
-5pa.m
3/ s.
Finally send professional metering mechanism to carry out useful volume test in this device, provide the orthobaric volume V that picks and places sampling device.
Utilize above-mentioned pick and place that sampling device carries out the test of satellite integral leakage pick and place sample scaling method, comprise the steps:
1) probe gas be filled with satellite by check system after, satellite is remained on to predetermined time t=24h in closed container, measure the concentration increment A1 of probe gas in closed container;
2) the gas sample mouth that picks and places sampling device is connected with the source of the gas of probe gas, confining gas setting-out mouth, opening switch valve, vacuumizes the cavity of sampler orthobaric volume;
3) sample, the standard volume that probe gas is filled with to sampler is in the cavity of V (ml), until pressure reaches 0.5MPa, and closing switch valve, sampling process finishes;
4) disconnect being connected and sealing sample tap of gas sample mouth and probe gas, gas setting-out mouth is connected with above-mentioned airtight container, open controlled valve, carry out setting-out work;
5) setting-out finishes rear closing switch valve, utilizes identical measuring method to measure the further increment A2 of probe gas concentration in the airtight container of setting-out front and back, completes demarcation;
6) utilize following formula to calculate the integral leakage Q of satellite, complete the test job of integral leakage, and Q=(0.5 × V) × A1/ (A2 × t).
In an embodiment, probe gas can be chosen as helium.Use helium in the time of probe gas, can adopt the probe gas concentration increment in helium mass spectrometer leak detecting technology test airtight container.
In other alternate embodiments, probe gas can be Krypton, carbon tetrafluoride or sulfur hexafluoride, and this does not affect the enforcement of the inventive method.Be helium, Krypton, carbon tetrafluoride or sulfur hexafluoride according to cost priority selecting sequence.
If the tested system of satellite is two or more, can adopt repeatedly duplicate measurements, the method that repeats system to demarcate.Also can adopt different test macros is filled with different probe gas, be no more than at most above-mentioned 4 kinds of probe gas simultaneously.Utilize four-electrode spectrum leak locator to carry out the increment of probe gas concentration in airtight container simultaneously, timing signal is with picking and placeing according to the method described above sample for different probe gas respectively, utilize four-electrode spectrum leak locator to test different probe gas and pick and place the increment that causes probe gas concentration in airtight container before and after sample, complete the staking-out work that multiple probe gas picks and places sample, thereby complete the integral leakage test job of multiple different systems simultaneously.
In the time that tested satellite integral leakage index improves, sampling lofting amount dwindles, and sampling work becomes difficulty, and uncertainty increases.Now by adopting the method for preparation standard probe gas concentration to complete the sampling setting-out work of probe gas.In the time that an order of magnitude of integral leakage index raising of tested satellite dwindles 10 times, adopt the method for dwindling probe gas concentration, adopt 10% probe gas concentration gases to pick and place sample staking-out work; If when 2 orders of magnitude of the integral leakage index of tested satellite raising dwindle 100 times, can adopt 1% probe gas concentration gases to pick and place sample staking-out work.By be greater than the gas of preparing required probe gas concentration in the bulk container of 40L at volume, can accurately realize the sample process that picks and places of micro-probe gas, can not have influence on the precision of sampling setting-out yet.
The integral leakage index of tested satellite improves 1 order of magnitude, can adopt 10% probe gas concentration gases to pick and place sample demarcates, before sampling, first configure 10% probe gas, when sampling, the gas sample mouth that picks and places sampling device is connected with the source of the gas that configures probe gas, other job steps are with above-mentioned to pick and place sample demarcating steps consistent, increase the concentration of probe gas at the integral leakage Q formula that calculates satellite, and system under test (SUT) integral leakage Q=(0.5 × V × 10%) × A1/ (A2 × t).
The integral leakage index of tested satellite improves 2 orders of magnitude, can adopt 1% probe gas concentration gases to pick and place sample demarcates, before sampling, first configure 1% probe gas, when sampling, the gas sample mouth that picks and places sampling device is connected with the source of the gas that configures probe gas, other job steps are with above-mentioned to pick and place sample demarcating steps consistent, increase the concentration of probe gas at the integral leakage Q formula that calculates satellite, and system under test (SUT) integral leakage Q=(0.5 × V × 1%) × A1/ (A2 × t).
Although above the specific embodiment of the present invention has been given to describe in detail and explanation; but what should indicate is; we can carry out various equivalences to above-mentioned embodiment according to conception of the present invention and change and amendment; when its function producing does not exceed spiritual that instructions and accompanying drawing contain yet, all should be within protection scope of the present invention.
Claims (9)
1. a satellite integral leakage is tested with picking and placeing sampling device, comprise that cavity, the cavity top with fixed volume are communicated with the transverse tube and the longitudinal tubule (L tubule) that are provided with cross, the inside of transverse tube and longitudinal tubule (L tubule) is cross connectivity structure, transverse tube two ends are used separately as gas sample mouth and the gas setting-out mouth of integral leakage test use, longitudinal tubule (L tubule) top be provided with controlled valve with respectively for sampling and setting-out process to the gas in cavity pass in and out that transverse tube is controlled, the inner side of controlled valve and longitudinal tubule (L tubule) is provided with 0 RunddichtringO and overflows from longitudinal tubule (L tubule) upper end picking and placeing in sample process to prevent gas.
2. satellite integral leakage as claimed in claim 1 is tested with picking and placeing sampling device, and wherein, described fixed volume refers to the volume of 20ml left and right, be not more than ± 1ml of its deviation, and after demarcating, determine its accurate volume V.
3. satellite integral leakage as claimed in claim 1 is tested with picking and placeing sampling device, and wherein, described controlled valve is the needle-valve with the cavity function that can seal fixed volume.
4. satellite integral leakage as claimed in claim 3 is tested with picking and placeing sampling device, and wherein, the spicule of needle-valve extend into transverse tube below carries out the control of gas turnover.
5. satellite integral leakage as claimed in claim 1 is tested with picking and placeing sampling device, and wherein, the transverse tube of right-angled intersection, longitudinal tubule (L tubule) and cavity are welded by stainless steel material, and its weld seam leak rate requires to be not more than 1 × 10
-8pa.m
3/ s, controlled valve and the sealing property index request having between the cavity 2 of fixed volume are not more than 1 × 10
-7pa.m
3/ s, the integral leakage index request that picks and places sampling device is not more than 1 × 10
-5pa.m
3/ s.
6. utilize described in claim 1-5 any one pick and place that sampling device carries out the test of satellite integral leakage pick and place sample scaling method, comprise the steps:
1) probe gas be filled with satellite by check system after, satellite is remained on to predetermined time t in closed container, with the concentration increment A1 of probe gas in apparatus measures closed container;
2) the gas sample mouth of described sampler is connected with the source of the gas of probe gas, confining gas setting-out mouth, opening switch valve, vacuumizes the cavity of sampler orthobaric volume;
3) sample, the standard volume that probe gas is filled with to sampler is in the cavity of V (ml), until pressure reaches 0.5MPa, and closing switch valve, sampling process finishes;
4) disconnect being connected and sealing sample tap of gas sample mouth and probe gas, gas setting-out mouth is connected with above-mentioned airtight container, open controlled valve, carry out setting-out work;
5) setting-out finishes rear closing switch valve, utilizes identical measuring method to measure the further increment A2 of probe gas concentration in the airtight container of setting-out front and back, completes demarcation;
6) utilize following formula to calculate the integral leakage Q of satellite, complete the test job of integral leakage, and Q=(0.5 × V) × A1/ (A2 × t).
7. method as claimed in claim 6, wherein, the volume of described fixed volume is 20ml ± 1ml.
8. method as claimed in claim 6, wherein, probe gas is helium, Krypton, carbon tetrafluoride or sulfur hexafluoride.
9. method as claimed in claim 6, wherein, schedule time t is conventionally more than 24 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410369471.XA CN104089745B (en) | 2014-07-30 | 2014-07-30 | The test of satellite integral leakage is with picking and placeing sampling device and pick and place sample scaling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410369471.XA CN104089745B (en) | 2014-07-30 | 2014-07-30 | The test of satellite integral leakage is with picking and placeing sampling device and pick and place sample scaling method |
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| CN104089745A true CN104089745A (en) | 2014-10-08 |
| CN104089745B CN104089745B (en) | 2017-06-16 |
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| CN104089745B (en) | 2017-06-16 |
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