CN109238597B - A kind of detection method of differential pressure type air-tightness leakage detection apparatus and its leakage flow - Google Patents
A kind of detection method of differential pressure type air-tightness leakage detection apparatus and its leakage flow Download PDFInfo
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- CN109238597B CN109238597B CN201811200097.5A CN201811200097A CN109238597B CN 109238597 B CN109238597 B CN 109238597B CN 201811200097 A CN201811200097 A CN 201811200097A CN 109238597 B CN109238597 B CN 109238597B
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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
- G01M3/32—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 for containers, e.g. radiators
- G01M3/3236—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 for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—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 for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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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
- G01M3/32—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 for containers, e.g. radiators
- G01M3/3236—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 for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3254—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 for containers, e.g. radiators by monitoring the interior space of the containers using a flow detector
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses the detection methods of a kind of differential pressure type air-tightness leakage detection apparatus and its leakage flow, and device includes: gas source, pressure regulator valve, the first pneumatic operated valve, the second pneumatic operated valve, third pneumatic operated valve, the 4th pneumatic operated valve, the 5th pneumatic operated valve, barometer, differential pressure pick-up, volumetric standard, tested container, muffler and additional reservoir.For tested container volume whether it is known that the present invention provides two kinds of leakage flow rate testing methods: i.e. leakage flow rate testing methods of the tested container under known and two kinds of situations of unknown volume；For tested container: the leakage flow detection first step under known volume situation need to first disconnect additional reservoir；The leakage flow detection first step under unknown volume situation need to first connect additional reservoir, and remaining step of two kinds of detection methods is similar compared with detection method.The invention has the advantages that: it can be not only used for leakage flow detection of the tested container under known volume situation, and can be used for leakage flow detection of the tested container under unknown volume situation.
Description
Technical field
The present invention relates to air-leakage test technical field, particularly relate to a kind of differential pressure type air-tightness leakage detection apparatus and
The detection method of its leakage flow, can be not only used for leakage flow of detection tested container in the case of known volume, and can be with
For detecting leakage flow of tested container in the case of unknown volume.
Background technique
Common differential pressure type air-tightness leak detector at present, as shown in Figure 1, usually by intake and exhaust control valve 1, the first valve 2,
Second valve 3, differential pressure pick-up 10, benchmark container 8 and tested container 9 are constituted；Its working principle is that: by one it is controlled into
Gas exhausting valve connects benchmark container 8 and tested container 9, when detecting, is first inflated simultaneously to them, to it
The pressure of the two when reaching consistent and equal with systemic presupposition pressure value, be then shut off their valve of connection, and stand one
After the meeting, it will not be leaked because of benchmark container 8 to be totally-enclosed, therefore its pressure is the blowing pressure and guarantee is constant, and if tested container 9 is deposited
Pressure decline will be will appear in leakage, and its pressure fall can increase with the increase of quantity of gas leakage, then at this time may be used
The differential pressure pick-up 10 at gas outlet by being connected across the first valve 2 and the second valve 3 observes the two container (i.e. bases
Quasi- container 8 and tested container 9) pressure difference situation of change, measured according to differential pressure pick-up 10 pressure difference value variation can know
Know the problem of tested container 9 is leaked with the presence or absence of gas.
Although can quickly judge there is air-tightness to want using above-mentioned differential pressure type air-tightness leak detector as shown in Figure 1
The product asked whether there is gas leakage problem, but there is also some defects, such as: as shown in fig. 1, existing differential pressure type gas
Most of charge, exhaust gas circuit of close property leak detector is to be overlapped, after the completion of carrying out leak detection to the product for having air-tightness requirement,
The compressed air being filled into the product (i.e. tested container 9 in Fig. 1) of air-tightness requirement can be examined by differential pressure type air-tightness
Instrument discharge is leaked, at the same time, the impurity such as oil, water, dust in product can be also entrained into inside differential pressure type air-tightness leak detector, and
As gas is in differential pressure type air-tightness leak detector internal flow, it will lead to the impurity such as the oil in examined product, water, dust in this way and exist
It is attached in last exhaust process inside differential pressure type air-tightness leak detector, and then leads to its core component such as differential pressure pick-up 10
Damage, or valve tightness is caused to decline.
In response to this problem, it is CN203024944U, Patent No. that existing producer, which provides Authorization Notice No., at present
A kind of improvement project (as shown in Figure 2) of the Chinese patent " high-precision differential pressure type air-tightness leak detector " of 201220638034.X,
Being somebody's turn to do " a kind of high-precision differential pressure type air-tightness leak detector " is mainly that differential pressure type air-tightness leak detector basis shown in Fig. 1 carries out
It improves, specifically a third valve 4, the 5th valve 6 is further added by the outlet side of the first valve 2, in the outlet of the second valve 3
End is further added by the 4th valve 5 and the 6th valve 7；Pass through the third valve 4, the 4th valve 5, the 5th valve 6 and added
Six valves 7 can be effectively by hardware line isolation inside and outside leak detector, so that detection gas are divided into two-way discharge, to guarantee
Detection gas in differential pressure pick-up 10 are always clean, and then avoid its detected product band enters oil, water, dust etc.
Impurity, which pollutes, to be damaged, and influences measurement accuracy.
Although existing differential pressure type air-tightness leak detector as shown in Figure 1 or 2 can be used for when it is leaked
Leakage flow caused by tested container 9 is calculated, but existing differential pressure type air-tightness leak detector is in known tested appearance
In the case where 9 volume of device, its specific leakage flow numerical value just can be clearly calculated；And for tested container 9 volume not
In the case where knowing, there is presently no a kind of relatively effective device or method can get its specific leakage flow.
Summary of the invention
The purpose of the present invention is to provide a kind of leakages that can be used to detection tested container in the case of known volume
Flow, and can be used for detecting the differential pressure type air-tightness leakage detection apparatus of leakage flow of tested container in the case of unknown volume
And its detection method of leakage flow, for solving the problems, such as background technique.
To achieve the above object, the technical scheme adopted by the invention is as follows: a kind of differential pressure type air-tightness leakage detection apparatus, include gas
Source, pressure regulator valve, the first pneumatic operated valve, the second pneumatic operated valve, third pneumatic operated valve, the 4th pneumatic operated valve, differential pressure pick-up, volumetric standard and by
Xylometer；The gas source is connect by the first tracheae with the air inlet of the pressure regulator valve, and the gas outlet of the pressure regulator valve passes through the
Two tracheaes are connect with the air inlet of first pneumatic operated valve, and the gas outlet of first pneumatic operated valve is by third tracheae respectively with the
One end of four tracheaes and the connection of one end of the 6th tracheae, the other end of the 4th tracheae and the air inlet of the second pneumatic operated valve connect
It connects, the other end of the 6th tracheae is connect with one end of the 7th tracheae, the other end and third pneumatic operated valve of the 7th tracheae
Air inlet connection, the gas outlet of second pneumatic operated valve by the 5th tracheae respectively with volumetric standard and differential pressure pick-up one
The gas outlet of end connection, the third pneumatic operated valve is connected with the other end of tested container and differential pressure pick-up respectively by the 8th tracheae
It connects；
To achieve the purpose of the present invention, differential pressure type air-tightness leakage detection apparatus provided by the invention also includes the 5th pneumatic
Valve and additional reservoir, the air inlet of the 5th pneumatic operated valve is by the 11st tracheae respectively with the 6th tracheae far from third gas
One end of pipe and the 4th tracheae connects and connect with the 7th tracheae far from one end of third pneumatic operated valve, and the described 5th is pneumatic
The gas outlet of valve is connect by the 12nd tracheae with the additional reservoir；
The tested container is the container of a known volume size or unknown volume size；
The additional reservoir is the volumetric standard of a known volume size.
Further, to prevent foreign matter from entering the inside that device measures gas circuit, and then the core in measurement gas circuit is damaged
Instrument is additionally provided with a check-valves on the 8th tracheae of the gas outlet and tested container that connect the third pneumatic operated valve, described
The air inlet of check-valves is connect with one end of the gas outlet of the third pneumatic operated valve and the differential pressure pick-up respectively, the non-return
The gas outlet of valve is connect with the tested container.
Further, be to eliminate the noise that generates in gas discharge process, the gas outlet for connecting the third pneumatic operated valve with
Be also connected with the 9th tracheae on 8th tracheae of tested container, described 9th tracheae one end by the 8th tracheae respectively with institute
The gas outlet and tested container connection, the 9th tracheae other end for stating check-valves are connect with the air inlet of the 4th pneumatic operated valve, institute
The gas outlet for stating the 4th pneumatic operated valve is connect by the tenth tracheae with muffler.
Further, in order to the accurate air pressure change situation grasped in measuring device in real time, difference provided by the invention
Pressure type air-tightness leakage detection apparatus, also includes barometer, and the barometer is arranged on the 6th tracheae or the 6th tracheae and the
The connecting portion of three tracheaes and the 4th tracheae.
Based on differential pressure type air-tightness leakage detection apparatus provided by the invention, the differential pressure type gas is used the present invention also provides a kind of
Leakage flow rate testing methods of the close property leakage detection apparatus in known tested container volume size, it includes following steps:
Step 1: closing the 5th pneumatic operated valve；
Step 2: the tested container of volumetric standard and known volume size is inflated；
The first pneumatic operated valve, the second pneumatic operated valve, third pneumatic operated valve are opened, the 4th pneumatic operated valve is closed, gas source is connected, is given by gas source
The tested container inflation of volumetric standard, known volume size；
Step 3: the air pressure in volumetric standard and the tested container of known volume size being allowed to reach balance for the first time；
By the air pressure size in barometer real-time detection gas circuit, when barometer detects that the gas pressure in gas circuit reaches
After the preset pressure value of system, the first pneumatic operated valve is closed, in volumetric standard and the tested container of known volume size
Air pressure reaches to be balanced for the first time；
Step 4: the air pressure in volumetric standard and the tested container of known volume size being allowed to reach second of balance；
The second pneumatic operated valve and third pneumatic operated valve are closed, to the air pressure in volumetric standard and the tested container of known volume size
Reach second of balance；
Step 5: obtaining pressure difference change rate, calculate leakage flow；
(1) known to hold if the tested container of known volume size is there are when gas leakage after being balanced to second
Air pressure in the tested container of product size can constantly decline, and can be detected in a period of time Δ t by differential pressure pick-up at this time
The pressure difference changes delta p of volumetric standard and tested container, the pressure difference change rate to obtain gas circuit is Δ p/ Δ t according to this；
(2) the volume V of tested container is obtained2And the pressure difference change rate Δ p/ Δ t in gas circuit, it is calculated by formula (a)
The leakage flow Q of the tested container (11) of known volume size out；
In formula: V2Indicate the volume of tested container；
p0Indicate atmospheric pressure；
Step 6: exhaust terminates detection；
Open the second pneumatic operated valve, third pneumatic operated valve and the 4th pneumatic operated valve, by volumetric standard, known volume tested container in
Gas via being discharged after muffler noise reduction.
Based on differential pressure type air-tightness leakage detection apparatus provided by the invention, the differential pressure type gas is used the present invention also provides a kind of
Leakage flow rate testing methods of the close property leakage detection apparatus under unknown tested container volume condition, it includes following steps:
Step 1: opening the 5th pneumatic operated valve；
Step 2: the additional reservoir inflation of tested container and known volume size to volumetric standard, unknown volume size；
The first pneumatic operated valve, the second pneumatic operated valve, third pneumatic operated valve are opened, the 4th pneumatic operated valve is closed, gas source is connected, is given by gas source
The additional reservoir of volumetric standard, the tested container of unknown volume size and known volume size is inflated；
Step 3: allowing gas in the additional reservoir of volumetric standard, the tested container of unknown volume size and known volume size
Pressure reaches to be balanced for the first time；
By the air pressure size in barometer real-time detection gas circuit, when barometer detects that the gas pressure in gas circuit reaches
After the preset pressure value of system, the first pneumatic operated valve is closed, to volumetric standard, the tested container of unknown volume size and known
Air pressure in the additional reservoir of volume size progressively reaches to be balanced for the first time；
Step 4: allow volumetric standard, the tested container of unknown volume size and known volume size additional reservoir air pressure
Reach second of balance；
The second pneumatic operated valve is closed, the auxiliary to volumetric standard, the tested container of unknown volume size and known volume size
Air pressure in container reaches second of balance；
Step 5: measurement first time pressure difference change rate；
After being balanced to second, if there is leakage in the tested container of unknown volume size, known volume size
Air pressure in additional reservoir and the tested container of unknown volume size can constantly decline, and measure one by differential pressure pick-up at this time
Section time Δ t1The pressure differential deltap p of internal standard container and the tested container of unknown volume1, acquisition first time pressure difference change rate is Δ p1/
Δt1；
Step 6: second of pressure difference change rate of measurement；
Third pneumatic operated valve is closed, a period of time Δ t is measured by differential pressure pick-up2Internal standard container and unknown volume are big
The pressure differential deltap p of small tested container2, obtaining second of pressure difference change rate is Δ p2/Δt2；
Step 7: obtaining the volume V of the tested container of unknown volume size2；
(1) the first time pressure difference change rate got in step 5 is updated to gas leakage flow formulaIn,
Calculate first time gas leakage flow Q1, calculating formula is specific as follows:
(2) second of the pressure difference change rate got in step 6 is updated to gas leakage flow formulaIn,
Calculate second of gas leakage flow Q2, calculating formula is specific as follows:
(3) in the identical situation of tested container air pressure inside, by above-mentioned steps (1) and (2) obtained leakage flow
Q1、Q2The two is equal, i.e. Q1=Q2, therefore by formula (b) and the available following equation (d) of formula (c):
(4) equation (d) according to obtained in step (3), further derives the appearance of the tested container of unknown volume size
Product V2, calculating formula is specific as follows:
Step 8: by the volume V of the tested container acquired in step 72And known additional reservoir volume V1With it is known
Atmospheric pressure p0, it is updated in formula, calculates the gas leakage in the case of volume size of prior unknown tested container
Flow Q, calculating formula are specific as follows:
Step 9: exhaust terminates detection；
The second pneumatic operated valve, third pneumatic operated valve, the 4th pneumatic operated valve and the 5th pneumatic operated valve are opened, by the auxiliary of known volume size
Gas in the tested container of container, volumetric standard and unknown volume size after muffler noise reduction via being discharged.
Compared with prior art, the beneficial effects of the present invention are:
(1) differential pressure type air-tightness leakage detection apparatus provided by the invention between tested container and differential pressure pick-up by increasing
The impurity such as oil, water, dust in tested container are stopped by it in exhaust process, prevent its entrance by one check-valves
Inside leakage detection apparatus, reduce being stained for the core components such as sensor, so that the measurement of leakage detection apparatus be effectively guaranteed
Precision and service life；
(2) differential pressure type air-tightness leakage detection apparatus provided by the invention, by existing differential pressure type air-tightness leak detector gas
Increase the auxiliary volume of a known volume size in road, can realize can be used to detect tested container in known volume size
In the case of leakage flow, and can be used for detecting leakage flow of tested container in the case of unknown volume size；
(3) differential pressure type air-tightness leakage detection apparatus provided by the invention, have structure is simple, measuring accuracy is high, stability is good,
The advantages that use scope is wide；
(4) the leakage quantity measuring method of differential pressure type air-tightness leakage detection apparatus provided by the invention has easy to operate, measurement
The advantages that precision is high.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of existing differential pressure type air-tightness leak detector；
Fig. 2 is the structural schematic diagram of improved differential pressure type air-tightness leak detector on the basis of Fig. 1；
Fig. 3 is a kind of structural schematic diagram of preference of differential pressure type air-tightness leakage detection apparatus of the present invention；
Fig. 4 is that under the volume situation of known tested container, gas flow when inflation is illustrated for preference of the present invention in Fig. 3
Figure；
Fig. 5 is that under the volume situation of known tested container, gas flow when exhaust is illustrated for preference of the present invention in Fig. 3
Figure；
Fig. 6 is that under the volume situation of unknown tested container, gas flow when inflation is illustrated for preference of the present invention in Fig. 3
Figure；
Fig. 7 is that under the volume situation of unknown tested container, gas flow when exhaust is illustrated for preference of the present invention in Fig. 3
Figure；
Fig. 8 is the verifying for verifying the measurement result validity and accuracy of differential pressure type air-tightness leak detector provided by the invention
The preference of mechanism；
Fig. 9 is the differential pressure curve figure measured under Fig. 8 certifying organization；
Fig. 1 description of symbols into Fig. 2: 1, intake and exhaust control valve；2, the first valve；3, the second valve；4, third valve
Door；5, the 4th valve；6, the 5th valve；7, the 6th valve；8, benchmark container；9, tested container；10, differential pressure pick-up；
Fig. 3 description of symbols into Fig. 7: 1, gas source；2, pressure regulator valve；3, the first pneumatic operated valve；4, the second pneumatic operated valve；5,
Three pneumatic operated valves；6, the 4th pneumatic operated valve；7, the 5th pneumatic operated valve；8, barometer；9, differential pressure pick-up；10, volumetric standard；11, it is tested
Container；12, muffler；13, additional reservoir；14, check-valves；15, the first tracheae；16, the second tracheae；17, third tracheae；18,
4th tracheae；19, the 5th tracheae；20, the 6th tracheae；21, the 7th tracheae；22, the 8th tracheae；23, the 9th tracheae；24, the tenth
Tracheae；25, the 11st tracheae；26, the 12nd tracheae；
Description of symbols in Fig. 8: 100, flowmeter；200, metering valve；
Abscissa indicates time (S) in Fig. 9, and ordinate indicates pressure difference (Pa), and a nethermost curve indicates for the first time
Measurement result curve (fine line), intermediate curve second of measurement result curve (choice refreshments setting-out) of expression, uppermost one
Curve indicates third time measurement result curve (dotted line).
Specific embodiment
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below with reference to
The drawings and specific embodiments, how the present invention is further explained implements.
Differential pressure type air-tightness leakage detection apparatus provided by the invention, primarily directed to existing differential pressure such as shown in fig. 1 or fig. 2
Formula air-tightness leak detector can not detect changing for the defect proposition of leakage flow under the volume situation of unknown tested container 11
Into scheme, hold particular by the auxiliary in gas circuit such as shown in fig. 1 or fig. 2, increasing a upper known volume size
Device 13 both can be used for come what is improved by improved differential pressure type air-tightness leakage detection apparatus of the present invention in practical applications
Under 11 volume known cases of tested container leakage flow detection, and can be used for 11 volume of tested container in unknown situation
Under leakage flow detection.
In existing differential pressure type air-tightness leak detector as shown in the figures 1 and 2, if there are gas leakages for tested container therein 9
When, during the test, gas pressure change Δ p can be measured within the Δ t time by differential pressure pick-up 10, then by ideal
Equation of gas state pV=nRT, wherein p is gas pressure, and V is gas volume, and n is gaseous mass, and R is ideal gas constant, T
For the thermodynamic temperature of perfect gas, the specific leakage flow of tested container 9 can be calculated, specific as follows:
Assuming that starting air pressure is p in tested container 91, end air pressure is p2, leaked gas volume is Δ V in gas circuit, is held
In device and the outer gas temperature of container is T0, the volume of tested container 11 is V2(known), atmospheric pressure p0, according to the conservation of mass,
Available following formula:
According to above-mentioned formula, it can derive and have leaked gas volume delta V in differential pressure type air-tightness leak detector gas circuit are as follows:
According to leakage flow calculation formulaIt can be obtained in existing differential pressure type air-tightness leak detector gas circuit and be tested
The leakage flow Q at 9 end of container are as follows:
According to above-mentioned existing differential pressure type air-tightness leak detector, the leakage flow Q measured under the volume of known tested container
Method, the present invention provides not only a kind of new differential pressure type air-tightness leakage detection apparatus, while airtight also directed to existing differential pressure type
Property leak detector shortcoming, based on differential pressure type air-tightness leakage detection apparatus provided by the invention propose known to tested container
Gas leakage flow detection method under volume size and unknown volume size both situations.
As shown in fig.3, being a kind of preference of differential pressure type air-tightness leakage detection apparatus provided by the invention: in this preference
In, which includes that gas source 1, pressure regulator valve 2, the first pneumatic operated valve 3, the second pneumatic operated valve 4, third are pneumatic
Valve 5, the 4th pneumatic operated valve 6, differential pressure pick-up 9, volumetric standard 10 and tested container 11；
Wherein, gas source 1 is connect by the first tracheae 15 with the air inlet of pressure regulator valve 2, and the gas outlet of pressure regulator valve 2 passes through second
Tracheae 16 is connect with the air inlet of the first pneumatic operated valve 3, the gas outlet of the first pneumatic operated valve 3 by third tracheae 17 respectively with the 4th gas
One end of pipe 18 and the connection of one end of the 6th tracheae 20, the other end of the 4th tracheae 18 are connect with the air inlet of the second pneumatic operated valve 4,
The other end of 6th tracheae 20 is connect with one end of the 7th tracheae 21, the other end of the 7th tracheae 21 and third pneumatic operated valve 5 into
Port connection；The gas outlet of second pneumatic operated valve 4 passes through the 5th tracheae 19 one end with volumetric standard 10 and differential pressure pick-up 9 respectively
Connection；The gas outlet of third pneumatic operated valve 5 is connected with the other end of tested container 11 and differential pressure pick-up 9 respectively by the 8th tracheae 22
It connects；
To achieve the purpose of the present invention i.e.: can be not only used for leakage of detection tested container in the case of known volume
Flow, and can be used for detecting leakage flow of tested container in the case of unknown volume.It, should therefore in preference of the present invention
Differential pressure type air-tightness leakage detection apparatus, also includes the 5th pneumatic operated valve 7 and additional reservoir 13, and the air inlet of the 5th pneumatic operated valve 7 passes through
11st tracheae 25 connect respectively with the 6th tracheae 20 far from one end of third tracheae 17 and the 4th tracheae 18 and with the 7th gas
Pipe 21 is connected far from one end of third pneumatic operated valve 5, and the gas outlet of the 5th pneumatic operated valve 7 passes through the 12nd tracheae 26 and additional reservoir 13
Connection；
Tested container 11 therein is the container of a known volume size or unknown volume size；Additional reservoir 13 is one
The volumetric standard of a known volume size；As for volumetric standard 10 therein volume whether it is known that do not work to the present invention,
Therefore it does not emphasize.
In preference of the present invention, to prevent foreign matter from entering the inside that device measures gas circuit, and then measurement gas is damaged
Core instrument in road: one is additionally provided on the gas outlet of connection third pneumatic operated valve 5 and the 8th tracheae 22 of tested container 11
Check-valves 14, the air inlet of the check-valves 14 are connect with one end of the gas outlet of third pneumatic operated valve 5 and differential pressure pick-up 8 respectively,
The gas outlet of check-valves 14 is connect with tested container 11.
In preference of the present invention, to eliminate the noise generated in gas discharge process: in going out for connection third pneumatic operated valve 5
The 9th tracheae 23 is also connected on 8th tracheae 22 of port and tested container 11,23 one end of the 9th tracheae passes through the 8th
Tracheae 22 is connect with the gas outlet of check-valves 14 and tested container 11 respectively, 23 other end of the 9th tracheae and the 4th pneumatic operated valve 6
The gas outlet of air inlet connection, the 4th pneumatic operated valve 6 is connect by the tenth tracheae 24 with muffler 12.
In preference of the present invention, in order to accurately grasp the air pressure change situation in measuring device: the difference in real time
Pressure type air-tightness leakage detection apparatus also includes barometer 8, which can be set on the 6th tracheae 20, also be can be set
In the connecting portion of the 6th tracheae 20 and third tracheae 17 and the 4th tracheae 18.
As shown in Figure 4 and Figure 5, the differential pressure type air-tightness leakage detection apparatus provided for preference of the present invention, in known tested appearance
In the case where 11 volume size of device, the process of charge, exhaust when gas leakage flow detection is carried out: where arrow shown in Fig. 4
Head is directed toward, and expression is the gas stream when leakage detection apparatus is inflated herein in the case of the volume size of known tested container 11
To；Arrow shown in Fig. 5 is directed toward, and expression is leak detection dress herein in the case of the volume size of known tested container 11
Set gas flow when exhaust.
(1) when the differential pressure type air-tightness leakage detection apparatus provided using preference of the present invention, in known 11 volume of tested container
In the case where size, when carrying out gas leakage flow detection, gas leakage flow detection method is specifically included the following steps:
Step 1: closing the 5th pneumatic operated valve 7；
Step 2: the tested container 11 of volumetric standard 10 and known volume size is inflated；
The first pneumatic operated valve 3, the second pneumatic operated valve 4, third pneumatic operated valve 5 are opened, the 4th pneumatic operated valve 6 is closed, connects gas source 1, by
Gas source 1 is inflated to the tested container 11 of volumetric standard 10, known volume size；
Step 3: the air pressure in volumetric standard 10 and the tested container of known volume size 11 being allowed to reach balance for the first time；
By the air pressure size in 8 real-time detection gas circuit of barometer, when barometer 8 detects that the gas pressure in gas circuit reaches
To after the preset pressure value of system, the first pneumatic operated valve 3, the tested container to volumetric standard 10 and known volume size are closed
Air pressure in 11 reaches to be balanced for the first time；
Step 4: the air pressure in volumetric standard 10 and the tested container of known volume size 11 being allowed to reach second of balance；
The second pneumatic operated valve 4 and third pneumatic operated valve 5 are closed, in volumetric standard 10 and the tested container of known volume size 11
Air pressure reach second of balance；
Step 5: obtaining pressure difference change rate, calculate leakage flow；
(1) known if the tested container 11 of known volume size is there are when gas leakage after being balanced to second
Air pressure in the tested container 11 of volume size can constantly decline, and can detect a period of time Δ t by differential pressure pick-up 9 at this time
The pressure difference changes delta p of interior volumetric standard 10 and tested container 11, the pressure difference change rate to obtain gas circuit is Δ p/ Δ t according to this；
(2) the volume V of tested container 11 is obtained2And the pressure difference change rate Δ p/ Δ t in gas circuit, it is counted by formula (a)
Calculate the leakage flow Q of the tested container 11 of known volume size；
In formula: V2Indicate the volume of tested container；
p0Indicate atmospheric pressure；
Step 6: exhaust terminates detection；
Open the second pneumatic operated valve 4, third pneumatic operated valve 5 and the 4th pneumatic operated valve 6, by volumetric standard 10, known volume it is tested
Gas in container 11 after 12 noise reduction of muffler via being discharged.
As shown in Figure 6 and Figure 7, the differential pressure type air-tightness leakage detection apparatus provided for preference of the present invention, in unknown tested appearance
In the case where 11 volume size of device, the process of charge, exhaust when gas leakage flow detection is carried out: where arrow shown in Fig. 6
Head is directed toward, and expression is gas stream herein in the case of the volume size of unknown tested container 11, when which inflates
To；Arrow shown in fig. 7 is directed toward, and expression is leak detection dress herein in the case of the volume size of unknown tested container 11
Set gas flow when exhaust.
(2) when the differential pressure type air-tightness leakage detection apparatus provided using preference of the present invention, in unknown 11 volume of tested container
In the case where size, when carrying out gas leakage flow detection, gas leakage flow detection method is specifically included the following steps:
Step 1: opening the 5th pneumatic operated valve 7；
Step 2: the additional reservoir 13 of tested container 11 and known volume size to volumetric standard 10, unknown volume size
Inflation；
The first pneumatic operated valve 3, the second pneumatic operated valve 4, third pneumatic operated valve 5 are opened, the 4th pneumatic operated valve 6 is closed, connects gas source 1, by
Gas source 1 is inflated to the additional reservoir 13 of volumetric standard 10, the tested container 11 of unknown volume size and known volume size；
Step 3: allowing the additional reservoir 13 of volumetric standard 10, the tested container 11 of unknown volume size and known volume size
Interior air pressure reaches to be balanced for the first time；
By the air pressure size in 8 real-time detection gas circuit of barometer, when barometer 8 detects that the gas pressure in gas circuit reaches
To after the preset pressure value of system, the first pneumatic operated valve 3 is closed, to volumetric standard 10, the tested container of unknown volume size
11 and known volume size additional reservoir 13 in air pressure progressively reach for the first time balance；
Step 4: allowing the tested container 11 of 10 unknown volume size of volumetric standard and the additional reservoir 13 of known volume size
Air pressure reach second of balance；
The second pneumatic operated valve 4 is closed, to volumetric standard 10, the tested container 11 of unknown volume size and known volume size
Air pressure in additional reservoir 13 reaches second of balance；
Step 5: measurement first time pressure difference change rate；
After being balanced to second, if there is leakage, known volume size in the tested container 11 of unknown volume size
Additional reservoir 13 and unknown volume size tested container 11 in air pressure can constantly decline, at this time pass through differential pressure pick-up 9
To measure a period of time Δ t1The pressure differential deltap p of internal standard container 10 and the tested container of unknown volume 111, obtain first time pressure difference
Change rate is Δ p1/Δt1；
Step 6: second of pressure difference change rate of measurement；
Third pneumatic operated valve 5 is closed, a period of time Δ t is measured by differential pressure pick-up 92Internal standard container 10 and unknown appearance
The pressure differential deltap p of the tested container 11 of product size2, obtaining second of pressure difference change rate is Δ p2/Δt2；
Step 7: obtaining the volume V of the tested container 11 of unknown volume size2；
(1) the first time pressure difference change rate got in step 5 is updated to gas leakage flow formulaIn,
Calculate first time gas leakage flow Q1, calculating formula is specific as follows:
(2) second of the pressure difference change rate got in step 6 is updated to gas leakage flow formulaIn,
Calculate second of gas leakage flow Q2, calculating formula is specific as follows:
(3) in the identical situation of tested container air pressure inside, by above-mentioned steps (1) and (2) obtained leakage flow
Q1、Q2The two is equal, i.e. Q1=Q2, therefore by formula (b) and the available following equation (d) of formula (c):
(4) equation (d) according to obtained in step (3) further derives the tested container 11 of unknown volume size
Volume V2, calculating formula is specific as follows:
Step 8: by the volume V of the tested container 11 acquired in step 72And known 13 volume V of additional reservoir1?
The atmospheric pressure p known0, it is updated in formula (c), calculates in the case of the volume size of prior unknown tested container 11
Gas leakage flow Q, calculating formula are specific as follows:
Step 9: exhaust terminates detection；
The second pneumatic operated valve 4, third pneumatic operated valve 5, the 4th pneumatic operated valve 6 and the 5th pneumatic operated valve 7 are opened, by known volume size
Gas in the tested container 11 of additional reservoir 13, volumetric standard 10 and unknown volume size is via 12 noise reduction heel row of muffler
Out.
As shown in figure 8, devising a set of certifying organization in order to verify effectiveness of the invention and accuracy: sending out this
11 output end of tested container in the differential pressure type air-tightness leakage detection apparatus of bright offer connects a upper flowmeter 100 and a metering
Valve 200 controls leakage rate by adjusting metering valve 200, current leakage rate size is shown by flowmeter 100.
When measurement: the design pressure of gas source 1 is 400kPa (practical application is within the scope of 400~800kPa), by pressure regulation
The air pressure that valve 2 outputs it gas is depressurized to 200kPa, and specifically testing pressure certainly according to actual needs, in device can lead to
Overregulate pressure regulator valve 2 to realize, wherein the volume V of the additional reservoir 13 of known volume size2For 0.14L.
Below by metering valve 200 is adjusted, test is tested three times respectively:
A, it tests for the first time: adjusting metering valve 200, the leakage rate measured is 5.9ml/min；Test result curve such as Fig. 9
Shown in first time test curve.
In this test: Δ t1=28-10=18 (s), Δ p1=544.2-59.8=484.4 (Pa)；Δt2=58-
35=18 (s), Δ p2=1794.4-789.2=1005.2 (Pa)；According to V2Leakage stream is calculated by formula (f) in=0.14L
It measures Q=5.82 (ml/min).
Under equal conditions, by by above-mentioned certifying organization after first time tests obtained leakage rate 5.9ml/min and logical
It crosses the obtained leakage rate 5.82ml/min of leakage quantity measuring method provided by the invention to compare, it is known that the measurement of the two is opposite accidentally
Difference is 1.35%.
B, it tests for second: adjusting metering valve 200, the leakage rate measured is 7.6ml/min；Test result curve such as Fig. 9
Shown in second of test curve.
In this test: Δ t1=28.7-8=20.7 (s), Δ p1=808.8-75.2=733.6 (Pa)；Δt2=
58.7-36.5=22.2 (s), Δ p2=2501.4-1202.2=1299.2 (Pa)；According to V2=0.14L is calculated by formula (f)
Obtain leakage flow Q=7.47 (ml/min).
Under equal conditions, the leakage rate 7.6ml/min that is obtained after being tested by above-mentioned certifying organization second and logical
It crosses the obtained leakage rate 7.47ml/min of leakage quantity measuring method provided by the invention to compare, it is known that the measurement of the two is opposite accidentally
Difference is 1.7%.
C, third time is tested: adjusting metering valve 200, the leakage rate measured is 10.4ml/min；Test result curve such as Fig. 9
Shown in third time test curve.
In this test: Δ t1=28.7-10=18.7 (s), Δ p1=1220.4-290.8=929.6 (Pa)；Δt2
=58.7-37.9=20.8 (s)；Δp2=3629.8-1914.8=1715 (Pa)；According to V2=0.14L is calculated by formula (f)
Obtain leakage flow Q=10.41 (ml/min).
Under equal conditions, by by above-mentioned certifying organization after third time is tested obtained leakage rate 10.4ml/min and logical
It crosses the obtained leakage rate 10.41ml/min of leakage quantity measuring method provided by the invention to compare, it is known that the measurement of the two is opposite
Error is 0.1%.
By the relative error of measurement three times obtained above it is found that using differential pressure type air-tightness leakage detection apparatus provided by the invention
And the obtained leakage flow of detection method measurement is substantially near tending to actual value, so, it can determine whether using provided by the invention
Differential pressure type air-tightness leakage detection apparatus can effectively and correctly measure obtain no matter tested container is gone back under known volume situation
It is the leakage flow under unknown volume situation.
Finally illustrate, the above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all
Using equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is applied directly or indirectly in other
Relevant technical field, is included within the scope of the present invention.
Claims (6)
1. a kind of differential pressure type air-tightness leakage detection apparatus includes gas source (1), pressure regulator valve (2), the first pneumatic operated valve (3), the second pneumatic operated valve
(4), third pneumatic operated valve (5), the 4th pneumatic operated valve (6), differential pressure pick-up (9), volumetric standard (10) and tested container (11)；It is described
Gas source (1) is connect by the first tracheae (15) with the air inlet of the pressure regulator valve (2), and the gas outlet of the pressure regulator valve (2) passes through
Second tracheae (16) is connect with the air inlet of first pneumatic operated valve (3), and the gas outlet of first pneumatic operated valve (3) passes through third
Tracheae (17) is connect with one end of one end of the 4th tracheae (18) and the 6th tracheae (20) respectively, the 4th tracheae (18) it is another
One end is connect with the air inlet of the second pneumatic operated valve (4), the other end of the 6th tracheae (20) and one end of the 7th tracheae (21)
Connection, the other end of the 7th tracheae (21) are connect with the air inlet of third pneumatic operated valve (5), second pneumatic operated valve (4)
Gas outlet is connect with one end of volumetric standard (10) and differential pressure pick-up (9) respectively by the 5th tracheae (19)；The third gas
The gas outlet of dynamic valve (5) is connect with the other end of tested container (11) and differential pressure pick-up (9) respectively by the 8th tracheae (22)；
It also include the 5th pneumatic operated valve (7) and additional reservoir (13) it is characterized by: the differential pressure type air-tightness leakage detection apparatus,
The air inlet of 5th pneumatic operated valve (7) is by the 11st tracheae (25) respectively with the 6th tracheae (20) far from third tracheae
(17) it connects and connects with the 7th tracheae (21) far from the one end of third pneumatic operated valve (5) with one end of the 4th tracheae (18)
It connects, the gas outlet of the 5th pneumatic operated valve (7) is connect by the 12nd tracheae (26) with the additional reservoir (13)；
The tested container (11) is the container of a known volume size or unknown volume size；
The additional reservoir (13) is the volumetric standard of a known volume size.
2. differential pressure type air-tightness leakage detection apparatus according to claim 1, it is characterised in that: connecting the third pneumatic operated valve
(5) check-valves (14), the check-valves (14) are additionally provided on the 8th tracheae (22) of gas outlet and tested container (11)
Air inlet connect respectively with one end of the gas outlet of the third pneumatic operated valve (5) and the differential pressure pick-up (9), the non-return
The gas outlet of valve (14) is connect with the tested container (11).
3. differential pressure type air-tightness leakage detection apparatus according to claim 2, it is characterised in that: connecting the third pneumatic operated valve
(5) the 9th tracheae (23), the 9th gas are also connected on the 8th tracheae (22) of gas outlet and tested container (11)
Pipe (23) one end is connect with the gas outlet of the check-valves (14) and tested container (11) respectively by the 8th tracheae (22), described
9th tracheae (23) other end is connect with the air inlet of the 4th pneumatic operated valve (6), and the gas outlet of the 4th pneumatic operated valve (6) passes through the
Ten tracheaes (24) are connect with muffler (12).
4. differential pressure type air-tightness leakage detection apparatus according to any one of claims 1 to 3, it is characterised in that: the differential pressure type
Air-tightness leakage detection apparatus also includes barometer (8), and the barometer (8) is arranged on the 6th tracheae (20) or the 6th gas
Manage the connecting portion of (20) and third tracheae (17) and the 4th tracheae (18).
5. it is a kind of using differential pressure type air-tightness leakage detection apparatus as claimed in claim 4 in known tested container (11) volume size feelings
The detection method of leakage flow under condition, it is characterised in that: comprise the following steps:
Step 1: closing the 5th pneumatic operated valve (7)；
Step 2: the tested container (11) of volumetric standard (10) and known volume size is inflated；
The first pneumatic operated valve (3), the second pneumatic operated valve (4), third pneumatic operated valve (5) are opened, the 4th pneumatic operated valve (6) is closed, connects gas source
(1), the tested container (11) by gas source (1) to volumetric standard (10), known volume size is inflated；
Step 3: the air pressure in volumetric standard (10) and the tested container (11) of known volume size being allowed to reach balance for the first time；
By the air pressure size in barometer (8) real-time detection gas circuit, when barometer (8) detects that the gas pressure in gas circuit reaches
It to after the preset pressure value of system, closes the first pneumatic operated valve (3), to being tested for volumetric standard (10) and known volume size
Air pressure in container (11) reaches to be balanced for the first time；
Step 4: the air pressure in volumetric standard (10) and the tested container (11) of known volume size being allowed to reach second of balance；
Close the second pneumatic operated valve (4) and third pneumatic operated valve (5), the tested container to volumetric standard (10) and known volume size
(11) air pressure in reaches second of balance；
Step 5: obtaining pressure difference change rate, calculate leakage flow；
(1) known to hold if the tested container (11) of known volume size is there are when gas leakage after being balanced to second
Air pressure in the tested container (11) of product size can constantly decline, and can detect a period of time by differential pressure pick-up (9) at this time
The pressure difference changes delta p of volumetric standard (10) and tested container (11) in Δ t, the pressure difference change rate to obtain gas circuit is Δ according to this
p/Δt；
(2) according to the volume V of tested container (11)2And the pressure difference change rate Δ p/ Δ t in gas circuit, it is calculated by formula (a)
The leakage flow Q of the tested container (11) of known volume size out；
In formula: V2Indicate the volume of tested container；
p0Indicate atmospheric pressure；
Step 6: exhaust terminates detection；
The second pneumatic operated valve (4), third pneumatic operated valve (5) and the 4th pneumatic operated valve (6) are opened, by volumetric standard (10), known volume
Gas in tested container (11) after muffler (12) noise reduction via being discharged.
6. it is a kind of using differential pressure type air-tightness leakage detection apparatus as claimed in claim 4 in unknown tested container (11) volume size feelings
The detection method of leakage flow under condition, it is characterised in that: comprise the following steps:
Step 1: opening the 5th pneumatic operated valve (7)；
Step 2: to volumetric standard (10), the tested container (11) of unknown volume size and the additional reservoir of known volume size
(13) it inflates；
The first pneumatic operated valve (3), the second pneumatic operated valve (4), third pneumatic operated valve (5) are opened, the 4th pneumatic operated valve (6) is closed, connects gas source
(1), the auxiliary by gas source (1) to volumetric standard (10), the tested container (11) of unknown volume size and known volume size is held
Device (13) inflation；
Step 3: allowing volumetric standard (10), the tested container (11) of unknown volume size and the additional reservoir of known volume size
(13) air pressure in reaches to be balanced for the first time；
By the air pressure size in barometer (8) real-time detection gas circuit, when barometer (8) detects that the gas pressure in gas circuit reaches
To after the preset pressure value of system, close the first pneumatic operated valve (3), to volumetric standard (10), unknown volume size it is tested
Air pressure in container (11) and the additional reservoir (13) of known volume size progressively reaches to be balanced for the first time；
Step 4: allowing volumetric standard (10), the tested container (11) of unknown volume size and the additional reservoir of known volume size
(13) air pressure reaches second of balance；
The second pneumatic operated valve (4) are closed, to volumetric standard (10), the tested container (11) of unknown volume size and known volume size
Additional reservoir (13) in air pressure reach second of balance；
Step 5: measurement first time pressure difference change rate；
After being balanced to second, if there is leakage in the tested container (11) of unknown volume size, known volume size
Air pressure in additional reservoir (13) and the tested container (11) of unknown volume size can constantly decline, and pass through differential pressure pick-up at this time
(9) a period of time Δ t is measured1The pressure differential deltap p of internal standard container (10) and the tested container (11) of unknown volume1, obtain first
Secondary pressure difference change rate is Δ p1/Δt1；
Step 6: second of pressure difference change rate of measurement；
It closes third pneumatic operated valve (5), a period of time Δ t is measured by differential pressure pick-up (9)2Internal standard container (10) and unknown
The pressure differential deltap p of the tested container (11) of volume size2, obtaining second of pressure difference change rate is Δ p2/Δt2；
Step 7: obtaining the volume V of the tested container (11) of unknown volume size2；
(1) the first time pressure difference change rate that will be got in step 5, is updated to gas leakage flow formulaIn, it obtains
First time gas leakage flow Q1, calculating formula is specific as follows:
(2) second of the pressure difference change rate got in step 6 is updated to gas leakage flow formulaIn, it obtains
Second of gas leakage flow Q2, calculating formula is specific as follows:
(3) in the identical situation of tested container air pressure inside, by above-mentioned steps (1) and (2) obtained leakage flow Q1、Q2
The two is equal, i.e. Q1=Q2, therefore by formula (b) and the available following equation (d) of formula (c):
(4) equation (d) according to obtained in step (3) further derives the appearance of the tested container (11) of unknown volume size
Product V2, calculating formula is specific as follows:
Step 8: by the volume V of the tested container acquired in step 7 (11)2And known additional reservoir (13) volume V1?
The atmospheric pressure p known0, it is updated in formula (c), calculates in the case of the volume size of prior unknown tested container (11)
Gas leakage flow Q, calculating formula is specific as follows:
Step 9: exhaust terminates detection；
The second pneumatic operated valve (4), third pneumatic operated valve (5), the 4th pneumatic operated valve (6) and the 5th pneumatic operated valve (7) are opened, known volume is big
Gas in the tested container (11) of small additional reservoir (13), volumetric standard (10) and unknown volume size is via muffler
(12) it is discharged after noise reduction.
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| CN110182707A (en) * | 2019-04-26 | 2019-08-30 | 南京航空航天大学 | A kind of Pneumatic balance crane and control method using differential pressure pickup |
| CN110118636A (en) * | 2019-05-21 | 2019-08-13 | 佛山市爱森宝机电设备有限公司 | The airtight testboard of airbed electric air pump |
| CN110081944A (en) * | 2019-06-05 | 2019-08-02 | 浙江埃泰克环境科技有限公司 | A kind of gas measuring method and equipment therefor based on real-time pressure variation |
| CN110307951A (en) * | 2019-07-25 | 2019-10-08 | 浙江银轮机械股份有限公司 | Dry type leakage detecting apparatus and dry type leak hunting method |
| CN112834136A (en) * | 2020-12-30 | 2021-05-25 | 武汉智迅创源科技发展股份有限公司 | Method for detecting leakage and blockage of finished precision infusion apparatus by using differential pressure gas path |
| CN113567071A (en) * | 2021-07-26 | 2021-10-29 | 湖南正中制药机械有限公司 | Rapid vacuum leak detection system and method |
| CN113933467B (en) * | 2021-10-26 | 2024-02-13 | 国网浙江省电力有限公司电力科学研究院 | Sulfur hexafluoride decomposition product air pressure monitoring device based on gas in-situ detection |
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| DE10242491B8 (en) * | 2001-09-13 | 2010-02-11 | Consens Gmbh | Method and device for testing low leakage rates |
| CN1779428A (en) * | 2004-11-25 | 2006-05-31 | 博益(天津)气动技术研究所有限公司 | Airtight sniffer for computing pressuring, balancing, inspecting and discharging time automatically |
| FR2894026A3 (en) * | 2005-11-30 | 2007-06-01 | Renault Sas | Enclosure e.g. gear box case, sealing control device for vehicle, has suction system maintaining enclosure at threshold pressure, and flowmeter that measures quantity of air aspirated per time unit for calculating leakage flow |
| CN201028987Y (en) * | 2007-02-09 | 2008-02-27 | 北京拓奇星自动化技术有限公司 | 10Mpa differential pressure type gas leakage detecting device |
| EP2238424B1 (en) * | 2007-11-21 | 2018-10-10 | Structural Monitoring Systems Ltd | Differential comparative pressure monitoring system |
| CN101458148B (en) * | 2008-12-31 | 2010-08-11 | 浙江工业大学 | High precision gas leakage working position separating detection device |
| CN102087159B (en) * | 2009-12-08 | 2012-07-25 | 北京卫星环境工程研究所 | Differential pressure leakage detecting method for double primary standards |
| CN203024944U (en) * | 2012-11-27 | 2013-06-26 | 天津俞昌科技有限公司 | High-precision differential pressure type air tightness leak detector |
| CN104215290B (en) * | 2014-09-12 | 2017-08-25 | 天津博益气动股份有限公司 | Differential pressure type volume measurement method |
| CN107991033A (en) * | 2017-12-20 | 2018-05-04 | 西安航天计量测试研究所 | Total pressure minute leakage precision measurement system |
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