CN104215290B - Differential pressure type volume measurement method - Google Patents
Differential pressure type volume measurement method Download PDFInfo
- Publication number
- CN104215290B CN104215290B CN201410466492.3A CN201410466492A CN104215290B CN 104215290 B CN104215290 B CN 104215290B CN 201410466492 A CN201410466492 A CN 201410466492A CN 104215290 B CN104215290 B CN 104215290B
- Authority
- CN
- China
- Prior art keywords
- leak
- differential pressure
- control unit
- pipeline
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The present invention provides differential pressure type volume measurement method, it includes a leak detection unit, referance leak group and control unit, the leak detection unit includes an air inlet pipeline, tested pipeline, benchmark pipeline and differential pressure pick-up, detection method includes tested pipeline and the not connected end of benchmark pipeline is respectively communicated with measured object and primary standard substance, and the air inlet pipeline is connected with source of the gas；Second step, the switch valve corresponding to the referance leak of the minimum leak rate of control unit control is opened；3rd step, control unit controls two balanced valves to open, and controls Air inflating and exhausting valve to open, and thus switches to after gas fill port and starts to be inflated measured object (13) and primary standard substance.This patent can be with the high-precision volumetric values for detecting different size, and gas circuit, which is connected, allows for Small leak, and measured object during detection volume can be the workpiece of common Small leak；Detection method produced by coordinating the device simultaneously effectively can improve its detection rates and effect using this device.
Description
Technical field
The invention belongs to measure volume field, more particularly, to a kind of differential pressure type volume measurement method.
Background technology
At present, in the volume measurement method of the airtight leak detector of differential pressure type, one of which is referance leak deflation method, is surveyed first
Pressure testing PTAfter inflation and balance, pressure drop (differential pressure) the Δ P produced in detection time Δ T is measured, The Ideal-Gas Equation is usedThe volume size of measured object can be calculated.
But, it can be limited in actual use due to the level of operating personnel, there may be small for the gas circuit of connection
The leakage that can not but ignore, influence volume measurement precision；Meanwhile, measured object used in detection volume must also be accomplished to let out
Leakage is small to the degree that can ignore, and otherwise can produce influence to accuracy of detection as gas-path leakage.On the other hand, due to existing
Only built-in 1 referance leak of the airtight leak detector of differential pressure type of volume measurement, the scope of its volume measurement is limited by referance leak
System, if detection volume is big relative to referance leak, the pressure drop Δ P of generation is smaller, so as to influence accuracy of detection, still
If detection volume is relatively small, the pressure drop Δ P of generation easily exceeds the detection range of differential pressure pick-up, causes not measuring this
Volume.If again in other words using referance leak externally positioned type when, it is necessary to operating personnel according to the estimation volume of measured object select
Suitable small opening access gas circuit is detected, accuracy of detection can be also influenceed if selection is improper, so to operating personnel
Technical merit have certain requirement.
So, it is now desired to develop a kind of volume measurement and have a wide reach and ensure high accuracy, while can be with maximum journey
Degree is ignored other reasonses and produces the differential pressure type device for measuring volume of error and the detection side of volume measurement is carried out using the device
The proposition of method is urgent problem to be solved.
The content of the invention
The problem to be solved in the present invention is to provide a kind of high accuracy and can detect the differential pressure type volume measurement of many specification volumes
Device.
In order to solve the above technical problems, the technical solution adopted by the present invention is：Differential pressure type device for measuring volume, it includes one
Leak detection unit, referance leak group and control unit, the leak detection unit include an air inlet pipeline, tested pipeline,
Benchmark pipeline and differential pressure pick-up, the air inlet pipeline are connected respectively by the two ends of a valve body group and differential pressure pick-up, and its
One end also with tested pipeline connection, the other end and benchmark pipeline connection；
The referance leak group includes the referance leak of several different leak rates, and each referance leak can be opened with tested pipeline
Close connection；
Described control unit is electrically connected with valve body group, differential pressure pick-up and referance leak group respectively.
Further, the air inlet pipeline is also connected with a pressure sensor, and the pressure sensor is electrically connected with control unit.
Further, the valve body group includes the Air inflating and exhausting valve and balanced valve of a two-bit triplet, the Air inflating and exhausting valve
Air inlet is connected with air inlet pipeline, and its gas outlet is connected by balanced valve respectively with tested pipeline and benchmark pipeline, described to fill row
Air valve and balanced valve are electrically connected with control unit.
Further, the Air inflating and exhausting valve is two-bit triplet valve body, and the balanced valve is 2/2-way valve body.
Further, the referance leak is by a switch valve and tested pipeline connection, the switch valve and control unit
Electrical connection.
Further, control unit includes control unit and the display screen being connected with its signal.
In addition, providing one kind to coordinate with it and efficiently quickly enter according to the above-mentioned differential pressure type device for measuring volume being previously mentioned
The detection method of row volume measurement.
The detection method for carrying out volume measurement using said apparatus is as follows：
The first step, the not connected end of tested pipeline and benchmark pipeline is respectively communicated with measured object and primary standard substance, the air inlet
Pipeline is connected with source of the gas；
Second step, the switch valve corresponding to the referance leak of the minimum leak rate of control unit control is opened；
3rd step, control Air inflating and exhausting valve and two balanced valves are opened, and control Air inflating and exhausting valve to open, and are thus switched to and are filled
Start to be inflated measured object and primary standard substance after gas path；
4th step, control unit control balanced valve is closed, by presetting balance and the time link of detection, in detection
Differential pressure pick-up detects the differential pressure produced in the case where opening Current standards small opening in time, and passes to control unit by electric signal
Record；
5th step, control unit control balanced valve is opened, and closes the air inlet of Air inflating and exhausting valve, thus switches to exhaust logical
Road so that the gas in whole device is discharged by the gas outlet of Air inflating and exhausting valve；
Whether the 6th step, the differential pressure produced by control unit is detected reaches prescribed limit value, if model against regulation
Enclose value then to control current switch valve to close and open the corresponding switch valve of the slightly larger referance leak of next leak rate, return to the 3rd step
Restart following detecting step, until the referance leak that differential pressure meets prescribed limit value is found, if meeting regulation
Value range then carries out the 7th step；
The corresponding switch valve of all referance leaks is closed in 7th step, control, only repeatedly closes balanced valve after the 3rd step, then enter
The step of row the 8th；
8th step, differential pressure pick-up detected in identical detection time without the differential pressure under referance leak, and pass through
Electric signal passes to control unit record；
9th step, the volume numerical value of detection is shown by the display screen of controller.
Further, prescribed limit value is between 30%F.S. to the 70%F.S. of differential pressure pick-up measurement range.
Further, control unit preserves the pressure and leak rate curve of referance leak group, and work is detected by pressure sensor
Make the test pressure under state, and control unit passed to by signal to calculate the referance leak that current test pressure is currently connected
Leak rate.
Further, when the detection of the 6th step of control unit progress meets defined referance leak, for the company of referance leak
It is logical to be detected successively all in accordance with its leak rate.
The present invention has the advantages and positive effects of：Differential pressure type device for measuring volume can detect difference with high-precision
The volumetric values of specification, gas circuit is that pipeline connection allows for Small leak, and measured object during detection volume can be common
The workpiece of Small leak；Detection method produced by coordinating the device simultaneously effectively can improve its detection rates using this device
And effect.
Brief description of the drawings
Fig. 1 is the circuit of the present invention, gas circuit connection figure.
In figure：
1st, pressure sensor 2, control unit 3, Air inflating and exhausting valve
4th, the first balanced valve 5, the second balanced valve 6, differential pressure pick-up
7th, the first referance leak 8, first switch valve 9, the second referance leak
10th, second switch valve 11, the 3rd referance leak 12, the 3rd switch valve
13rd, measured object 14, primary standard substance 15, tested pipeline
16th, benchmark pipeline 17, air inlet pipeline
Dotted line represents circuit in figure, and solid line represents gas circuit.
Embodiment
The specific embodiment of the present invention is elaborated below in conjunction with the accompanying drawings.
As shown in figure 1, differential pressure type device for measuring volume, it includes a leak detection unit, referance leak group and control
Unit 2, the leak detection unit includes an air inlet pipeline 17, tested pipeline 15, benchmark pipeline 16 and differential pressure pick-up 6,
The air inlet pipeline 17 is connected respectively by a valve body group with the two ends of differential pressure pick-up 6, and its one end also connects with tested pipeline 15
Logical, the other end is connected with benchmark pipeline 16, Air inflating and exhausting valve 3 and 2/2-way of the valve body group including two-bit triplet
First balanced valve 4, the second balanced valve 5, the air inlet of the Air inflating and exhausting valve 3 are connected with air inlet pipeline 17, and its gas outlet is with being tested
Pipeline 15 and benchmark pipeline 16 are connected by the first balanced valve 4 and the second balanced valve 5 respectively, the Air inflating and exhausting valve 3 and balanced valve
4,5 electrically connect with control unit 2；
The referance leak group includes the first referance leak 7, the second referance leak 9, the 3rd standard of several different leak rates
Small opening 11, and each referance leak passes through first switch valve 8, second switch valve 10, the 3rd switch valve 12 and tested pipeline respectively
15 connections；
The air inlet pipeline 17 is also connected with a pressure sensor 1, and the pressure sensor 1 is electrically connected with control unit 2；
Described control unit 2 is electrically connected with switch valve 8,10,12, valve body group, differential pressure pick-up 6 and referance leak group respectively
Connect, and the control unit 2 includes control unit and the display screen being connected with its signal.
Its operation principle is exactly the volume that measured object 13 is detected with the airtight detector of differential pressure type, and the measured object 13 is connected
One end of tested pipeline 15 is connected on, and the other end of the tested pipeline 15 is connected with the first balanced valve 4, and it is used as measuring basis
Primary standard substance 14 is then connected to one end of benchmark pipeline 16, and the other end of the benchmark pipeline 16 connects the second balanced valve 5, and tested
Connected between pipeline 15 and benchmark pipeline 16 by a differential pressure pick-up 6.
And the detection method specifically using device progress volume measurement is as follows：
The first referance leak 7, the second referance leak 9, the leak rate Q of the 3rd referance leak 11 is set in embodiment successively to increase
Greatly；
And the pressure and leak rate curve of referance leak group are preserved in control unit 2, measuring current test pressure PT's
In the case of can calculate the leak rate Q of corresponding referance leak.
The first step, the not connected end of tested pipeline 15 and benchmark pipeline 16 is respectively communicated with measured object 13 and primary standard substance 14,
The air inlet pipeline 17 is connected with source of the gas, and opens pressure sensor 1, is detected by the pressure sensor 1 under working condition
Test pressure PT, and control unit 2 is transmitted to by electric signal, monitoring duty keeps setting pressure；
Setting for this pressure sensor 1 is exactly that can control working condition test pressure P as defined inT, so as to ensure measurement
Precision.
Second step, control unit 2 controls the switch valve corresponding to minimum leak rate Q referance leak to open, the as first mark
The corresponding first switch valve 8 of quasi- small opening 7 is opened, and accomplishes the connection of the first referance leak 7 and tested pipeline 15；
3rd step, control Air inflating and exhausting valve 3 and two balanced valves 4,5 are opened, and then control Air inflating and exhausting valve 3 is opened, from
And gas fill port is switched to, and start to be inflated measured object 13 and primary standard substance 14；
4th step, the control balanced valve 4,5 of control unit 2 is closed, and in presetting detection time △ T, differential pressure sensing 6
Recorded detecting opening the differential pressure A that the first referance leak 7 time produces and return to control unit 2 by electric signal；
5th step, the control balanced valve 4,5 of control unit 2 is opened, and closes the air inlet of Air inflating and exhausting valve 3, is thus switched to
Exhaust channel so that the gas in whole device is discharged by the gas outlet of Air inflating and exhausting valve 3；
Whether the 6th step, the differential pressure A produced by control unit 2 is detected reaches prescribed limit value, as differential pressure pick-up 6
Between 30%F.S. to the 70%F.S. of measurement range, actually it is to ensure that differential pressure pick-up 6 is good in its linear precision
Interlude is used, and improves volume measurement precision, and the differential pressure of the smaller generation of volume of measured object 13 will be bigger, on the contrary then get over
Small, controlling switch valve is closed if value range against regulation and to open next leak rate Q successively according to its leak rate Q slightly larger
The corresponding switch valve of referance leak, the as corresponding second switch valve 10 of the second referance leak 9, under the 3rd step of return restarts
The detecting step in face, until finding the referance leak that differential pressure A meets prescribed limit value；Enter if prescribed limit value is met
The step of row the 7th；
The corresponding switch valve of all referance leaks is closed in 7th step, control, only repeatedly closes balanced valve 4 after the 3rd step, and 5,
The 8th step is carried out again；
8th step, the differential pressure B without referance leak that differential pressure pick-up 6 is detected in identical detection time △ T passes through
Signal is transferred to control unit 2 and recorded；
9th step, control unit 2 passes through display screen by the 4th step and the mathematic interpolation volumetric values of the 8th step record data
Show.
Control unit is exactly basisCalculated, wherein V=volumes；During the presetting detections of Δ T=
Between；The leak rate of respective standard small opening, P is pressed by control unit 2 according to test under Q=test pressures PtTWith the leak rate curve meter of storage
Calculate；P0=atmospheric pressure；Δ P=pressure drops (differential pressure)；And Δ P=A-B, A are differential pressure pick-up when connecting referance leak
Detected differential pressure numerical value, the differential pressure numerical value that differential pressure pick-up when B is without connection referance leak is detected, due to pressure
It is to be subtracted each other to obtain according to two differential pressures to drop Δ P, so can just offset the detection shadow produced when having leakage on gas circuit and measured object
Ring.
Embodiments of the invention are described in detail above, but the content is only presently preferred embodiments of the present invention,
It is not to be regarded as the practical range for limiting the present invention.All equivalent changes made according to the scope of the invention and improvement etc., all should
Still belong within this patent covering scope.
Claims (4)
1. differential pressure type volume measurement method, it is characterised in that：
Including the differential pressure type device for measuring volume for realizing the differential pressure type volume measurement method, it includes a leak detection list
Member, referance leak group and control unit (2), the leak detection unit include an air inlet pipeline (17), tested pipeline (15),
Benchmark pipeline (16) and differential pressure pick-up (6), the air inlet pipeline (17) pass through a valve body group and the two ends of differential pressure pick-up (6)
Connect respectively, and its one end is also connected with tested pipeline (15), the other end is connected with benchmark pipeline (16)；
The referance leak group includes the referance leak (7,9,11) of several different leak rates, each referance leak with tested pipeline
(16) connection can be opened and closed；
The electrical connection of described control unit (2) respectively with valve body group, differential pressure pick-up (6) and referance leak group；
The valve body group includes the Air inflating and exhausting valve (3) and balanced valve (4,5) of a two-bit triplet, the Air inflating and exhausting valve (3)
Air inlet is connected with air inlet pipeline (17), and its gas outlet passes through balanced valve respectively with tested pipeline (15) and benchmark pipeline (16)
(4,5) connect；
The differential pressure type volume measurement method includes：
The first step, the not connected end of tested pipeline (15) and benchmark pipeline (16) is respectively communicated with measured object (13) and primary standard substance
(14), the air inlet pipeline (17) is connected with source of the gas；
Second step, the switch valve corresponding to the referance leak of the minimum leak rate of control unit (2) control is opened；
3rd step, control unit (2) controls two balanced valves (4,5) to open, and controls Air inflating and exhausting valve (3) to open, so as to switch
Start to be inflated measured object (13) and primary standard substance (14) after to gas fill port；
4th step, control unit (2) control balanced valve (4,5) is closed, by presetting balance and the time link of detection,
Differential pressure pick-up (6) detects the differential pressure produced in the case where opening Current standards small opening in detection time, and is passed to by electric signal
Control unit (2) is recorded；
5th step, control unit (2) control balanced valve (4,5) is opened, and is closed the air inlet of Air inflating and exhausting valve (3) and thus switched to
Exhaust channel so that the gas in whole device is discharged by the gas outlet of Air inflating and exhausting valve (3)；
Whether the 6th step, the differential pressure produced by control unit (2) is detected reaches prescribed limit value, if scope against regulation
Value then controls current switch valve to close and opens the corresponding switch valve of the slightly larger referance leak of next leak rate, returns to the 3rd step weight
Newly start following detecting step, until the referance leak that differential pressure meets prescribed limit value is found, and if meeting regulation
Value range then carries out the 7th step；
The corresponding switch valve of all referance leaks is closed in 7th step, control, and balanced valve (4,5) is only repeatedly closed after the 3rd step, then
Carry out the 8th step；
8th step, differential pressure pick-up (6) detected in identical detection time without the differential pressure under referance leak, and pass through electricity
Signal passes to control unit (2) record；
9th step, the volume numerical value of detection is shown by the display screen of controller.
2. differential pressure type volume measurement method according to claim 1, it is characterised in that：Prescribed limit value is differential pressure pick-up
(6) between 30%F.S. to the 70%F.S. of measurement range.
3. differential pressure type volume measurement method according to claim 1 or 2, it is characterised in that：Control unit (2) preserves mark
The pressure and leak rate curve of quasi- small opening group, detect the test pressure under working condition, and pass through electric signal by pressure sensor (1)
Control unit (2) is transmitted to, and calculates the leak rate for the referance leak that current test pressure is currently connected.
4. differential pressure type volume measurement method according to claim 1 or 2, it is characterised in that：The detection of the 6th step is carried out to meet
When defined referance leak, the connection for referance leak is detected successively all in accordance with its leak rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410466492.3A CN104215290B (en) | 2014-09-12 | 2014-09-12 | Differential pressure type volume measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410466492.3A CN104215290B (en) | 2014-09-12 | 2014-09-12 | Differential pressure type volume measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104215290A CN104215290A (en) | 2014-12-17 |
| CN104215290B true CN104215290B (en) | 2017-08-25 |
Family
ID=52097021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410466492.3A Active CN104215290B (en) | 2014-09-12 | 2014-09-12 | Differential pressure type volume measurement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104215290B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490416A (en) * | 2017-05-15 | 2017-12-19 | 宝沃汽车（中国）有限公司 | The method for measuring luggage of vehicle volume |
| CN108007652B (en) * | 2017-12-02 | 2023-06-20 | 天津博益气动股份有限公司 | Multi-channel differential pressure type airtight leak detector and leak detection method |
| CN109115425A (en) * | 2018-09-26 | 2019-01-01 | 长春微控机械制造有限公司 | A kind of gas leakage marking apparatus |
| CN109238597B (en) * | 2018-10-16 | 2019-05-24 | 华中科技大学 | A kind of detection method of differential pressure type air-tightness leakage detection apparatus and its leakage flow |
| CN109813387A (en) * | 2019-01-01 | 2019-05-28 | 中国人民解放军63653部队 | A kind of method of rapid survey cavity volume |
| CN112098305B (en) * | 2020-11-04 | 2021-02-09 | 天津博益气动股份有限公司 | Detection device and method for waterproof detection of waterproof breathable film |
| CN112484942B (en) * | 2020-11-30 | 2022-12-06 | 航天特种材料及工艺技术研究所 | Method and system for measuring leakage rate of small-volume container |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1779422A (en) * | 2004-11-25 | 2006-05-31 | 博益(天津)气动技术研究所有限公司 | Method for determining volume by charge and discharge process |
| CN101373163A (en) * | 2007-08-23 | 2009-02-25 | 博益(天津)气动技术研究所有限公司 | Method for drafting differential pressure and leakage amount relation curve by leak hole method |
| CN101373162A (en) * | 2007-08-23 | 2009-02-25 | 博益(天津)气动技术研究所有限公司 | Method for drafting differential pressure and leakage amount relation curve in leak detection of seal article |
| CN102279028A (en) * | 2011-07-05 | 2011-12-14 | 叶兴林 | Device and method for measuring container volume with high precision |
-
2014
- 2014-09-12 CN CN201410466492.3A patent/CN104215290B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1779422A (en) * | 2004-11-25 | 2006-05-31 | 博益(天津)气动技术研究所有限公司 | Method for determining volume by charge and discharge process |
| CN101373163A (en) * | 2007-08-23 | 2009-02-25 | 博益(天津)气动技术研究所有限公司 | Method for drafting differential pressure and leakage amount relation curve by leak hole method |
| CN101373162A (en) * | 2007-08-23 | 2009-02-25 | 博益(天津)气动技术研究所有限公司 | Method for drafting differential pressure and leakage amount relation curve in leak detection of seal article |
| CN102279028A (en) * | 2011-07-05 | 2011-12-14 | 叶兴林 | Device and method for measuring container volume with high precision |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104215290A (en) | 2014-12-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104215290B (en) | Differential pressure type volume measurement method | |
| KR102227642B1 (en) | Smart valve | |
| US9429493B2 (en) | Manifold assembly for a portable leak tester | |
| CN201965006U (en) | Lithium ion battery differential pressure formula leak hunting device | |
| CN104792473A (en) | Sealing detection device and method for electric product | |
| CN111024327B (en) | Device and method for air leakage self-checking and air leakage detection of object to be detected | |
| CN101191754A (en) | Checking apparatus for checking product sealing performance and checking method | |
| CN204043747U (en) | Differential pressure type device for measuring volume | |
| CN105675224B (en) | The detection method of encapsulating package sealing propertytest system | |
| CN103439055B (en) | A kind of differential pressure air-leakage test temperature compensation | |
| US8201438B1 (en) | Detection of gas leakage | |
| CN203337347U (en) | Multi cavity air tightness test device | |
| CN108007652A (en) | A kind of airtight leak detector of the differential pressure type of multichannel and leak hunting method | |
| CN108398218A (en) | Air-tightness detection device and detection method | |
| JPWO2017122714A1 (en) | Gas supply device capable of measuring flow rate, flow meter, and flow rate measuring method | |
| CN205879474U (en) | Vertical compression leak detector | |
| CN108534963A (en) | A kind of water proofing property detection method and system | |
| CN104215394A (en) | Device and method for detecting sensing coefficient of differential pressure sensor by utilizing leaking hole | |
| CN210625972U (en) | Gas circuit system of built-in standard leak hole of differential pressure type air tightness leak detector | |
| CN106556430A (en) | A kind of gas Actual flow test system and method with self-calibration function | |
| CN207540718U (en) | A kind of multichannel air-tightness tester | |
| CN104833464A (en) | Multifunctional airtight detector and detection method thereof | |
| CN114812972A (en) | Differential pressure double-channel leakage detection method and device and differential pressure double-channel leakage detector | |
| CN201867293U (en) | Gas flow rate standard device | |
| US10545068B2 (en) | Arrangement and method for testing the tightness of a container |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |