CN105806570A - Gas leak-checking detecting device - Google Patents

Gas leak-checking detecting device Download PDF

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Publication number
CN105806570A
CN105806570A CN201610322097.7A CN201610322097A CN105806570A CN 105806570 A CN105806570 A CN 105806570A CN 201610322097 A CN201610322097 A CN 201610322097A CN 105806570 A CN105806570 A CN 105806570A
Authority
CN
China
Prior art keywords
laminar flow
shell
flow tube
flow shell
gas
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.)
Pending
Application number
CN201610322097.7A
Other languages
Chinese (zh)
Inventor
李攀
王旭
万军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZIWEI MACHINERY ELECTRONIC EQUIPMENT CO Ltd SHENYANG
Original Assignee
ZIWEI MACHINERY ELECTRONIC EQUIPMENT CO Ltd SHENYANG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ZIWEI MACHINERY ELECTRONIC EQUIPMENT CO Ltd SHENYANG filed Critical ZIWEI MACHINERY ELECTRONIC EQUIPMENT CO Ltd SHENYANG
Priority to CN201610322097.7A priority Critical patent/CN105806570A/en
Publication of CN105806570A publication Critical patent/CN105806570A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating 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

Abstract

The invention relates to a gas leak-checking detecting device.The gas leak-checking detecting device comprises a laminar flow tube shell.The laminar flow tube shell is connected with a differential pressure sensor through a soft tube; a miniature temperature sensor is pasted to the portion, close to the gas flow position in the laminar flow tube shell, inside the laminar flow tube shell.A laminar flow tube core is fixed to the center of the laminar flow tube shell through a jackscrew; one side of the laminar flow tube shell is connected with a leak-checking connector connected with a to-be-tested piece, and the other side of the laminar flow tube shell is connected with a gas sucking connector connected with a negative pressure gas source.The gas leak-checking detecting device is suitable for detecting a to-be-tested workpiece which is small in leak rate and can not be detected with the general pressure method.

Description

Air leakage detector detecting device
Technical field
The invention belongs to sealing property detection device field, relate generally to a kind of leak-checking apparatus, specifically refer to a kind of Air leakage detector detecting device.
Background technology
Sealing is an important product quality indicator, and as the leakage detection method of sealing monitoring means, generally uses pressure application, but pressure application leak detection has its limitation.
In most of the cases, applying pressure method Leak Detection is applicable, effective for the test block of sealing to be measured.Expression formula is: Q=△ P × V × 60/(Patm × t) (1);
In formula: Q-flow, i.e. the slip ml/min of standard atmosphere pressure;
△ P-Pressure Drop Pa;
V-system under test (SUT) volume;
T-detects the time;
Patm-atmospheric pressure;
But from formula (1), when measured object volume V is relatively big, the detection time is shorter, and when slip Q is little, the limitation of pressure application just displays.
Summary of the invention
Goal of the invention:
In order to solve the deficiency of above-mentioned technology, the invention provides a kind of Air leakage detector detecting device, solve the conventional method detection time long, it is impossible to for quantity-produced test problems;Particularly when measured object volume is bigger, the error that atmosphere measuring produces, the measured object impact that slip is less is very big, and even some is because error cannot detect more than the permission slip of measured object;It is short that this device may be used for the requirement detection time, as assembling line detects in real time, improves production efficiency;It is big that this device may be used for detection measured piece volume, the situation that slip is less, and accuracy of detection is high, easy to use.
Technical scheme:
A kind of Air leakage detector detecting device, it is characterised in that: including laminar flow shell, threadeding with leak hunting joint in laminar flow shell side, leak hunting joint is connected with test specimen, and laminar flow shell opposite side is threadeded with suction joint, and suction joint is connected with negative pressure source of the gas;Micro temperature sensor and laminar flow tube core it is provided with inside laminar flow shell.
Micro temperature sensor pastes inside laminar flow shell, the position of gas flowing in laminar flow shell.
Laminar flow shell top is connected with differential pressure pick-up by flexible pipe, is provided with hose coupling between laminar flow shell and flexible pipe.
Laminar flow tube core is fixed therein heart position by tip jackscrew by laminar flow shell.
Advantage and effect:
This Air leakage detector detecting device of the present invention, has the following advantages and beneficial effect:
It is short that this device may be used for the requirement detection time, as assembling line detects in real time, improves production efficiency.
It is big that this device may be used for detection measured piece volume, the situation that slip is less, and accuracy of detection is high, easy to use.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram.
Description of reference numerals:
1, leak hunting joint, 2, tip jackscrew, 3, micro temperature sensor, 4, laminar flow shell, 5, laminar flow tube core, 6, suction joint, 7, hose coupling, 8, flexible pipe, 9, differential pressure pick-up.
Detailed description of the invention
According to Poiseuille law, application volume flow is mensuration, and expression formula is:
Q=π×r4× Δ p/ (8 η L) (2);
In formula: Q-flow, i.e. slip ml/min,;
△ P-Pressure Drop Pa;
R-laminar flow shell internal bore radius;
2 distances of L-differential pressure pick-up;
η-gas viscosity coefficient.
Slip for detecting measured piece is typically small, and at most also with regard to hundreds of ml/min, extreme portions is below 100ml/min's.But in manufacturing industry, also it is no lack of such demand, namely possibly through tested flow (form as represented with " slip ") bigger, required precision for test is then not as high, only has monitoring or even the effect of monitoring character, now takes volume flow mensuration with regard to preferably.
This phenomenon according to fluid, the present invention proposes a kind of Air leakage detector detecting device, its structure is as shown in fig. 1, including laminar flow shell 4, threaded with leak hunting joint 1 in laminar flow shell 4 side, leak hunting joint 1 is connected with test specimen, and laminar flow shell 4 opposite side is threadeded with suction joint 6, and suction joint 6 is connected with negative pressure source of the gas;Laminar flow shell 4 is internal is provided with micro temperature sensor 3 and laminar flow tube core 5.Suction end adopts standard thread to be connected with the end that leaks hunting, and versatility is good, it is simple to install.
It is internal that micro temperature sensor 3 pastes laminar flow shell 4, the position of gas flowing in laminar flow shell 4.The temperature so recorded, closer to the temperature of laminar flow tube interior gas, reduces the impact of ambient temperature.
Laminar flow shell 4 top is connected with differential pressure pick-up 9 by flexible pipe 8, is provided with hose coupling 7 between laminar flow shell 4 and flexible pipe 8.Hose coupling is locknut joint, coordinates with flexible pipe, good airproof performance.
Laminar flow tube core 5 is fixed therein heart position by tip jackscrew 2 by laminar flow shell 4.Laminar flow tube core 5 makes the air in entrance pipe pass through along the annular gap between laminar flow inner wall of tube shell and laminar flow tube core, produces the effect of laminar flow.During fixed layer flow tube core, fixture inevitably takies the space in annular gap, thus the air passed through is produced impact, adopts tip jackscrew to take up room less, it is possible to reduce adverse influence.
The detection process of Air leakage detector detecting device of the present invention is as follows:
During test, flexible pipe 8 is connected with differential pressure pick-up 9 by laminar flow shell 4 by hose coupling 7;Pressure Drop △ P is obtained by differential pressure pick-up 9 detection.
Being pasted onto laminar flow shell 4 internal, in laminar flow shell 4, micro temperature sensor 3 detection of the position of gas flowing is obtained through the temperature managing interior gas, is checked in by gas viscosity table, gas viscosity value η.
Laminar flow tube core 5 is fixed therein heart position by tip jackscrew 2 by laminar flow shell 4;Laminar flow shell 4 side is connected with test specimen after being connected by screw threads for fastening with leak hunting joint 1, and laminar flow shell 4 opposite side is connected with negative pressure source of the gas or vacuum pump after being connected with suction joint 6 screw threads for fastening.After negative pressure source of the gas air-breathing certain time, in measured workpiece body, original gas is emptied, and after now waiting that flow equilibrium is stable, calculates the actual leakage rate Q of measured workpiece according to the Pressure Drop △ P, the gas viscosity value η that now record.
According to measured workpiece prescription, with actual leakage rate Q contrast determine whether qualified.
Embodiment:
Adopting the Air leakage detector detecting device of said structure, be connected with negative pressure source of the gas or vacuum pump by suction joint 6, leak hunting joint 1 is connected with test specimen, is provided with micro temperature sensor 3 by inside and records temperature 20 degree, and table look-up to obtain η=1.81X10-5, L is the distance between differential pressure pick-up two junction point is laminar flow shell inwall radius with r, according to the △ P that differential pressure pick-up 9 records, calculates Q by formula, allows leakage rate to compare with test specimen, it is judged that whether measured piece is qualified.

Claims (4)

1. an Air leakage detector detecting device, it is characterized in that: include laminar flow shell (4), threaded with leak hunting joint (1) in laminar flow shell (4) side, leak hunting joint (1) is connected with test specimen, laminar flow shell (4) opposite side is threadeded with suction joint (6), and suction joint (6) is connected with negative pressure source of the gas;Laminar flow shell (4) is internal is provided with micro temperature sensor (3) and laminar flow tube core (5).
2. Air leakage detector detecting device according to claim 1, it is characterised in that: it is internal that micro temperature sensor (3) pastes laminar flow shell (4), close to the position of the interior gas flowing of laminar flow shell (4).
3. Air leakage detector detecting device according to claim 1, it is characterised in that: laminar flow shell (4) top is connected with differential pressure pick-up (9) by flexible pipe (8), is provided with hose coupling (7) between laminar flow shell (4) and flexible pipe (8).
4. Air leakage detector detecting device according to claim 1, it is characterised in that: laminar flow tube core (5) is fixed therein heart position by tip jackscrew (2) by laminar flow shell (4).
CN201610322097.7A 2016-05-16 2016-05-16 Gas leak-checking detecting device Pending CN105806570A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610322097.7A CN105806570A (en) 2016-05-16 2016-05-16 Gas leak-checking detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610322097.7A CN105806570A (en) 2016-05-16 2016-05-16 Gas leak-checking detecting device

Publications (1)

Publication Number Publication Date
CN105806570A true CN105806570A (en) 2016-07-27

Family

ID=56451196

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610322097.7A Pending CN105806570A (en) 2016-05-16 2016-05-16 Gas leak-checking detecting device

Country Status (1)

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CN (1) CN105806570A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111504578A (en) * 2020-04-14 2020-08-07 应急管理部天津消防研究所 Gas leakage detector

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004163378A (en) * 2002-11-11 2004-06-10 Smc Corp Calculation method of leak flow rate of leak tester
CN201331421Y (en) * 2008-12-03 2009-10-21 东莞市骏朗自动化科技有限公司 Air tightness detecting device of engine cylinder head
CN101667229A (en) * 2009-09-21 2010-03-10 南京工业大学 Predicting method of leakage rate of bolted flange connection structure with anti-loosing washer
CN101761780A (en) * 2010-01-11 2010-06-30 中国石油大学(华东) Gas pipeline leakage detecting and positioning device and method thereof
WO2011061005A1 (en) * 2009-11-17 2011-05-26 Endress+Hauser Process Solutions Ag Self-monitoring flow measurement assembly and method for the operation thereof
CN102252808A (en) * 2011-04-26 2011-11-23 山东电力研究院 Online detecting method and device for air leakage quantity of vacuum system of turbo generator unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004163378A (en) * 2002-11-11 2004-06-10 Smc Corp Calculation method of leak flow rate of leak tester
CN201331421Y (en) * 2008-12-03 2009-10-21 东莞市骏朗自动化科技有限公司 Air tightness detecting device of engine cylinder head
CN101667229A (en) * 2009-09-21 2010-03-10 南京工业大学 Predicting method of leakage rate of bolted flange connection structure with anti-loosing washer
WO2011061005A1 (en) * 2009-11-17 2011-05-26 Endress+Hauser Process Solutions Ag Self-monitoring flow measurement assembly and method for the operation thereof
CN101761780A (en) * 2010-01-11 2010-06-30 中国石油大学(华东) Gas pipeline leakage detecting and positioning device and method thereof
CN102252808A (en) * 2011-04-26 2011-11-23 山东电力研究院 Online detecting method and device for air leakage quantity of vacuum system of turbo generator unit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
朱正德: "泄露检测中的流量法及其适用性分析", 《上海计量测试》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111504578A (en) * 2020-04-14 2020-08-07 应急管理部天津消防研究所 Gas leakage detector

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Application publication date: 20160727

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