CN203365087U - Differential pressure type airtight leak detection instrument calibration device - Google Patents

Differential pressure type airtight leak detection instrument calibration device Download PDF

Info

Publication number
CN203365087U
CN203365087U CN 201320410589 CN201320410589U CN203365087U CN 203365087 U CN203365087 U CN 203365087U CN 201320410589 CN201320410589 CN 201320410589 CN 201320410589 U CN201320410589 U CN 201320410589U CN 203365087 U CN203365087 U CN 203365087U
Authority
CN
China
Prior art keywords
pressure
gas
leak locator
holder
airtight leak
Prior art date
Application number
CN 201320410589
Other languages
Chinese (zh)
Inventor
洪扁
许红
张书令
潘征宇
Original Assignee
上海市计量测试技术研究院
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 上海市计量测试技术研究院 filed Critical 上海市计量测试技术研究院
Priority to CN 201320410589 priority Critical patent/CN203365087U/en
Application granted granted Critical
Publication of CN203365087U publication Critical patent/CN203365087U/en

Links

Abstract

The utility model relates to an airtight leak detection instrument calibration device which belongs to the detection field. The differential pressure type airtight leak detection instrument calibration device is characterized in that a nitrogen gas cylinder is used as a gas source, and is connected with a gas tank through a pressure reducing valve and a filter; a pressure gauge is arranged on the gas tank; the gas tank outputs pressure through the regulating control of an electrical proportional valve and an electromagnetic pneumatic valve; an output pressure end is connected with an airtight leak detection instrument to be calibrated; two output ends of the airtight leak detection instrument are respectively connected with two same gas tanks which are used as the pressure vessels of a standard object end and a measured object end. A differential pressure digital pressure gauge is arranged in the middle to be used as a standard device of differential pressure calibration. The connection circuit of the gas tank of the measured object end is connected with a digital pressure gauge which is used as a pressure standard device of inflation pressure calibration. The measured object end is connected with a positive pressure standard leak hole which is used as a standard device of leak rate calibration. The measured object end is connected with a volume regulator which is used as a standard device of pressure difference regulating and volume measurement calibration in the airtight leak detection instrument.

Description

The airtight leak locator calibrating installation of a kind of differential pressure type
Technical field
The utility model relates to airtight leak locator calibrating installation, relates in particular to the airtight leak locator calibrating installation of a kind of differential pressure type.
Background technology
As shown in Figure 1, the principle of work of the airtight leak locator of differential pressure type is: source of the gas arrives reduction valve by filtrator, set up test pressure by reduction valve, solenoid valve 1, 2, 3 energisings are to primary standard substance and measured object inflation, after inflation, solenoid valve 2, 3 outages simultaneously, isolation measured object end and primary standard substance end, then solenoid valve 1 outage, emptying solenoid valve 1 and solenoid valve 2, pressure between 3, after certain equilibration time t, detect the pressure reduction of measured object end and primary standard substance end by differential pressure pick-up, calculate slip according to this pressure reduction by circuit, detect complete to solenoid valve 2, 3 energisings, make the gas of measured object end and primary standard substance end by solenoid valve 1 venting, the complete solenoid valve 2 of exitting, 3 outages, and then enter the next circulation that detects.The filtrator of test block and standard component front is that the pollutant of test block and standard component the inside is brought leak locator into when preventing from exitting.Can regard the ideal gas state as at detection-phase, its formula is:
pV T = ( p - Δp ) V T 1 + p atm ΔV T atm - - - ( 1 )
ΔV = ( pV T - pV T 1 + ΔpV T 1 ) T atm p atm - - - ( 2 )
In formula:
The airtight leak locator charge pressure of P-differential pressure type (absolute pressure); The pressure reduction formed after Δ p-balance; P atm-atmospheric pressure (absolute pressure); V-measured object end volume; Δ V-measured object end leaks to the gas volume in atmosphere; The absolute temperature of T-while having inflated; T 1absolute temperature after-balance; T atm-actual environment absolute temperature.
Airtight leak locator is according to equilibration time, and the gas volume leaked in atmosphere obtains actual slip L:
L = ΔV t - - - ( 3 )
L = ΔpV pt - - - ( 4 )
In formula:
The slip that the airtight leak locator of L-differential pressure type is measured; The time of the airtight leak locator balance detection of t-differential pressure type.
When the actual detection of the airtight leak locator of differential pressure type is leaked, think that the temperature of system and environment temperature are balances, i.e. T=T 1=T atmtherefore slip is calculated and is approximately shown in formula (4).
The method of the airtight leak locator of calibration difference die mould is a minute parametric calibration at present.At first be calibration charge pressure index, at measured object end Bonding pressure standard, close the outlet valve of primary standard substance end, by airtight leak locator self, control charge pressure, by direct comparison method, by standard, calibrate the shown charge pressure indicating value of airtight leak locator; Next is the calibration difference pressure sensor, by airtight leak locator shut electromagnetic valve 2,3, allows the outlet valve of primary standard substance end stay open, and at the fine setting of measured object end Bonding pressure and pressure standard meter, by pressure standard meter, passes through direct comparison method calibration difference pressure sensor; In addition, calibrate the accuracy of the measured leak rate index of airtight leak locator, at measured object end Bonding pressure standard and referance leak, close the outlet valve of primary standard substance end, control, produce the forepressure of referance leak by airtight leak locator, by the direct measured slip value of more airtight leak locator of the standard leak rate value of referance leak.
And there is more drawback in the method for minute airtight leak locator of parametric calibration.At first, by gauge pressure, detect differential pressure, although its reference edge is all atmospheric pressure, atmospheric pressure also exists homogeneity and gradient, so reference edge can bring certain pressure error; Secondly, when detecting leak rate, because the volume of primary standard substance end and measured object end differs larger, the two ends temperature is not very even, therefore temperature difference can cause error when differential pressure pick-up is measured differential pressure, thereby cause between actual slip and measured slip, has certain error; Again, known by formula (4), airtight leak locator need to be known the internal volume V of measured object end when converting differential pressure to leak rate, therefore when the airtight leak locator of calibration, the tested end internal volume that needs the airtight leak locator of calibration, can reduce to be forbidden because of internal volume the error of bringing slip to measure like this.
Summary of the invention
Technical problem to be solved in the utility model is to provide the airtight leak locator calibrating installation of a kind of differential pressure type, the calibration steps and the device that solve the present airtight leak locator of differential pressure type detect differential pressure by gauge pressure, there is certain pressure error, the temperature difference of primary standard substance end and measured object end causes that there is error in differential pressure pick-up while measuring differential pressure, and is forbidden the defect that makes leak rate inaccurate because of the internal volume of measured object end.
Technical scheme
The calibrating installation of the airtight leak locator of a kind of differential pressure type, it is characterized in that: adopt nitrogen cylinder as source of the gas, be connected to gas-holder to the gas-holder air feed by reduction valve and filtrator, tensimeter indication gas-holder air pressure is installed on described gas-holder, described gas-holder connects electric Proportion valve and electromagnetism-gas-driving valve, controlling output pressure by the adjusting of electric Proportion valve and electromagnetism-gas-driving valve is stable pressure, the pressure output end of described electric Proportion valve and electromagnetism-gas-driving valve is connected to airtight leak locator to be calibrated, two output terminals of described airtight leak locator connect respectively two identical gas-holder as the primary standard substance end of the airtight leak locator of differential pressure type and the pressure vessel of measured object end, be connected with the pressure standard meter of digital pressure gauge as airtight leak locator charge pressure calibration on the described gas-holder link circuit as differential pressure type leak locator measured object end, be provided with the standard of differential pressure digital pressure gauge as the pressure calibration of airtight leak locator differential pressure in the middle of the loop of described two identical gas-holder, the described gas-holder as differential pressure type leak locator measured object end also is connected with the standard of malleation referance leak as airtight leak locator leak rate calibration, the described gas-holder as differential pressure type leak locator measured object end also is connected with the standard of volume-adjustment device as pressure reduction adjusting and airtight leak locator internal volume Measurement and calibration.
Described volume-adjustment device comprises piston and the grating scale that is arranged on piston one side, and described piston is arranged on to-and-fro movement on motor ball screw guide rail.
Described gas-holder connects electric Proportion valve and electromagnetism-gas-driving valve, and described electric Proportion valve and electromagnetism-gas-driving valve are respectively arranged with two, reduces gradually and stable output pressure, regulates the input pressure of airtight leak locator.Beneficial effect
The calibrating installation of the airtight leak locator of differential pressure type of the present utility model provides source of the gas by gas cylinder, after the reduction valve decompression, pour in gas-holder, gas-holder is used for reaching the equalized temperature of gas and stablizing, gases at high pressure in gas-holder are airtight leak locator air feed after the adjusting of electric Proportion valve, airtight leak locator provides equal pressure by two output terminals that are adjusted to of internal electrical magnet valve, directly compare and measure the charge pressure displayed value of airtight leak locator by digital pressure gauge, measure the measured differential pressure force value of airtight leak locator by the differential pressure digital pressure gauge, wherein differential pressure is simulated generation by the volume-adjustment device, calibrate the measured slip of airtight leak locator by referance leak, thereby realized integrated structural design, and more accurate to the calibration of each parameter of the airtight leak locator of differential pressure type, avoid present minute parametric calibration method to measure inaccurate defect because parameter error or environmental error cause in calibration process.
The accompanying drawing explanation
The principle of work schematic diagram that Fig. 1 is the airtight leak locator of differential pressure type.
Fig. 2 is calibrating installation structural representation of the present utility model.
Wherein: 1-nitrogen cylinder, 2-reduction valve, 3-filtrator, the 4-gas-holder, 5-tensimeter, 6-electric Proportion valve, the 7-electromagnetism-gas-driving valve, the airtight leak locator of 8-, the gas-holder of 9-measured object end, the gas-holder of 10-primary standard substance end, the 11-digital pressure gauge, 12-differential pressure digital pressure gauge, 13-malleation referance leak, 14-volume-adjustment device.
Embodiment
Below in conjunction with specific embodiments and the drawings, further set forth the utility model.
As shown in Figure 2, for solving the defect of minute parametric calibration now, designed the calibrating installation of the airtight leak locator of differential pressure type of integral type, adopt nitrogen cylinder 1 as source of the gas, be connected to gas-holder 4 to the gas-holder air feed by reduction valve 2 and filtrator 3, tensimeter 5 indication gas-holder air pressure are installed on described gas-holder 4, described gas-holder 4 connects electric Proportion valve 6 and electromagnetism-gas-driving valve 7, controlling output pressure by the adjusting of electric Proportion valve 6 and electromagnetism-gas-driving valve 7 is stable pressure, the pressure output end of described electric Proportion valve 6 and electromagnetism-gas-driving valve 7 is connected to airtight leak locator 8 to be calibrated, two output terminals of described airtight leak locator 8 connect respectively two identical gas-holder as the primary standard substance end of the airtight leak locator of differential pressure type and the pressure vessel of measured object end, be connected with the pressure standard meter of digital pressure gauge 11 as airtight leak locator 8 charge pressure calibrations on described gas-holder 9 link circuits as differential pressure type leak locator measured object end, be provided with the standard of differential pressure digital pressure gauge 12 as airtight leak locator 8 differential pressure pressure calibrations in the middle of the loop of described two identical gas-holder, the described gas-holder 9 as differential pressure type leak locator measured object end also is connected with the standard of malleation referance leak 13 as airtight leak locator 8 leak rate calibrations, the described gas-holder 9 as differential pressure type leak locator measured object end also is connected with the standard of volume-adjustment device 14 as pressure reduction adjusting and airtight leak locator 8 internal volume Measurement and calibrations.
Described volume-adjustment device 14 comprises piston and the grating scale that is arranged on piston one side, and described piston is arranged on to-and-fro movement on motor ball screw guide rail.
Described gas-holder 4 connects electric Proportion valve 6 and electromagnetism-gas-driving valve 7, and described electric Proportion valve 6 and electromagnetism-gas-driving valve 7 are respectively arranged with two, reduces gradually and stable output pressure, regulates the input pressure of airtight leak locator 8.
Concrete calibration process is: as shown in Figure 2, provide source of the gas by nitrogen cylinder 1, after reduction valve 2 decompressions, pour in gas-holder 4, gas-holder 4 is for the equalized temperature that reaches gas and stable, gases at high pressure in gas-holder 4 are airtight leak locator 8 air feed after the adjusting of electric Proportion valve 6, airtight leak locator 8 provides equal pressure by two output terminals that are adjusted to of internal electrical magnet valve, measurement by digital pressure gauge 11 directly compares the charge pressure displayed value of this measured value and the measurement of airtight leak locator, measurement by differential pressure digital pressure gauge 12 directly compares this measured value and the measured differential pressure force value of airtight leak locator, wherein differential pressure is simulated generation by volume-adjustment device 14, and the standard as airtight leak locator 8 internal volume Measurement and calibrations, calibrate the measured slip of airtight leak locator by the measurement of malleation referance leak 13.

Claims (3)

1. the calibrating installation of the airtight leak locator of differential pressure type, it is characterized in that: adopt nitrogen cylinder as source of the gas, be connected to gas-holder to the gas-holder air feed by reduction valve and filtrator, tensimeter indication gas-holder air pressure is installed on described gas-holder, described gas-holder connects electric Proportion valve and electromagnetism-gas-driving valve, controlling output pressure by the adjusting of electric Proportion valve and electromagnetism-gas-driving valve is stable pressure, the pressure output end of described electric Proportion valve and electromagnetism-gas-driving valve is connected to airtight leak locator to be calibrated, two output terminals of described airtight leak locator connect respectively two identical gas-holder as the primary standard substance end of the airtight leak locator of differential pressure type and the pressure vessel of measured object end, be connected with the pressure standard meter of digital pressure gauge as airtight leak locator charge pressure calibration on the described gas-holder link circuit as differential pressure type leak locator measured object end, be provided with the standard of differential pressure digital pressure gauge as the pressure calibration of airtight leak locator differential pressure in the middle of the loop of described two identical gas-holder, the described gas-holder as differential pressure type leak locator measured object end also is connected with the standard of malleation referance leak as airtight leak locator leak rate calibration, the described gas-holder as differential pressure type leak locator measured object end also is connected with the standard of volume-adjustment device as pressure reduction adjusting and airtight leak locator internal volume Measurement and calibration.
2. the calibrating installation of the airtight leak locator of differential pressure type as claimed in claim 1 is characterized in that: described volume-adjustment device comprises piston and is arranged on the grating scale of piston one side, and described piston is arranged on to-and-fro movement on motor ball screw guide rail.
3. the calibrating installation of the airtight leak locator of differential pressure type as claimed in claim 1, it is characterized in that: described gas-holder connects electric Proportion valve and electromagnetism-gas-driving valve, described electric Proportion valve and electromagnetism-gas-driving valve are respectively arranged with two, reduce gradually and stable output pressure, regulate the input pressure of airtight leak locator.
CN 201320410589 2013-07-10 2013-07-10 Differential pressure type airtight leak detection instrument calibration device CN203365087U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201320410589 CN203365087U (en) 2013-07-10 2013-07-10 Differential pressure type airtight leak detection instrument calibration device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 201320410589 CN203365087U (en) 2013-07-10 2013-07-10 Differential pressure type airtight leak detection instrument calibration device

Publications (1)

Publication Number Publication Date
CN203365087U true CN203365087U (en) 2013-12-25

Family

ID=49812833

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 201320410589 CN203365087U (en) 2013-07-10 2013-07-10 Differential pressure type airtight leak detection instrument calibration device

Country Status (1)

Country Link
CN (1) CN203365087U (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103884718A (en) * 2014-04-16 2014-06-25 中国石油化工股份有限公司 Testing device for detecting optical gas imaging equipment
CN104865026A (en) * 2015-04-12 2015-08-26 中国计量学院 Polyethylene valve sealing performance room temperature low pressure test method
CN104931213A (en) * 2015-05-27 2015-09-23 中国石油化工股份有限公司 Test apparatus and test method for simulating inner leakage of gas valve
CN105606318A (en) * 2015-11-26 2016-05-25 上海市计量测试技术研究院 Calibration method and device of airtight leak detector
CN106323567A (en) * 2016-08-05 2017-01-11 中山市恒辉自动化科技有限公司 Differential pressure method part air-tightness detection device
CN106556430A (en) * 2016-10-17 2017-04-05 金卡高科技股份有限公司 A kind of gas Actual flow test system and method with self-calibration function
CN107677429A (en) * 2017-08-18 2018-02-09 湖南军成科技有限公司 A kind of air-tightness detection device and its detection method
CN109655297A (en) * 2018-12-30 2019-04-19 珠海市广源信科技有限公司 A kind of vacuum generator method for testing performance

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103884718A (en) * 2014-04-16 2014-06-25 中国石油化工股份有限公司 Testing device for detecting optical gas imaging equipment
CN103884718B (en) * 2014-04-16 2017-12-01 中国石油化工股份有限公司 A kind of experimental rig for being used to detect optics gas imaging equipment
CN104865026B (en) * 2015-04-12 2017-12-26 中国计量学院 Polyethylene valve tightness room temperature low pressure test (LPT) method
CN104865026A (en) * 2015-04-12 2015-08-26 中国计量学院 Polyethylene valve sealing performance room temperature low pressure test method
CN104931213B (en) * 2015-05-27 2017-07-18 中国石油化工股份有限公司青岛安全工程研究院 The experimental rig and test method of leakage in a kind of simulation gas valve
CN104931213A (en) * 2015-05-27 2015-09-23 中国石油化工股份有限公司 Test apparatus and test method for simulating inner leakage of gas valve
CN105606318A (en) * 2015-11-26 2016-05-25 上海市计量测试技术研究院 Calibration method and device of airtight leak detector
CN106323567A (en) * 2016-08-05 2017-01-11 中山市恒辉自动化科技有限公司 Differential pressure method part air-tightness detection device
CN106556430A (en) * 2016-10-17 2017-04-05 金卡高科技股份有限公司 A kind of gas Actual flow test system and method with self-calibration function
CN107677429A (en) * 2017-08-18 2018-02-09 湖南军成科技有限公司 A kind of air-tightness detection device and its detection method
CN109655297A (en) * 2018-12-30 2019-04-19 珠海市广源信科技有限公司 A kind of vacuum generator method for testing performance

Similar Documents

Publication Publication Date Title
US9952078B2 (en) Upstream volume mass flow verification systems and methods
US9400004B2 (en) Transient measurements of mass flow controllers
US3657926A (en) Method and apparatus for measuring physical phenomena
CN102944358B (en) High and low temperature vacuum calibrating device and method
CN101470016B (en) Apparatus for measuring volume by built-in method
US4078421A (en) Method and automatic device for the testing of tight cavities
CN202903434U (en) A detecting device
CN202614463U (en) A temperature drift calibration device of a piezoresistive pressure sensor
CN101936791B (en) Digital pressure gauge
CN103674327B (en) A kind of Automatic thermal resistance temperature calibration instrument
CN101718726A (en) Device and method for measuring gas specific heat ratio
CN102073006B (en) Calibration method of electrical properties of solar cells
KR20090003195A (en) Leakage inspecting method and leakage inspecting device for pipe lines
CN104792473B (en) The device for detecting sealability and method of electronic product
CN102445303B (en) Experiment table for mass calibration of oil pressure sensor
CN100383535C (en) Method and device for calibrating wide-band sampling oscillograph
US20130000380A1 (en) Method for detecting high-pressure sealing performance of gas system after impact test of compressed natural gas vehicle
CN204214622U (en) Packing container is airtight, hydraulic pressure comprehensive pick-up unit
CN201819769U (en) Calibrating device for sudden-rising pressure relay
CN103041724B (en) Novel air distributing device in static volume method and air distributing method
CN101251585A (en) Method and apparatus for checking global error of high voltage energy metering installation
CN102359833B (en) Temperature rise test device of winding thermometer for transformer
CN201207013Y (en) Detecting machine for airtightness of oil tank
CN103673900A (en) Field calibration device of linear displacement measuring system
CN101825514A (en) Flow-type leakage detection method and device thereof

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
EXPY Termination of patent right or utility model
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20131225

Termination date: 20140710