CN110411676A - A kind of valve leak amount detecting device - Google Patents
A kind of valve leak amount detecting device Download PDFInfo
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- CN110411676A CN110411676A CN201910637274.4A CN201910637274A CN110411676A CN 110411676 A CN110411676 A CN 110411676A CN 201910637274 A CN201910637274 A CN 201910637274A CN 110411676 A CN110411676 A CN 110411676A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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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
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/224—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for valves
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- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to a kind of valve leak amount detecting devices, belong to the technical field of Subzero valve low temperature test, including helium booster pump and leakage rate analyzer；Connection is connected with the flange of measured valve arrival end by pressure pipeline in helium booster pump；Leakage rate analyzer includes the first constant temperature and pressure device, the first helium purity sensor, the second constant temperature and pressure device, the second helium purity sensor, analytical calculation unit and flowmeter；First helium purity sensor and the second helium purity sensor are respectively used to detection helium volume content；Flowmeter is used to detect the flow of the mixed gas of the second constant temperature and pressure device.Detection device of the invention can carry out the assessment of Subzero valve sealing performance in the environment of simulating Subzero valve internal condition pressure and temperature, and can obtain accurately leakage numerical quantity.And simple flow, it is structurally reasonable, can quick data measured, and guarantee the accuracy of data measured, and assessment result is accurate, error is small, and opereating specification is wide.
Description
Technical field
The present invention relates to the technical fields of Subzero valve low temperature test, are specifically related to a kind of valve leak amount detection device
It sets.
Background technique
With industrial expansions such as liquefied natural gas, ethylene petrochemical industry, the application field of Subzero valve is more and more extensive, market
Demand also rises year by year.In the production process of Subzero valve, the valve overall performance test carried out under cryogenic conditions be and its
Important link.
According to products standards, the leakage rate that Subzero valve allows to have certain, when leakage rate is lower than standard specified value
It can be determined as qualification.However, under Subzero valve real working condition simulated conditions, to the test macro of Subzero valve leakage rate
Or test method is but rarely reported.
Summary of the invention
In order to solve Subzero valve under real working condition simulated conditions the technical issues of leakage rate quantitative test, the present invention is mentioned
For a kind of valve leak amount detecting device.
In order to achieve the object of the present invention, the invention adopts the following technical scheme:
The purpose of the present invention one is to provide for: a kind of valve leak amount detecting device, including helium booster pump and leakage
Measure analyzer；Connection is connected with the flange of measured valve arrival end by pressure pipeline in the helium booster pump；
The leakage rate analyzer includes the first constant temperature and pressure device, the first helium purity sensor, the second constant temperature and pressure device, the
Two helium purity sensors, analytical calculation unit and flowmeter；The first helium purity sensor is for detecting through the first constant temperature perseverance
Helium volume content before the valve in mixed gas after depressor temperature-control pressure-control；The second helium purity sensor is for detecting through the
Helium volume content after the valve in gas after two constant temperature and pressure device temperature-control pressure-controls；The flowmeter is sensed set on the second helium purity
The exit of device, for detecting gas flow after valve；
The analytical calculation unit is equipped with the first analysis port, the second analysis port and third analysis port；It is described tested
Valve inlet end flanges, the first constant temperature and pressure device, the first helium purity sensor sequentially turn on connection by preceding analysis of pipeline, and first
Analysis port is connect by the first detection and control circuitry with the first helium purity sensor；The measured valve outlet end flange, the second perseverance
Warm barostat, the second helium purity sensor sequentially turn on connection by post analysis pipeline, and second analysis port passes through second
Detection and control circuitry is connect with the second helium purity sensor, and third analysis port is connect by third detection and control circuitry with flowmeter.
Preferably, the pressure pipeline is equipped with pigtail；It is equipped at the pigtail cold for managing interior gas
But subcooler；The pressure pipeline is additionally provided with pressurization control valve；The preceding analysis of pipeline is respectively equipped with post analysis pipeline
Preceding analysis valve and post analysis valve.
Preferably, the first constant temperature and pressure device and the second constant temperature and pressure device include pressure reducing valve, heating element with
Temperature controller；The calculation formula of the practical leakage rate of measured valve is preset in the analytical calculation unit, helium booster pump carries
Enter the characteristic parameter of helium and flows through the characteristic parameter of measured valve medium.
Preferably, valve leak amount detecting device further includes valve test pipeline assembly and stores cooling medium
Reservoir；Valve test pipeline assembly includes for pipeline after pipeline and valve to be connected before the valve of cooling medium；The liquid storage
Pipeline is sequentially turned on reservoir and is connect after pipeline, measured valve, valve before slot, valve, and forms closed circuit；The measured valve
It is equipped with temperature sensor；Pipeline is additionally provided with the cryogenic pump to cool down for cooling medium in pipe before the valve；In entering for cryogenic pump
Mouth end is equipped with the gas-liquid separator being connected to reservoir；Choked flow valve is with after before pipeline is respectively equipped with pipeline after valve before the valve
Choked flow valve.
Preferably, the preceding analysis of pipeline and the link position of measured valve entrance end flanges, which are located at, surveys valve inlet
The lower of end flanges；The post analysis pipeline and the link position of measured valve outlet end flange are located at measured valve outlet hold-carrying
Blue eminence.
Preferably, the cooling medium is liquid nitrogen.
The purpose of the present invention two is to provide for: the detection method of valve leak amount detecting device, detection method are for example following
Step:
S1, valve are cooling: measured valve cooling medium of connecting is flowed through valve inner cold system inside measured valve, valve
Door inner cold system includes pipeline and pipeline after valve before valve, and pipeline is respectively equipped with preceding choked flow valve and rear choked flow after the preceding pipeline of valve and valve
Valve after measured valve is cooled to temperature to be tested, then closes preceding choked flow valve, measured valve and rear choked flow valve respectively；
It is tested before S2, valve: importing the helium of set temperature and pressure in measured valve arrival end, measured valve arrival end
Helium and the cooling medium of gasification are mixed into mixed gas, and the first constant temperature and pressure device regulates and controls mixed gas to set temperature and pressure
Afterwards, helium volume content r before detection valveHe1；
It is tested after valve: after the second constant temperature and pressure device regulates and controls the outlet end gas to set temperature and pressure of measured valve, point
It Jian Ce not helium volume content r after valveHe2With gas flow V after valvef2；
S3, leaking rate formulas: analytical calculation unit measures the intrinsic parameter of helium, the intrinsic parameter of cooling medium, step S2
Valve before helium volume content rHe1, helium volume content r after valveHe2With gas flow V after valvef2It is calculated, acquires tested valve
The leakage rate of door.
Preferably, leakage calculation formula is as follows: helium volume content r before the valve of measured valve entranceHe1Calculating
Formula such as following formula (1):
Wherein, VHe1For the volume of helium before valve；V1For the volume total amount of mixed gas before valve；
The mass content X that helium before valve accounts for mixed gas is converted by formula (1)He1, formula (2) specific as follows:
Wherein, ρHe1For the density of helium before valve；ρ1For the density of mixed gas before valve；
Before valve, helium accounts for the mass content X of mixed gas after valveHe2Are as follows:
Wherein, rHe2For helium volume content after valve；ρHe2For the density of helium after valve；ρ2For the density of gas after valve；
The leakage volume V of helium after valveHe2Are as follows:
VHe2=rHe2Vf2 (4)
The leakage quality m of helium after valveHe2Are as follows:
mHe2=ρHe2VHe2 (5)
Wherein, rHe2For helium volume content after valve；Vf2For gas flow after valve；ρHe2For the density of helium after valve；
It, can be in the hope of the leakage gross mass m of measured valve by above formulafWith the overall accumulated amount V of leakagef1It is as follows respectively:
Its above formula (6), (7) rightmost side rHe1、rHe2、Vf2It is actually measured, ρHe2、ρ1、ρHe1For under live state
Corresponding density, for constant pressure at a temperature of, the density of the mixed gas of fixed proportion content is steady state value.
The beneficial effects of the present invention are: the quantitative detection of leakage rate is completed by leakage rate analyzer, because of existing valve
When testing its airtightness, locating cooling system is external cooling, after being cooled to suitable temperature outside measured valve, then into
The test of row airtightness, because cooling medium is not present in valve internal, so only needing to be passed through pressurization helium before valve, in closing valve
The presence or absence of rear side re-test helium of door and helium gas flow, for judging whether airtightness is qualified；Measured valve body in the present invention
In inner cooling system, after cooling medium is continually fed into measured valve to suitable temperature, airtightness test is carried out, it is practical
When test, the cooling medium in pipeline can not often exclude completely, or exclude to waste a large amount of time completely, cause cold
But temperature recovery after the valve heat dissipation after, so that the test condition of hermetical testing is unstable, so, test method of the invention is simultaneously
It does not need to be also that can carry out precise measurement, practicability with higher and accuracy under conditions of cooling medium empties.
According to the regulation of product standard, the leakage rate that Subzero valve allows to have certain, as long as being no more than standard specified value, all
It can determine that qualification.Evaluation system of the invention is to be filled with helium in Subzero valve inlet, is sensed using the second helium purity
Whether contain helium on rear side of device detection measured valve, and measures helium volume content after valve.Helium can be detected after valve, it was demonstrated that
Measured valve is in the presence of leakage, but still it cannot be determined whether can reach standard specified value, the present invention also divides in after and before the valve
It She Zhi not constant temperature and pressure device；And the first helium purity sensor is additionally provided with before valve, and for measuring before valve through helium booster pump
Helium volume content before the valve of loading helium；It is additionally provided with flowmeter after second helium purity sensor, for flowing through after measuring valve
The flow of the mixed gas of meter.Then, then by with the first helium purity sensor, the second helium purity sensor and flow measurement
Data are obtained, common be loaded into analytical calculation unit is calculated.Information is turned because in analytical calculation unit, first carrying out A/D conversion
After turning to signal, since analytical calculation unit has been preset with the calculation formula of the practical leakage rate of measured valve, the feature of helium
The reality of measured valve can be obtained by formula (1)~(7) calculating with the characteristic parameter for flowing through measured valve medium in parameter
Border leakage rate.Leakage rate of the invention includes leakage gross mass mfWith the overall accumulated amount V of leakagef1。
Subzero valve sealing performance assessment system of the invention can be in simulation Subzero valve internal condition pressure and temperature
In the environment of carry out the assessment of Subzero valve sealing performance, and can obtain accurately leakage numerical quantity.Except test and evaluation under low temperature
Except valve, the test and evaluation under room temperature, hot environment to valve can be applicable to.Assessment system process letter of the invention
Just, structurally reasonable, can quick data measured, and guarantee the accuracy of data measured, and assessment result is accurate, error is small, behaviour
It is wide to make range.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Subzero valve sealing performance assessment system of the present invention；
Fig. 2 is the structural schematic diagram of valve inner cold system of the present invention.
11- helium booster pump, 12- pigtail, 13- subcooler, 14- pressurization control valve, 2- leakage rate analyzer,
The first constant temperature and pressure of 21- device, the first helium of 22- purity sensor, the second constant temperature and pressure of 23- device, the second helium of 24- purity sensor,
Valve, 28- post analysis valve, 3- measured valve, 4- reservoir, 5- are analyzed before 25- analytical calculation unit, 26- flowmeter, 27-
Choked flow valve after choked flow valve, 72- before cryogenic pump, 6- gas-liquid separator, 71-.
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment 1
As shown in Figure 1, a kind of valve leak amount detecting device, including helium booster pump 11 and leakage rate analyzer 2；It is described
Connection is connected with the flange of 3 arrival end of measured valve by pressure pipeline in helium booster pump 11；
The leakage rate analyzer 2 includes the first constant temperature and pressure device 21, the first helium purity sensor 22, the second constant temperature and pressure
Device 23, the second helium purity sensor 24, analytical calculation unit 25 and flowmeter 26；The first helium purity sensor 22 is for examining
Helium volume content before valve of the survey in the mixed gas after 21 temperature-control pressure-control of the first constant temperature and pressure device；The second helium purity passes
Sensor 24 is used to detect helium volume content after the valve in the gas after 23 temperature-control pressure-control of the second constant temperature and pressure device；The flow
Meter 26 is set to the exits of the second helium purity sensor 24, for detecting gas flow after valve；
The analytical calculation unit 25 is equipped with the first analysis port, the second analysis port and third analysis port；The quilt
3 entrance end flanges of side valve door, the first constant temperature and pressure device 21, the first helium purity sensor 22 sequentially turn on company by preceding analysis of pipeline
It connects, the first analysis port is connect by the first detection and control circuitry with the first helium purity sensor 22；The measured valve 3 exports hold-carrying
Orchid, the second constant temperature and pressure device 23, the second helium purity sensor 24 sequentially turn on connection, second analysis by post analysis pipeline
Port is connect by the second detection and control circuitry with the second helium purity sensor 24, and third analysis port passes through third detection and control circuitry and stream
Meter 26 connects.
Embodiment 2
On the basis of embodiment 1, the pressure pipeline is equipped with pigtail 12；It is equipped at the pigtail for managing
Interior gas-cooled subcooler 13；The pressure pipeline is additionally provided with pressurization control valve 14；The preceding analysis of pipeline and post analysis
Analysis valve 27 and post analysis valve 28 before pipeline is respectively equipped with.
The first constant temperature and pressure device 21 and the second constant temperature and pressure device 23 include that pressure reducing valve, heating element and temperature control
Device；The calculation formula of the practical leakage rate of measured valve 3 is preset in the analytical calculation unit 25, helium booster pump 11 is loaded into helium
The characteristic parameter of gas and the characteristic parameter for flowing through 3 medium of measured valve.
Embodiment 3
As shown in Fig. 2, on the basis of embodiment 1, valve leak amount detecting device further includes valve test pipeline assembly
With the reservoir 4 for storing cooling medium；Valve test pipeline assembly includes for pipeline before the valve of cooling medium to be connected
With pipeline after valve；Pipeline is sequentially turned on reservoir 4 and is connect after pipeline, measured valve 3, valve before the reservoir 4, valve, and shape
At closed circuit；The measured valve 3 is equipped with temperature sensor；Pipeline is additionally provided with for managing interior cooling medium drop before the valve
The cryogenic pump 5 of temperature；The gas-liquid separator 6 being connected to reservoir 4 is equipped in the arrival end of cryogenic pump 5；Pipeline and valve before the valve
Pipeline is respectively equipped with preceding choked flow valve 71 and rear choked flow valve 72 afterwards.
The preceding analysis of pipeline and the link position of 3 entrance end flanges of measured valve are located at the low of side valve door entrance end flanges
Place；The post analysis pipeline and the link position of 3 outlet end flange of measured valve are located at the height of 3 outlet end flange of measured valve
Place.
The cooling medium is liquid nitrogen.
Embodiment 4
The detection method of valve leak amount detecting device such as following steps:
S1, valve are cooling: measured valve 3 connected and flows through valve inner cold system inside measured valve 3 into cooling medium,
Valve inner cold system includes pipeline after pipeline and valve before valve, before pipeline is respectively equipped with after pipeline and valve before valve choked flow valve 71 and after
Choked flow valve 72 after measured valve 3 is cooled to temperature to be tested, then closes preceding choked flow valve 71, measured valve 3 with after respectively
Choked flow valve 72；
It is tested before S2, valve: importing the helium of set temperature and pressure, 3 arrival end of measured valve in 3 arrival end of measured valve
Helium and the cooling medium of gasification be mixed into mixed gas, the first constant temperature and pressure device 21 regulate and control mixed gas to set temperature and
After pressure, helium volume content r before valve is detectedHe1；
It is tested after valve: after the second constant temperature and pressure device 23 regulates and controls the outlet end gas to set temperature and pressure of measured valve 3,
Helium volume content r after detection valve respectivelyHe2With gas flow V after valvef2；
S3, leaking rate formulas: analytical calculation unit 25 surveys the intrinsic parameter of helium, the intrinsic parameter of cooling medium, step S2
Helium volume content r before the valve obtainedHe1, helium volume content r after valveHe2With gas flow V after valvef2It is calculated, is acquired tested
The leakage rate of valve 3.
Embodiment 5
On the basis of embodiment 4, leakage calculation formula is as follows: helium volume content before the valve of 3 entrance of measured valve
rHe1Calculation formula such as following formula (1):
Wherein, VHe1For the volume of helium before valve；V1For the volume total amount of mixed gas before valve；
The mass content X that helium before valve accounts for mixed gas is converted by formula (1)He1, formula (2) specific as follows:
Wherein, ρHe1For the density of helium before valve；ρ1For the density of mixed gas before valve；
Before valve, helium accounts for the mass content X of mixed gas after valveHe2Are as follows:
Wherein, rHe2For helium volume content after valve；ρHe2For the density of helium after valve；ρ2For the density of gas after valve；
The leakage volume V of helium after valveHe2Are as follows:
VHe2=rHe2Vf2 (4)
The leakage quality m of helium after valveHe2Are as follows:
mHe2=ρHe2VHe2 (5)
Wherein, rHe2For helium volume content after valve；Vf2For gas flow after valve；ρHe2For the density of helium after valve；
It, can be in the hope of the leakage gross mass m of measured valve 3 by above formulafWith the overall accumulated amount V of leakagef1It is as follows respectively:
Its above formula (6), (7) rightmost side rHe1、rHe2、Vf2It is to measure, ρHe2、ρ1、ρHe1It is close under corresponding states
Degree, for constant pressure at a temperature of, the density of the mixed gas of fixed proportion content is steady state value.
Embodiment of above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned implementation
Invention is explained in detail for mode, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are repaired
Change or replaces, the spirit and scope for each embodiment technical solution of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of valve leak amount detecting device, it is characterised in that: including helium booster pump (11) and leakage rate analyzer (2)；
Connection is connected with the flange of measured valve (3) arrival end by pressure pipeline in the helium booster pump (11)；
The leakage rate analyzer (2) includes the first constant temperature and pressure device (21), the first helium purity sensor (22), the second constant temperature perseverance
Depressor (23), the second helium purity sensor (24), analytical calculation unit (25) and flowmeter (26)；The first helium purity sensing
Device (22) is used to detect helium volume content before the valve in the mixed gas after first constant temperature and pressure device (21) temperature-control pressure-control；Institute
It states the second helium purity sensor (24) and is used to detect helium after the valve in the gas after second constant temperature and pressure device (23) temperature-control pressure-control
Air volume content；The flowmeter (26) is set to the exit of the second helium purity sensor (24), for detecting gas stream after valve
Amount；
The analytical calculation unit (25) is equipped with the first analysis port, the second analysis port and third analysis port；It is described tested
Valve (3) entrance end flanges, the first constant temperature and pressure device (21), the first helium purity sensor (22) are successively led by preceding analysis of pipeline
Lead to and connect, the first analysis port is connect by the first detection and control circuitry with the first helium purity sensor (22)；The measured valve (3)
Outlet end flange, the second constant temperature and pressure device (23), the second helium purity sensor (24) sequentially turn on connection by post analysis pipeline,
Second analysis port is connect by the second detection and control circuitry with the second helium purity sensor (24), and third analysis port passes through the
Three detection and control circuitries are connect with flowmeter (26).
2. valve leak amount detecting device according to claim 1, it is characterised in that: the pressure pipeline is equipped with helix tube
Section (12)；It is equipped at the pigtail for managing interior gas-cooled subcooler (13)；The pressure pipeline is additionally provided with pressurization
Control valve (14)；Analysis valve (27) and post analysis valve before the preceding analysis of pipeline and post analysis pipeline are respectively equipped with
(28)。
3. valve leak amount detecting device according to claim 1, it is characterised in that: the first constant temperature and pressure device (21)
It include pressure reducing valve, heating element and temperature controller with the second constant temperature and pressure device (23)；In the analytical calculation unit (25)
It is preset with the calculation formula of measured valve (3) practical leakage rate, helium booster pump (11) is loaded into the characteristic parameter of helium and flows through
The characteristic parameter of measured valve (3) medium.
4. valve leak amount detecting device according to claim 1, it is characterised in that: further include valve test pipeline assembly
With the reservoir (4) for storing cooling medium；The valve test pipeline assembly includes the valve front tube for cooling medium to be connected
Pipeline behind road and valve；Pipeline and reservoir (4) company of sequentially turning on after pipeline, measured valve (3), valve before the reservoir (4), valve
It connects, and forms closed circuit；The measured valve (3) is equipped with temperature sensor；Pipeline is additionally provided in managing before the valve
The cryogenic pump (5) of cooling medium cooling；The gas-liquid separator being connected to reservoir (4) is equipped in the arrival end of cryogenic pump (5)
(6)；Pipeline is respectively equipped with preceding choked flow valve (71) and rear choked flow valve (72) after the preceding pipeline of valve and valve.
5. valve leak amount detecting device according to claim 1, it is characterised in that: the preceding analysis of pipeline and tested valve
The link position of door (3) entrance end flanges is located at the lower of side valve door entrance end flanges；The post analysis pipeline and measured valve
(3) link position of outlet end flange is located at the eminence of measured valve (3) outlet end flange.
6. valve leak amount detecting device described in -5 any one according to claim 1, which is characterized in that the inspection of detection device
Survey method such as following steps:
S1, valve are cooling: measured valve (3) connected and flows through the internal valve inner cold system of measured valve (3) into cooling medium,
Valve inner cold system includes pipeline after pipeline and valve before valve, before pipeline is respectively equipped with after pipeline and valve before valve choked flow valve (71) and
Preceding choked flow valve (71), rear resistance after measured valve (3) is cooled to temperature to be tested, then are closed in choked flow valve (72) afterwards respectively
Flow valve (72) and measured valve (3)；
Tested before S2, valve: importing helium in measured valve (3) arrival end, the helium of measured valve (3) arrival end and gasification it is cold
But medium is mixed into mixed gas, after the first constant temperature and pressure device (21) regulates and controls mixed gas to set temperature and pressure, detects valve
Preceding helium volume content rHe1；
It is tested after valve: after the second constant temperature and pressure device (23) regulates and controls the outlet end gas to set temperature and pressure of measured valve (3),
Helium volume content r after detection valve respectivelyHe2With gas flow V after valvef2；
S3, leaking rate formulas: analytical calculation unit (25) measures the intrinsic parameter of helium, the intrinsic parameter of cooling medium, step S2
Valve before helium volume content rHe1, helium volume content r after valveHe2With gas flow V after valvef2It is calculated, acquires tested valve
The leakage rate of door (3).
7. valve leak amount detecting device according to claim 6, which is characterized in that leakage calculation formula is as follows:
Helium volume content r before the valve of measured valve (3) entranceHe1Calculation formula such as following formula (1):
Wherein, VHe1For the volume of helium before valve；V1For the volume total amount of mixed gas before valve；
The mass content X that helium before valve accounts for mixed gas is converted by formula (1)He1, formula (2) specific as follows:
Wherein, ρHe1For the density of helium before valve；ρ1For the density of mixed gas before valve；
It is equal to measured valve (3) entrance, helium accounts for the mass content X of mixed gas after the valve of measured valve (3) outletHe2Are as follows:
Wherein, rHe2For helium volume content after valve；ρHe2For the density of helium after valve；ρ2For the density of gas after valve；
The leakage volume V of helium after valveHe2Are as follows:
VHe2=rHe2Vf2 (4)
The leakage quality m of helium after valveHe2Are as follows:
mHe2=ρHe2VHe2 (5)
Wherein, rHe2For helium volume content after valve；Vf2For gas flow after valve；ρHe2For the density of helium after valve；
It, can be in the hope of the leakage gross mass m of measured valve (3) by above formulafWith the overall accumulated amount V of leakagef1It is as follows respectively:
8. valve leak amount detecting device according to claim 6, it is characterised in that: the cooling medium is liquid nitrogen.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112179578A (en) * | 2020-09-17 | 2021-01-05 | 西安航天动力研究所 | Tool and method for detecting leakage rate of diaphragm valve high-pressure helium mass spectrometer |
| CN114544097A (en) * | 2022-01-12 | 2022-05-27 | 合肥通用机械研究院有限公司 | Valve dispersion test device |
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