CN111024327A - Air tightness detection device with function of correcting self leakage and internal volume influence and detection method thereof - Google Patents
Air tightness detection device with function of correcting self leakage and internal volume influence and detection method thereof Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 14
- 239000007789 gas Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007405 data analysis Methods 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 208000032750 Device leakage Diseases 0.000 description 1
- 239000012491 analyte Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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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
- G01M3/007—Leak detector calibration, standard leaks
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Abstract
The invention provides an air tightness detection device with a function of correcting self leakage and internal volume influence and a detection method thereof, and belongs to the technical field of air tightness detection. The main technical scheme is as follows: the air tightness detection device with the function of correcting the self leakage and the influence of the internal volume comprises a fluid source, a control unit A, a metering unit, a control unit B and a boundary valve which are connected in sequence, wherein a flow bypass valve is connected between the control unit A and the control unit B; the control unit A controls the operation of the metering unit, the control unit B, the boundary area valve and the flow bypass valve, and the control unit B comprises one or more valves. The data obtained by the detection device is used for correcting the leakage data of the object to be detected, and whether the current leakage amount is suitable for the leakage detection of the object to be detected is evaluated. The invention requires less component resources, increased functionality, reduced cost, and reduced volume.
Description
Technical Field
The invention belongs to the technical field of air tightness detection, and particularly relates to an air tightness detection device with a function of correcting self leakage and internal volume influence and a detection method thereof.
Background
For the detection of air tightness, especially for the air tightness detection of the fuel cell stack assembly including the air tightness of the sealing member and the electrode plate, not only the leakage of the object to be tested is considered, but also the leakage of the testing device itself is corrected. Because the detection equipment is not absolutely sealed, certain leakage always occurs, and the measurement precision of the leakage amount of the target object is influenced to different degrees. Therefore, the leakage amount of the detection device itself needs to be detected to correct the leakage amount of the object to be detected. Meanwhile, the leakage of the object to be tested is generally very small, or the volume of the object to be tested is relatively small compared with the volume of the test process of the test device, and the leakage amount of the object to be tested is in a similar order of magnitude as the leakage amount of the test device, so that the leakage of the object to be tested is inevitably measured by using the device under the condition that the test device is approved to have certain leakage, and then the specific numerical value of the leakage amount of the device per se is deducted to obtain the corrected leakage amount data of the object to be tested.
One type of method for leak testing an object under test is to pressurize the object and then measure the fluid flow required to maintain that pressure. The method requires a set of detection devices to provide a fluid source, such as gas or liquid, to the object, and the process from the fluid source to the object requires a series of process equipment, such as pipes, control valves, pressure regulators, flow detectors, filters, and safety protection valves.
The small amount of leakage of the detection device itself may not be immediately detected, and if it relies on manual detection, it is time consuming, laborious and inconvenient. And the leakage amount of the testing device can be increased accidentally or slowly under the complex structure of the testing device or the comprehensive factors of long-term use or movement, vibration, sealing element failure and the like.
Disclosure of Invention
In view of the above problems, the present invention provides a method for measuring the air tightness of the object to be measured, i.e. the leakage amount under a specific pressure, the device can automatically and rapidly detect and evaluate the leakage condition of the device itself, determine the system stability time and the leakage amount to be deducted, and obtain data for correcting the leakage data of the object to be measured, including evaluating whether the current leakage amount is permitted by a certain test purpose. In particular, for flow method detection, the data of the flowmeter is leakage amount, and the data is corrected according to the leakage amount, whether an alarm is needed or not, the airtightness of the device is checked and maintained, and the like. The invention provides an air tightness detection device with a function of correcting self leakage and internal volume influence and a detection method thereof.
The technical scheme of the invention is as follows: the air tightness detection device with the function of correcting the self leakage and the influence of the internal volume comprises a fluid source, a control unit A, a metering unit, a control unit B and a boundary valve which are connected in sequence, wherein a flow bypass valve is connected between the control unit A and the control unit B; the control unit A controls the operation of the metering unit, the control unit B, the boundary area valve and the flow bypass valve.
Further, the control unit B comprises one or more valves.
The fluid source, inert gas or liquid, here exemplified as gas, is a compressed gas used for testing gas tightness.
The control unit A is a device control unit with computer for controlling gas pressure, on-off control of each valve body of the system and data processing, and controls the metering unit, the control unit B, the boundary area valve and the flow bypass valve. Volume of lumen V1The unit L; speed of leakage Q1Unit L/min; controlled fluid pressure P1In bar.
The metering unit is formed by connecting 1 flowmeter or a plurality of flowmeters in parallel, the plurality of flowmeters are used for expanding and forming a continuous flow measuring range, the measurement is controlled by a computer, wherein the selected standard of the minimum range flowmeter is that the lower detection limit is 10-50% of the allowable leakage amount of the object to be measured; the flow reading Q is measured in L/min.
The control unit B, a fluid control unit behind the flowmeter, can be 1 valve or a plurality of valve groups, communicates the flowmeter with the boundary area valve, and has an inner cavity volume V4The unit L; speed of leakage Q4In units of L/min.
And the boundary area valve is used as a connection interface between the test system and the object to be tested, and when the boundary area valve is closed, the system performs self-determination. The fluid can flow from the control unit B to the object to be measured through the boundary area valves in an unlimited direction according to the pipeline connection relation, and can flow in two directions and multiple ways, and the volumes of the inner cavities are V5The unit L; speed of leakage Q5In units of L/min.
Volume V of the cavity of the object to be measured6The unit L; speed of leakage Q6Unit L/min; allowable gas leakage speedDegree Q60In units of L/min.
And the flow bypass valve is parallel to the metering unit, and avoids the impact of a large amount of fluid on the flowmeter when a system is blown or an object to be tested is blown or the object to be tested is inflated. Volume V of lumen in object to be measured6Greater or test pressure P1When the size of the liquid is larger, the liquid is directly provided for the object to be measured, and the impact of a large amount of or high-speed liquid on the metering unit is avoided. The system measures and calculates the volume of the inner cavity and the leakage flow, the volume V of the inner cavity7The unit L; speed of leakage Q7In units of L/min.
The invention simultaneously requests to protect the method for detecting the air tightness detection device, and the method comprises the steps of detecting the air tightness detection device and detecting an object to be detected;
the step of detecting the air tightness detection device comprises the following steps: closing the boundary valve, and measuring the total flow V from normal pressure to test pressure0With time t, flow rate Q0(t) relationship: v0＝Q0(t); after reaching steady state, fitting the asymptote V2Obtaining the intercept VaPressure P1Lower self leakage velocity Q2：V2＝Va+Q2*t；
If self leakage velocity Q2If the leakage rate exceeds 50% of the allowable leakage rate of the object to be detected, alarming and informing to judge that the detection device is not suitable for the object to be detected; if self leakage velocity Q2And if the leakage rate is less than 50% of the allowable leakage rate of the object to be detected, detecting the object to be detected, wherein the detection steps are as follows:
opening the boundary valve to connect the air tightness detection device with the object to be tested from normal pressure to test pressure P1The metering unit will obtain the total flow V01With time t, flow rate Q01(t) relationship
V01＝Q01(t)
After reaching steady state, fitting the asymptote V21Obtaining the intercept Va1Pressure P1Lower overall leakage velocity Q21，
V21＝Va1+Q21*t，
Air leakage velocity Q of object to be measured6Is a pressure P1Lower overall leakage velocity Q21And self leakage velocity Q2Difference of difference
Q6＝Q21-Q2。
The invention has the following beneficial effects: the invention can automatically run according to a set program, quickly obtain the dead volume and leakage amount of the device per se, serve as correction data for the detection of the object to be detected, judge the normal balance time and reasonably evaluate the test. The increased self-leakage amount and dead volume data of the method provide a correction basis for the measurement range of the object to be measured, and prevent self-error interference and even provide unreasonable evaluation results. Particularly, when the leakage amount of the object to be tested is close to the leakage amount data of the test system, and the dead volume of the internal cavity of the object to be tested is small, the reliability of the test is evaluated. The system self leakage characteristic can be completed through automatic setting without manual testing, self faults are prevented, and if the leakage is large (including accidental connection loosening and air leakage which are difficult to perceive), the object to be tested is still tested. The detection device can automatically and quickly detect and evaluate the leakage condition of the hardware device of the system, and the obtained data is used for correcting the leakage data of the object to be detected and evaluating whether the current leakage amount is suitable for detecting the leakage of the object to be detected.
Besides obtaining the leakage data of the object to be tested, the internal cavity dead volume of the object to be tested can be obtained.
The system of the present invention requires reduced component resources, increased functionality, reduced cost, reduced volume, and provides practical advances in technology and application relative to several reference device systems.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a schematic diagram of data analysis of device leakage and internal cavity volume determination;
FIG. 3 is a schematic diagram of data analysis of analyte leakage and internal cavity volume determination;
wherein: 1. the device comprises a fluid source, 2, control units A and 3, a metering unit, 4, control units B and 5, a boundary area valve, 6, an object to be measured, 7 and a flow bypass valve.
Detailed Description
As shown in fig. 1 to 3, the air tightness detecting device with the function of correcting self leakage and internal volume influence comprises a fluid source 1, a control unit a2, a metering unit 3, a control unit B4 and a battery limit valve 5 which are connected in sequence, wherein a flow bypass valve 7 is connected between the control unit a2 and the control unit B4; the control unit A2 controls the operation of the metering unit 3, the control unit B4, the battery limit valve 5 and the flow bypass valve 7, and the control unit B4 comprises one or more valves.
The technical description is given by taking an inert gas medium as an example. Depending on the adsorption characteristics of the different fluids in the process and target vessel chambers, the fluids should be selected to be of a type having relatively small inert and adsorption characteristics. Under actual use pressure, the leakage and dead volume of the test system itself have a delay in filling the system under test with fluid after changing pressure, requiring a settling time, and must incorporate relevant corrections in the operational settings and analysis results.
The air tightness detection device is cleaned or blown by selected fluid without other interference substances.
The block valve 5 is closed and if the block valve 5 is a multi-valve block including a valve block port for returning the fluid from the test object 6 to the apparatus, the fluid flowing to the test object 6 is piped to the valve block of the return flow control unit B4 so that it can be filled with fluid as well and the amount of leakage from these return valve blocks and pipes is detected.
The flow meter 3 has a flow rate integrating function based on the flow rate Q measured by the measuring unit 3 at the fluid pressure P, and the control system also has an integration of the instantaneous flow rate data and obtains the gas flow rate volume number in a specific time period based on the integration of the flow rate.
The step of detecting the leakage characteristic of the air tightness detection device is as follows: the boundary area valve 5 is closed, and the metering unit 3 obtains the total flow V from the normal pressure to the testing pressure0With time t, flow rate Q0(t) relationship: v0＝Q0(t); after reaching steady state, fitting the asymptote V2Obtaining the intercept VaPressure P1Lower self leakage velocity Q2：V2＝Va+Q2*t；
If self leakage velocity Q2If the leakage rate exceeds 50% of the allowable leakage rate of the object to be detected 6, alarming and informing to judge that the detection device is not suitable for the object to be detected 6; if self leakage velocity Q2And if the leakage amount is less than 50% of the allowable leakage amount of the object to be detected 6, detecting the object to be detected 6.
Calculating and fitting an initial slope straight line to obtain the relation between the initial flow V' and the initial flow rate Q
V’＝Q’*t。
According to the initial flow V' and the fitting asymptote V2Intersection point, obtaining gas volume Va', equilibrium time (stabilization time) ta’
Va’＝Va*Q’/(Q’-Q2)
ta’＝Va/(Q’-Q2)
The volume Va ’Is the gas consumed to fill the volume of the internal cavity of the system itself, considered at P1Under pressure, to obtain a volume V of its own cavity, including the control unit B4Boundary valve and pipeline volume V thereof5Flow bypass valve and pipeline volume V thereof7The sum of the volumes is used for automatically calculating the pressurizing balance time of the object to be measured
(V4+V5+V7)＝Va’/P1
The method for measuring the leakage characteristic of the object to be measured comprises the following steps:
opening a boundary area valve 5, connecting the air tightness detection device with an object to be tested 6 from normal pressure to test pressure P1The metering unit 3 will obtain the total flow V01With time t, flow rate Q01(t) relationship
V01＝Q01(t)
After reaching steady state, fitting the asymptote V21Obtaining the intercept Va1Pressure P1Lower overall leakage velocity Q21，
V21＝Va1+Q21*t，
Air leakage velocity Q of object to be measured6Is a pressure P1Lower overall leakage velocity Q21And self leakage velocity Q2Difference of difference
Q6＝Q21-Q2。
Calculating a fitted initial slope straight line V1' with initial flow rate Q1’
V1’＝Q1’*t。
According to the fitted initial slope line V1' and fitting an asymptote V21Intersection point, obtaining gas volume Va1', equilibrium time (stabilization time) ta1’
Va1’＝Va1*Q1’/(Q1’-Q21)
ta1’＝Va1/(Q1’-Q21)
The volume Va ’Is the gas consumed by filling the inner cavity volume of the system, and the total inner cavity volume is obtained by considering the pressure
(V4+V5+V7)+V6＝Va1’/P1
Calculating to obtain the volume V of the object to be measured6
V6＝Va1’/P1-Va’/P1＝(Va1’-Va’)/P1
The above detection results in a pressure P1And after communicating the object to be detected, measuring the total leakage speed and the total internal volume, and deducting the influence of the system, thereby obtaining the actual detection data of the object to be detected. According to the accumulated measurement data, a reference balance time specification during automatic detection is made, and the test period is shortened. If the test period is exceeded, the balance is still not achieved, the leakage is considered to be over-index, and an alarm is given.
The self-data detection can be used for detecting and correcting the self-data periodically when continuously testing, such as a batch of objects to be tested on a production line.
In general, the data of the system itself is much smaller than the data to be measured. If the data is close to or larger than the data to be detected, for example, more than 50% of the data to be detected, an alarm is given to remind a person to confirm whether the object to be detected can be continuously monitored by using the detection device.
The foregoing examples are provided for illustration and description of the invention only and are not intended to limit the invention to the scope of the described examples. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed.
Claims (3)
1. The air tightness detection device with the function of correcting the self leakage and the influence of the internal volume is characterized by comprising a fluid source (1), a control unit A (2), a metering unit (3), a control unit B (4) and a boundary valve (5) which are sequentially connected, wherein a flow bypass valve (7) is connected between the control unit A (2) and the control unit B (4); the control unit A (2) controls the operation of the metering unit (3), the control unit B (4), the boundary area valve (5) and the flow bypass valve (7).
2. A method for detecting airtightness using the airtightness detection apparatus according to claim 1, wherein:
the method comprises the steps of detecting an air tightness detection device and detecting an object to be detected;
the step of detecting the air tightness detection device comprises the following steps: the boundary area valve (5) is closed, and the metering unit (3) obtains the total flow volume V from normal pressure to test pressure0With time t, flow rate Q0(t) relationship: v0＝Q0(t); after reaching steady state, fitting the asymptote V2Obtaining the intercept VaPressure P1Lower self leakage velocity Q2：V2＝Va+Q2*t；
If it leaks out at a certain rateDegree Q2If the leakage rate exceeds 50% of the allowable leakage rate of the object to be detected (6), alarming and informing to judge that the detection device is not suitable for the object to be detected (6); if self leakage velocity Q2And if the leakage rate is less than 50% of the allowable leakage rate of the object to be detected (6), detecting the object to be detected (6), wherein the detection steps are as follows:
opening a boundary area valve (5), connecting the air tightness detection device with an object to be tested (6), and testing pressure P from normal pressure1The metering unit (3) will obtain the total flow volume V01With time t, flow rate Q01(t) relationship
V01＝Q01(t)
After reaching steady state, fitting the asymptote V21Obtaining the intercept Va1Pressure P1Lower overall leakage velocity Q21，
V21＝Va1+Q21*t，
Air leakage velocity Q of object to be measured6Is a pressure P1Lower overall leakage velocity Q21And self leakage velocity Q2Difference of difference
Q6＝Q21-Q2。
3. The tightness detection device according to claim 1, characterized in that said control unit B (4) comprises one or more valves.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112304532A (en) * | 2020-11-27 | 2021-02-02 | 上海捷氢科技有限公司 | Fuel cell air tightness detection device and detection method |
| CN112484942A (en) * | 2020-11-30 | 2021-03-12 | 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 |
| CN113285094A (en) * | 2021-05-19 | 2021-08-20 | 大连锐格新能源科技有限公司 | System and method for improving gas flow control lag of fuel cell |
| DE102021124266A1 (en) | 2021-09-20 | 2023-03-23 | Dsg-Canusa Gmbh | Simplified leak test method for testing a test specimen for leaks |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006131312A1 (en) * | 2005-06-10 | 2006-12-14 | Testo Ag | Method for determining the total leak rate of systems impinged upon by pressure, and control apparatus for carrying out said method |
| CN205538126U (en) * | 2016-04-28 | 2016-08-31 | 慧感(上海)物联网科技有限公司 | Electronic device shell integrality detection device |
-
2019
- 2019-12-26 CN CN201911367686.7A patent/CN111024327B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006131312A1 (en) * | 2005-06-10 | 2006-12-14 | Testo Ag | Method for determining the total leak rate of systems impinged upon by pressure, and control apparatus for carrying out said method |
| CN205538126U (en) * | 2016-04-28 | 2016-08-31 | 慧感(上海)物联网科技有限公司 | Electronic device shell integrality detection device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112304532A (en) * | 2020-11-27 | 2021-02-02 | 上海捷氢科技有限公司 | Fuel cell air tightness detection device and detection method |
| CN112484942A (en) * | 2020-11-30 | 2021-03-12 | 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 |
| 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 |
| CN113285094A (en) * | 2021-05-19 | 2021-08-20 | 大连锐格新能源科技有限公司 | System and method for improving gas flow control lag of fuel cell |
| CN113285094B (en) * | 2021-05-19 | 2024-04-02 | 大连锐格新能源科技有限公司 | System and method for improving fuel cell gas flow control hysteresis |
| DE102021124266A1 (en) | 2021-09-20 | 2023-03-23 | Dsg-Canusa Gmbh | Simplified leak test method for testing a test specimen for leaks |
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Denomination of invention: Device and method for leak self inspection and leak detection of the tested object Granted publication date: 20210827 Pledgee: Huaxia Bank Co.,Ltd. Dalian Xinghai Plaza Branch Pledgor: DALIAN RIGOR NEW ENERGY TECHNOLOGY CO.,LTD. Registration number: Y2024980002472 |
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Address after: 3-1-2, Room 201, Building 5, Huashan Road Commercial Street, Longshan Street, Economic and Technological Development Zone, Wuhu City, Anhui Province Patentee after: Anhui Ruige New Energy Technology Co.,Ltd. Country or region after: China Address before: No. 777 Xin Cement Road, Xinzhaizi Street, Ganjingzi District, Dalian City, Liaoning Province Patentee before: DALIAN RIGOR NEW ENERGY TECHNOLOGY CO.,LTD. Country or region before: China |