CN111896191B - On-site calibration method and auxiliary calibration equipment for integral oil tank leakage detection equipment - Google Patents
On-site calibration method and auxiliary calibration equipment for integral oil tank leakage detection equipment Download PDFInfo
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- CN111896191B CN111896191B CN202010544930.9A CN202010544930A CN111896191B CN 111896191 B CN111896191 B CN 111896191B CN 202010544930 A CN202010544930 A CN 202010544930A CN 111896191 B CN111896191 B CN 111896191B
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- 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
- G01M3/202—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 using mass spectrometer detection systems
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Abstract
The invention provides a field calibration method for leakage detection equipment of an integral oil tank and auxiliary calibration equipment thereof, wherein the invention arranges the auxiliary calibration equipment and uses a reference value of the auxiliary calibration equipment to be 3.3 multiplied by 10‑2 Pa•m3Standard leak and reference value of 1X 10/s‑5 Pa•m3The leakage rate calibration method has the advantages that the/s standard leakage hole is used as a metering reference, the output leakage rate value of the overall leakage rate detection function of the integral oil tank leakage detection equipment and the output leakage rate value of the single-point leakage point helium mass spectrum detection are calibrated, the leakage rate calibration of the overall leakage rate detection function is realized, the output leakage rate value of the single-point leakage point helium mass spectrum detection is comprehensively calibrated, the working efficiency is improved by 10 times compared with the traditional separation type disassembly calibration method, the labor intensity is reduced, the human error is reduced, and the operation is simple and convenient.
Description
Technical Field
The invention belongs to the field of airtight leakage detection, and particularly relates to a field calibration method and auxiliary calibration equipment for leakage detection equipment of an integral oil tank.
Background
The air-tight leakage detection is applied to a plurality of industrial fields of aerospace, aviation, weapons, automobiles, semiconductors, gas appliances, medical treatment and the like. The traditional airtight leakage detection technology based on a pressure method comprises a direct pressure drop method (coarse leakage detection) and an oil-tight experiment (fine leakage detection), and is developed to a helium mass spectrometry based differential pressure contrast method (coarse leakage detection) and a helium mass spectrometry (fine leakage detection), wherein the measurement error of the differential pressure contrast method can reach 0.5%, the measurement accuracy is higher, and the helium mass spectrometry can detect a tiny leakage point.
The oil tank leak detection is an important link for aircraft manufacturing, and tiny leakage can cause great hidden dangers to the flight safety of the aircraft, and accurate leak detection is required. The traditional leak detection method is to put the oil tank component into liquid and adopt a bubble method for inspection, the method can only carry out qualitative inspection, can not carry out quantitative inspection on a leakage value and can not carry out inspection on a tiny leakage amount, and the helium mass spectrum leak detection method can realize the inspection on the tiny leakage. The oil density inspection can only qualitatively judge whether leakage exists or not, the influence of artificial subjective factors is large, the differential pressure method can effectively eliminate the influence of deformation, temperature change and the like of a measured object on detection, and data are objective and reliable.
The overall oil tank leakage detection equipment needs 2-5 hours for coarse leakage detection, the leakage detection time is determined according to the number of rivets, and the leakage detection time is much faster than that of an oil seal experiment. The equipment judges according to the judgment standard preset by the quality control department, thereby realizing quantitative leak detection, and the leak detection is basically free from the influence of human factors, so the detection result is more objective. The detection medium is air or nitrogen or helium, aviation kerosene is not used, and the environment and the working site are not polluted in the detection process.
The integral oil tank leakage detection device is based on a helium mass spectrum leakage detection method, adopts a differential pressure leakage detection technology and a helium mass spectrum leakage detection technology, and generally comprises an automatic continuous gas distribution system, a differential pressure leakage detection system and a helium mass spectrum leakage detection system as shown in figure 1, and is provided with a plurality of measuring instruments such as pressure sensors, flowmeters, temperature sensors, helium mass spectrum leakage detectors and the like, so that high-precision tracer gas is provided for leakage detection. The leakage detection work relates to two aspects, namely the detection of the total leakage rate of the whole oil tank and the detection of a single-point leakage source of the whole oil tank, and the leakage source is required to be positioned and the leakage rate of the leakage source is required to be detected so as to carry out leakage repairing and subsequent leakage detection tests.
At present, no means for integrally calibrating the whole oil tank leakage detection equipment exists, and the traditional measurement and guarantee means is a quantity value tracing mode in which a pressure sensor, a flow sensor, a temperature sensor and a helium mass spectrometer leakage detector which are used on the equipment are disassembled and respectively calibrated in an off-line mode. The equipment has a complex structure, and the sensors adopt PLC to control sampling, so that the system leakage is easily caused by the disassembly, and the sealing property and the safety of the system are influenced.
The integral oil tank leakage detection equipment provides helium-air or helium-nitrogen mixed gas with different concentration ratios, is used as mixed tracer gas for leakage detection, is special test equipment for outputting comprehensive parameters, and is required to be comprehensively calibrated according to actual use states. The existing metering mode only carries out metering control on metering devices used on equipment respectively, and does not carry out integral calibration on the final output leakage rate value of the equipment.
The quantity value guarantee of the whole oil tank leakage detection equipment becomes the bottleneck of the use of the equipment, and a field calibration scheme needs to be designed to realize the whole calibration of the equipment.
Disclosure of Invention
The invention provides a field calibration method and auxiliary calibration equipment for integral oil tank leakage detection equipment, aiming at the blank of the prior art in the aspect of integral calibration of the final output leakage rate of the integral oil tank leakage detection equipment.
The specific implementation content of the invention is as follows:
the invention provides a field calibration method for leakage detection equipment of an integral oil tank, which is used for realizing the field calibration of the leakage detection equipment of the integral oil tank based on auxiliary calibration equipment, and the reference value of the auxiliary calibration equipment is 3.3 multiplied by 10-2 Pa•m3Standard leak and reference value of 1X 10/s-5 Pa•m3And (3) calibrating the output leakage rate value of the overall leakage rate detection function of the integral oil tank leakage detection equipment and the single-point leakage point helium mass spectrum detection by using the/s standard leakage hole as a measurement reference.
In order to better implement the present invention, further, the calibration operation first needs to perform gas distribution; the specific operation of the gas distribution is as follows: and connecting the third flange to an inflation test port of the integral oil tank leakage detection equipment, then opening the first valve, closing the second valve, the third valve and the fourth valve, and starting the integral oil tank leakage detection equipment to distribute mixed gas of helium and air to obtain helium with the distribution pressure of 100 kPa and the proportion concentration of 10%.
In order to better realize the method, after the air distribution of the whole oil tank leakage detection equipment is finished, the air distribution pressure value P1 displayed by the whole oil tank leakage detection equipment is read, the indication value P0 of a digital pressure gauge is read, and the air distribution pressure indication error delta P is calculated, wherein the value of the air distribution pressure indication error delta P is equal to the air distribution pressure value P1 minus the indication value P0 of the air distribution pressure value P1.
In order to better implement the invention, further, after the air distribution pressure indication error delta P is obtained through calculation, the first valve is closed, the fourth valve is opened, and the helium mass spectrometer leak detector suction gun is used for detecting the reference value of 1 multiplied by 10-5 Pa•m3The leakage rate value H1 of the/s standard leak hole is recorded, and the leakage rate value H1 is recorded; closing the fourth valve, opening the third valve, and detecting the reference value of 1 × 10 with a suction gun of the helium mass spectrometer leak detector-5 Pa•m3The leak rate value of the standard leak hole is measured in/s, and the leak rate value H2 is recorded.
In order to better implement the invention, further, after the leakage rate values H1 and H2 are calculated, the difference Δ H between the leakage rate values H1 and H2 is further calculated, and the value of Δ H is equal to the leakage rate value H2 minus the leakage rate value H1.
In order to better realize the invention, the output leakage rate value indication error delta H is further input into a helium mass spectrometer leak detector calibration program of the integral oil tank leak detection equipment, and the measurement result of the helium leakage rate is subjected to migration correction to complete the integral calibration of the output leakage rate value of the integral oil tank leak detection equipment.
In order to better implement the invention, further, the first valve, the third valve and the fourth valve are closed, the second valve is opened, and according to the inflation time x seconds, the inflation balance time y seconds, the detection balance time z seconds, the detection time a seconds and the exhaust time b seconds after detection when the whole oil tank leakage detection device is in the actual use state, the detection beat of the whole oil tank leakage detection device is set as follows: charge = x s, balance 1= y s, balance 2= z s, test = a s, exhaust = b s, with the operations of pressurization, balance, test, and exhaust being performed in sequence.
In order to better implement the invention, after the operations of pressurization, balance, detection and exhaust are carried out, the leakage quantity Q of the whole oil tank leakage detection equipment is converted into the differential pressure change value delta p through the conversion relation between the leakage quantity Q and the differential pressure change value delta p, so that a theoretical value D0 of the differential pressure change value delta p and a detection value D1 of the differential pressure change value delta p during actual detection are obtained.
In order to better realize the invention, further, after a detection value D1 and a theoretical value D0 are obtained, a differential pressure detection value indicating error delta D is calculated, and the differential pressure detection value indicating error delta D is equal to the difference between the detection value D1 and D0; and the differential pressure detection value indication error delta D is used for calibrating the leakage quantity Q of the whole oil tank leakage detection equipment in the actual use state.
The invention also provides auxiliary calibration equipment for field calibration of the integral oil tank leakage detection equipment, which is used for field calibration of the integral oil tank leakage detection equipment and comprises a connecting pipeline and a corrugated hose; the connecting pipeline comprises a transverse pipe, and a first vertical pipe, a second vertical pipe and a third vertical pipe which are connected to the pipe body of the transverse pipe;
the left end port and the right end port of the corrugated hose are respectively provided with a third flange and a second flange; the end, which is not connected with the right port of the corrugated hose, of the second flange is also connected with the left port of the transverse pipe; the end, which is not connected with the left port of the corrugated hose, of the third flange is also connected with an inflation test port of the integral oil tank leakage detection equipment;
the first vertical pipe is arranged at the left section of the pipe body of the transverse pipe, and a digital pressure gauge is arranged at one end, which is not connected with the transverse pipe, of the first vertical pipe; a first valve for controlling the opening and closing of the first vertical pipe is arranged on the first vertical pipe;
the second vertical pipe is arranged at the middle section of the pipe body of the transverse pipe, and the reference value of 3.3 multiplied by 10 is arranged at one end of the second vertical pipe, which is not connected with the transverse pipe-2 Pa•m3A/s standard leak; the reference value is 3.3 × 10-2 Pa•m3The/s standard leak hole is connected with a helium mass spectrometer leak detector suction gun of the integral oil tank leak detection equipment; a second valve for controlling the opening and closing of the second vertical pipe is arranged on the second vertical pipe;
the third vertical pipe is arranged at the right section of the pipe body of the transverse pipe, and a reference value of 1 multiplied by 10 is arranged at one end of the third vertical pipe, which is not connected with the transverse pipe-5 Pa•m3A/s standard leak; a fourth valve is arranged on the transverse pipe body and positioned between the mounting positions of the second vertical pipe and the third vertical pipe;
a reference tank is arranged at the right end of the transverse pipe; a first flange is arranged on the pipe body of the transverse pipe and positioned between the mounting position of the third vertical pipe and the reference tank; and a third valve is arranged between the first flange and the reference tank on the pipe body of the transverse pipe.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the method for calibrating the final output leak rate of the integral oil tank leak detection equipment in the aspect of integral calibration is provided;
(2) compared with the traditional separation type disassembling and calibrating method, the working efficiency is improved by 10 times, the labor intensity can be reduced, the human error is reduced, and the operation is simple and convenient.
Drawings
FIG. 1 is a schematic structural diagram of an integral fuel tank leak detection device;
fig. 2 is a schematic diagram of the connection of the overall leak detection apparatus to the auxiliary calibration apparatus of the present invention during actual calibration.
Wherein: 1. digital pressure gauge, 2, reference value 3.3 × 10-2 Pa•m3Standard leak of/s, 3, reference value 1X 10-5 Pa•m3A/s standard leak hole, 4, a reference tank, 5, a first valve, 6, a second valve, 7, a third valve, 8, a fourth valve, 9, a first flange, 10, a second flange, 11, a third flange, 12, a corrugated hose, 13, an inflation test port, 14, integral oil tank leak detection equipment, 15 and a helium mass spectrometer leak detector suction gun.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the invention provides a field calibration method for integral oil tank leakage detection equipment, which is used for realizing the field calibration of the integral oil tank leakage detection equipment 14 based on auxiliary calibration equipment, and the reference value of the auxiliary calibration equipment is 3.3 multiplied by 10-2 Pa•m3Standard leak 2 and reference value 1X 10-5 Pa•m3The/s standard leak hole 3 is used as a measuring reference to calibrate the total leak quantity detection function of the integral oil tank leak detection equipment 14 and the output leak rate value of single-point leak helium mass spectrum detection; the method comprises the following specific steps:
step 1, firstly, gas distribution is required; the specific operation of the gas distribution is as follows: and connecting the third flange 11 to an inflation test port 13 of the integral oil tank leakage detection device 14, then opening the first valve 5, closing the second valve 6, the third valve 7 and the fourth valve 8, and starting the integral oil tank leakage detection device 14 to distribute mixed gas of helium and air to obtain helium with the distribution pressure of 100 kPa and the mixture ratio of 10% concentration.
And 2, after the air distribution of the integral oil tank leakage detection device 14 is finished, reading an air distribution pressure value P1 displayed by the integral oil tank leakage detection device 14, reading an indication value P0 of the digital pressure gauge 1, and calculating an air distribution pressure indication error delta P, wherein the value of the air distribution pressure indication error delta P is equal to the air distribution pressure value P1 minus the indication value P0 of the air distribution pressure value P1. At the moment, according to different detection requirements, the method is divided into A: integral calibration of the output leak rate value of the integral tank leak detection device 14, B: the leakage quantity Q of the whole oil tank leakage detection device 14 in the actual use state is calibrated in two conditions:
in case A, in step 3, after the indication error delta P of the gas distribution pressure is obtained through calculation, the first valve 5 is closed, the fourth valve 8 is opened, and the reference value 1 multiplied by 10 is detected by a helium mass spectrometer leak detector suction gun 15-5 Pa•m3The leakage rate value H1 of the standard leak hole 3 is recorded, and the leakage rate value H1 is recorded; the fourth valve 8 is closed, the third valve 7 is opened, and the reference value 1X 10 is detected by a helium mass spectrometer leak detector suction gun 15-5 Pa•m3The leak rate value of the standard leak hole 3 was measured in/s, and the leak rate value H2 was recorded.
And 4, after the leakage rate value H1 and the leakage rate value H2 are calculated, further calculating the difference value delta H between the leakage rate value H1 and the leakage rate value H2, wherein the value of delta H is equal to the value obtained by subtracting the leakage rate value H1 from the leakage rate value H2.
And 5, inputting the output leak rate value indication error delta H into a helium mass spectrometer leak detector calibration program of the integral oil tank leak detection device 14, and performing migration correction on the measurement result of the helium leak rate to finish integral calibration of the output leak rate value of the integral oil tank leak detection device 14.
In case of the condition B, in step 3, after the air distribution pressure indication error Δ P is obtained through calculation, the first valve 5, the third valve 7, and the fourth valve 8 are closed, the second valve 6 is opened, and according to the inflation time 100 seconds, the inflation balance time 100 seconds, the detection balance time 30 seconds, the detection time 30 seconds, and the exhaust time 60 seconds after detection in the actual use state of the whole tank leak detection device 14, the detection beat of the whole tank leak detection device 14 is set to be: charge =100 s, balance 1=100 s, balance 2=30 s, test =30 s, exhaust =60 s, and the pressurization, balance, test, and exhaust operations are performed in that order.
And 4, after pressurization, balance, detection and exhaust operations are carried out, converting the leakage quantity Q of the integral oil tank leakage detection equipment 14 into a differential pressure change value delta p through the conversion relation between the leakage quantity Q and the differential pressure change value delta p, and thus obtaining a theoretical value D0 of the differential pressure change value delta p and a detection value D1 of the differential pressure change value delta p during actual detection. The specific conversion relationship is Q =60 v.Δ p/(p0.t), where Q = leakage (measurement unit: pa.m)3S), V = sealed pressure system equivalent internal volume (units of measure: m is3) Δ p = differential pressure value (measurement unit: pa), p0= atmospheric pressure (unit of measurement: pa), t = detection time (unit of measurement: s). As calculated for theoretical value D0: the leakage rate of the standard leak hole is known to be 3.3 multiplied by 10 of the reference value Q measured by the metering mechanism-2 Pa•m3And/s, the volume L of a pipeline from the output end of the differential pressure leakage detection system of the measurement leakage detection device to an inflation test port of the leakage detection device is 1.65L, and the leakage detection time t is set to be 10 s. The theoretical differential pressure value D0 converted at a leak detection time of 10 s was 200 Pa.
Example 2:
the invention also provides an auxiliary calibration device for field calibration of the integral oil tank leakage detection device, which is used for field calibration of the integral oil tank leakage detection device 14 and comprises a connecting pipeline, a corrugated hose 12 and a calibration device, wherein the connecting pipeline is connected with the corrugated hose 12; the connecting pipeline comprises a transverse pipe, and a first vertical pipe, a second vertical pipe and a third vertical pipe which are connected to the pipe body of the transverse pipe;
the left end port and the right end port of the corrugated hose 12 are respectively provided with a third flange 11 and a second flange 10; the end of the second flange 10, which is not connected with the right port of the corrugated hose 13, is also connected with the left port of the transverse pipe; the end, which is not connected with the left port of the corrugated hose 13, of the third flange 11 is also connected with an inflation test port 13 of an integral oil tank leakage detection device 14;
the first vertical pipe is arranged at the left section of the pipe body of the transverse pipe, and a digital pressure gauge 1 is arranged at one end, which is not connected with the transverse pipe, of the first vertical pipe; a first valve 5 for controlling the opening and closing of the first vertical pipe is arranged on the first vertical pipe;
the second vertical pipe is arranged at the middle section of the pipe body of the transverse pipe, and the reference value of 3.3 multiplied by 10 is arranged at one end of the second vertical pipe, which is not connected with the transverse pipe-2 Pa•m3A/s standard leak hole 2; the reference value is 3.3 × 10-2 Pa•m3The/s standard leak hole 2 is connected with a helium mass spectrometer leak detector suction gun 15 of the integral oil tank leak detection device 14; a second valve 6 for controlling the opening and closing of the second vertical pipe is arranged on the second vertical pipe;
the third vertical pipe is arranged at the right section of the pipe body of the transverse pipe, and a reference value of 1 multiplied by 10 is arranged at one end of the third vertical pipe, which is not connected with the transverse pipe-5 Pa•m3A/s standard leak hole 3; a fourth valve 8 is arranged on the transverse pipe body between the mounting positions of the second vertical pipe and the third vertical pipe;
a reference tank 4 is arranged at the right end of the transverse pipe; a first flange 9 is arranged on the pipe body of the transverse pipe and positioned between the mounting position of the third vertical pipe and the reference tank 4; and a third valve 7 is arranged on the pipe body of the transverse pipe at a position between the first flange 9 and the reference tank 4.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. A method for on-site calibration of integral fuel tank leakage detection equipment is characterized in that the reference value of auxiliary calibration equipment is 3.3 multiplied by 10, and the reference value of the auxiliary calibration equipment is used-2 Pa•m3A/s standard leak (2) and a reference value of 1X 10-5 Pa•m3The/s standard leak hole (3) is used as a metering reference to calibrate the total leak quantity detection function of the whole oil tank leak detection equipment (14) and the output leak rate value of single-point leak point helium mass spectrum detection;
the auxiliary calibration device comprises a connecting pipeline and a corrugated hose (12); the connecting pipeline comprises a transverse pipe, and a first vertical pipe, a second vertical pipe and a third vertical pipe which are connected to the pipe body of the transverse pipe;
the left end port and the right end port of the corrugated hose (12) are respectively provided with a third flange (11) and a second flange (10); one end of the second flange (10), which is not connected with the right port of the corrugated hose (13), is also connected with the left port of the transverse pipe; one end of the third flange (11), which is not connected with the left port of the corrugated hose (13), is also connected with an inflation test port (13) of the integral oil tank leakage detection equipment (14);
the first vertical pipe is arranged at the left section of the pipe body of the transverse pipe, and a digital pressure gauge (1) is arranged at one end, which is not connected with the transverse pipe, of the first vertical pipe; a first valve (5) for controlling the opening and closing of the first vertical pipe is arranged on the first vertical pipe;
the second vertical pipe is arranged at the middle section of the pipe body of the transverse pipe, and the reference value of 3.3 multiplied by 10 is arranged at one end of the second vertical pipe, which is not connected with the transverse pipe-2 Pa•m3A/s standard leak hole (2); the referenceValue 3.3X 10-2 Pa•m3The/s standard leak hole (2) is connected with a helium mass spectrometer leak detector suction gun (15) of the integral oil tank leak detection equipment (14); a second valve (6) for controlling the opening and closing of the second vertical pipe is arranged on the second vertical pipe;
the third vertical pipe is arranged at the right section of the pipe body of the transverse pipe, and a reference value of 1 multiplied by 10 is arranged at one end of the third vertical pipe, which is not connected with the transverse pipe-5 Pa•m3A/s standard leak hole (3); a fourth valve (8) is arranged on the transverse pipe body and positioned between the mounting positions of the second vertical pipe and the third vertical pipe;
a reference tank (4) is arranged at the right end of the transverse pipe; a first flange (9) is arranged on the pipe body of the transverse pipe and positioned between the mounting position of the third vertical pipe and the reference tank (4); and a third valve (7) is arranged between the first flange (9) and the reference tank (4) on the pipe body of the transverse pipe.
2. The method for field calibration of the leak detection equipment of the integral oil tank as claimed in claim 1, wherein the calibration operation firstly needs to be performed for air distribution; the specific operation of the gas distribution is as follows: and (3) connecting a third flange (11) to an inflation test port (13) of integral oil tank leakage detection equipment (14), then opening a first valve (5), closing a second valve (6), a third valve (7) and a fourth valve (8), and starting the integral oil tank leakage detection equipment (14) to distribute mixed gas of helium and air to obtain distribution pressure of 100 kPa and helium with the concentration of 10%.
3. The on-site calibration method for the integral fuel tank leakage detection device is characterized in that after the air distribution of the integral fuel tank leakage detection device (14) is completed, the air distribution pressure value P1 displayed by the integral fuel tank leakage detection device (14) is read, the indication value P0 of the digital pressure gauge (1) is read, and the air distribution pressure indication error delta P is calculated, wherein the value of the air distribution pressure indication error delta P is equal to the air distribution pressure value P1 and the air distribution pressure value P1 minus the indication value P0.
4. An integral fuel tank test as claimed in claim 3The on-site calibration method of the leak equipment is characterized in that after the indication error delta P of the distribution pressure is obtained through calculation, the first valve (5) is closed, the fourth valve (8) is opened, and a helium mass spectrometer leak detector suction gun (15) is used for detecting a reference value of 1 multiplied by 10-5 Pa•m3The leakage rate value H1 of the/s standard leak hole (3) is recorded, and the leakage rate value H1 is recorded; closing the fourth valve (8), opening the third valve (7), and detecting the reference value of 1 × 10 with a helium mass spectrometer leak detector suction gun (15)-5 Pa•m3The leak rate value of the standard leak hole (3) was measured in/s, and the leak rate value H2 was recorded.
5. The method for field calibration of the leak detection equipment of the integral fuel tank as claimed in claim 4, wherein after the leak rate values H1 and H2 are calculated, the difference Δ H between the leak rate values H1 and H2 is further calculated, and the value of Δ H is equal to the leak rate value H2 minus the leak rate value H1.
6. The on-site calibration method for the integral fuel tank leak detection device, as set forth in claim 5, characterized in that the output leak rate value indication error Δ H is input into a helium mass spectrometer leak detector calibration program of the integral fuel tank leak detection device (14), and the measurement result of the helium leak rate is subjected to migration correction to complete the integral calibration of the output leak rate value of the integral fuel tank leak detection device (14).
7. The on-site calibration method for the integral fuel tank leakage detection device, as set forth in claim 3, is characterized in that after the air distribution pressure indication error Δ P is calculated, the first valve (5), the third valve (7), the fourth valve (8) are closed, the second valve (6) is opened, and according to the inflation time x seconds, the inflation balance time y seconds, the detection balance time z seconds, the detection time a seconds and the exhaust time b seconds after detection when the integral fuel tank leakage detection device (14) is actually used, the detection beat of the integral fuel tank leakage detection device (14) is set as follows: charge = x s, balance 1= y s, balance 2= z s, test = a s, exhaust = b s, with the operations of pressurization, balance, test, and exhaust being performed in sequence.
8. The method for on-site calibration of the integral tank leak detection device according to claim 7, wherein the leak quantity Q of the integral tank leak detection device (14) is converted into the differential pressure change value Δ p by the conversion relationship between the leak quantity Q and the differential pressure change value Δ p after the pressurization, the balance, the detection, and the air release operations, thereby obtaining the theoretical value D0 of the differential pressure change value Δ p and the detection value D1 of the differential pressure change value Δ p at the time of actual detection.
9. The method for field calibration of leak detection equipment of an integral fuel tank as claimed in claim 8, wherein after obtaining the detection value D1 and the theoretical value D0, a differential pressure detection value indication error Δ D is calculated, wherein the differential pressure detection value indication error Δ D is equal to the detection value D1 minus D0; the differential pressure detection value indication error Delta D is used for calibrating the leakage quantity Q of the whole oil tank leakage detecting device (14) under the actual use state.
10. An auxiliary calibration device for field calibration of an integral fuel tank leakage detection device is used for field calibration of the integral fuel tank leakage detection device (14), and is characterized by comprising a connecting pipeline and a corrugated hose (12); the connecting pipeline comprises a transverse pipe, and a first vertical pipe, a second vertical pipe and a third vertical pipe which are connected to the pipe body of the transverse pipe;
the left end port and the right end port of the corrugated hose (12) are respectively provided with a third flange (11) and a second flange (10); one end of the second flange (10), which is not connected with the right port of the corrugated hose (13), is also connected with the left port of the transverse pipe; one end of the third flange (11), which is not connected with the left port of the corrugated hose (13), is also connected with an inflation test port (13) of the integral oil tank leakage detection equipment (14);
the first vertical pipe is arranged at the left section of the pipe body of the transverse pipe, and a digital pressure gauge (1) is arranged at one end, which is not connected with the transverse pipe, of the first vertical pipe; a first valve (5) for controlling the opening and closing of the first vertical pipe is arranged on the first vertical pipe;
the second vertical pipe is arranged at the middle section of the pipe body of the transverse pipe, and the reference value of 3.3 multiplied by 10 is arranged at one end of the second vertical pipe, which is not connected with the transverse pipe-2 Pa•m3A/s standard leak hole (2); the reference value is 3.3 × 10-2 Pa•m3The/s standard leak hole (2) is connected with a helium mass spectrometer leak detector suction gun (15) of the integral oil tank leak detection equipment (14); a second valve (6) for controlling the opening and closing of the second vertical pipe is arranged on the second vertical pipe;
the third vertical pipe is arranged at the right section of the pipe body of the transverse pipe, and a reference value of 1 multiplied by 10 is arranged at one end of the third vertical pipe, which is not connected with the transverse pipe-5 Pa•m3A/s standard leak hole (3); a fourth valve (8) is arranged on the transverse pipe body and positioned between the mounting positions of the second vertical pipe and the third vertical pipe;
a reference tank (4) is arranged at the right end of the transverse pipe; a first flange (9) is arranged on the pipe body of the transverse pipe and positioned between the mounting position of the third vertical pipe and the reference tank (4); and a third valve (7) is arranged between the first flange (9) and the reference tank (4) on the pipe body of the transverse pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010544930.9A CN111896191B (en) | 2020-06-15 | 2020-06-15 | On-site calibration method and auxiliary calibration equipment for integral oil tank leakage detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010544930.9A CN111896191B (en) | 2020-06-15 | 2020-06-15 | On-site calibration method and auxiliary calibration equipment for integral oil tank leakage detection equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111896191A CN111896191A (en) | 2020-11-06 |
| CN111896191B true CN111896191B (en) | 2021-11-30 |
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