CN111458081A - Dynamic helium mass spectrum leak detection airtightness test method and device for GI L bus - Google Patents
Dynamic helium mass spectrum leak detection airtightness test method and device for GI L bus Download PDFInfo
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- CN111458081A CN111458081A CN201910056688.8A CN201910056688A CN111458081A CN 111458081 A CN111458081 A CN 111458081A CN 201910056688 A CN201910056688 A CN 201910056688A CN 111458081 A CN111458081 A CN 111458081A
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- mass spectrometer
- helium mass
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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
- G01M3/221—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 cables
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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
- G01M3/202—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
Abstract
The invention discloses a method for testing gas tightness of a dynamic helium mass spectrum leakage detection of a hard buckle cover for a GI L bus, which comprises the steps of 1) installing two GI L units in a butt joint mode to form a GI L bus, installing the hard buckle cover at the position where a flange is connected, and enabling the buckle cover and the GI L bus to enclose a flange accommodating cavity, 2) calibrating a mass spectrum leakage detector communicated with the flange accommodating cavity, judging whether deviation of a calibration value is not larger than a first preset value or not, and entering a step 3 when the judgment result is yes, 3) vacuumizing the GI L bus to be lower than a first preset pressure value and then filling helium with rated pressure into the GI L bus, and 4) utilizing the helium mass spectrum leakage detector to detect leakage rate of a sealing surface at the flange connecting position of two GI L units, so that a user can calculate the whole leakage rate of the GI L bus.
Description
Technical Field
The invention relates to the technical field of electrical transmission, in particular to a dynamic helium mass spectrum leak detection and air tightness test method for a GI L bus and a dynamic helium mass spectrum leak detection and air tightness test device for a GI L bus.
Background
GI L is a gas insulated metal closed power transmission line, a plurality of GI L units are connected and installed in sequence to form a GI L bus, and in practical application, SF filled in the GI L bus6The gas amount can reach about 750t at most, and a small amount of gas leakage can cause system failure, environmental pollution and even personal injury and death.
In the prior art, when the leakage rate of the GI L is detected, a vacuum box needs to be prepared, the GI L unit is placed in the vacuum box, the box bodies of the GI L unit and the vacuum box are simultaneously vacuumized, helium gas is filled into the GI L unit, and the number of helium gas molecules leaking into the vacuum box is monitored by using a helium mass spectrometer leak detection device, so that the leakage rate of the GI L unit is accurately measured.
However, the test method can only detect the leakage rate of one GI L cell, and cannot detect the leakage rate at the joint sealing surface of two 18 meter long GI L cells.
In summary, how to detect the leakage rate at the connection sealing surface of two 18 meter long GI L units and how to use the helium mass spectrometer leak detection method without preparing a large vacuum box is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a dynamic helium mass spectrum leak detection airtightness test method for a GI L bus, which can detect the leakage rate of the sealing surface at the flange joint of two GI L units with the length of 18 meters.
In order to achieve the purpose, the invention provides the following technical scheme:
a dynamic helium mass spectrum leak detection airtightness test method for a GI L bus comprises the following steps:
1) two GI L units are butted and mounted to form a GI L bus, a fastening cover is additionally arranged at the flange connection position of the two GI L units, and the fastening cover and the two GI L units enclose a flange cavity;
2) calibrating the mass spectrometer leak detector communicated with the flange cavity, judging whether the deviation of the calibration value is not greater than a first preset value, and entering the step 3 when the judgment result is yes);
3) vacuumizing the GI L bus to be below a first preset pressure value, and then filling helium with rated pressure into the GI L bus;
4) and detecting leakage by using the helium mass spectrometer leak detector.
Preferably, in the method for leak tightness test of GI L bus by dynamic helium mass spectrometry, step 2) includes:
21) enabling the helium mass spectrometer leak detector to be communicated with the flange cavity, reading a background value of the helium mass spectrometer leak detector, and performing subsequent steps when the background value is not greater than a second preset value;
22) and vacuumizing the flange containing cavity, and opening a standard leak hole arranged on the buckle cover for calibration when the pressure of the flange containing cavity is below a second preset pressure value.
Preferably, in the method for leak tightness test of dynamic helium mass spectrometer leak detection for GI L bus bar, the first preset value is 10%.
Preferably, in the method for leak tightness test of dynamic helium mass spectrometer leak detection for GI L bus bar, the first preset pressure value is 300 Pa.
Preferably, in the method for leak detection and airtightness testing of a GI L bus by dynamic helium mass spectrometry, the step 4) is specifically:
turning on a starting button of the helium mass spectrometer leak detector, and respectively recording the vacuum degrees and the leak rates when the time for turning on the starting button is 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes and 30 minutes;
and after the leak rate value is stable, reading a leak detection result, and closing the starting button.
Preferably, in the method for leak tightness test of GI L bus by dynamic helium mass spectrometer, after step 4), the method further includes:
5) recovering helium from the GI L busbar.
A dynamic helium mass spectrum leak detection airtightness test device for a GI L bus applies any one of the above technical schemes to a dynamic helium mass spectrum leak detection airtightness test method for a GI L bus, and comprises the following steps:
the hard buckle cover is used for being buckled at the connecting flanges of the two GI L units and enclosing a flange cavity with the two GI L units;
the helium mass spectrometer leak detector is communicated with the flange cavity;
the auxiliary vacuum pump is communicated with the flange cavity;
the standard leak hole is arranged on the buckle cover and is communicated with the flange containing cavity;
and the air charging and discharging device is used for exhausting and charging air to the GI L bus formed by butting and mounting the two GI L units.
Preferably, in the above dynamic helium mass spectrometer leak detection airtightness testing apparatus for the GI L bus, the helium mass spectrometer leak detector and the auxiliary vacuum pump are respectively communicated with the flange cavity through a high-strength gas path.
Preferably, in the above dynamic helium mass spectrometer leak detection airtightness test apparatus for the GI L bus, the high-strength gas path includes a trunk section and two branch sections respectively communicated with the trunk section, a free end of the trunk section is assembled to the buckle cover and communicated with the flange cavity, a valve is provided on the first branch section, an end of the first branch section is communicated with the helium mass spectrometer leak detector, a valve is provided on the second branch section, and an end of the second branch section is communicated with the auxiliary vacuum pump.
The invention provides a dynamic helium mass spectrum leak detection airtightness test method for a GI L bus, which comprises the steps of 1) butt-joint installation of two GI L units to form a GI L bus, and installation of a buckle cover at the flange joint of the GI L unit and the buckle cover, wherein the buckle cover and the two GI L units enclose a flange cavity, 2) calibration of a mass spectrum leak detector communicated with the flange cavity, judgment of whether deviation of a calibration value is not larger than a first preset value or not, and entering step 3 when the judgment result is yes, 3) vacuumizing the GI L bus to be smaller than the first preset pressure value, and then filling helium with rated pressure into the GI L bus, and 4) leak detection by using the helium mass spectrum leak detector.
The dynamic helium mass spectrum leak detection airtightness test method for the GI L bus can detect the leakage rate at the sealing surface of the flange joint of two GI L units, and is convenient for a user to calculate the overall leakage rate of the whole GI L bus.
The invention also provides a dynamic helium mass spectrum leak detection and air tightness test device for the GI L bus, which applies the dynamic helium mass spectrum leak detection and air tightness test method for the GI L bus and fills the gap that the leakage rate of the sealing surface at the flange connection part of two GI L units with the length of 18 meters cannot be detected in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a dynamic helium mass spectrometer leak detection airtightness test method for a GI L bus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dynamic helium mass spectrometer leak detection airtightness testing apparatus for a GI L bus according to an embodiment of the present invention during calibration;
fig. 3 is a schematic structural diagram of a dynamic helium mass spectrometer leak detection airtightness testing apparatus for a GI L bus according to an embodiment of the present invention during leak detection;
wherein, in fig. 2-3:
a buckle closure 101, a standard leak hole 102, a helium mass spectrometer leak detector 103, an auxiliary vacuum pump 105, a GI L bus 105 and a gas charging and discharging device 106.
Detailed Description
The embodiment of the invention discloses a dynamic helium mass spectrum leak detection airtightness test method for a GI L bus, which can detect the leak rate of the sealing surface at the flange joint of two GI L units.
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 is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, an embodiment of the present invention provides a method for leak tightness test of GI L bus by dynamic helium mass spectrometry, including:
1) two GI L units are butted and mounted to form a GI L bus, a fastening cover is additionally arranged at the flange connection position of the two GI L units, and the fastening cover and the two GI L units enclose a flange cavity;
the buckling cover is a constant volume hard buckling cover, all gaps on the buckling cover need to be sealed so as to seal the flange containing cavity, and particularly, sealing gaskets can be arranged at all the gaps;
the method also comprises the steps that components used in the test method are connected through a gas path, specifically, the buckling cover is connected with the vacuumizing component and the helium mass spectrometer leak detector through the gas path, and the gas charging and discharging device is communicated with the GI L bus through the gas path;
2) calibrating a mass spectrometer leak detector communicated with the flange cavity, judging whether deviation of a calibration value is not greater than a first preset value, and entering step 3 if the judgment result is yes);
the first preset value is set to 10%;
3) vacuumizing the GI L bus to be below a first preset pressure value, and then filling helium with rated pressure into the GI L bus;
the first preset pressure value was set to 300Pa as above;
4) detecting leakage by using a helium mass spectrometer leak detector;
the step 4) is specifically as follows: starting a starting button of the helium mass spectrometer leak detector, and respectively recording the vacuum degree and the leakage rate at 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes and 30 minutes by taking the time for starting the starting button as starting time;
and after the leakage rate value is stable (within 10%), reading a leakage detection result, and closing a starting button.
In the method for leak tightness test of dynamic helium mass spectrometer leak detection of GI L busbar provided in the above embodiment, step 2) includes:
21) enabling the helium mass spectrometer leak detector to be communicated with the flange cavity, reading a background value of the helium mass spectrometer leak detector, and performing subsequent steps when the background value is not greater than a second preset value;
the second preset value is set to 1 x 10-7Pa.m3If the background value is larger than the second preset value, the sealing effect of the buckle cover is poor, and the buckle cover needs to be sealed again;
22) vacuumizing the flange containing cavity, and opening a standard leak hole arranged on the buckle cover for calibration when the pressure reaches below a second preset pressure value;
the deviation of the calibration value obtained in the step is stabilized within 10%, if the deviation exceeds the range, the leakage rate at the GI L unit cannot be accurately measured, and the second preset pressure value is set to be 10 Pa.
In order to save helium, the step 4) is followed by 5) recovering helium in the GI L bus.
The specific step 2) is used for testing the sensitivity of the mass spectrometer leak detector, and the testing process is as follows:
① reading the background value I of the leak detector with the calibration valve closed in a mass spectrometer leak detector0And noise value In；
② opening the calibration valve, and detecting the reaction value I of the helium mass spectrometer leak detector when the output value of the leak detector is stable1；
③ closing the calibration valve;
④ leak detection sensitivity is calculated according to equation (1)
As in equation (1) above:
Qeminleak detection sensitivity, Pa · m3/s；
InNoise or minimum readable signal of the leak detector, Pa · m3(ii) s or other relative units;
I1-calibrating the steady reaction value, Pa · m, of the leak detector after the leak has been opened3(ii) s or other relative units;
I0background value, Pa.m3(ii) s or other relative units;
Qs-calibrating the calibration value of the leak, Pa · m3/s。
The calculation of the leak rate is determined according to equation (2):
in equation (2):
q-leakage rate of test piece, Pa.m3/s；
Gamma-helium concentration.
The dynamic helium mass spectrometer leak detection airtightness test method for the GI L bus bar, provided by the embodiment, can detect the leakage rate at the sealing surface of the flange joint of two GI L units GI L units, and is convenient for a user to calculate the overall leakage rate of the whole GI L bus bar.
In addition, in the dynamic helium mass spectrometer leak detection airtightness test method for the GI L bus bar provided by this embodiment, it is not necessary to place the GI L bus bar in a vacuum box as a whole, and the leak rate can be accurately measured by helium mass spectrometer vacuum leak detection only by partially covering the sealing surfaces of the GI L units of the two GI L units and dynamically vacuumizing to below 10Pa, so that the vacuum box is omitted, and cost reduction is facilitated.
Furthermore, compared to conventional SF6The bundling method, the method provided by the embodiment, can be vacuumized, the detection precision is high, the hard buckle cover in the test method can be vacuumized, and the background leakage rate can reach 1 × 10-7Pa.m3S; the test method adopts the mode that the standard leak hole is arranged on the hard buckle cover for calibration, thereby ensuring the accuracy of the test leak rate measurement. The test method is dynamic vacuum pumping, and a positive pressure method is adopted for helium mass spectrum leak detection.
The embodiment of the invention also provides a dynamic helium mass spectrum leak detection and air tightness test device for the GI L bus, which applies the dynamic helium mass spectrum leak detection and air tightness test method for the GI L bus provided by the embodiment and comprises the following steps:
the buckling cover is buckled at the connecting flanges of the two GI L units and forms a flange cavity together with the two GI L units;
the helium mass spectrometer leak detector is only used for being communicated with the flange cavity;
the auxiliary vacuum pump is used for being communicated with the flange cavity;
the standard leak hole is arranged on the buckle cover and is communicated with the flange accommodating cavity;
the gas charging and discharging device is used for sucking and charging the GI L bus formed by butt joint of the two GI L units, and can suck vacuum to the GI L bus, charge helium into the GI L bus and suck the helium in the GI L bus for recovery as required.
In the test device, the helium mass spectrometer leak detector and the auxiliary vacuum pump are respectively communicated with the flange cavity through the high-strength gas path. The high-strength gas circuit comprises a main section and two branch sections which are respectively communicated with the main section, and the free end of the main section is assembled on the buckle cover and is communicated with the flange containing cavity; the valve is arranged on the first branch section, the end of the first branch section is communicated with the helium mass spectrometer leak detector, the valve is arranged on the second branch section, and the end of the second branch section is communicated with the auxiliary vacuum pump.
The dynamic helium mass spectrometer leak detection airtightness test device for the GI L bus provided in this embodiment applies the above dynamic helium mass spectrometer leak detection airtightness test method for the GI L bus, fills a blank that leakage rate detection cannot be performed on a sealing surface at a flange connection of a GI L unit in the prior art, and can perform helium mass spectrometer leak detection on the GI L bus without preparing a large vacuum box.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A dynamic helium mass spectrum leak detection airtightness test method for a GI L bus is characterized by comprising the following steps:
1) two GI L units are butted and mounted to form a GI L bus, a fastening cover is additionally arranged at the flange connection position of the two GI L units, and the fastening cover and the two GI L units enclose a flange cavity;
2) calibrating the mass spectrometer leak detector communicated with the flange cavity, judging whether the deviation of the calibration value is not greater than a first preset value, and entering the step 3 when the judgment result is yes);
3) vacuumizing the GI L bus to be below a first preset pressure value, and then filling helium with rated pressure into the GI L bus;
4) and detecting leakage by using the helium mass spectrometer leak detector.
2. The method of dynamic helium mass spectrometer leak detection tightness test of GI L bus of claim 1, wherein said step 2) comprises:
21) enabling the helium mass spectrometer leak detector to be communicated with the flange cavity, reading a background value of the helium mass spectrometer leak detector, and performing subsequent steps when the background value is not greater than a second preset value;
22) and vacuumizing the flange containing cavity, and opening a standard leak hole arranged on the buckle cover for calibration when the pressure of the flange containing cavity is below a second preset pressure value.
3. The method of dynamic helium mass spectrometer leak detection tightness test of GI L bus of claim 1, wherein the first preset value is 10%.
4. The method of dynamic helium mass spectrometer leak detection tightness test of GI L bus bar of claim 1, wherein the first predetermined pressure value is 300 Pa.
5. The method for dynamic helium mass spectrometer leak detection tightness test of GI L bus bar according to claim 1, wherein the step 4) is specifically:
turning on a starting button of the helium mass spectrometer leak detector, and respectively recording the vacuum degrees and the leak rates when the time for turning on the starting button is 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes and 30 minutes;
and after the leak rate value is stable, reading a leak detection result, and closing the starting button.
6. The method of dynamic helium mass spectrometer leak detection tightness test of GI L bus bar of claim 1, further comprising after step 4):
5) recovering helium from the GI L busbar.
7. A dynamic helium mass spectrometer leak detection airtightness test device for GI L bus bar, characterized in that, the dynamic helium mass spectrometer leak detection airtightness test method for GI L bus bar of any one of claims 1-6 is applied, including:
the hard buckle cover is used for being buckled at the connecting flanges of the two GI L units and enclosing a flange cavity with the two GI L units;
the helium mass spectrometer leak detector is communicated with the flange cavity;
the auxiliary vacuum pump is communicated with the flange cavity;
the standard leak hole is arranged on the hard buckle cover and is communicated with the flange containing cavity;
and the air charging and discharging device is used for exhausting and charging air to the GI L bus formed by butting and mounting the two GI L units.
8. The dynamic helium mass spectrometer leak detection tightness test device of GI L bus bar of claim 7, wherein the helium mass spectrometer leak detector and the auxiliary vacuum pump are respectively communicated with the flange cavity through high intensity gas path.
9. The apparatus of claim 8, wherein the high-strength gas path comprises a trunk section and two branch sections respectively communicated with the trunk section, the trunk section has a free end assembled to the hard cover and communicated with the flange cavity, the first branch section is provided with a valve, an end of the first branch section is communicated with the helium mass spectrometer, the second branch section is provided with a valve, and an end of the second branch section is communicated with the auxiliary vacuum pump.
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| CN111458081B (en) | 2022-06-17 |
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Address after: 710000 No. 18, north section of West 2nd Ring Road, Lianhu District, Xi'an City, Shaanxi Province Applicant after: Xi'an High Voltage Electrical Apparatus Research Institute Co.,Ltd. Applicant after: CHINA XD ELECTRIC Co.,Ltd. Applicant after: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. Address before: No.18, north section of West 2nd Ring Road, Lianhu District, Xi'an City, Shaanxi Province, 710077 Applicant before: XI'AN HIGH VOLTAGE APPARATUS RESEARCH INSTITUTE Co.,Ltd. Applicant before: CHINA XD ELECTRIC Co.,Ltd. Applicant before: STATE GRID SHANGHAI MUNICIPAL ELECTRIC POWER Co. |
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