CN110411663A - A kind of SF6Micro constant pressure Leaking Simulation devices and methods therefor - Google Patents
A kind of SF6Micro constant pressure Leaking Simulation devices and methods therefor Download PDFInfo
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- CN110411663A CN110411663A CN201910771765.8A CN201910771765A CN110411663A CN 110411663 A CN110411663 A CN 110411663A CN 201910771765 A CN201910771765 A CN 201910771765A CN 110411663 A CN110411663 A CN 110411663A
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- 238000004088 simulation Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005273 aeration Methods 0.000 claims abstract description 12
- 230000033001 locomotion Effects 0.000 claims abstract description 8
- 230000013011 mating Effects 0.000 claims abstract description 4
- 239000011148 porous material Substances 0.000 claims description 6
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 3
- 229910018503 SF6 Inorganic materials 0.000 description 34
- 238000012360 testing method Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000006837 decompression Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 2
- 229960000909 sulfur hexafluoride Drugs 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- WRQGPGZATPOHHX-UHFFFAOYSA-N ethyl 2-oxohexanoate Chemical compound CCCCC(=O)C(=O)OCC WRQGPGZATPOHHX-UHFFFAOYSA-N 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011005 laboratory method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Abstract
The invention discloses a kind of SF6Micro constant pressure Leaking Simulation device, it include cylinder, the mating piston being set in cylinder and the driving device to drive piston motion, the air inlet pipeline of cylinder is equipped with pressure reducing valve and aeration valve, the end of the outlet pipe of cylinder is equipped with experimental box body, experimental box body is equipped with leak and discharges the relief valve of gas to control leak, and the pipeline of cylinder or cylinder is equipped with the temperature sensor of the temperature of the gas in the pipeline to measure cylinder and cylinder.SF provided by the invention6Micro constant pressure Leaking Simulation device, realizes the SF of different pressures6Pure gas micro-leakage and SF6Micro constant pressure Leaking Simulation, structure is simple, and control is easy, and error is small, reproducible, can export quantifiable slip.The present invention also provides a kind of SF6Micro constant pressure Leaking Simulation method, uses SF6Micro constant pressure Leaking Simulation device, realizes the SF of different pressures6Pure gas micro-leakage emulation and SF6Micro constant pressure Leaking Simulation.
Description
Technical field
The present invention relates to electrical equipment technical field more particularly to a kind of SF6Micro constant pressure Leaking Simulation device and its side
Method.
Background technique
Sulfur hexafluoride (SF6) leak detection work is for maintaining insulation of electrical installation performance, ensureing equipment and power grid security, surely
Fixed, green operation aspect has important role.The 12.0.14 articles of GB 50150-2016 " electrical equipment commissioning test standard "
Regulation: " it is not less than 1 × 10 using sensitivity-6The leak detector of (volume ratio) to each sealing position of breaker, pipe joint etc. into
When row detection, leak detector should not alarm ".SF6Gas quantifying leak detector and SF6Gas imaging leak detector lacks feasible laboratory
Method of calibration guarantees SF the main reason is that lacking6The method of micro-leakage simulator constant pressure leakage.
Existing micro-gas leakage method has: mass flow control methods and positive pressure leak hole method etc..Mass flow control methods are
Control SF6The thinner ratio of calibrating gas and air exports the SF of different flow6It is letting out for normal pressure state with the mixed gas of air
Leakage, can not simulated high-pressure electrical equipment SF6The leakage situation with pressure of pure gas.Positive pressure leak hole method be by unstripped gas under a certain pressure
It is discharged after referance leak, controls its leakage rate, the gas that this method is controlled by controlling the pressure of unstripped gas
Body volume is obvious by pressure variations influence, higher to the required precision of pressure control；And multi-stage pressure regulating valve regulation pressure need to be used,
The degree of automation is low, and control is complicated, is inevitably generated manual operation error, poor repeatability, and can not output quantization let out
Leak rate.
Summary of the invention
Against the above deficiency, the present invention provides a kind of SF6Micro constant pressure Leaking Simulation device, the SF of analog different pressures6
Pure gas micro-leakage, also may be implemented SF6Micro constant pressure Leaking Simulation.The present invention also provides a kind of SF6Micro constant pressure Leaking Simulation
Method uses SF6Micro constant pressure Leaking Simulation device, to realize the SF of above-mentioned different pressures6The emulation of pure gas micro-leakage and
SF6Micro constant pressure Leaking Simulation.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
A kind of SF6Micro constant pressure Leaking Simulation device, include cylinder, the mating piston being set in the cylinder and
To drive the driving device of the piston motion, the air inlet pipeline of the cylinder is equipped with pressure reducing valve and aeration valve, the gas
The end of the outlet pipe of cylinder is equipped with experimental box body, and the experimental box body is equipped with leak and to control leak release
The pipeline of the relief valve of gas, the cylinder or the cylinder is equipped in the pipeline to measure cylinder and the cylinder
The temperature sensor of the temperature of gas.
Further, the leak on the experimental box body is multiple, and the aperture of each leak is different.
Preferably, the leak on the experimental box body is 3, and pore size is respectively 1.2mm, 2.5mm, 4.6mm.
Further, the pipeline of the cylinder or the cylinder is equipped with the pipeline to measure cylinder and the cylinder
The pressure sensor of the pressure of interior gas.
Further, the driving device is linear stepping motor or hydraulic cylinder or pneumatic cylinder.
Further, SF6Micro constant pressure Leaking Simulation device further includes having a single-chip computer control system, the single-chip microcontroller control
System processed is connect with temperature sensor, pressure sensor and driving device respectively.
The present invention also provides a kind of SF6Micro constant pressure Leaking Simulation method, uses above-mentioned SF6Micro constant pressure Leaking Simulation dress
It sets, includes following steps:
The S1 tonifying Qi stage: the air inlet pipeline of cylinder is connected into external air source, adjustment pressure reducing valve to default outlet pressure, closure
Relief valve opens aeration valve, and driving device drives piston toward movement outside until being full of SF in cylinder6Gas, closure, which is closed, mends
Air valve；
The S2 pressure regulation stage: measuring gas temperature by temperature sensor, according to SF under certain temperature6The pressure of gas with it is close
Degree relationship calculates the distance of the advance of piston needed for being adjusted to goal pressure, and driving device pushes piston to move in cylinder,
To adjust SF6Gas pressure is to target value；
S3 constant pressure leaks the stage: opening relief valve, SF6Gas is discharged by leak, and driving device at the uniform velocity propelling piston is protected
It holds inner pressure of air cylinder to stablize in target pressure value, to realize that constant pressure leaks.
Further, SF under certain temperature6The pressure and density relationship of gas are obtained by following formula:
P=56.2 × 10-6γT(1+B)-γ2A
In formula: A=74.9 × 10-6(1-0.727×10-3γ)；
B=2.51 × 10-3γ(1-0.846×10-3γ)；
P-gas pressure, unit are MPa (absolute pressure)；
γ-gas density, unit kg/m3；
T-gas thermodynamic temperature, unit K.
Further, driving device realizes that the constant pressure under different pressure is let out by different speed at the uniform velocity propelling piston
Leakage.
Compared with prior art, the beneficial effects of the present invention are:
1, SF provided by the invention6Micro constant pressure Leaking Simulation device, realizes the SF of different pressures6Pure gas micro-leakage
And SF6Micro constant pressure Leaking Simulation, structure is simple, and control is easy, and error is small, reproducible, can export quantifiable let out
Leak rate；
2, SF provided by the invention6Micro constant pressure Leaking Simulation device also is used as the examination of various gas leakage detection instruments
The quasi- occurring source of standard inspection；
3, SF provided by the invention6Micro constant pressure Leaking Simulation method, uses SF6Micro constant pressure Leaking Simulation device is realized
The SF of different pressures6Pure gas micro-leakage emulation and SF6Micro constant pressure Leaking Simulation.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described.
Fig. 1 is SF of the present invention6The structural schematic diagram of micro constant pressure Leaking Simulation device；
Fig. 2 is SF under certain temperature in the present invention6The pressure and density relationship curve figure of gas；
Fig. 3 is that SF of the present invention is used under different leak apertures6Micro constant pressure Leaking Simulation device and method obtains each
Set pressure and slip graph of relation.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, the present invention provides a kind of SF6Micro constant pressure Leaking Simulation device includes cylinder 3, mating setting
Decompression is equipped in the air inlet pipeline 31 of the piston 2 in cylinder 3 and the driving device 1 to drive piston 2 to move, cylinder 3
Valve 4 and aeration valve 5, the end of the outlet pipe 32 of cylinder 3 are equipped with experimental box body 8, and experimental box body 8 is equipped with leak and use
To control the relief valve 6 of leak release gas, the pipeline of cylinder 3 or cylinder 3 is equipped with to measure cylinder 3 and cylinder 3
Pipeline in gas temperature temperature sensor 7.
In a preferred embodiment, for driving device 1 preferably using linear stepping motor or hydraulic cylinder or pneumatic cylinder, this is excellent
In the embodiment of choosing, it is preferable to use linear stepping motor, linear stepping motors to operate the piston 2 that can drive cylinder 3 for driving device 1
Do straight reciprocating motion.
Cylinder 3 is configured with pipeline (air inlet pipeline 31 and outlet pipe 32), and pipeline usesThe pipeline of bore, in pipeline
Diameter is smaller, and inner space volume is smaller.
In this preferred embodiment, aeration valve 5 is located between 3 entrance of pressure reducing valve 4 and cylinder, and close from 3 entrance of cylinder.
Experimental box body 8 is also close from 3 entrance of cylinder, and experimental box body 8 is equipped with leak, and the outlet pipe 32 of cylinder 3 enters experimental box
Body 8, and it is directly connected to leak, relief valve 6 is mounted in experimental box body 8, on the outlet pipe 32 of cylinder 3, by releasing
The unlatching for putting valve 6 can control leak release gas.In a preferred embodiment, the leak on experimental box body 8 is multiple,
And the aperture of each leak is different, specially the leak on experimental box body 8 is 3, pore size be respectively 1.2mm,
2.5mm, 4.6mm, each leak is equipped with a relief valve 6 so that the control of each leak release gas is can be mutual
It is independent.Pressure reducing valve 4, aeration valve 5 and relief valve 6 are solenoid valve or motor-driven valve.
Temperature sensor 7 is located on the pipeline of cylinder 3 temperature of the gas in the pipeline to measure cylinder 3 and cylinder 3,
Temperature sensor 7 is preferably using square shell patch type PT100 platinum resistance sensor.
In a preferred embodiment, the pipeline of cylinder 3 is equipped with the gas in the pipeline to measure cylinder 3 and cylinder 3
Pressure pressure sensor 9, it is preferable to use the PMS type gas pressure sensors of SETech for pressure sensor 9.Using decompression
When valve 4 is inflated into cylinder 3, the pre- of pressure reducing valve 4 that the initial gas pressure in theoretical upper cylinder 3 when gassy is equal to setting is set out
Mouth pressure, but be to be able to carry out real-time monitoring, and the gas pressure in real-time acquisition, correction subsequent operation in cylinder 3
Power, therefore the gas pressure in preferably one pressure sensor 9 of setting each stage in real-time monitoring cylinder 3.
And in the preferred embodiment of part, it is automatically controlled to realize, a set of single-chip computer control system can be introduced, it is single
Piece machine control system can be used single-chip computer control system commonly used in the prior art, single-chip computer control system respectively with temperature sensing
Device 7, pressure sensor 9 and driving device 1 connect.After introducing single-chip computer control system, gas that temperature sensor 7 detects
Temperature, the gas pressure that pressure sensor 9 detects can be transmitted in single-chip computer control system, single-chip computer control system according to
The information received, to control driving device 1, by control driving device 1 and changes driving device in conjunction with preset relative program
The speed that 1 driving piston 2 moves, to change the air pressure in cylinder 3.
Use above-mentioned SF6Micro constant pressure Leaking Simulation device carries out SF6The method of micro constant pressure Leaking Simulation, include with
Lower step:
The S1 tonifying Qi stage: connecting external air source for the air inlet pipeline 31 of cylinder 3, adjustment pressure reducing valve 4 to default outlet pressure,
It is closed relief valve 6, opens aeration valve 5, driving device 1 drives piston 2 toward movement outside until being full of SF in cylinder6Gas closes
It closes and closes aeration valve 5.
In this preferred embodiment, air inlet pipeline 31 connects SF6Pure gas cylinder, pressure reducing valve 4 export initial pressure and are
The SF of 0.2MPa (absolute pressure)6Gas, opens aeration valve 5, and linear stepping motor pulls back piston 2 directly by rotating backward
SF is full of in cylinder 36Gas, at this point, setting the initial pressure of cylinder as P0If cylinder volume is initial volume V0。
The S2 pressure regulation stage: gas temperature is measured by temperature sensor 7, according to SF under certain temperature6The pressure of gas with
Density relationship, calculates the distance of the advance of piston 2 needed for being adjusted to goal pressure, and driving device 1 pushes piston 2 in cylinder 3
In move, to adjust SF6Gas pressure is to target value.
In the present embodiment, SF6Gas temperature temperature sensor measurement.Gas pressure is logical in common GIS electrical equipment
It is often 0.4~0.8MPa, the SF in pressure regulation stage6Pressure limit selects 0.4MPa~0.8MPa in the pressure and density relationship of gas
Range (pressure of gas in Simulated GlS electrical equipment).
SF under certain temperature6The pressure and density relationship of gas are obtained by following formula:
P=56.2 × 10-6γT(1+B)-γ2A (1)
In formula: A=74.9 × 10-6(1-0.727×10-3γ)；
B=2.51 × 10-3γ(1-0.846×10-3γ)；
P-gas pressure, unit are MPa (absolute pressure)；
γ-gas density, unit kg/m3；
T-gas thermodynamic temperature, unit K.
It according to formula (1), obtains in the pressure limit, the relation curve of gas pressure and density under different temperatures, such as Fig. 2 institute
Show.From figure 2 it can be seen that one timing of temperature, gas pressure and density are in a linear relationship, and linearly dependent coefficient is higher than 0.999.
For gas pressure and density relationship curve when 20 DEG C, fitting obtains linear equation (2), linearly dependent coefficient
It is 0.9996.
P=0.0139 γ+0.0479 (2)
The relationship of gas density and volume is shown in formula (3),
γ=m/V (3)
In formula: m-gaseous mass, unit kg；
V-gas volume, unit m3。
It brings formula (3) into formula (2) to obtain under same temperature, the relational expression (4) of gas pressure and volume.
P=0.0139m/V+0.0479 (4)
Initial pressure is P after inflation in cylinder 30, volume V0.Gaseous mass is constant, when pressure is extremely in cylinder 3 to be adjusted
Set pressure P1When, the gas volume V in cylinder 3 at this time1It is obtained by formula (5).
V1=V0(P0-0.0479)/(P1-0.0479) (5)
At this point, the distance l that driving device 1 (being linear stepping motor in this preferred embodiment) pushes piston 2 to advance1It is logical
Cross formula (6) acquisition.
l1=(V0-V1)/(πr2) (6)
In formula: the radius of 3 inner wall of r-cylinder, unit m.
S3 constant pressure leaks the stage: opening relief valve 6, SF6Gas is discharged by leak, the at the uniform velocity propelling piston 2 of driving device 1
Pressure in cylinder 3 is kept to stablize in target pressure value, to realize that constant pressure leaks.
Released gas rate can be demarcated by slip caliberating device, and slip caliberating device generally comprises calibration tooling, mark
Quasi- glass metrology pipette (metering mark, range 0.2mL, 2mL etc.), stopwatch etc., can calibrated leakage rate range: 0.001mL/s
~1mL/s.Liquid soap is added in normal glass metering pipette and forms soap-film, SF6Micro constant pressure Leaking Simulation device is released
The SF put6When gas flows into glass metrology pipette, soap-film is pushed to move in glass metrology pipette, the distance of movement is
For the volume of gas leakage, leaked gas volume within a certain period of time is measured, formula (7) is brought into, its slip value can be obtained.
V=Lt10-6 (7)
In formula: V-gas leakage volume, unit m3；
L-slip, unit mL/s；
T-leak time, unit s.
In SF6In gas leakage process, if 1 stop motion of driving device namely piston 2 stop moving into cylinder 3, companion
As gas leaks, the pressure in cylinder 3 can be reduced.In order to keep pressure in cylinder 3 to stablize in setting pressure P1, driving device
1 need to continue to push 2 forward travel of piston.
The leakage volume that slip caliberating device measures is the leakage volume under atmospheric pressure, can be scaled referring to formula (5)
Set pressure P1When leakage volume, obtain formula (8).
V1=V (Pa-0.0479)/(P1-0.0479) (8)
In formula: Pa- atmospheric pressure, unit MPa.
At this point, obtaining the distance l that driving device 1 need to push piston 2 to advance2Are as follows:
l2=Lt10-6(Pa-0.0479)/(P1-0.0479)/(πr2) (9)
By formula (9) it is found that the propulsion rate (advance distance that l/t, l refer to piston) of piston 2 and slip (L) and setting are pressed
Power (P1) related.When pressure is certain in cylinder 3, the released gas rate of fixed leak release is certain, so, driving device 1 is driven
The propulsion rate of piston 2 is also definite value.That is, pressure in cylinder 3 can be kept constant when driving device 1 at the uniform velocity pushes piston 2,
Certain released gas rate is corresponded at this time, and therefore, the at the uniform velocity propelling piston 2 of driving device 1 can keep pressure in cylinder 3 to stablize
Target pressure value, to realize that constant pressure leaks.Change the fltting speed that driving device 1 drives piston 2, i.e., in changeable cylinder 3
Pressure, namely when driving device 1 is by different speed at the uniform velocity propelling pistons 2, it can be achieved that constant pressure under different pressure
Leakage.
In a kind of specific implementation, driving device 1 at the uniform velocity pushes piston 2, discharges SF by leak6Gas, in room temperature
Under the conditions of, SF is tested using slip caliberating device6Slip of the micro constant pressure Leaking Simulation device under 0.8MPa pressure, lets out
Leak hole diameter is 1.2mm, and test result is shown in Table 1.
1 slip caliberating device test result of table
As shown in Table 1, the slip result of 6 measurements is almost the same, and demonstrating driving device 1, at the uniform velocity propelling piston 2 can
To keep pressure in cylinder 3 to stablize in goal pressure, to realize that constant pressure leaks.SF6Micro constant pressure Leaking Simulation device can also be with
The SF of different pressures insulation gas chamber is simulated by changing the fltting speed (at the uniform velocity promoting) of piston 26The pure micro constant pressure leakage of gas.
In a preferred embodiment, SF6There are three relief valves 6 on the outlet pipe of micro constant pressure Leaking Simulation device, often
A relief valve 6 controls the release of a leak, it can be achieved that one or more sulfur hexafluoride gas discharges, thus imitating substation
SF in on-site electrical equipment6The state of gas leakage.
By formula (9) it is found that the fltting speed of piston is faster, inner pressure of air cylinder is bigger, then the slip through same leak
Also bigger.Slip size is also related with the aperture of leak, and theoretically, aperture is bigger, and slip is bigger.
Referring to above-mentioned SF6The method of micro constant pressure Leaking Simulation carries out the slip of different leaks under different pressures
Test.At 20 °C, setting pressure is first adjusted to 0.4MPa, gradually opens three relief valves 6 and (only opens one every time
Relief valve 6), the pore size of relief valve 6 corresponding leak A, B, C are followed successively by 1.2mm, 2.5mm, 4.6mm, pass through slip
Caliberating device tests the slip of leak A, B, C respectively；Then change the driving velocity of driving device 1, with regulating piston 2
Fltting speed makes setting pressure successively rise to 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa, repeats previous step respectively to three
Leak carries out the constant pressure leakage under 0.5MPa, 0.6MPa, 0.7MPa, 0.8MPa pressure, tests the slip of each leak
Variation, test result are as shown in Figure 3.
Fig. 3 shows the leak for constant aperture, and slip increases with the increase of setting pressure.Uniform pressure
Under, the slip of different pore size leak is different, and positive correlation trend is presented.Pass through the connection of fltting speed and different pore size leak
Close application, available continuously adjustable slip.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with the scope of protection of the claims
It is quasi-.
Claims (9)
1. a kind of SF6Micro constant pressure Leaking Simulation device, it is characterised in that: include cylinder (3), mating be set to the cylinder
(3) piston (2) in and the driving device (1) to drive the piston (2) to move, the air inlet pipeline of the cylinder (3)
(31) it is equipped with pressure reducing valve (4) and aeration valve (5), the end of the outlet pipe (32) of the cylinder (3) is equipped with experimental box body
(8), the experimental box body (8) is equipped with leak and the relief valve (6) to control leak release gas, the cylinder
(3) or the pipeline of the cylinder (3) is equipped with the temperature of the gas in pipeline to measure cylinder (3) and the cylinder (3)
The temperature sensor (7) of degree.
2. SF according to claim 16Micro constant pressure Leaking Simulation device, it is characterised in that: on the experimental box body (8)
Leak be multiple, and the aperture of each leak is different.
3. SF according to claim 26Micro constant pressure Leaking Simulation device, it is characterised in that: on the experimental box body (8)
Leak be 3, pore size is respectively 1.2mm, 2.5mm, 4.6mm.
4. SF according to claim 16Micro constant pressure Leaking Simulation device, it is characterised in that: the cylinder (3) or institute
The pipeline for stating cylinder (3) is passed equipped with the pressure of the pressure of the gas in the pipeline to measure cylinder (3) and the cylinder (3)
Sensor (9).
5. SF according to claim 16Micro constant pressure Leaking Simulation device, it is characterised in that: the driving device (1) is
Linear stepping motor or hydraulic cylinder or pneumatic cylinder.
6. SF according to claim 46Micro constant pressure Leaking Simulation device, it is characterised in that: further include having a single-chip microcontroller control
System processed, the single-chip computer control system are connect with temperature sensor (7), pressure sensor (9) and driving device (1) respectively.
7. a kind of SF6Micro constant pressure Leaking Simulation method, uses the SF described in claim 1 to 66Micro constant pressure Leaking Simulation dress
It sets, which is characterized in that include following steps:
The S1 tonifying Qi stage: the air inlet pipeline (31) of cylinder (3) is connected into external air source, adjustment pressure reducing valve (4) to default outlet pressure
Power, closure relief valve (6) open aeration valve (5), and driving device (1) drives piston (2) toward movement outside until being full of in cylinder
SF6Gas, closure close aeration valve (5)；
The S2 pressure regulation stage: gas temperature is measured by temperature sensor (7), according to SF under certain temperature6The pressure and density of gas
Relationship, calculates the distance of piston needed for being adjusted to goal pressure (2) advance, and driving device (1) pushes piston (2) in cylinder
(3) inner to move, to adjust SF6Gas pressure is to target value；
S3 constant pressure leaks the stage: opening relief valve (6), SF6Gas is discharged by leak, driving device (1) at the uniform velocity propelling piston
(2) cylinder (3) interior pressure is kept to stablize in target pressure value, to realize that constant pressure leaks.
8. SF according to claim 76Micro constant pressure Leaking Simulation method, it is characterised in that: SF under certain temperature6Gas
Pressure and density relationship obtained by following formula:
P=56.2 × 10-6γT(1+B)-γ2A
In formula: A=74.9 × 10-6(1-0.727×10-3γ)；
B=2.51 × 10-3γ(1-0.846×10-3γ)；
P-gas pressure, unit MPa；
γ-gas density, unit kg/m3；
T-gas thermodynamic temperature, unit K.
9. SF according to claim 76Micro constant pressure Leaking Simulation method, it is characterised in that: driving device (1) is not by
Same speed at the uniform velocity propelling piston (2) is to realize that the constant pressure under different pressure leaks.
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| CN112213051A (en) * | 2020-09-03 | 2021-01-12 | 恒大恒驰新能源汽车研究院(上海)有限公司 | Air tightness detection method and device and electronic equipment |
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| CN101943691A (en) * | 2010-04-14 | 2011-01-12 | 广西电网公司电力科学研究院 | Device and method for checking SF6 gas leakage monitoring and alarming apparatuses |
| CN105004629A (en) * | 2015-04-21 | 2015-10-28 | 国家电网公司 | Calibration device of SF6 gas density on-line monitoring device |
| CN105758589A (en) * | 2016-05-13 | 2016-07-13 | 国家电网公司 | Platform for checking double-channel SF6 infrared imaging leak detector |
| CN210375530U (en) * | 2019-08-21 | 2020-04-21 | 广西电网有限责任公司电力科学研究院 | SF (sulfur hexafluoride)6Micro constant pressure leakage simulation device |
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| CN112213051A (en) * | 2020-09-03 | 2021-01-12 | 恒大恒驰新能源汽车研究院(上海)有限公司 | Air tightness detection method and device and electronic equipment |
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