CN207007438U - The dry check system of diaphragm gas meter complete machine sealing helium - Google Patents
The dry check system of diaphragm gas meter complete machine sealing helium Download PDFInfo
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- CN207007438U CN207007438U CN201720601555.0U CN201720601555U CN207007438U CN 207007438 U CN207007438 U CN 207007438U CN 201720601555 U CN201720601555 U CN 201720601555U CN 207007438 U CN207007438 U CN 207007438U
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Abstract
A kind of dry check system of diaphragm gas meter complete machine sealing helium is the utility model is related to, the system includes leak detection vacuum tank, vavuum pump, vacuum meter, valve and pipeline etc..Using system and method for the present utility model, almost without flase drop missing inspection, detection efficiency is high, and the leak detection of multiple diaphragm gas meters can be completed in the short time.
Description
Technical field
It the utility model is related to a kind of dry check system of diaphragm gas meter complete machine sealing helium.
Background technology
Gas meter, flow meter is mostly diaphragm gas meter at present, and typically two kinds of method is tried using dry type comparison method and water for gas meter, flow meter leak detection
Mode, dry type comparison method is that dry air is filled with gas meter, flow meter, after pressure balance, the pressure change of measurement table inner high voltage gas
To judge its sealing, because pressure is unable to reach balance in a short time, its detection efficiency is relatively low.Water examination method fills gas meter, flow meter
With the air of certain pressure and then it is immersed in water, whether has bubble by observing in water to judge whether gas meter, flow meter there are leakage feelings
Condition is present.However, there is the problem of flase drop missing inspection, may detect limited view, detection efficiency is low in water examination method.Also a kind of air pressure
Method leak hunting method：It is that the accurate compressed air of control pressure is input in test specimen by instrument, then automatically shuts down source of inflation gas,
Magnetic valve accurately controls the air balance of stipulated time, then turned off balanced action magnetic valve (balanced valve one be terminated with by
Test specimen, another to terminate the standard component not leaked), sensed by the accurate differential pressure being connected by test specimen with the same gas circuit of standard component
Device, standard component and the differential pressure value by test specimen are measured at the appointed time, then obtained by temperature-compensating by the reality of test specimen
Pressure drop caused by leakage, so as to judge whether test specimen leaks.Actual use occur due to environment temperature, pressure it is small
The phenomenon judged by accident, will usually occur in change.Due to the particularity of gas meter, flow meter, the outer leakage quantity of enterprise requirements gas meter, flow meter is zero, this
It is the reason for final exfactory inspection of current gas meter, flow meter industry does not use this kind equipment.
Chinese patent notification number CN203100988 discloses a kind of gas meter, flow meter semi-automatic water examination leak test plant, the equipment bag
Support rotary mechanism, carriage mechanism, control system and water tank are included, the support rotary mechanism includes guide upright post, master cylinder, circle
Dish axle, oscillating platform, oscillating cylinder, lifting loop bar and support arm；Carriage mechanism is arranged on support rotary mechanism side, and water tank is set
In the opposite side of support rotary mechanism；The carriage mechanism includes bracket, countercylinder, constant pressure source of the gas connector and air gauge；Institute
Master cylinder, countercylinder, oscillating cylinder and Standard Cylinder is stated by pipeline and magnetic valve with constant pressure source of the gas to be connected.
Chinese patent CN105675220A discloses a kind of gas meter leak tightness detection means.It mainly solves existing detection
The problem of flase drop missing inspection, may detect limited view, detection efficiency is low be present in device.It includes liquid pool, connecting plate, some pocket watches
Sealing mechanism and inflation mechanism, are respectively equipped with two support arms on liquid pool Chi Kou madial wall, and connecting plate is hinged on two support arms
On, the pocket watch cylinder of pocket watch sealing mechanism is arranged on connecting plate, and one end of pull bar is connected with the piston rod of pocket watch cylinder, separately
One end is provided with back-up ring, and positioning sleeve is sleeved on pull bar, and its one end is fixed on connecting plate, and the other end is provided with centring ring, sealing ring
It is sleeved on the pull bar between back-up ring and centring ring, the inflation pipe joint of inflation mechanism is with being opened on pocket watch cylinder piston rod
Filling channel, the inflation through hole being opened on pull bar are connected.
Utility model content
The purpose of this utility model is to provide a kind of dry check system of diaphragm gas meter complete machine sealing helium.
The dry check system of diaphragm gas meter complete machine sealing helium of the present utility model includes leak detection vacuum tank, vavuum pump, true
Sky meter, valve and pipeline,
Wherein, leak detection vacuum tank has an admission line, and one end and the membrane type in leak detection vacuum tank of admission line fire
The air inlet/outlet connection (bifurcated at one end of admission line, being connected respectively with the air inlet of diaphragm gas meter and gas outlet) of gas meter,
The other end of the admission line is connected to the helium air inlet pipe through the first to the 3rd Valve controlling, recovery evacuates pipeline, puts
Atmosphere duct, wherein helium air inlet pipe, recovery evacuate pipeline, amplification feed channel is switchably fired with the membrane type in leak detection vacuum tank
The air inlet of gas meter connects with gas outlet；
The admission line further branches out a diaphragm gas meter for being used to vacuumize diaphragm gas meter table internal cavity
Vacuum lead in table, vacuum lead is connected to the first vacuum extractor via the 4th valve in the diaphragm gas meter table,
The outlet of leak detection vacuum tank connects a leak detection vacuum tank outlet conduit, and the leak detection vacuum tank outlet conduit is further
It is divided into three branch roads, tie point connects the first vacuum extractor via the 5th valve, and the second branch road connects via the 6th valve
Second vacuum extractor, second vacuum extractor are further connected to helium mass spectrometer leak detector via the 7th valve, the helium mass spectrum
Further the 3rd vacuum extractor of connection, the 3rd branch road connect discharge duct to leak detector via the 8th valve；
Wherein, the first vacuum extractor is used in the leak detection vacuum tank of diaphragm gas meter table inner chamber and diaphragm gas off-balancesheet
Portion vacuumizes, and the second vacuum extractor is used to inside the leak detection vacuum tank to diaphragm gas off-balancesheet vacuumize,
Preferably, the other end of the admission line is also associated with the nitrogen inlet duct through the 9th Valve controlling, wherein helium
Air inlet pipe, recovery evacuate pipeline, amplification feed channel, nitrogen inlet duct switchably with the diaphragm gas meter in leak detection vacuum tank
Air inlet connects with gas outlet.
The dry check system of helium of the present utility model includes：Vacuum system in diaphragm gas off-balancesheet vacuum system and diaphragm gas meter
System, wherein, diaphragm gas off-balancesheet vacuum system includes space and leak detection vacuum tank in the leak detection vacuum tank of diaphragm gas off-balancesheet and gone out
Mouth pipeline；Vacuum system in diaphragm gas meter inner chamber, helium air inlet pipe, diaphragm gas meter table including vacuumizing in diaphragm gas meter
Pipeline.
3rd vacuum extractor is used to remove to the helium in mass spectrograph connecting line.
Preferably, in vacuumizing, the air inlet of diaphragm gas meter and gas outlet are set down.
The purpose for setting the second vacuum extractor is, will be hunted leak vacuum tank and diaphragm gas meter by the first vacuum extractor
When being evacuated to certain vacuum degree (such as 50KPa), another leak detection vacuum tank is taken out by valve transfer, utilizes the second vacuum means
Put and further vacuumized, after being extracted into certain vacuum degree (such as 30Pa), hunted leak using helium mass spectrometer leak detector.
Further, the first vacuum extractor and the second vacuum extractor each include lobe pump, the vavuum pump of series connection, inspection
SV200 vavuum pump of the forepump using such as LEYBOLD is leaked, leak detection vacuum tank volume adds pump-line to deduct workpiece tool
Module volume, it is about 15 liters actually to vacuumize volume (maximum), using LEYBOLD SV200 vavuum pump forvacuum, according to reason
By calculating about 12 seconds or so, vacuum tank can be extracted into 30Pa vacuum, in order to ensure the fast pump energy of vacuum system
Power, increase use WAU251 lobe pumps, lobe pump and vavuum pump are used in series.
Further, above-mentioned valve is magnetic valve.
Further, the first vacuum extractor can be connected in parallel multiple leak detection vacuum tanks and in leak detection vacuum tank
Multiple diaphragm gas meters, and the second vacuum extractor can be connected in parallel multiple leak detection vacuum tanks.
Further, vacuum lead separates a branch pipe and connects helium recovery via the tenth valve in diaphragm gas meter table
System.
Further, vacuum lead separates a branch pipe and connects air via the 11st valve in diaphragm gas meter table
(being used to amplify gas).
Further, the recovery that helium recovery system includes being sequentially connected vacuumizes surge tank, vavuum pump, low-pressure tank, pressure
Contracting machine, high-pressure cylinder, preferably two high-pressure cylinders are to play cushioning effect.
Further, connected on the pipeline (such as leak detection vacuum tank outlet conduit) of the dry check system of helium of the present utility model
There is the referance leak (LK) for calibrating helium mass spectrometer leak detector.
The utility model further provides a kind of dry inspection of diaphragm gas meter complete machine sealing helium using said system
Method, this method include：
(A) the 4th valve, the 5th valve are opened, diaphragm gas meter and leak detection vacuum tank are entered using the first vacuum extractor
Row is vacuumized simultaneously, and the 4th valve is closed when pressure reaches 45-55kpa, preferably 47-52kpa, more preferably from about 50kpa；Leak detection
Vacuum tank continues to vacuumize, when vacuum tank vacuum of hunting leak reaches 90-110Pa, preferably 95-105Pa, more preferably from about 100Pa,
The valve of the vacuum tank vacuum pumping valve family status five is closed, preferably this section of pumpdown time is set as 2-6s, more preferably 3 seconds, keeps vacuum
The vacuum change of the vacuum pressure of case and workpiece lumen, test piece inner chamber and vacuum tank, judge that workpiece leaks with the presence or absence of big,
For the unqualified workpiece of detecting leakage, stop leak detection, equipment provides big leakage police instruction；
(B) stayed open for the qualified workpiece of detecting leakage, the 4th valve, the 5th valve, to vacuum tank and workpiece lumen
Continue to vacuumize, until the vacuum of vacuum tank reaches≤30Pa, close the 4th valve, the 5th valve, complete vacuum and take out in advance；
(C) open the 6th valve leak detection vacuum tank is continued to vacuumize using the second vacuum extractor, while open the 7th
Valve by pipeline UNICOM between vacuum tank and mass spectrograph, and the first vacuum extractor by valve transfer to next group of diaphragm gas
Table and leak detection vacuum tank carry out vacuumizing for such as step (A) and step (B)；
(D) helium mass spectrum leak detection process (is used to carry out helium mass spectrum leak detection test, activity time such as 13-20 seconds, example to workpiece
Such as 14s)：When vacuum tank vacuum reaches vacuum≤30Pa, helium mass spectrometer leak detector access system carries out helium background test (this
The bottom testing time is such as about 3s to 5s), (typically set when system helium background values meets the requirement of helium mass spectrum leak detection test
Determine system helium background values≤1 × 10-6Pa.m3/ s is that background is qualified), leak detector carries out background leak rate clearing processing automatically,
Then helium detection examination is formally entered；
(E) valve opened in helium air inlet pipe rushes note to diaphragm gas meter progress helium, when diaphragm gas meter internal pressure
Power reaches the valve closed during setting value (such as absolute pressure 45-55Kpa, preferably 50Kpa) in helium air inlet pipe, and vacuum tank vacuumizes
Leak detection (test such as 9 to 11 seconds), helium mass spectrum leak detection test is carried out to workpiece, obtains the slip of workpiece, and detection finishes pass
Close the 7th valve.
(F) leak detection of the diaphragm gas meter in next leak detection vacuum tank is optionally carried out.
Optionally, before step (A), school is carried out to helium mass spectrometer leak detector by introducing helium from referance leak (LK)
It is accurate.
Method of the present utility model further comprises helium recovery process, and the process includes：
The imported valve (the tenth valve) of helium recovery system is opened, the helium in diaphragm gas meter is taken out very into recovery
Empty buffer tank, then low-pressure tank is pumped into by vacuum；
With the pressure change of low pressure, compressor intermittent work is to keep the pressure of low-pressure tank, while compressor will be low
Press the gas press-in high-pressure cylinder in tank.
Vacuum tank can be opened to being amplified gas disposal, detection pressure inside and outside diaphragm gas meter by opening the 11st valve.
During leak detection, when helium leak test rate, which occurs, in leak detection reaches >=1 × 10-6Pa.m3/s, equipment will be automatically stopped
Leak detection, leak detector are isolated with vacuum tank cut-out immediately, and the helium that workpiece lumen is filled with is transferred to helium recovery state immediately, to prevent mistake
More helium leaks into vacuum tank and causes system helium background too high, influences the leak detection beat of equipment.While equipment automatic alarm is simultaneously
Provide the unqualified instruction of workpiece.
When system helium background values is exceeded, equipment automatic time delay carries out system helium background gas ballasting method clear operation.
During system helium background values≤1 × 10-5Pa.m3/s, system removes time≤10s of residual helium.
The advantages of the utility model：
Using system and method for the present utility model, almost without flase drop missing inspection, detection efficiency is high, can be completed in the short time
The leak detection of multiple diaphragm gas meters：
1st, accuracy rate improves；Equipment detects the precision that can improve leak detection, zero erroneous judgement.
2nd, efficiency, which improves, saves manually：One mass spectrograph can drag four stations, one equipment to ensure to complete in 15s
One gas meter, flow meter leak detection, artificial detection list table detection time is 60s/ people at present；Single device can complete current manual inspection 4
Personal artificial amount greatly improves efficiency.
Brief description of the drawings
Fig. 1 is the schematic diagram of the dry check system of diaphragm gas meter complete machine sealing helium of the present utility model.
Fig. 2 is helium recovery system schematic diagram.
Description of reference numerals
B1、B2、B3、B4：Vavuum pump.
FC1-1A、FC1-1B、FC1-2A、FC1-2B、FC1-3A、FC1-3B、FC1-4、FC4-1A、FC4-1B、FC4-2B、
FC4-2A、FC4-3B、FC4-3A、FC4-4：Magnetic valve.
FQ1-1、FQ1-2、FQ1-3、FQ1-4、FZ1、FQ4-1、FQ4-2、FQ4-3、FQ4-4、FZ2、FQ2、FC1-1、
FC1-2、FC1-3、FC4-1、FC4-2、FC4-3、FQ3、FQ4、FQ5、FQ6、FQ7：Magnetic valve.
VG1、VG4：Vacuum meter；G1、G4：Pressure transmitter；F1A、F4A：Filter and sound damper；F1、F4：Filter；Q1：Nitrogen
Gas；Q2：Helium；Q3：Amplify gas；Q4：Recovery evacuates；Q5：Diaphragm gas meter evacuates (workpiece evacuation).
1：Pressure-reducing valve；2：Pressure switch；3、21：Magnetic valve；4- leak detection vacuum tanks；5：Manual ball valve；6：Lower pressure tanks；
7、23：Pressure drag is advised；8：He consistency transmitters；9：Low-pressure safety valve；10：Filter；11：Compressor；12：Check valve；13：High pressure
Filter；14：High-pressure safety valve；15：High-pressure cylinder；16：Vavuum pump；17：High-pressure pressure-reducing valve；20：Diaphragm gas meter；22：Return
Receipts vacuumize surge tank；24：Steel cylinder connector；25 water traps.
Embodiment
Illustrate the utility model below in conjunction with accompanying drawing.It should be understood that these explanations to be exemplary, are not formed pair
Any restrictions of the present utility model.
As shown in figure 1, the dry check system of diaphragm gas meter complete machine sealing helium includes leak detection vacuum tank, vavuum pump, vacuum
(VG1, VG4), valve and pipeline are counted,
Wherein, leak detection vacuum tank 4 has an admission line, and one end and the membrane type in leak detection vacuum tank of admission line fire
The air inlet connection of gas meter 20, the other end of the admission line are connected to through first, second, third and the 9th valve
The helium air inlet pipe, recovery evacuation tube of (FC1-1A, FC1-1B, FC1-2A, FC1-2B, FC1-3A, FC1-3B, FC1-4) control
Road, nitrogen inlet duct, amplification feed channel, wherein helium air inlet pipe, recovery evacuate pipeline, nitrogen inlet duct, amplification feed channel can
Switching ground is connected with the air inlet of the diaphragm gas meter 20 in leak detection vacuum tank；
The gas outlet of diaphragm gas meter 20 connects a diaphragm gas meter vacuum lead, the diaphragm gas meter vacuum-pumping tube
Road is connected to the first vacuum extractor via the 4th valve FC1-1,
The outlet of leak detection vacuum tank connects a leak detection vacuum tank outlet conduit, and the leak detection vacuum tank outlet conduit is further
Be divided into three branch roads, tie point via the 5th valve FQ1-1 the first vacuum extractors of connection (B1, B2), the second branch road via
6th valve FQ1-2 the second vacuum extractors of connection (B3, B4), second vacuum extractor is further via the 7th valve FQ2
Helium mass spectrometer leak detector MS is connected to, further the 3rd vacuum extractor of connection (is used to remove mass spectrograph company the helium mass spectrometer leak detector
The helium taken over inside road), the 3rd branch road connects discharge duct (emptying) via the 8th valve.In one embodiment, one
Helium inspection instrument drags four vacuum tank repeating query detections, B1, B2 rapid vacuumizing, vacuum tank is extracted into 50KPa, B1, B2 complete work, lead to
Valve transfer B1, B2 is crossed to go to take out another vacuum tank；B1, B2 have been evacuated, and B3, B4 intervention are further vacuumized, and are extracted into
After 30Pa, helium leak check instrument can intervene detection.
Further, the first vacuum extractor and the second vacuum extractor various lobe pump, vavuum pumps including connecting.Inspection
SV200 vavuum pump of the forepump using such as LEYBOLD is leaked, leak detection vacuum tank volume adds pump-line to deduct workpiece tool
Module volume, it is about 15 liters actually to vacuumize volume (maximum), using LEYBOLD SV200 vavuum pump forvacuum, according to reason
By calculating about 12 seconds or so, vacuum tank can be extracted into 30Pa vacuum, in order to ensure the fast pump energy of vacuum system
Power, increase use WAU251 lobe pumps, lobe pump and vavuum pump are used in series.
Further, above-mentioned valve is magnetic valve.
Further, the first vacuum extractor can be connected in parallel multiple leak detection vacuum tanks and in leak detection vacuum tank
Multiple diaphragm gas meters, and the second vacuum extractor can be connected in parallel multiple leak detection vacuum tanks.
Further, vacuum lead separates a branch pipe via the tenth valve FC1-2 connection helium in diaphragm gas meter table
Gas recovery system.
Further, vacuum lead separates a branch pipe and connected via the 11st valve FC1-3 in diaphragm gas meter table
Air (is used to amplify gas).
Further, connected on the pipeline (such as leak detection vacuum tank outlet conduit) of the dry check system of helium of the present utility model
There is the referance leak (LK) for calibrating helium mass spectrometer leak detector, existed by introducing helium from referance leak (LK) via valve FQ5
Helium mass spectrometer leak detector is calibrated before helium leak check.
Further, as shown in Fig. 2 the recovery that helium recovery system includes being sequentially connected vacuumizes surge tank 22, vacuum
Pump 16, low-pressure tank 6, compressor 11, high-pressure cylinder 15, preferably two high-pressure cylinders 15 are to play cushioning effect.
Vacuum meter such as VG1, VG4, which may be mounted at, is used for measurement of vacuum in vacuum-pumping pipeline, can also install pressure in addition
Transmitter such as G1, G4 are used to adjust.Filter F 1, F4 can be installed on the admission line of leak detection vacuum tank 4.
Included using the dry detecting method of diaphragm gas meter complete machine sealing helium of said system：
(A) the 4th valve FC1-1, the 5th valve FQ1-1 are opened；Utilize the first vacuum extractor (B1 lobe pumps, B2 vacuum
Pump) diaphragm gas meter and leak detection vacuum tank vacuumize simultaneously, when pressure reaches 45-55kpa, preferably 47-52kpa, more
The 4th valve FC1-1 is closed during preferably from about 50kpa；Leak detection vacuum tank continues to vacuumize, when leak detection vacuum tank vacuum reaches 90-
During 110Pa, preferably 95-105Pa, more preferably from about 100Pa, it is the 5th valve FQ1-1 to close leak detection vacuum tank vacuum-pumping valve, excellent
Select this section of pumpdown time to be set as 2-6s, more preferably 3 seconds, keep vacuum tank and the vacuum pressure of workpiece lumen, test piece
The vacuum of inner chamber and vacuum tank changes, and judges that workpiece leaks with the presence or absence of big, for the unqualified workpiece of detecting leakage, stops leak detection,
Equipment provides big leakage police instruction；
Judge whether the method leaked greatly：
When workpiece lumen vacuum pressure value is kept relative stability without large change, while the vacuum of vacuum tank is not larger
During change, it is possible to determine that workpiece is without big leakage.Big leakage be present on the contrary then workpiece.
Detecting leakage is completed, while vacuum tank and workpiece lumen are put into air, and vacuum tank and workpiece lumen pressure are put down with air
After weighing apparatus, vacuum chamber door is opened, the material transfer device that workpiece is made up of the gentle pawl of electronic slide unit captures output vacuum tank automatically.
(B) for the qualified workpiece of detecting leakage, the 4th valve FC1-1, the 5th valve FQ1-1 are stayed open, to vacuum tank
And workpiece lumen continues to vacuumize, until the vacuum of vacuum tank reaches≤30Pa, the 4th valve FC1-1, the 5th valve are closed
FQ1-1, complete vacuum and take out in advance；
(C) the 6th valve FQ1-2 is opened using the second vacuum extractor (B3 lobe pumps, B4 vavuum pumps) to vacuum tank of hunting leak
4 continue to vacuumize, while open the 7th valve FQ2 and will hunt leak pipeline UNICOM between vacuum tank 4 and mass spectrograph MS, and first takes out very
Empty device (B1, B2) can carry out such as step (A), (B) by valve transfer to next group of diaphragm gas meter and leak detection vacuum tank
Vacuumize；
(D) helium mass spectrum leak detection process (is used to carry out helium mass spectrum leak detection test, activity time such as 13-20 seconds, example to workpiece
Such as 14s)：When the leak detection vacuum of vacuum tank 4 reaches vacuum≤30Pa, helium mass spectrometer leak detector MS access systems carry out helium background
Test (the background testing time is such as about 3s to 5s), when system helium background values meets the requirement of helium mass spectrum leak detection test
(general initialization system helium background values≤1 × 10-6Pa.m3/s is that background is qualified), it is clear that leak detector carries out background leak rate automatically
Zero processing, then formally enter helium detection examination；
(E) the valve FC1-3A, FC1-3B opened in helium air inlet pipe rushes note to diaphragm gas meter progress helium, works as film
Pressure reaches the valve closed during setting value (such as absolute pressure 45-55Kpa, preferably 50Kpa) in helium air inlet pipe in formula gas meter, flow meter 20
Door, vacuum tank vacuumize leak detection (test such as 9 to 11 seconds), carry out helium mass spectrum leak detection test to workpiece, obtain letting out for workpiece
Leak rate, detection, which finishes, closes the 7th valve.
(F) leak detection of the diaphragm gas meter in next leak detection vacuum tank is optionally carried out.
Optionally, before step (A), school is carried out to helium mass spectrometer leak detector by introducing helium from referance leak (LK)
It is accurate.
Open FC1-2 and carry out helium recovery in workpiece, recovery, which finishes, closes FC1-2；FC1-3 is opened, FC1-4 is in workpiece
Outer to be amplified gas disposal, detection pressure can open vacuum tank.
During leak detection, when helium leak test rate, which occurs, in leak detection reaches >=1 × 10-6Pa.m3/s, equipment will be automatically stopped
Leak detection, leak detector are isolated with vacuum tank cut-out immediately, and the helium that workpiece lumen is filled with is transferred to helium recovery state immediately, to prevent mistake
More helium leaks into vacuum tank and causes system helium background too high, influences the leak detection beat of equipment.While equipment automatic alarm is simultaneously
Provide the unqualified instruction of workpiece.
Embodiment 1
As shown in figure 1, (A) makes the air inlet of diaphragm gas meter and gas outlet set down, the 4th valve FC1- is opened
1st, the 5th valve FQ1-1；Using the first vacuum extractor (B1 lobe pumps, B2 vavuum pumps) to diaphragm gas meter and leak detection vacuum tank
Progress is vacuumized simultaneously, and the 4th valve is closed when pressure reaches about 50kpa；Leak detection vacuum tank continues to vacuumize, when leak detection is true
When empty van vacuum reaches about 100Pa, it is the 5th valve FQ1-1 to close leak detection vacuum tank vacuum-pumping valve, and preferably this section is taken out very
It is set as 3 seconds between space-time, keeps the vacuum pressure of vacuum tank and workpiece lumen, tests the true of diaphragm gas meter inner chamber and vacuum tank
Reciprocal of duty cycle changes, and judges that diaphragm gas meter with the presence or absence of big leakage, for the unqualified diaphragm gas meter of detecting leakage, stops leak detection, equipment
Provide big leakage police instruction；
Judge whether the method leaked greatly：
When diaphragm gas meter inner chamber vacuum pressure value is kept relative stability without large change, while the vacuum of vacuum tank does not have
When having large change, it is possible to determine that diaphragm gas meter is without big leakage.Big leakage be present on the contrary then diaphragm gas meter.
Detecting leakage is completed, while vacuum tank and workpiece lumen are put into air, vacuum tank and diaphragm gas meter chamber pressure with
After atmospheric equilibrium, vacuum chamber door is opened, the material transfer device that diaphragm gas meter is made up of the gentle pawl of electronic slide unit captures automatically
Export vacuum tank.
(B) for the qualified diaphragm gas meter of detecting leakage, the 4th valve FC1-1, the 5th valve FQ1-1 are stayed open, right
Vacuum tank and diaphragm gas meter inner chamber continue to vacuumize, until the vacuum of vacuum tank reaches≤30Pa, close the 4th valve, the
Five valves, complete vacuum and take out in advance；
(C) the 6th valve FQ1-2 is opened using the second vacuum extractor (B3 lobe pumps, B4 vavuum pumps) to vacuum tank of hunting leak
4 continue to vacuumize, while open the 7th valve FQ2 and will hunt leak pipeline UNICOM between vacuum tank 4 and mass spectrograph MS, and first takes out
Vacuum plant (B1, B2) is carried out such as step (A), (B) by valve transfer to next group of diaphragm gas meter and leak detection vacuum tank
Vacuumize；
(D) helium mass spectrum leak detection process (being used to carry out helium mass spectrum leak detection test, activity time 14s to workpiece)：When leak detection is true
The vacuum of empty van 4 reaches vacuum≤30Pa, and helium mass spectrometer leak detector MS access systems carry out the test of helium background (when background is tested
Between be about 3s to 5s), when system helium background values meet helium mass spectrum leak detection test requirement when (general initialization system helium background
It is that background is qualified to be worth≤1 × 10-6Pa.m3/s), leak detector carries out background leak rate clearing processing automatically, then formally enters helium
Detection examination；
(E) the valve FC1-3A, FC1-3B opened in helium air inlet pipe rushes note to diaphragm gas meter progress helium, works as film
Pressure reaches the valve closed during setting value (such as absolute pressure 50Kpa) in helium air inlet pipe in formula gas meter, flow meter 20, and vacuum tank is taken out very
Sky leak detection (test 9 to 11 seconds), helium mass spectrum leak detection test is carried out to workpiece, obtains the slip of workpiece, and detection finishes closing
7th valve.
(F) leak detection of the diaphragm gas meter in next leak detection vacuum tank is carried out.
As a result show, above method longtime running, errorless leak detection inspection, detection efficiency is high, and completing all leak detection processes only needs
About 56 seconds.Economic benefit is obvious.
Comparative example 1
Method, inlet charge pressure are examined using the complete machine sealing water of prior art：50KPa-60KPa gas outlets go out air pressure
Power：45KPa-55KPa detection times：2 minutes.Although its equipment is simple, visual result, precision and efficiency of detecting is low, people
Had a great influence for factor, gas meter, flow meter industry complete machine sealing qualification rate is up to more than 99.5% at present, is grasped during long-term observation
Workmanship is easy to visual fatigue occur, or operative employee in detection process notice shift when, there is gas in gas meter, flow meter leakage point
It is not observed during bubble and causes missing inspection.It can not realize that automatic ration leaks hunting, while can also bring humidity to get rusty and numerous to gas meter, flow meter
Trivial surface of test piece attached water post processing.Up to 10 can only be detected-2To 10-3Mbar l/s leakage.Further, since the table of water
Face tension force, minute bubbles can not be formed at all, so, bubble detection is carried out in water can not detect smaller small opening at all.Secondly,
Cost of labor is high under low production efficiency, production efficiency：480/people .8 hours, cost of labor：5000 yuan/month people, money of wasting water
Source is bigger, single about 0.53 yuan of cost of table leak detection.
And helium of the present utility model does inspection method, if two/hour of 8 station of equipment 450, the people of people's number 1：Equipment is tieed up
Shield and failture evacuation, single about 0.09 yuan of cost of table leak detection.
Diaphragm gas meter detection record (experimental record)
Upper table is actual test data, and wherein that block gas meter, flow meter of serial number 14 is water leak detection inspection product, is so flowed into
Market also brings along hidden danger, and is qualified using sequence number 1-13,15-20 of the utility model leak detection system and method.
Claims (7)
1. the dry check system of a kind of diaphragm gas meter complete machine sealing helium, it is characterised in that it includes hunt leak vacuum tank, vacuum
Pump, vacuum meter, valve and pipeline,
Wherein, leak detection vacuum tank has an admission line, one end and the diaphragm gas meter in leak detection vacuum tank of admission line
Air inlet connected with gas outlet, the other end of the admission line is connected to the helium through the first to the 3rd Valve controlling and entered
Tracheae, recovery evacuate pipeline, amplification feed channel, wherein helium air inlet pipe, recovery evacuate pipeline, amplification feed channel switchably with
The air inlet of diaphragm gas meter in leak detection vacuum tank connects with gas outlet；
The admission line further branches out one and is used in the diaphragm gas meter table that is vacuumized to diaphragm gas meter table internal cavity
Vacuum lead, vacuum lead is connected to the first vacuum extractor via the 4th valve in the diaphragm gas meter table,
The outlet of leak detection vacuum tank connects a leak detection vacuum tank outlet conduit, and the leak detection vacuum tank outlet conduit is further divided into
Three branch roads, tie point connect the first vacuum extractor via the 5th valve, and the second branch road connects second via the 6th valve
Vacuum extractor, second vacuum extractor are further connected to helium mass spectrometer leak detector via the 7th valve, the helium mass spectrum leak detection
Further the 3rd vacuum extractor of connection, the 3rd branch road connect discharge duct to instrument via the 8th valve；
Wherein, the first vacuum extractor is used for being taken out inside the leak detection vacuum tank of diaphragm gas meter table inner chamber and diaphragm gas off-balancesheet
Vacuum, the leak detection vacuum tank inner space that the second vacuum extractor is used for diaphragm gas off-balancesheet are further vacuumized.
2. the dry check system of helium according to claim 1, it is characterised in that the other end of the admission line be also associated with through
The nitrogen inlet duct of 9th Valve controlling, wherein helium air inlet pipe, recovery evacuate pipeline, amplification feed channel, nitrogen inlet duct can
Switching ground connects with the air inlet of the diaphragm gas meter in leak detection vacuum tank and gas outlet.
3. the dry check system of helium according to claim 1, it is characterised in that the first vacuum extractor and the second vacuum means
Putting each includes lobe pump, the vavuum pump of series connection.
4. the dry check system of helium according to any one of claim 1-3, it is characterised in that the first vacuum extractor can
It is connected in parallel multiple leak detection vacuum tanks and multiple diaphragm gas meters in leak detection vacuum tank, and the second vacuum extractor energy
Enough it is connected in parallel multiple leak detection vacuum tanks.
5. the dry check system of helium according to any one of claim 1-3, it is characterised in that taken out in diaphragm gas meter table true
Vacant duct separates a branch pipe and connects helium recovery system via the tenth valve.
6. the dry check system of helium according to any one of claim 1-3, it is characterised in that taken out in diaphragm gas meter table true
Vacant duct separates a branch pipe and connects air via the 11st valve.
7. the dry check system of helium according to claim 5, it is characterised in that what helium recovery system included being sequentially connected returns
Receipts vacuumize surge tank, vavuum pump, low-pressure tank, compressor, high-pressure cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720601555.0U CN207007438U (en) | 2017-05-26 | 2017-05-26 | The dry check system of diaphragm gas meter complete machine sealing helium |
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| CN201720601555.0U CN207007438U (en) | 2017-05-26 | 2017-05-26 | The dry check system of diaphragm gas meter complete machine sealing helium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024324A (en) * | 2017-05-26 | 2017-08-08 | 廊坊润能燃气设备有限公司 | The diaphragm gas meter dry check system of complete machine sealing helium and method |
| CN109253392A (en) * | 2018-08-24 | 2019-01-22 | 苏州澳佰特自动化设备有限公司 | A kind of control method of helium leak check filling recyclable device |
| CN113358290A (en) * | 2021-06-16 | 2021-09-07 | 马鞍山市奈特仪表科技有限公司 | Stainless steel sealing detection method based on helium mass spectrometer leak detector |
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2017
- 2017-05-26 CN CN201720601555.0U patent/CN207007438U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107024324A (en) * | 2017-05-26 | 2017-08-08 | 廊坊润能燃气设备有限公司 | The diaphragm gas meter dry check system of complete machine sealing helium and method |
| CN107024324B (en) * | 2017-05-26 | 2024-02-13 | 廊坊润能燃气设备有限公司 | Helium dry detection system and method for complete machine tightness of diaphragm gas meter |
| CN109253392A (en) * | 2018-08-24 | 2019-01-22 | 苏州澳佰特自动化设备有限公司 | A kind of control method of helium leak check filling recyclable device |
| CN113358290A (en) * | 2021-06-16 | 2021-09-07 | 马鞍山市奈特仪表科技有限公司 | Stainless steel sealing detection method based on helium mass spectrometer leak detector |
| CN113358290B (en) * | 2021-06-16 | 2022-05-31 | 马鞍山市奈特仪表科技有限公司 | Stainless steel sealing detection method based on helium mass spectrometer leak detector |
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