CN108627308A - From high-pressure air source to the inflation method of workpiece, air charging system and differential pressure air-leakage detector - Google Patents
From high-pressure air source to the inflation method of workpiece, air charging system and differential pressure air-leakage detector Download PDFInfo
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- CN108627308A CN108627308A CN201810695080.5A CN201810695080A CN108627308A CN 108627308 A CN108627308 A CN 108627308A CN 201810695080 A CN201810695080 A CN 201810695080A CN 108627308 A CN108627308 A CN 108627308A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000000740 bleeding effect Effects 0.000 claims description 11
- 230000005611 electricity Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000001514 detection method Methods 0.000 description 16
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005273 aeration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to high-pressure air source inflation method and the differential pressure air-leakage detector based on inflation method, the inflation method include：(1) sequentially connected first valve, gas tank and the second valve are set between high-pressure air source and workpiece；(2) first valves are connected, and the second valve disconnects, and high-pressure air source is inflated to gas tank；(3) first valves disconnect, and the second valve conducting, gas tank is inflated to workpiece；(4) alternating the first valve of break-make and the second valve so that high-pressure air source reaches preset pressure via gas tank to workpiece inflation.The present invention can accurately be filled with gas into workpiece, realize the inflation under small air pressure, widen the application field of gas-tight tester, significantly reduce equipment production cost.
Description
Technical field
The present invention relates to air tightness detection equipment technical field more particularly to a kind of high-pressure air source inflation method and based on filling
The differential pressure air-leakage detector of gas method.
Background technology
With the development of social progress and industrialization production, high-quality is being pursued by the production firms of all trades and professions, more
While functional product, also the efficient and clean of production process is being required.Therefore, more and more modern science and technology are applied
Into production practices.And sealing performance is in auto industry, gas utensil industry, semiconductor machining industry, aerospace industry, food work
All it is the important parameter of properties of product quality in industry, health care industry and other all industries.Currently, most common air-tightness inspection
Survey method includes bubble method, trace gas detection method, voltage drop detection method, supercritical ultrasonics technology and differential pressure air-leakage test method etc..
Bubble method detection air-tightness precision is low, speed is slow, and the gas for being filled with sufficiently high pressure is not allowed in measured piece, and lets out
In the case that leakage quantity is again small, the speed that bubble generates will be very slow, need people to carry out continuing observation in addition, efficiency will compare
Lowly, or even there is the problem of failing to judge and judging by accident, and need cleaning clean after being measured, to prevent the corrosion oxidation of measured piece
Deng.The cost is relatively high for trace gas detection method, and the search gas for being affected, and being used by surrounding air background has can
Environment can be polluted, injury is generated to human body.For voltage drop detection method in the case where leakage rate is smaller, the pressure drop in the short time is very
Small, detection efficiency is low.Ultrasonic Detection Method has more requirement to the volume of measured piece, surface, and precision is nor very high.
Differential pressure leak detection method is by gas while to be filled with measured piece in standard, then compares two within a certain period of time
Differential pressure between person, and then judge whether measured piece has leakage.The more other detection methods of differential pressure leak detection method have detection
Precision is high, detection speed is fast, safety and environmental protection, requires the advantages such as low, applied widely to resource environment.Current differential pressure measuring instrument
It is the air inflow that measured piece and standard component are controlled by high-precision pressure regulator valve, it is therefore desirable to configure a high-precision essence
Pressure regulator valve controls air inflow, and when directly controlling air inflow using high-precision pressure regulator valve, aeration speed is slow, and high-precision
The pressure regulator valve price of degree is relatively high, and the manufacturing cost of entire differential pressure air-leakage detector is also very high.
Meanwhile existing gas is filled with workpiece (measured piece) is to change air pressure by controlling the opening and closing degree of pressure regulator valve
Size, if requiring to carry out under small air pressure, when 5Kpa (such as air pressure be less than) is accurate to be adjusted, the production to pressure regulator valve
Required precision is higher, and production cost is higher.
Invention content
It is right under the conditions of small measuring air pressure it is an object of the invention to be directed to differential pressure air-leakage detector in the prior art
Pressure regulator valve required precision is high, the problem for causing instrument production cost high, proposes a kind of novel exported from high-pressure air source to workpiece
Inflation method, air charging system and the differential pressure air-leakage detector of low-pressure gas.
For the attainment of one's purpose, technical solution provided by the invention is：
A kind of inflation method from high-pressure air source to workpiece comprising following steps：
(1) sequentially connected first valve, gas tank and the second valve are set between high-pressure air source and workpiece；
(2) first valves are connected, and the second valve disconnects, and high-pressure air source is inflated to gas tank；
(3) first valves disconnect, and the second valve conducting, gas tank is inflated to workpiece；
(4) repeat step (2) and (3), replace the first valve of break-make and the second valve so that high-pressure air source via gas tank to
Workpiece inflation reaches preset pressure.
Preferably, in the step (2), it is equipped with accurate adjustment pressure valve between the first valve and high-pressure air source, passes through accurate adjustment pressure
The air pressure of gas tank after valve control inflation.
Preferably, in the step 4, it is equipped with pressure sensor on the gas piping between the second valve and workpiece, leads to
Over-pressed force snesor judges inside workpiece atmospheric pressure value.
A kind of air charging system from high-pressure air source to workpiece comprising the buffering dress being arranged between high-pressure air source and workpiece
It sets, the buffer unit includes sequentially connected first valve, gas tank and the second valve, and high-pressure air source connects with the first valve
It connects, workpiece is connect with the second valve.
Preferably, accurate adjustment pressure valve is equipped between first valve and high-pressure air source, after the control inflation of accurate adjustment pressure valve
The air pressure of gas tank.
Preferably, the gas piping between second valve and workpiece is equipped with pressure sensor, passes through pressure sensing
Device judges inside workpiece atmospheric pressure value.
A kind of differential pressure air-leakage detector based on above-mentioned inflation method comprising sequentially connected high-pressure air source, coarse adjustment
Pressure valve, accurate adjustment pressure valve, buffer unit, and the first control valve and the second control valve that are connect respectively with buffer unit gas outlet,
It connects and is furnished with pressure sensor, the gas outlet of the first control valve and the second control valve on the gas pipeline at buffer unit gas outlet
Gas outlet between be equipped with difference gauge, the buffer unit includes sequentially connected first solenoid valve, gas tank and the second electromagnetism
The air inlet of valve, the first solenoid valve is connect with the gas outlet of accurate adjustment pressure valve, and the air inlet of the first control valve and the second control valve is equal
It is connect with the gas outlet of second solenoid valve.
Preferably, it is additionally provided with bypass solenoid valve between the accurate adjustment pressure valve and the pressure sensor, bypasses electromagnetism
Valve connect the gas circuit to be formed parallel connection with the first solenoid valve, gas tank and second solenoid valve, bypasses the air inlet and accurate adjustment pressure of solenoid valve
The gas outlet of valve connects, and gas outlet is connect with the first control valve and the second control valve respectively.
Preferably, first control valve and second control valve are all made of pneumatic operated valve, the first control valve and
The control terminal of two control valves is connected with third solenoid valve, and the air inlet of third solenoid valve is connect with the gas outlet of coarse adjustment pressure valve.
Preferably, the air inlet of first control valve and the second control valve is respectively connected with air bleeding valve.
Using technical solution provided by the invention, compared with prior art, have the advantages that：
The method that the present invention exports low-pressure gas from high-pressure air source to workpiece is passed through using the gentle qi of chong channel ascending adversely tank of two valves
The alternating break-make of valve realizes inflation and accurate pressure control to workpiece.The production cost of valve is relatively low, therefore significantly
Reduce production cost.
The present invention is compared in the prior art directly by high-precision pressure regulator valve control pressure value, and difference lies in accurate adjustment
Pressure valve gas outlet position is provided with buffer unit, and the gas tank in buffer unit is for storing gas, and the first solenoid valve is for controlling
High-pressure air source is inflated to gas tank, and second solenoid valve is inflated for controlling gas tank to measured piece and standard component, and the first solenoid valve is passed through
With the cooperation break-make repeatedly of second solenoid valve, is gradually inflated to measured piece and standard component, make measured piece and standard component air pressure inside
Reach the value of requirement.The air charging system of the present invention can be realized by controlling the make-and-break time of the first valve and the second valve
The application field of gas-tight tester has been widened in inflation under small air pressure.And air-leakage detector of the present invention is to pressure regulation
The required precision of valve is relatively low, and then plays the purpose for reducing detector production cost, and aeration speed is faster.
Description of the drawings
Fig. 1 is the schematic diagram of the high-pressure air source inflation method described in embodiment one；
Fig. 2 is the schematic diagram for the differential pressure air-leakage detector that embodiment two is related to；
Fig. 3 is the schematic diagram for the differential pressure air-leakage detector that embodiment three is related to.
It illustrates：1- coarse adjustment pressure valves, 2- accurate adjustment pressure valves, the first solenoid valves of 3-, 4- gas tanks, 5- second solenoid valves, by 6-
Way solenoid valve, 7- pressure sensors, the first control valves of 8-, the second control valves of 9-, 10- difference gauges, 12- air bleeding valves, 13- are tested
Part, 14- standard components, 15- high-pressure air sources.
Specific implementation mode
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the embodiments, and following embodiment is used for
Illustrate the present invention, but is not limited to the scope of the present invention.
Embodiment one：
In conjunction with shown in attached drawing 1, a kind of inflation method from high-pressure air source to workpiece comprising following steps：
(1) sequentially connected first valve 3, gas tank 4 and the second valve 5 are set between high-pressure air source 15 and workpiece 13；
(2) first valves 3 are connected, and the second valve 5 disconnects, and high-pressure air source 15 is inflated to gas tank 4；
(3) first valves 3 disconnect, and the second valve 5 conducting, gas tank 4 is inflated to workpiece 13；
(4) step (2) and (3) is repeated, alternately break-make the first valve 3 and the second valve 5 so that high-pressure air source 15 is via gas
Tank 4 reaches preset pressure to the inflation of workpiece 13.
In the step (2), it is equipped with accurate adjustment pressure valve 2 between the first valve 3 and high-pressure air source 15, passes through accurate adjustment pressure valve 2
The air pressure of gas tank 4 after control inflation.In the step 4, pressure is equipped on the gas piping between the second valve 5 and workpiece 13
Sensor 7 judges 13 air pressure inside value of workpiece by pressure sensor 7.
This inflation method uses a kind of air charging system from high-pressure air source to workpiece, as shown in Figure 1, it is included in high pressure
The buffer unit being arranged between air source 15 and workpiece 13, the buffer unit include sequentially connected first valve 3, gas tank 4
With the second valve 5, high-pressure air source 15 is connect with the first valve 3, and workpiece 13 connect 5 with the second valve.First valve 3 and height
It is equipped with accurate adjustment pressure valve 2 between pressurized air source 15, passes through the air pressure of gas tank after the control inflation of accurate adjustment pressure valve 2.Second valve 5 and work
It is equipped with pressure sensor 7 between part 13, inside workpiece atmospheric pressure value is judged by pressure sensor 7.
Embodiment two：
In conjunction with shown in attached drawing 2, a kind of differential pressure air-leakage detector of the present invention, including high-pressure air source 15, coarse adjustment pressure
Valve 1, accurate adjustment pressure valve 2, buffer unit, pressure sensor 7, the first control valve 8, the second control valve 9 and difference gauge 10.Described is slow
Flushing device includes again gas tank 4, and the first solenoid valve 3 and second solenoid valve 5 in gas tank air inlet and vent position is arranged.
The air inlet of coarse adjustment pressure valve 1 is connect by gas pipeline with high-pressure air source, and the air inlet of accurate adjustment pressure valve 2 passes through gas
Pipeline is connect with the gas outlet of coarse adjustment pressure valve 1, the outlet that the air inlet of the first solenoid valve 3 passes through gas pipeline and accurate adjustment pressure valve 2
Mouth connection, the air inlet of gas tank 4 are connect with the first solenoid valve 3, and the air inlet of second solenoid valve 5 passes through gas pipeline and gas tank 4
Gas outlet connection, the inlet end of the first control valve 8 and the second control valve 9 going out by gas pipeline and second solenoid valve 5
Gas port connects, and the gas pipeline is equipped with pressure sensor 7, for measuring the gas for being filled with measured piece and standard component internal gas
Pressure value, measured piece 13 are connect with the gas outlet of the first control valve 8, and standard component 14 is connect with the gas outlet of the second control valve 9, connection
It is connected with difference gauge 10 between the gas pipeline of 13 air inlet of measured piece and the gas pipeline of connection 14 air inlet of standard component, is used
In the draught head of detection measured piece 13 and 14 inner space of standard component.Connect 8 air inlet of the first control valve and the second control valve 9 into
Air bleeding valve 12 is also connected with by another way gas pipeline on the gas pipeline of gas port, goes out standard component for detecting heel row and is tested
Gas inside part.
The first control valve 8 and the second control valve 9 use pneumatic operated valve, the first control valve 8 and the second control valve 9 in the present embodiment
A third solenoid valve 11 is needed to configure to realize the break-make of control the first control valve 8 and the second control valve 9, third solenoid valve 11
Air inlet connect with the gas outlet of coarse adjustment pressure valve 1, the gas outlet of third solenoid valve 11 passes through gas piping and the first control valve 8
It is connected with the control terminal of the second control valve 9.
Included the following steps using the method that above-mentioned differential pressure air-leakage detector carries out air-leakage test to measured piece：
(1) the atmospheric pressure value K of gas is filled with according to the setting of measured piece test request, the present embodiment is right by taking K=3.2KPa as an example
Detection method is described, and sets the atmospheric pressure value of coarse adjustment pressure valve 1 as 0.4MPa~0.6MPa, the atmospheric pressure value of accurate adjustment pressure valve 2 is
20KPa；
(2) the first solenoid valve 3 is opened, second solenoid valve 5, third solenoid valve 11 and air bleeding valve 12 are closed, due to third electricity
Magnet valve is closed, and the first control valve 8 and the second control valve 9 are also in closed state, and high-pressure air source fills gas tank 4
Gas, at this point, the effect of coarse adjustment pressure valve 1 is to filter the impurity such as the moisture content in gas, the effect of accurate adjustment pressure valve 2 is to control gas tank
Air pressure in 4, until the air pressure in gas tank 4 reaches K, i.e. 3.2KPa；
(3) the first solenoid valve 3 is closed, second solenoid valve 5 and third solenoid valve 11 are opened, closes air bleeding valve 12, due to the
Three solenoid valves 11 are in open state, and by coarse adjustment pressure valve 1, treated that gas enters the first control valve 8 and the second control valve
9 control terminal opens the first control valve 8 and the second control valve, and then gas tank 4 is filled with part gas to measured piece 13 and standard component 14
Body at this point, pressure sensor 7 measures air pressure in measured piece and standard component, and judges whether air pressure reaches K values, i.e. 3.2KPa；
(4) if measured piece 13 and 14 air pressure inside of standard component do not reach K values, iterative cycles step 3 and step 4, until
Atmospheric pressure value in measured piece 13 and standard component 14 reaches K values；
(5) the first solenoid valve 3, second solenoid valve 5, third solenoid valve 11 and air bleeding valve 12 are closed, after standing a period of time
The value of difference gauge 10 is read, if draught head is more than or equal to the leakage upper pressure limit of setting, shows that measured piece 13 is asked in the presence of leakage
Topic shows that leakage problem is not present in measured piece if draught head is less than the leakage upper pressure limit of setting；
(6) after the completion of testing, air bleeding valve 12 is opened, the gas inside measured piece 13 and standard component 14 is discharged.
Embodiment three：
Due to that may be used for detecting the larger workpiece of volume, these bodies using differential pressure air-leakage detector of the present invention
The larger measured piece 13 of product is passed through a large amount of gas, to ensure the accuracy of detection, and only passes through buffer unit pair
The speed that measured piece 13 and standard component 14 are inflated is slower, therefore on the basis of embodiment two, in the accurate adjustment pressure valve and described
Pressure sensor between add bypass solenoid valve 6, as shown in Fig. 3, bypass solenoid valve 6 and the first solenoid valve 3, gas tank 4 and
The gas circuit that the connection of second solenoid valve 5 is formed is in parallel, and the air inlet of bypass solenoid valve 6 is connect with the gas outlet of accurate adjustment pressure valve 2, is bypassed
The gas outlet of solenoid valve 6 is connect with the first control valve 8 and the second control valve 9 respectively.
Use the method that the above-mentioned differential pressure air-leakage detector measured piece larger to volume carries out air-leakage test include with
Lower step：
(1) the atmospheric pressure value K of gas is filled with according to the setting of measured piece test request, setting coarse adjustment pressure valve 1 and accurate adjustment pressure valve 2
Atmospheric pressure value, wherein the atmospheric pressure value of coarse adjustment pressure valve setting is much larger than K, and the atmospheric pressure value that accurate adjustment pressure valve 2 is set is more than K；
(2) the first solenoid valve 3, bypass solenoid valve 6, third solenoid valve 11 are opened, second solenoid valve 5 and air bleeding valve are closed
12.Since third solenoid valve is in open state, by coarse adjustment pressure valve 1, treated that gas enters the first control valve 8 and
The control terminal of two control valves 9, the first control valve 8 and the second control valve 9 are also in open state.At this point, high-pressure air source is to gas
Tank 4 is inflated, and high-pressure air source is filled with gas to measured piece 13 and standard component 14 simultaneously.The effect of coarse adjustment pressure valve 1 is to filter gas
In the impurity such as moisture content, the effect of accurate adjustment pressure valve 2 is to control the air pressure in gas tank 4, until the air pressure in gas tank 4 reaches K values；
(3) the first solenoid valve 3 and bypass solenoid valve 6 are closed, second solenoid valve 5 and third solenoid valve 11 are opened, the row of closing
Air valve 12.Since third solenoid valve 11 is in open state, the first control valve 8 and the second control valve are opened, and then gas tank 4 is to quilt
It surveys part 13 and standard component 14 is filled with gas, at this point, pressure sensor 7 measures air pressure in measured piece and standard component, and judge air pressure
Whether close to K values；
(4) if measured piece and standard component air pressure inside constantly repeat step 2 and step 3, until tested also not close to K values
Part and standard component air pressure inside are close to K values；
(5) the first solenoid valve 3, second solenoid valve 5, bypass solenoid valve 6, third solenoid valve 11 and air bleeding valve 12 are closed, it is quiet
It sets and reads the value of difference gauge 10 after a period of time and show measured piece if draught head is more than or equal to the leakage upper pressure limit of setting
13 there are leakage problem, if draught head is less than the leakage upper pressure limit of setting, shows that leakage problem is not present in measured piece；
(6) after the completion of testing, air bleeding valve 12 is opened, the gas inside measured piece 13 and standard component 14 is discharged.
It is described the invention in detail above in association with embodiment, but the content is only the preferable implementation of the present invention
Example should not be construed as limiting the practical range of the present invention.It is all according to all the changes and improvements made by the present patent application range
Deng within the patent covering scope that should all still fall within the present invention.
Claims (10)
1. a kind of inflation method from high-pressure air source to workpiece, which is characterized in that it includes the following steps：
(1) sequentially connected first valve, gas tank and the second valve are set between high-pressure air source and workpiece；
(2) first valves are connected, and the second valve disconnects, and high-pressure air source is inflated to gas tank；
(3) first valves disconnect, and the second valve conducting, gas tank is inflated to workpiece；
(4) step (2) and (3) is repeated, the first valve of break-make and the second valve are replaced so that high-pressure air source is via gas tank to workpiece
Inflation reaches preset pressure.
2. according to claim 1 from high-pressure air source to the inflation method of workpiece, it is characterised in that：In the step (2),
It is equipped with accurate adjustment pressure valve between first valve and high-pressure air source, passes through the air pressure of gas tank after the control inflation of accurate adjustment pressure valve.
3. according to claim 1 from high-pressure air source to the inflation method of workpiece, it is characterised in that：In the step (3),
Gas piping between second valve and workpiece is equipped with pressure sensor, judges inside workpiece air pressure by pressure sensor
Value.
4. a kind of air charging system from high-pressure air source to workpiece, which is characterized in that it, which is included between high-pressure air source and workpiece, sets
The buffer unit set, the buffer unit include sequentially connected first valve, gas tank and the second valve, high-pressure air source and the
One valve connects, and workpiece is connect with the second valve.
5. according to claim 4 from high-pressure air source to the air charging system of workpiece, it is characterised in that：First valve and height
It is equipped with accurate adjustment pressure valve between pressurized air source, passes through the air pressure of gas tank after the control inflation of accurate adjustment pressure valve.
6. according to claim 4 from high-pressure air source to the air charging system of workpiece, it is characterised in that：Second valve and work
Gas piping between part is equipped with pressure sensor, judges inside workpiece atmospheric pressure value by pressure sensor.
7. a kind of differential pressure air-leakage detector of inflation method based on claim 1 from high-pressure air source to workpiece, feature exist
In：It includes sequentially connected high-pressure air source, coarse adjustment pressure valve, accurate adjustment pressure valve, buffer unit, and respectively with buffer unit outlet
The first control valve and the second control valve of mouth connection, connect and are furnished with pressure sensing on the gas pipeline at buffer unit gas outlet
Device, between the gas outlet of the first control valve and the gas outlet of the second control valve be equipped with difference gauge, the buffer unit include according to
The air inlet of the first solenoid valve, gas tank and the second solenoid valve of secondary connection, the first solenoid valve is connect with the gas outlet of accurate adjustment pressure valve,
The air inlet of first control valve and the second control valve is connect with the gas outlet of second solenoid valve.
8. differential pressure air-leakage detector according to claim 7, it is characterised in that：The accurate adjustment pressure valve and the pressure
Bypass solenoid valve is additionally provided between force snesor, bypass solenoid valve connect to be formed with the first solenoid valve, gas tank and second solenoid valve
Gas circuit it is in parallel, the air inlet for bypassing solenoid valve is connect with the gas outlet of accurate adjustment pressure valve, gas outlet respectively with the first control valve and
Second control valve connects.
9. differential pressure air-leakage detector according to claim 7, it is characterised in that：First control valve and described
Second control valve is all made of pneumatic operated valve, and the control terminal of the first control valve and the second control valve is connected with third solenoid valve, third electricity
The air inlet of magnet valve is connect with the gas outlet of coarse adjustment pressure valve.
10. differential pressure air-leakage detector according to claim 7, it is characterised in that：First control valve and second
The air inlet of control valve is respectively connected with air bleeding valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810695080.5A CN108627308A (en) | 2018-06-29 | 2018-06-29 | From high-pressure air source to the inflation method of workpiece, air charging system and differential pressure air-leakage detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810695080.5A CN108627308A (en) | 2018-06-29 | 2018-06-29 | From high-pressure air source to the inflation method of workpiece, air charging system and differential pressure air-leakage detector |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109883616A (en) * | 2019-03-28 | 2019-06-14 | 中国石油化工股份有限公司 | A kind of shield grease special measuring of resistance to water tightness instrument and test method |
| CN109883685A (en) * | 2019-04-09 | 2019-06-14 | 山东鲁泰控股集团有限公司石墨烯高分子复合材料研发中心 | A kind of detection device and application method of solenoid valve |
| CN112045833A (en) * | 2020-07-29 | 2020-12-08 | 新兴铸管股份有限公司 | Method and device for maintaining ductile cast iron pipe |
| CN113933467A (en) * | 2021-10-26 | 2022-01-14 | 国网浙江省电力有限公司电力科学研究院 | Sulfur hexafluoride decomposition product gas pressure monitoring device based on gas in-situ detection |
| CN114408208A (en) * | 2021-12-24 | 2022-04-29 | 国营四达机械制造公司 | Access type pressure detection and control equipment and method |
| CN115993215A (en) * | 2021-10-20 | 2023-04-21 | 宁德时代新能源科技股份有限公司 | Air filling device, air tightness testing device, air filling method and air tightness testing method |
| CN117990301A (en) * | 2024-04-03 | 2024-05-07 | 宁德时代新能源科技股份有限公司 | Air tightness detection system |
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