CN108151985A - A kind of external pressure direct pressure closing test device for air tightness - Google Patents
A kind of external pressure direct pressure closing test device for air tightness Download PDFInfo
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- CN108151985A CN108151985A CN201810044174.6A CN201810044174A CN108151985A CN 108151985 A CN108151985 A CN 108151985A CN 201810044174 A CN201810044174 A CN 201810044174A CN 108151985 A CN108151985 A CN 108151985A
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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
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Abstract
The present invention relates to a kind of external pressure direct pressure closing test device for air tightness, including：Power circuit, cpu controller, air-tightness detection device, collecting unit and system pneumatic circuit；System pneumatic circuit includes electromagnetic valve component, compressed gas source, buffer container, volumetric standard and pressure transmitter, electromagnetic valve component includes filtering pressure regulator valve, precise pressure regulating valve, Prefill valve, throttle valve, charge valve, vent valve and switch valve with two-position and five-pass, compressed gas source is connected by conduit with filtering the inlet end of pressure regulator valve, the outlet side of filtering pressure regulator valve is connected respectively with the inlet end of precise pressure regulating valve, switch valve with two-position and five-pass, and the outlet side of precise pressure regulating valve is connected by Prefill valve with the inlet end of buffer container.The present invention realizes the air-leakage test of video camera and quickly judges that video camera whether there is the function of leaking greatly, has many advantages, such as that system detectio precision is high, detection efficiency is high, high degree of automation.
Description
Technical field
The present invention relates to air-leakage test technical field, more particularly to a kind of external pressure direct pressure closing test device for air tightness.
Background technology
Air-leakage test technology be widely used to the national defense industry such as aerospace, electronics, core, weapons, ship and oil,
The industries such as chemical industry, security protection, automobile, food, medical treatment.A large amount of case fact explanations, after product leaks, may lead to its performance
It degenerates, service life greatly shortens.Therefore, the reason of leaking conscientiously is identified and analysed, air-tightness is thoroughly appreciated and understood
Measuring mechanism seems particularly significant.
Common air tightness detection equipment is designed mostly according to gas flow formula in industrial production.Air-tightness at present
Detection method mainly has bubble type detection method and vapour-pressure type detection method, and wherein vapour-pressure type detection method is in the industrial production using wide
It is general.Vapour-pressure type detection method can be divided into direct press type and differential pressure type air-tightness detection method again.Differential pressure method with standard component as reference,
The error that the factors such as portion temperature are brought can be offset, but differential pressure method cost is higher, structure is more complicated；Traditional direct press type detection
Method cost is relatively low, simple in structure, but temperature influence is relatively large, and detection efficiency and precision are relatively low.Under normal circumstances, this
Both of which is to calculate slip by detecting interiors of products pressure, difficult to realize to detect interiors of products pressure and be not easy
Realize the quick big leak detection of product.Such as inspection of the above two air-tightness detection method for the hermetically sealed property device such as video camera
It looks into and is just difficult to be applicable in.
Invention content
To solve the above-mentioned problems, it the present invention provides a kind of external pressure direct pressure closing test device for air tightness, solves existing
The air-tightness detection method of mainstream can not detect the problem of the hermetically sealed property device such as video camera, realize the air-tightness of video camera etc.
Detection and it is quick judge that video camera whether there is the function of leaking greatly, have system detectio precision is high, reliability is high, it is at low cost, examine
The advantages that surveying efficient, high degree of automation.
To achieve these goals, the present invention is realized using following technical scheme：External pressure direct pressure closing air tightness test fills
It puts, including：Power circuit, control system, air-tightness detection device, collecting unit and system pneumatic circuit, the system gas
Dynamic circuit includes：Electromagnetic valve component, compressed gas source, buffer container, volumetric standard and pressure transmitter, the solenoid valve block
Part includes filtering pressure regulator valve, precise pressure regulating valve, Prefill valve, throttle valve, charge valve, vent valve and switch valve with two-position and five-pass, described
Compressed gas source by conduit with filter pressure regulator valve inlet end be connected, it is described filtering pressure regulator valve outlet side respectively with precision
Inlet end, the switch valve with two-position and five-pass of pressure regulator valve are connected, and the outlet side of the precise pressure regulating valve is held by Prefill valve and buffering
The inlet end of device is connected, and the outlet side of the buffer container is connected by charge valve with volumetric standard, and the standard is held
Device is also connected with vent valve.
The cpu controller is connected respectively with Analog input mModule AI, digital quantity input/output module DI/DO；
The digital quantity input/output module DI/DO is commutated by conducting wire with Prefill valve, charge valve, vent valve, two-position five-way respectively
Valve is connected, and realizes the processing and control of digital data；
The collecting unit includes pressure sensor Pn, pressure sensor PmAnd limit switch, the limit switch are set
It puts and pressure sensor P is provided in compression cylinder bottom, the buffer containerm, pressure is provided in the volumetric standard
Force snesor Pn, pressure sensor Pm、PnIt is connected by pressure transmitter with Analog input mModule AI, the limiting
Switch is connected with Analog input mModule AI.
The air-tightness detection device includes platform floor, and the platform floor bottom symmetrical is provided with four platforms
Pedestal, the platform floor upper-end front both sides are provided with start button and reset and scram button, the platform floor
Pneumatic cabinet is provided on the left of upper rear, right side is provided with electrical control cabinet, the platform floor upper end, positioned at Pneumatic cabinet with
Detection device fixture is additionally provided between start button, detection device fixture lower section is set positioned at platform floor upper end
There is volumetric standard, compression cylinder, Prefill valve, charge valve, vent valve, switch valve with two-position and five-pass are provided in the detection device
And buffer container is installed in Pneumatic cabinet, the filtering pressure reducing valve and precise pressure regulating valve are arranged on the outside of Pneumatic cabinet, described
Control system, collecting unit be arranged in electrical control cabinet, the front panel of the electrical control cabinet is set successively from top to bottom
Status indicator lamp, manual operation knob and graphic control panel are equipped with, the graphic control panel is connected with cpu controller.
The power circuit includes single-phase 220V alternating currents main power source and 24V Switching Power Supplies, the main electricity of the alternating current
Source is connected with 24V Switching Power Supplies by conducting wire, 24V Switching Power Supplies by conducting wire be respectively cpu controller, pressure sensor,
Electromagnetic valve component, limit switch and status indicator lamp power supply.
As a kind of optimal technical scheme of the design, the detection device fixture include be connected on platform floor,
Symmetrically arranged two pieces of support side plates are provided with reinforcement connecting rod, the support side plate described in two pieces between the support side plate
Upper end is provided with cylinder mounting plate, and the compression cylinder is located at cylinder mounting plate upper end, and the compression cylinder lower end passes through
Flanged joint is provided with cavity volume upper cover, and the compression cylinder is connected by throttle valve with switch valve with two-position and five-pass.
As a kind of optimal technical scheme of the design, piston rod and the flanged joint bar upper end of the compression cylinder lower end
Closely-pitched internal thread hole is connected by thread fitting, and is passed through spring block and locked the two, in order to be applicable in different model production
The air-leakage test of product needs to design different volumetric standard (product cavity volume), when replacing different product cavity volume, cavity volume upper cover
It is also required to replace, so, the cavity volume upper cover consideration being connect with compression cylinder piston rod is designed to flange link mechanism rather than one
Body formula non-removable structure, the flanged joint bar bottom end are spherical, and flanged joint bar bottom is by connecting flange with holding
Chamber upper cover is connected, and backing plate, connecting flange inside and spherical surface are provided between spherical flanged joint bar bottom and cavity volume upper cover
The place of type flanged joint bar contact is coordinated using yielding rubber.
As a kind of optimal technical scheme of the design, the volumetric standard is two-part structure, and volumetric standard includes
Upper container and bottom container, the upper container upper end are provided with upper container sealed groove, and bottom container upper end is provided with
Bottom container sealed groove is both provided with O-ring seal in the upper container sealed groove, bottom container sealed groove,
It is tightly connected between upper container and bottom container by O-ring seal, passes through O between upper container when cavity volume upper cover declines
Type sealing ring is sealed, and the bottom container both sides are respectively arranged with pipe screw thread air admission hole and pipe screw thread pressure port, described
Pressure port and pressure sensor PnIt is connected by thread fitting, vent valve, the lower part is provided on the air admission hole
Container bottom has been connected by screw connecting bottom board, and the connecting bottom board is fixed by screws on platform floor.
As a kind of optimal technical scheme of the design, the material of the volumetric standard is synthetic resin POM.
As a kind of optimal technical scheme of the design, muffler is provided on the switch valve with two-position and five-pass.
As a kind of optimal technical scheme of the design, the Standard Cylinder is reciprocating, vertically arranged standard
Cylinder with professional air supported head, ensures the reliability of sealing by self-adjusting.
As a kind of optimal technical scheme of the design, the table top uses the nonstandard Precision Machining of structural steel, electrical control
Cabinet makes according to specific requirement non-standard de-sign.
As a kind of optimal technical scheme of the design, the purpose of the buffer container is mainly to exclude the serious of product to let out
Leakage situation.If without using reference volume, provide pressure by air source and enter instrument, due to product serious leak, the inside of fixture
What is formed is an entirety, and internal pressure is not any change, and instrument can be judged as qualified products.
Beneficial effects of the present invention are：
1st, each link volumetric standard volume is demarcated, it is ensured that the accuracy of subsequent experimental sets buffer container, leads to
The actual pressure and calculated value after the inflation of standard of comparison container are crossed, the function of detecting big missing part in advance is realized, also reduces
Stabilization sub stage required time, detection efficiency is effectively increased, volume identification is carried out to buffer container using aeration, it is real
Show online automatic detection containment vessel volume, improve the automatic performance of entire detection process.
2nd, system using touch screen technology, selects high-precision pressure sensor by using PLC controller, have compared with
Good accuracy of detection and repeatability, and visual good, high degree of automation, can be used for the online batch detection of factory.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is a kind of pneumatic circuit schematic diagram of external pressure direct pressure closing test device for air tightness；
Fig. 2 is the Control system architecture block diagram of the present invention；
Fig. 3 is the air-tightness detection device structure diagram of the present invention；
Fig. 4 is the front view of air-tightness detection device in the present invention；
Fig. 5 is the structure diagram of detection device fixture in Fig. 3；
Fig. 6 is the partial enlarged view at A in Fig. 5；
Fig. 7 is the sectional view of flange link mechanism in Fig. 5；
Fig. 8 is the sectional view of Plays container of the present invention.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Conjunction is specifically illustrating, and the present invention is further explained, it should be noted that in the absence of conflict, embodiment in the application and
Feature in embodiment can be combined with each other.
As shown in Figures 1 to 8, a kind of external pressure direct pressure closing test device for air tightness, including：Power circuit, cpu controller,
Air-tightness detection device, collecting unit and system pneumatic circuit, the system pneumatic circuit include：Electromagnetic valve component, compression
Air source, buffer container, volumetric standard 3 and pressure transmitter, the electromagnetic valve component include filtering pressure regulator valve, accurate voltage regulating
Valve, Prefill valve, throttle valve 36, charge valve, vent valve and switch valve with two-position and five-pass, the compressed gas source pass through conduit and filtering
The inlet end of pressure regulator valve is connected, it is described filtering pressure regulator valve outlet side respectively with the inlet end of precise pressure regulating valve, two-position five-way
Reversal valve is connected, and the outlet side of the precise pressure regulating valve is connected by Prefill valve with the inlet end of buffer container, described slow
The outlet side for rushing container is connected by charge valve with volumetric standard 3, and the volumetric standard 3 is also connected with vent valve, mistake
Filter pressure regulator valve is used for realizing dry filter and the coarse adjustment to compressed gas source gas, and precise pressure regulating valve is used to provide to buffer container big
Small accurate pressure.
The collecting unit includes pressure sensor Pn, pressure sensor PmWith limit switch 37, the limit switch
37 are arranged on 1 bottom of compression cylinder, prevent 1 overvoltage of compression cylinder, pressure sensor P is provided in the buffer containerm, institute
Pressure sensor P is provided in the volumetric standard 3 statedn, pressure sensor Pm, pressure sensor PnBy pressure transmitter with
Analog input mModule AI is connected, and pressure transmitter is arranged in the pipeline of buffer container and volumetric standard 3, is responsible for real
Its pressure change of Shi Jilu, the limit switch 37 are connected with Analog input mModule AI, and Analog input mModule AI is born
Blame the acquisition of pressure sensor data, pressure sensor PmFor detecting the blowing pressure size in buffer container, ensure standard
Pressure energy in container 3 meets the test pressure of workpiece, pressure sensor PnFor acquiring the pressure change in volumetric standard 3,
By data analysis and process, test piece slip size is finally calculated.
The air-tightness detection device includes platform floor 7, and there are four flat for 7 bottom symmetrical of platform floor setting
Table foot seat 6, the 7 upper-end front both sides of platform floor are provided with start button 5 and reset and scram button 8, and described is flat
7 upper rear of platform bottom plate left side is provided with Pneumatic cabinet 2, right side is provided with electrical control cabinet 12,7 upper end of platform floor,
Detection device fixture is additionally provided between Pneumatic cabinet 2 and start button 5, the volumetric standard (3) is pressed from both sides in detection device
Tool lower section, positioned at platform floor (7) upper end, compression cylinder (1) is set on detection means, Prefill valve, charge valve, vent valve,
Switch valve with two-position and five-pass and buffer container are installed in Pneumatic cabinet 2, and the filtering pressure reducing valve 4 and precise pressure regulating valve are arranged on
2 outside of Pneumatic cabinet.
The control system, collecting unit are arranged in electrical control cabinet 12, before the electrical control cabinet 12
Plate is disposed with status indicator lamp 11, manual operation knob 10 and graphic control panel 9 (HMI) from top to bottom；The industry
Touch screen 9 is connected with cpu controller, and the slave computer of detecting system of the present invention is completed by cpu controller, the man-machine friendship of industry spot
It is mutually completed by graphic control panel 9, data acquisition is real under LabVIEW software environments by PC machine with system performance testing and calibration
It is existing.
The power circuit includes single-phase 220V alternating currents main power source and 24V Switching Power Supplies, the main electricity of the alternating current
Source is connected with 24V Switching Power Supplies by conducting wire, 24V Switching Power Supplies by conducting wire be respectively cpu controller, pressure sensor,
Electromagnetic valve component, limit switch 37 and status indicator lamp 11 are powered.
As a kind of optimal technical scheme of the design, the detection device fixture include be connected on platform floor 7,
Symmetrically arranged two pieces of support side plates 31 are provided between the support side plate 31 and strengthen connecting rod 32, the branch described in two pieces
31 upper end of support side plate is provided with cylinder mounting plate 33, and the compression cylinder 1 is located at 33 upper end of cylinder mounting plate, the compression
1 lower end of cylinder is provided with cavity volume upper cover 35 by flange connection, this is because the air-tightness of different model video camera products
Detection, needs to design different volumetric standards, and when replacing different product volumetric standard, cavity volume upper cover is also required to replace, so,
The cavity volume upper cover 35 being connect with the piston rod of compression cylinder 1 is designed to flange link mechanism and non-Unitary non-removable structure,
The compression cylinder 1 is connected by throttle valve 36 with switch valve with two-position and five-pass, and compression cylinder 1 is in switch valve with two-position and five-pass
Under control, the sealing to volumetric standard 3 and opening are realized.
As a kind of optimal technical scheme of the design, piston rod and the flanged joint bar 38 of 1 lower end of compression cylinder
Upper end closely-pitched internal thread hole is connected by thread fitting, and is passed through spring block and locked the two, the flanged joint
38 bottom end of bar is spherical, and by using spherical surface auxiliary structure, the planar contact pair design of relatively traditional face knead dough contact, advantage is
When volumetric standard 3 because when processing or installation reason lead to not severity, cavity volume upper cover 35 is under the promotion of compression cylinder 1
Minute angle can be rotated to ensure the sealing of volumetric standard 3, while 38 radial forces of flanged joint bar will not be caused too big
And causing piston rod deformation failure, 38 bottom of flanged joint bar is connected by connecting flange 34 with cavity volume upper cover 35, spherical
Backing plate, 34 inside of connecting flange and spherical flanged joint bar 38 are provided between 38 bottom of flanged joint bar and cavity volume upper cover 35
The place of contact is coordinated using yielding rubber, and certain cushioning effect is played in loading process is compressed.
As a kind of optimal technical scheme of the design, the volumetric standard 3 is two-part structure, and volumetric standard 3 wraps
Upper container 25 and bottom container 26 are included, 25 upper end of upper container is provided with upper container sealed groove 21, bottom container
26 upper ends are provided with bottom container sealed groove 22, in the upper container sealed groove 21, bottom container sealed groove 22
O-ring seal is both provided with, is tightly connected between upper container 25 and bottom container 26 by O-ring seal, cavity volume upper cover 35
It is sealed between upper container 25 by O-ring seal during decline, 26 both sides of bottom container are respectively arranged with pipe
Thread inleting hole 23 and pipe screw thread pressure port 24, the pressure port 24 and pressure sensor PnIt is connected by thread fitting, institute
Vent valve is provided on the air admission hole 23 stated, 26 bottom of bottom container has been connected by screw connecting bottom board 27, described
Connecting bottom board 27 be fixed by screws on platform floor 7, connecting bottom board 27 can convenient container disassembling, assembling and replacing, while energy
Ensure the sealing of volumetric standard 3.
It, need to be to the volumetric standard 3 to ensure the accuracy of subsequent experimental as a kind of optimal technical scheme of the design
The volume of each link is demarcated；Its material is synthetic resin POM, because when product carries out loading, unloading, it is difficult to avoid occurring
Product and volumetric standard 3 collide, and tested analyte detection has been impermissible for abrasion or bruise mark, select synthetic resin that can slow down abrasion.
As a kind of optimal technical scheme of the design, muffler is provided on the switch valve with two-position and five-pass.
As a kind of optimal technical scheme of the design, the cpu controller is PLC controller.
As a kind of optimal technical scheme of the design, the pressure sensor PnRequired precision highest, it is mounted on
In volumetric standard, changing value directly participates in the calculating of slip, so high-precision gauge pressure type pressure sensor is selected, and PmIt adopts
The data of collection are mainly used for judging the whether big leakage of measured object and calibration system effective volume, and choice accuracy is compared with PnLower gauge pressure type
Pressure sensor.
Device realizes dry filter to compressed gas source gas and coarse adjustment by filtering pressure regulator valve, is by precise pressure regulating valve
Buffer container provides the accurate pressure of size, pressure sensor PmDetect the blowing pressure size in buffer container；Control system
The work of throttle valve 36 is controlled by switch valve with two-position and five-pass, realizes control compression cylinder 1, the work of 1 lower end of control compression cylinder
Stopper rod drives cavity volume upper cover 35 to decline, and realizes the sealing to volumetric standard 3, is arranged on the limit switch 37 of 1 bottom of compression cylinder,
Prevent 1 overvoltage of compression cylinder；When carrying out air-leakage test using apparatus of the present invention, in automatic running operation, manually by workpiece
It is put in volumetric standard, by both hands start button, cylinder declines automatically, and volumetric standard is blocked, and starts detecting instrument and carries out
-- balance -- test -- is deflated, and detection cycle is completed for inflation.If workpiece sensing is qualified, qualified indicator light is bright, on cylinder is automatic
Rise to reset condition.If workpiece is unqualified, unqualified indicator light is bright, and cylinder is failure to actuate, the stop button for the box that needs to touch the button
It is resetted, cylinder returns to reset condition, if it is desired to continuing to test to this unqualified workpiece, need to press both hands startup, instrument after 3 seconds
Continue the detection of a cycle, testing result has been stored in instrument.In manual operation operation, workpiece is manually put in standard
In container, automatic/automatic knob is rotated to " manual ", presses lifting cylinder button, cylinder declines, volumetric standard is blocked,
It presses inflation instrument manually to start to inflate and -- balances -- test -- deflation, detection cycle is completed.If you need to stop halfway, hand need to be first pressed
Dynamic stop button, then lifting cylinder button is pressed, cylinder release is made to rise to reset condition.Carry out products air tightness test, test
Process analyzed for four stages there are four stage, i.e. aeration phase, equilibrium stage, test leak detection stage and releasing phase：
(1) aeration phase：Charge valve is opened after volumetric standard 3 is sealed, it will be in the buffer container with certain pressure
Gas is filled in volumetric standard.Since inflation can cause gas and chamber wall that frequent impact occurs, so as to generate shock oscillation, this
When gas pressure and temperature can all be fluctuated, it is necessary to gaseous state is waited for stablize, by comparing inflate after pressure
Theoretical pressure value when not leaked with workpiece judges the whether big leakage of workpiece, if big leakage, is then immediately finished test.
(2) equilibrium stage：After treating that the inflation of volumetric standard 3 is completed, charge valve is closed.Because the switching effect meeting of solenoid valve
Gas pressure in volumetric standard 3 is caused to shake, it is unstable so as to cause gaseous state in volumetric standard 3, it is necessary to wait for gas shape
State is restored to be detected into test phase after stablizing.
(3) test phase：Within the preset testing time, 3 pressure sensor P of record standard containernData, will
Data carry out calculation processing and analysis, can calculate the slip size of test piece, the slip of solution and the threshold of setting
Value, which is compared, can show that final detection is result.
(4) releasing phase：After test phase, vent valve is opened and is deflated, opens simultaneously the volumetric standard being sealed
3, terminate a test period.
In order to improve system detectio efficiency, after inflation, Prefill valve is opened simultaneously, by the pressure tune in buffer container
To preset value.
The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the description in above embodiments and description only illustrates the present invention
Principle, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these change and change
Into all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent
It defines.
Claims (6)
1. a kind of external pressure direct pressure closing test device for air tightness, it is characterised in that：Including air-tightness detection device, collecting unit and it is
System pneumatic circuit, the system pneumatic circuit include：Electromagnetic valve component, compressed gas source, buffer container, volumetric standard (3) with
And pressure transmitter, the electromagnetic valve component include filtering pressure regulator valve, precise pressure regulating valve, Prefill valve, throttle valve (36), inflation
Valve, vent valve and switch valve with two-position and five-pass, the compressed gas source are connected by conduit with filtering the inlet end of pressure regulator valve, institute
It states inlet end of the outlet side of filtering pressure regulator valve respectively with the inlet end of precise pressure regulating valve, switch valve with two-position and five-pass to be connected, institute
The outlet side for stating precise pressure regulating valve is connected by Prefill valve with the inlet end of buffer container, and the switch valve with two-position and five-pass goes out
Gas end is connected by throttle valve (36) with compression cylinder (1), and the outlet side of the buffer container is held by charge valve and standard
Device (3) is connected, and the volumetric standard (3) is also connected with vent valve；
The collecting unit includes pressure sensor Pn, pressure sensor PmWith limit switch (37), the limit switch
(37) it is arranged on compression cylinder (1) bottom and is connected with Analog input mModule AI, the pressure sensor PmIt is buffering
In container, the pressure sensor PnIn volumetric standard (3), pressure sensor Pm, pressure sensor PnBecome by pressure
Device is sent to be connected with Analog input mModule AI；
The air-tightness detection device includes platform floor (7), and there are four flat for the setting of the platform floor (7) bottom symmetrical
Table foot seat (6), the platform floor (7) upper-end front both sides are provided with start button (5) and reset and scram button (8),
Pneumatic cabinet (2) is provided on the left of described platform floor (7) upper rear, right side is provided with electrical control cabinet (12), detection dress
The fixture put is in platform floor (7) upper surface, between Pneumatic cabinet (2) and start button (5), the volumetric standard (3)
Below detection device fixture, positioned at platform floor (7) upper end, compression cylinder (1) is set on detection means, the preliminary filling
Valve, charge valve, vent valve, switch valve with two-position and five-pass and buffer container are installed in Pneumatic cabinet (2), the filtering pressure reducing valve
(4), precise pressure regulating valve is arranged on the outside of Pneumatic cabinet (2), and the cpu controller, collecting unit are arranged at electrical control cabinet
(12) in, the front panel of the electrical control cabinet (12) is disposed with status indicator lamp (11), manual operation rotation from top to bottom
Button (10) and graphic control panel (9), the graphic control panel (9) are connected with cpu controller by conducting wire.
2. external pressure direct pressure closing test device for air tightness according to claim 1, it is characterised in that：The detection device folder
Tool includes two pieces of support side plates (31) being connected on platform floor (7), and the support side plate is provided with reinforcement between (31)
Connecting rod (32), support side plate (31) upper end described in two pieces are provided with cylinder mounting plate (33), the compression cylinder (1) position
In cylinder mounting plate (33) upper end, the compression cylinder (1) telescopic end is provided with cavity volume upper cover by flange connection
(35)。
3. external pressure direct pressure closing test device for air tightness according to claim 2, it is characterised in that：The compression cylinder (1)
The piston rod of lower end is connect with flanged joint bar (38) upper end closely-pitched internal thread hole by thread fitting, and will by spring block
The two is locked, and described flanged joint bar (38) bottom end is spherical, and flanged joint bar (38) bottom passes through connecting flange
(34) it is connected with cavity volume upper cover (35), pad is provided between spherical flanged joint bar (38) bottom and cavity volume upper cover (35)
The place of plate, connecting flange (34) inside and spherical flanged joint bar (38) contact is coordinated using yielding rubber.
4. external pressure direct pressure closing test device for air tightness according to claim 1, it is characterised in that：The volumetric standard
(3) for two-part structure, volumetric standard (3) includes upper container (25) and bottom container (26), on the upper container (25)
End is provided with upper container sealed groove (21), and bottom container (26) upper end is provided with bottom container sealed groove (22), described
Upper container sealed groove (21), be both provided with O-ring seal in bottom container sealed groove (22), upper container (25) with
Bottom container is tightly connected between (26) by O-ring seal, is led between upper container (25) when cavity volume upper cover (35) declines
It crosses O-ring seal to be sealed, the bottom container (26) both sides are respectively arranged with pipe screw thread air admission hole (23) and pipe screw thread
Pressure port (24), the pressure port (24) and pressure sensor PnIt is connected by thread fitting, on the air admission hole (23)
Vent valve is provided with, the bottom container (26) bottom has been connected by screw connecting bottom board (27), the connecting bottom board
(27) it is fixed by screws on platform floor (7).
5. external pressure direct pressure closing test device for air tightness according to claim 4, it is characterised in that：The volumetric standard (3)
Volume in links is demarcated, and material is synthetic resin POM.
6. external pressure direct pressure closing test device for air tightness according to claim 1, it is characterised in that：The pressure sensor
PnAnd PmFor high-precision gauge pressure type pressure sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810044174.6A CN108151985A (en) | 2018-01-17 | 2018-01-17 | A kind of external pressure direct pressure closing test device for air tightness |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810044174.6A CN108151985A (en) | 2018-01-17 | 2018-01-17 | A kind of external pressure direct pressure closing test device for air tightness |
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| CN111929743A (en) * | 2020-08-05 | 2020-11-13 | 天津达祥精密工业有限公司 | Workpiece core breaking detection device |
| CN111947864A (en) * | 2020-09-21 | 2020-11-17 | 湖南兵器建华精密仪器有限公司 | Automatic sealing detector |
| CN112067209A (en) * | 2020-09-18 | 2020-12-11 | 武汉德泰纳新能源技术有限公司 | Integral air tightness detection method for charging component for vehicle |
| CN112113720A (en) * | 2020-09-14 | 2020-12-22 | 福建省产品质量检验研究院 | Multistation ball gas tightness testing arrangement |
| CN112414644A (en) * | 2020-11-10 | 2021-02-26 | 浙江巨程钢瓶有限公司 | Air tightness detection system for steel cylinder and detection method thereof |
| CN113865803A (en) * | 2021-09-28 | 2021-12-31 | 师大瑞利光电科技(清远)有限公司 | Tightness detection device |
-
2018
- 2018-01-17 CN CN201810044174.6A patent/CN108151985A/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109238592A (en) * | 2018-11-03 | 2019-01-18 | 北京京精医疗设备有限公司 | A kind of pump line pipeline device for detecting sealability |
| CN111929743A (en) * | 2020-08-05 | 2020-11-13 | 天津达祥精密工业有限公司 | Workpiece core breaking detection device |
| CN111929743B (en) * | 2020-08-05 | 2023-08-04 | 天津达祥精密工业有限公司 | Workpiece broken core detection device |
| CN112113720A (en) * | 2020-09-14 | 2020-12-22 | 福建省产品质量检验研究院 | Multistation ball gas tightness testing arrangement |
| CN112067209A (en) * | 2020-09-18 | 2020-12-11 | 武汉德泰纳新能源技术有限公司 | Integral air tightness detection method for charging component for vehicle |
| CN111947864A (en) * | 2020-09-21 | 2020-11-17 | 湖南兵器建华精密仪器有限公司 | Automatic sealing detector |
| CN112414644A (en) * | 2020-11-10 | 2021-02-26 | 浙江巨程钢瓶有限公司 | Air tightness detection system for steel cylinder and detection method thereof |
| CN113865803A (en) * | 2021-09-28 | 2021-12-31 | 师大瑞利光电科技(清远)有限公司 | Tightness detection device |
| CN113865803B (en) * | 2021-09-28 | 2024-02-20 | 师大瑞利光电科技(清远)有限公司 | Tightness detection device |
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