CN208171536U - 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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- CN208171536U CN208171536U CN201820075315.6U CN201820075315U CN208171536U CN 208171536 U CN208171536 U CN 208171536U CN 201820075315 U CN201820075315 U CN 201820075315U CN 208171536 U CN208171536 U CN 208171536U
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Abstract
The utility model relates to a kind of external pressure direct pressure closing test device for air tightness, including：Power circuit, cpu controller, air-tightness detection device, acquisition 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 the inlet end of filtering pressure regulator valve, the outlet side of filtering pressure regulator valve is connected with the inlet end of precise pressure regulating valve, switch valve with two-position and five-pass respectively, and the outlet side of precise pressure regulating valve is connected by Prefill valve with the inlet end of buffer container.The utility model 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 detection precision is high, detection efficiency is high, high degree of automation.
Description
Technical field
The present invention relates to air-leakage test technical field, in particular to a kind of external pressure direct pressure closing test device for air tightness.
Background technique
Air-leakage test technology be widely used to the national defense industry such as aerospace, electronics, core, weapons, ship and petroleum,
The industries such as chemical industry, security protection, automobile, food, medical treatment.A large amount of case fact explanations, after product leaks, may cause 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 according to gas flow formula mostly 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 applied extensively in the industrial production
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 use standard component as reference,
The factors bring error such as portion temperature can be offset, but differential pressure method higher cost, structure are more complex；Traditional direct press type detection
Cost is relatively low for method, structure is simple, 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 testing product internal pressure, is difficult to realize testing product internal pressure and is not easy
Realize the quick big leak detection of product.Such as the inspection of above two air-tightness detection method property device hermetically sealed for video camera etc.
It looks into and is just difficult to be applicable in.
Summary of the invention
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 judges that video camera whether there is the function of leaking greatly with quick, has system detection precision height, high reliablity, at low cost, inspection
The advantages that surveying high-efficient, high degree of automation.
To achieve the goals above, the present invention is realized using following technical scheme：External pressure direct pressure closing air tightness test dress
It sets, including：Power circuit, control system, air-tightness detection device, acquisition 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 filtering 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.
Cpu controller is connected with Analog input mModule AI, digital quantity input/output module DI/DO respectively；Described
Digital quantity input/output module DI/DO is connected with Prefill valve, charge valve, vent valve, switch valve with two-position and five-pass respectively by conducting wire
It connects, realizes the processing and control of digital data；
The acquisition unit includes pressure sensor Pn, pressure sensor PmAnd limit switch, the limit switch are set
It sets and is provided with pressure sensor P 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 limit
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 two 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, be located at Pneumatic cabinet with
Detection device fixture is additionally provided between start button, the detection device fixture lower section is located at the setting of 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, filtering pressure reducing valve and precise pressure regulating valve are arranged on the outside of Pneumatic cabinet, the control
System, acquisition unit are arranged in electrical control cabinet, and the front panel of the electrical control cabinet is disposed with shape from top to bottom
State indicator light, manual operation knob and graphic control panel, the graphic control panel are connected with cpu controller.
The power circuit includes single-phase 220V alternating current main power source and 24V Switching Power Supply, the main electricity of the alternating current
Source is connected with 24V Switching Power Supply by conducting wire, 24V Switching Power Supply 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, 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 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, the piston rod of the compression cylinder lower end and flanged joint bar upper end
Closely-pitched internal thread hole is locked the two by spring block by being threadedly engaged connection, is produced to be applicable in different model
The air-leakage test of product needs to design different volumetric standards (product cavity), when replacing different product cavity, cavity upper cover
Be also required to replace, so, the consideration of the cavity upper cover that is connect with compression cylinder piston rod be 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 and holds
Chamber upper cover is connected, and backing plate, connecting flange inside and spherical surface are provided between spherical flanged joint bar bottom and cavity upper cover
The place of type flanged joint bar contact is cooperated 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 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 upper cover declines
Type sealing ring is sealed, and the bottom container two sides are respectively arranged with pipe screw thread air inlet and pipe screw thread pressure port, described
Pressure port and pressure sensor PnBy being threadedly engaged connection, vent valve, the lower part are provided on the air inlet
Container bottom has been connected by screw to 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 guarantees the reliability of sealing by self-adjusting with professional air supported head.
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 seriously letting out for product
Leak situation.If not using reference volume, pressure is provided by gas source and enters 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 judges as qualified products.
Beneficial effects of the present invention are：
1, each link volumetric standard volume is demarcated, it is ensured that buffer container is arranged in the accuracy of subsequent experimental, 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
Time required for stabilization sub stage, 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, improves the automatic performance of entire detection process.
2, system selects high-precision pressure sensor using touch screen technology by using PLC controller, have compared with
Good detection accuracy and repeatability, and visual good, high degree of automation, can be used for the online batch detection of factory.
Detailed description of the invention
Present invention will be further explained below with reference to the attached 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 Control system architecture block diagram of the invention；
Fig. 3 is air-tightness detection device structural schematic diagram of the invention；
Fig. 4 is the main view of air-tightness detection device in the present invention；
Fig. 5 is the structural schematic diagram of detection device fixture in Fig. 3；
Fig. 6 is the partial enlarged view in Fig. 5 at A；
Fig. 7 is the cross-sectional view of flange link mechanism in Fig. 5；
Fig. 8 is the cross-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, acquisition unit and system pneumatic circuit, the system pneumatic circuit include：Electromagnetic valve component, compression
Gas 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 to realize 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 acquisition unit includes pressure sensor Pn, pressure sensor PmWith limit switch 37, the limit switch
37 are arranged in 1 bottom of compression cylinder, prevent 1 over-voltage of compression cylinder, are provided with pressure sensor P 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 negative
Blame the acquisition of pressure sensor data, pressure sensor PmFor detecting the blowing pressure size in buffer container, guarantee standard
Pressure in container 3 is able to satisfy 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 the platform floor setting
Table foot seat 6, the 7 upper-end front two 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, be located at platform floor (7) upper end, compression cylinder (1) be arranged 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 filtering pressure reducing valve 4 and precise pressure regulating valve are arranged in Pneumatic cabinet
2 outsides.
The control system, acquisition 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 detection 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 environment by PC machine with system performance testing and calibration
It is existing.
The power circuit includes single-phase 220V alternating current main power source and 24V Switching Power Supply, the main electricity of the alternating current
Source is connected with 24V Switching Power Supply by conducting wire, 24V Switching Power Supply 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 reinforce connecting rod 32, branch described in two pieces
Support 31 upper end of 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 pressure
Tight 1 lower end of cylinder is provided with cavity upper cover 35 by flange connection, this is because different model video camera products is airtight
Property detection, need to design different volumetric standards, when replacing different product volumetric standard, cavity upper cover is also required to replace, institute
With the cavity upper cover 35 connecting with the piston rod of compression cylinder 1 is designed to flange link mechanism and the non-dismountable knot of non-Unitary
Structure, the compression cylinder 1 are connected by throttle valve 36 with switch valve with two-position and five-pass, and compression cylinder 1 commutates in two-position five-way
Under the control of valve, the sealing and opening to volumetric standard 3 are realized.
As a kind of optimal technical scheme of the design, the piston rod and flanged joint bar 38 of 1 lower end of compression cylinder
Upper end closely-pitched internal thread hole is locked the two by spring block, the flanged joint by being threadedly engaged connection
38 bottom end of bar is spherical, and by using spherical surface auxiliary structure, the planar contact pair of relatively traditional face and face contact is designed, and advantage is
When volumetric standard 3 because cavity upper cover 35 is under the promotion of compression cylinder 1 when processing or installation reason lead to not severity
Minute angle can be rotated to guarantee the sealing of volumetric standard 3, while it is too big not will lead to 38 radial forces of flanged joint bar
And making piston rod deformation failure, 38 bottom of flanged joint bar is connected by connecting flange 34 with cavity upper cover 35, spherical
Backing plate, 34 inside of connecting flange and spherical flanged joint bar are provided between 38 bottom of flanged joint bar and cavity upper cover 35
The place of 38 contacts is cooperated using yielding rubber, plays certain buffer function in compressing loading process.
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
It is provided with O-ring seal, is tightly connected between upper container 25 and bottom container 26 by O-ring seal, cavity upper cover 35
It is sealed between upper container 25 by O-ring seal when decline, 26 two 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 PnBy being threadedly engaged connection, institute
Vent valve is provided on the air inlet 23 stated, 26 bottom of bottom container has been connected by screw to 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
Guarantee the sealing of volumetric standard 3.
It need to be to the volumetric standard 3 for the accuracy for ensuring 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 and coarse adjustment to compressed gas source gas 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, is realized control compression cylinder 1, is controlled the work of 1 lower end of compression cylinder
Stopper rod drives cavity upper cover 35 to decline, and realizes the sealing to volumetric standard 3, the limit switch of 1 bottom of compression cylinder is arranged in
37, prevent 1 over-voltage of compression cylinder；When carrying out air-leakage test using apparatus of the present invention, in automatic running operation, manually by work
Part is put in volumetric standard, and by both hands start button, cylinder declines automatically, and volumetric standard is blocked, starting detecting instrument into
-- balance -- test -- is deflated, and detection circulation is completed for row inflation.If workpiece sensing is qualified, qualified indicator light is bright, and cylinder is automatic
Rise to reset condition.If workpiece is unqualified, unqualified indicator light is bright, and cylinder is failure to actuate, the stopping of the box that needs to touch the button by
Button is resetted, and cylinder returns to reset condition, if it is desired to continuing to test to this unqualified workpiece, need to press both hands starting, instrument after 3 seconds
Device continues the detection of a circulation, and testing result has been stored in instrument.In manual operation operation, workpiece is manually put in mark
In quasi- container, automatic/automatic knob is rotated to " manual ", presses lifting cylinder button, volumetric standard is sealed in cylinder decline
It is stifled, press inflation instrument manually and start to inflate that -- balance -- test -- is deflated, detection circulation completion.If you need to stop halfway, elder generation is needed
By manual stop button, then lifting cylinder button is pressed, cylinder release is made to rise to reset condition.Products air tightness test is carried out,
Test process divided for four stages there are four stage, i.e. aeration phase, equilibrium stage, test leak detection stage and releasing phase
Analysis：
(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 will lead to gas and chamber wall generation frequent impact, so that shock oscillation is generated, this
When gas pressure and temperature can all be fluctuated, it is necessary to wait gaseous state stablize, by comparing inflate after pressure
Theoretical pressure value when not leaking with workpiece judges the whether big leakage of workpiece, if big leakage, is then immediately finished test.
(2) equilibrium stage：After completing to the inflation of volumetric standard 3, charge valve is closed.Because the switching of solenoid valve acts on meeting
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 gas shape
State just can enter test phase after restoring stable and be detected.
(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 is compared it can be concluded that final detection is result.
(4) releasing phase：After test phase, vent valve is opened and is deflated, the volumetric standard being sealed is opened simultaneously
3, terminate a test period.
In order to improve system detection 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 only illustrating for the description in above embodiments and description is of the 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, acquisition 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 the inlet end of filtering pressure regulator valve, institute
The outlet side for stating filtering pressure regulator valve is connected with the inlet end of the inlet end of precise pressure regulating valve, switch valve with two-position and five-pass respectively, 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 acquisition unit includes pressure sensor Pn, pressure sensor PmWith limit switch (37), the limit switch
(37) it is arranged in 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 two 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 set is in platform floor (7) upper surface, between Pneumatic cabinet (2) and start button (5), the volumetric standard (3)
Below detection device fixture, it is located at platform floor (7) upper end, compression cylinder (1) is arranged 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), filtering pressure reducing valve (4), essence
Close pressure regulator valve setting is on the outside of Pneumatic cabinet (2), and cpu controller, acquisition unit are arranged in electrical control cabinet (12), the electricity
The front panel of gas control cabinet (12) is disposed with status indicator lamp (11), manual operation knob (10) and industry touching from top to bottom
It touches screen (9), the graphic control panel (9) is 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 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 being threadedly engaged, and will by spring block
The two is locked, and flanged joint bar (38) bottom end is spherical, and flanged joint bar (38) bottom passes through connecting flange
(34) it is connected with cavity upper cover (35), is provided with pad between spherical flanged joint bar (38) bottom and cavity upper cover (35)
The place of plate, connecting flange (34) inside and spherical flanged joint bar (38) contact is cooperated 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
It (3) is 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 provided with O-ring seal in bottom container sealed groove (22), upper container (25) with
It is tightly connected between bottom container (26) by O-ring seal, is led between upper container (25) when cavity upper cover (35) declines
It crosses O-ring seal to be sealed, the bottom container (26) two sides are respectively arranged with pipe screw thread air inlet (23) and pipe screw thread
Pressure port (24), the pressure port (24) and pressure sensor PnIt is connected by being threadedly engaged, on the air inlet (23)
It is provided with vent valve, the bottom container (26) bottom has been connected by screw to 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820075315.6U CN208171536U (en) | 2018-01-17 | 2018-01-17 | A kind of external pressure direct pressure closing test device for air tightness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820075315.6U CN208171536U (en) | 2018-01-17 | 2018-01-17 | A kind of external pressure direct pressure closing test device for air tightness |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208171536U true CN208171536U (en) | 2018-11-30 |
Family
ID=64387283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820075315.6U Expired - Fee Related CN208171536U (en) | 2018-01-17 | 2018-01-17 | A kind of external pressure direct pressure closing test device for air tightness |
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| CN (1) | CN208171536U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900440A (en) * | 2019-03-26 | 2019-06-18 | 广西淞森车用部件有限公司 | A kind of ring flange and Tipping valve assembly leak detecting device and its detection method |
-
2018
- 2018-01-17 CN CN201820075315.6U patent/CN208171536U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900440A (en) * | 2019-03-26 | 2019-06-18 | 广西淞森车用部件有限公司 | A kind of ring flange and Tipping valve assembly leak detecting device and its detection method |
| CN109900440B (en) * | 2019-03-26 | 2023-12-05 | 广西淞森车用部件有限公司 | Device and method for detecting leakage of flange plate and rollover valve assembly |
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Granted publication date: 20181130 Termination date: 20200117 |