CN207335994U - Pressure-bearing end cap flange dynamic sealing performance detection device - Google Patents
Pressure-bearing end cap flange dynamic sealing performance detection device Download PDFInfo
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- CN207335994U CN207335994U CN201721164405.4U CN201721164405U CN207335994U CN 207335994 U CN207335994 U CN 207335994U CN 201721164405 U CN201721164405 U CN 201721164405U CN 207335994 U CN207335994 U CN 207335994U
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Abstract
The utility model belongs to shock dynamics technical field, and in particular to a kind of pressure-bearing end cap flange dynamic sealing performance detection device.Pressure-bearing end cap flange dynamic sealing performance detection device includes hydraulic cylinder, piston and end cap, hydraulic cylinder one end is installed by piston, the other end of hydraulic cylinder sets the flange for being used for installing end cap, and end cap is connected by bolt with flange, and sealing structure is set between end cap and flange；End cap is provided centrally with pressure sensor, and displacement sensor is provided between end cap and flange, and for being pasted with foil gauge on the bolt of connection end cap and flange vertically, the wire lead slot for drawing foil gauge conducting wire is additionally provided with end cap.The utility model produces impulse load by hydraulic method, being capable of overcoming quick-fried loading experiment preparatory period length, the problems such as priming system operational danger is high；The quick-fried experiment porch of also reducing establishes required cost at the same time.
Description
Technical field
The utility model belongs to shock dynamics technical field, and in particular to a kind of pressure-bearing end cap flange dynamic sealing performance
Detection device.
Background technology
End cap flange is the common structure on the bearing devices such as pressure vessel, conveying pipe, its primary structure generally includes
Flange, end cap, bolt and sealing material, ensure bearing device by the sealing material between bolt presses flange and end cap
Sealing safety.Usually, the service load of above-mentioned bearing device is static pressure or quasi-static pressure, and when design is also typically according to quiet
State pressure loading completes the design of flange sealing structure.But under specific condition, when explosion such as occurs or hitting, flange arrangement
Load-up condition will become dynamic impulse load, how to ensure the sealing safety of such dynamic pulse lower flange, be to hold
The major issue faced in pressure equipment design.
Detection for pressure-bearing end cap flange static sealing performance or examination technology comparative maturity, laboratory or factory
In, by using the sealing performance of helium mass spectrum leak detection method measure static pressure flange.Specific method is after completing flange assembling, by flange
One be placed in the higher environment of concentrations of helium, the concentrations of helium using helium mass spectrometer leak detector detection flange opposite side changes,
So as to calculate slip, the sealing performance of flange is characterized.By helium mass spectrum leak detection method control flange sealing performance, it is necessary to longer
Time (is usually not less than 20min), can just gas molecule is fully spread, provide accurate leak rate result.Therefore, helium mass spectrum
Leak detecting is monitored primarily directed to static or quasi-static pressure load lower structure sealing performance.But under dynamic load, end
The leakage of lid flange was frequently experienced in the millisecond even time of musec order, and loading wink can not be analyzed using helium mass spectrum leak detection method
Between end cap flange sealing effect.
Research and assessment mode currently for the dynamic sealing problem of end cap flange are limited to theory more, and by test into
Capable research and assessment mode is relatively fewer.In addition to the problem of in terms of the above-mentioned detection technique, experimental study and curriculum test means also face
Face the problem of certain.From the point of view of disclosed data, it is to investigate the common reality of pressure-bearing end cap flange dynamic sealing performance to change quick-fried loading
Proved recipe method, but this examination research method has obvious limitation in the following aspects：(1) developmentization is quick-fried in the lab
, it is necessary to buy, operate priming system, cost is higher, has higher danger for experiment；(2) identical explosion equivalent, quick-fried heart distance
Under the conditions of, the uniformity of blast load is poor, is not suitable for carrying out high-precision examination and Research on Regularity experiment；(3) passing through
Quick-fried mode carries out examination experiment, it is necessary to which explosive container or similar experiment porch ensure security, and the manufacture of these platforms carries
The high cost of examination and research.
Utility model content
The utility model aim is to provide a kind of pressure-bearing end cap flange dynamic sealing performance detection device, solves existing
Change existing for quick-fried experiment detection method the dangerous big, technical problem such as precision is low, cost is high.
The technical solution of the utility model is a kind of pressure-bearing end cap flange dynamic sealing performance detection device, its is special
Part is：Including hydraulic cylinder, piston and end cap, hydraulic cylinder one end installation piston, the other end of hydraulic cylinder, which is set, to be used to install
The flange of end cap, the end cap are connected by bolt with flange, and seal groove, sealing ring or gasket are provided between end cap and flange
Etc. sealing structure；
The piston includes the shock column axially set along hydraulic cylinder and the hydraulic disk radially set along hydraulic cylinder, described to hit
Hit column one end to be fixedly connected with hydraulic pressure disk center, the other end for hitting column is stretched out outside hydraulic cylinder；The hydraulic disk and hydraulic cylinder
Sidewall spacers coordinate, formed between hydraulic disk and end cap and be used to fill the chamber of hydraulic medium；
The end cap is provided centrally with pressure sensor, and displacement sensor is provided between end cap and flange, for even
Connect and be pasted with foil gauge on the bolt of end cap and flange vertically, be additionally provided with the end cap for drawing foil gauge conducting wire
Wire lead slot.
Further, guide pad, the outer wall of the guide pad are also equipped between the shock column and hydraulic cylinder of above-mentioned piston
Fitted closely with the side wall of hydraulic cylinder, the through hole for being provided centrally with passing through for hitting column of guide pad；Also set on the guide pad
It is equipped with one or more axially extending bore for supplying hydraulic medium to pass through.
Further, the fixing end of above-mentioned shock column and hydraulic disk is provided with chamfering, and the shock column is stretched out outside hydraulic cylinder
The end set in portion has tapered changeover portion.
Further, above-mentioned pressure-bearing end cap flange dynamic sealing performance detection device further includes the driving for driving piston
Device, the driving device include closed gas chamber and the transmitting tube connected with gas chamber, valve are provided between gas chamber and transmitting tube
Door；Inflating port is provided with the gas chamber, the collision block with transmitting inside pipe wall clearance fit is installed in the transmitting tube.
Further, the quality of above-mentioned collision block is less than or equal to the quality of piston, and the hardness of collision block is less than the hard of piston
Degree.
Further, it is provided with the chamber formed between the hydraulic disk of above-mentioned piston and the bottom surface of hydraulic cylinder along hydraulic cylinder
The filter band radially set, the filter band is the circular steel plate identical with hydraulic cylinder side wall diameter, is offered on filter band more
A through hole, all through holes are distributed on the same circumference concentric with filter band.
Further, the bottom surface of above-mentioned hydraulic cylinder is provided with filtering hole, and the pressure sensor is by filtering hole and hydraulic pressure
Hydraulic medium contact in cylinder.
The utility model also provides a kind of pressure-bearing end cap flange dynamic sealing performance detection method, it is characterized in that,
Comprise the following steps：
1) as above any pressure-bearing end cap flange dynamic sealing performance detection device is built；
2) collision block hits piston, piston is produced axial movement in hydraulic cylinder；
3) piston compression hydraulic medium, dynamic pressure load is produced using the volume compression effect of hydraulic medium；
4) pressure sensor collection dynamic load course, the gap of sealing surface becomes when displacement sensor gathers dynamic load
Change, the amount of tension of the bolt of foil gauge collection connection end cap and hydraulic cylinder flange.
Further, step 1) comprises the following steps：
1.1) pressure sensor and displacement sensor are installed on end cap to be detected, the interface of pressure sensor is carried out
Sealing；
1.2) sealing material is installed on the flange of hydraulic cylinder one end, is then fixed and connected using the bolt for being pasted with foil gauge
Connect the flange of end cap and hydraulic cylinder；
1.3) hydraulic medium is loaded into hydraulic cylinder；
1.4) piston is loaded in hydraulic cylinder, the hydraulic disk and hydraulic medium that make piston come into full contact with, and discharge excessive liquid
Press medium；
1.5) guide pad is loaded in hydraulic cylinder, the shock column of piston is stretched out in after passing through guide pad outside hydraulic cylinder simultaneously
Remove remaining hydraulic medium between piston and guide pad；
1.6) driving device is fixedly mounted in the offside of the shock column of piston.
Further, step 2) comprises the following steps：
2.1) valve is closed, gas-pressurized is filled into the gas chamber of driving device by inflating port；
2.2) inflating port is closed, opens valve, gas-pressurized drives collision block to accelerate movement in transmitting tube；
2.3) collision block departs from the shock column of shock piston after transmitting tube；
2.4) under the shock of collision block, piston produces axial movement in hydraulic cylinder.
The beneficial effects of the utility model are：
(1) the utility model produces impulse load by hydraulic method, can overcoming quick-fried loading experiment preparatory period length,
The problems such as priming system operational danger is high；The quick-fried experiment porch of also reducing establishes required cost at the same time.
(2) the utility model is by using the piston of " T-shaped " and heavy in section, the hydraulic cylinder structure of small length so that produces
Load pulsewidth reach 10~103μ s magnitudes, peak value reach 100MPa magnitudes, under certain condition, method described in the utility model
The impulse load of generation is similar to changing quick-fried Load Effects.
(3) the utility model is by the common measurement means such as strain, displacement, by analyzing impulse load lower sealing surface
Gap changes, and directly the dynamic sealing performance of end cap flange is examined, and test method is simple and efficient.Avoid helium mass spectrum
The helium mass spectrometer leak detector and substantial amounts of helium of the high cost used in leak hunting method, while it also avoid parcel helium cover, vacuumize
Deng complicated operation.
Brief description of the drawings
Fig. 1 is the preferred embodiment structural representation of the utility model pressure-bearing end cap flange dynamic sealing performance detection device
Figure.
Fig. 2 is wire lead slot position view.
Wherein, reference numeral is as follows：1- gas chambers, 2- valves, 3- transmitting tubes, 4- collision blocks, 5- pistons, 6- guide pads, 7- liquid
Cylinder pressure, 8- hydraulic mediums, 9- bolts, 10- end caps, 11- displacement sensors, 12- pressure sensors, 13- wire lead slots, 14- are hit
Column, 15- hydraulic disks.
Embodiment
Referring to Fig. 1, the utility model provides a kind of pressure-bearing end cap flange dynamic sealing performance detection device, it is preferably implemented
The structure of example mainly includes hydraulic cylinder 7, piston 5 and end cap 10,7 one end of hydraulic cylinder installation piston 5, and the other end of hydraulic cylinder 7 is set
The flange for installing end cap 10 is put, end cap 10 is connected by bolt 9 with flange seal, is additionally included for driving piston 5
Driving device.
Piston 5 includes the shock column 14 axially set along hydraulic cylinder 7 and the hydraulic disk 15 radially set along hydraulic cylinder 7, hits
Hit 14 one end of column to be fixedly connected with 15 center of hydraulic disk, the other end for hitting column 14 is stretched out outside hydraulic cylinder 7.Hydraulic disk 15 and liquid
The sidewall spacers of cylinder pressure 7 coordinate, and the chamber for being used for filling hydraulic medium 8 is formed between hydraulic disk 15 and the bottom surface of hydraulic cylinder 7.End
Lid 10 is provided centrally with pressure sensor 12, displacement sensor 11 is provided between end cap 10 and flange, for connection end cap
10 and flange bolt 9 on be pasted with foil gauge vertically.The lead for drawing foil gauge conducting wire is additionally provided with end cap 10
Groove 13, as shown in Fig. 2, wire lead slot 13 is located on the side of end cap 10, does not influence the sealed connection of end cap 10 and flange.
Guide pad 6, outer wall and the hydraulic cylinder 7 of guide pad 6 are also equipped between the shock column 14 and hydraulic cylinder 7 of piston 5
Side wall fits closely, the through hole for being provided centrally with passing through for hitting column 14 of guide pad 6；Be additionally provided with guide pad 6 one or
The multiple axially extending bores passed through for hydraulic medium of person.
The fixing end for hitting column 14 and hydraulic disk 15 is provided with chamfering, hits the end that column 14 is stretched out outside hydraulic cylinder 7 and sets
It is equipped with tapered changeover portion.
Load precision occurs to improve, the cooperation cylindrical surface on piston 5, guide pad 6 and hydraulic cylinder 7, which requires to grind to match somebody with somebody, to be made,
Its matching relationship is clearance fit.Guide pad 6 is fitted into hydraulic cylinder 7 by external screw thread, its main function includes two aspects：
(1) axial direction of the direction of motion of piston 5 after colliding along hydraulic cylinder 7 is ensured；(2) length of hydraulic medium 8 in hydraulic cylinder 7 is adjusted
x0。
To avoid hydraulic medium 8 from leaking, between guide pad 6 and hydraulic cylinder 7, the flange of end cap 10 and hydraulic cylinder 7 it
Between and end cap 10 and pressure sensor 12 between sealed using O-ring or metal gasket ring.To avoid hydraulic medium 8 from work
Plug 5 coordinates in the gap of cylinder with guide pad 6, hydraulic cylinder 7 to flow out, and the hydraulic medium 8 that viscosity is larger should be selected, such as castor oil.
Driving device is fixed on the offside for hitting column 14, and for driving collision block 4 to hit piston 5, hydraulic cylinder 7 can pass through machine
Tool structure is fixedly connected with driving device or is fixedly installed in the other structures of experiment porch, avoids hitting in collision block 4 and lives
When filling in 5, hydraulic cylinder 7 occurs rotating or displacement.
Driving device includes closed gas chamber 1 and the transmitting tube 3 connected with gas chamber 1, is set between gas chamber 1 and transmitting tube 3
There is valve 2, collision block 4 is installed in transmitting tube 3.It is using gas-pressurized driving collision block 4 that it, which is acted on, enables collision block 4 with 100~
101The speed impacts piston 5 of m/s magnitudes.
Gas chamber 1 is used for short time storage gas-pressurized, it is desirable to has preferable intensity and leakproofness.It is provided with gas chamber 1
Inflating port, according to the difference of required pressure, can select different airing forms, such as be inflated, using common using gas cylinder
Inflator inflation etc., closes inflating port after inflation.
The deflation of gas chamber 1 is controlled by valve 2.Deflation speed is faster, and the effect that collision block 4 accelerates is better；For ease of control
System, can be used the solenoid valve of folding speed.Furthermore, it desired to valve 2 has preferable leakproofness.
After valve 2 is opened, gas-pressurized rapidly enters transmitting tube 3, and drives collision block 4 to move.For ease of processing, can incite somebody to action
The registration interface designs of transmitting tube 3 and collision block 4 are cylindroid.To obtain comparatively ideal driving effect, the inner wall of transmitting tube 3 should try one's best
It is smooth, there is preferable straightness and cylindricity, and lubricating oil is applied in 3 inner wall of transmitting tube.To avoid transmitting tube 3 in Reusability
Inner wall damage, improve its service life, and the hardness of transmitting tube 3 can be improved by the method for modifier treatment.The length of transmitting tube 3 should
Moderate, length is too short, and that collision block 4 may be caused to accelerate is insufficient, and length is long may to cause collision block 4 to be opened when departing from transmitting tube 3
Begin to slow down.
Before transmitting, collision block 4 should be placed in the bottom of transmitting tube 3.To obtain preferable acceleration effect, by the outside diameter of collision block 4
Clearance fit relationship is arranged to the inner wall of transmitting tube 3, and fit clearance should not be too large.Excessive fit clearance may cause to add
Body of calming the anger leaks, it is also possible to causes to collide excessive, reduction drive efficiency between collision block 4 and transmitting tube 3 during driving.
The concrete operating principle of the present embodiment is as follows：
The quality of collision block 4 is denoted as M, speed when collision block 4 hits piston 5 is denoted as v0, the quality of piston 5 is denoted as m, then may be used
To establish the conservation of momentum and energy conservation equation of collision block 4 and 5 knockout process of piston：
Wherein, v1For the speed of the collision block 4 after collision, v2For the speed of the piston 5 after collision., can to above-mentioned equation solution
：
When the volume compression amount of hydraulic medium 8 is smaller, it is believed that the bulk modulus of hydraulic medium 8 is constant.Assuming that
The geometry of hydraulic medium 8 is that length is x0Cylinder, t moment hydraulic medium 8 by compression caused by length decrement be x
(t), k is the bulk modulus of hydraulic medium 8.The sectional area of cylindrical hydraulic medium 8 is denoted as S, compression process can be established
Governing equation is：
Obviously, the general solution of equation (3) is half-sine pulse, its pulsewidth and peak value are respectively：
Wherein T is load pulsewidth, PmaxFor load peaks.
From formula (2), when the quality of collision block 4 is equal to or less than the quality of piston 5, the speed of collision block 4 after collision
It is zero or is repelled, the process of follow-up 5 compression hydraulic medium 8 of piston will not be had an impact.Therefore, when device designs, Ying Bao
The quality for demonstrate,proving collision block 4 is not more than the quality of piston 5, so as to avoid collision block 4 that multiple collision occurs with piston 5, it is ensured that examination dress
The load for putting generation is individual pulse.In theory, when collision block 4 is equal with 5 mass of piston, the speed of collision block 4 is 0 after collision, its
Kinetic energy is completely converted into the kinetic energy of piston 5, energy transformation ratio highest.
According to formula (4), in order to reduce load pulsewidth T, the quality of piston 5 should be reduced, reduce the initial long of hydraulic medium 8
The sectional area of degree, increase hydraulic medium 8.In order to reach this design object, piston 5 is designed as " T-shaped " structure, and cutting greatly
Face and small bore transition position design larger chamfering, avoid stress concentration, improve the rigidity of structure.The impingement area of piston 5 and collision block 4
For ellipsoid, and there is tapered changeover portion, 5 end face big and heavy stone of piston is thick after avoiding multiple impacts, can not be taken out from guide pad 6.For
Improve the service life of piston 5, it is desirable to modifier treatment is carried out to piston 5, its hardness is more than collision block 4, reduction piston 5 is touching
Deformation damage in hitting.
According to formula (4), in order to improve load peaks in the case of ensuring that pulsewidth is less, can be carried by driving device
The emission rate v of high collision block 40, so as to improve the speed v of piston 5 after collision2。
In the specific course of work, hydraulic medium 8 should be filled in hydraulic cylinder 7 first, then by piston 5, guide pad 6
It is sequentially loaded into hydraulic cylinder 7.Assembling process should be operated slowly, and hydraulic medium 8 excessive in hydraulic cylinder 7 is slowly discharged, so that
Avoid being mixed into bubble in hydraulic medium 8 in assembling process.Discharge for the ease of excessive hydraulic medium 8, designed on guide pad 6
Some through holes.After assembling, extracted out using syringe from the through hole of guide pad 6 and remain in piston 5 and contacted with guide pad 6
Hydraulic medium 8 in plane, avoids these remaining hydraulic mediums 8 from forming extra hydraulic cavities between guide pad 6 and piston 5
Body, influences the normal work of detection device.
The flange arrangement for installing end cap 10 is devised on hydraulic cylinder 7, is to produce impulse load, test Load Effects
Platform.When it is implemented, hydraulic cylinder 7 should be fixed on experiment porch by certain mode, hydraulic cylinder 7 after hitting is avoided to occur
Displacement or rotation, influence experimental result.
The cooperation cylinder of piston 5, guide pad 6 and hydraulic cylinder 7 requires grinding with work, and machining tolerance meets that clearance fit will
Ask, ensure the pressure loading precision that checking device produces.
Use the flange and end cap 10 of 9 connection liquid cylinder pressure 7 of bolt.Under Dynamic Loading, the stretcher strain of bolt 9 is to examine
The important parameter of core flange seal performance, by straining the stretcher strain of built-in testing bolt 9 during examination.In order to ensure on bolt 9
With the space for pasting foil gauge, bolt 9 should not select screw bolt., should be first with sand paper polishing bolt 9 in specific implementation
On non-threaded cylinder, paste foil gauge along bolt 9 is axial after scrubbing, then load the bolt 9 for posting foil gauge
Bolt hole, the conducting wire on foil gauge draw bolt hole from wire lead slot 13.To ensure that the flange of hydraulic cylinder 7 and end cap 10 assemble
Even, using torque spanner pretension bolt 9, when pretension, pays attention to protecting the conducting wire on foil gauge and foil gauge., should after pretension
Become the electric measuring system that piece access is made of electric bridge, dynamic strain indicator etc., complete building for strain measurement system.
In order to be measured to the change of dynamic load lower sealing surface gap, displacement sensor 11 is devised on end cap 10
Mounting hole.In specific implementation, displacement sensor 11 is fixed on to the relative displacement that sealing surface is measured on end cap 10.As shown in Figure 1,
To prevent hydraulic medium 8 from influencing displacement measurement, the position of displacement measuring points should be between sealing structure and bolt 9.Good seal
In the case of, the change of the gap of the flange of hydraulic cylinder 7 and end cap 10 is usually 10~10 under dynamic load2μm magnitude, it is contemplated that
The requirement of sensitivity, frequency response etc., it is proposed that select optical fibre displacement sensor.
The center drilling installation pressure sensor 12 of end cap 10, the purpose of pressure test are to provide the research of flange dynamic response
Input load.Device is related to the processes such as collision, compression and structural response during working, and directly measuring pressure loading can
Can there are more interference signal.The basic principle that pressure loading is produced in view of checking device is to utilize the body of hydraulic medium 8
Product pinch effect, can add mechanical filter structure in hydraulic cylinder 7.
,, should be according to following after all structures scrub to avoid 8 leakage contribution of hydraulic medium from testing in specific implementation
The step of assemble：
(1) pressure sensor 12 is installed on end cap 10 and displacement sensor 11, the interface of wherein pressure sensor 12 is done
Good seal approach；
(2) sealing material is installed in the flange of hydraulic cylinder 7, the assembling of hydraulic cylinder 7, end cap 10 is completed, is pulled using torque
Hand pretension bolt 9；
(3) hydraulic medium 8 is filled it up with hydraulic cylinder 7；
(4) piston 5 is slowly loaded into hydraulic cylinder 7, discharges excessive hydraulic medium 8, be careful not to bubble and entered hydraulic pressure
Medium 8；
(5) guide pad 6 is slowly loaded into hydraulic cylinder 7, discharges excessive hydraulic medium 8, then pump work using syringe
Remaining hydraulic medium 8 between plug 5 and guide pad 6.
After the completion of assembling, driving device transmitting collision block 4 hits the piston 5 on hydraulic cylinder 7, produces 10~103μ s magnitudes, peak
Value reaches the impulse load of 100MPa magnitudes, and the gap that sealing surface is tested by strain measurement system and displacement test system becomes
Change, examine the dynamic sealing performance of end cap flange.
The method that state sealing performance detection is carried out based on the present embodiment pressure-bearing end cap flange dynamic sealing performance detection device
Comprise the following steps：
1) pressure-bearing end cap flange dynamic sealing performance detection device is built；
2) collision block 4 hits piston 5, piston 5 is produced axial movement in hydraulic cylinder 7；
3) 5 compression hydraulic medium 8 of piston, dynamic pressure load is produced using the volume compression effect of hydraulic medium 8；
4) pressure sensor 12 gathers dynamic load course, and the gap of sealing surface becomes when displacement sensor gathers dynamic load
Change, the amount of tension of the bolt 9 of foil gauge collection 7 flange of connection end cap 10 and hydraulic cylinder.
It is preferred that step 1) comprises the following steps：
1.1) pressure sensor 12 and displacement sensor 11 are installed on end cap 10 to be detected, pressure sensor is connect
Mouth is sealed；
1.2) sealing material is installed on the flange of 7 one end of hydraulic cylinder, is then fixed using the bolt 9 for being pasted with foil gauge
The flange of connection end cap 10 and hydraulic cylinder 7；
1.3) hydraulic medium 8 is loaded into hydraulic cylinder 7；
1.4) piston 5 is loaded in hydraulic cylinder 7, the hydraulic disk and hydraulic medium for making piston 5 come into full contact with, and discharge excessive
Hydraulic medium；
1.5) guide pad 6 is loaded in hydraulic cylinder 7, the shock column 14 of piston 5 is stretched out in hydraulic cylinder after passing through guide pad 6
7 outsides simultaneously remove remaining hydraulic medium 8 between piston 5 and guide pad 6；
1.4) driving device is fixedly mounted in the offside of the shock column 14 of piston 5.
It is preferred that step 2) comprises the following steps：
2.1) valve 2 is closed, gas-pressurized is filled into the gas chamber 1 of driving device by inflating port；
2.2) inflating port is closed, opens valve 2, gas-pressurized drives collision block 4 to accelerate movement in transmitting tube 3；
2.3) collision block 4 departs from the shock column 14 of shock piston 5 after transmitting tube 3；
2.4) under the shock of collision block 4, piston 5 produces axial movement in hydraulic cylinder 7.
Compared with existing detection device and detection method, the present embodiment pressure-bearing end cap flange dynamic sealing performance detection dress
The advantage put is embodied in following three aspects：
First, in the similar work carried out, by the sealing performance for changing quick-fried loading examination end cap flange.This practicality
The new shock dynamics experiment porch common using laboratory, by hydraulic method produce impulse load, can overcoming it is quick-fried
The problems such as loading experiment preparatory period is long, priming system operational danger is high；Needed for the quick-fried experiment porch of also reducing is established at the same time
Cost.
Second, in common hydraulic load generating means, usually using prismatic cylinder-piston and hydraulic cylinder, generation
Load peaks are smaller, pulsewidth is longer.The utility model designs to produce pulsewidth, the peak value impulse load similar to changing quick-fried load
The piston and heavy in section, the hydraulic cylinder structure of small length of " T-shaped " so that the load pulsewidth of generation reaches 10~103μ s magnitudes,
Peak value reaches 100MPa magnitudes.
3rd, in common static sealing structural behaviour examination, often using the method for helium mass spectrum leak detection, it is necessary to be wrapped
The complicated operation such as wrap up in helium cover, vacuumize, it is also necessary to the higher helium mass spectrometer leak detector of cost and substantial amounts of helium.The utility model
Then by the common measurement means such as strain, displacement, changed by the gap for analyzing impulse load lower sealing surface, directly to end cap
The dynamic sealing performance of flange is examined.
Claims (7)
- A kind of 1. pressure-bearing end cap flange dynamic sealing performance detection device, it is characterised in that：Including hydraulic cylinder, piston and end cap, Piston is installed in hydraulic cylinder one end, and the other end of hydraulic cylinder sets the flange for being used for installing end cap, and the end cap passes through bolt and method Orchid is connected, and sealing structure is set between the end cap and flange；The piston includes hitting column and the hydraulic disk radially set along hydraulic cylinder, the shock column along what hydraulic cylinder was axially set One end is fixedly connected with hydraulic pressure disk center, and the other end for hitting column is stretched out outside hydraulic cylinder；The side of the hydraulic disk and hydraulic cylinder Wall clearance fit, forms the chamber for being used for filling hydraulic medium between hydraulic disk and end cap；The end cap is provided centrally with pressure sensor, displacement sensor is provided between end cap and flange, for connecting pin Foil gauge is pasted with vertically on the bolt of lid and flange, and the lead for drawing foil gauge conducting wire is additionally provided with the end cap Groove.
- 2. pressure-bearing end cap flange dynamic sealing performance detection device according to claim 1, it is characterised in that：The piston Shock column and hydraulic cylinder between be also equipped with guide pad, the outer wall of the guide pad and the side wall of hydraulic cylinder are fitted closely, led To the through hole for being provided centrally with passing through for hitting column of block；One or more is additionally provided with the guide pad and supplies hydraulic medium The axially extending bore passed through.
- 3. pressure-bearing end cap flange dynamic sealing performance detection device according to claim 1, it is characterised in that：The shock The fixing end of column and hydraulic disk is provided with chamfering, and the end set hit outside column stretching hydraulic cylinder has tapered transition Section.
- 4. pressure-bearing end cap flange dynamic sealing performance detection device according to claim 1, it is characterised in that：Further include use In the driving device of driving piston, the driving device includes closed gas chamber and the transmitting tube connected with gas chamber, gas chamber and hair Penetrate between pipe and be provided with valve；Inflating port is provided with the gas chamber, installs in the transmitting tube and matches somebody with somebody with transmitting inside pipe wall gap The collision block of conjunction.
- 5. pressure-bearing end cap flange dynamic sealing performance detection device according to claim 4, it is characterised in that：The collision block Quality be less than or equal to the quality of piston, the hardness of collision block is less than the hardness of piston.
- 6. according to any pressure-bearing end cap flange dynamic sealing performance detection device in claim 1-5, it is characterised in that： The filter band radially set along hydraulic cylinder is installed in the chamber formed between the hydraulic disk of the piston and the bottom surface of hydraulic cylinder, The filter band is the circular steel plate identical with hydraulic cylinder side wall diameter, and multiple through holes, all through holes are offered on filter band It is distributed on the same circumference concentric with filter band.
- 7. pressure-bearing end cap flange dynamic sealing performance detection device according to claim 6, it is characterised in that：The hydraulic pressure The bottom surface of cylinder is provided with filtering hole, and the pressure sensor is contacted by filtering hole with the hydraulic medium in hydraulic cylinder.
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| CN201721164405.4U CN207335994U (en) | 2017-09-12 | 2017-09-12 | Pressure-bearing end cap flange dynamic sealing performance detection device |
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| CN201721164405.4U CN207335994U (en) | 2017-09-12 | 2017-09-12 | Pressure-bearing end cap flange dynamic sealing performance detection device |
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| CN107462375A (en) * | 2017-09-12 | 2017-12-12 | 西北核技术研究所 | Pressure-bearing end cap flange dynamic sealing performance detection means and detection method |
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| CN118050135B (en) * | 2024-04-12 | 2024-06-07 | 惠生清洁能源科技集团股份有限公司 | LNG pipeline flange leak protection performance detection device |
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| CN107462375A (en) * | 2017-09-12 | 2017-12-12 | 西北核技术研究所 | Pressure-bearing end cap flange dynamic sealing performance detection means and detection method |
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| CN112635214A (en) * | 2020-12-14 | 2021-04-09 | 西安交通大学 | Device and method for protecting deformation of top cover of converter transformer on-load voltage regulation switch |
| CN112635214B (en) * | 2020-12-14 | 2022-05-20 | 西安交通大学 | Converter transformer on-load voltage regulation switch top cover deformation protection device and method |
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