CN106644537A - External pressure fatigue test device for shell structure with built-in energy storage device - Google Patents
External pressure fatigue test device for shell structure with built-in energy storage device Download PDFInfo
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- CN106644537A CN106644537A CN201610836249.5A CN201610836249A CN106644537A CN 106644537 A CN106644537 A CN 106644537A CN 201610836249 A CN201610836249 A CN 201610836249A CN 106644537 A CN106644537 A CN 106644537A
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- pressure
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- accumulator
- measuring cylinder
- pipeline
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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
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
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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
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides an external pressure fatigue test device for a shell structure with a built-in energy storage device. The test device comprises a pressure cylinder and a shell test piece arranged inside the pressure cylinder. The pressure cylinder and the shell test piece are provided with pressurization and pressure-relief systems. At least one energy storage device with a pre-charging internal pressure is arranged inside the shell test piece fixedly. When two or more than two energy storage devices are arranged, each two of the energy storage devices are connected in series to form an energy storage device group. Automatic controlling of cyclic loading and unloading is realized by a computer control unit, a pressure transmitter, a solenoid valve group, an electromagnetic valve group, and a pipeline; and a pressure storage cylinder is used for replacing a pressure pump and serves as a pressure source. According to a pressure transmitter value and system parameter setting, two electromagnetic valves are used for carrying out pressurization and pressure relief fine tuning on the pressure cylinder, so that a stable external environment can be provided for the shell test piece in the cylinder; and the other two electromagnetic valves are used for carrying out fatigue pressurization and pressure releasing on the inner cavity of the shell test piece based on a test program. Therefore, the external pressure fatigue test speed of a shell structure, especially a large shell structure can increase; and the pressurization and pressure releasing losses can be reduced.
Description
Technical field
The present invention relates to the external pressure fatigue test technology field of pressure hull structure, and in particular to by shell structure
The quickening fatigue test speed of the built-in accumulator with precompressed or accumulator group, the external pressure fatigue for reducing the shell structure being lost
Experimental rig.
Background technology
The external pressure fatigue test of pressure hull structure is difficult more than its internal pressure fatigue test, and external pressure fatigue test must be by pressure
The testing equipments such as power cylinder are general to keep cylinder pressure constant to avoid the pressure cylinder device fatigue of itself providing external pressure environment,
The lifting of control shell structure internal pressure adds unloading test to simulate external pressure fatigue.Due to high-pressure pump, the pressure of pipeline, flow performance
Lifting is limited, and with the maximization of housing test specimen, external pressure fatigue test frequency is low, slow-footed problem becomes increasingly conspicuous, and compels to be essential
Take technical measures, improve plus unloading efficiency, shorten the time, and the extension device life-span, increase economic efficiency.
The content of the invention
The applicant is improved for disadvantages mentioned above of the prior art, there is provided a kind of knot of the housing with built-in accumulator
Structure external pressure fatigue experimental device, it can accelerate the external pressure fatigue test speed of shell structure especially Large Shell Structure, and
Reduce plus release loss.
Technical scheme is as follows：
Shell Structures Under External Pressure fatigue experimental device with built-in accumulator, including pressure measuring cylinder and its interior housing test specimen, pressure
Power cylinder is respectively equipped with plus depressurized system with housing test specimen, and at least one accumulation of energy with preliminary filling internal pressure is installed with housing test specimen
Device.
Its further technical scheme is：
When the quantity of the accumulator is two or more, all accumulators are by being connected in series to form two-by-two accumulation of energy
Device group, is connected between two connected accumulators by the first high pressure rubber hose.
In the accumulator at the accumulator group head and the tail two ends, an accumulator is provided with the first pressurization mouth, another accumulation of energy
Device is provided with the first installing port, is respectively connected with first stop valve on the first pressurization mouth and the first installing port, two first section
Plug is only connected with valve.
The housing test specimen is provided with two the second installing ports, and pressure measuring cylinder is provided with three the second installing ports, housing test specimen
Two the second installing ports seal the first watertight connector being connected with middle through-hole, the first watertight connector is by wherein
Portion's through hole by housing test specimen inside with housing test specimen ft connection；Three the second installing ports of pressure measuring cylinder are sealed and are connected with band
Second watertight connector of portion's through hole；In three the second watertight connectors and two the first watertight connectors, two the second watertights
One end of connector connects respectively a first watertight connector, and the second watertight connector and corresponding first watertight connector
Between connected by the first steel bellow, and the other end of two the second watertight connectors is soft with the second high pressure rubber respectively
Pipe, the connection of first pressure transmitter, the second high pressure rubber hose, first pressure transmitter are respectively positioned on outside pressure measuring cylinder；3rd
Second watertight connector passes through its middle through-hole by pressure measuring cylinder inside and pressure measuring cylinder ft connection, the 3rd the second watertight connector
External pipeline be provided with second pressure transmitter.
Second installing port includes the through hole arranged on housing test specimen wall or on pressure measuring cylinder barrel, the axle of the through hole
The first tube coupling with middle through-hole is connected with upwards, the first tube coupling is connected with the through hole, the middle through-hole of the first tube coupling is platform
Running through in rank hole, the tube coupling on housing test specimen has the first watertight connector, and running through in the tube coupling on pressure measuring cylinder has the second watertight to connect
Fitting, the first watertight connector, the second watertight connector carry male part, and male part one end is supported with the shaft shoulder of the stepped hole
Seal is connect and be provided with therebetween, is held out against by nut on the other end of male part, nut is by its external screw thread and the step
The internal thread connection in hole.
Second high pressure rubber hose is connected by tee pipe fitting with the first pipeline, the first discharge pipe line, the first pipeline
It is connected with storage pressure cylinder outlet, and the first pipeline is provided with the first magnetic valve, the first discharge pipe line is provided with the second magnetic valve；Storage pressure
Cylinder outlet is connected with the second pipeline, and the second pipeline is connected by tee pipe fitting with the 3rd pipeline, the second discharge pipe line, the 3rd pipeline
It is connected with the second pressurization mouth of pressure measuring cylinder, the second pipeline is provided with the 3rd magnetic valve, and the second discharge pipe line is provided with the 4th electromagnetism
Valve；Storage pressure cylinder import is connected with the outlet conduit of force (forcing) pump, and storage pressure cylinder is provided with the 3rd pressure transmitter.
The first pressure transmitter, second pressure transmitter, the 3rd pressure transmitter, the first magnetic valve, the second electromagnetism
Valve, the 3rd magnetic valve, the 4th magnetic valve are connected by controlling cable with computer control unit, and computer control unit passes through
Controlling cable is connected with the frequency converter of force (forcing) pump.
Pacify on two the second watertight connectors being connected with first pressure transmitter, second pressure transmitter respectively
Equipped with manual exhaust pressure-relief valve；Second pressurization mouth of the pressure measuring cylinder and the second watertight connection of first pressure transmitter connection
Safety valve is mounted on part；The second stop valve is equipped with first pipeline, the second pipeline.
The two ends of the housing test specimen are welded to connect respectively with upper cover, low head, and low head is supported on inside pressure measuring cylinder
Base on；The upper end open of pressure measuring cylinder, the upper end open is covered with cover, and cover is with the connection end of pressure measuring cylinder cylinder
Flanged ends, described two flanged ends are carried out circumferential affixed by snap ring, are provided between described two flanged ends
Sealing ring.
The snap ring includes at least two sections snap ring sections being evenly distributed, the upper side plane of the flanged ends of cover, pressure
The underside plan of the flanged ends of power cylinder cylinder upper end open is with the inclined plane abutted with snap ring section cooperation；Each institute
State snap ring section bottom and be provided with roller, be equipped with track for roller on the ground.
The technique effect of the present invention：
1st, the accumulator or accumulator group by being placed with preliminary filling internal pressure inside housing test specimen of the invention, built-in accumulator
(group) has been reduced significantly housing test specimen internal capacity, make in test participate in plus, the volume of the water of stress-relief process greatly reduce, can add
The external pressure fatigue test speed of fast shell structure especially Large Shell Structure, while reducing the power output of force (forcing) pump and whole
The working loss of external pressure fatigue experimental device, extension device life-span.
2nd, built-in accumulator group (group) adopts tandem arrangement, and pressurising is convenient, no matter and accumulator quantity, only
Need that one hand stop valve is respectively installed at the head and the tail two ends of the accumulator group, and using screw plug and the stop valve closed
Dual-seal protection is formed, can effectively prevent accumulator internal pressure from leaking.
3rd, add depressurized system for housing test specimen, steel bellow is set and is used for connecting break-through housing test specimen and break-through pressure
Two watertight connectors of power cylinder cover, using steel bellow realize pressure measuring cylinder cylinder inner housing test specimen and pressure measuring cylinder cover it
Between flexible connection, solve the dislocation of watertight connector in two ends in prior art and misalign the skill difficult with the release of external pressure bottom hose
Art problem, can keep reliable pressure-resistant seal performance in fatigue plus stress-relief process.
4th, the pressure source of pressure measuring cylinder and housing test specimen replaces force (forcing) pump direct weighting using storage pressure cylinder, can make loading procedure more
Steadily, it is easier to carry out pressure vernier control.
5th, pressure measuring cylinder and housing test specimen are respectively provided with manual exhaust pressure-relief valve, can at any time exclude in pipeline in process of the test
Air, manual release also can be carried out under the emergency cases such as power-off；Safety is respectively arranged with pressure measuring cylinder, housing test specimen and storage pressure cylinder
Valve, can automatically release in superpressure, it is ensured that safety.
Description of the drawings
Fig. 1 is the structural representation of the present invention, and in figure, double dot dash line is controlling cable.
Fig. 2 is the structural representation of the accumulator group, and the knot of the pressue device of the accumulator group is also show in figure
Structure.
Fig. 3 is A portions enlarged drawing in Fig. 1.
Fig. 4 is B portions enlarged drawing in Fig. 3.
Fig. 5 is the top view of the assembling structure of pressure measuring cylinder and cover in Fig. 1.
Wherein：1st, pressure measuring cylinder；101st, cover；102nd, the second pressurization mouth；2nd, housing test specimen；3rd, accumulator；301st, first adds
Pressure mouth；302nd, the first installing port；4th, the first high pressure rubber hose；5th, the first stop valve；6th, plug；7th, the second installing port；8th,
One watertight connector；801st, male part；9th, the second watertight connector；10th, the first steel bellow；11st, the second high pressure rubber is soft
Pipe；12nd, first pressure transmitter；13rd, track；14th, second pressure transmitter；15th, tube coupling；16th, seal；17th, nut；18、
First pipeline；19th, the first discharge pipe line；20th, pressure cylinder is stored up；21st, the first magnetic valve；22nd, the second magnetic valve；23rd, the second pipeline；
24th, the 3rd pipeline；25th, the second discharge pipe line；26th, the 3rd magnetic valve；27th, the 4th magnetic valve；28th, force (forcing) pump；29th, the 3rd pressure
Transmitter；30th, computer control unit；31st, frequency converter；32nd, manual exhaust pressure-relief valve；33rd, safety valve；34th, the second stop valve；
35th, upper cover；36th, low head；37th, base；38th, snap ring；39th, sealing ring；40th, roller；41st, pressure pipeline；42nd, intermediate cylinder；
43rd, booster pump；44th, pressure gauge；45th, the 3rd stop valve；46th, supporting leg；47th, air compressor；48th, air supply hose.
Specific embodiment
Below in conjunction with the accompanying drawings, the specific embodiment of the present invention is illustrated.
See Fig. 1, Fig. 2, the Shell Structures Under External Pressure fatigue experimental device with built-in accumulator of the present invention includes pressure measuring cylinder 1
And the housing test specimen 2 being placed on inside pressure measuring cylinder 1, pressure measuring cylinder 1 and housing test specimen 2 be respectively equipped with plus depressurized system, housing test specimen 2
Inside it is installed with least one accumulator 3 with preliminary filling internal pressure.
When the quantity of the accumulator 3 is two or more, all accumulators 3 are by being connected in series to form two-by-two storage
Energy device group, is connected between two connected accumulators 3 by the first high pressure rubber hose 4；The accumulator group head and the tail two ends
In accumulator 3, an accumulator 3 is provided with the first pressurization mouth 301, and another accumulator 3 is provided with the first installing port 302, the
First stop valve 5 is respectively connected with the one pressurization installing port 302 of mouth 301 and first, is connected with two the first stop valves 5
Plug 6, the accumulator group for being pre-charged with internal pressure by plug 6 and the first stop valve 5 pairs closed forms dual-seal protection,
The internal pressure for preventing the accumulator group leaks.
In specific configuration, Fig. 1, Fig. 5 are seen, the two ends of the housing test specimen 2 connect respectively with upper cover 35, the welding of low head 36
Connect, low head 36 is supported on the fixed base 37 in the inside of pressure measuring cylinder 1, and accumulator 3 is fixed by supporting leg 46 and supports low head 36
On；The upper end open of pressure measuring cylinder 1, the upper end open is covered with cover 101, and cover 101 is equal with the connection end of the cylinder of pressure measuring cylinder 1
For flanged ends, the flanged ends of the cylinder of pressure measuring cylinder 1 and the flanged ends of cover 1021 carry out circumference by snap ring 38
It is affixed, it is provided with sealing ring 39 between two flanged ends；Snap ring 38 includes at least two sections snap ring sections being evenly distributed,
The upper side plane of the flanged ends of cover 101, the underside plan of the flanged ends of the cylinder upper end open of pressure measuring cylinder 1 carry with
The snap ring section coordinates the inclined plane for abutting, and the angle between the inclined plane and horizontal plane is preferably within 2.5 °；Each institute
State snap ring section bottom and be provided with roller 40, be equipped with track 13 for roller 40 on the ground, be easy to pressure measuring cylinder especially large-scale pressure
The assembly and disassembly of power cylinder.
The housing test specimen 2 is provided with two the second installing ports 7, and the second installing port 7 on housing test specimen 2 is preferably provided at
On upper cover 35, pressure measuring cylinder 1 is provided with three the second installing ports 7, and the second installing port 7 on pressure measuring cylinder 1 is preferably provided at cover
On 101, two the second installing ports 7 of housing test specimen 2 seal the first watertight connector 8 being connected with middle through-hole, and first
Watertight connector 8 passes through its middle through-hole by the inside of housing test specimen 2 and the ft connection of housing test specimen 2；Three second of pressure measuring cylinder 1
Installing port 7 seals the second watertight connector 9 being connected with middle through-hole；Three the second watertight connectors 9 and two first
In watertight connector 8, one end of two the second watertight connectors 9 connects respectively a first watertight connector 8, and the second watertight
Connect and communicate by steel bellow 10 between connector 9 and corresponding first watertight connector 8, steel bellow 10 is located at
In pressure measuring cylinder 1, the other end of two the second watertight connectors 9 respectively with the second high pressure rubber hose 11, first pressure transmitter
12 connections, the second high pressure rubber hose 11, first pressure transmitter 12 are respectively positioned on outside pressure measuring cylinder 1, first pressure transmitter 12
It is located on the external pipeline of the second watertight connector 9；3rd the second watertight connector 9 passes through its middle through-hole by pressure measuring cylinder 1
The internal and ft connection of pressure measuring cylinder 1, the external pipeline of the 3rd the second watertight connector 9 is provided with second pressure transmitter 14.
Specifically, Fig. 3, Fig. 4 are seen, second installing port 7 includes being set on the wall of housing test specimen 2 or on the barrel of pressure measuring cylinder 1
The through hole put, is connected with the tube coupling 15 with middle through-hole in the axial direction of the through hole, tube coupling 15 is connected with the through hole, tube coupling 15
Middle through-hole be stepped hole, through having the first watertight connector 8, the tube coupling on pressure measuring cylinder 1 in the tube coupling 15 on housing test specimen 2
Through there is the second watertight connector 9 in 15, the first watertight connector 8, the second watertight connector 9 carry male part 801, evagination
The one end of portion 801 abuts and is provided with therebetween seal 16 with the shaft shoulder of the stepped hole, by spiral shell on the other end of male part 801
Cap 17 holds out against, and nut 17 is connected by its external screw thread with the internal thread of the stepped hole, the preferred tetrafluoroethene packing ring of seal 16,
By the setting of the special construction to the second installing port 7, be achieved in the first watertight connector 8, the second watertight connector 9 with it is right
The sealing of the second installing port 7 answered is affixed.
Second high pressure rubber hose 11 is by tee pipe fitting (being simplified in figure) and the first pipeline 18, the first drainpipe
Road 19 connects, and the first pipeline 18 is connected with the storage outlet of pressure cylinder 20, and the first pipeline 18 is provided with the first magnetic valve 21, the first draining
Pipeline 19 is provided with the second magnetic valve 22；The storage outlet of pressure cylinder 20 is connected with the second pipeline 23, and the second pipeline 23 passes through tee pipe fitting
(being simplified in figure) is connected with the 3rd pipeline 24, the second discharge pipe line 25, the second pressurization mouth of the 3rd pipeline 24 and pressure measuring cylinder 1
102 connections, the second pipeline 23 is provided with the 3rd magnetic valve 26, and the second discharge pipe line 25 is provided with the 4th magnetic valve 27；Storage pressure cylinder
20 imports are connected with the outlet conduit of force (forcing) pump 28, and storage pressure cylinder 20 is provided with the 3rd pressure transmitter 29.By to pressure measuring cylinder 1,
The special setting of housing test specimen 2 plus depressurized system structure, that is, be provided with middle storage pressure cylinder 20 and solenoid valve block so that plus
Release is more steady, it is easy to carry out pressure fine setting.First magnetic valve 21, the second magnetic valve 22 are respectively used to the inner chamber of housing test specimen 2
Pressurization, the independent control of release, the 3rd magnetic valve 26, the 4th magnetic valve 27 be respectively used to the inner chamber of pressure measuring cylinder 1 pressurization, release it is only
Vertical control.
Further for realizing plus release is automatically controlled, the first pressure transmitter 12, second pressure transmitter 14,
3rd pressure transmitter 29, the first magnetic valve 21, the second magnetic valve 22, the 3rd magnetic valve 26, the 4th magnetic valve 27 are by control
Cable processed is connected with computer control unit 30, and computer control unit 30 is by controlling cable and the frequency converter 31 of force (forcing) pump 28
Connection.First pressure transmitter 12, second pressure transmitter 14, the 3rd pressure transmitter 29 are respectively by housing test specimen 2, pressure measuring cylinder
1st, the real-time pressure value for storing up pressure cylinder 20 transmits the pressure for passing through storage pressure cylinder 20 to computer control unit 30, computer control unit 30
Power, to frequency converter 31 frequency signal of change is sent, and is controlled the startup of force (forcing) pump 28 and is closed by frequency converter 31.Four electromagnetism
Valve Jing control cables are connected with computer control unit 30, the reality that computer control unit 30 is transmitted according to three pressure transmitters
When pressure value and computer control unit 30 in set pressure range parameter, control four magnetic valves keying and flow
Size, to realize automatically adjusting for pressure measuring cylinder 1 and the internal pressure of housing test specimen 2, four magnetic valves are supplied soft by the Jing of air compressor 47
Pipe 48 provides lasting switching power.Can also lead in first pressure transmitter 12, the installation pipeline of second pressure transmitter 14
Cross branch joint and be respectively mounted a pressure gauge 44, be respectively used to observe the housing test specimen 2, internal pressure of pressure measuring cylinder 1.
In order to ensure that external pressure test is safe and reliable, it is connected with first pressure transmitter 12, second pressure transmitter 14 respectively
Two the second watertight connectors 9 on be mounted on manual exhaust pressure-relief valve 32, can in process of the test discharge pipe at any time
Air in road, also can carry out manual release under the emergency cases such as power-off；Second pressurization mouth 102 and first of pressure measuring cylinder 1 is pressed
Second watertight connector 9 of the connection of power transmitter 12, it is mounted on safety valve 33 in the installation pipeline of the 3rd pressure transmitter 29,
Can in superpressure automatically unloading；The second stop valve 34 is equipped with first pipeline 18, the second pipeline 23, or, the second pipeline 23,
First pipeline 18 can be connected by tee pipe fitting with a main pipe rail, and the main pipe rail is connected with the outlet of storage pressure cylinder 20, and
Second stop valve 34 is set on the main pipe rail.
The present invention is needed to the accumulator group preliminary filling internal pressure before external pressure fatigue test is carried out to housing test specimen 2, sees figure
2, two plugs 6 of dismantling are installed after the first stop valve 5 on the first pressurization mouth 301, and the other end of the first stop valve 5 passes through forcing pipe
Road 41 is connected with the outlet of intermediate cylinder 42, and the import of intermediate cylinder 42 is connected with the outlet conduit of booster pump 43, first on accumulator 3
Installing port 302 first installs one pressure gauge 44 of installation after the first stop valve 5, and the 3rd stop valve 45 is installed on pressure pipeline 41, right
When the accumulator group is pressurizeed, two the first stop valves 5 are opened, start booster pump 43, it is slow to open the 3rd stop valve 45,
The accumulator group is pressurizeed, the pressure gauge 44 observed on the accumulator 3 of the accumulator group afterbody is pressed when setting is reached
During force value, close the 3rd stop valve 45 and stop pressurization, be then shut off two the first stop valves 5, remove pressure gauge 44, pressure pipeline
41, and a plug 6 is respectively and fixedly connected with two one end of two stop valves 5, thus to being pre-charged with the accumulator of certain internal pressure
Group is sealed, and prevents its internal pressure from leaking, and the accumulator group for being pre-charged with internal pressure is positioned in housing test specimen 2, and is passed through
Supporting leg 46 is welded on low head 36.To reduce number of devices, experimentation cost is saved, booster pump 43 and force (forcing) pump 28 can be used
Same pump, and preferably high-pressure plunger pump, intermediate cylinder 42 can use same cylinder with storage pressure cylinder 20.
After the external pressure fatigue experimental device assembling terminates, Fig. 1 is seen, external pressure fatigue test procedure declaration of the present invention is such as
Under：
Water is filled inside pressure measuring cylinder 1 and housing test specimen 2, two manual exhaust valves 32 are closed, storage pressure cylinder 20 is opened and is exported
The second stop valve 34 arranged on pipeline, arranges the initial parameter of fatigue test (including housing on computer control unit 30
The internal pressure lower limit P of test specimen 20(to avoid release tip speed excessively slow, P0Should be greater than 0MPa) and upper limit P1, pressure measuring cylinder:1 it is constant
Internal pressure P2And its range of pressure fluctuations ± Δ P, store up the internal pressure lower limit P of pressure cylinder 204With upper limit P5), three pressure transmitters 12/14/
29 coefficient, should additionally arrange scale factor, the fatigue and cyclic of the time, control plus release speed of pressurization, release and voltage stabilizing
Number of times etc..The inside and outside differential pressure of housing test specimen 2 is calculated according to setup parameter, i.e., the external pressure that housing test specimen 2 actually bears is P2-P0(on
Limit value) and P2-P1(lower limit).
The inlet valve of force (forcing) pump 28 is opened, is started air compressor 47 and is started to accumulate air pressure, in computer control unit
Start frequency converter 31 on 30, because the initial pressure of the 3rd pressure transmitter 29 is 0, computer control unit 30 is to 31, frequency converter
Go out frequency signal, be allowed to drive force (forcing) pump 28 to start running, Jing pressure pipelines inject pressure into storage pressure cylinder 1, until storage pressure cylinder
Internal pressure upper limit P of 20 settings5Stop the pressurization of storage pressure cylinder 20 afterwards.Storage pressure cylinder 20 after pressurization is used as whole external pressure fatigue test
Pressure source, storing up the internal pressure of pressure cylinder 20 will constantly reduce in the consumption for adding unloading, less than the internal pressure lower limit P that it sets4When, calculate
Machine control unit 30 is again started up 31 degree of storage pressure cylinders 20 of frequency converter and carries out ftercompction according to the value of the 3rd pressure transmitter 29, so follows
Ring is reciprocal.
Start pressure measuring cylinder 1 on computer control unit 30 adds release control, due at the beginning of second pressure transmitter 14
Setting value P of the beginning pressure less than pressure measuring cylinder 12, therefore the 3rd magnetic valve 26, closing the 4th are opened in the control of computer control unit 30
Magnetic valve 27, to store up pressure cylinder 20 as pressure source, by second pipeline 23, the 3rd magnetic valve 26, the 3rd pipeline 24, pressure measuring cylinder 1
Second pressurization mouth 102 pressurizes into pressure measuring cylinder 1, until the internal pressure of pressure measuring cylinder 1 reaches setting value P2, in test, pressure measuring cylinder 1 it is interior
Pressure will be around setting value P2Fluctuate up and down, if exceeding preset pressure fluctuation range ± Δ P, computer control unit 30 is by the
Three magnetic valves 26, the keying of the 4th magnetic valve 27 and Flow-rate adjustment, realization adds, release fine setting, so that the internal pressure of pressure measuring cylinder 1 is protected
It is fixed to keep steady.
The internal pressure of pressure measuring cylinder 1 is stable in setting value P2Afterwards, the fatigue of housing test specimen 2 is started on computer control unit 30
Controlling test, by setup program P1→P0→P1→P0→... ... is circulated to the inner chamber of housing test specimen 1 plus unloads press operation.Specifically
Ground, during pressurization, the control of computer control unit 30 is opened the first magnetic valve 21, closes the second magnetic valve 22, discharges storage pressure cylinder
High-pressure fluid in 20, passes sequentially through the first pipeline 18, the first magnetic valve 21, the second high pressure rubber hose 11, the second watertight and connects
Fitting 9, the watertight connector 8 of steel bellow 10 and first, final injection housing test specimen 2, make the pressure of the internal water of housing test specimen 2
Raise；During release, the control of computer control unit 30 is opened the second magnetic valve 22, closes the first magnetic valve 21, makes housing test specimen 2
Internal pressure along it is aforementioned pressurization route inversely return, the second magnetic valves of Jing 22 are released to the first discharge pipe line 19.Due to trying in housing
The accumulator 3 or accumulator group of preliminary filling internal pressure are placed with inside part 2, the internal capacity of housing test specimen 2 has been reduced significantly, test is made
Middle participation adds, the volume of the water of stress-relief process greatly reduces, and 3 preliminary filling internal pressure will not be damaged through dual-seal in accumulator
Lose, thus external pressure fatigue test speed can be accelerated, while reducing the power output of force (forcing) pump 28 and the work of whole experimental rig
Loss.
The present invention takes pressure measuring cylinder to keep the method for constant internal pressure, the internal pressure lifting of control housing test specimen 2 to follow carrying out external pressure
Ring adds and unloads load fatigue test, to avoid the fatigue damage of pressure measuring cylinder itself.
Above description is explanation of the invention, is not the restriction to inventing, and limited range of the present invention is referring to right
Require, within protection scope of the present invention, any type of modification can be made.
Claims (10)
1. the Shell Structures Under External Pressure fatigue experimental device with built-in accumulator, including pressure measuring cylinder (1) and its interior housing test specimen
(2), pressure measuring cylinder (1) is respectively equipped with plus depressurized system with housing test specimen (2), it is characterised in that：Be installed with housing test specimen (2) to
A few accumulator (3) with preliminary filling internal pressure.
2. the Shell Structures Under External Pressure fatigue experimental device of the built-in accumulator of band as described in claim 1, it is characterised in that：It is described
The quantity of accumulator (3) be two or more when, all accumulators (3) by being connected in series to form accumulator group two-by-two,
Connected by the first high pressure rubber hose (4) between two connected accumulators (3).
3. the Shell Structures Under External Pressure fatigue experimental device of the built-in accumulator of band as described in claim 2, it is characterised in that：It is described
In the accumulator (3) at accumulator group head and the tail two ends, an accumulator (3) is provided with the first pressurization mouth (301), another accumulator
(3) the first installing port (302) is provided with, on the first pressurization mouth (301) and the first installing port (302) one first section is respectively connected with
Only valve (5), on two the first stop valves (5) plug (6) is connected with.
4. the Shell Structures Under External Pressure fatigue experimental device of the built-in accumulator of band as described in claim 1, it is characterised in that：It is described
Housing test specimen (2) is provided with two the second installing ports (7), and pressure measuring cylinder (1) is provided with three the second installing ports (7), housing test specimen
(2) two the second installing ports (7) seal the first watertight connector (8) being connected with middle through-hole, the connection of the first watertight
Part (8) is internal with housing test specimen (2) ft connection by housing test specimen (2) by its middle through-hole；Three second of pressure measuring cylinder (1)
Installing port (7) seals the second watertight connector (9) being connected with middle through-hole；Three the second watertight connectors (9) and two
In individual first watertight connector (8), one end of two the second watertight connectors (9) connects respectively a first watertight connector
(8), and between the second watertight connector (9) and corresponding first watertight connector (8) connected by steel bellow (10), and
The other end of two the second watertight connectors (9) is respectively with the second high pressure rubber hose (11), first pressure transmitter (12) even
Connect, it is outside that the second high pressure rubber hose (11), first pressure transmitter (12) are respectively positioned on pressure measuring cylinder (1)；3rd the second watertight
By its middle through-hole by pressure measuring cylinder (1) inside and pressure measuring cylinder (1) ft connection, the 3rd the second watertight connects connector (9)
The external pipeline of part (9) is provided with second pressure transmitter (14).
5. the Shell Structures Under External Pressure fatigue experimental device of the built-in accumulator of band as described in claim 4, it is characterised in that：It is described
Second installing port (7) includes the through hole arranged on housing test specimen (2) wall or on pressure measuring cylinder (1) barrel, the axial direction of the through hole
On be connected with the tube coupling with middle through-hole (15), tube coupling (15) is connected with the through hole, and the middle through-hole of tube coupling (15) is step
Through there is the first watertight connector (8) in hole, the tube coupling (15) on housing test specimen (2), pass through in the tube coupling (15) on pressure measuring cylinder (1)
The second watertight connector (9) is installed with, the first watertight connector (8), the second watertight connector (9) carry male part (801), outward
Convex portion (801) one end abuts and is provided with therebetween seal (16) with the shaft shoulder of the stepped hole, male part (801) it is another
Held out against by nut (17) on end, nut (17) is connected by its external screw thread with the internal thread of the stepped hole.
6. the Shell Structures Under External Pressure fatigue experimental device of the built-in accumulator of band as described in claim 4, it is characterised in that：It is described
Second high pressure rubber hose (11) is connected by tee pipe fitting with the first pipeline (18), the first discharge pipe line (19), the first pipeline
(18) it is connected with storage pressure cylinder (20) outlet, and the first pipeline (18) is provided with the first magnetic valve (21), the first discharge pipe line (19)
It is provided with the second magnetic valve (22)；Storage pressure cylinder (20) outlet is connected with the second pipeline (23), and the second pipeline (23) is by three-way pipe
Part is connected with the 3rd pipeline (24), the second discharge pipe line (25), the second pressurization mouth of the 3rd pipeline (24) and pressure measuring cylinder (1)
(102) connect, the second pipeline (23) is provided with the 3rd magnetic valve (26), and the second discharge pipe line (25) is provided with the 4th magnetic valve
(27)；Storage pressure cylinder (20) import is connected with the outlet conduit of force (forcing) pump (28), and storage pressure cylinder (20) is provided with the 3rd pressure transmitter
(29)。
7. the Shell Structures Under External Pressure fatigue experimental device of the built-in accumulator of band as described in claim 6, it is characterised in that：It is described
First pressure transmitter (12), second pressure transmitter (14), the 3rd pressure transmitter (29), the first magnetic valve (21), second
Magnetic valve (22), the 3rd magnetic valve (26), the 4th magnetic valve (27) are connected by controlling cable and computer control unit (30)
Connect, computer control unit (30) is connected by controlling cable with the frequency converter (31) of force (forcing) pump (28).
8. the Shell Structures Under External Pressure fatigue experimental device of the built-in accumulator of band as described in claim 6, it is characterised in that：Respectively
Pacify on two the second watertight connectors (9) being connected with first pressure transmitter (12), second pressure transmitter (14)
Equipped with manual exhaust pressure-relief valve (32)；Second pressurization mouth (102) of the pressure measuring cylinder (1) and first pressure transmitter (12) are even
Safety valve (33) is mounted on the second watertight connector (9) for connecing；Is equipped with first pipeline (18), the second pipeline (23)
Two stop valves (34).
9. the Shell Structures Under External Pressure fatigue experimental device of the built-in accumulator of band as described in claim 1, it is characterised in that：It is described
The two ends of housing test specimen (2) are welded to connect respectively with upper cover (35), low head (36), and low head (36) is supported on pressure measuring cylinder
(1) on internal base (37)；The upper end open of pressure measuring cylinder (1), the upper end open is covered with cover (101), cover (101)
Flanged ends is with the connection end of pressure measuring cylinder (1) cylinder, described two flanged ends carry out circumference by snap ring (38)
It is affixed, sealing ring (39) is provided between described two flanged ends.
10. the Shell Structures Under External Pressure fatigue experimental device of the built-in accumulator of band as described in claim 9, it is characterised in that：Institute
Snap ring (38) is stated including at least two sections snap ring sections being evenly distributed, upper side plane, the pressure of the flanged ends of cover (101)
The underside plan of the flanged ends of cylinder (1) cylinder upper end open is with the inclined plane abutted with snap ring section cooperation；Each
The snap ring section bottom is provided with roller (40), is equipped with track (13) for roller (40) on the ground.
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