CN101672748B - 400MPa super-high pressure fatigue test device and test method - Google Patents
400MPa super-high pressure fatigue test device and test method Download PDFInfo
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Abstract
The invention relates to a 400MPa super-high pressure fatigue test device and a test method, wherein the test device consists of a hydraulic unit, a super-high pressure unit, a super-high pressure relief unit and a control unit. The 400MPa super-high pressure fatigue test device and the test method supply pressure oil to the low-pressure end of a booster in the super-high pressure unit, and the low-pressure water which is provided by a water supply tube is pressurized through the booster; and the super-high pressure water generated is transmitted to a super-high pressure test section through a super-high pressure joint. The pressure of the super-high pressure water is relieved by a controllable pressure relief valve and a damper; a tiny pressure relief channel is formed on a super-high pressure relief tube of the super-high pressure fatigue test device so as to effectively control the pressure relief speed; and when internal pressure fatigue test is carried out to a test piece on the basis of a trapezoidal wave pressure cycle, a plurality of small trapezoidal waves are overlapped at the upper limiting pressure-maintaining section of large trapezoidal wave test pressure, thereby being capable of completely simulating the pressure cycle which is born by the super-high pressure equipment such as a super-high pressure polyethylene tube type reactor and the like when in actual operation, and testing whether the fatigue life and limit thereof can meet the use requirements or not.
Description
Technical field
The present invention relates to the ultrahigh-pressure hydraulic fatigue experimental device, the high test pressures of more specifically say so pressure vessel and pressure pipeline reaches the UHV (ultra-high voltage) torture test complete equipment of 400MPa.
Background technology
Ultrahigh pressure vessel and pipeline are widely used in petrochemical complex, shaped by fluid pressure, mining, new material processing processing, military project and other special occasions, and in use often there are the pressure fatigue phenomenon in these ultrahigh pressure vessels or pipeline, therefore, the fatigue strength research to ultrahigh pressure vessel or pipeline is significant.
In the utility model patent of ZL 2,007 2 0041242.0, the applicant discloses a kind of 350MPa UHV (ultra-high voltage) fatigue test system, solved the ultrahigh pressure vessel Fatigue Test Research difficult problem of 350MPa pressure stage, can carry out the torture test of structural member or model configuration spare, can determine its fatigue limit reliably, study its fatigure failure rule exactly, can be widely used in all kinds of visual plants in the UHV (ultra-high voltage) polyethylene production device.But, because torture test pressure is high, the difficulty of aspects such as the complicacy of system and control technology, this system can't simulate the pressure cycling process of UHV (ultra-high voltage) tygon tubular type reactor in practical operation fully.In the practical operation, when cycling pressure reaches in limited time, the operating mode of pressure surge occurs owing to reasons such as technology cause the upper limit, up to now, also do not have relevant test unit can be influence and the fatigure failure rule research experiment of this operating mode for fatigue limit.
Summary of the invention
The present invention is for avoiding above-mentioned existing in prior technology weak point, a kind of 400MPa UHV (ultra-high voltage) fatigue experimental device is provided, be used to simulate the actual condition of ultrahigh pressure vessel pressure cycling fluctuation, the assurance of research technique is provided for the fatigue strength research that solves ultrahigh pressure vessel or pipeline.
Technical solution problem of the present invention adopts following technical scheme.
400MPa UHV (ultra-high voltage) fatigue experimental device of the present invention is made of hydraulic pressure unit, UHV (ultra-high voltage) unit, UHV (ultra-high voltage) pressure relief unit and control module, and its design feature is:
In the described hydraulic pressure unit, hydraulic reservoir is set, with the high-pressure oil pump group of motors is power source, series connection is provided with high pressure filter, oil feed non-return valve and three position four-way directional control valve in regular turn in main oil supply pipe I, two-way with described three position four-way directional control valve is exported pipeline road II and the pipeline road III that constitutes the two-way alternation, and pipeline II flow speed control valve and pipeline III flow speed control valve are set respectively in described pipeline road II and pipeline road III; Depressurized circuit is made of pipeline II flow speed control valve, pipeline III flow speed control valve, three-position four-way valve, two position three-way valve, major loop surplus valve and depressurized circuit surplus valve, tensimeter, air cooler and release pipeline IV;
Described UHV (ultra-high voltage) unit: provide the water source with centrifugal water pump, series connection is provided with filtrator, electro connecting pressure gauge and supercharger in regular turn in supply channel V; Series connection is provided with UHV (ultra-high voltage) tensimeter, safety valve and UHV (ultra-high voltage) joint in regular turn in UHV (ultra-high voltage) outlet pipeline VI;
Described UHV (ultra-high voltage) pressure relief unit: be in UHV (ultra-high voltage) release pipeline VII, controlled pressure-release valve, two-position-five-way solenoid valve and damper to be set;
Described control module: be to be detection signal, carry out the detection signal data processing, send control signal with switch board by computing machine with the oily warm galvanic couple that is arranged on UHV (ultra-high voltage) pressure transducer on the UHV (ultra-high voltage) outlet pipeline VI, is arranged in hydraulic reservoir.
The design feature of 400MPa UHV (ultra-high voltage) fatigue experimental device of the present invention also is:
The structure of described damper is set to, in damping seat inner chamber, connect vertically the formation damper bar is set with each damping piece, the front end of described damper bar is kept out with stepped hole in the inner chamber of damping seat, the other end of damper bar is to be spacer to keep off tight cover, tightly connect on cover, each damping piece and the damping seat at end cap, retaining against, pressure relief vent vertically by end cap; Be to be seal between the periphery of described damping piece and the damping seat with the back-up ring and the O-ring seal that are set up in parallel vertically.
It is coaxial internal and external casing structure that damping piece is set, and wherein outer tube is a metal sleeve, and inner sleeve is an alundum tube;
The characteristics of the test method of 400MPa UHV (ultra-high voltage) fatigue experimental device of the present invention are to press torture test in big trapezoidal wave pressure cycling test specimen being carried out, described big trapezoidal wave pressure cycling is boosted for carrying out in regular turn, pressurize, the pressure cycling mode of step-down again runs through or reaches predetermined times of fatigue until the defective expansion.
The characteristics of test method of the present invention also are a plurality of little trapezoidal waves that superpose of the test pressure upper limit P1 pressurize section at big trapezoidal wave, big trapezoidal wave low pressure limit is set at 0, greater than 0, set big trapezoidal wave pressure cycling frequency by the threshold pression P2 of described little trapezoidal wave less than 10 times/minute.
The technological principle of system of the present invention is the low pressure end supply pressure oil by hydraulic pressure unit supercharger in the UHV (ultra-high voltage) unit, and the low-pressure water that supply channel provides is through the supercharger supercharging, and the high-pressure water of generation is transported in the UHV (ultra-high voltage) test section by the UHV (ultra-high voltage) joint.The UHV (ultra-high voltage) pressure relief unit is set among the present invention, high-pressure water carries out release by controlled pressure-release valve and damper, on the UHV (ultra-high voltage) release pipeline of UHV (ultra-high voltage) fatigue experimental device, form small discharge channel, can control release speed effectively with this, serving as when pressing torture test in carry out test specimen on the basis with the trapezoidal wave pressure cycling, at big trapezoidal wave test pressure upper limit pressurize section several little trapezoidal waves that superpose again, the pressure cycling that is subjected in the time of can simulating extra-high tension unit practical operations such as UHV (ultra-high voltage) tygon tubular type reactor fully checks its fatigue lifetime and the limit whether can satisfy request for utilization.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the present invention can reach the hyperpressure of 400MPa pressure stage by complete hydraulic pressure unit, UHV (ultra-high voltage) unit, UHV (ultra-high voltage) pressure relief unit and control module are set;
2, perfect in shape and function of the present invention, unit can realize that test parameterss such as test pressure, tired frequency are regulated and the control module operation; Its compact conformation, novel unique, advanced technology and stable performance;
3, the present invention is simple in structure, reliable, can control release speed effectively, be implemented in the pressure surge operating mode that occurs on the circulating pressure in limited time, can simulate extra-high tension unit practical operation operating modes such as UHV (ultra-high voltage) tygon tubular type reactor fully, for the fatigue strength research of ultrahigh pressure vessel or pipeline is given security;
4, the present invention adopts damper as UHV (ultra-high voltage) release element, and it is low to unload flow rate, has effectively reduced UHV (ultra-high voltage) release liquid flow impact, helps whole table apparatus to increase the service life, and improves functional reliability.
Description of drawings
Fig. 1 is a system architecture synoptic diagram of the present invention.
Fig. 2 is a damper structure synoptic diagram of the present invention.
Fig. 3 is the single damping piece structural representation of the present invention.
Fig. 4 is a UHV (ultra-high voltage) torture test pressure cycling synoptic diagram of the present invention.
Number in the figure: 1 hydraulic reservoir, 2 air cleaner, 3 high-pressure oil pump group of motors, 4 high pressure filters, 5 differential pressure transmitter devices, 6 tensimeters, 7 electro connecting pressure gauges, 8 major loop surplus valves, 9 depressurized circuit surplus valves, 10 oil feed non-return valve, 11 three-position four-way valves, 12 two position three-way valves, 13a pipeline II flow speed control valve, 13b pipeline III flow speed control valve, 13 flow speed control valves, 14 tensimeters, 15 superchargers, 16 UHV (ultra-high voltage) tensimeters, 17 safety valve, 18 UHV (ultra-high voltage) pressure transducers, 19 controlled pressure-release valves, 20 two-position-five-way solenoid valves, 21 electro connecting pressure gauges, 22 filtrators, 23 centrifugal water pumps, 24 air cleaner, 25 water tanks, 26 air coolers, 27 thermopairs, 28 UHV (ultra-high voltage) joints, 29 switch boards, 30 computing machines, 31 dampers.
I master's oil feed line, II pipeline road, III pipeline road, IV release pipeline, V supply channel, VI UHV (ultra-high voltage) outlet pipeline, VII UHV (ultra-high voltage) release pipeline.
A gland, b damping seat, the tight cover of c retaining, d1 metal sleeve, d2 corundum damper tube, e back-up ring, f O-ring seal.
Below, in conjunction with the accompanying drawings the present invention is further described by embodiment:
Embodiment
Referring to Fig. 1, present embodiment is made of hydraulic pressure unit, UHV (ultra-high voltage) unit, UHV (ultra-high voltage) pressure relief unit and control module.
Shown in Figure 1, hydraulic reservoir 1 is set in the hydraulic pressure unit, with high-pressure oil pump group of motors 3 is power source, series connection is provided with high pressure filter 4, oil feed non-return valve 10 and three position four-way directional control valve 11 in regular turn in main oil feed line I, two-way with three position four-way directional control valve 11 is exported pipeline road II and the pipeline road III that constitutes the two-way alternation, and pipeline II flow speed control valve 13a and pipeline III flow speed control valve 13b are set respectively in pipeline road II and pipeline road III; Depressurized circuit is made of pipeline II flow speed control valve 13a, pipeline III flow speed control valve 13b, three-position four-way valve 11, two position three-way valve 12, surplus valve 8 and 9, tensimeter 14, air cooler 26 and release pipeline IV;
The UHV (ultra-high voltage) unit is to provide the water source by centrifugal water pump 23 by water tank 25, and series connection is provided with filtrator 22, electro connecting pressure gauge 21 and supercharger 15 in regular turn in supply channel V; Series connection is provided with UHV (ultra-high voltage) tensimeter 16, safety valve 17, UHV (ultra-high voltage) pressure transducer 18 and UHV (ultra-high voltage) joint 28 in regular turn in UHV (ultra-high voltage) outlet pipeline VI;
The UHV (ultra-high voltage) pressure relief unit is in UHV (ultra-high voltage) release pipeline VII controlled pressure-release valve 19, two-position-five-way solenoid valve 20 and damper 31 to be set;
Control module is to be detection signal with the oily warm galvanic couple 27 that is arranged on UHV (ultra-high voltage) pressure transducer 18 on the UHV (ultra-high voltage) outlet pipeline VI, is arranged in hydraulic reservoir 1, carries out the detection signal data processing by computing machine 30, sends control signal with switch board 29.
Fig. 2, shown in Figure 3, the structure of damper 31 is set to, in damping seat b inner chamber, connect vertically the formation damper bar is set with each damping piece d, the front end of damper bar is kept out with stepped hole in the inner chamber of damping seat b, the other end of damper bar is to be spacer to keep off tight cover c, connect in end cap a, retaining tight cover c, each damping piece d and damping seat b against, pressure relief vent vertically by end cap a; Be to be seal between the periphery of damping piece d and the damping seat b with the back-up ring (e) and the O-ring seal (f) that are set up in parallel vertically, damping piece (d) is set is coaxial internal and external casing structure, wherein outer tube is that metal sleeve (d1) plays withstand voltage effect, inner sleeve is alundum tube (d2), this structure setting can be anti-high speed impact and wearing and tearing when high-pressure water is released during release.
Present embodiment is to extra high voltage system delivery hydraulic pressure oil by hydraulic system, top pressure reaches 20MPa, will be through the high-pressure water after the extra high voltage system supercharging, be up to 400Mpa, be transported in the UHV (ultra-high voltage) sample, and then the sample internal pressure is regulated control by depressurized system, the pressure cycling that is subjected in the time of can simulating the work of UHV (ultra-high voltage) pressure vessel fully checks its fatigue lifetime and the limit whether can satisfy request for utilization.
UHV (ultra-high voltage) fatigue experimental device in the present embodiment can be realized with big trapezoidal wave pressure cycling test specimen being carried out the interior torture test of pressing, described big trapezoidal wave pressure cycling is that employing is boosted, pressurize, the pressure cycling mode of step-down again runs through or reaches predetermined times of fatigue until the defective expansion.
Several little trapezoidal waves that can also superpose in the test pressure upper limit P1 pressurize section of big trapezoidal wave, big trapezoidal wave low pressure limit is set at 0, greater than 0, sets big trapezoidal wave pressure cycling frequency less than 10 times/minute by the threshold pression P2 of described little trapezoidal wave.
In concrete the enforcement, high-pressure oil pump group of motors 3 adopts variable output pumps, can be before test according to the delivery rate of fatigue experiment required pressure cycle frequency manual adjustments pump; Perhaps also can change the delivery rate of oil pump by the rotating speed that frequency converter is regulated drive motor.
During system works, hydraulic oil is transported in the main oil feed line I through behind high pressure filter 4 fine filterings, and the working pressure of system is by 8 controls of major loop surplus valve and can be simultaneously displayed on the worktable by tensimeter 6 and pressure transducer 7 and secondary instrument.Why simultaneously selection pressure table 6 and pressure transducer 7 be as the element of monitoring system working pressure, is in order to prevent in the use, and pressure transducer zero drift and cause monitoring inaccurate is used can guarantee testing result accurately and reliably simultaneously.
Hydraulic reservoir 1 sidewall of system is equipped with liquid level gauge to show the oil level in the hydraulic reservoir 1, and the fuel tank top is equipped with air cleaner 2 and is consistent with guard box internal gas pressure and atmospheric pressure.The sidewall middle part of hydraulic reservoir 1 also is equipped with oily warm galvanic couple 27 with oil temperature in the monitoring case.When the oil temperature was too high, this thermopair sent signal to control system, and air cooler 26 heat radiations of installing on the starting box body sidewall guarantee that oily temperature is no more than the temperature that system sets.Using air cooler 26 in the system is when preventing that winter from operating, and causes the refrigeratory damage just in case forget the water of putting in the clean refrigeratory.
On the high pressure filter 4 that system uses differential pressure transmitter device 5 is installed, when the filter element obstruction causes the inlet and outlet pressure difference to exceed setting value, this device can be sent out signal automatically, remind operator's renew cartridge more in time, to prevent that the filter core breakage from polluting impurity and entering the bigger damage of formation in system's principal pressure oil pipe.
The element of all hydraulic system all is centrally mounted on the food tray, and wherein operation valve adopts integrated package to install.Floor area that so both can reduction system also is convenient to change and repair and maintenance.
Extra high voltage system is imported and exported the big piston to-and-fro movement that promotes in the super supercharger low pressure (LP) cylinder by hydraulic system pipeline road II and pipeline road III alternation delivery hydraulic pressure oil to the hydraulic oil of supercharger 15, big piston drives the valve piston motion in the ultra-high pressure cylinder that fuses with it, and high-pressure water is sent to test specimen by the high-pressure water outlet of supercharger 15 and the UHV (ultra-high voltage) pipeline is finished supercharging thereby the extruding low-pressure water produces.
The UHV (ultra-high voltage) release is to be pressure source with the pressure in the test specimen, opens UHV (ultra-high voltage) pipeline VII by the controlled pressure-release valve 19 of two-position-five-way solenoid valve 20 controls and finishes controlled release.By the small passage of damper 31 formation latus rectum 0.15mm, pressure boost is unloaded the resistance of putting, and controls release speed effectively.
Hydraulic reservoir 1 sidewall of hydraulic system is equipped with oily warm galvanic couple 27 with oil temperature in the monitoring fuel tank.When the oil temperature was too high, thermopair 27 sent signal to control system, started 26 pairs of high temperature oil of forced air cooler and cooled off.After the temperature that oily temperature drop sets to system, forced air cooler 26 stops automatically.
On the high pressure filter 4 that system uses differential pressure transmitter device 5 is installed, when the filter element obstruction causes the inlet and outlet pressure difference to exceed setting value, this device can be sent out signal automatically, report high pressure filter fault, show on computers, and force to stop main oil pump in the main oil pump motor group 3, only after fault is got rid of, can start main oil pump.
Control system use a computer 30 and switch board 29 finish, the startup of system, stop, running and warning etc. all can directly be achieved by the control knob that shows on the click LCD and show, also can show pressure-time curve or strain-time curve in real time by the mode of switch window.
Control module adopts Programmable Logic Controller PLC as main controlling element, can the minimizing system in the joint quantity of electric wire, increase system reliability; Control function be can change at the change control program, and the hardware and the wiring of the system that changes do not needed, also can be by reserving expanded function, the control function of expanding system has easily increased the dirigibility and the extendability of system greatly, is convenient to upgrading.
For data acquisition and recording section, the data acquisition mouth of four passages is set in the system altogether, one of them passage is used to gather hydraulic system working pressure and UHV (ultra-high voltage) part working pressure, a passage is used to gather the strain signal that strain transducer is measured, two other passage temporarily is used for backup, waits for later expansion.
Native system can be realized four kinds of duties:
1, boosts and once finish, unload and be depressed into 0 torture test duty;
2, boost and once finish, release is not 0 torture test duty;
3, repeatedly finish and boost, unload and be depressed into 0 torture test duty;
4, repeatedly finish and boost, release is not 0 torture test duty.
The systems technology parameter
UHV (ultra-high voltage) section pressure cycling amplitude: 0～400MPa
Maximum pressure cycle frequency: 20 times/min (adjustable)
Groundwork state: four kinds
Extra high voltage system medium: clean water
Hydraulic system's media: N46 machinery oil.
Claims (5)
1.400MPa the UHV (ultra-high voltage) fatigue experimental device is made of hydraulic pressure unit, UHV (ultra-high voltage) unit, UHV (ultra-high voltage) pressure relief unit and control module, it is characterized in that:
In the described hydraulic pressure unit, hydraulic reservoir (1) is set, with high-pressure oil pump group of motors (3) is power source, series connection is provided with high pressure filter (4), oil feed non-return valve (10) and three-position four-way valve (11) in regular turn in main oil supply pipe I, two-way with described three-position four-way valve (11) is exported pipeline road II and the pipeline road III that constitutes the two-way alternation, and pipeline II flow speed control valve (13a) and pipeline III flow speed control valve (13b) are set respectively in described pipeline road II and pipeline road III; Depressurized circuit is made of pipeline II flow speed control valve (13a), pipeline III flow speed control valve (13b), three-position four-way valve (11), two position three-way valve (12), major loop surplus valve (8) and depressurized circuit surplus valve (9), tensimeter (14), air cooler (26) and release pipeline IV;
Described UHV (ultra-high voltage) unit provides the water source with centrifugal water pump (23), and series connection is provided with filtrator (22), electro connecting pressure gauge (21) and supercharger (15) in regular turn in supply channel V; Series connection is provided with UHV (ultra-high voltage) tensimeter (16), safety valve (17) and UHV (ultra-high voltage) joint (28) in regular turn in UHV (ultra-high voltage) outlet pipeline VI;
Described UHV (ultra-high voltage) pressure relief unit is that controlled pressure-release valve (19), two-position-five-way solenoid valve (20) and damper (31) are set in UHV (ultra-high voltage) release pipeline VII;
Described control module, be to be detection signal with the oily warm galvanic couple (27) that is arranged on UHV (ultra-high voltage) pressure transducer (18) on the UHV (ultra-high voltage) outlet pipeline VI, is arranged in hydraulic reservoir (1), carry out the detection signal data processing by computing machine (30), send control signal with switch board (29).
2. 400MPa UHV (ultra-high voltage) fatigue experimental device according to claim 1, the structure that it is characterized in that described damper (31) is set to, in damping seat (b) inner chamber, connect vertically the formation damper bar is set with each damping piece (d), the front end of described damper bar is kept out with stepped hole in the inner chamber of damping seat (b), the other end of damper bar is to be spacer to keep off tight cover (c), go up at end cap (a), the tight cover of retaining (c), each damping piece (d) and damping seat (b) against, pressure relief vent vertically by end cap (a) and to connect; Be to be seal between the periphery of described damping piece (d) and the damping seat (b) with the back-up ring (e) and the O-ring seal (f) that are set up in parallel vertically.
3. 400MPa UHV (ultra-high voltage) fatigue experimental device according to claim 2 is characterized in that being provided with damping piece (d) and is coaxial internal and external casing structure, and wherein outer tube is metal sleeve (d1), and inner sleeve is alundum tube (d2).
4. the test method of the described 400MPa UHV (ultra-high voltage) of claim 1 fatigue experimental device, it is characterized in that test specimen being carried out the interior torture test of pressing with big trapezoidal wave pressure cycling, described big trapezoidal wave pressure cycling is boosted for carrying out in regular turn, pressurize, the pressure cycling mode of step-down again runs through or reaches predetermined times of fatigue until the defective expansion.
5. test method according to claim 4, it is characterized in that test pressure upper limit P1 pressurize section at big trapezoidal wave a plurality of little trapezoidal waves that superpose, big trapezoidal wave low pressure limit is set at 0, greater than 0, set big trapezoidal wave pressure cycling frequency by the threshold pression P2 of described little trapezoidal wave less than 10 times/minute.
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Address after: 230031 Hefei Changjiang Road, Shushan District, Anhui, No. 888 Patentee after: Hefei Universal Machinery Inst. Patentee after: Special Equipment Inspection Station of Hefei General Machinery Research Institute Address before: 230031 Hefei Changjiang Road, Shushan District, Anhui, No. 888 Patentee before: Hefei Universal Machinery Inst. Patentee before: pressure vessel Testing Station of Hefei General Machinery Research Institute |
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Address after: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee after: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE Co.,Ltd. Patentee after: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE SPECIAL EQUIPMENT INSPECTION STATION Co.,Ltd. Address before: 230031 No. 888 Changjiang West Road, Shushan District, Anhui, Hefei Patentee before: HEFEI GENERAL MACHINERY Research Institute Patentee before: SPECIAL EQUIPMENT INSPECTION STATION OF HEFEI GENERAL MACHINERY Research Institute |
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