CN112748063A - Ultra-long-service-life environmental fatigue test system and method for dynamic intelligent control of dissolved oxygen - Google Patents
Ultra-long-service-life environmental fatigue test system and method for dynamic intelligent control of dissolved oxygen Download PDFInfo
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- 239000001301 oxygen Substances 0.000 title claims abstract description 244
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 244
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 239
- 238000009661 fatigue test Methods 0.000 title claims abstract description 122
- 230000007613 environmental effect Effects 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims description 20
- 239000007788 liquid Substances 0.000 claims abstract description 143
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000012360 testing method Methods 0.000 claims abstract description 64
- 238000001514 detection method Methods 0.000 claims abstract description 47
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 238000010992 reflux Methods 0.000 claims abstract description 19
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims description 26
- 239000000523 sample Substances 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 12
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 10
- 229920001971 elastomer Polymers 0.000 claims description 9
- 230000005284 excitation Effects 0.000 claims description 7
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- 238000007789 sealing Methods 0.000 claims description 5
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- 238000007599 discharging Methods 0.000 claims description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 22
- 239000008367 deionised water Substances 0.000 description 16
- 229910021641 deionized water Inorganic materials 0.000 description 16
- 239000000463 material Substances 0.000 description 14
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 8
- 229920006395 saturated elastomer Polymers 0.000 description 7
- 238000010998 test method Methods 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 238000011156 evaluation Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention provides an ultra-long-life environmental fatigue test system for dynamic intelligent control of solution oxygen content, which comprises: a dissolved oxygen dynamic intelligent control device with a liquid storage tank, a nitrogen steel cylinder, a vacuum pump, a pressure gauge, a reflux tank, a dissolved oxygen detection unit, an electromagnetic valve and a computer control platform, a fatigue test testing device with a high-frequency fatigue testing machine, a testing machine control cabinet and an environment box, a supply path for supplying an environment medium and a recovery path for recovering the environment medium, wherein a centrifugal pump and a heater are arranged in the supply path, a condenser is arranged in the recovery path, an inlet of the environment box is connected with a liquid supply port of the liquid storage box, an outlet of the environment box is connected with the reflux groove, the dissolved oxygen dynamic intelligent control device dynamically monitors and controls the dissolved oxygen of the environment medium in the liquid storage box through the computer control platform, when the dissolved oxygen amount of the environmental medium reaches a preset value, the centrifugal pump is started to convey the environmental medium into the environmental box, and then the environmental medium is cooled by the condenser and then is recycled to the reflux tank.
Description
Technical Field
The invention relates to the field of material corrosion fatigue test in an extreme environment, in particular to an ultra-long-life environment fatigue test system with dynamic intelligent dissolved oxygen control and a method for performing fatigue test by using the ultra-long-life environment fatigue test system with dynamic intelligent dissolved oxygen control.
Background
Engineering materials and structures in service in the fields of petrochemical industry and electric power not only bear alternating load, but also are corroded by service environment, and are often subjected to corrosion fatigue damage. To ensure its structural integrity, it is necessary to test its environmental fatigue properties. For example, as the demand for power is becoming more and more intense, the rotational speed of the turbine is increasing, which causes the number of times that the last-stage blades of the turbine are subjected to alternating loads in extreme environments to increase, and the risk of the blades being subjected to corrosion fatigue damage is significantly increased.
In order to design and manufacture safe and reliable blades and evaluate the corrosion fatigue life of the blades, the service working conditions of the blades in a laboratory are urgently needed to obtain environmental fatigue data of materials and structures, and development of the research is necessary to develop a fatigue test system capable of developing the low-oxygen saturated wet steam environment and the saline water environment.
It is worth noting that the dissolved oxygen in the test system changes along with the extension of the test time, if the dissolved oxygen in the environment medium is too high, the oxidation corrosion failure of the material is accelerated, and the performance of the material in the actual service environment cannot be accurately obtained. Unreliable test data can cause misjudgment to engineering structure design, so that the design structure is too large, and unnecessary waste is caused. Therefore, real-time monitoring and online intelligent control of the dissolved oxygen in the test system are very important, and the actual service condition data of the material can be accurately obtained only by ensuring that the material is tested in an environment below a set dissolved oxygen value all the time, so that guidance is provided for enterprise design departments.
In the prior art, patent document 1 discloses a full-automatic boiler feed water oxygenation device, and patent document 2 discloses a fatigue evaluation method of a nuclear power plant fatigue monitoring and life evaluation system, both of which provide devices capable of adjusting the dissolved oxygen amount in water, but cannot meet the requirement of reducing the dissolved oxygen amount, and cannot realize dynamic monitoring and adjustment. Patent document 3 discloses a high-frequency fatigue life test system and a test method in a high-temperature steam environment, but the oxygen content in the solution cannot be dynamically monitored and adjusted, so that an ultra-long life environmental fatigue test cannot be performed; if long-time testing is carried out, the dissolved oxygen cannot be monitored in real time and automatically adjusted, so that the testing result and the true value have larger deviation, and the data cannot be directly applied. In order to solve the industrial demand, a set of dissolved oxygen dynamic intelligent control ultra-long-life environmental fatigue test system is urgently needed to be designed.
Documents of the prior art
Patent document
Patent document 1: chinese patent publication CN108693819A
Patent document 2: chinese patent publication CN111312414A
Patent document 3: chinese patent publication CN103954514A
Disclosure of Invention
The invention is made in view of the technical problems in the prior art, and aims to provide an ultra-long-life environmental fatigue test system for dynamically and intelligently controlling the oxygen content of a solution, which can realize the dynamic monitoring of the dissolved oxygen content for an ultra-long time and the online closed-loop intelligent control, has high monitoring and control precision, and ensures that the dissolved oxygen content of an environmental medium required by a fatigue test meets the test requirements.
The invention also aims to provide an ultra-long-service-life environmental fatigue test method for dynamically and intelligently controlling the oxygen content of the solution, which can realize the dynamic monitoring of the dissolved oxygen content for an ultra-long time and the online closed-loop intelligent control, has high monitoring and control precision and ensures that the dissolved oxygen content of the environmental medium required by the fatigue test meets the test requirement.
In order to achieve the above object, the present invention provides the following technical solutions.
[ 1 ] an ultra-long life environmental fatigue test system of dynamic intelligent control of dissolved oxygen volume, it includes: a dissolved oxygen dynamic intelligent control device, a fatigue test device, a supply path for supplying an environmental medium to the fatigue test device, and a recovery path for recovering the environmental medium,
the dynamic intelligent dissolved oxygen control device comprises a liquid storage tank, a nitrogen steel cylinder, a vacuum pump, a pressure gauge, a reflux tank, a dissolved oxygen detection unit, an electromagnetic valve and a computer control platform,
the fatigue test device comprises a high-frequency fatigue tester, a tester control cabinet and an environment box,
the inlet of the environment tank is connected with the liquid supply port of the liquid storage tank through the supply path, the outlet of the environment tank is connected with the reflux groove through the recovery path,
a centrifugal pump and a heater are provided in the supply path, a condenser is provided in the recovery path,
the dynamic intelligent dissolved oxygen control device dynamically monitors and controls the dissolved oxygen of an environment medium in the liquid storage tank through the computer control platform, when the dissolved oxygen of the environment medium reaches a preset value, the centrifugal pump is started to convey the environment medium into the environment tank of the fatigue test testing device, and then the environment medium is cooled through the condenser and then is recycled to the reflux tank.
The ultra-long-life environmental fatigue test system according to [ 1 ], wherein an air inlet port, an air outlet port, a vacuum port, and the pressure gauge are provided in a tank cover of the liquid storage tank, an air inlet port is provided in an upper side portion of the liquid storage tank, an air outlet port for supplying an environmental medium to the dissolved oxygen amount detection means and an air supply port for supplying an environmental medium to the environmental tank are provided in a bottom portion of the liquid storage tank, solenoid valves for controlling a flow of a fluid are provided in the ports, and a solenoid valve for controlling a flow of a fluid is provided between the condenser and the reflux tank.
(3) the ultra-long-life environmental fatigue test system with dynamic intelligent control of dissolved oxygen amount according to (2), wherein the air inlet port is connected to the nitrogen steel cylinder through an air inlet electromagnetic valve, nitrogen is introduced from the nitrogen steel cylinder to the bottom of the liquid storage tank,
the air outlet port is connected to the atmosphere through an air release solenoid valve which is a one-way valve and used for exhausting air from the liquid storage tank to the outside,
the vacuum pumping port is connected to the vacuum pump through a vacuum pumping electromagnetic valve, the vacuum pump is used for pumping the liquid storage tank to negative pressure, and residual air is discharged.
The liquid inlet port is connected with an environment medium supply source and the dissolved oxygen amount detection unit.
(4) the dissolved oxygen dynamic intelligent control ultra-long-life environmental fatigue test system as in (1) or (2), wherein the dissolved oxygen detection unit comprises a liquid collector, a dissolved oxygen detection container and a dissolved oxygen meter,
one side of the liquid collector is connected with one discharge port of the liquid storage tank, the other side of the liquid collector is connected with the dissolved oxygen detection container, a balloon is arranged on the liquid collector and used for discharging residual gas in the solution collector before primary measurement,
the dissolved oxygen meter is arranged in the dissolved oxygen detecting container, the dissolved oxygen meter measures the dissolved oxygen of the collected liquid in the dissolved oxygen detecting container,
the signal output end of the dissolved oxygen meter is connected to the computer control platform, and the measured dissolved oxygen quantity value is sent to the computer control platform, so that the dynamic intelligent control of the dissolved oxygen quantity is realized.
(5) the ultra-long-life environmental fatigue test system with dynamic intelligent control of dissolved oxygen amount according to (4), wherein the dissolved oxygen meter is installed in the dissolved oxygen amount detection container in a threaded connection mode, and a rubber gasket is used for sealing between the dissolved oxygen meter and the dissolved oxygen amount detection container;
when the dissolved oxygen amount is detected, the dissolved oxygen amount detection container is filled with liquid, and the probe of the dissolved oxygen meter is ensured to be completely immersed in the liquid.
And (6) the ultra-long-life environmental fatigue test system with dynamic intelligent dissolved oxygen control as described in (4), wherein the joints in the ultra-long-life environmental fatigue test system are hermetically connected by rubber gaskets, and after the fatigue test is started, the whole system is in a sealed state completely isolated from the atmosphere.
[ 7 ] the ultra-long life environmental fatigue test system of dynamic intelligent control of dissolved oxygen amount according to [ 1 ], wherein, the high frequency fatigue test machine includes: a base, a plurality of upright posts vertically arranged and fixed on the base, a beam arranged on the upper parts of the upright posts, an excitation device arranged on the beam, a load transfer device connected below the excitation device, an upper chuck arranged at the lower end of the load transfer device and a lower chuck arranged on the base,
the environment box is positioned between the upper chuck and the lower chuck and fixed on the upright post, sample mounting holes for a sample to pass through are arranged on the upper end surface and the lower end surface of the environment box, the upper end and the lower end of the sample are respectively connected with the upper chuck and the lower chuck, and the sample mounting holes are in sealing connection through rubber gaskets.
A method for fatigue test of an ultra-long life environment using the system for fatigue test of an ultra-long life environment with dynamic intelligent control of dissolved oxygen amount according to any one of the above items [ 1 ] to [ 7 ], comprising the steps of:
the first step is as follows: opening a corresponding electromagnetic valve to enable a first loop formed by a liquid storage tank, a centrifugal pump, a heater, an environment tank, a condenser and a reflux tank and a second loop formed by the liquid storage tank, a nitrogen steel cylinder, a vacuum pump and a dissolved oxygen detection unit to be completely communicated, starting the vacuum pump to exhaust residual air in a test system, automatically closing the vacuum pump and the first loop after the pressure is reduced to an ideal value, and opening the electromagnetic valve at a liquid inlet port of the liquid storage tank to inject an environment medium into the liquid storage tank to an ideal liquid level;
the second step is that: opening the pressure reducing valve of the nitrogen steel cylinder, adjusting the pressure to an ideal value, opening the air inlet port and the air outlet port of the liquid storage tank, and keeping the air pressure in the test system balanced by adjusting the air inlet electromagnetic valve arranged at the air inlet port and the air discharge electromagnetic valve arranged at the air outlet port;
the third step: opening an electromagnetic valve at a discharge port of the liquid storage tank connected with the dissolved oxygen detection unit to enable the environmental medium to enter a liquid collector of the dissolved oxygen detection unit, and simultaneously squeezing the balloon to enable the dissolved oxygen detection container to be filled with the environmental medium;
the fourth step: starting the dissolved oxygen meter, dynamically monitoring the dissolved oxygen of the environmental medium in the dissolved oxygen detection container, sending detection data to a computer control platform by the dissolved oxygen meter, and entering a fifth step after the dissolved oxygen is stable when the dissolved oxygen of the environmental medium is below 50% of a specified value; when the dissolved oxygen of the environment medium is greater than 50% of the specified value, the environment medium flows into the liquid storage tank, the pressure of the liquid storage tank is automatically adjusted, and nitrogen is continuously introduced to remove oxygen until the dissolved oxygen of the environment medium reaches less than 50% of the specified value;
the fifth step: the pressure reducing valve of the nitrogen steel cylinder is automatically closed, then the electromagnetic valve connected with the discharge port of the liquid storage tank in the first loop is automatically opened, and the centrifugal pump is started to convey the environment medium with the dissolved oxygen of less than 50% of the specified value into the environment tank;
and a sixth step: after the environment medium in the environment box is stabilized, setting fatigue test parameters through a test machine control cabinet connected with a high-frequency fatigue test machine, and starting the high-frequency fatigue test machine;
the seventh step: after the fatigue test is started, if the dissolved oxygen in the test system is greater than 50% of the specified value, the first loop is continuously opened, meanwhile, the pressure reducing valve of the nitrogen steel cylinder in the second loop is automatically opened, nitrogen is introduced into the liquid storage tank, the pressure of the liquid storage tank can be automatically adjusted to remove oxygen, and when the dissolved oxygen of the environmental medium is less than 50% of the specified value, the pressure reducing valve of the nitrogen steel cylinder is automatically closed.
The method for testing ultra-long-life environmental fatigue by dynamic intelligent control of dissolved oxygen amount according to item 9, wherein in the fifth step, the environmental medium is heated to a predetermined temperature or heated to form steam by a heater provided between the centrifugal pump and the environmental tank, and the heated environmental medium or the steam thereof is supplied to the environmental tank.
The method for testing the fatigue of the environment with the ultra-long service life by dynamically and intelligently controlling the dissolved oxygen amount according to the item (8), further comprising an eighth step of: and acquiring test data from a computer connected with the fatigue testing machine control cabinet, and drawing a fatigue S-N curve.
Technical effects
The ultra-long-life environmental fatigue test system for dynamic intelligent control of dissolved oxygen can realize dynamic monitoring of dissolved oxygen for an ultra-long time and online closed-loop intelligent control, has high monitoring and control precision, and ensures that the dissolved oxygen of an environmental medium required by a fatigue test meets test requirements.
The ultra-long-life environmental fatigue test method for dynamic intelligent control of dissolved oxygen can realize dynamic monitoring of dissolved oxygen for an ultra-long time and online closed-loop intelligent control, has high monitoring and control precision, ensures that the dissolved oxygen of an environmental medium required by a fatigue test meets test requirements, and has simple test method and strong operability.
Other aspects, features and advantages of the present invention will become apparent in the following detailed description.
Drawings
Fig. 1 is a schematic configuration diagram of an ultra-long life environmental fatigue test system for dynamic intelligent control of dissolved oxygen amount according to an embodiment of the present invention.
Fig. 2 is a schematic configuration diagram of a dissolved oxygen dynamic intelligent control device according to an embodiment of the present invention.
FIG. 3 is a graph showing the results of monitoring dissolved oxygen in accordance with the example of the present invention.
FIG. 4 is a fatigue S-N plot for an environmental fatigue test of an embodiment of the present invention.
Description of the symbols
1 … … dynamic intelligent control device for dissolved oxygen, 2 … … centrifugal pump, 3 … … flow control valve, 4 … … heater, 5 … … condenser, 6 … … lower chuck, 7 … … environment box, 8 … … thermocouple temperature measuring tube, 9 … … upper chuck, 10 … … cross beam, 11 … … vibration excitation device, 12 … … load transfer device, 13 … … sample, 14 … … liquid discharge valve, 15 … … base, 16 … … test machine control cabinet; 101 … … nitrogen gas cylinder, 102 … … pressure gauge, 103 … … pressure reducing valve, 104 … … vacuum pump, 105 … … reflux tank, 106 … … electromagnetic valve (ball valve), 107 … … drain valve, 108 … … liquid supply electromagnetic valve (power valve), 109 … … liquid storage tank, 110 … … liquid supply electromagnetic valve (power valve), 111 … … liquid collector, 112 … … drain valve, 113 … … balloon, 114 … … dissolved oxygen amount detection container, 115 … … computer control platform, 116 … … dissolved oxygen meter, 117 … … screwing valve, 118 … … liquid inlet end electromagnetic valve (ball valve), 119 … … emptying electromagnetic valve (check valve), 120 … … air inlet electromagnetic valve (ball valve), 121 … … pressure gauge, 122 … … vacuum pumping electromagnetic valve (ball valve).
Detailed Description
The technical features of the present invention are described below in connection with preferred embodiments, which are intended to illustrate the present invention and not to limit the present invention. The drawings are greatly simplified for illustration purposes and are not necessarily drawn to scale.
It should be understood that various obvious modifications, changes and equivalents may be made by those skilled in the art on the basis of the embodiments and examples shown below, and that technical features in different embodiments described below may be arbitrarily combined without contradiction, and that these are within the scope of the present invention.
[ ultra-long life environmental fatigue test system ]
The ultra-long life environmental fatigue test system (hereinafter also simply referred to as "ultra-long life environmental fatigue test system" or "test system") for dynamic intelligent control of dissolved oxygen amount according to the present invention will be described with reference to fig. 1 and 2. Fig. 1 is a schematic configuration diagram of an ultra-long life environmental fatigue test system for dynamic intelligent control of dissolved oxygen amount according to an embodiment of the present invention. Fig. 2 is a schematic configuration diagram of a dissolved oxygen dynamic intelligent control device according to an embodiment of the present invention.
According to a preferred embodiment of the present invention, as shown in fig. 1, the ultra-long life environmental fatigue test system of the present invention includes a dissolved oxygen dynamic intelligent control device 1, a fatigue test device, and a supply path for supplying an environmental medium to the fatigue test device and a recovery path for recovering the environmental medium.
The above-mentioned dissolved oxygen dynamic intelligent control device 1, as shown in fig. 2, includes a liquid storage tank 109, a nitrogen gas steel cylinder 101, a vacuum pump 104, a pressure gauge 121, a dissolved oxygen amount detection unit, a reflux tank 105, an electromagnetic valve, and a computer control platform 115.
The fatigue test device comprises a high-frequency fatigue testing machine, a testing machine control cabinet and an environment box 7.
In the supply path, a centrifugal pump 2 and a heater 4 are provided, and a flow control valve 3 is provided as needed. The environment medium with the dissolved oxygen meeting the requirement is conveyed into the environment box 7 through the centrifugal pump 2. The heater 4 is preferably arranged between the centrifugal pump 2 and the ambient box 7, and the ambient medium can be heated to a predetermined temperature or heated by the heater 4 to form steam, whereby the heated ambient medium or its steam can be supplied into the ambient box 7. In addition, in the case where the flow rate control valve 3 is provided, an electromagnetic valve that can be controlled based on a computer signal is used as the flow rate control valve 3.
The recovery path is provided with a condenser 5, and the ambient medium or its vapor discharged from the ambient tank 7 is cooled and condensed by the condenser 5 and then recovered in the reflux tank 105.
The inlet of the environmental tank 7 is connected to the liquid supply port of the liquid storage tank 109 through a supply path, and the outlet is connected to the return tank 105 through a recovery path.
In some preferred embodiments, an air inlet port, an air outlet port, a vacuum port, and a pressure gauge 121 are provided on a cover of the liquid storage tank 109, an air inlet port is provided on an upper side of the liquid storage tank 109, a discharge port for supplying the environmental medium to the dissolved oxygen amount detection unit and a liquid supply port for supplying the environmental medium to the environmental tank 7 are provided on a bottom of the liquid storage tank 109, and an electromagnetic valve for controlling a flow of a fluid (for example, liquid and/or gas) is provided at each port. Further, a solenoid valve for controlling the flow of the fluid is also provided between the condenser 5 and the return tank 105.
Further, the gas inlet port is connected to a nitrogen cylinder 101 through a gas inlet solenoid valve 120, and nitrogen gas is introduced from the nitrogen cylinder 101 into the bottom of the reservoir 109. The air outlet port is connected to the atmosphere through an air release solenoid valve 119, which is a one-way valve and exhausts air from the tank 109 to the outside. The evacuation port is connected to the vacuum pump 104 through the evacuation solenoid valve 122, and the liquid tank 109 is evacuated to a negative pressure by the vacuum pump 104 to discharge residual air. The liquid inlet port is connected to an environmental medium supply source and the dissolved oxygen amount detection unit via a liquid inlet solenoid valve 118.
Further, a liquid supply solenoid valve 108 is provided at one discharge port of the liquid tank 109 to control supply of the environmental medium to the environmental tank 7, and a liquid supply solenoid valve 110 is provided at the other discharge port to control supply of the environmental medium to the dissolved oxygen amount detection unit. Here, the liquid supply solenoid valve 108 and the liquid supply solenoid valve 110 are powered valves for controlling the supply of the ambient medium.
In some preferred embodiments, a solenoid valve 117 for controlling the supply of the ambient medium is provided on the ambient medium supply side, and the solenoid valve 117 is an electromagnetic valve.
In some preferred embodiments, the reflux tank 105 is disposed between the vacuum solenoid valve 122 and the vacuum pump 104, and is used for recovering the ambient medium condensed/cooled by the condenser 5. On the upper side of the return tank 105, a solenoid valve 106 is provided, which is a ball valve for controlling the fluid communication between the return tank and the ambient tank. A drain valve 107 may be provided at the bottom of the return tank 105 for draining the condensed ambient medium.
In some preferred embodiments, the dissolved oxygen detecting unit includes a liquid collector 111, a dissolved oxygen detecting container 114, and a dissolved oxygen meter 116. One side of the liquid collector 111 is connected to a discharge port of the liquid storage tank through a liquid supply solenoid valve 110, and the other side is connected to a dissolved oxygen amount detection container 114, and a balloon 113 for discharging gas remaining in the liquid collector 111 before the initial measurement is further provided on the liquid collector 111. In addition, a drain valve 112 may be provided on the liquid collector 111 for draining the liquid in the liquid collector after the test. The dissolved oxygen meter 116 is installed in the dissolved oxygen detecting container 114, and the dissolved oxygen meter 116 measures the dissolved oxygen of the collected liquid in the dissolved oxygen detecting container 114. The signal output end of the dissolved oxygen meter is connected to the computer control platform 115, and the measured dissolved oxygen amount value is sent to the computer control platform 115, so that the dynamic intelligent monitoring and control of the dissolved oxygen amount are realized.
The dissolved oxygen meter 116 is preferably attached to the dissolved oxygen detecting container 114 by screwing, and a space between the dissolved oxygen meter 116 and the dissolved oxygen detecting container 114 is preferably sealed by a rubber gasket, and particularly preferably a silicone gasket is used. In detecting the dissolved oxygen amount, it is preferable to fill the dissolved oxygen amount detection container 114 with liquid and ensure that the probe of the dissolved oxygen meter is completely immersed in the liquid.
In the fatigue test system for an ultra-long service life environment of the present invention, it is preferable that the joints of the respective constituent members are hermetically connected by rubber gaskets, and it is particularly preferable that the joints are hermetically connected by silicone gaskets, and after the fatigue test is started, the entire system is in a sealed state completely isolated from the atmosphere, thereby preventing oxygen in the air from entering the system.
The components involved in the ultra-long service life environmental fatigue test system, such as the pressure reducing valve 103, the centrifugal pump 2, the flow control valve 3 and the heater 4 of the nitrogen steel cylinder, and the used electromagnetic valves, such as the electromagnetic valve 106, the liquid supply electromagnetic valve 108, the liquid supply electromagnetic valve 110, the screw valve 117, the liquid inlet end electromagnetic valve 118, the emptying electromagnetic valve 119, the air inlet electromagnetic valve 120, the vacuumizing electromagnetic valve 122 and the like, can be automatically opened and closed based on the electric signals fed back by the computer control platform 115, so as to realize complete online intelligent regulation and control.
In some preferred embodiments, the fatigue test device comprises a high-frequency fatigue tester, a tester control cabinet and an environment box 7, wherein the high-frequency fatigue tester comprises: the device comprises a base 15, a plurality of columns vertically arranged and fixed on the base 15, a cross beam 10 arranged at the upper part of the columns, an excitation device 11 arranged on the cross beam 10, a load transmission device 12 connected below the excitation device 11, an upper chuck 9 arranged at the lower end of the load transmission device 12 and a lower chuck 6 arranged on the base 15. The environment box 7 is positioned between the upper chuck 9 and the lower chuck 6 and fixed on the upright column, sample mounting holes for the sample 13 to pass through are arranged on the upper end surface and the lower end surface of the environment box 7, the upper end and the lower end of the sample 13 are respectively connected with the upper chuck 9 and the lower chuck 6, and the sample 13 and the sample mounting holes are in sealing connection through rubber gaskets. The high-frequency fatigue testing machine can also be provided with a thermocouple temperature measuring tube 8 for measuring the temperature of the environment medium in the environment box 7.
By using the fatigue test apparatus having the above-described configuration, the sample can be sealed in the environmental medium, and various fatigue tests under the environmental conditions of the environmental medium can be simulated, and for example, a fatigue test under a low-oxygen saturated wet steam environment, a corrosion fatigue test under a low-oxygen saturated saline water environment, or the like can be performed.
The environment medium used in the ultra-long service life environment fatigue test system can be determined according to the simulated environment working condition, for example, water, preferably deionized water, can be used; solutions with different concentrations can also be used, sodium chloride solutions with different concentrations (for example, 1-5 mass%) can be used when simulating a seawater environment, and the sodium chloride solutions can be heated to different temperatures (for example, 100 ℃) when simulating a high-temperature salt spray environment. Therefore, the ultra-long service life environmental fatigue test system can be suitable for monitoring and controlling low dissolved oxygen under various complicated test conditions. By combining with a high-frequency fatigue testing machine and the like, fatigue data of the material in the actual service environment can be accurately acquired.
In addition, according to the ultra-long service life environmental fatigue test system, the environmental medium in the environmental box can be allocated and replaced according to the test requirements, meanwhile, the temperature of the heater can also be adjusted, the environmental medium with different temperatures in the environmental box can be realized, and the technical support can be provided for the fatigue design and verification of the structure in the corrosion environment.
The dynamic intelligent dissolved oxygen control device dynamically monitors and controls the dissolved oxygen of the environment medium in the liquid storage tank through the computer control platform, when the dissolved oxygen of the environment medium reaches a preset value, the computer control platform sends a signal to start the centrifugal pump to convey the environment medium into the environment tank of the fatigue test testing device, and then the environment medium is cooled through the condenser and then is recycled to the reflux tank. Therefore, dynamic monitoring of dissolved oxygen for a very long time and online closed-loop intelligent control can be realized, monitoring and control precision is high, and dissolved oxygen of an environment medium required by a fatigue test is guaranteed to meet test requirements.
The predetermined value of the dissolved oxygen amount may be a predetermined value of the dissolved oxygen amount of the environmental medium, but is preferably 80% or less of the predetermined value, and more preferably 50% or less of the predetermined value. In order to ensure that the dissolved oxygen amount of the environmental medium at the time of the environmental test is always kept at a predetermined value or less, it is particularly preferable to set the predetermined value to 50% of the predetermined value.
In addition, the ultra-long service life environmental fatigue test system can be connected to any test system with strict requirements on dissolved oxygen amount, is not limited to a fatigue test system, is convenient to install, and has a simple test method and strong operability.
[ ultra-long life environmental fatigue test method ]
The ultra-long life environmental fatigue test method (also simply referred to as "ultra-long life environmental fatigue test method" or "test method") for dynamic intelligent control of dissolved oxygen amount according to the present invention will be described in detail below with reference to fig. 1 to 2.
The test method of the invention is a method for carrying out fatigue test by using the dissolved oxygen dynamic intelligent control ultra-long service life environment fatigue test system, and comprises the following steps:
the first step is as follows: opening corresponding electromagnetic valves (106, 108, 110, 118, 122) to enable a first loop formed by the liquid storage tank 109, the centrifugal pump 2, the heater 4, the environment tank 7, the condenser 5 and the reflux tank 105 and a second loop formed by the liquid storage tank 109, the nitrogen steel bottle 101, the vacuum pump 104 and the dissolved oxygen detection unit to be completely communicated, starting the vacuum pump 104 to exhaust residual air in the test system, automatically closing the vacuum pump 104 and the first loop after the pressure is reduced to an ideal value (for example, 0-0.1 MPa), opening the screw valve 117 and the liquid inlet end electromagnetic valve 118 at the liquid inlet port of the liquid storage tank 109 to inject environment media into the liquid storage tank 109 to the ideal liquid level, preferably filling the liquid storage tank 109 with the environment media, and then closing the screw valve 117.
The second step is that: opening a pressure reducing valve 103 of the nitrogen steel cylinder 101, adjusting the pressure to an ideal value, opening an air inlet port and an air outlet port of the liquid storage tank 109, and keeping the air pressure in the test system between 0.2 and 0.4MPa by adjusting an air inlet electromagnetic valve 120 arranged at the air inlet port and an air release electromagnetic valve 119 arranged at the air outlet port so as to continuously remove oxygen in the environment medium.
The third step: opening a liquid supply electromagnetic valve 110 at a discharge port of the liquid storage tank 109 connected with the dissolved oxygen detection unit, enabling the environmental medium to enter a liquid collector 111 of the dissolved oxygen detection unit, and simultaneously squeezing a balloon 113, so that the dissolved oxygen detection container 114 is filled with the environmental medium.
The fourth step: starting an oxygen dissolving instrument 116, dynamically monitoring the dissolved oxygen amount of the environmental medium in the dissolved oxygen amount detection container 114, sending detection data to a computer control platform 115 by the oxygen dissolving instrument 114, and entering a fifth step after the dissolved oxygen amount is stable when the dissolved oxygen amount of the environmental medium is below 50% of a specified value; when the dissolved oxygen amount of the environment medium is greater than 50% of the specified value, the environment medium flows into the liquid storage tank 109, the pressure of the liquid storage tank can be automatically adjusted, and nitrogen is continuously introduced to remove oxygen until the dissolved oxygen amount of the environment medium reaches less than 50% of the specified value; the dissolved oxygen in the system is continuously monitored and recorded by the computer control platform 115, and the value of the dissolved oxygen may be measured at regular time intervals, for example, the time intervals may be set to 1 to 30 minutes, preferably 5 to 20 minutes, for example, 1 minute, 5 minutes, 10 minutes, 15 minutes, 20 minutes, and the like.
The fifth step: the pressure reducing valve 103 of the nitrogen cylinder 101 is automatically closed, and then the liquid feed solenoid valve 108 connected to the discharge port of the liquid storage tank 109 in the first circuit is automatically opened, so that the environment medium having a dissolved oxygen amount of 50% or less of a predetermined value is fed into the environment tank 7 by the centrifugal pump 2.
And a sixth step: after the environment medium in the environment box 7 is stabilized, setting fatigue test parameters through a tester control cabinet 16 connected with a high-frequency fatigue tester, and starting the high-frequency fatigue tester; in order to stabilize the environment medium in the environment box 7, the environment medium is preferably continuously supplied into the environment box for 10-30 minutes, and after the value of the thermocouple temperature measuring tube is stable and the sample is uniformly heated, a fatigue test is started.
The seventh step: after the fatigue test is started, if the dissolved oxygen in the test system is greater than 50% of the specified value, the first loop is continuously opened, the pressure reducing valve 103 of the nitrogen gas cylinder 101 in the second loop is automatically opened, nitrogen gas is introduced into the liquid storage tank 109, the pressure of the liquid storage tank 109 is automatically adjusted to remove oxygen, and when the dissolved oxygen of the environmental medium is less than 50% of the specified value, the pressure reducing valve 103 of the nitrogen gas cylinder 101 is automatically closed. Therefore, the dissolved oxygen of the environmental medium in the test system can be monitored in real time, and the dissolved oxygen of the environmental medium can be adjusted in real time, so that the dissolved oxygen of the environmental medium in the test system can always meet the test requirement.
In some preferred embodiments, in the fifth step, the environment medium is heated to a predetermined temperature or heated to form steam by a heater provided between the centrifugal pump and the environment tank, and the heated environment medium or the steam thereof is supplied to the environment tank. Therefore, the environment media with different temperatures in the environment box can be realized, and the technical support can be provided for fatigue design and verification of the structure in a corrosion environment.
The fatigue test method for the ultra-long service life environment preferably further comprises the eighth step of: and acquiring test data from a computer connected with the fatigue testing machine control cabinet, and drawing a fatigue S-N curve.
The ultra-long service life environmental fatigue test method can realize ultra-long time dissolved oxygen dynamic monitoring and online closed loop intelligent control, has high monitoring and control precision, ensures that the dissolved oxygen of the environmental medium required by the fatigue test meets the test requirement, and has simple test method and strong operability.
Examples
The features and advantageous effects of the present invention will be further described below with reference to specific examples. It should be understood that this example is illustrative only and is not intended to limit the scope of the present invention.
In order to test the high-temperature environment fatigue performance of the steam turbine last-stage blade material, a steam supply device needs to be built to simulate the real blade working condition, and the structure diagram of the test system is shown in attached figures 1 and 2. The embodiment is implemented by taking a 15Cr precipitation hardening stainless steel material as a turbine blade material, the service environment of the stainless steel material is low-oxygen saturated wet steam at 100 ℃, the dissolved oxygen is required to be lower than 0.8mg/l, namely, the specified value of the dissolved oxygen is 0.8 mg/l. The following is a method of performing a high frequency fatigue test in a low oxygen saturated wet steam environment at 100 ℃ using the test system of the present invention. Deionized water was used as the ambient medium in this example.
Firstly, the electromagnetic valve 106, the liquid supply electromagnetic valve 108, the liquid supply electromagnetic valve 110, the liquid inlet end electromagnetic valve 118 and the vacuumizing electromagnetic valve 122 are opened, so that a first loop formed by the liquid storage tank 109, the centrifugal pump 2, the heater 4, the environment tank 7, the condenser 5 and the return tank 105 and a second loop formed by the liquid storage tank 109, the nitrogen steel cylinder 101, the vacuum pump 104 and the dissolved oxygen amount detection unit are completely communicated, the vacuum pump 104 is started to exhaust residual air in the test system, when the pressure is reduced to be below 0MPa, the vacuum pump 104, the electromagnetic valve 106 and the liquid supply electromagnetic valve 108 are automatically closed, meanwhile, the screw valve 117 is opened and the liquid inlet end electromagnetic valve 118 is opened to inject deionized water into the liquid storage tank 109, so that the liquid storage tank 109 is filled with the.
Then, the pressure reducing valve 103 of the nitrogen cylinder 101 is opened, the pressure is adjusted to an ideal value, the gas inlet port and the gas outlet port of the liquid storage tank 109 are opened, the gas pressure in the test system is maintained between 0.2 MPa and 0.4MPa by adjusting the gas inlet electromagnetic valve 120 and the air release electromagnetic valve 119, and oxygen in the deionized water is continuously removed.
Next, the liquid supply solenoid valve 110 is opened to allow the deionized water to enter the liquid collector 111, and the balloon 113 is pressed, so that the dissolved oxygen amount detection container 114 is filled with the deionized water.
Then, starting the dissolved oxygen meter 116, dynamically monitoring the dissolved oxygen of the deionized water in the dissolved oxygen detection container 114, measuring the dissolved oxygen value every 10 minutes, sending detection data to the computer control platform 115 by the dissolved oxygen meter 114, and entering the next step after the dissolved oxygen is stabilized when the dissolved oxygen of the deionized water is below 0.4 mg/l; when the dissolved oxygen of the deionized water is more than 0.4mg/l, the deionized water flows into the liquid storage tank 109, the pressure of the liquid storage tank can be automatically adjusted, and the nitrogen is continuously introduced for deoxygenation until the dissolved oxygen of the deionized water reaches below 0.4 mg/l.
Then, when the dissolved oxygen amount of deionized water is less than 0.4mg/l, the pressure reducing valve 103 of the nitrogen gas cylinder 101 is automatically closed, and then the liquid supply solenoid valve 108 is automatically opened, and deionized water having a dissolved oxygen amount of less than 0.4mg/l is supplied to the atmosphere tank 7 by the centrifugal pump 2. The deionized water is heated to 100 c by the heater 4 to form wet steam before entering the environmental chamber 7.
And continuously supplying the wet steam of the deionized water into the environment box 7 for about 30 minutes, setting fatigue test parameters through the test machine control cabinet 16 after the wet steam environment is stable, and starting a high-frequency fatigue test machine to perform a fatigue test.
Then, after the fatigue test is started, if the dissolved oxygen in the test system is more than 0.4mg/l, the first loop is continuously opened, the pressure reducing valve 103 of the nitrogen steel cylinder 101 in the second loop is automatically opened, nitrogen is introduced into the liquid storage tank 109, the pressure of the liquid storage tank 109 is automatically adjusted to remove oxygen, and when the dissolved oxygen of deionized water is less than 0.4mg/l, the pressure reducing valve 103 of the nitrogen steel cylinder 101 is automatically closed.
The results of monitoring the dissolved oxygen for the high frequency fatigue test performed in the low oxygen saturated wet steam environment at 100 ℃ using the test system of the present invention in this example are shown in fig. 3. As can be seen from FIG. 3, after the fatigue testing machine is started, the dissolved oxygen in the whole testing system is accurately controlled to be about 0.4mg/l and not to exceed 0.8mg/l, and the reliability of the fatigue testing data is strictly ensured.
Environmental fatigue test data is obtained from a computer connected with a control cabinet of the testing machine, and a fatigue S-N curve (corresponding cycle failure times under different stress levels) is drawn, as shown in the attached figure 4. The whole test process is that a stress value lower than the specified yield limit of the sample material is applied to the sample every time, so as to obtain the cycle failure frequency of the sample. In fig. 4, R is a stress ratio (a ratio of a minimum load to a maximum load when the sample is cyclically loaded), and R is 0.7, that is, the maximum and minimum loads loaded to the sample by the fatigue test are tensile stresses; the normalized parameter is the ratio of the value of the stress applied to the specimen to the specified yield limit of the specimen material. As can be seen from FIG. 4, by usingThe test system can be used for performing the test under the low-oxygen saturated wet steam environment at 100 ℃ by 108And long-time fatigue test of cycle number (168 hours), thereby providing accurate ultra-long life environmental fatigue test data.
The test system of the present invention is not limited to a corrosive media environmental fatigue test. If the environment box is not steam, other corrosive solution (such as saline water) is replaced, and the corrosive medium environment fatigue test can be still completed. The design concept and connection mode of the specific embodiment are basically consistent with the low oxygen saturated wet steam.
Finally, it should be understood that the above description of the embodiments is illustrative in all respects, and not restrictive, and that various modifications may be made without departing from the spirit of the invention. The scope of the invention is indicated by the claims rather than by the foregoing description of embodiments or examples. The scope of the present invention includes all modifications within the meaning and range equivalent to the claims.
Industrial applicability of the invention
The ultra-long-life environmental fatigue test system with the dynamic intelligent dissolved oxygen control can realize ultra-long-time dynamic dissolved oxygen monitoring and online closed-loop intelligent control, has high monitoring and control precision, ensures that the dissolved oxygen of an environmental medium required by a fatigue test meets the test requirement, has simple test method and strong operability, can be used for low-dissolved oxygen long-life fatigue tests of materials or structures under various test conditions, and provides technical support for fatigue design and verification of the structures.
Claims (10)
1. An ultra-long-life environmental fatigue test system with dynamic intelligent control of dissolved oxygen amount comprises: a dynamic intelligent control device for dissolved oxygen, a fatigue test testing device, a supply path for supplying an environmental medium to the fatigue test testing device, and a recovery path for recovering the environmental medium,
the dynamic intelligent dissolved oxygen control device comprises a liquid storage tank, a nitrogen steel cylinder, a vacuum pump, a pressure gauge, a reflux tank, a dissolved oxygen detection unit, an electromagnetic valve and a computer control platform,
the fatigue test device comprises a high-frequency fatigue tester, a tester control cabinet and an environment box,
the inlet of the environment tank is connected with the liquid supply port of the liquid storage tank through the supply path, the outlet of the environment tank is connected with the reflux groove through the recovery path,
a centrifugal pump and a heater are provided in the supply path, a condenser is provided in the recovery path,
the dynamic intelligent dissolved oxygen control device dynamically monitors and controls the dissolved oxygen of an environment medium in the liquid storage tank through the computer control platform, when the dissolved oxygen of the environment medium reaches a preset value, the centrifugal pump is started to convey the environment medium to the fatigue test testing device in the environment tank, and then the environment medium is cooled by the condenser and then is recovered to the reflux tank.
2. The ultra-long-life environmental fatigue test system for dynamic intelligent control of dissolved oxygen amount of claim 1,
be equipped with inlet port, the port of giving vent to anger, evacuation port and the manometer on the case lid of liquid reserve tank, be equipped with the feed liquor port in the side portion of going up of liquid reserve tank, be equipped with the discharge port that supplies with the environment medium to dissolved oxygen volume detecting element in the bottom of liquid reserve tank and to the discharge port that the environment medium was supplied with to the environment case, be equipped with the solenoid valve that is used for controlling the fluid flow in each port department,
and an electromagnetic valve for controlling the fluid flow is arranged between the condenser and the reflux groove.
3. The ultra-long-life environmental fatigue test system for dynamic intelligent control of dissolved oxygen amount as claimed in claim 2,
the gas inlet port is connected to the nitrogen steel cylinder through a gas inlet electromagnetic valve, nitrogen is introduced from the nitrogen steel cylinder to the bottom of the liquid storage tank,
the air outlet port is connected to the atmosphere through an emptying electromagnetic valve which is a one-way valve and used for exhausting air from the liquid storage tank to the outside,
the vacuumizing port is connected to the vacuum pump through a vacuumizing electromagnetic valve, the vacuum pump is used for vacuumizing the liquid storage box to negative pressure, and residual air is discharged.
The liquid inlet port is connected with an environment medium supply source and the dissolved oxygen amount detection unit.
4. The ultra-long-life environmental fatigue test system for dynamic intelligent control of dissolved oxygen amount according to claim 1 or 2,
the dissolved oxygen detecting unit comprises a liquid collector, a dissolved oxygen detecting container and a dissolved oxygen instrument,
one side of the liquid collector is connected to one discharge port of the liquid storage tank, the other side of the liquid collector is connected to the dissolved oxygen detection container, a balloon is further arranged on the liquid collector and used for discharging residual gas in the solution collector before primary measurement,
the dissolved oxygen meter is arranged in the dissolved oxygen detection container, the dissolved oxygen meter measures the dissolved oxygen of the collected liquid in the dissolved oxygen detection container,
the signal output end of the dissolved oxygen meter is connected to the computer control platform, and the measured dissolved oxygen quantity value is sent to the computer control platform, so that the dynamic monitoring and intelligent control of the dissolved oxygen quantity are realized.
5. The ultra-long-life environmental fatigue test system for dynamic intelligent control of dissolved oxygen amount of claim 4,
the dissolved oxygen meter is arranged in the dissolved oxygen amount detection container in a threaded connection mode, and the dissolved oxygen meter and the dissolved oxygen amount detection container are sealed through a rubber gasket;
and when the dissolved oxygen amount is detected, filling the dissolved oxygen amount detection container with liquid, and ensuring that a probe of the dissolved oxygen meter is completely immersed in the liquid.
6. The ultra-long-life environmental fatigue test system for dynamic intelligent control of dissolved oxygen amount of claim 4,
the joints in the ultra-long service life environmental fatigue test system are hermetically connected by rubber gaskets, and after the fatigue test is started, the whole system is in a sealing state completely isolated from the atmosphere.
7. The ultra-long-life environmental fatigue test system for dynamic intelligent control of dissolved oxygen amount of claim 1,
the high-frequency fatigue testing machine comprises: the device comprises a base, a plurality of upright posts vertically arranged and fixed on the base, a cross beam arranged at the upper parts of the upright posts, an excitation device arranged on the cross beam, a load transfer device connected below the excitation device, an upper chuck arranged at the lower end of the load transfer device and a lower chuck arranged on the base,
the environment box is located between the upper chuck and the lower chuck and fixed on the upright column, sample mounting holes for a sample to pass through are formed in the upper end face and the lower end face of the environment box, the upper end face and the lower end face of the sample are respectively connected with the upper chuck and the lower chuck, and the sample mounting holes are connected in a sealing mode through rubber gaskets.
8. An ultra-long-life environmental fatigue test method for dynamic intelligent control of dissolved oxygen, which is a method for carrying out fatigue test by using the ultra-long-life environmental fatigue test system for dynamic intelligent control of dissolved oxygen according to any one of claims 1 to 7, and comprises the following steps:
the first step is as follows: opening a corresponding electromagnetic valve to enable a first loop formed by a liquid storage tank, a centrifugal pump, a heater, an environment tank, a condenser and a reflux tank and a second loop formed by the liquid storage tank, a nitrogen steel cylinder, a vacuum pump and a dissolved oxygen detection unit to be completely communicated, starting the vacuum pump to exhaust residual air in a test system, automatically closing the vacuum pump and the first loop after the pressure is reduced to an ideal value, and opening the electromagnetic valve at a liquid inlet port of the liquid storage tank to inject an environment medium into the liquid storage tank to the ideal liquid level;
the second step is that: opening a pressure reducing valve of the nitrogen steel cylinder, adjusting the pressure to an ideal value, opening an air inlet port and an air outlet port of the liquid storage tank, and keeping the air pressure in the test system balanced by adjusting an air inlet electromagnetic valve arranged at the air inlet port and an air discharge electromagnetic valve arranged at the air outlet port;
the third step: opening an electromagnetic valve at a discharge port of the liquid storage tank connected with the dissolved oxygen detection unit to enable an environmental medium to enter a liquid collector of the dissolved oxygen detection unit, and simultaneously squeezing the balloon to enable the dissolved oxygen detection container to be filled with the environmental medium;
the fourth step: starting the dissolved oxygen meter, dynamically monitoring the dissolved oxygen of the environment medium in the dissolved oxygen detection container, sending detection data to a computer control platform by the dissolved oxygen meter, and entering a fifth step after the dissolved oxygen is stable when the dissolved oxygen of the environment medium is below 50% of a specified value; when the dissolved oxygen amount of the environment medium is greater than 50% of the specified value, the environment medium flows into the liquid storage tank, the pressure of the liquid storage tank can be automatically adjusted, and nitrogen is continuously introduced to remove oxygen until the dissolved oxygen amount of the environment medium reaches less than 50% of the specified value;
the fifth step: the pressure reducing valve of the nitrogen steel cylinder is automatically closed, then the electromagnetic valve connected with the discharge port of the liquid storage tank in the first loop is automatically opened, and the centrifugal pump is started to convey the environment medium with the dissolved oxygen of less than 50% of the specified value into the environment tank;
and a sixth step: after the environment medium in the environment box is stable, setting fatigue test parameters through a test machine control cabinet connected with a high-frequency fatigue test machine, and starting the high-frequency fatigue test machine;
the seventh step: after fatigue test begins, if the dissolved oxygen volume in the test system is greater than 50% of specified value, then first return circuit continues to open, and the relief pressure valve of nitrogen gas steel bottle is automatic to be opened in the second return circuit simultaneously, to let in nitrogen gas in the liquid storage tank, the pressure of this liquid storage tank can automatically regulated, carries out the deoxidization, when the dissolved oxygen volume of environmental medium reaches below 50% of specified value, the relief pressure valve self-closing of nitrogen gas steel bottle.
9. The ultra-long-life environmental fatigue test method for dynamic intelligent control of dissolved oxygen in claim 8,
in the fifth step, the environment medium is heated to a prescribed temperature or heated to form steam by a heater provided between the centrifugal pump and the environment tank, and the heated environment medium or the steam thereof is supplied to the environment tank.
10. The ultra-long-life environmental fatigue test method for dynamic intelligent control of dissolved oxygen amount according to claim 8, further comprising an eighth step of: and acquiring test data from a computer connected with the fatigue testing machine control cabinet, and drawing a fatigue S-N curve.
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