CN111610090A - Pressure cycle test system and method for gas container - Google Patents
Pressure cycle test system and method for gas container Download PDFInfo
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- CN111610090A CN111610090A CN202010316363.1A CN202010316363A CN111610090A CN 111610090 A CN111610090 A CN 111610090A CN 202010316363 A CN202010316363 A CN 202010316363A CN 111610090 A CN111610090 A CN 111610090A
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
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- 238000010998 test method Methods 0.000 claims abstract description 9
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- 230000001105 regulatory effect Effects 0.000 claims description 26
- 239000000523 sample Substances 0.000 claims description 17
- 230000007613 environmental effect Effects 0.000 claims description 16
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
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- 238000012795 verification Methods 0.000 abstract description 2
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- 238000004364 calculation method Methods 0.000 description 2
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- 238000009661 fatigue test Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012611 container material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3263—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers using a differential pressure detector
Abstract
The invention discloses a pressure cycle test system and a test method of a gas container, comprising a hydraulic loading unit and a medium filling unit; placing a gas container, namely a container to be tested, in a quick-open environment container; injecting a gas medium into the container to be tested by using a medium filling unit, so that the internal pressure of the container to be tested reaches an internal upper limit value P1 and is kept unchanged; injecting a circulating medium into the quick-opening environment container by using the hydraulic loading unit, and circularly changing the internal pressure of the quick-opening environment container to circularly change the external pressure of the container to be tested, wherein the upper limit value of the external pressure of the container to be tested is P2; and carrying out pressure cycle test on the container to be tested through the cycle change of the internal and external pressure difference of the container to be tested. The invention realizes the cycle life verification of the gas container in simple, rapid, safe, multi-working condition and fitting practical conditions.
Description
Technical Field
The invention relates to the technical field of cycle life test of pressure-bearing equipment, in particular to a pressure cycle test system and a pressure cycle test method for a gas container.
Background
Pressure vessels are widely used in petrochemical, aerospace, electronics and new energy industries, and many of them are loaded with gas media and have pressure cycle fluctuation working conditions. Although the overall stress level of the pressure container is far lower than the yield strength under the action of cyclic load, cracks can be generated on the inner wall of the pressure container along with the action of the cyclic load, the cracks gradually expand along with the pressure cycle, and the instability expansion can be generated when the toughness of the pressure container is reduced, so that the pressure container usually generates sudden damage without obvious plastic deformation, and therefore the damage of the pressure container is difficult to prevent and has serious consequences. Considering that the compressibility of the gas medium is strong, the energy release process is longer than the time of the liquid medium after the container loses efficacy due to the cyclic load, and the influence caused by the invalidation is more huge.
Particularly for the container without large opening, which has a narrow internal space and is difficult to cover by the conventional inspection means, the inner wall of the container inevitably has some defects, wherein the crack defects are more easily damaged under the action of cyclic load.
The damage mode of a container loaded with some special gases is complex, multiple damage mechanism interaction exists, effective evaluation is difficult to carry out through pure theoretical analysis in the design stage, and even if evaluation is carried out, the evaluation result is verified through a fatigue test, namely a pressure cycle test.
Currently, the main test modes for special gas medium containers and the problems include:
firstly, compatibility tests are directly carried out by using materials and special gas media used by the container, but for the whole container, the stress state of the container is complex, and data obtained by the material tests are difficult to directly extrapolate for guiding the whole container design.
Secondly, through the high-pressure pump device to the container injection inert hydraulic medium of placing in the atmosphere produce pressure cycle fluctuation, can realize the fatigue test under the pure stress change condition, but can't simulate the interact of special gaseous medium and the used material of container, in addition, this kind of test mode is only applicable to liquid medium, when test medium is gaseous, can be because the compressibility of gas with be difficult to retrieve and cause test system's structure very complicated, when container pressure is higher, when the volume is great, will cause whole test device's cost and power consumption very big, simultaneously, because the quick step-up and step-down of gaseous difficult realization, make test period very long, be unfavorable for developing of the simulation test that the number of times of fatigue is more.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a pressure cycle test system and a pressure cycle test method for a gas container, which realize the cycle life verification of the gas medium container on the practical conditions of simplicity, rapidness, safety, multiple working conditions and fitting.
In order to achieve the purpose, the invention adopts the following technical scheme that:
a pressure cycling test system for gas containers, comprising: the hydraulic loading unit and the medium filling unit;
the hydraulic loading unit includes: the system comprises a circulating medium storage tank, a quick-opening environment container, a liquid pressurization pipeline and a pressure control bypass;
the circulating medium storage tank is used for storing circulating medium;
the quick-opening environment container is used for placing a gas medium container to be subjected to pressure cycle test, namely a container to be tested;
the liquid pressurization pipeline is used for connecting the circulating medium storage tank and the quick-opening environment container, and circulating medium in the circulating medium storage tank flows into the quick-opening environment container along the liquid pressurization pipeline;
the liquid pressure charging pipeline is sequentially provided with the following components in the direction from the circulating medium storage tank to the quick-opening environment container: high-pressure pump units, check valves; namely, the input end of the high-pressure pump unit is connected with the circulating medium storage tank, the output end of the high-pressure pump unit is connected with the input end of the one-way valve, and the output end of the one-way valve is connected with the quick-opening environment container;
one end of the pressure control bypass is connected with the liquid pressurization pipeline, and the access point is positioned behind the output end of the one-way valve; the other end of the pressure control bypass is connected with a circulating medium storage tank; the pressure control bypass is provided with a regulating valve; the regulating valve is used for controlling the internal pressure of the quick-opening environment container; the opening of the regulating valve is controlled, the flow resistance change of the regulating valve is utilized to regulate the internal pressure of the quick-opening environment container, various change curves of the internal pressure of the quick-opening environment container and upper and lower limit pressure maintaining of the internal pressure of the quick-opening environment container are realized, and when the quick-opening environment container needs to be decompressed, the opening of the regulating valve is increased; when the quick-opening environment container needs to be pressurized, the opening degree of the regulating valve is reduced;
the medium filling unit includes: the device comprises a medium bottle group, a gas pressurization pipeline and a connecting hose;
the medium bottle group is used for storing a gas medium;
one end of the gas pressurization pipeline is connected with the medium bottle group, and the other end of the gas pressurization pipeline is connected with one end of the connecting hose; the other end of the connecting pipeline is connected with a container to be tested which is placed in the quick-opening environment container; the gas medium in the medium bottle group is injected into the container to be tested along the gas pressurization pipeline and the connecting hose;
the direction from the medium bottle group to the connecting hose is arranged on the gas pressurizing pipeline in sequence: the device comprises a first electromagnetic valve, a gas booster set, a second electromagnetic valve, a cutting device and a sealing joint; the gas pressurization pipeline is connected with the connecting hose through a sealing joint; the first electromagnetic valve and the second electromagnetic valve are used for controlling the flow of the gas medium in the gas pressurization pipeline; the gas booster set is used for boosting a gas medium; the cutting device is used for cutting off the gas pressurization pipeline, namely cutting off the injection of the gas medium into the container to be tested.
The test system further comprises a media recovery unit;
the medium recovery unit includes: a gas recovery line; the gas recovery line includes: a first gas recovery pipeline and a second gas recovery pipeline;
one end of the first gas recovery pipeline is connected with the gas pressurization pipeline, and the access point is positioned between the second electromagnetic valve and the cutting device; the other end of the first gas recovery pipeline is connected with the medium bottle group; a third electromagnetic valve is arranged on the first gas recovery pipeline; the third electromagnetic valve is used for controlling the flow of the gas medium in the first gas recovery pipeline;
one end of the second gas recovery pipeline is connected with the gas pressurization pipeline, and the access point is positioned between the second electromagnetic valve and the cutting device; the other end of the second gas recovery pipeline is connected with the medium bottle group; and the second gas recovery pipeline flows through the gas booster set;
the direction of following gas pressure boost pipeline to medium bottle group on the second gas recovery pipeline is equipped with in proper order: a fourth electromagnetic valve and a fifth electromagnetic valve; the input end of the fourth electromagnetic valve is connected with the gas pressurization pipeline, the access point is positioned between the second electromagnetic valve and the cutting device, the output end of the fourth electromagnetic valve is connected with the input end of the gas pressurization unit, the output end of the gas pressurization unit is connected with the input end of the fifth electromagnetic valve, and the output end of the fifth electromagnetic valve is connected with the medium bottle group; the fourth electromagnetic valve and the fifth electromagnetic valve are used for controlling the flow of the gas medium in the second gas recovery pipeline.
A heat exchanger is also arranged on the liquid pressurization pipeline; the heat exchanger is positioned between the one-way valve and the quick-opening environment container; a cooler is also arranged on the pressure control bypass; the cooler is located between the regulating valve and the circulating medium tank.
The test system also comprises a circulating water unit;
the heat exchanger and the cooler are both connected with a circulating water unit, and the circulating water unit is used for providing a heat source and a cold source for the heat exchanger and the cooler.
The hydraulic loading unit further includes: an overflow circuit;
one end of the overflow loop is connected with the liquid pressurization pipeline, and the access point is positioned behind the output end of the one-way valve; the other end of the overflow loop is connected with a circulating medium storage tank; an overflow valve is arranged on the overflow loop; the overflow valve is set with a pressure threshold value, when the pressure of the circulating medium on the liquid pressurization pipeline after being pressurized by the high-pressure pump unit exceeds the pressure threshold value set by the overflow valve, the overflow valve is opened, and the circulating medium flows back to a part of the circulating medium storage tank from the overflow loop.
The test system further comprises a control unit;
the control unit includes: the computer is respectively connected with the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the temperature transmitter and the gas leakage alarm instrument, and the first gas leakage probe and the second gas leakage probe are respectively connected with the gas leakage alarm instrument;
the first pressure transmitter is connected to the liquid pressurization pipeline, and the access point is positioned in front of the input end of the quick-opening environment container and used for acquiring the input pressure of the quick-opening environment container and transmitting the acquired input pressure of the quick-opening environment container to the computer;
the second pressure transmitter is connected to the liquid pressurization pipeline I, and the access point is positioned between the output end of the high-pressure pump unit and the input end of the one-way valve and is used for acquiring the output pressure of the high-pressure pump unit and transmitting the acquired output pressure of the high-pressure pump unit to the computer;
the third pressure transmitter is connected to the gas pressurization pipeline II, and the access point is positioned behind the output end of the cutting device and is used for acquiring the input pressure of the container to be tested and sending the acquired input pressure of the container to be tested to the computer;
the temperature transmitter is connected to the outer wall of the quick-opening environment container and used for acquiring the temperature of the quick-opening environment container and sending the acquired temperature of the quick-opening environment container to the computer
The first gas leakage probe is connected in the quick-opening environment container and used for collecting the content of a gas medium in the quick-opening environment container and sending the collected content of the gas medium in the quick-opening environment container to the gas leakage alarm instrument;
the second gas leakage probe is connected in the circulating medium storage tank and used for collecting the content of the gas medium in the circulating medium storage tank and sending the collected content of the gas medium in the circulating medium storage tank to the gas leakage alarm instrument;
the gas leakage alarm instrument sends the received gas medium content in the quick-opening environment container and the received gas medium content in the circulating medium storage tank to a computer, judges the gas medium content in the quick-opening environment container and the gas medium content in the circulating medium storage tank respectively, and alarms gas leakage if the gas medium content in the quick-opening environment container and the gas medium content in the circulating medium storage tank exceed set thresholds;
and the computer is respectively connected with each valve in the test system and respectively controls each valve in the test system.
The outer wall of the quick-opening environment container is provided with a heat insulation layer for ensuring the stable environment temperature of the quick-opening environment container in the test process; and the circulating medium in the circulating medium storage tank is inert medium.
After the pressure cycle test is finished, the gas medium in the container to be tested is recovered, and the method comprises the following steps:
when the pressure in the container to be tested is higher than the pressure in the medium bottle group, the gas booster set, the first electromagnetic valve, the second electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve are closed, the third electromagnetic valve is opened, and the gas medium in the container to be tested naturally flows back to the medium bottle group from the first gas recovery pipeline; after the natural reflux is finished, closing the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve, opening the gas booster set, the fourth electromagnetic valve and the fifth electromagnetic valve, and recovering the gas medium in the container to be tested from the second gas recovery pipeline to the medium bottle set;
when the pressure in the container to be tested is not higher than the pressure in the medium bottle group, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are directly closed, the gas booster set, the fourth electromagnetic valve and the fifth electromagnetic valve are opened, and the gas medium in the container to be tested is recovered to the medium bottle group from the second gas recovery pipeline.
The invention also discloses a pressure cycle test method of the gas container,
placing a gas medium container, namely a container to be tested, in a quick-opening environment container;
injecting a gas medium into the container to be tested, so that the internal pressure of the container to be tested reaches an internal upper limit value P1 and keeps unchanged;
injecting a circulating medium into the quick-opening environment container, and circularly changing the internal pressure of the quick-opening environment container to circularly change the external pressure of the container to be tested, wherein the external pressure upper limit value of the container to be tested is P2;
and carrying out pressure cycle test on the container to be tested through the cycle change of the internal and external pressure difference of the container to be tested.
The pressure cycling test of the container to be tested at different environmental temperatures is realized by changing the temperature of the circulating medium in the quick-opening environmental container.
The invention has the advantages that:
(1) the invention can verify the full-size pressure cycle life of the gas medium container, and compared with the prior art in which the pressure cycle test is only carried out on the container material, the extrapolated and calculated container life according to the pressure cycle test result of the invention is closer to the reality.
(2) The test method of the invention comprises the following steps: the internal pressure of the container to be tested is unchanged, the external pressure of the environment to be tested is changed in a circulating mode, namely the pressure of a circulating medium in the container in the quick-opening environment is changed in a circulating mode, and the circulating life of the container is verified in a mode of changing the internal and external pressure difference of the container to be tested in a circulating mode. The test system of the invention has the advantages that the pressure of the circulating medium in the quick-opening environment container can be changed very simply and quickly, the change of the internal pressure of the quick-opening environment container can be realized by controlling the opening of the regulating valve and utilizing the change of the flow resistance, the defects of directly pressurizing and releasing the gas medium to the container to be tested, such as the defects of complex system, certain potential safety hazard, long test time and the like, are avoided, and the whole test is simple, safe and quick. And the calculation is carried out through the Ramei formula, and the pressure fluctuation range required to be changed by utilizing the pressure difference change mode is smaller than that of the direct pressurization mode for realizing the same stress change range of the container wall.
(3) Because some special gases are generally toxic or harmful, the medium recovery unit provided by the invention can reduce the pollution of the gas medium to the environment.
(4) The invention provides various temperature environments for the quick-opening environment container through the heat exchanger, the cooler and the circulating water unit, and realizes the pressure circulation test of the container to be tested at different environmental temperatures.
(5) The overflow circuit of the present invention limits the pressure of the circulating medium on the liquid pressurization line I.
(6) The invention monitors various data in the whole system in real time through the control unit, realizes the unified regulation and control of all valves in the system through the computer, is convenient for data viewing and unified regulation and control, and even realizes the automatic regulation and control of all valves in the system through the computer, for example, the opening of the regulating valve is controlled through the computer, various change curves of the internal pressure of the quick-opening environment container are realized, the upper and lower limit pressure maintaining of the internal pressure of the quick-opening environment container is realized, and the loading of other special pressure waveforms is realized.
(7) The circulating medium storage tank is a closed circulating medium storage tank, gas leakage probes are arranged on the circulating medium storage tank and the top of the quick-opening container, and data acquired by the circulating medium storage tank and the top of the quick-opening container are connected to a gas leakage alarm instrument, so that whether the container to be tested leaks in a micro-scale manner or not is detected.
(8) According to the invention, the container to be tested is placed in the quick-opening environment container, and the quick-opening environment container is filled with the inert medium, so that the energy after blasting can be effectively absorbed after the container to be tested fails due to cyclic load, and the effects of buffering and protecting are achieved.
Drawings
Fig. 1 is a schematic diagram of a pressure cycle testing system and a pressure cycle testing method for a gas container according to the present invention.
Fig. 2 is a flow chart of a pressure cycling test method of a gas container according to the present invention.
Fig. 3 is a schematic diagram of the gaseous medium flowing back from the first gas recovery line IVa to the medium cylinder group according to the present invention.
Fig. 4 is a schematic diagram of the flow of the gaseous medium of the present invention from the second gas recovery line IVb back into the media bottle bank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a pressure cycle test system of a gas container, which comprises: the device comprises a hydraulic loading unit, a medium filling unit, a medium recovery unit, a control unit and a circulating water unit 21;
as shown in fig. 1, the hydraulic loading unit includes: the system comprises a circulating medium storage tank 1, a quick-opening environment container 5, a liquid pressurization pipeline I, an overflow loop VI and a pressure control bypass V. Wherein the content of the first and second substances,
the circulating medium storage tank 1 is used for storing a circulating medium, i.e., an inert liquid medium.
The quick-open environment container 5 is used for placing a gas medium container to be subjected to pressure cycle test, namely a container to be tested 17.
The liquid pressurization pipeline I is used for connecting the circulating medium storage tank 1 and the quick-opening environment container 5, and circulating medium in the circulating medium storage tank 1 flows into the quick-opening environment container 5 along the liquid pressurization pipeline I.
The liquid pressurizing pipeline I is sequentially provided with the following components in the direction from the circulating medium storage tank 1 to the quick-opening environment container 5: the high-pressure pump unit 2, the one-way valve 3 and the heat exchanger 4; namely, the input end of the high-pressure pump unit 2 is connected with the circulating medium storage tank 1, the output end of the high-pressure pump unit 2 is connected with the input end of the check valve 3, the output end of the check valve 3 is connected with the input end of the heat exchanger 4, and the output end of the heat exchanger 4 is connected with the quick-opening environment container 5.
One end of the overflow loop VI is connected with the liquid pressurization pipeline I, the access point is positioned between the output end of the check valve 3 and the input end of the heat exchanger 4, and the other end of the overflow loop VI is connected with the circulating medium storage tank 1.
An overflow valve 10 is arranged on the overflow loop VI, the input end of the overflow valve 10 is connected with the liquid pressurization pipeline I, the access point is positioned between the output end of the check valve 3 and the input end of the heat exchanger 4, and the output end of the overflow valve 10 is connected with the circulating medium storage tank 1. When the pressure of the circulating medium pressurized by the high-pressure pump unit 2 on the liquid pressurization pipeline I exceeds the set pressure threshold of the overflow valve 10, the overflow valve 10 is opened, and the circulating medium flows back to a part of the circulating medium storage tank 1 from the overflow loop VI.
One end of the pressure control bypass V is connected with the liquid pressurization pipeline I, the access point is positioned between the output end of the check valve 3 and the input end of the heat exchanger 4, and the other end of the pressure control bypass V is connected with the circulating medium storage tank 1.
The pressure control bypass V is sequentially provided with the following components in the direction from the circulating medium storage tank 1 to the liquid pressurization pipeline I: a cooler 9 and a regulating valve 8; that is, the input end of the regulating valve 8 is connected with the liquid pressurizing pipeline I, and the access point is located between the output end of the check valve 3 and the input end of the heat exchanger 4, the output end of the regulating valve 8 is connected with the input end of the cooler 9, and the output end of the cooler 9 is connected with the circulating medium storage tank 1. The change of the internal pressure of the quick-opening environment container 5 is realized by controlling the opening of the regulating valve 8 and utilizing the change of the flow resistance, and when the quick-opening environment container 5 needs to be decompressed, the opening of the regulating valve 8 is increased; when the quick-opening environment container 5 needs to be pressurized, the opening degree of the regulating valve 8 is reduced.
As shown in fig. 1, the medium filling unit includes: the device comprises a medium bottle group 11, a gas pressurization pipeline II and a connecting hose III; the medium recovery unit includes: a gas recovery line IV. Wherein the content of the first and second substances,
the medium bottle group 11 is used for storing gas medium.
The input end of the gas pressurization pipeline II is connected with the medium bottle group 11, and the output end of the gas pressurization pipeline II is connected with the connecting hose III; the output end of the connecting pipeline III is connected with a container to be tested 17 placed in the quick-opening environment container 5; the gaseous medium is fed from the medium bottle group 11 via a gas pressurization line II and a connecting hose III into the container 17 to be tested.
The gas pressurizing pipeline II is sequentially provided with the following components in the direction from the medium bottle group 11 to the connecting hose III: the system comprises a first electromagnetic valve 12, a gas booster set 13, a second electromagnetic valve 14, a cutting device 15 and a sealing joint 16; the gas pressurization pipeline II is connected with the connecting hose III through a sealing joint 16.
The gas recovery line IV includes: a first gas recovery pipeline IVa and a second gas recovery pipeline IVb.
One end of the first gas recovery pipeline IVa is connected with the gas pressurization pipeline II, and the access point is positioned between the second electromagnetic valve 14 and the cut-off device 15; the other end of the first gas recovery pipeline IVa is connected with the medium bottle group 11; a third electromagnetic valve 18 is arranged on the first gas recovery pipeline IVa; the input end of the third electromagnetic valve 18 is connected with the gas pressurization pipeline II, the access point is located between the second electromagnetic valve 14 and the cut-off device 15, and the output end of the third electromagnetic valve 18 is connected with the medium bottle group 11.
One end of the second gas recovery pipeline IVb is connected with the gas pressurization pipeline II, and the access point is positioned between the second electromagnetic valve 14 and the cut-off device 15; the other end of the second gas recovery line IVb is connected to the medium bottle group 11.
The second gas recovery line IVb flows through the gas booster set 13; follow gas pressure boost pipeline II and be equipped with in proper order to the direction of medium bottle group 11 on the second gas recovery pipeline IVb: a fourth solenoid valve 19, a fifth solenoid valve 20; the input end of the fourth electromagnetic valve 19 is connected with the gas pressurization pipeline II, the access point is located between the second electromagnetic valve 14 and the cut-off device 15, the output end of the fourth electromagnetic valve 19 is connected with the input end of the gas booster set 13, the output end of the gas booster set 13 is connected with the input end of the fifth electromagnetic valve 20, and the output end of the fifth electromagnetic valve 20 is connected with the medium bottle set 11.
As shown in fig. 1, the circulating water unit 21 is connected to the heat exchanger 4 and the cooler 9, respectively, to provide a heat source or a cold source for the heat exchanger 4 and the cooler 9, and the high-temperature environment and the low-temperature environment in the quick-opening environmental container 5 are realized by heating or cooling the circulating medium, that is, the pressure circulation test of the container to be tested 17 in the high-temperature environment and the low-temperature environment is realized.
As shown in fig. 1, the outer wall of the quick-open environment container 5 is provided with a heat insulating layer 7 for ensuring the stability of the ambient temperature of the quick-open environment container 5 during the test.
As shown in fig. 1, the interior of the quick-open environmental vessel 5 is provided with a movable saddle 6 for placing a vessel 17 to be tested.
As shown in fig. 1, the control unit includes: the computer 22, the first pressure transmitter 23, the second pressure transmitter 26, the third pressure transmitter 29, the temperature transmitter 24, the gas leakage alarm instrument 28 which are respectively connected with the computer 22, and the first gas leakage probe 25 and the second gas leakage probe 27 which are respectively connected with the gas leakage alarm instrument 28.
The first pressure transmitter 23 is connected to the liquid pressurization pipeline I, and an access point is located between the output end of the heat exchanger 4 and the quick-opening environment container 5, and is configured to collect input pressure of the quick-opening environment container 5 and send the collected input pressure of the quick-opening environment container 5 to the computer 22.
The second pressure transmitter 26 is connected to the liquid pressurization pipeline I, and the access point is located between the output end of the high-pressure pump unit 2 and the input end of the check valve 3, and is configured to collect the output pressure of the high-pressure pump unit 2 and send the collected output pressure of the high-pressure pump unit 2 to the computer 22.
The third pressure transmitter 29 is connected to the gas pressurization pipeline II, and an access point is located between the output end of the cutoff device 15 and the sealing joint 16, and is configured to collect the input pressure of the container 17 to be tested, and send the collected input pressure of the container 17 to be tested to the computer 22.
The temperature transmitter 24 is connected to the quick-open environment container 5, and is configured to acquire the temperature of the quick-open environment container 5 and send the acquired temperature of the quick-open environment container 5 to the calculation 22.
The first gas leakage probe 25 is connected to the quick-opening environment container 5 and is used for collecting the content of the gas medium in the quick-opening environment container 5 and sending the collected content of the gas medium in the quick-opening environment container 5 to the gas leakage alarm instrument 28.
The second gas leakage probe 27 is connected in the circulating medium storage tank 1 and is used for collecting the content of the gas medium in the circulating medium storage tank 1 and sending the collected content of the gas medium in the circulating medium storage tank 1 to the gas leakage alarm instrument 28; the circulating medium storage tank 1 is a closed storage tank, a second gas leakage probe 27 and a first gas leakage probe 25 are respectively arranged on the circulating medium storage tank 1 and the top of the quick-opening environmental container 5, and data acquired by the second gas leakage probe and the first gas leakage probe are connected to a gas leakage alarm instrument 28, so that whether the container 7 to be tested has micro leakage or not is detected.
The gas leakage alarm instrument 28 sends the received gas medium content in the quick-open environment container 5 and the received gas medium content in the circulating medium storage tank 1 to the computer 22, respectively judges the gas medium content in the quick-open environment container 5 and the gas medium content in the circulating medium storage tank 1, and alarms gas leakage if the gas medium content in the quick-open environment container 5 and the gas medium content in the circulating medium storage tank 1 exceed set thresholds;
the computer 22 is respectively connected with the control valve 8, the first electromagnetic valve 12, the second electromagnetic valve 14, the third electromagnetic valve 18, the fourth electromagnetic valve 19 and the fifth electromagnetic valve 20, and the opening degrees of the control valve 8, the first electromagnetic valve 12, the second electromagnetic valve 14, the third electromagnetic valve 18, the fourth electromagnetic valve 19 and the fifth electromagnetic valve 20 are controlled through the computer 22.
The opening degree of the regulating valve 8 is controlled through the computer 22, the change of the internal pressure of the quick-opening environmental container 5 is realized by utilizing the change of the flow resistance, various change curves of the internal pressure of the quick-opening environmental container 5 are realized, the upper and lower limit pressure maintaining of the internal pressure of the quick-opening environmental container 5 is realized, the loading of other special pressure waveforms is realized through the computer 22, and the pressure circulation test of the gas medium container, namely the container to be tested 17, is finally realized through simulation.
The opening degrees of the first electromagnetic valve 12, the second electromagnetic valve 14, the third electromagnetic valve 18, the fourth electromagnetic valve 19 and the fifth electromagnetic valve 20, the opening degrees of the gas pressurization pipeline II and the gas recovery pipeline IV are controlled by the computer 22, so that the pressure of the gas medium injected into the container 17 to be tested is controlled, and the recovery of the gas medium in the container 17 to be tested is controlled.
The computer 22 is also connected with the circulating water unit 21, and the computer 22 controls the circulating flow direction of the pipeline in the circulating water unit 21, so as to control the temperature of the circulating water unit 21, further control the temperature of the cold source or the heat source of the heat exchanger 4 and the cooler 9, and further control the temperature of the quick-opening environment container 5.
The pressure cycle test method of the gas container comprises the following steps:
placing a container of gaseous medium, namely a container to be tested 17, in the quick-opening environmental container 5;
injecting a gas medium with the pressure reaching the upper internal limit value P1 into the container to be tested 17 through the gas pressurization pipeline II, so that the internal pressure of the container to be tested 17 reaches the upper internal limit value P1 and keeps unchanged;
circulating medium is injected into the quick-opening environment container 5 through the liquid pressurization pipeline I, the internal pressure of the quick-opening environment container 5 is continuously changed through the pressure control bypass V, so that the external pressure of the container to be tested 17 is continuously changed, and the upper limit value of the external pressure of the container to be tested 17 is P2;
performing pressure cycle test on the container to be tested 17 through the continuous change of the internal and external pressure difference of the container to be tested 17;
the temperature of the circulating medium in the quick-opening environment container 5 is changed through the heat exchanger 4 and the cooler 9, so that the pressure circulation test of the container 17 to be tested at different environment temperatures is realized.
As shown in fig. 2, the operation method of the pressure cycling test system for gas containers according to the present invention specifically includes the following steps:
s1, the container to be tested 17 is placed on the movable saddle 6 in the quick-opening environment container 5, the connecting hose III is used for connecting the interface of the container to be tested 17 and the sealing joint 16 of the gas pressurization pipeline II, and then the quick-opening environment container 5 is closed.
And S2, opening the first electromagnetic valve 12 and the second electromagnetic valve 14 in the medium filling unit and closing the third electromagnetic valve 18, the fourth electromagnetic valve 19 and the fifth electromagnetic valve 20 in the medium recovery unit through the control system of the computer 22, opening the gas booster set 13, and boosting the pressure of the container to be tested 17 to an upper internal pressure limit value P1 through the gas boosting pipeline II.
And S3, closing the regulating valve 8 in the hydraulic loading unit, starting the high-pressure pump unit 2 to fill the circulating medium, namely the inert medium, into the quick-opening environment container 5, and changing the circulating medium to a specified temperature through the heat exchanger 4.
And S4, changing the pressure of the quick-opening environment container 5 by adjusting the opening of the adjusting valve 8, establishing pressure circulation fluctuation in the quick-opening environment container 5, and performing equivalent conversion on the pressure fluctuation value according to the equivalent stress amplitude caused by pressure fluctuation when the container to be tested actually works as a reference.
And S5, after the test is finished, closing the high-pressure pump unit 2, and completely opening the regulating valve 8 to enable the circulating medium in the quick-opening environment container 5 to flow back to the circulating medium storage tank 1.
S6, according to the test content, if the gas medium needs to be recovered, the method comprises the following steps:
s61, when the pressure in the container to be tested 17 is higher than the pressure in the medium bottle group 11, closing the gas booster set 13 and the first, second, fourth, and fifth solenoid valves 12, 14, 19, 20, and opening the third solenoid valve 18, as shown in fig. 3, so that the gas medium naturally flows back from the first gas recycling line IVa to the medium bottle group 11; after the natural reflux is finished, closing the first electromagnetic valve 12, the second electromagnetic valve 14 and the third electromagnetic valve 18, opening the gas booster set 13, the fourth electromagnetic valve 19 and the fifth electromagnetic valve 20, and recovering the gas medium in the container to be tested 17 from the second gas recovery pipeline IVb to the medium bottle set 11 as shown in fig. 4;
s62, when the pressure in the container 17 to be tested is not higher than the pressure in the medium bottle group 11, the first, second, and third solenoid valves 12, 14, and 18 are directly closed, and the gas booster set 13, the fourth, and fifth solenoid valves 19 and 20 are opened, as shown in fig. 4, to recover the gas medium in the container 17 to be tested from the second gas recovery line IVb to the medium bottle group 11.
The invention is not to be considered as limited to the specific embodiments shown and described, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A pressure cycling test system for gas containers, comprising: the hydraulic loading unit and the medium filling unit;
the hydraulic loading unit includes: the system comprises a circulating medium storage tank (1), a quick-opening environment container (5), a liquid pressurization pipeline (I) and a pressure control bypass (V);
the circulating medium storage tank (1) is used for storing circulating medium;
the quick-opening environment container (5) is used for placing a gas container to be subjected to pressure cycle test, namely a container to be tested (17);
the liquid pressurization pipeline (I) is used for connecting the circulating medium storage tank (1) and the quick-opening environment container (5), and circulating medium in the circulating medium storage tank (1) flows into the quick-opening environment container (5) along the liquid pressurization pipeline (I);
the liquid pressurizing pipeline (1) is sequentially provided with the following components in the direction from the circulating medium storage tank (1) to the quick-opening environment container (5): the high-pressure pump unit (2) and the one-way valve (3); namely, the input end of the high-pressure pump unit (2) is connected with the circulating medium storage tank (1), the output end of the high-pressure pump unit (2) is connected with the input end of the one-way valve (3), and the output end of the one-way valve (3) is connected with the quick-opening environment container (5);
one end of the pressure control bypass (V) is connected with the liquid pressurization pipeline (I), and the access point is positioned behind the output end of the one-way valve (3); the other end of the pressure control bypass (V) is connected with a circulating medium storage tank (1); the pressure control bypass (V) is provided with a regulating valve (8); the regulating valve (8) is used for controlling the internal pressure of the quick-opening environment container (5); the opening of the regulating valve (8) is controlled, the flow resistance change of the regulating valve (8) is utilized to regulate the internal pressure of the quick-opening environmental container (5), various change curves of the internal pressure of the quick-opening environmental container (5) and the upper and lower limit pressure maintaining of the internal pressure of the quick-opening environmental container (5) are realized, and when the quick-opening environmental container (5) needs to be decompressed, the opening of the regulating valve (8) is regulated to be larger; when the quick-opening environment container (5) needs to be pressurized, the opening degree of the regulating valve (8) is reduced;
the medium filling unit includes: the device comprises a medium bottle group (11), a gas pressurization pipeline (II) and a connecting hose (III);
the medium bottle group (11) is used for storing a gas medium;
one end of the gas pressurization pipeline (II) is connected with the medium bottle group (11), and the other end of the gas pressurization pipeline (II) is connected with one end of the connecting hose (III); the other end of the connecting pipeline (III) is connected with a container (17) to be tested which is placed in the quick-opening environment container (5); the gas medium in the medium bottle group (11) is injected into a container (17) to be tested along a gas pressurization pipeline (II) and a connecting hose (III);
the gas pressurizing pipeline (II) is sequentially provided with the following components in the direction from the medium bottle group (11) to the connecting hose (III): the device comprises a first electromagnetic valve (12), a gas booster set (13), a second electromagnetic valve (14), a cutting device (15) and a sealing joint (16); the gas pressurization pipeline (II) is connected with the connecting hose (III) through a sealing joint (16); the first solenoid valve (12) and the second solenoid valve (14) are used for controlling the flow of the gas medium in the gas pressurization line (II); the gas booster set (13) is used for boosting a gas medium; the shut-off device (15) is used for shutting off the gas pressurization pipeline (II), namely, the injection of the gas medium to the container (17) to be tested is shut off.
2. The pressure cycling test system for gas containers of claim 1, further comprising a media recovery unit;
the medium recovery unit includes: a gas recovery line (IV); the gas recovery line (IV) comprises: a first gas recovery line (IVa), a second gas recovery line (IVb);
one end of the first gas recovery pipeline (IVa) is connected with the gas pressurization pipeline (II), and the access point is positioned between the second electromagnetic valve (14) and the cut-off device (15); the other end of the first gas recovery pipeline (IVa) is connected with the medium bottle group (11); a third electromagnetic valve (18) is arranged on the first gas recovery pipeline (IVa); the third solenoid valve (18) is used to control the flow of the gaseous medium in the first gas recovery line (IVa);
one end of the second gas recovery pipeline (IVb) is connected with the gas pressurization pipeline (II), and the access point is positioned between the second electromagnetic valve (14) and the cut-off device (15); the other end of the second gas recovery pipeline (IVb) is connected with the medium bottle group (11); and the second gas recovery line (IVb) flows through the gas booster set (13);
the direction from the gas pressurization pipeline (II) to the medium bottle group (11) on the second gas recovery pipeline (IVb) is provided with in sequence: a fourth solenoid valve (19) and a fifth solenoid valve (20); the input end of a fourth electromagnetic valve (19) is connected with the gas pressurization pipeline (II), an access point is positioned between the second electromagnetic valve (14) and the cut-off device (15), the output end of the fourth electromagnetic valve (19) is connected with the input end of the gas booster set (13), the output end of the gas booster set (13) is connected with the input end of a fifth electromagnetic valve (20), and the output end of the fifth electromagnetic valve (20) is connected with the medium bottle set (11); the fourth solenoid valve (19) and the fifth solenoid valve (20) are used to control the flow of the gaseous medium in the second gas recovery line (IVb).
3. The pressure cycle testing system of a gas container according to claim 1, wherein a heat exchanger (4) is further provided on the liquid pressurization pipeline (I); the heat exchanger (4) is positioned between the one-way valve (3) and the quick-opening environment container (5); a cooler (9) is also arranged on the pressure control bypass (V); the cooler (9) is located between the regulating valve (8) and the circulating medium storage tank (1).
4. A pressure cycling test system for gas containers according to claim 3, characterised in that the test system further comprises a water circulating unit (21);
the heat exchanger (4) and the cooler (9) are both connected with a circulating water unit (21), and the circulating water unit (21) is used for providing a heat source and a cold source for the heat exchanger (4) and the cooler (9).
5. The pressure cycling test system for gas containers of claim 1, wherein the hydraulic loading unit further comprises: an overflow circuit (VI);
one end of the overflow loop (VI) is connected with the liquid pressurization pipeline (I), and the access point is positioned behind the output end of the one-way valve (3); the other end of the overflow loop (VI) is connected with a circulating medium storage tank (1); an overflow valve (10) is arranged on the overflow loop (VI); the pressure threshold value is set for the overflow valve (10), when the pressure of the circulating medium on the liquid pressurization pipeline (I) after being pressurized by the high-pressure pump unit (2) exceeds the pressure threshold value set by the overflow valve (10), the overflow valve (10) is opened, and the circulating medium flows back to a part from the overflow loop (VI) to the circulating medium storage tank (1).
6. A pressure cycling test system for gas containers according to any one of claims 1 to 5, characterised in that the test system further comprises a control unit;
the control unit includes: the gas leakage monitoring system comprises a computer (22), a first pressure transmitter (23), a second pressure transmitter (26), a third pressure transmitter (29), a temperature transmitter (24) and a gas leakage alarm instrument (28), wherein the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the temperature transmitter and the gas leakage alarm instrument are respectively connected with the computer (22), and a first gas leakage probe (25) and a second gas leakage probe (27) are respectively connected with the gas leakage alarm instrument (28);
the first pressure transmitter (23) is connected to the liquid pressurization pipeline (I), and the access point is positioned in front of the input end of the quick-opening environment container (5) and used for acquiring the input pressure of the quick-opening environment container (5) and sending the acquired input pressure of the quick-opening environment container (5) to the computer (22);
the second pressure transmitter (26) is connected to the liquid pressurization pipeline I, and the access point is located between the output end of the high-pressure pump unit (2) and the input end of the one-way valve (3) and used for acquiring the output pressure of the high-pressure pump unit (2) and sending the acquired output pressure of the high-pressure pump unit (2) to the computer (22);
the third pressure transmitter (29) is connected to the gas pressurization pipeline II, and an access point is positioned behind the output end of the cutting device (15) and is used for acquiring the input pressure of the container (17) to be tested and sending the acquired input pressure of the container (17) to be tested to the computer (22);
the temperature transmitter (24) is connected to the outer wall of the quick-opening environment container (5) and used for acquiring the temperature of the quick-opening environment container (5) and sending the acquired temperature of the quick-opening environment container (5) to the computer (22);
the first gas leakage probe (25) is connected in the quick-opening environment container (5) and is used for collecting the content of the gas medium in the quick-opening environment container (5) and sending the collected content of the gas medium in the quick-opening environment container (5) to the gas leakage alarm instrument (28);
the second gas leakage probe (27) is connected in the circulating medium storage tank (1) and is used for collecting the content of the gas medium in the circulating medium storage tank (1) and sending the collected content of the gas medium in the circulating medium storage tank (1) to the gas leakage alarm instrument (28);
the gas leakage alarm instrument (28) sends the received gas medium content in the quick-opening environment container (5) and the received gas medium content in the circulating medium storage tank (1) to the computer (22), the gas leakage alarm instrument (28) also judges the gas medium content in the quick-opening environment container (5) and the gas medium content in the circulating medium storage tank (1) respectively, and if the gas medium content in the quick-opening environment container (5) and the gas medium content in the circulating medium storage tank (1) exceed set thresholds, gas leakage alarm is carried out;
the computer (22) is respectively connected with each valve in the test system, and each valve in the test system is respectively controlled through the computer (22).
7. A pressure cycling test system for gas containers, according to claim 1, characterized in that the outer wall of the quick-opening environmental container (5) is provided with a heat insulating layer (7) for ensuring a stable ambient temperature of the quick-opening environmental container (5) during the test; the circulating medium in the circulating medium storage tank (1) is inert medium.
8. A pressure cycle testing system for gas containers according to claim 2, characterized in that the recovery of the gaseous medium inside the container (17) to be tested after the pressure cycle test is completed comprises the following steps:
when the pressure in the container (17) to be tested is higher than the pressure in the medium bottle group (11), the gas booster set (13), the first electromagnetic valve (12), the second electromagnetic valve (14), the fourth electromagnetic valve (19) and the fifth electromagnetic valve (20) are closed, the third electromagnetic valve (18) is opened, and the gas medium in the container (17) to be tested naturally flows back to the medium bottle group (11) from the first gas recovery pipeline (IVa); after the natural reflux is finished, closing the first electromagnetic valve (12), the second electromagnetic valve (14) and the third electromagnetic valve (18), opening the gas booster set (13), the fourth electromagnetic valve (19) and the fifth electromagnetic valve (20), and recovering the gas medium in the container to be tested (17) to the medium bottle set (11) from the second gas recovery pipeline (IVb);
when the pressure in the container (17) to be tested is not higher than the pressure in the medium bottle group (11), the first electromagnetic valve (12), the second electromagnetic valve (14) and the third electromagnetic valve (18) are directly closed, the gas booster set (13), the fourth electromagnetic valve (19) and the fifth electromagnetic valve (20) are opened, and the gas medium in the container (17) to be tested is recovered to the medium bottle group (11) from the second gas recovery pipeline (IVb).
9. A pressure cycle test method for a container loaded with a gaseous medium is characterized in that,
placing a container loaded with a gaseous medium, namely a container to be tested (17), in a quick-opening environment container (5);
injecting a gas medium into the container (17) to be tested, so that the internal pressure of the container (17) to be tested reaches an internal upper limit value P1 and keeps constant;
injecting a circulating medium into the quick-opening environment container (5), and circularly changing the internal pressure of the quick-opening environment container (5) so that the external pressure of the container (17) to be tested is circularly changed, wherein the upper limit value of the external pressure of the container (17) to be tested is P2;
and performing pressure cycle test on the container (17) to be tested through the cycle change of the internal and external pressure difference of the container (17) to be tested.
10. Pressure cycling test method for containers loaded with gaseous media according to claim 9, characterized in that the pressure cycling test of the container (17) to be tested at different ambient temperatures is achieved by varying the temperature of the circulating medium in the quick-opening ambient container (5).
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