CN216144506U - Bellows fatigue test device of simulation operational environment - Google Patents
Bellows fatigue test device of simulation operational environment Download PDFInfo
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- CN216144506U CN216144506U CN202121796720.5U CN202121796720U CN216144506U CN 216144506 U CN216144506 U CN 216144506U CN 202121796720 U CN202121796720 U CN 202121796720U CN 216144506 U CN216144506 U CN 216144506U
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Abstract
A corrugated pipe fatigue test device for simulating an operating environment comprises an outer pipe, an end pipe assembly, a corrugated pipe, a middle pipe, an end pipe base assembly, a first connecting pipe, a second connecting pipe, a middle plate and a pull rod assembly; the end pipe assembly, the corrugated pipe, the middle pipe and the end pipe base assembly enclose a vertical inner cavity with an opening at the upper part, and a first connecting pipe used for introducing a medium B is connected to the vertical inner cavity; the outer side of the outer pipe is wrapped with a heat insulation layer, the end pipe assembly, the corrugated pipe, the middle pipe, the end pipe base assembly and the outer pipe enclose an annular outer cavity positioned on the outer side of the corrugated pipe, and the annular outer cavity is connected with a second connecting pipe used for introducing a medium A; the middle pipe is connected with a middle plate, the middle plate is provided with a through hole, one end of the pull rod assembly extends into the vertical inner cavity and is connected with the middle plate, and the other end of the pull rod assembly is used for being connected with a fatigue testing machine. The device can simulate the multifactor medium aiming at the actual operation environment of the external pressure type corrugated pipe.
Description
Technical Field
The utility model relates to the field of fatigue testing of a corrugated pipe of a pipeline compensation expansion joint, in particular to a corrugated pipe fatigue testing device for simulating an operating environment.
Background
The expansion joint of the corrugated pipe is a pipeline thermal compensation part which is widely applied and used for reducing the temperature and the pressure of a pipeline and ensuring the safety of the pipeline. The compensation effect mainly depends on the expansion deformation of the core element, namely the bellows, on the structure of the bellows, so that the fatigue life of the bellows can determine the service life of the expansion joint device as a whole and even the service life of a pipeline.
According to the existing standard, the fatigue test of the corrugated pipe at the temperature lower than the creep temperature of the material only requires that the corrugated pipe is subjected to a full displacement cycle test at the design pressure, the test temperature is room temperature, the test medium is a single medium without influence, and the corrosion influence of the operation environment is not taken into consideration. However, the pipeline which needs to be subjected to displacement compensation is usually at a high temperature, the environment of the pipeline contains certain corrosion factors, and the corrugated structure can form considerable stress during displacement compensation to reduce the threshold value of corrosion of the corrugated pipe, so that the actual fatigue life of the corrugated pipe is greatly reduced due to corrosion.
Taking the expansion joint for the town heat supply project as an example, the expansion joint is generally an external pressure axial expansion joint, and is characterized by large displacement compensation amount, low cycle frequency and low frequency and complex operation environment in practical application. In actual use, service life is long, and hot water in a pipeline contains chloride ions with certain concentration, especially, a gap for the pipeline to slide needs to be reserved on one side of the corrugated pipe for ensuring normal expansion of the corrugated pipe in the external pressure type corrugated pipe expansion joint, so that corrosive media (rain and snow water, sewage, soil, microorganisms and the like) in the surrounding environment of the pipeline can permeate into the inner side of the corrugated pipe, evaporate and concentrate at high temperature and corrode the inner surface of the corrugated pipe, therefore, the corrugated pipe usually works in an environment containing corrosive components for long-term service, the actual service life is greatly reduced, and maintenance cost and potential safety hazards are greatly increased.
In the aspects of design improvement and safety precise control of the corrugated pipe, testing the actual fatigue life of the corrugated pipe is important reference data, so that how to carry out a fatigue test on the corrugated pipe under a simulated actual operation environment is a research focus.
At present, the fatigue life research of the corrugated pipe is advanced on a test device and a test method, the test device and the method for testing the bending fatigue of the corrugated pipe under a heating and humid environment, the test device and the method for testing the actual fatigue life of the corrugated pipe under a high-temperature and high-pressure environment are provided, and the fatigue test device and the method for the external pressure type corrugated pipe under the conditions of heating, pressurizing and corrosion medium are also provided. However, the difference of the test processes is still existed compared with the actual operation environment of the corrugated pipe, the complex operation environment of the corrugated pipe cannot be completely simulated, and the change of alternation of dry and wet can be simulated by using the environment box to manufacture the damp and hot environment, but the pressure cannot be applied to the surface of the corrugated pipe; the corrugated pipe with the internal and external pressure forms is always soaked in a single medium under the heating and pressurizing conditions, so that the simulation of the dry-wet alternation environmental factors cannot be realized, different test conditions cannot be simulated at the internal side and the external side of the corrugated pipe, the different test conditions are different from the influence factors of the corrugated pipe in the actual operation environment, and the reference value of the design improvement and the safety precise control of the corrugated pipe is limited.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a corrosion fatigue test device for simulating an operation working condition environment, which can simulate a multi-factor medium aiming at the actual operation environment of an external pressure type corrugated pipe.
In order to realize the technical purpose, the adopted technical scheme is as follows: a corrugated pipe fatigue test device for simulating an operating environment comprises an outer pipe, an end pipe assembly, a corrugated pipe, a middle pipe, an end pipe base assembly, a first connecting pipe, a second connecting pipe, a middle plate and a pull rod assembly;
the two corrugated pipes are connected in series in the vertical direction by the middle pipe, the lower end of the corrugated pipe positioned below is connected with an end pipe base assembly, the upper end of the corrugated pipe positioned above is connected with an end pipe assembly, the corrugated pipe, the middle pipe and the end pipe base assembly enclose a vertical inner cavity with an opening at the upper part, and the vertical inner cavity is connected with a first connecting pipe for introducing a medium B;
an outer pipe is sleeved outside an assembly consisting of two corrugated pipes and a middle pipe, one end of the outer pipe is hermetically connected with an end pipe base assembly, the other end of the outer pipe is hermetically connected with an end pipe assembly, a heat insulation layer wraps the outer side of the outer pipe, the end pipe assembly, the corrugated pipes, the middle pipe, the end pipe base assembly and the outer pipe enclose an annular outer cavity located on the outer side of the corrugated pipes, a second connecting pipe used for introducing a medium A is connected onto the annular outer cavity, a needle valve is connected onto the second connecting pipe in series, and a pressure gauge connecting pipe with one end connected with a pressure gauge is connected onto the annular outer cavity;
the middle pipe is connected with a middle plate, the middle plate is provided with a through hole, one end of the pull rod assembly extends into the vertical inner cavity and is connected with the middle plate, and the other end of the pull rod assembly is used for being connected with a fatigue testing machine.
The top of the pull rod assembly and the bottom of the end pipe base assembly are provided with connecting rods used for being connected with a fatigue testing machine.
The tie rod assembly is connected with the middle plate through threads.
The pressure gauge is connected with an alarm.
The needle valve is connected with a screwed joint in series.
The first connecting pipe is connected with a threaded joint in series.
The utility model has the beneficial effects that: this device compact structure, reasonable in design can carry out the research of bellows fatigue life and law under single influence factor or multiple influence factor, carries out the simulation of multifactor medium, including high temperature high pressure, the corrosive medium that contains the ion, temperature cycle, dry and wet circulation etc. can laminate the low cycle fatigue test of external pressure type bellows actual operation environment, obtains the bellows fatigue life who accords with reality, provides the basis for the design improvement and the accurate control of security of bellows simultaneously.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a simulation state of the present invention;
in the figure: 1. the pressure gauge comprises an end pipe base assembly, 2, a middle pipe, 3, a middle plate, 4, a corrugated pipe, 5, an outer pipe, 6, a pressure gauge connecting pipe, 7, an end pipe assembly, 8, a pull rod assembly, 9, a second connecting pipe, 10, a needle valve, 11, a threaded joint, 12, a connecting rod, 13, a first connecting pipe, 14, a vertical inner cavity, 15, an annular outer cavity, 16, a heat preservation layer, 17, a pressure gauge, 18, media A, 19 and media B.
Detailed Description
The following provides a preferred embodiment of the present invention with reference to the accompanying drawings to explain the technical solutions of the present invention in detail. Here, a detailed description will be given of the present invention with reference to the accompanying drawings. It should be expressly understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to limit or restrict the present invention.
In the description of the present embodiment, the terms "inside", "outside", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely to distinguish similar items and are not to be construed as requiring a particular order or sequence, and it is to be understood that such uses are interchangeable under appropriate circumstances.
As shown in fig. 1 and 2, a bellows fatigue test device for simulating an operating environment includes an outer tube 5, an end tube assembly 7, a bellows 4, a middle tube 2, an end tube base assembly 1, a first connecting tube 13, a second connecting tube 9, a middle plate 3, and a tie rod assembly 8.
Two bellows 4 are in series connection together according to the vertical direction by intermediate tube 2, the lower extreme of the bellows 4 that is located the below is connected with end pipe base subassembly 1, end pipe base subassembly 1 is similar to a barrel-type structure, the upper end of the bellows 4 that is located the top is connected with end pipe subassembly 7, end pipe subassembly 7 comprises a straight tube and an ring pipe, end pipe subassembly 7, bellows 4, intermediate tube 2 and end pipe base subassembly 1 enclose into an upper open-ended vertical inner chamber 14, vertical inner chamber 14 will guarantee the non-leakage, be connected with the first takeover 13 that is used for letting in medium B on vertical inner chamber 14, first takeover 13 is used for being connected with the device that provides medium B, can let in medium B to vertical inner chamber 14.
The hollow space inside the bellows 4 is filled with a medium B19, and the medium B19 is used to simulate the ambient medium penetrating into the bellows through the reserved gap. Fill into corrosive solution from end pipe base subassembly 1 to bellows inside, solution concentration and liquid level height carry out nimble design according to service environment, also can add the setting that the circulating pump carries out wet-dry alternative environment, and evaporation concentration can take place for inside solution because of the temperature.
The subassembly outside cover that constitutes by intervalve 2 at two bellows 4 is equipped with outer tube 5, the one end and the 1 sealing connection of end pipe base subassembly of outer tube 5, the other end and end pipe subassembly 7 sealing connection, the connection form all adopts the welding, guarantee sealed nothing to leak, the outside parcel of outer tube 5 has heat preservation 16, cover the constancy of temperature that the heat preservation can maintain the test in-process behind the test piece surface mounting heating tape, carry out the regulation and control of temperature and pressure through the heating tape after being full of medium A, temperature and pressure can carry out the adjustment of certain limit according to actual conditions. The end pipe assembly 7, the corrugated pipe 4, the middle pipe 2, the end pipe base assembly 1 and the outer pipe 5 enclose an annular outer cavity 15 located on the outer side of the corrugated pipe 4, a second connecting pipe 9 used for introducing a medium A18 is connected to the annular outer cavity 15, a needle valve 10 is connected to the second connecting pipe 9 in series, and a pressure gauge connecting pipe 6 with one end connected with a pressure gauge 17 is further connected to the annular outer cavity 15.
The medium A is filled into the internal environment of the annular outer cavity simulation pipeline between the corrugated pipe 4 and the outer pipe 5, the medium A is used for simulating a medium flowing in the pipeline or for maintaining pressure in the pipeline, an aqueous solution or mixed gas containing high-concentration corrosive elements can be used, and flexible adjustment can be performed according to the actual flowing medium of the pipeline.
An opening at the upper part of the outer pipe 5 is connected with a pressure gauge 17 through a pressure gauge connecting pipe 6, and the pressure gauge 17 is connected with an alarm and a fatigue testing machine controller to monitor the pressure outside the corrugated pipe (omitted in the figure).
The middle pipe 2 is connected with a middle plate 3, the middle plate 3 is provided with a through hole, one end of a pull rod assembly 8 extends into the vertical inner cavity 14 and is connected with the middle plate 3, and the other end of the pull rod assembly is used for being connected with a fatigue testing machine.
Two identical corrugated pipes are selected to be connected in series for testing, normal operation in the testing process is guaranteed through the pull rod assembly 8, and a pull rod and a middle plate in the pull rod assembly are connected through threads so that displacement and replacement can be controlled conveniently. When any corrugated pipe cracks, the numerical value of the pressure gauge rapidly drops, the alarm gives an alarm, the fatigue testing machine stops testing, and the numerical value of the fatigue times is recorded.
The top of the pull rod assembly 8 and the bottom of the end pipe base assembly 1 are provided with connecting rods 12 for being connected with a fatigue testing machine. The connecting rod 12 is matched with a connecting part of the fatigue testing machine, and is convenient to mount and dismount.
The needle valve 10 is connected with a threaded joint 11 in series, and the first connecting pipe 13 is connected with the threaded joint 11 in series, so that the needle valve is conveniently connected with an external liquid supply component.
Taking the corrugated pipe expansion joint for the hot water heat supply pipeline as an example, an external pressure type corrugated pipe is commonly used in the heat supply pipeline, the outer side of the corrugated pipe is filled with pretreated hot water and keeps a certain pressure, and the inner side of the corrugated pipe is influenced by corrosion factors such as sewage, soil, microorganisms and the like which permeate from gaps. The heat supply corrugated pipe is mainly made of austenitic stainless steel, and the influence of chloride ions on the actual service life of the corrugated pipe is the most serious among various influencing factors.
In the test process, the medium A selects a heating solution with the chloride ion content of 25mg/L according to the related hot water supply standard, the test pressure and the test temperature are consistent with the design parameters of a heat supply pipeline, and the medium B prepares a solution with the same corrosion factors according to the detection result of the environmental water quality.
The outer annular outer space 15 is initially filled with the medium a from the second connecting piece 9. And a pressure gauge 17 connected with an alarm is arranged at the pressure gauge connecting pipe 6, then water is filled continuously until the water pressure reaches a preset value, and the needle valve 10 is screwed down to maintain the water pressure. And then, winding a heating belt on the outer side of the outer pipe of the test piece, setting the temperature, covering the heat preservation cotton 16 for heat preservation, and charging and discharging the medium A for regulation according to the numerical value change of the pressure gauge during heating to maintain the stable pressure.
The inner vertical chamber 14 is then filled with the medium B from the first connecting piece 13, approximately without the uppermost bellows 4. And setting the working time of the circulating pump to carry out dry-wet circulation.
And then fixing the whole testing device on a fatigue testing machine (omitted in the figure), controlling the pull rod assembly to lift by the fatigue testing machine, setting a proper cycle frequency, and calculating the displacement amplitude according to the bellows parameters and the designed fatigue times. The fatigue testing machine is connected with the computer and counts the cycle times.
When any corrugated pipe leaks, the pressure of the outer annular outer cavity 15 is reduced, an alarm connected with a pressure gauge gives an alarm when the pressure is reduced to exceed a certain amplitude, meanwhile, the alarm is connected with a computer (omitted in the figure) to control the fatigue testing machine to stop the test, and the test times counted by the computer are the actual fatigue times of the corrugated pipe in the operating environment.
The actual fatigue times of the corrugated pipe measured in the test are compared with the design fatigue times and the fatigue times of the corrugated pipe measured in the air, and the data of the corrugated pipes with different design fatigue times are analyzed and fitted, so that the influence of the operating environment on the actual fatigue performance of the corrugated pipe can be summarized.
Other conditions are controlled to be unchanged, a certain test condition, such as heating temperature, is changed, and the influence of a single factor on the actual fatigue performance of the corrugated pipe under the operating environment can be respectively researched.
The utility model can also be applied to other fields, and the technology is suitable for all expansion joints (external pressure straight pipe pressure balance type expansion joints, bypass straight pipe pressure balance type expansion joints and the like) of external pressure structures.
Claims (6)
1. The utility model provides a bellows fatigue test device of simulation operational environment which characterized in that: the corrugated pipe comprises an outer pipe (5), an end pipe assembly (7), a corrugated pipe (4), a middle pipe (2), an end pipe base assembly (1), a first connecting pipe (13), a second connecting pipe (9), a middle plate (3) and a pull rod assembly (8);
the two corrugated pipes (4) are connected in series in the vertical direction through the middle pipe (2), the lower end of the corrugated pipe (4) positioned below is connected with the end pipe base assembly (1), the upper end of the corrugated pipe (4) positioned above is connected with the end pipe assembly (7), the corrugated pipe (4), the middle pipe (2) and the end pipe base assembly (1) enclose a vertical inner cavity (14) with an opening at the upper part, and the vertical inner cavity (14) is connected with a first connecting pipe (13) for introducing a medium B;
an outer pipe (5) is sleeved on the outer side of a component formed by two corrugated pipes (4) and an intermediate pipe (2), one end of the outer pipe (5) is hermetically connected with an end pipe base component (1), the other end of the outer pipe is hermetically connected with an end pipe component (7), a heat insulation layer (16) wraps the outer side of the outer pipe (5), the end pipe component (7), the corrugated pipes (4), the intermediate pipe (2), the end pipe base component (1) and the outer pipe (5) enclose an annular outer cavity (15) located on the outer side of the corrugated pipes (4), a second connecting pipe (9) used for introducing a medium A is connected to the annular outer cavity (15), a needle valve (10) is connected to the second connecting pipe (9) in series, and a pressure gauge connecting pipe (6) with one end connected with a pressure gauge (17) is also connected to the annular outer cavity (15);
the middle pipe (2) is connected with a middle plate (3), the middle plate (3) is provided with a through hole, one end of the pull rod assembly (8) extends into the vertical inner cavity (14) and is connected with the middle plate (3), and the other end of the pull rod assembly is used for being connected with a fatigue testing machine.
2. A bellows fatigue test device for simulating an operating environment according to claim 1, wherein: the top of the pull rod assembly (8) and the bottom of the end pipe base assembly (1) are provided with connecting rods (12) used for being connected with a fatigue testing machine.
3. A bellows fatigue test device for simulating an operating environment according to claim 1, wherein: the pull rod assembly (8) is connected with the middle plate (3) through threads.
4. A bellows fatigue test device for simulating an operating environment according to claim 1, wherein: the pressure gauge is connected with an alarm.
5. A bellows fatigue test device for simulating an operating environment according to claim 1, wherein: the needle valve (10) is connected with a threaded joint (11) in series.
6. A bellows fatigue test device for simulating an operating environment according to claim 1, wherein: the first connecting pipe (13) is connected with a threaded joint (11) in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121796720.5U CN216144506U (en) | 2021-08-03 | 2021-08-03 | Bellows fatigue test device of simulation operational environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121796720.5U CN216144506U (en) | 2021-08-03 | 2021-08-03 | Bellows fatigue test device of simulation operational environment |
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| CN216144506U true CN216144506U (en) | 2022-03-29 |
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| CN202121796720.5U Active CN216144506U (en) | 2021-08-03 | 2021-08-03 | Bellows fatigue test device of simulation operational environment |
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- 2021-08-03 CN CN202121796720.5U patent/CN216144506U/en active Active
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Address after: No.88, Binhe North Road, hi tech Zone, Luoyang City, Henan Province Patentee after: CSSC Shuangrui (Luoyang) special equipment Co.,Ltd. Address before: No.88, Binhe North Road, hi tech Zone, Luoyang City, Henan Province Patentee before: LUOYANG SUNRUI SPECIAL EQUIPMENT Co.,Ltd. |